/var/lib/jenkins/workspace/firefox-scan-build/mfbt/lz4/lz4.c

Bug Summary

File:	var/lib/jenkins/workspace/firefox-scan-build/mfbt/lz4/lz4.c
Warning:	line 2185, column 21 Null pointer passed as 2nd argument to memory copy function
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name lz4.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -ffp-contract=off -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/mfbt -fcoverage-compilation-dir=/var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/mfbt -resource-dir /usr/lib/llvm-18/lib/clang/18 -include /var/lib/jenkins/workspace/firefox-scan-build/config/gcc_hidden.h -include /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/mozilla-config.h -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/system_wrappers -U _FORTIFY_SOURCE -D _FORTIFY_SOURCE=2 -D DEBUG=1 -D IMPL_MFBT -D LZ4LIB_VISIBILITY= -D MOZ_SUPPORT_LEAKCHECKING -I /var/lib/jenkins/workspace/firefox-scan-build/mfbt -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/mfbt -I /var/lib/jenkins/workspace/firefox-scan-build/mfbt/double-conversion -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include/nspr -I /var/lib/jenkins/workspace/firefox-scan-build/obj-x86_64-pc-linux-gnu/dist/include/nss -D MOZILLA_CLIENT -internal-isystem /usr/lib/llvm-18/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-error=tautological-type-limit-compare -Wno-range-loop-analysis -Wno-error=deprecated-declarations -Wno-error=array-bounds -Wno-error=free-nonheap-object -Wno-error=atomic-alignment -Wno-error=deprecated-builtins -Wno-psabi -Wno-error=builtin-macro-redefined -Wno-unknown-warning-option -std=gnu99 -ferror-limit 19 -stack-protector 2 -fstack-clash-protection -ftrivial-auto-var-init=pattern -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2024-07-30-004816-4182763-1 -x c /var/lib/jenkins/workspace/firefox-scan-build/mfbt/lz4/lz4.c
1/*
 LZ4 - Fast LZ compression algorithm
 Copyright (C) 2011-2023, Yann Collet.

 BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:

     * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 You can contact the author at :
  - LZ4 homepage : http://www.lz4.org
  - LZ4 source repository : https://github.com/lz4/lz4
33*/

35/*-************************************
36*  Tuning parameters
37**************************************/
38/*
* LZ4_HEAPMODE :
* Select how stateless compression functions like `LZ4_compress_default()`
* allocate memory for their hash table,
* in memory stack (0:default, fastest), or in memory heap (1:requires malloc()).
*/
44#ifndef LZ4_HEAPMODE0
45#  define LZ4_HEAPMODE0 0
46#endif

48/*
* LZ4_ACCELERATION_DEFAULT :
* Select "acceleration" for LZ4_compress_fast() when parameter value <= 0
*/
52#define LZ4_ACCELERATION_DEFAULT1 1
53/*
* LZ4_ACCELERATION_MAX :
* Any "acceleration" value higher than this threshold
* get treated as LZ4_ACCELERATION_MAX instead (fix #876)
*/
58#define LZ4_ACCELERATION_MAX65537 65537


61/*-************************************
62*  CPU Feature Detection
63**************************************/
64/* LZ4_FORCE_MEMORY_ACCESS
* By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable.
* Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal.
* The below switch allow to select different access method for improved performance.
* Method 0 (default) : use `memcpy()`. Safe and portable.
* Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable).
*            This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`.
* Method 2 : direct access. This method is portable but violate C standard.
*            It can generate buggy code on targets which assembly generation depends on alignment.
*            But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)
* See https://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details.
* Prefer these methods in priority order (0 > 1 > 2)
*/
77#ifndef LZ4_FORCE_MEMORY_ACCESS1   /* can be defined externally */
78#  if defined(__GNUC__4) && \
( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) \
|| defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) )
81#    define LZ4_FORCE_MEMORY_ACCESS1 2
82#  elif (defined(__INTEL_COMPILER) && !defined(_WIN32)) || defined(__GNUC__4) || defined(_MSC_VER)
83#    define LZ4_FORCE_MEMORY_ACCESS1 1
84#  endif
85#endif

87/*
* LZ4_FORCE_SW_BITCOUNT
* Define this parameter if your target system or compiler does not support hardware bit count
*/
91#if defined(_MSC_VER) && defined(_WIN32_WCE)   /* Visual Studio for WinCE doesn't support Hardware bit count */
92#  undef  LZ4_FORCE_SW_BITCOUNT  /* avoid double def */
93#  define LZ4_FORCE_SW_BITCOUNT
94#endif



98/*-************************************
99*  Dependency
100**************************************/
101/*
* LZ4_SRC_INCLUDED:
* Amalgamation flag, whether lz4.c is included
*/
105#ifndef LZ4_SRC_INCLUDED1
106#  define LZ4_SRC_INCLUDED1 1
107#endif

109#ifndef LZ4_DISABLE_DEPRECATE_WARNINGS
110#  define LZ4_DISABLE_DEPRECATE_WARNINGS /* due to LZ4_decompress_safe_withPrefix64k */
111#endif

113#ifndef LZ4_STATIC_LINKING_ONLY
114#  define LZ4_STATIC_LINKING_ONLY
115#endif
116#include "lz4.h"
117/* see also "memory routines" below */


120/*-************************************
121*  Compiler Options
122**************************************/
123#if defined(_MSC_VER) && (_MSC_VER >= 1400)  /* Visual Studio 2005+ */
124#  include <intrin.h>               /* only present in VS2005+ */
125#  pragma warning(disable : 4127)   /* disable: C4127: conditional expression is constant */
126#  pragma warning(disable : 6237)   /* disable: C6237: conditional expression is always 0 */
127#  pragma warning(disable : 6239)   /* disable: C6239: (<non-zero constant> && <expression>) always evaluates to the result of <expression> */
128#  pragma warning(disable : 6240)   /* disable: C6240: (<expression> && <non-zero constant>) always evaluates to the result of <expression> */
129#  pragma warning(disable : 6326)   /* disable: C6326: Potential comparison of a constant with another constant */
130#endif  /* _MSC_VER */

132#ifndef LZ4_FORCE_INLINEstatic inline __attribute__((always_inline))
133#  if defined (_MSC_VER) && !defined (__clang__1)    /* MSVC */
134#    define LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) static __forceinline
135#  else
136#    if defined (__cplusplus) || defined (__STDC_VERSION__199901L) && __STDC_VERSION__199901L >= 199901L   /* C99 */
137#      if defined (__GNUC__4) || defined (__clang__1)
138#        define LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) static inline __attribute__((always_inline))
139#      else
140#        define LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) static inline
141#      endif
142#    else
143#      define LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) static
144#    endif /* __STDC_VERSION__ */
145#  endif  /* _MSC_VER */
146#endif /* LZ4_FORCE_INLINE */

148/* LZ4_FORCE_O2 and LZ4_FORCE_INLINE
* gcc on ppc64le generates an unrolled SIMDized loop for LZ4_wildCopy8,
* together with a simple 8-byte copy loop as a fall-back path.
* However, this optimization hurts the decompression speed by >30%,
* because the execution does not go to the optimized loop
* for typical compressible data, and all of the preamble checks
* before going to the fall-back path become useless overhead.
* This optimization happens only with the -O3 flag, and -O2 generates
* a simple 8-byte copy loop.
* With gcc on ppc64le, all of the LZ4_decompress_* and LZ4_wildCopy8
* functions are annotated with __attribute__((optimize("O2"))),
* and also LZ4_wildCopy8 is forcibly inlined, so that the O2 attribute
* of LZ4_wildCopy8 does not affect the compression speed.
*/
162#if defined(__PPC64__) && defined(__LITTLE_ENDIAN__1) && defined(__GNUC__4) && !defined(__clang__1)
163#  define LZ4_FORCE_O2  __attribute__((optimize("O2")))
164#  undef LZ4_FORCE_INLINEstatic inline __attribute__((always_inline))
165#  define LZ4_FORCE_INLINEstatic inline __attribute__((always_inline))  static __inline __attribute__((optimize("O2"),always_inline))
166#else
167#  define LZ4_FORCE_O2
168#endif

170#if (defined(__GNUC__4) && (__GNUC__4 >= 3)) || (defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 800)) || defined(__clang__1)
171#  define expect(expr,value)(__builtin_expect ((expr),(value)) )    (__builtin_expect ((expr),(value)) )
172#else
173#  define expect(expr,value)(__builtin_expect ((expr),(value)) )    (expr)
174#endif

176#ifndef likely
177#define likely(expr)(__builtin_expect (((expr) != 0),(1)) )     expect((expr) != 0, 1)(__builtin_expect (((expr) != 0),(1)) )
178#endif
179#ifndef unlikely
180#define unlikely(expr)(__builtin_expect (((expr) != 0),(0)) )   expect((expr) != 0, 0)(__builtin_expect (((expr) != 0),(0)) )
181#endif

183/* Should the alignment test prove unreliable, for some reason,
* it can be disabled by setting LZ4_ALIGN_TEST to 0 */
185#ifndef LZ4_ALIGN_TEST1  /* can be externally provided */
186# define LZ4_ALIGN_TEST1 1
187#endif


190/*-************************************
191*  Memory routines
192**************************************/

194/*! LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION :
*  Disable relatively high-level LZ4/HC functions that use dynamic memory
*  allocation functions (malloc(), calloc(), free()).
*
*  Note that this is a compile-time switch. And since it disables
*  public/stable LZ4 v1 API functions, we don't recommend using this
*  symbol to generate a library for distribution.
*
*  The following public functions are removed when this symbol is defined.
*  - lz4   : LZ4_createStream, LZ4_freeStream,
*            LZ4_createStreamDecode, LZ4_freeStreamDecode, LZ4_create (deprecated)
*  - lz4hc : LZ4_createStreamHC, LZ4_freeStreamHC,
*            LZ4_createHC (deprecated), LZ4_freeHC  (deprecated)
*  - lz4frame, lz4file : All LZ4F_* functions
*/
209#if defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
210#  define ALLOC(s)malloc(s)          lz4_error_memory_allocation_is_disabled
211#  define ALLOC_AND_ZERO(s)calloc(1,s) lz4_error_memory_allocation_is_disabled
212#  define FREEMEM(p)free(p)        lz4_error_memory_allocation_is_disabled
213#elif defined(LZ4_USER_MEMORY_FUNCTIONS)
214/* memory management functions can be customized by user project.
* Below functions must exist somewhere in the Project
* and be available at link time */
217void* LZ4_malloc(size_t s);
218void* LZ4_calloc(size_t n, size_t s);
219void  LZ4_free(void* p);
220# define ALLOC(s)malloc(s)          LZ4_malloc(s)
221# define ALLOC_AND_ZERO(s)calloc(1,s) LZ4_calloc(1,s)
222# define FREEMEM(p)free(p)        LZ4_free(p)
223#else
224# include <stdlib.h>   /* malloc, calloc, free */
225# define ALLOC(s)malloc(s)          malloc(s)
226# define ALLOC_AND_ZERO(s)calloc(1,s) calloc(1,s)
227# define FREEMEM(p)free(p)        free(p)
228#endif

230#if ! LZ4_FREESTANDING0
231#  include <string.h>   /* memset, memcpy */
232#endif
233#if !defined(LZ4_memset)
234#  define LZ4_memset(p,v,s)memset((p),(v),(s)) memset((p),(v),(s))
235#endif
236#define MEM_INIT(p,v,s)memset(((p)),((v)),((s)))   LZ4_memset((p),(v),(s))memset(((p)),((v)),((s)))


239/*-************************************
240*  Common Constants
241**************************************/
242#define MINMATCH4 4

244#define WILDCOPYLENGTH8 8
245#define LASTLITERALS5   5   /* see ../doc/lz4_Block_format.md#parsing-restrictions */
246#define MFLIMIT12       12   /* see ../doc/lz4_Block_format.md#parsing-restrictions */
247#define MATCH_SAFEGUARD_DISTANCE((2*8) - 4)  ((2*WILDCOPYLENGTH8) - MINMATCH4)   /* ensure it's possible to write 2 x wildcopyLength without overflowing output buffer */
248#define FASTLOOP_SAFE_DISTANCE64 64
249static const int LZ4_minLength = (MFLIMIT12+1);

251#define KB*(1 <<10) *(1 <<10)
252#define MB*(1 <<20) *(1 <<20)
253#define GB*(1U<<30) *(1U<<30)

255#define LZ4_DISTANCE_ABSOLUTE_MAX65535 65535
256#if (LZ4_DISTANCE_MAX65535 > LZ4_DISTANCE_ABSOLUTE_MAX65535)   /* max supported by LZ4 format */
257#  error "LZ4_DISTANCE_MAX is too big : must be <= 65535"
258#endif

260#define ML_BITS4  4
261#define ML_MASK((1U<<4)-1)  ((1U<<ML_BITS4)-1)
262#define RUN_BITS(8-4) (8-ML_BITS4)
263#define RUN_MASK((1U<<(8-4))-1) ((1U<<RUN_BITS(8-4))-1)


266/*-************************************
267*  Error detection
268**************************************/
269#if defined(LZ4_DEBUG) && (LZ4_DEBUG>=1)
270#  include <assert.h>
271#else
272#  ifndef assert
273#    define assert(condition)((void)0) ((void)0)
274#  endif
275#endif

277#define LZ4_STATIC_ASSERT(c){ enum { LZ4_static_assert = 1/(int)(!!(c)) }; }   { enum { LZ4_static_assert = 1/(int)(!!(c)) }; }   /* use after variable declarations */

279#if defined(LZ4_DEBUG) && (LZ4_DEBUG>=2)
280#  include <stdio.h>
 static int g_debuglog_enable = 1;
282#  define DEBUGLOG(l, ...){} {                          \
      if ((g_debuglog_enable) && (l<=LZ4_DEBUG)) {  \
          fprintf(stderr, __FILE__"/var/lib/jenkins/workspace/firefox-scan-build/mfbt/lz4/lz4.c"  " %i: ", __LINE__284); \
          fprintf(stderr, __VA_ARGS__);             \
          fprintf(stderr, " \n");                   \
  }   }
288#else
289#  define DEBUGLOG(l, ...){} {}    /* disabled */
290#endif

292static int LZ4_isAligned(const void* ptr, size_t alignment)
293{
  return ((size_t)ptr & (alignment -1)) == 0;
295}


298/*-************************************
299*  Types
300**************************************/
301#include <limits.h>
302#if defined(__cplusplus) || (defined (__STDC_VERSION__199901L) && (__STDC_VERSION__199901L >= 199901L) /* C99 */)
303# include <stdint.h>
typedef  uint8_t BYTE;
typedef uint16_t U16;
typedef uint32_t U32;
typedef  int32_t S32;
typedef uint64_t U64;
typedef uintptr_t uptrval;
310#else
311# if UINT_MAX(2147483647 *2U +1U) != 4294967295UL
312#   error "LZ4 code (when not C++ or C99) assumes that sizeof(int) == 4"
313# endif
typedef unsigned char       BYTE;
typedef unsigned short      U16;
typedef unsigned int        U32;
typedef   signed int        S32;
typedef unsigned long long  U64;
typedef size_t              uptrval;   /* generally true, except OpenVMS-64 */
320#endif

322#if defined(__x86_64__1)
typedef U64    reg_t;   /* 64-bits in x32 mode */
324#else
typedef size_t reg_t;   /* 32-bits in x32 mode */
326#endif

328typedef enum {
  notLimited = 0,
  limitedOutput = 1,
  fillOutput = 2
332} limitedOutput_directive;


335/*-************************************
336*  Reading and writing into memory
337**************************************/

339/**
* LZ4 relies on memcpy with a constant size being inlined. In freestanding
* environments, the compiler can't assume the implementation of memcpy() is
* standard compliant, so it can't apply its specialized memcpy() inlining
* logic. When possible, use __builtin_memcpy() to tell the compiler to analyze
* memcpy() as if it were standard compliant, so it can inline it in freestanding
* environments. This is needed when decompressing the Linux Kernel, for example.
*/
347#if !defined(LZ4_memcpy)
348#  if defined(__GNUC__4) && (__GNUC__4 >= 4)
349#    define LZ4_memcpy(dst, src, size)__builtin_memcpy(dst, src, size) __builtin_memcpy(dst, src, size)
350#  else
351#    define LZ4_memcpy(dst, src, size)__builtin_memcpy(dst, src, size) memcpy(dst, src, size)
352#  endif
353#endif

355#if !defined(LZ4_memmove__builtin_memmove)
356#  if defined(__GNUC__4) && (__GNUC__4 >= 4)
357#    define LZ4_memmove__builtin_memmove __builtin_memmove
358#  else
359#    define LZ4_memmove__builtin_memmove memmove
360#  endif
361#endif

363static unsigned LZ4_isLittleEndian(void)
364{
  const union { U32 u; BYTE c[4]; } one = { 1 };   /* don't use static : performance detrimental */
  return one.c[0];
367}

369#if defined(__GNUC__4) || defined(__INTEL_COMPILER)
370#define LZ4_PACK( __Declaration__ )__Declaration__ __attribute__((__packed__)) __Declaration__ __attribute__((__packed__))
371#elif defined(_MSC_VER)
372#define LZ4_PACK( __Declaration__ )__Declaration__ __attribute__((__packed__)) __pragma( pack(push, 1) ) __Declaration__ __pragma( pack(pop))
373#endif

375#if defined(LZ4_FORCE_MEMORY_ACCESS1) && (LZ4_FORCE_MEMORY_ACCESS1==2)
376/* lie to the compiler about data alignment; use with caution */

378static U16 LZ4_read16(const void* memPtr) { return *(const U16*) memPtr; }
379static U32 LZ4_read32(const void* memPtr) { return *(const U32*) memPtr; }
380static reg_t LZ4_read_ARCH(const void* memPtr) { return *(const reg_t*) memPtr; }

382static void LZ4_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; }
383static void LZ4_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; }

385#elif defined(LZ4_FORCE_MEMORY_ACCESS1) && (LZ4_FORCE_MEMORY_ACCESS1==1)

387/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */
388/* currently only defined for gcc and icc */
389LZ4_PACK(typedef struct { U16 u16; })typedef struct { U16 u16; } __attribute__((__packed__)) LZ4_unalign16;
390LZ4_PACK(typedef struct { U32 u32; })typedef struct { U32 u32; } __attribute__((__packed__)) LZ4_unalign32;
391LZ4_PACK(typedef struct { reg_t uArch; })typedef struct { reg_t uArch; } __attribute__((__packed__)) LZ4_unalignST;

393static U16 LZ4_read16(const void* ptr) { return ((const LZ4_unalign16*)ptr)->u16; }
394static U32 LZ4_read32(const void* ptr) { return ((const LZ4_unalign32*)ptr)->u32; }
395static reg_t LZ4_read_ARCH(const void* ptr) { return ((const LZ4_unalignST*)ptr)->uArch; }

397static void LZ4_write16(void* memPtr, U16 value) { ((LZ4_unalign16*)memPtr)->u16 = value; }
398static void LZ4_write32(void* memPtr, U32 value) { ((LZ4_unalign32*)memPtr)->u32 = value; }

400#else  /* safe and portable access using memcpy() */

402static U16 LZ4_read16(const void* memPtr)
403{
  U16 val; LZ4_memcpy(&val, memPtr, sizeof(val))__builtin_memcpy(&val, memPtr, sizeof(val)); return val;
405}

407static U32 LZ4_read32(const void* memPtr)
408{
  U32 val; LZ4_memcpy(&val, memPtr, sizeof(val))__builtin_memcpy(&val, memPtr, sizeof(val)); return val;
410}

412static reg_t LZ4_read_ARCH(const void* memPtr)
413{
  reg_t val; LZ4_memcpy(&val, memPtr, sizeof(val))__builtin_memcpy(&val, memPtr, sizeof(val)); return val;
415}

417static void LZ4_write16(void* memPtr, U16 value)
418{
  LZ4_memcpy(memPtr, &value, sizeof(value))__builtin_memcpy(memPtr, &value, sizeof(value));
420}

422static void LZ4_write32(void* memPtr, U32 value)
423{
  LZ4_memcpy(memPtr, &value, sizeof(value))__builtin_memcpy(memPtr, &value, sizeof(value));
425}

427#endif /* LZ4_FORCE_MEMORY_ACCESS */


430static U16 LZ4_readLE16(const void* memPtr)
431{
  if (LZ4_isLittleEndian()) {
      return LZ4_read16(memPtr);
  } else {
      const BYTE* p = (const BYTE*)memPtr;
      return (U16)((U16)p[0] | (p[1]<<8));
  }
438}

440#ifdef LZ4_STATIC_LINKING_ONLY_ENDIANNESS_INDEPENDENT_OUTPUT
441static U32 LZ4_readLE32(const void* memPtr)
442{
  if (LZ4_isLittleEndian()) {
      return LZ4_read32(memPtr);
  } else {
      const BYTE* p = (const BYTE*)memPtr;
      return (U32)p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
  }
449}
450#endif

452static void LZ4_writeLE16(void* memPtr, U16 value)
453{
  if (LZ4_isLittleEndian()) {
      LZ4_write16(memPtr, value);
  } else {
      BYTE* p = (BYTE*)memPtr;
      p[0] = (BYTE) value;
      p[1] = (BYTE)(value>>8);
  }
461}

463/* customized variant of memcpy, which can overwrite up to 8 bytes beyond dstEnd */
464LZ4_FORCE_INLINEstatic inline __attribute__((always_inline))
465void LZ4_wildCopy8(void* dstPtr, const void* srcPtr, void* dstEnd)
466{
  BYTE* d = (BYTE*)dstPtr;
  const BYTE* s = (const BYTE*)srcPtr;
  BYTE* const e = (BYTE*)dstEnd;

  do { LZ4_memcpy(d,s,8)__builtin_memcpy(d, s, 8); d+=8; s+=8; } while (d<e);
472}

474static const unsigned inc32table[8] = {0, 1, 2,  1,  0,  4, 4, 4};
475static const int      dec64table[8] = {0, 0, 0, -1, -4,  1, 2, 3};


478#ifndef LZ4_FAST_DEC_LOOP1
479#  if defined __i386__ || defined _M_IX86 || defined __x86_64__1 || defined _M_X64
480#    define LZ4_FAST_DEC_LOOP1 1
481#  elif defined(__aarch64__) && defined(__APPLE__)
482#    define LZ4_FAST_DEC_LOOP1 1
483#  elif defined(__aarch64__) && !defined(__clang__1)
   /* On non-Apple aarch64, we disable this optimization for clang because
    * on certain mobile chipsets, performance is reduced with clang. For
    * more information refer to https://github.com/lz4/lz4/pull/707 */
487#    define LZ4_FAST_DEC_LOOP1 1
488#  else
489#    define LZ4_FAST_DEC_LOOP1 0
490#  endif
491#endif

493#if LZ4_FAST_DEC_LOOP1

495LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void
496LZ4_memcpy_using_offset_base(BYTE* dstPtr, const BYTE* srcPtr, BYTE* dstEnd, const size_t offset)
497{
  assert(srcPtr + offset == dstPtr)((void)0);
  if (offset < 8) {
      LZ4_write32(dstPtr, 0);   /* silence an msan warning when offset==0 */
      dstPtr[0] = srcPtr[0];
      dstPtr[1] = srcPtr[1];
      dstPtr[2] = srcPtr[2];
      dstPtr[3] = srcPtr[3];
      srcPtr += inc32table[offset];
      LZ4_memcpy(dstPtr+4, srcPtr, 4)__builtin_memcpy(dstPtr+4, srcPtr, 4);
      srcPtr -= dec64table[offset];
      dstPtr += 8;
  } else {
      LZ4_memcpy(dstPtr, srcPtr, 8)__builtin_memcpy(dstPtr, srcPtr, 8);
      dstPtr += 8;
      srcPtr += 8;
  }

  LZ4_wildCopy8(dstPtr, srcPtr, dstEnd);
516}

518/* customized variant of memcpy, which can overwrite up to 32 bytes beyond dstEnd
* this version copies two times 16 bytes (instead of one time 32 bytes)
* because it must be compatible with offsets >= 16. */
521LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void
522LZ4_wildCopy32(void* dstPtr, const void* srcPtr, void* dstEnd)
523{
  BYTE* d = (BYTE*)dstPtr;
  const BYTE* s = (const BYTE*)srcPtr;
  BYTE* const e = (BYTE*)dstEnd;

  do { LZ4_memcpy(d,s,16)__builtin_memcpy(d, s, 16); LZ4_memcpy(d+16,s+16,16)__builtin_memcpy(d+16, s+16, 16); d+=32; s+=32; } while (d<e);
529}

531/* LZ4_memcpy_using_offset()  presumes :
* - dstEnd >= dstPtr + MINMATCH
* - there is at least 12 bytes available to write after dstEnd */
534LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void
535LZ4_memcpy_using_offset(BYTE* dstPtr, const BYTE* srcPtr, BYTE* dstEnd, const size_t offset)
536{
  BYTE v[8];

  assert(dstEnd >= dstPtr + MINMATCH)((void)0);

  switch(offset) {
  case 1:
      MEM_INIT(v, *srcPtr, 8)memset(((v)),((*srcPtr)),((8)));
      break;
  case 2:
      LZ4_memcpy(v, srcPtr, 2)__builtin_memcpy(v, srcPtr, 2);
      LZ4_memcpy(&v[2], srcPtr, 2)__builtin_memcpy(&v[2], srcPtr, 2);
548#if defined(_MSC_VER) && (_MSC_VER <= 1937) /* MSVC 2022 ver 17.7 or earlier */
549#  pragma warning(push)
550#  pragma warning(disable : 6385) /* warning C6385: Reading invalid data from 'v'. */
551#endif
      LZ4_memcpy(&v[4], v, 4)__builtin_memcpy(&v[4], v, 4);
553#if defined(_MSC_VER) && (_MSC_VER <= 1937) /* MSVC 2022 ver 17.7 or earlier */
554#  pragma warning(pop)
555#endif
      break;
  case 4:
      LZ4_memcpy(v, srcPtr, 4)__builtin_memcpy(v, srcPtr, 4);
      LZ4_memcpy(&v[4], srcPtr, 4)__builtin_memcpy(&v[4], srcPtr, 4);
      break;
  default:
      LZ4_memcpy_using_offset_base(dstPtr, srcPtr, dstEnd, offset);
      return;
  }

  LZ4_memcpy(dstPtr, v, 8)__builtin_memcpy(dstPtr, v, 8);
  dstPtr += 8;
  while (dstPtr < dstEnd) {
      LZ4_memcpy(dstPtr, v, 8)__builtin_memcpy(dstPtr, v, 8);
      dstPtr += 8;
  }
572}
573#endif


576/*-************************************
577*  Common functions
578**************************************/
579static unsigned LZ4_NbCommonBytes (reg_t val)
580{
  assert(val != 0)((void)0);
  if (LZ4_isLittleEndian()) {
      if (sizeof(val) == 8) {
584#       if defined(_MSC_VER) && (_MSC_VER >= 1800) && (defined(_M_AMD64) && !defined(_M_ARM64EC)) && !defined(LZ4_FORCE_SW_BITCOUNT)
585/*-*************************************************************************************************
586* ARM64EC is a Microsoft-designed ARM64 ABI compatible with AMD64 applications on ARM64 Windows 11.
587* The ARM64EC ABI does not support AVX/AVX2/AVX512 instructions, nor their relevant intrinsics
588* including _tzcnt_u64. Therefore, we need to neuter the _tzcnt_u64 code path for ARM64EC.
589****************************************************************************************************/
590#         if defined(__clang__1) && (__clang_major__18 < 10)
          /* Avoid undefined clang-cl intrinsics issue.
           * See https://github.com/lz4/lz4/pull/1017 for details. */
          return (unsigned)__builtin_ia32_tzcnt_u64(val) >> 3;
594#         else
          /* x64 CPUS without BMI support interpret `TZCNT` as `REP BSF` */
          return (unsigned)_tzcnt_u64(val) >> 3;
597#         endif
598#       elif defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
          unsigned long r = 0;
          _BitScanForward64(&r, (U64)val);
          return (unsigned)r >> 3;
602#       elif (defined(__clang__1) || (defined(__GNUC__4) && ((__GNUC__4 > 3) || \
                          ((__GNUC__4 == 3) && (__GNUC_MINOR__2 >= 4))))) && \
                                      !defined(LZ4_FORCE_SW_BITCOUNT)
          return (unsigned)__builtin_ctzll((U64)val) >> 3;
606#       else
          const U64 m = 0x0101010101010101ULL;
          val ^= val - 1;
          return (unsigned)(((U64)((val & (m - 1)) * m)) >> 56);
610#       endif
      } else /* 32 bits */ {
612#       if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(LZ4_FORCE_SW_BITCOUNT)
          unsigned long r;
          _BitScanForward(&r, (U32)val);
          return (unsigned)r >> 3;
616#       elif (defined(__clang__1) || (defined(__GNUC__4) && ((__GNUC__4 > 3) || \
                          ((__GNUC__4 == 3) && (__GNUC_MINOR__2 >= 4))))) && \
                      !defined(__TINYC__) && !defined(LZ4_FORCE_SW_BITCOUNT)
          return (unsigned)__builtin_ctz((U32)val) >> 3;
620#       else
          const U32 m = 0x01010101;
          return (unsigned)((((val - 1) ^ val) & (m - 1)) * m) >> 24;
623#       endif
      }
  } else   /* Big Endian CPU */ {
      if (sizeof(val)==8) {
627#       if (defined(__clang__1) || (defined(__GNUC__4) && ((__GNUC__4 > 3) || \
                          ((__GNUC__4 == 3) && (__GNUC_MINOR__2 >= 4))))) && \
                      !defined(__TINYC__) && !defined(LZ4_FORCE_SW_BITCOUNT)
          return (unsigned)__builtin_clzll((U64)val) >> 3;
631#       else
632#if 1
          /* this method is probably faster,
           * but adds a 128 bytes lookup table */
          static const unsigned char ctz7_tab[128] = {
              7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
              4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
          };
          U64 const mask = 0x0101010101010101ULL;
          U64 const t = (((val >> 8) - mask) | val) & mask;
          return ctz7_tab[(t * 0x0080402010080402ULL) >> 57];
648#else
          /* this method doesn't consume memory space like the previous one,
           * but it contains several branches,
           * that may end up slowing execution */
          static const U32 by32 = sizeof(val)*4;  /* 32 on 64 bits (goal), 16 on 32 bits.
          Just to avoid some static analyzer complaining about shift by 32 on 32-bits target.
          Note that this code path is never triggered in 32-bits mode. */
          unsigned r;
          if (!(val>>by32)) { r=4; } else { r=0; val>>=by32; }
          if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
          r += (!val);
          return r;
660#endif
661#       endif
      } else /* 32 bits */ {
663#       if (defined(__clang__1) || (defined(__GNUC__4) && ((__GNUC__4 > 3) || \
                          ((__GNUC__4 == 3) && (__GNUC_MINOR__2 >= 4))))) && \
                                      !defined(LZ4_FORCE_SW_BITCOUNT)
          return (unsigned)__builtin_clz((U32)val) >> 3;
667#       else
          val >>= 8;
          val = ((((val + 0x00FFFF00) | 0x00FFFFFF) + val) |
            (val + 0x00FF0000)) >> 24;
          return (unsigned)val ^ 3;
672#       endif
      }
  }
675}


678#define STEPSIZEsizeof(reg_t) sizeof(reg_t)
679LZ4_FORCE_INLINEstatic inline __attribute__((always_inline))
680unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
681{
  const BYTE* const pStart = pIn;

  if (likely(pIn < pInLimit-(STEPSIZE-1))(__builtin_expect (((pIn < pInLimit-(sizeof(reg_t)-1)) != 0
),(1)) )) {
      reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
      if (!diff) {
          pIn+=STEPSIZEsizeof(reg_t); pMatch+=STEPSIZEsizeof(reg_t);
      } else {
          return LZ4_NbCommonBytes(diff);
  }   }

  while (likely(pIn < pInLimit-(STEPSIZE-1))(__builtin_expect (((pIn < pInLimit-(sizeof(reg_t)-1)) != 0
),(1)) )) {
      reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
      if (!diff) { pIn+=STEPSIZEsizeof(reg_t); pMatch+=STEPSIZEsizeof(reg_t); continue; }
      pIn += LZ4_NbCommonBytes(diff);
      return (unsigned)(pIn - pStart);
  }

  if ((STEPSIZEsizeof(reg_t)==8) && (pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; }
  if ((pIn<(pInLimit-1)) && (LZ4_read16(pMatch) == LZ4_read16(pIn))) { pIn+=2; pMatch+=2; }
  if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
  return (unsigned)(pIn - pStart);
703}


706#ifndef LZ4_COMMONDEFS_ONLY
707/*-************************************
708*  Local Constants
709**************************************/
710static const int LZ4_64Klimit = ((64 KB*(1 <<10)) + (MFLIMIT12-1));
711static const U32 LZ4_skipTrigger = 6;  /* Increase this value ==> compression run slower on incompressible data */


714/*-************************************
715*  Local Structures and types
716**************************************/
717typedef enum { clearedTable = 0, byPtr, byU32, byU16 } tableType_t;

719/**
* This enum distinguishes several different modes of accessing previous
* content in the stream.
*
* - noDict        : There is no preceding content.
* - withPrefix64k : Table entries up to ctx->dictSize before the current blob
*                   blob being compressed are valid and refer to the preceding
*                   content (of length ctx->dictSize), which is available
*                   contiguously preceding in memory the content currently
*                   being compressed.
* - usingExtDict  : Like withPrefix64k, but the preceding content is somewhere
*                   else in memory, starting at ctx->dictionary with length
*                   ctx->dictSize.
* - usingDictCtx  : Everything concerning the preceding content is
*                   in a separate context, pointed to by ctx->dictCtx.
*                   ctx->dictionary, ctx->dictSize, and table entries
*                   in the current context that refer to positions
*                   preceding the beginning of the current compression are
*                   ignored. Instead, ctx->dictCtx->dictionary and ctx->dictCtx
*                   ->dictSize describe the location and size of the preceding
*                   content, and matches are found by looking in the ctx
*                   ->dictCtx->hashTable.
*/
742typedef enum { noDict = 0, withPrefix64k, usingExtDict, usingDictCtx } dict_directive;
743typedef enum { noDictIssue = 0, dictSmall } dictIssue_directive;


746/*-************************************
747*  Local Utils
748**************************************/
749int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER(1 *100*100 + 10 *100 + 0); }
750const char* LZ4_versionString(void) { return LZ4_VERSION_STRING"1.10.0"; }
751int LZ4_compressBound(int isize)  { return LZ4_COMPRESSBOUND(isize)((unsigned)(isize) > (unsigned)0x7E000000 ? 0 : (isize) + (
(isize)/255) + 16); }
752int LZ4_sizeofState(void) { return sizeof(LZ4_stream_t); }


755/*-****************************************
756*  Internal Definitions, used only in Tests
757*******************************************/
758#if defined (__cplusplus)
759extern "C" {
760#endif

762int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int srcSize);

764int LZ4_decompress_safe_forceExtDict(const char* source, char* dest,
                                   int compressedSize, int maxOutputSize,
                                   const void* dictStart, size_t dictSize);
767int LZ4_decompress_safe_partial_forceExtDict(const char* source, char* dest,
                                   int compressedSize, int targetOutputSize, int dstCapacity,
                                   const void* dictStart, size_t dictSize);
770#if defined (__cplusplus)
771}
772#endif

774/*-******************************
775*  Compression functions
776********************************/
777LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) U32 LZ4_hash4(U32 sequence, tableType_t const tableType)
778{
  if (tableType == byU16)
      return ((sequence * 2654435761U) >> ((MINMATCH4*8)-(LZ4_HASHLOG(14 -2)+1)));
  else
      return ((sequence * 2654435761U) >> ((MINMATCH4*8)-LZ4_HASHLOG(14 -2)));
783}

785LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) U32 LZ4_hash5(U64 sequence, tableType_t const tableType)
786{
  const U32 hashLog = (tableType == byU16) ? LZ4_HASHLOG(14 -2)+1 : LZ4_HASHLOG(14 -2);
  if (LZ4_isLittleEndian()) {
      const U64 prime5bytes = 889523592379ULL;
      return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog));
  } else {
      const U64 prime8bytes = 11400714785074694791ULL;
      return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog));
  }
795}

797LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) U32 LZ4_hashPosition(const void* const p, tableType_t const tableType)
798{
  if ((sizeof(reg_t)==8) && (tableType != byU16)) return LZ4_hash5(LZ4_read_ARCH(p), tableType);

801#ifdef LZ4_STATIC_LINKING_ONLY_ENDIANNESS_INDEPENDENT_OUTPUT
  return LZ4_hash4(LZ4_readLE32(p), tableType);
803#else
  return LZ4_hash4(LZ4_read32(p), tableType);
805#endif
806}

808LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void LZ4_clearHash(U32 h, void* tableBase, tableType_t const tableType)
809{
  switch (tableType)
  {
  default: /* fallthrough */
  case clearedTable: { /* illegal! */ assert(0)((void)0); return; }
  case byPtr: { const BYTE** hashTable = (const BYTE**)tableBase; hashTable[h] = NULL((void*)0); return; }
  case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = 0; return; }
  case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = 0; return; }
  }
818}

820LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void LZ4_putIndexOnHash(U32 idx, U32 h, void* tableBase, tableType_t const tableType)
821{
  switch (tableType)
  {
  default: /* fallthrough */
  case clearedTable: /* fallthrough */
  case byPtr: { /* illegal! */ assert(0)((void)0); return; }
  case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = idx; return; }
  case byU16: { U16* hashTable = (U16*) tableBase; assert(idx < 65536)((void)0); hashTable[h] = (U16)idx; return; }
  }
830}

832/* LZ4_putPosition*() : only used in byPtr mode */
833LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void LZ4_putPositionOnHash(const BYTE* p, U32 h,
                                void* tableBase, tableType_t const tableType)
835{
  const BYTE** const hashTable = (const BYTE**)tableBase;
  assert(tableType == byPtr)((void)0); (void)tableType;
  hashTable[h] = p;
839}

841LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType)
842{
  U32 const h = LZ4_hashPosition(p, tableType);
  LZ4_putPositionOnHash(p, h, tableBase, tableType);
845}

847/* LZ4_getIndexOnHash() :
* Index of match position registered in hash table.
* hash position must be calculated by using base+index, or dictBase+index.
* Assumption 1 : only valid if tableType == byU32 or byU16.
* Assumption 2 : h is presumed valid (within limits of hash table)
*/
853LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) U32 LZ4_getIndexOnHash(U32 h, const void* tableBase, tableType_t tableType)
854{
  LZ4_STATIC_ASSERT(LZ4_MEMORY_USAGE > 2){ enum { LZ4_static_assert = 1/(int)(!!(14 > 2)) }; };
  if (tableType == byU32) {
      const U32* const hashTable = (const U32*) tableBase;
      assert(h < (1U << (LZ4_MEMORY_USAGE-2)))((void)0);
      return hashTable[h];
  }
  if (tableType == byU16) {
      const U16* const hashTable = (const U16*) tableBase;
      assert(h < (1U << (LZ4_MEMORY_USAGE-1)))((void)0);
      return hashTable[h];
  }
  assert(0)((void)0); return 0;  /* forbidden case */
867}

869static const BYTE* LZ4_getPositionOnHash(U32 h, const void* tableBase, tableType_t tableType)
870{
  assert(tableType == byPtr)((void)0); (void)tableType;
  { const BYTE* const* hashTable = (const BYTE* const*) tableBase; return hashTable[h]; }
873}

875LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) const BYTE*
876LZ4_getPosition(const BYTE* p,
              const void* tableBase, tableType_t tableType)
878{
  U32 const h = LZ4_hashPosition(p, tableType);
  return LZ4_getPositionOnHash(h, tableBase, tableType);
881}

883LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) void
884LZ4_prepareTable(LZ4_stream_t_internal* const cctx,
         const int inputSize,
         const tableType_t tableType) {
  /* If the table hasn't been used, it's guaranteed to be zeroed out, and is
   * therefore safe to use no matter what mode we're in. Otherwise, we figure
   * out if it's safe to leave as is or whether it needs to be reset.
   */
  if ((tableType_t)cctx->tableType != clearedTable) {
      assert(inputSize >= 0)((void)0);
      if ((tableType_t)cctx->tableType != tableType
        || ((tableType == byU16) && cctx->currentOffset + (unsigned)inputSize >= 0xFFFFU)
        || ((tableType == byU32) && cctx->currentOffset > 1 GB*(1U<<30))
        || tableType == byPtr
        || inputSize >= 4 KB*(1 <<10))
      {
          DEBUGLOG(4, "LZ4_prepareTable: Resetting table in %p", cctx){};
          MEM_INIT(cctx->hashTable, 0, LZ4_HASHTABLESIZE)memset(((cctx->hashTable)),((0)),(((1 << 14))));
          cctx->currentOffset = 0;
          cctx->tableType = (U32)clearedTable;
      } else {
          DEBUGLOG(4, "LZ4_prepareTable: Re-use hash table (no reset)"){};
      }
  }

  /* Adding a gap, so all previous entries are > LZ4_DISTANCE_MAX back,
   * is faster than compressing without a gap.
   * However, compressing with currentOffset == 0 is faster still,
   * so we preserve that case.
   */
  if (cctx->currentOffset != 0 && tableType == byU32) {
      DEBUGLOG(5, "LZ4_prepareTable: adding 64KB to currentOffset"){};
      cctx->currentOffset += 64 KB*(1 <<10);
  }

  /* Finally, clear history */
  cctx->dictCtx = NULL((void*)0);
  cctx->dictionary = NULL((void*)0);
  cctx->dictSize = 0;
922}

924/** LZ4_compress_generic_validated() :
*  inlined, to ensure branches are decided at compilation time.
*  The following conditions are presumed already validated:
*  - source != NULL
*  - inputSize > 0
*/
930LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) int LZ4_compress_generic_validated(
               LZ4_stream_t_internal* const cctx,
               const char* const source,
               char* const dest,
               const int inputSize,
               int*  inputConsumed, /* only written when outputDirective == fillOutput */
               const int maxOutputSize,
               const limitedOutput_directive outputDirective,
               const tableType_t tableType,
               const dict_directive dictDirective,
               const dictIssue_directive dictIssue,
               const int acceleration)
942{
  int result;
  const BYTE* ip = (const BYTE*)source;

  U32 const startIndex = cctx->currentOffset;
  const BYTE* base = (const BYTE*)source - startIndex;
  const BYTE* lowLimit;

  const LZ4_stream_t_internal* dictCtx = (const LZ4_stream_t_internal*) cctx->dictCtx;
  const BYTE* const dictionary =
      dictDirective == usingDictCtx ? dictCtx->dictionary : cctx->dictionary;
  const U32 dictSize =
      dictDirective == usingDictCtx ? dictCtx->dictSize : cctx->dictSize;
  const U32 dictDelta =
      (dictDirective == usingDictCtx) ? startIndex - dictCtx->currentOffset : 0;   /* make indexes in dictCtx comparable with indexes in current context */

  int const maybe_extMem = (dictDirective == usingExtDict) || (dictDirective == usingDictCtx);
  U32 const prefixIdxLimit = startIndex - dictSize;   /* used when dictDirective == dictSmall */
  const BYTE* const dictEnd = dictionary ? dictionary + dictSize : dictionary;
  const BYTE* anchor = (const BYTE*) source;
  const BYTE* const iend = ip + inputSize;
  const BYTE* const mflimitPlusOne = iend - MFLIMIT12 + 1;
  const BYTE* const matchlimit = iend - LASTLITERALS5;

  /* the dictCtx currentOffset is indexed on the start of the dictionary,
   * while a dictionary in the current context precedes the currentOffset */
  const BYTE* dictBase = (dictionary == NULL((void*)0)) ? NULL((void*)0) :
                         (dictDirective == usingDictCtx) ?
                          dictionary + dictSize - dictCtx->currentOffset :
                          dictionary + dictSize - startIndex;

  BYTE* op = (BYTE*) dest;
  BYTE* const olimit = op + maxOutputSize;

  U32 offset = 0;
  U32 forwardH;

  DEBUGLOG(5, "LZ4_compress_generic_validated: srcSize=%i, tableType=%u", inputSize, tableType){};
  assert(ip != NULL)((void)0);
  if (tableType == byU16) assert(inputSize<LZ4_64Klimit)((void)0);  /* Size too large (not within 64K limit) */
  if (tableType == byPtr) assert(dictDirective==noDict)((void)0);   /* only supported use case with byPtr */
  /* If init conditions are not met, we don't have to mark stream
   * as having dirty context, since no action was taken yet */
  if (outputDirective == fillOutput && maxOutputSize < 1) { return 0; } /* Impossible to store anything */
  assert(acceleration >= 1)((void)0);

  lowLimit = (const BYTE*)source - (dictDirective == withPrefix64k ? dictSize : 0);

  /* Update context state */
  if (dictDirective == usingDictCtx) {
      /* Subsequent linked blocks can't use the dictionary. */
      /* Instead, they use the block we just compressed. */
      cctx->dictCtx = NULL((void*)0);
      cctx->dictSize = (U32)inputSize;
  } else {
      cctx->dictSize += (U32)inputSize;
  }
  cctx->currentOffset += (U32)inputSize;
  cctx->tableType = (U32)tableType;

  if (inputSize<LZ4_minLength) goto _last_literals;        /* Input too small, no compression (all literals) */

  /* First Byte */
  {   U32 const h = LZ4_hashPosition(ip, tableType);
      if (tableType == byPtr) {
          LZ4_putPositionOnHash(ip, h, cctx->hashTable, byPtr);
      } else {
          LZ4_putIndexOnHash(startIndex, h, cctx->hashTable, tableType);
  }   }
  ip++; forwardH = LZ4_hashPosition(ip, tableType);

  /* Main Loop */
  for ( ; ; ) {
      const BYTE* match;
      BYTE* token;
      const BYTE* filledIp;

      /* Find a match */
      if (tableType == byPtr) {
          const BYTE* forwardIp = ip;
          int step = 1;
          int searchMatchNb = acceleration << LZ4_skipTrigger;
          do {
              U32 const h = forwardH;
              ip = forwardIp;
              forwardIp += step;
              step = (searchMatchNb++ >> LZ4_skipTrigger);

              if (unlikely(forwardIp > mflimitPlusOne)(__builtin_expect (((forwardIp > mflimitPlusOne) != 0),(0)
) )) goto _last_literals;
              assert(ip < mflimitPlusOne)((void)0);

              match = LZ4_getPositionOnHash(h, cctx->hashTable, tableType);
              forwardH = LZ4_hashPosition(forwardIp, tableType);
              LZ4_putPositionOnHash(ip, h, cctx->hashTable, tableType);

          } while ( (match+LZ4_DISTANCE_MAX65535 < ip)
                 || (LZ4_read32(match) != LZ4_read32(ip)) );

      } else {   /* byU32, byU16 */

          const BYTE* forwardIp = ip;
          int step = 1;
          int searchMatchNb = acceleration << LZ4_skipTrigger;
          do {
              U32 const h = forwardH;
              U32 const current = (U32)(forwardIp - base);
              U32 matchIndex = LZ4_getIndexOnHash(h, cctx->hashTable, tableType);
              assert(matchIndex <= current)((void)0);
              assert(forwardIp - base < (ptrdiff_t)(2 GB - 1))((void)0);
              ip = forwardIp;
              forwardIp += step;
              step = (searchMatchNb++ >> LZ4_skipTrigger);

              if (unlikely(forwardIp > mflimitPlusOne)(__builtin_expect (((forwardIp > mflimitPlusOne) != 0),(0)
) )) goto _last_literals;
              assert(ip < mflimitPlusOne)((void)0);

              if (dictDirective == usingDictCtx) {
                  if (matchIndex < startIndex) {
                      /* there was no match, try the dictionary */
                      assert(tableType == byU32)((void)0);
                      matchIndex = LZ4_getIndexOnHash(h, dictCtx->hashTable, byU32);
                      match = dictBase + matchIndex;
                      matchIndex += dictDelta;   /* make dictCtx index comparable with current context */
                      lowLimit = dictionary;
                  } else {
                      match = base + matchIndex;
                      lowLimit = (const BYTE*)source;
                  }
              } else if (dictDirective == usingExtDict) {
                  if (matchIndex < startIndex) {
                      DEBUGLOG(7, "extDict candidate: matchIndex=%5u  <  startIndex=%5u", matchIndex, startIndex){};
                      assert(startIndex - matchIndex >= MINMATCH)((void)0);
                      assert(dictBase)((void)0);
                      match = dictBase + matchIndex;
                      lowLimit = dictionary;
                  } else {
                      match = base + matchIndex;
                      lowLimit = (const BYTE*)source;
                  }
              } else {   /* single continuous memory segment */
                  match = base + matchIndex;
              }
              forwardH = LZ4_hashPosition(forwardIp, tableType);
              LZ4_putIndexOnHash(current, h, cctx->hashTable, tableType);

              DEBUGLOG(7, "candidate at pos=%u  (offset=%u \n", matchIndex, current - matchIndex){};
              if ((dictIssue == dictSmall) && (matchIndex < prefixIdxLimit)) { continue; }    /* match outside of valid area */
              assert(matchIndex < current)((void)0);
              if ( ((tableType != byU16) || (LZ4_DISTANCE_MAX65535 < LZ4_DISTANCE_ABSOLUTE_MAX65535))
                && (matchIndex+LZ4_DISTANCE_MAX65535 < current)) {
                  continue;
              } /* too far */
              assert((current - matchIndex) <= LZ4_DISTANCE_MAX)((void)0);  /* match now expected within distance */

              if (LZ4_read32(match) == LZ4_read32(ip)) {
                  if (maybe_extMem) offset = current - matchIndex;
                  break;   /* match found */
              }

          } while(1);
      }

      /* Catch up */
      filledIp = ip;
      assert(ip > anchor)((void)0); /* this is always true as ip has been advanced before entering the main loop */
      if ((match > lowLimit) && unlikely(ip[-1] == match[-1])(__builtin_expect (((ip[-1] == match[-1]) != 0),(0)) )) {
          do { ip--; match--; } while (((ip > anchor) & (match > lowLimit)) && (unlikely(ip[-1] == match[-1])(__builtin_expect (((ip[-1] == match[-1]) != 0),(0)) )));
      }

      /* Encode Literals */
      {   unsigned const litLength = (unsigned)(ip - anchor);
          token = op++;
          if ((outputDirective == limitedOutput) &&  /* Check output buffer overflow */
              (unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit)(__builtin_expect (((op + litLength + (2 + 1 + 5) + (litLength
/255) > olimit) != 0),(0)) )) ) {
              return 0;   /* cannot compress within `dst` budget. Stored indexes in hash table are nonetheless fine */
          }
          if ((outputDirective == fillOutput) &&
              (unlikely(op + (litLength+240)/255 /* litlen */ + litLength /* literals */ + 2 /* offset */ + 1 /* token */ + MFLIMIT - MINMATCH /* min last literals so last match is <= end - MFLIMIT */ > olimit)(__builtin_expect (((op + (litLength+240)/255 + litLength + 2
 + 1 + 12 - 4 > olimit) != 0),(0)) ))) {
              op--;
              goto _last_literals;
          }
          if (litLength >= RUN_MASK((1U<<(8-4))-1)) {
              unsigned len = litLength - RUN_MASK((1U<<(8-4))-1);
              *token = (RUN_MASK((1U<<(8-4))-1)<<ML_BITS4);
              for(; len >= 255 ; len-=255) *op++ = 255;
              *op++ = (BYTE)len;
          }
          else *token = (BYTE)(litLength<<ML_BITS4);

          /* Copy Literals */
          LZ4_wildCopy8(op, anchor, op+litLength);
          op+=litLength;
          DEBUGLOG(6, "seq.start:%i, literals=%u, match.start:%i",{}
                      (int)(anchor-(const BYTE*)source), litLength, (int)(ip-(const BYTE*)source)){};
      }

1138_next_match:
      /* at this stage, the following variables must be correctly set :
       * - ip : at start of LZ operation
       * - match : at start of previous pattern occurrence; can be within current prefix, or within extDict
       * - offset : if maybe_ext_memSegment==1 (constant)
       * - lowLimit : must be == dictionary to mean "match is within extDict"; must be == source otherwise
       * - token and *token : position to write 4-bits for match length; higher 4-bits for literal length supposed already written
       */

      if ((outputDirective == fillOutput) &&
          (op + 2 /* offset */ + 1 /* token */ + MFLIMIT12 - MINMATCH4 /* min last literals so last match is <= end - MFLIMIT */ > olimit)) {
          /* the match was too close to the end, rewind and go to last literals */
          op = token;
          goto _last_literals;
      }

      /* Encode Offset */
      if (maybe_extMem) {   /* static test */
          DEBUGLOG(6, "             with offset=%u  (ext if > %i)", offset, (int)(ip - (const BYTE*)source)){};
          assert(offset <= LZ4_DISTANCE_MAX && offset > 0)((void)0);
          LZ4_writeLE16(op, (U16)offset); op+=2;
      } else  {
          DEBUGLOG(6, "             with offset=%u  (same segment)", (U32)(ip - match)){};
          assert(ip-match <= LZ4_DISTANCE_MAX)((void)0);
          LZ4_writeLE16(op, (U16)(ip - match)); op+=2;
      }

      /* Encode MatchLength */
      {   unsigned matchCode;

          if ( (dictDirective==usingExtDict || dictDirective==usingDictCtx)
            && (lowLimit==dictionary) /* match within extDict */ ) {
              const BYTE* limit = ip + (dictEnd-match);
              assert(dictEnd > match)((void)0);
              if (limit > matchlimit) limit = matchlimit;
              matchCode = LZ4_count(ip+MINMATCH4, match+MINMATCH4, limit);
              ip += (size_t)matchCode + MINMATCH4;
              if (ip==limit) {
                  unsigned const more = LZ4_count(limit, (const BYTE*)source, matchlimit);
                  matchCode += more;
                  ip += more;
              }
              DEBUGLOG(6, "             with matchLength=%u starting in extDict", matchCode+MINMATCH){};
          } else {
              matchCode = LZ4_count(ip+MINMATCH4, match+MINMATCH4, matchlimit);
              ip += (size_t)matchCode + MINMATCH4;
              DEBUGLOG(6, "             with matchLength=%u", matchCode+MINMATCH){};
          }

          if ((outputDirective) &&    /* Check output buffer overflow */
              (unlikely(op + (1 + LASTLITERALS) + (matchCode+240)/255 > olimit)(__builtin_expect (((op + (1 + 5) + (matchCode+240)/255 > olimit
) != 0),(0)) )) ) {
              if (outputDirective == fillOutput) {
                  /* Match description too long : reduce it */
                  U32 newMatchCode = 15 /* in token */ - 1 /* to avoid needing a zero byte */ + ((U32)(olimit - op) - 1 - LASTLITERALS5) * 255;
                  ip -= matchCode - newMatchCode;
                  assert(newMatchCode < matchCode)((void)0);
                  matchCode = newMatchCode;
                  if (unlikely(ip <= filledIp)(__builtin_expect (((ip <= filledIp) != 0),(0)) )) {
                      /* We have already filled up to filledIp so if ip ends up less than filledIp
                       * we have positions in the hash table beyond the current position. This is
                       * a problem if we reuse the hash table. So we have to remove these positions
                       * from the hash table.
                       */
                      const BYTE* ptr;
                      DEBUGLOG(5, "Clearing %u positions", (U32)(filledIp - ip)){};
                      for (ptr = ip; ptr <= filledIp; ++ptr) {
                          U32 const h = LZ4_hashPosition(ptr, tableType);
                          LZ4_clearHash(h, cctx->hashTable, tableType);
                      }
                  }
              } else {
                  assert(outputDirective == limitedOutput)((void)0);
                  return 0;   /* cannot compress within `dst` budget. Stored indexes in hash table are nonetheless fine */
              }
          }
          if (matchCode >= ML_MASK((1U<<4)-1)) {
              *token += ML_MASK((1U<<4)-1);
              matchCode -= ML_MASK((1U<<4)-1);
              LZ4_write32(op, 0xFFFFFFFF);
              while (matchCode >= 4*255) {
                  op+=4;
                  LZ4_write32(op, 0xFFFFFFFF);
                  matchCode -= 4*255;
              }
              op += matchCode / 255;
              *op++ = (BYTE)(matchCode % 255);
          } else
              *token += (BYTE)(matchCode);
      }
      /* Ensure we have enough space for the last literals. */
      assert(!(outputDirective == fillOutput && op + 1 + LASTLITERALS > olimit))((void)0);

      anchor = ip;

      /* Test end of chunk */
      if (ip >= mflimitPlusOne) break;

      /* Fill table */
      {   U32 const h = LZ4_hashPosition(ip-2, tableType);
          if (tableType == byPtr) {
              LZ4_putPositionOnHash(ip-2, h, cctx->hashTable, byPtr);
          } else {
              U32 const idx = (U32)((ip-2) - base);
              LZ4_putIndexOnHash(idx, h, cctx->hashTable, tableType);
      }   }

      /* Test next position */
      if (tableType == byPtr) {

          match = LZ4_getPosition(ip, cctx->hashTable, tableType);
          LZ4_putPosition(ip, cctx->hashTable, tableType);
          if ( (match+LZ4_DISTANCE_MAX65535 >= ip)
            && (LZ4_read32(match) == LZ4_read32(ip)) )
          { token=op++; *token=0; goto _next_match; }

      } else {   /* byU32, byU16 */

          U32 const h = LZ4_hashPosition(ip, tableType);
          U32 const current = (U32)(ip-base);
          U32 matchIndex = LZ4_getIndexOnHash(h, cctx->hashTable, tableType);
          assert(matchIndex < current)((void)0);
          if (dictDirective == usingDictCtx) {
              if (matchIndex < startIndex) {
                  /* there was no match, try the dictionary */
                  assert(tableType == byU32)((void)0);
                  matchIndex = LZ4_getIndexOnHash(h, dictCtx->hashTable, byU32);
                  match = dictBase + matchIndex;
                  lowLimit = dictionary;   /* required for match length counter */
                  matchIndex += dictDelta;
              } else {
                  match = base + matchIndex;
                  lowLimit = (const BYTE*)source;  /* required for match length counter */
              }
          } else if (dictDirective==usingExtDict) {
              if (matchIndex < startIndex) {
                  assert(dictBase)((void)0);
                  match = dictBase + matchIndex;
                  lowLimit = dictionary;   /* required for match length counter */
              } else {
                  match = base + matchIndex;
                  lowLimit = (const BYTE*)source;   /* required for match length counter */
              }
          } else {   /* single memory segment */
              match = base + matchIndex;
          }
          LZ4_putIndexOnHash(current, h, cctx->hashTable, tableType);
          assert(matchIndex < current)((void)0);
          if ( ((dictIssue==dictSmall) ? (matchIndex >= prefixIdxLimit) : 1)
            && (((tableType==byU16) && (LZ4_DISTANCE_MAX65535 == LZ4_DISTANCE_ABSOLUTE_MAX65535)) ? 1 : (matchIndex+LZ4_DISTANCE_MAX65535 >= current))
            && (LZ4_read32(match) == LZ4_read32(ip)) ) {
              token=op++;
              *token=0;
              if (maybe_extMem) offset = current - matchIndex;
              DEBUGLOG(6, "seq.start:%i, literals=%u, match.start:%i",{}
                          (int)(anchor-(const BYTE*)source), 0, (int)(ip-(const BYTE*)source)){};
              goto _next_match;
          }
      }

      /* Prepare next loop */
      forwardH = LZ4_hashPosition(++ip, tableType);

  }

1302_last_literals:
  /* Encode Last Literals */
  {   size_t lastRun = (size_t)(iend - anchor);
      if ( (outputDirective) &&  /* Check output buffer overflow */
          (op + lastRun + 1 + ((lastRun+255-RUN_MASK((1U<<(8-4))-1))/255) > olimit)) {
          if (outputDirective == fillOutput) {
              /* adapt lastRun to fill 'dst' */
              assert(olimit >= op)((void)0);
              lastRun  = (size_t)(olimit-op) - 1/*token*/;
              lastRun -= (lastRun + 256 - RUN_MASK((1U<<(8-4))-1)) / 256;  /*additional length tokens*/
          } else {
              assert(outputDirective == limitedOutput)((void)0);
              return 0;   /* cannot compress within `dst` budget. Stored indexes in hash table are nonetheless fine */
          }
      }
      DEBUGLOG(6, "Final literal run : %i literals", (int)lastRun){};
      if (lastRun >= RUN_MASK((1U<<(8-4))-1)) {
          size_t accumulator = lastRun - RUN_MASK((1U<<(8-4))-1);
          *op++ = RUN_MASK((1U<<(8-4))-1) << ML_BITS4;
          for(; accumulator >= 255 ; accumulator-=255) *op++ = 255;
          *op++ = (BYTE) accumulator;
      } else {
          *op++ = (BYTE)(lastRun<<ML_BITS4);
      }
      LZ4_memcpy(op, anchor, lastRun)__builtin_memcpy(op, anchor, lastRun);
      ip = anchor + lastRun;
      op += lastRun;
  }

  if (outputDirective == fillOutput) {
      *inputConsumed = (int) (((const char*)ip)-source);
  }
  result = (int)(((char*)op) - dest);
  assert(result > 0)((void)0);
  DEBUGLOG(5, "LZ4_compress_generic: compressed %i bytes into %i bytes", inputSize, result){};
  return result;
1338}

1340/** LZ4_compress_generic() :
*  inlined, to ensure branches are decided at compilation time;
*  takes care of src == (NULL, 0)
*  and forward the rest to LZ4_compress_generic_validated */
1344LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) int LZ4_compress_generic(
               LZ4_stream_t_internal* const cctx,
               const char* const src,
               char* const dst,
               const int srcSize,
               int *inputConsumed, /* only written when outputDirective == fillOutput */
               const int dstCapacity,
               const limitedOutput_directive outputDirective,
               const tableType_t tableType,
               const dict_directive dictDirective,
               const dictIssue_directive dictIssue,
               const int acceleration)
1356{
  DEBUGLOG(5, "LZ4_compress_generic: srcSize=%i, dstCapacity=%i",{}
              srcSize, dstCapacity){};

  if ((U32)srcSize > (U32)LZ4_MAX_INPUT_SIZE0x7E000000) { return 0; }  /* Unsupported srcSize, too large (or negative) */
  if (srcSize == 0) {   /* src == NULL supported if srcSize == 0 */
      if (outputDirective != notLimited && dstCapacity <= 0) return 0;  /* no output, can't write anything */
      DEBUGLOG(5, "Generating an empty block"){};
      assert(outputDirective == notLimited || dstCapacity >= 1)((void)0);
      assert(dst != NULL)((void)0);
      dst[0] = 0;
      if (outputDirective == fillOutput) {
          assert (inputConsumed != NULL)((void)0);
          *inputConsumed = 0;
      }
      return 1;
  }
  assert(src != NULL)((void)0);

  return LZ4_compress_generic_validated(cctx, src, dst, srcSize,
              inputConsumed, /* only written into if outputDirective == fillOutput */
              dstCapacity, outputDirective,
              tableType, dictDirective, dictIssue, acceleration);
1379}


1382int LZ4_compress_fast_extState(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
1383{
  LZ4_stream_t_internal* const ctx = & LZ4_initStream(state, sizeof(LZ4_stream_t)) -> internal_donotuse;
  assert(ctx != NULL)((void)0);
  if (acceleration < 1) acceleration = LZ4_ACCELERATION_DEFAULT1;
  if (acceleration > LZ4_ACCELERATION_MAX65537) acceleration = LZ4_ACCELERATION_MAX65537;
  if (maxOutputSize >= LZ4_compressBound(inputSize)) {
      if (inputSize < LZ4_64Klimit) {
          return LZ4_compress_generic(ctx, source, dest, inputSize, NULL((void*)0), 0, notLimited, byU16, noDict, noDictIssue, acceleration);
      } else {
          const tableType_t tableType = ((sizeof(void*)==4) && ((uptrval)source > LZ4_DISTANCE_MAX65535)) ? byPtr : byU32;
          return LZ4_compress_generic(ctx, source, dest, inputSize, NULL((void*)0), 0, notLimited, tableType, noDict, noDictIssue, acceleration);
      }
  } else {
      if (inputSize < LZ4_64Klimit) {
          return LZ4_compress_generic(ctx, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration);
      } else {
          const tableType_t tableType = ((sizeof(void*)==4) && ((uptrval)source > LZ4_DISTANCE_MAX65535)) ? byPtr : byU32;
          return LZ4_compress_generic(ctx, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, noDict, noDictIssue, acceleration);
      }
  }
1403}

1405/**
* LZ4_compress_fast_extState_fastReset() :
* A variant of LZ4_compress_fast_extState().
*
* Using this variant avoids an expensive initialization step. It is only safe
* to call if the state buffer is known to be correctly initialized already
* (see comment in lz4.h on LZ4_resetStream_fast() for a definition of
* "correctly initialized").
*/
1414int LZ4_compress_fast_extState_fastReset(void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration)
1415{
  LZ4_stream_t_internal* const ctx = &((LZ4_stream_t*)state)->internal_donotuse;
  if (acceleration < 1) acceleration = LZ4_ACCELERATION_DEFAULT1;
  if (acceleration > LZ4_ACCELERATION_MAX65537) acceleration = LZ4_ACCELERATION_MAX65537;
  assert(ctx != NULL)((void)0);

  if (dstCapacity >= LZ4_compressBound(srcSize)) {
      if (srcSize < LZ4_64Klimit) {
          const tableType_t tableType = byU16;
          LZ4_prepareTable(ctx, srcSize, tableType);
          if (ctx->currentOffset) {
              return LZ4_compress_generic(ctx, src, dst, srcSize, NULL((void*)0), 0, notLimited, tableType, noDict, dictSmall, acceleration);
          } else {
              return LZ4_compress_generic(ctx, src, dst, srcSize, NULL((void*)0), 0, notLimited, tableType, noDict, noDictIssue, acceleration);
          }
      } else {
          const tableType_t tableType = ((sizeof(void*)==4) && ((uptrval)src > LZ4_DISTANCE_MAX65535)) ? byPtr : byU32;
          LZ4_prepareTable(ctx, srcSize, tableType);
          return LZ4_compress_generic(ctx, src, dst, srcSize, NULL((void*)0), 0, notLimited, tableType, noDict, noDictIssue, acceleration);
      }
  } else {
      if (srcSize < LZ4_64Klimit) {
          const tableType_t tableType = byU16;
          LZ4_prepareTable(ctx, srcSize, tableType);
          if (ctx->currentOffset) {
              return LZ4_compress_generic(ctx, src, dst, srcSize, NULL((void*)0), dstCapacity, limitedOutput, tableType, noDict, dictSmall, acceleration);
          } else {
              return LZ4_compress_generic(ctx, src, dst, srcSize, NULL((void*)0), dstCapacity, limitedOutput, tableType, noDict, noDictIssue, acceleration);
          }
      } else {
          const tableType_t tableType = ((sizeof(void*)==4) && ((uptrval)src > LZ4_DISTANCE_MAX65535)) ? byPtr : byU32;
          LZ4_prepareTable(ctx, srcSize, tableType);
          return LZ4_compress_generic(ctx, src, dst, srcSize, NULL((void*)0), dstCapacity, limitedOutput, tableType, noDict, noDictIssue, acceleration);
      }
  }
1450}


1453int LZ4_compress_fast(const char* src, char* dest, int srcSize, int dstCapacity, int acceleration)
1454{
  int result;
1456#if (LZ4_HEAPMODE0)
  LZ4_stream_t* const ctxPtr = (LZ4_stream_t*)ALLOC(sizeof(LZ4_stream_t))malloc(sizeof(LZ4_stream_t));   /* malloc-calloc always properly aligned */
  if (ctxPtr == NULL((void*)0)) return 0;
1459#else
  LZ4_stream_t ctx;
  LZ4_stream_t* const ctxPtr = &ctx;
1462#endif
  result = LZ4_compress_fast_extState(ctxPtr, src, dest, srcSize, dstCapacity, acceleration);

1465#if (LZ4_HEAPMODE0)
  FREEMEM(ctxPtr)free(ctxPtr);
1467#endif
  return result;
1469}


1472int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity)
1473{
  return LZ4_compress_fast(src, dst, srcSize, dstCapacity, 1);
1475}


1478/* Note!: This function leaves the stream in an unclean/broken state!
* It is not safe to subsequently use the same state with a _fastReset() or
* _continue() call without resetting it. */
1481static int LZ4_compress_destSize_extState_internal(LZ4_stream_t* state, const char* src, char* dst, int* srcSizePtr, int targetDstSize, int acceleration)
1482{
  void* const s = LZ4_initStream(state, sizeof (*state));
  assert(s != NULL)((void)0); (void)s;

  if (targetDstSize >= LZ4_compressBound(*srcSizePtr)) {  /* compression success is guaranteed */
      return LZ4_compress_fast_extState(state, src, dst, *srcSizePtr, targetDstSize, acceleration);
  } else {
      if (*srcSizePtr < LZ4_64Klimit) {
          return LZ4_compress_generic(&state->internal_donotuse, src, dst, *srcSizePtr, srcSizePtr, targetDstSize, fillOutput, byU16, noDict, noDictIssue, acceleration);
      } else {
          tableType_t const addrMode = ((sizeof(void*)==4) && ((uptrval)src > LZ4_DISTANCE_MAX65535)) ? byPtr : byU32;
          return LZ4_compress_generic(&state->internal_donotuse, src, dst, *srcSizePtr, srcSizePtr, targetDstSize, fillOutput, addrMode, noDict, noDictIssue, acceleration);
  }   }
1495}

1497int LZ4_compress_destSize_extState(void* state, const char* src, char* dst, int* srcSizePtr, int targetDstSize, int acceleration)
1498{
  int const r = LZ4_compress_destSize_extState_internal((LZ4_stream_t*)state, src, dst, srcSizePtr, targetDstSize, acceleration);
  /* clean the state on exit */
  LZ4_initStream(state, sizeof (LZ4_stream_t));
  return r;
1503}


1506int LZ4_compress_destSize(const char* src, char* dst, int* srcSizePtr, int targetDstSize)
1507{
1508#if (LZ4_HEAPMODE0)
  LZ4_stream_t* const ctx = (LZ4_stream_t*)ALLOC(sizeof(LZ4_stream_t))malloc(sizeof(LZ4_stream_t));   /* malloc-calloc always properly aligned */
  if (ctx == NULL((void*)0)) return 0;
1511#else
  LZ4_stream_t ctxBody;
  LZ4_stream_t* const ctx = &ctxBody;
1514#endif

  int result = LZ4_compress_destSize_extState_internal(ctx, src, dst, srcSizePtr, targetDstSize, 1);

1518#if (LZ4_HEAPMODE0)
  FREEMEM(ctx)free(ctx);
1520#endif
  return result;
1522}



1526/*-******************************
1527*  Streaming functions
1528********************************/

1530#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
1531LZ4_stream_t* LZ4_createStream(void)
1532{
  LZ4_stream_t* const lz4s = (LZ4_stream_t*)ALLOC(sizeof(LZ4_stream_t))malloc(sizeof(LZ4_stream_t));
  LZ4_STATIC_ASSERT(sizeof(LZ4_stream_t) >= sizeof(LZ4_stream_t_internal)){ enum { LZ4_static_assert = 1/(int)(!!(sizeof(LZ4_stream_t) >=
 sizeof(LZ4_stream_t_internal))) }; };
  DEBUGLOG(4, "LZ4_createStream %p", lz4s){};
  if (lz4s == NULL((void*)0)) return NULL((void*)0);
  LZ4_initStream(lz4s, sizeof(*lz4s));
  return lz4s;
1539}
1540#endif

1542static size_t LZ4_stream_t_alignment(void)
1543{
1544#if LZ4_ALIGN_TEST1
  typedef struct { char c; LZ4_stream_t t; } t_a;
  return sizeof(t_a) - sizeof(LZ4_stream_t);
1547#else
  return 1;  /* effectively disabled */
1549#endif
1550}

1552LZ4_stream_t* LZ4_initStream (void* buffer, size_t size)
1553{
  DEBUGLOG(5, "LZ4_initStream"){};
  if (buffer == NULL((void*)0)) { return NULL((void*)0); }
  if (size < sizeof(LZ4_stream_t)) { return NULL((void*)0); }
  if (!LZ4_isAligned(buffer, LZ4_stream_t_alignment())) return NULL((void*)0);
  MEM_INIT(buffer, 0, sizeof(LZ4_stream_t_internal))memset(((buffer)),((0)),((sizeof(LZ4_stream_t_internal))));
  return (LZ4_stream_t*)buffer;
1560}

1562/* resetStream is now deprecated,
* prefer initStream() which is more general */
1564void LZ4_resetStream (LZ4_stream_t* LZ4_stream)
1565{
  DEBUGLOG(5, "LZ4_resetStream (ctx:%p)", LZ4_stream){};
  MEM_INIT(LZ4_stream, 0, sizeof(LZ4_stream_t_internal))memset(((LZ4_stream)),((0)),((sizeof(LZ4_stream_t_internal)))
);
1568}

1570void LZ4_resetStream_fast(LZ4_stream_t* ctx) {
  LZ4_prepareTable(&(ctx->internal_donotuse), 0, byU32);
1572}

1574#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
1575int LZ4_freeStream (LZ4_stream_t* LZ4_stream)
1576{
  if (!LZ4_stream) return 0;   /* support free on NULL */
  DEBUGLOG(5, "LZ4_freeStream %p", LZ4_stream){};
  FREEMEM(LZ4_stream)free(LZ4_stream);
  return (0);
1581}
1582#endif


1585typedef enum { _ld_fast, _ld_slow } LoadDict_mode_e;
1586#define HASH_UNITsizeof(reg_t) sizeof(reg_t)
1587int LZ4_loadDict_internal(LZ4_stream_t* LZ4_dict,
                  const char* dictionary, int dictSize,
                  LoadDict_mode_e _ld)
1590{
  LZ4_stream_t_internal* const dict = &LZ4_dict->internal_donotuse;
  const tableType_t tableType = byU32;
  const BYTE* p = (const BYTE*)dictionary;
  const BYTE* const dictEnd = p + dictSize;
  U32 idx32;

  DEBUGLOG(4, "LZ4_loadDict (%i bytes from %p into %p)", dictSize, dictionary, LZ4_dict){};

  /* It's necessary to reset the context,
   * and not just continue it with prepareTable()
   * to avoid any risk of generating overflowing matchIndex
   * when compressing using this dictionary */
  LZ4_resetStream(LZ4_dict);

  /* We always increment the offset by 64 KB, since, if the dict is longer,
   * we truncate it to the last 64k, and if it's shorter, we still want to
   * advance by a whole window length so we can provide the guarantee that
   * there are only valid offsets in the window, which allows an optimization
   * in LZ4_compress_fast_continue() where it uses noDictIssue even when the
   * dictionary isn't a full 64k. */
  dict->currentOffset += 64 KB*(1 <<10);

  if (dictSize < (int)HASH_UNITsizeof(reg_t)) {
      return 0;
  }

  if ((dictEnd - p) > 64 KB*(1 <<10)) p = dictEnd - 64 KB*(1 <<10);
  dict->dictionary = p;
  dict->dictSize = (U32)(dictEnd - p);
  dict->tableType = (U32)tableType;
  idx32 = dict->currentOffset - dict->dictSize;

  while (p <= dictEnd-HASH_UNITsizeof(reg_t)) {
      U32 const h = LZ4_hashPosition(p, tableType);
      /* Note: overwriting => favors positions end of dictionary */
      LZ4_putIndexOnHash(idx32, h, dict->hashTable, tableType);
      p+=3; idx32+=3;
  }

  if (_ld == _ld_slow) {
      /* Fill hash table with additional references, to improve compression capability */
      p = dict->dictionary;
      idx32 = dict->currentOffset - dict->dictSize;
      while (p <= dictEnd-HASH_UNITsizeof(reg_t)) {
          U32 const h = LZ4_hashPosition(p, tableType);
          U32 const limit = dict->currentOffset - 64 KB*(1 <<10);
          if (LZ4_getIndexOnHash(h, dict->hashTable, tableType) <= limit) {
              /* Note: not overwriting => favors positions beginning of dictionary */
              LZ4_putIndexOnHash(idx32, h, dict->hashTable, tableType);
          }
          p++; idx32++;
      }
  }

  return (int)dict->dictSize;
1646}

1648int LZ4_loadDict(LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize)
1649{
  return LZ4_loadDict_internal(LZ4_dict, dictionary, dictSize, _ld_fast);
1651}

1653int LZ4_loadDictSlow(LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize)
1654{
  return LZ4_loadDict_internal(LZ4_dict, dictionary, dictSize, _ld_slow);
1656}

1658void LZ4_attach_dictionary(LZ4_stream_t* workingStream, const LZ4_stream_t* dictionaryStream)
1659{
  const LZ4_stream_t_internal* dictCtx = (dictionaryStream == NULL((void*)0)) ? NULL((void*)0) :
      &(dictionaryStream->internal_donotuse);

  DEBUGLOG(4, "LZ4_attach_dictionary (%p, %p, size %u)",{}
           workingStream, dictionaryStream,{}
           dictCtx != NULL ? dictCtx->dictSize : 0){};

  if (dictCtx != NULL((void*)0)) {
      /* If the current offset is zero, we will never look in the
       * external dictionary context, since there is no value a table
       * entry can take that indicate a miss. In that case, we need
       * to bump the offset to something non-zero.
       */
      if (workingStream->internal_donotuse.currentOffset == 0) {
          workingStream->internal_donotuse.currentOffset = 64 KB*(1 <<10);
      }

      /* Don't actually attach an empty dictionary.
       */
      if (dictCtx->dictSize == 0) {
          dictCtx = NULL((void*)0);
      }
  }
  workingStream->internal_donotuse.dictCtx = dictCtx;
1684}


1687static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, int nextSize)
1688{
  assert(nextSize >= 0)((void)0);
  if (LZ4_dict->currentOffset + (unsigned)nextSize > 0x80000000) {   /* potential ptrdiff_t overflow (32-bits mode) */
      /* rescale hash table */
      U32 const delta = LZ4_dict->currentOffset - 64 KB*(1 <<10);
      const BYTE* dictEnd = LZ4_dict->dictionary + LZ4_dict->dictSize;
      int i;
      DEBUGLOG(4, "LZ4_renormDictT"){};
      for (i=0; i<LZ4_HASH_SIZE_U32(1 << (14 -2)); i++) {
          if (LZ4_dict->hashTable[i] < delta) LZ4_dict->hashTable[i]=0;
          else LZ4_dict->hashTable[i] -= delta;
      }
      LZ4_dict->currentOffset = 64 KB*(1 <<10);
      if (LZ4_dict->dictSize > 64 KB*(1 <<10)) LZ4_dict->dictSize = 64 KB*(1 <<10);
      LZ4_dict->dictionary = dictEnd - LZ4_dict->dictSize;
  }
1704}


1707int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream,
                              const char* source, char* dest,
                              int inputSize, int maxOutputSize,
                              int acceleration)
1711{
  const tableType_t tableType = byU32;
  LZ4_stream_t_internal* const streamPtr = &LZ4_stream->internal_donotuse;
  const char* dictEnd = streamPtr->dictSize ? (const char*)streamPtr->dictionary + streamPtr->dictSize : NULL((void*)0);

  DEBUGLOG(5, "LZ4_compress_fast_continue (inputSize=%i, dictSize=%u)", inputSize, streamPtr->dictSize){};

  LZ4_renormDictT(streamPtr, inputSize);   /* fix index overflow */
  if (acceleration < 1) acceleration = LZ4_ACCELERATION_DEFAULT1;
  if (acceleration > LZ4_ACCELERATION_MAX65537) acceleration = LZ4_ACCELERATION_MAX65537;

  /* invalidate tiny dictionaries */
  if ( (streamPtr->dictSize < 4)     /* tiny dictionary : not enough for a hash */
    && (dictEnd != source)           /* prefix mode */
    && (inputSize > 0)               /* tolerance : don't lose history, in case next invocation would use prefix mode */
    && (streamPtr->dictCtx == NULL((void*)0))  /* usingDictCtx */
    ) {
      DEBUGLOG(5, "LZ4_compress_fast_continue: dictSize(%u) at addr:%p is too small", streamPtr->dictSize, streamPtr->dictionary){};
      /* remove dictionary existence from history, to employ faster prefix mode */
      streamPtr->dictSize = 0;
      streamPtr->dictionary = (const BYTE*)source;
      dictEnd = source;
  }

  /* Check overlapping input/dictionary space */
  {   const char* const sourceEnd = source + inputSize;
      if ((sourceEnd > (const char*)streamPtr->dictionary) && (sourceEnd < dictEnd)) {
          streamPtr->dictSize = (U32)(dictEnd - sourceEnd);
          if (streamPtr->dictSize > 64 KB*(1 <<10)) streamPtr->dictSize = 64 KB*(1 <<10);
          if (streamPtr->dictSize < 4) streamPtr->dictSize = 0;
          streamPtr->dictionary = (const BYTE*)dictEnd - streamPtr->dictSize;
      }
  }

  /* prefix mode : source data follows dictionary */
  if (dictEnd == source) {
      if ((streamPtr->dictSize < 64 KB*(1 <<10)) && (streamPtr->dictSize < streamPtr->currentOffset))
          return LZ4_compress_generic(streamPtr, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, withPrefix64k, dictSmall, acceleration);
      else
          return LZ4_compress_generic(streamPtr, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, withPrefix64k, noDictIssue, acceleration);
  }

  /* external dictionary mode */
  {   int result;
      if (streamPtr->dictCtx) {
          /* We depend here on the fact that dictCtx'es (produced by
           * LZ4_loadDict) guarantee that their tables contain no references
           * to offsets between dictCtx->currentOffset - 64 KB and
           * dictCtx->currentOffset - dictCtx->dictSize. This makes it safe
           * to use noDictIssue even when the dict isn't a full 64 KB.
           */
          if (inputSize > 4 KB*(1 <<10)) {
              /* For compressing large blobs, it is faster to pay the setup
               * cost to copy the dictionary's tables into the active context,
               * so that the compression loop is only looking into one table.
               */
              LZ4_memcpy(streamPtr, streamPtr->dictCtx, sizeof(*streamPtr))__builtin_memcpy(streamPtr, streamPtr->dictCtx, sizeof(*streamPtr
));
              result = LZ4_compress_generic(streamPtr, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, usingExtDict, noDictIssue, acceleration);
          } else {
              result = LZ4_compress_generic(streamPtr, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, usingDictCtx, noDictIssue, acceleration);
          }
      } else {  /* small data <= 4 KB */
          if ((streamPtr->dictSize < 64 KB*(1 <<10)) && (streamPtr->dictSize < streamPtr->currentOffset)) {
              result = LZ4_compress_generic(streamPtr, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, usingExtDict, dictSmall, acceleration);
          } else {
              result = LZ4_compress_generic(streamPtr, source, dest, inputSize, NULL((void*)0), maxOutputSize, limitedOutput, tableType, usingExtDict, noDictIssue, acceleration);
          }
      }
      streamPtr->dictionary = (const BYTE*)source;
      streamPtr->dictSize = (U32)inputSize;
      return result;
  }
1783}


1786/* Hidden debug function, to force-test external dictionary mode */
1787int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int srcSize)
1788{
  LZ4_stream_t_internal* const streamPtr = &LZ4_dict->internal_donotuse;
  int result;

  LZ4_renormDictT(streamPtr, srcSize);

  if ((streamPtr->dictSize < 64 KB*(1 <<10)) && (streamPtr->dictSize < streamPtr->currentOffset)) {
      result = LZ4_compress_generic(streamPtr, source, dest, srcSize, NULL((void*)0), 0, notLimited, byU32, usingExtDict, dictSmall, 1);
  } else {
      result = LZ4_compress_generic(streamPtr, source, dest, srcSize, NULL((void*)0), 0, notLimited, byU32, usingExtDict, noDictIssue, 1);
  }

  streamPtr->dictionary = (const BYTE*)source;
  streamPtr->dictSize = (U32)srcSize;

  return result;
1804}


1807/*! LZ4_saveDict() :
*  If previously compressed data block is not guaranteed to remain available at its memory location,
*  save it into a safer place (char* safeBuffer).
*  Note : no need to call LZ4_loadDict() afterwards, dictionary is immediately usable,
*         one can therefore call LZ4_compress_fast_continue() right after.
* @return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
*/
1814int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize)
1815{
  LZ4_stream_t_internal* const dict = &LZ4_dict->internal_donotuse;

  DEBUGLOG(5, "LZ4_saveDict : dictSize=%i, safeBuffer=%p", dictSize, safeBuffer){};

  if ((U32)dictSize > 64 KB*(1 <<10)) { dictSize = 64 KB*(1 <<10); } /* useless to define a dictionary > 64 KB */
  if ((U32)dictSize > dict->dictSize) { dictSize = (int)dict->dictSize; }

  if (safeBuffer == NULL((void*)0)) assert(dictSize == 0)((void)0);
  if (dictSize > 0) {
      const BYTE* const previousDictEnd = dict->dictionary + dict->dictSize;
      assert(dict->dictionary)((void)0);
      LZ4_memmove__builtin_memmove(safeBuffer, previousDictEnd - dictSize, (size_t)dictSize);
  }

  dict->dictionary = (const BYTE*)safeBuffer;
  dict->dictSize = (U32)dictSize;

  return dictSize;
1834}



1838/*-*******************************
*  Decompression functions
********************************/

1842typedef enum { decode_full_block = 0, partial_decode = 1 } earlyEnd_directive;

1844#undef MIN
1845#define MIN(a,b)( (a) < (b) ? (a) : (b) )    ( (a) < (b) ? (a) : (b) )


1848/* variant for decompress_unsafe()
* does not know end of input
* presumes input is well formed
* note : will consume at least one byte */
1852static size_t read_long_length_no_check(const BYTE** pp)
1853{
  size_t b, l = 0;
  do { b = **pp; (*pp)++; l += b; } while (b==255);
  DEBUGLOG(6, "read_long_length_no_check: +length=%zu using %zu input bytes", l, l/255 + 1){}
  return l;
1858}

1860/* core decoder variant for LZ4_decompress_fast*()
* for legacy support only : these entry points are deprecated.
* - Presumes input is correctly formed (no defense vs malformed inputs)
* - Does not know input size (presume input buffer is "large enough")
* - Decompress a full block (only)
* @return : nb of bytes read from input.
* Note : this variant is not optimized for speed, just for maintenance.
*        the goal is to remove support of decompress_fast*() variants by v2.0
1868**/
1869LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) int
1870LZ4_decompress_unsafe_generic(
               const BYTE* const istart,
               BYTE* const ostart,
               int decompressedSize,

               size_t prefixSize,
               const BYTE* const dictStart,  /* only if dict==usingExtDict */
               const size_t dictSize         /* note: =0 if dictStart==NULL */
               )
1879{
  const BYTE* ip = istart;
  BYTE* op = (BYTE*)ostart;
  BYTE* const oend = ostart + decompressedSize;
  const BYTE* const prefixStart = ostart - prefixSize;

  DEBUGLOG(5, "LZ4_decompress_unsafe_generic"){};
  if (dictStart == NULL((void*)0)) assert(dictSize == 0)((void)0);

  while (1) {
      /* start new sequence */
      unsigned token = *ip++;

      /* literals */
      {   size_t ll = token >> ML_BITS4;
          if (ll==15) {
              /* long literal length */
              ll += read_long_length_no_check(&ip);
          }
          if ((size_t)(oend-op) < ll) return -1; /* output buffer overflow */
          LZ4_memmove__builtin_memmove(op, ip, ll); /* support in-place decompression */
          op += ll;
          ip += ll;
          if ((size_t)(oend-op) < MFLIMIT12) {
              if (op==oend) break;  /* end of block */
              DEBUGLOG(5, "invalid: literals end at distance %zi from end of block", oend-op){};
              /* incorrect end of block :
               * last match must start at least MFLIMIT==12 bytes before end of output block */
              return -1;
      }   }

      /* match */
      {   size_t ml = token & 15;
          size_t const offset = LZ4_readLE16(ip);
          ip+=2;

          if (ml==15) {
              /* long literal length */
              ml += read_long_length_no_check(&ip);
          }
          ml += MINMATCH4;

          if ((size_t)(oend-op) < ml) return -1; /* output buffer overflow */

          {   const BYTE* match = op - offset;

              /* out of range */
              if (offset > (size_t)(op - prefixStart) + dictSize) {
                  DEBUGLOG(6, "offset out of range"){};
                  return -1;
              }

              /* check special case : extDict */
              if (offset > (size_t)(op - prefixStart)) {
                  /* extDict scenario */
                  const BYTE* const dictEnd = dictStart + dictSize;
                  const BYTE* extMatch = dictEnd - (offset - (size_t)(op-prefixStart));
                  size_t const extml = (size_t)(dictEnd - extMatch);
                  if (extml > ml) {
                      /* match entirely within extDict */
                      LZ4_memmove__builtin_memmove(op, extMatch, ml);
                      op += ml;
                      ml = 0;
                  } else {
                      /* match split between extDict & prefix */
                      LZ4_memmove__builtin_memmove(op, extMatch, extml);
                      op += extml;
                      ml -= extml;
                  }
                  match = prefixStart;
              }

              /* match copy - slow variant, supporting overlap copy */
              {   size_t u;
                  for (u=0; u<ml; u++) {
                      op[u] = match[u];
          }   }   }
          op += ml;
          if ((size_t)(oend-op) < LASTLITERALS5) {
              DEBUGLOG(5, "invalid: match ends at distance %zi from end of block", oend-op){};
              /* incorrect end of block :
               * last match must stop at least LASTLITERALS==5 bytes before end of output block */
              return -1;
          }
      } /* match */
  } /* main loop */
  return (int)(ip - istart);
1966}


1969/* Read the variable-length literal or match length.
*
* @ip : input pointer
* @ilimit : position after which if length is not decoded, the input is necessarily corrupted.
* @initial_check - check ip >= ipmax before start of loop.  Returns initial_error if so.
* @error (output) - error code.  Must be set to 0 before call.
1975**/
1976typedef size_t Rvl_t;
1977static const Rvl_t rvl_error = (Rvl_t)(-1);
1978LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) Rvl_t
1979read_variable_length(const BYTE** ip, const BYTE* ilimit,
                   int initial_check)
1981{
  Rvl_t s, length = 0;
  assert(ip != NULL)((void)0);
  assert(*ip !=  NULL)((void)0);
  assert(ilimit != NULL)((void)0);
  if (initial_check && unlikely((*ip) >= ilimit)(__builtin_expect ((((*ip) >= ilimit) != 0),(0)) )) {    /* read limit reached */
      return rvl_error;
  }
  s = **ip;
  (*ip)++;
  length += s;
  if (unlikely((*ip) > ilimit)(__builtin_expect ((((*ip) > ilimit) != 0),(0)) )) {    /* read limit reached */
      return rvl_error;
  }
  /* accumulator overflow detection (32-bit mode only) */
  if ((sizeof(length) < 8) && unlikely(length > ((Rvl_t)(-1)/2))(__builtin_expect (((length > ((Rvl_t)(-1)/2)) != 0),(0)) ) ) {
      return rvl_error;
  }
  if (likely(s != 255)(__builtin_expect (((s != 255) != 0),(1)) )) return length;
  do {
      s = **ip;
      (*ip)++;
      length += s;
      if (unlikely((*ip) > ilimit)(__builtin_expect ((((*ip) > ilimit) != 0),(0)) )) {    /* read limit reached */
          return rvl_error;
      }
      /* accumulator overflow detection (32-bit mode only) */
      if ((sizeof(length) < 8) && unlikely(length > ((Rvl_t)(-1)/2))(__builtin_expect (((length > ((Rvl_t)(-1)/2)) != 0),(0)) ) ) {
          return rvl_error;
      }
  } while (s == 255);

  return length;
2014}

2016/*! LZ4_decompress_generic() :
*  This generic decompression function covers all use cases.
*  It shall be instantiated several times, using different sets of directives.
*  Note that it is important for performance that this function really get inlined,
*  in order to remove useless branches during compilation optimization.
*/
2022LZ4_FORCE_INLINEstatic inline __attribute__((always_inline)) int
2023LZ4_decompress_generic(
               const char* const src,
               char* const dst,
               int srcSize,
               int outputSize,         /* If endOnInput==endOnInputSize, this value is `dstCapacity` */

               earlyEnd_directive partialDecoding,  /* full, partial */
               dict_directive dict,                 /* noDict, withPrefix64k, usingExtDict */
               const BYTE* const lowPrefix,  /* always <= dst, == dst when no prefix */
               const BYTE* const dictStart,  /* only if dict==usingExtDict */
               const size_t dictSize         /* note : = 0 if noDict */
               )
2035{
  if ((src == NULL((void*)0)) || (outputSize < 0)) { return -1; }
1
Assuming 'src' is not equal to NULL→
2
←
Assuming 'outputSize' is >= 0→
3
←
Taking false branch→

  {   const BYTE* ip = (const BYTE*) src;
      const BYTE* const iend = ip + srcSize;

      BYTE* op = (BYTE*) dst;
      BYTE* const oend = op + outputSize;
      BYTE* cpy;

      const BYTE* const dictEnd = (dictStart == NULL((void*)0)) ? NULL((void*)0) : dictStart + dictSize;
4
←
Assuming 'dictStart' is equal to NULL→
5
←
'?' condition is true→
6
←
'dictEnd' initialized to a null pointer value→

      const int checkOffset = (dictSize < (int)(64 KB*(1 <<10)));
7
←
Assuming the condition is false→


      /* Set up the "end" pointers for the shortcut. */
      const BYTE* const shortiend = iend - 14 /*maxLL*/ - 2 /*offset*/;
      const BYTE* const shortoend = oend - 14 /*maxLL*/ - 18 /*maxML*/;

      const BYTE* match;
      size_t offset;
      unsigned token;
      size_t length;


      DEBUGLOG(5, "LZ4_decompress_generic (srcSize:%i, dstSize:%i)", srcSize, outputSize){};

      /* Special cases */
      assert(lowPrefix <= op)((void)0);
      if (unlikely(outputSize==0)(__builtin_expect (((outputSize==0) != 0),(0)) )) {
8
←
Assuming 'outputSize' is not equal to 0→
9
←
Taking false branch→
          /* Empty output buffer */
          if (partialDecoding) return 0;
          return ((srcSize==1) && (*ip==0)) ? 0 : -1;
      }
      if (unlikely(srcSize==0)(__builtin_expect (((srcSize==0) != 0),(0)) )) { return -1; }
10
←
Assuming 'srcSize' is not equal to 0→
11
←
Taking false branch→

  /* LZ4_FAST_DEC_LOOP:
   * designed for modern OoO performance cpus,
   * where copying reliably 32-bytes is preferable to an unpredictable branch.
   * note : fast loop may show a regression for some client arm chips. */
2075#if LZ4_FAST_DEC_LOOP1
      if ((oend - op) < FASTLOOP_SAFE_DISTANCE64) {
12
←
Assuming the condition is false→
13
←
Taking false branch→
          DEBUGLOG(6, "move to safe decode loop"){};
          goto safe_decode;
      }

      /* Fast loop : decode sequences as long as output < oend-FASTLOOP_SAFE_DISTANCE */
      DEBUGLOG(6, "using fast decode loop"){};
      while (1) {
14
←
Loop condition is true.  Entering loop body→
          /* Main fastloop assertion: We can always wildcopy FASTLOOP_SAFE_DISTANCE */
          assert(oend - op >= FASTLOOP_SAFE_DISTANCE)((void)0);
          assert(ip < iend)((void)0);
          token = *ip++;
          length = token >> ML_BITS4;  /* literal length */
          DEBUGLOG(7, "blockPos%6u: litLength token = %u", (unsigned)(op-(BYTE*)dst), (unsigned)length){};

          /* decode literal length */
          if (length == RUN_MASK((1U<<(8-4))-1)) {
15
←
Assuming the condition is false→
16
←
Taking false branch→
              size_t const addl = read_variable_length(&ip, iend-RUN_MASK((1U<<(8-4))-1), 1);
              if (addl == rvl_error) {
                  DEBUGLOG(6, "error reading long literal length"){};
                  goto _output_error;
              }
              length += addl;
              if (unlikely((uptrval)(op)+length<(uptrval)(op))(__builtin_expect ((((uptrval)(op)+length<(uptrval)(op)) !=
 0),(0)) )) { goto _output_error; } /* overflow detection */
              if (unlikely((uptrval)(ip)+length<(uptrval)(ip))(__builtin_expect ((((uptrval)(ip)+length<(uptrval)(ip)) !=
 0),(0)) )) { goto _output_error; } /* overflow detection */

              /* copy literals */
              LZ4_STATIC_ASSERT(MFLIMIT >= WILDCOPYLENGTH){ enum { LZ4_static_assert = 1/(int)(!!(12 >= 8)) }; };
              if ((op+length>oend-32) || (ip+length>iend-32)) { goto safe_literal_copy; }
              LZ4_wildCopy32(op, ip, op+length);
              ip += length; op += length;
          } else if (ip <= iend-(16 + 1/*max lit + offset + nextToken*/)) {
17
←
Assuming the condition is true→
18
←
Taking true branch→
              /* We don't need to check oend, since we check it once for each loop below */
              DEBUGLOG(7, "copy %u bytes in a 16-bytes stripe", (unsigned)length){};
              /* Literals can only be <= 14, but hope compilers optimize better when copy by a register size */
              LZ4_memcpy(op, ip, 16)__builtin_memcpy(op, ip, 16);
              ip += length; op += length;
          } else {
              goto safe_literal_copy;
          }

          /* get offset */
          offset = LZ4_readLE16(ip); ip+=2;
          DEBUGLOG(6, "blockPos%6u: offset = %u", (unsigned)(op-(BYTE*)dst), (unsigned)offset){};
          match = op - offset;
          assert(match <= op)((void)0);  /* overflow check */

          /* get matchlength */
          length = token & ML_MASK((1U<<4)-1);
          DEBUGLOG(7, "  match length token = %u (len==%u)", (unsigned)length, (unsigned)length+MINMATCH){};

          if (length == ML_MASK((1U<<4)-1)) {
19
←
Assuming the condition is false→
20
←
Taking false branch→
              size_t const addl = read_variable_length(&ip, iend - LASTLITERALS5 + 1, 0);
              if (addl == rvl_error) {
                  DEBUGLOG(5, "error reading long match length"){};
                  goto _output_error;
              }
              length += addl;
              length += MINMATCH4;
              DEBUGLOG(7, "  long match length == %u", (unsigned)length){};
              if (unlikely((uptrval)(op)+length<(uptrval)op)(__builtin_expect ((((uptrval)(op)+length<(uptrval)op) != 0
),(0)) )) { goto _output_error; } /* overflow detection */
              if (op + length >= oend - FASTLOOP_SAFE_DISTANCE64) {
                  goto safe_match_copy;
              }
          } else {
              length += MINMATCH4;
              if (op + length >= oend - FASTLOOP_SAFE_DISTANCE64) {
21
←
Assuming the condition is false→
                  DEBUGLOG(7, "moving to safe_match_copy (ml==%u)", (unsigned)length){};
                  goto safe_match_copy;
              }

              /* Fastpath check: skip LZ4_wildCopy32 when true */
              if ((dict == withPrefix64k) || (match >= lowPrefix)) {
22
←
Assuming 'dict' is not equal to withPrefix64k→
23
←
Assuming 'match' is < 'lowPrefix'→
                  if (offset >= 8) {
                      assert(match >= lowPrefix)((void)0);
                      assert(match <= op)((void)0);
                      assert(op + 18 <= oend)((void)0);

                      LZ4_memcpy(op, match, 8)__builtin_memcpy(op, match, 8);
                      LZ4_memcpy(op+8, match+8, 8)__builtin_memcpy(op+8, match+8, 8);
                      LZ4_memcpy(op+16, match+16, 2)__builtin_memcpy(op+16, match+16, 2);
                      op += length;
                      continue;
          }   }   }

          if ( checkOffset23.1
'checkOffset' is 0
 && (unlikely(match + dictSize < lowPrefix)(__builtin_expect (((match + dictSize < lowPrefix) != 0),(
0)) )) ) {
              DEBUGLOG(5, "Error : pos=%zi, offset=%zi => outside buffers", op-lowPrefix, op-match){};
              goto _output_error;
          }
          /* match starting within external dictionary */
          if ((dict==usingExtDict) && (match < lowPrefix)) {
24
←
Assuming 'dict' is equal to usingExtDict→
25
←
Assuming 'match' is < 'lowPrefix'→
26
←
Taking true branch→
              assert(dictEnd != NULL)((void)0);
              if (unlikely(op+length > oend-LASTLITERALS)(__builtin_expect (((op+length > oend-5) != 0),(0)) )) {
27
←
Assuming the condition is false→
28
←
Taking false branch→
                  if (partialDecoding) {
                      DEBUGLOG(7, "partialDecoding: dictionary match, close to dstEnd"){};
                      length = MIN(length, (size_t)(oend-op))( (length) < ((size_t)(oend-op)) ? (length) : ((size_t)(oend
-op)) );
                  } else {
                      DEBUGLOG(6, "end-of-block condition violated"){}
                      goto _output_error;
              }   }

              if (length <= (size_t)(lowPrefix-match)) {
29
←
Assuming the condition is false→
30
←
Taking false branch→
                  /* match fits entirely within external dictionary : just copy */
                  LZ4_memmove__builtin_memmove(op, dictEnd - (lowPrefix-match), length);
                  op += length;
              } else {
                  /* match stretches into both external dictionary and current block */
                  size_t const copySize = (size_t)(lowPrefix - match);
                  size_t const restSize = length - copySize;
                  LZ4_memcpy(op, dictEnd - copySize, copySize)__builtin_memcpy(op, dictEnd - copySize, copySize);
31
←
Null pointer passed as 2nd argument to memory copy function
                  op += copySize;
                  if (restSize > (size_t)(op - lowPrefix)) {  /* overlap copy */
                      BYTE* const endOfMatch = op + restSize;
                      const BYTE* copyFrom = lowPrefix;
                      while (op < endOfMatch) { *op++ = *copyFrom++; }
                  } else {
                      LZ4_memcpy(op, lowPrefix, restSize)__builtin_memcpy(op, lowPrefix, restSize);
                      op += restSize;
              }   }
              continue;
          }

          /* copy match within block */
          cpy = op + length;

          assert((op <= oend) && (oend-op >= 32))((void)0);
          if (unlikely(offset<16)(__builtin_expect (((offset<16) != 0),(0)) )) {
              LZ4_memcpy_using_offset(op, match, cpy, offset);
          } else {
              LZ4_wildCopy32(op, match, cpy);
          }

          op = cpy;   /* wildcopy correction */
      }
  safe_decode:
2211#endif

      /* Main Loop : decode remaining sequences where output < FASTLOOP_SAFE_DISTANCE */
      DEBUGLOG(6, "using safe decode loop"){};
      while (1) {
          assert(ip < iend)((void)0);
          token = *ip++;
          length = token >> ML_BITS4;  /* literal length */
          DEBUGLOG(7, "blockPos%6u: litLength token = %u", (unsigned)(op-(BYTE*)dst), (unsigned)length){};

          /* A two-stage shortcut for the most common case:
           * 1) If the literal length is 0..14, and there is enough space,
           * enter the shortcut and copy 16 bytes on behalf of the literals
           * (in the fast mode, only 8 bytes can be safely copied this way).
           * 2) Further if the match length is 4..18, copy 18 bytes in a similar
           * manner; but we ensure that there's enough space in the output for
           * those 18 bytes earlier, upon entering the shortcut (in other words,
           * there is a combined check for both stages).
           */
          if ( (length != RUN_MASK((1U<<(8-4))-1))
              /* strictly "less than" on input, to re-enter the loop with at least one byte */
            && likely((ip < shortiend) & (op <= shortoend))(__builtin_expect ((((ip < shortiend) & (op <= shortoend
)) != 0),(1)) ) ) {
              /* Copy the literals */
              LZ4_memcpy(op, ip, 16)__builtin_memcpy(op, ip, 16);
              op += length; ip += length;

              /* The second stage: prepare for match copying, decode full info.
               * If it doesn't work out, the info won't be wasted. */
              length = token & ML_MASK((1U<<4)-1); /* match length */
              DEBUGLOG(7, "blockPos%6u: matchLength token = %u (len=%u)", (unsigned)(op-(BYTE*)dst), (unsigned)length, (unsigned)length + 4){};
              offset = LZ4_readLE16(ip); ip += 2;
              match = op - offset;
              assert(match <= op)((void)0); /* check overflow */

              /* Do not deal with overlapping matches. */
              if ( (length != ML_MASK((1U<<4)-1))
                && (offset >= 8)
                && (dict==withPrefix64k || match >= lowPrefix) ) {
                  /* Copy the match. */
                  LZ4_memcpy(op + 0, match + 0, 8)__builtin_memcpy(op + 0, match + 0, 8);
                  LZ4_memcpy(op + 8, match + 8, 8)__builtin_memcpy(op + 8, match + 8, 8);
                  LZ4_memcpy(op +16, match +16, 2)__builtin_memcpy(op +16, match +16, 2);
                  op += length + MINMATCH4;
                  /* Both stages worked, load the next token. */
                  continue;
              }

              /* The second stage didn't work out, but the info is ready.
               * Propel it right to the point of match copying. */
              goto _copy_match;
          }

          /* decode literal length */
          if (length == RUN_MASK((1U<<(8-4))-1)) {
              size_t const addl = read_variable_length(&ip, iend-RUN_MASK((1U<<(8-4))-1), 1);
              if (addl == rvl_error) { goto _output_error; }
              length += addl;
              if (unlikely((uptrval)(op)+length<(uptrval)(op))(__builtin_expect ((((uptrval)(op)+length<(uptrval)(op)) !=
 0),(0)) )) { goto _output_error; } /* overflow detection */
              if (unlikely((uptrval)(ip)+length<(uptrval)(ip))(__builtin_expect ((((uptrval)(ip)+length<(uptrval)(ip)) !=
 0),(0)) )) { goto _output_error; } /* overflow detection */
          }

2272#if LZ4_FAST_DEC_LOOP1
      safe_literal_copy:
2274#endif
          /* copy literals */
          cpy = op+length;

          LZ4_STATIC_ASSERT(MFLIMIT >= WILDCOPYLENGTH){ enum { LZ4_static_assert = 1/(int)(!!(12 >= 8)) }; };
          if ((cpy>oend-MFLIMIT12) || (ip+length>iend-(2+1+LASTLITERALS5))) {
              /* We've either hit the input parsing restriction or the output parsing restriction.
               * In the normal scenario, decoding a full block, it must be the last sequence,
               * otherwise it's an error (invalid input or dimensions).
               * In partialDecoding scenario, it's necessary to ensure there is no buffer overflow.
               */
              if (partialDecoding) {
                  /* Since we are partial decoding we may be in this block because of the output parsing
                   * restriction, which is not valid since the output buffer is allowed to be undersized.
                   */
                  DEBUGLOG(7, "partialDecoding: copying literals, close to input or output end"){}
                  DEBUGLOG(7, "partialDecoding: literal length = %u", (unsigned)length){};
                  DEBUGLOG(7, "partialDecoding: remaining space in dstBuffer : %i", (int)(oend - op)){};
                  DEBUGLOG(7, "partialDecoding: remaining space in srcBuffer : %i", (int)(iend - ip)){};
                  /* Finishing in the middle of a literals segment,
                   * due to lack of input.
                   */
                  if (ip+length > iend) {
                      length = (size_t)(iend-ip);
                      cpy = op + length;
                  }
                  /* Finishing in the middle of a literals segment,
                   * due to lack of output space.
                   */
                  if (cpy > oend) {
                      cpy = oend;
                      assert(op<=oend)((void)0);
                      length = (size_t)(oend-op);
                  }
              } else {
                   /* We must be on the last sequence (or invalid) because of the parsing limitations
                    * so check that we exactly consume the input and don't overrun the output buffer.
                    */
                  if ((ip+length != iend) || (cpy > oend)) {
                      DEBUGLOG(5, "should have been last run of literals"){}
                      DEBUGLOG(5, "ip(%p) + length(%i) = %p != iend (%p)", ip, (int)length, ip+length, iend){};
                      DEBUGLOG(5, "or cpy(%p) > (oend-MFLIMIT)(%p)", cpy, oend-MFLIMIT){};
                      DEBUGLOG(5, "after writing %u bytes / %i bytes available", (unsigned)(op-(BYTE*)dst), outputSize){};
                      goto _output_error;
                  }
              }
              LZ4_memmove__builtin_memmove(op, ip, length);  /* supports overlapping memory regions, for in-place decompression scenarios */
              ip += length;
              op += length;
              /* Necessarily EOF when !partialDecoding.
               * When partialDecoding, it is EOF if we've either
               * filled the output buffer or
               * can't proceed with reading an offset for following match.
               */
              if (!partialDecoding || (cpy == oend) || (ip >= (iend-2))) {
                  break;
              }
          } else {
              LZ4_wildCopy8(op, ip, cpy);   /* can overwrite up to 8 bytes beyond cpy */
              ip += length; op = cpy;
          }

          /* get offset */
          offset = LZ4_readLE16(ip); ip+=2;
          match = op - offset;

          /* get matchlength */
          length = token & ML_MASK((1U<<4)-1);
          DEBUGLOG(7, "blockPos%6u: matchLength token = %u", (unsigned)(op-(BYTE*)dst), (unsigned)length){};

  _copy_match:
          if (length == ML_MASK((1U<<4)-1)) {
              size_t const addl = read_variable_length(&ip, iend - LASTLITERALS5 + 1, 0);
              if (addl == rvl_error) { goto _output_error; }
              length += addl;
              if (unlikely((uptrval)(op)+length<(uptrval)op)(__builtin_expect ((((uptrval)(op)+length<(uptrval)op) != 0
),(0)) )) goto _output_error;   /* overflow detection */
          }
          length += MINMATCH4;

2353#if LZ4_FAST_DEC_LOOP1
      safe_match_copy:
2355#endif
          if ((checkOffset) && (unlikely(match + dictSize < lowPrefix)(__builtin_expect (((match + dictSize < lowPrefix) != 0),(
0)) ))) goto _output_error;   /* Error : offset outside buffers */
          /* match starting within external dictionary */
          if ((dict==usingExtDict) && (match < lowPrefix)) {
              assert(dictEnd != NULL)((void)0);
              if (unlikely(op+length > oend-LASTLITERALS)(__builtin_expect (((op+length > oend-5) != 0),(0)) )) {
                  if (partialDecoding) length = MIN(length, (size_t)(oend-op))( (length) < ((size_t)(oend-op)) ? (length) : ((size_t)(oend
-op)) );
                  else goto _output_error;   /* doesn't respect parsing restriction */
              }

              if (length <= (size_t)(lowPrefix-match)) {
                  /* match fits entirely within external dictionary : just copy */
                  LZ4_memmove__builtin_memmove(op, dictEnd - (lowPrefix-match), length);
                  op += length;
              } else {
                  /* match stretches into both external dictionary and current block */
                  size_t const copySize = (size_t)(lowPrefix - match);
                  size_t const restSize = length - copySize;
                  LZ4_memcpy(op, dictEnd - copySize, copySize)__builtin_memcpy(op, dictEnd - copySize, copySize);
                  op += copySize;
                  if (restSize > (size_t)(op - lowPrefix)) {  /* overlap copy */
                      BYTE* const endOfMatch = op + restSize;
                      const BYTE* copyFrom = lowPrefix;
                      while (op < endOfMatch) *op++ = *copyFrom++;
                  } else {
                      LZ4_memcpy(op, lowPrefix, restSize)__builtin_memcpy(op, lowPrefix, restSize);
                      op += restSize;
              }   }
              continue;
          }
          assert(match >= lowPrefix)((void)0);

          /* copy match within block */
          cpy = op + length;

          /* partialDecoding : may end anywhere within the block */
          assert(op<=oend)((void)0);
          if (partialDecoding && (cpy > oend-MATCH_SAFEGUARD_DISTANCE((2*8) - 4))) {
              size_t const mlen = MIN(length, (size_t)(oend-op))( (length) < ((size_t)(oend-op)) ? (length) : ((size_t)(oend
-op)) );
              const BYTE* const matchEnd = match + mlen;
              BYTE* const copyEnd = op + mlen;
              if (matchEnd > op) {   /* overlap copy */
                  while (op < copyEnd) { *op++ = *match++; }
              } else {
                  LZ4_memcpy(op, match, mlen)__builtin_memcpy(op, match, mlen);
              }
              op = copyEnd;
              if (op == oend) { break; }
              continue;
          }

          if (unlikely(offset<8)(__builtin_expect (((offset<8) != 0),(0)) )) {
              LZ4_write32(op, 0);   /* silence msan warning when offset==0 */
              op[0] = match[0];
              op[1] = match[1];
              op[2] = match[2];
              op[3] = match[3];
              match += inc32table[offset];
              LZ4_memcpy(op+4, match, 4)__builtin_memcpy(op+4, match, 4);
              match -= dec64table[offset];
          } else {
              LZ4_memcpy(op, match, 8)__builtin_memcpy(op, match, 8);
              match += 8;
          }
          op += 8;

          if (unlikely(cpy > oend-MATCH_SAFEGUARD_DISTANCE)(__builtin_expect (((cpy > oend-((2*8) - 4)) != 0),(0)) )) {
              BYTE* const oCopyLimit = oend - (WILDCOPYLENGTH8-1);
              if (cpy > oend-LASTLITERALS5) { goto _output_error; } /* Error : last LASTLITERALS bytes must be literals (uncompressed) */
              if (op < oCopyLimit) {
                  LZ4_wildCopy8(op, match, oCopyLimit);
                  match += oCopyLimit - op;
                  op = oCopyLimit;
              }
              while (op < cpy) { *op++ = *match++; }
          } else {
              LZ4_memcpy(op, match, 8)__builtin_memcpy(op, match, 8);
              if (length > 16) { LZ4_wildCopy8(op+8, match+8, cpy); }
          }
          op = cpy;   /* wildcopy correction */
      }

      /* end of decoding */
      DEBUGLOG(5, "decoded %i bytes", (int) (((char*)op)-dst)){};
      return (int) (((char*)op)-dst);     /* Nb of output bytes decoded */

      /* Overflow error detected */
  _output_error:
      return (int) (-(((const char*)ip)-src))-1;
  }
2445}


2448/*===== Instantiate the API decoding functions. =====*/

2450LZ4_FORCE_O2
2451int LZ4_decompress_safe(const char* source, char* dest, int compressedSize, int maxDecompressedSize)
2452{
  return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize,
                                decode_full_block, noDict,
                                (BYTE*)dest, NULL((void*)0), 0);
2456}

2458LZ4_FORCE_O2
2459int LZ4_decompress_safe_partial(const char* src, char* dst, int compressedSize, int targetOutputSize, int dstCapacity)
2460{
  dstCapacity = MIN(targetOutputSize, dstCapacity)( (targetOutputSize) < (dstCapacity) ? (targetOutputSize) :
 (dstCapacity) );
  return LZ4_decompress_generic(src, dst, compressedSize, dstCapacity,
                                partial_decode,
                                noDict, (BYTE*)dst, NULL((void*)0), 0);
2465}

2467LZ4_FORCE_O2
2468int LZ4_decompress_fast(const char* source, char* dest, int originalSize)
2469{
  DEBUGLOG(5, "LZ4_decompress_fast"){};
  return LZ4_decompress_unsafe_generic(
              (const BYTE*)source, (BYTE*)dest, originalSize,
              0, NULL((void*)0), 0);
2474}

2476/*===== Instantiate a few more decoding cases, used more than once. =====*/

2478LZ4_FORCE_O2 /* Exported, an obsolete API function. */
2479int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int compressedSize, int maxOutputSize)
2480{
  return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize,
                                decode_full_block, withPrefix64k,
                                (BYTE*)dest - 64 KB*(1 <<10), NULL((void*)0), 0);
2484}

2486LZ4_FORCE_O2
2487static int LZ4_decompress_safe_partial_withPrefix64k(const char* source, char* dest, int compressedSize, int targetOutputSize, int dstCapacity)
2488{
  dstCapacity = MIN(targetOutputSize, dstCapacity)( (targetOutputSize) < (dstCapacity) ? (targetOutputSize) :
 (dstCapacity) );
  return LZ4_decompress_generic(source, dest, compressedSize, dstCapacity,
                                partial_decode, withPrefix64k,
                                (BYTE*)dest - 64 KB*(1 <<10), NULL((void*)0), 0);
2493}

2495/* Another obsolete API function, paired with the previous one. */
2496int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int originalSize)
2497{
  return LZ4_decompress_unsafe_generic(
              (const BYTE*)source, (BYTE*)dest, originalSize,
              64 KB*(1 <<10), NULL((void*)0), 0);
2501}

2503LZ4_FORCE_O2
2504static int LZ4_decompress_safe_withSmallPrefix(const char* source, char* dest, int compressedSize, int maxOutputSize,
                                             size_t prefixSize)
2506{
  return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize,
                                decode_full_block, noDict,
                                (BYTE*)dest-prefixSize, NULL((void*)0), 0);
2510}

2512LZ4_FORCE_O2
2513static int LZ4_decompress_safe_partial_withSmallPrefix(const char* source, char* dest, int compressedSize, int targetOutputSize, int dstCapacity,
                                             size_t prefixSize)
2515{
  dstCapacity = MIN(targetOutputSize, dstCapacity)( (targetOutputSize) < (dstCapacity) ? (targetOutputSize) :
 (dstCapacity) );
  return LZ4_decompress_generic(source, dest, compressedSize, dstCapacity,
                                partial_decode, noDict,
                                (BYTE*)dest-prefixSize, NULL((void*)0), 0);
2520}

2522LZ4_FORCE_O2
2523int LZ4_decompress_safe_forceExtDict(const char* source, char* dest,
                                   int compressedSize, int maxOutputSize,
                                   const void* dictStart, size_t dictSize)
2526{
  DEBUGLOG(5, "LZ4_decompress_safe_forceExtDict"){};
  return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize,
                                decode_full_block, usingExtDict,
                                (BYTE*)dest, (const BYTE*)dictStart, dictSize);
2531}

2533LZ4_FORCE_O2
2534int LZ4_decompress_safe_partial_forceExtDict(const char* source, char* dest,
                                   int compressedSize, int targetOutputSize, int dstCapacity,
                                   const void* dictStart, size_t dictSize)
2537{
  dstCapacity = MIN(targetOutputSize, dstCapacity)( (targetOutputSize) < (dstCapacity) ? (targetOutputSize) :
 (dstCapacity) );
  return LZ4_decompress_generic(source, dest, compressedSize, dstCapacity,
                                partial_decode, usingExtDict,
                                (BYTE*)dest, (const BYTE*)dictStart, dictSize);
2542}

2544LZ4_FORCE_O2
2545static int LZ4_decompress_fast_extDict(const char* source, char* dest, int originalSize,
                                     const void* dictStart, size_t dictSize)
2547{
  return LZ4_decompress_unsafe_generic(
              (const BYTE*)source, (BYTE*)dest, originalSize,
              0, (const BYTE*)dictStart, dictSize);
2551}

2553/* The "double dictionary" mode, for use with e.g. ring buffers: the first part
* of the dictionary is passed as prefix, and the second via dictStart + dictSize.
* These routines are used only once, in LZ4_decompress_*_continue().
*/
2557LZ4_FORCE_INLINEstatic inline __attribute__((always_inline))
2558int LZ4_decompress_safe_doubleDict(const char* source, char* dest, int compressedSize, int maxOutputSize,
                                 size_t prefixSize, const void* dictStart, size_t dictSize)
2560{
  return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize,
                                decode_full_block, usingExtDict,
                                (BYTE*)dest-prefixSize, (const BYTE*)dictStart, dictSize);
2564}

2566/*===== streaming decompression functions =====*/

2568#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
2569LZ4_streamDecode_t* LZ4_createStreamDecode(void)
2570{
  LZ4_STATIC_ASSERT(sizeof(LZ4_streamDecode_t) >= sizeof(LZ4_streamDecode_t_internal)){ enum { LZ4_static_assert = 1/(int)(!!(sizeof(LZ4_streamDecode_t
) >= sizeof(LZ4_streamDecode_t_internal))) }; };
  return (LZ4_streamDecode_t*) ALLOC_AND_ZERO(sizeof(LZ4_streamDecode_t))calloc(1,sizeof(LZ4_streamDecode_t));
2573}

2575int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream)
2576{
  if (LZ4_stream == NULL((void*)0)) { return 0; }  /* support free on NULL */
  FREEMEM(LZ4_stream)free(LZ4_stream);
  return 0;
2580}
2581#endif

2583/*! LZ4_setStreamDecode() :
*  Use this function to instruct where to find the dictionary.
*  This function is not necessary if previous data is still available where it was decoded.
*  Loading a size of 0 is allowed (same effect as no dictionary).
* @return : 1 if OK, 0 if error
*/
2589int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize)
2590{
  LZ4_streamDecode_t_internal* lz4sd = &LZ4_streamDecode->internal_donotuse;
  lz4sd->prefixSize = (size_t)dictSize;
  if (dictSize) {
      assert(dictionary != NULL)((void)0);
      lz4sd->prefixEnd = (const BYTE*) dictionary + dictSize;
  } else {
      lz4sd->prefixEnd = (const BYTE*) dictionary;
  }
  lz4sd->externalDict = NULL((void*)0);
  lz4sd->extDictSize  = 0;
  return 1;
2602}

2604/*! LZ4_decoderRingBufferSize() :
*  when setting a ring buffer for streaming decompression (optional scenario),
*  provides the minimum size of this ring buffer
*  to be compatible with any source respecting maxBlockSize condition.
*  Note : in a ring buffer scenario,
*  blocks are presumed decompressed next to each other.
*  When not enough space remains for next block (remainingSize < maxBlockSize),
*  decoding resumes from beginning of ring buffer.
* @return : minimum ring buffer size,
*           or 0 if there is an error (invalid maxBlockSize).
*/
2615int LZ4_decoderRingBufferSize(int maxBlockSize)
2616{
  if (maxBlockSize < 0) return 0;
  if (maxBlockSize > LZ4_MAX_INPUT_SIZE0x7E000000) return 0;
  if (maxBlockSize < 16) maxBlockSize = 16;
  return LZ4_DECODER_RING_BUFFER_SIZE(maxBlockSize)(65536 + 14 + (maxBlockSize));
2621}

2623/*
2624*_continue() :
  These decoding functions allow decompression of multiple blocks in "streaming" mode.
  Previously decoded blocks must still be available at the memory position where they were decoded.
  If it's not possible, save the relevant part of decoded data into a safe buffer,
  and indicate where it stands using LZ4_setStreamDecode()
2629*/
2630LZ4_FORCE_O2
2631int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize)
2632{
  LZ4_streamDecode_t_internal* lz4sd = &LZ4_streamDecode->internal_donotuse;
  int result;

  if (lz4sd->prefixSize == 0) {
      /* The first call, no dictionary yet. */
      assert(lz4sd->extDictSize == 0)((void)0);
      result = LZ4_decompress_safe(source, dest, compressedSize, maxOutputSize);
      if (result <= 0) return result;
      lz4sd->prefixSize = (size_t)result;
      lz4sd->prefixEnd = (BYTE*)dest + result;
  } else if (lz4sd->prefixEnd == (BYTE*)dest) {
      /* They're rolling the current segment. */
      if (lz4sd->prefixSize >= 64 KB*(1 <<10) - 1)
          result = LZ4_decompress_safe_withPrefix64k(source, dest, compressedSize, maxOutputSize);
      else if (lz4sd->extDictSize == 0)
          result = LZ4_decompress_safe_withSmallPrefix(source, dest, compressedSize, maxOutputSize,
                                                       lz4sd->prefixSize);
      else
          result = LZ4_decompress_safe_doubleDict(source, dest, compressedSize, maxOutputSize,
                                                  lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize);
      if (result <= 0) return result;
      lz4sd->prefixSize += (size_t)result;
      lz4sd->prefixEnd  += result;
  } else {
      /* The buffer wraps around, or they're switching to another buffer. */
      lz4sd->extDictSize = lz4sd->prefixSize;
      lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize;
      result = LZ4_decompress_safe_forceExtDict(source, dest, compressedSize, maxOutputSize,
                                                lz4sd->externalDict, lz4sd->extDictSize);
      if (result <= 0) return result;
      lz4sd->prefixSize = (size_t)result;
      lz4sd->prefixEnd  = (BYTE*)dest + result;
  }

  return result;
2668}

2670LZ4_FORCE_O2 int
2671LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode,
                      const char* source, char* dest, int originalSize)
2673{
  LZ4_streamDecode_t_internal* const lz4sd =
      (assert(LZ4_streamDecode!=NULL)((void)0), &LZ4_streamDecode->internal_donotuse);
  int result;

  DEBUGLOG(5, "LZ4_decompress_fast_continue (toDecodeSize=%i)", originalSize){};
  assert(originalSize >= 0)((void)0);

  if (lz4sd->prefixSize == 0) {
      DEBUGLOG(5, "first invocation : no prefix nor extDict"){};
      assert(lz4sd->extDictSize == 0)((void)0);
      result = LZ4_decompress_fast(source, dest, originalSize);
      if (result <= 0) return result;
      lz4sd->prefixSize = (size_t)originalSize;
      lz4sd->prefixEnd = (BYTE*)dest + originalSize;
  } else if (lz4sd->prefixEnd == (BYTE*)dest) {
      DEBUGLOG(5, "continue using existing prefix"){};
      result = LZ4_decompress_unsafe_generic(
                      (const BYTE*)source, (BYTE*)dest, originalSize,
                      lz4sd->prefixSize,
                      lz4sd->externalDict, lz4sd->extDictSize);
      if (result <= 0) return result;
      lz4sd->prefixSize += (size_t)originalSize;
      lz4sd->prefixEnd  += originalSize;
  } else {
      DEBUGLOG(5, "prefix becomes extDict"){};
      lz4sd->extDictSize = lz4sd->prefixSize;
      lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize;
      result = LZ4_decompress_fast_extDict(source, dest, originalSize,
                                           lz4sd->externalDict, lz4sd->extDictSize);
      if (result <= 0) return result;
      lz4sd->prefixSize = (size_t)originalSize;
      lz4sd->prefixEnd  = (BYTE*)dest + originalSize;
  }

  return result;
2709}


2712/*
2713Advanced decoding functions :
2714*_usingDict() :
  These decoding functions work the same as "_continue" ones,
  the dictionary must be explicitly provided within parameters
2717*/

2719int LZ4_decompress_safe_usingDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize)
2720{
  if (dictSize==0)
      return LZ4_decompress_safe(source, dest, compressedSize, maxOutputSize);
  if (dictStart+dictSize == dest) {
      if (dictSize >= 64 KB*(1 <<10) - 1) {
          return LZ4_decompress_safe_withPrefix64k(source, dest, compressedSize, maxOutputSize);
      }
      assert(dictSize >= 0)((void)0);
      return LZ4_decompress_safe_withSmallPrefix(source, dest, compressedSize, maxOutputSize, (size_t)dictSize);
  }
  assert(dictSize >= 0)((void)0);
  return LZ4_decompress_safe_forceExtDict(source, dest, compressedSize, maxOutputSize, dictStart, (size_t)dictSize);
2732}

2734int LZ4_decompress_safe_partial_usingDict(const char* source, char* dest, int compressedSize, int targetOutputSize, int dstCapacity, const char* dictStart, int dictSize)
2735{
  if (dictSize==0)
      return LZ4_decompress_safe_partial(source, dest, compressedSize, targetOutputSize, dstCapacity);
  if (dictStart+dictSize == dest) {
      if (dictSize >= 64 KB*(1 <<10) - 1) {
          return LZ4_decompress_safe_partial_withPrefix64k(source, dest, compressedSize, targetOutputSize, dstCapacity);
      }
      assert(dictSize >= 0)((void)0);
      return LZ4_decompress_safe_partial_withSmallPrefix(source, dest, compressedSize, targetOutputSize, dstCapacity, (size_t)dictSize);
  }
  assert(dictSize >= 0)((void)0);
  return LZ4_decompress_safe_partial_forceExtDict(source, dest, compressedSize, targetOutputSize, dstCapacity, dictStart, (size_t)dictSize);
2747}

2749int LZ4_decompress_fast_usingDict(const char* source, char* dest, int originalSize, const char* dictStart, int dictSize)
2750{
  if (dictSize==0 || dictStart+dictSize == dest)
      return LZ4_decompress_unsafe_generic(
                      (const BYTE*)source, (BYTE*)dest, originalSize,
                      (size_t)dictSize, NULL((void*)0), 0);
  assert(dictSize >= 0)((void)0);
  return LZ4_decompress_fast_extDict(source, dest, originalSize, dictStart, (size_t)dictSize);
2757}


2760/*=*************************************************
2761*  Obsolete Functions
2762***************************************************/
2763/* obsolete compression functions */
2764int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
2765{
  return LZ4_compress_default(source, dest, inputSize, maxOutputSize);
2767}
2768int LZ4_compress(const char* src, char* dest, int srcSize)
2769{
  return LZ4_compress_default(src, dest, srcSize, LZ4_compressBound(srcSize));
2771}
2772int LZ4_compress_limitedOutput_withState (void* state, const char* src, char* dst, int srcSize, int dstSize)
2773{
  return LZ4_compress_fast_extState(state, src, dst, srcSize, dstSize, 1);
2775}
2776int LZ4_compress_withState (void* state, const char* src, char* dst, int srcSize)
2777{
  return LZ4_compress_fast_extState(state, src, dst, srcSize, LZ4_compressBound(srcSize), 1);
2779}
2780int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* src, char* dst, int srcSize, int dstCapacity)
2781{
  return LZ4_compress_fast_continue(LZ4_stream, src, dst, srcSize, dstCapacity, 1);
2783}
2784int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize)
2785{
  return LZ4_compress_fast_continue(LZ4_stream, source, dest, inputSize, LZ4_compressBound(inputSize), 1);
2787}

2789/*
2790These decompression functions are deprecated and should no longer be used.
2791They are only provided here for compatibility with older user programs.
2792- LZ4_uncompress is totally equivalent to LZ4_decompress_fast
2793- LZ4_uncompress_unknownOutputSize is totally equivalent to LZ4_decompress_safe
2794*/
2795int LZ4_uncompress (const char* source, char* dest, int outputSize)
2796{
  return LZ4_decompress_fast(source, dest, outputSize);
2798}
2799int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize)
2800{
  return LZ4_decompress_safe(source, dest, isize, maxOutputSize);
2802}

2804/* Obsolete Streaming functions */

2806int LZ4_sizeofStreamState(void) { return sizeof(LZ4_stream_t); }

2808int LZ4_resetStreamState(void* state, char* inputBuffer)
2809{
  (void)inputBuffer;
  LZ4_resetStream((LZ4_stream_t*)state);
  return 0;
2813}

2815#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
2816void* LZ4_create (char* inputBuffer)
2817{
  (void)inputBuffer;
  return LZ4_createStream();
2820}
2821#endif

2823char* LZ4_slideInputBuffer (void* state)
2824{
  /* avoid const char * -> char * conversion warning */
  return (char *)(uptrval)((LZ4_stream_t*)state)->internal_donotuse.dictionary;
2827}

2829#endif   /* LZ4_COMMONDEFS_ONLY */