| File: | root/firefox-clang/obj-x86_64-pc-linux-gnu/third_party/abseil-cpp/absl/strings/strings_gn/./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc |
| Warning: | line 603, column 7 Value stored to 'szdest' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | // Copyright 2017 The Abseil Authors. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | #include "absl/strings/escaping.h" |
| 16 | |
| 17 | #include <algorithm> |
| 18 | #include <array> |
| 19 | #include <cassert> |
| 20 | #include <cstddef> |
| 21 | #include <cstdint> |
| 22 | #include <cstring> |
| 23 | #include <iterator> |
| 24 | #include <limits> |
| 25 | #include <optional> |
| 26 | #include <string> |
| 27 | #include <utility> |
| 28 | |
| 29 | #include "absl/base/config.h" |
| 30 | #include "absl/base/internal/endian.h" |
| 31 | #include "absl/base/internal/raw_logging.h" |
| 32 | #include "absl/base/internal/unaligned_access.h" |
| 33 | #include "absl/base/macros.h" |
| 34 | #include "absl/base/nullability.h" |
| 35 | #include "absl/base/optimization.h" |
| 36 | #include "absl/strings/ascii.h" |
| 37 | #include "absl/strings/charset.h" |
| 38 | #include "absl/strings/internal/append_and_overwrite.h" |
| 39 | #include "absl/strings/internal/escaping.h" |
| 40 | #include "absl/strings/internal/utf8.h" |
| 41 | #include "absl/strings/numbers.h" |
| 42 | #include "absl/strings/resize_and_overwrite.h" |
| 43 | #include "absl/strings/str_cat.h" |
| 44 | #include "absl/strings/string_view.h" |
| 45 | |
| 46 | namespace absl { |
| 47 | ABSL_NAMESPACE_BEGIN |
| 48 | namespace { |
| 49 | |
| 50 | // These are used for the leave_nulls_escaped argument to CUnescapeInternal(). |
| 51 | constexpr bool kUnescapeNulls = false; |
| 52 | |
| 53 | inline bool is_octal_digit(char c) { return ('0' <= c) && (c <= '7'); } |
| 54 | |
| 55 | inline unsigned int hex_digit_to_int(char c) { |
| 56 | static_assert('0' == 0x30 && 'A' == 0x41 && 'a' == 0x61, |
| 57 | "Character set must be ASCII."); |
| 58 | assert(absl::ascii_isxdigit(static_cast<unsigned char>(c)))(static_cast <bool> (absl::ascii_isxdigit(static_cast< unsigned char>(c))) ? void (0) : __assert_fail ("absl::ascii_isxdigit(static_cast<unsigned char>(c))" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); |
| 59 | unsigned int x = static_cast<unsigned char>(c); |
| 60 | if (x > '9') { |
| 61 | x += 9; |
| 62 | } |
| 63 | return x & 0xf; |
| 64 | } |
| 65 | |
| 66 | inline char int_to_hex_digit(int i) { |
| 67 | assert(i >= 0 && i <= 15)(static_cast <bool> (i >= 0 && i <= 15) ? void (0) : __assert_fail ("i >= 0 && i <= 15", __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); |
| 68 | return ((i < 10) ? (static_cast<char>(i) + '0') |
| 69 | : (static_cast<char>(i - 10) + 'A')); |
| 70 | } |
| 71 | |
| 72 | inline bool IsSurrogate(char32_t c, absl::string_view src, |
| 73 | std::string* absl_nullable error) { |
| 74 | if (c >= 0xD800 && c <= 0xDFFF) { |
| 75 | if (error) { |
| 76 | *error = absl::StrCat("invalid surrogate character (0xD800-DFFF): \\", |
| 77 | src); |
| 78 | } |
| 79 | return true; |
| 80 | } |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | // ---------------------------------------------------------------------- |
| 85 | // CUnescapeInternal() |
| 86 | // Implements both CUnescape() and CUnescapeForNullTerminatedString(). |
| 87 | // |
| 88 | // Unescapes C escape sequences and is the reverse of CEscape(). |
| 89 | // |
| 90 | // If `src` is valid, stores the unescaped string in `dst` and the length of |
| 91 | // unescaped string in `dst_size`, and returns true. Otherwise returns false |
| 92 | // and optionally stores the error description in `error`. Set `error` to |
| 93 | // nullptr to disable error reporting. |
| 94 | // |
| 95 | // `src` and `dst` may use the same underlying buffer (but keep in mind |
| 96 | // that if this returns an error, it will leave both `src` and `dst` in |
| 97 | // an unspecified state because they are using the same underlying buffer.) |
| 98 | // `dst` must have at least as much space as `src`. |
| 99 | // ---------------------------------------------------------------------- |
| 100 | |
| 101 | bool CUnescapeInternal(absl::string_view src, bool leave_nulls_escaped, |
| 102 | char* absl_nonnull dst, size_t* absl_nonnull dst_size, |
| 103 | std::string* absl_nullable error) { |
| 104 | absl::string_view::size_type p = 0; // Current src position. |
| 105 | size_t d = 0; // Current dst position. |
| 106 | |
| 107 | // When unescaping in-place, skip any prefix that does not have escaping. |
| 108 | if (src.data() == dst) { |
| 109 | while (p < src.size() && src[p] != '\\') p++, d++; |
| 110 | } |
| 111 | |
| 112 | while (p < src.size()) { |
| 113 | if (src[p] != '\\') { |
| 114 | dst[d++] = src[p++]; |
| 115 | } else { |
| 116 | if (++p >= src.size()) { // skip past the '\\' |
| 117 | if (error != nullptr) { |
| 118 | *error = "String cannot end with \\"; |
| 119 | } |
| 120 | return false; |
| 121 | } |
| 122 | switch (src[p]) { |
| 123 | // clang-format off |
| 124 | case 'a': dst[d++] = '\a'; break; |
| 125 | case 'b': dst[d++] = '\b'; break; |
| 126 | case 'f': dst[d++] = '\f'; break; |
| 127 | case 'n': dst[d++] = '\n'; break; |
| 128 | case 'r': dst[d++] = '\r'; break; |
| 129 | case 't': dst[d++] = '\t'; break; |
| 130 | case 'v': dst[d++] = '\v'; break; |
| 131 | case '\\': dst[d++] = '\\'; break; |
| 132 | case '?': dst[d++] = '\?'; break; |
| 133 | case '\'': dst[d++] = '\''; break; |
| 134 | case '"': dst[d++] = '\"'; break; |
| 135 | // clang-format on |
| 136 | case '0': |
| 137 | case '1': |
| 138 | case '2': |
| 139 | case '3': |
| 140 | case '4': |
| 141 | case '5': |
| 142 | case '6': |
| 143 | case '7': { |
| 144 | // octal digit: 1 to 3 digits |
| 145 | auto octal_start = p; |
| 146 | unsigned int ch = static_cast<unsigned int>(src[p] - '0'); // digit 1 |
| 147 | if (p + 1 < src.size() && is_octal_digit(src[p + 1])) |
| 148 | ch = ch * 8 + static_cast<unsigned int>(src[++p] - '0'); // digit 2 |
| 149 | if (p + 1 < src.size() && is_octal_digit(src[p + 1])) |
| 150 | ch = ch * 8 + static_cast<unsigned int>(src[++p] - '0'); // digit 3 |
| 151 | if (ch > 0xff) { |
| 152 | if (error != nullptr) { |
| 153 | *error = |
| 154 | "Value of \\" + |
| 155 | std::string(src.substr(octal_start, p + 1 - octal_start)) + |
| 156 | " exceeds 0xff"; |
| 157 | } |
| 158 | return false; |
| 159 | } |
| 160 | if ((ch == 0) && leave_nulls_escaped) { |
| 161 | // Copy the escape sequence for the null character |
| 162 | dst[d++] = '\\'; |
| 163 | while (octal_start <= p) { |
| 164 | dst[d++] = src[octal_start++]; |
| 165 | } |
| 166 | break; |
| 167 | } |
| 168 | dst[d++] = static_cast<char>(ch); |
| 169 | break; |
| 170 | } |
| 171 | case 'x': |
| 172 | case 'X': { |
| 173 | if (p + 1 >= src.size()) { |
| 174 | if (error != nullptr) { |
| 175 | *error = "String cannot end with \\x"; |
| 176 | } |
| 177 | return false; |
| 178 | } else if (!absl::ascii_isxdigit( |
| 179 | static_cast<unsigned char>(src[p + 1]))) { |
| 180 | if (error != nullptr) { |
| 181 | *error = "\\x cannot be followed by a non-hex digit"; |
| 182 | } |
| 183 | return false; |
| 184 | } |
| 185 | unsigned int ch = 0; |
| 186 | auto hex_start = p; |
| 187 | while (p + 1 < src.size() && |
| 188 | absl::ascii_isxdigit(static_cast<unsigned char>(src[p + 1]))) { |
| 189 | // Arbitrarily many hex digits |
| 190 | ch = (ch << 4) + hex_digit_to_int(src[++p]); |
| 191 | // If ch was 0xFF at the start of this loop, the most can it can be |
| 192 | // here is (0xFF << 4) + 0xF, which is 4095, thus ch cannot overflow |
| 193 | // 32-bits here. The check below is sufficient. |
| 194 | if (ch > 0xFF) { |
| 195 | if (error != nullptr) { |
| 196 | *error = "Value of \\" + |
| 197 | std::string(src.substr(hex_start, p + 1 - hex_start)) + |
| 198 | " exceeds 0xff"; |
| 199 | } |
| 200 | return false; |
| 201 | } |
| 202 | } |
| 203 | if ((ch == 0) && leave_nulls_escaped) { |
| 204 | // Copy the escape sequence for the null character |
| 205 | dst[d++] = '\\'; |
| 206 | while (hex_start <= p) { |
| 207 | dst[d++] = src[hex_start++]; |
| 208 | } |
| 209 | break; |
| 210 | } |
| 211 | dst[d++] = static_cast<char>(ch); |
| 212 | break; |
| 213 | } |
| 214 | case 'u': { |
| 215 | // \uhhhh => convert 4 hex digits to UTF-8 |
| 216 | char32_t rune = 0; |
| 217 | auto hex_start = p; |
| 218 | if (p + 4 >= src.size()) { |
| 219 | if (error != nullptr) { |
| 220 | *error = "\\u must be followed by 4 hex digits"; |
| 221 | } |
| 222 | return false; |
| 223 | } |
| 224 | for (int i = 0; i < 4; ++i) { |
| 225 | // Look one char ahead. |
| 226 | if (absl::ascii_isxdigit(static_cast<unsigned char>(src[p + 1]))) { |
| 227 | rune = (rune << 4) + hex_digit_to_int(src[++p]); |
| 228 | } else { |
| 229 | if (error != nullptr) { |
| 230 | *error = "\\u must be followed by 4 hex digits: \\" + |
| 231 | std::string(src.substr(hex_start, p + 1 - hex_start)); |
| 232 | } |
| 233 | return false; |
| 234 | } |
| 235 | } |
| 236 | if ((rune == 0) && leave_nulls_escaped) { |
| 237 | // Copy the escape sequence for the null character |
| 238 | dst[d++] = '\\'; |
| 239 | while (hex_start <= p) { |
| 240 | dst[d++] = src[hex_start++]; |
| 241 | } |
| 242 | break; |
| 243 | } |
| 244 | if (IsSurrogate(rune, src.substr(hex_start, 5), error)) { |
| 245 | return false; |
| 246 | } |
| 247 | d += strings_internal::EncodeUTF8Char(dst + d, rune); |
| 248 | break; |
| 249 | } |
| 250 | case 'U': { |
| 251 | // \Uhhhhhhhh => convert 8 hex digits to UTF-8 |
| 252 | char32_t rune = 0; |
| 253 | auto hex_start = p; |
| 254 | if (p + 8 >= src.size()) { |
| 255 | if (error != nullptr) { |
| 256 | *error = "\\U must be followed by 8 hex digits"; |
| 257 | } |
| 258 | return false; |
| 259 | } |
| 260 | for (int i = 0; i < 8; ++i) { |
| 261 | // Look one char ahead. |
| 262 | if (absl::ascii_isxdigit(static_cast<unsigned char>(src[p + 1]))) { |
| 263 | // Don't change rune until we're sure this |
| 264 | // is within the Unicode limit, but do advance p. |
| 265 | uint32_t newrune = (rune << 4) + hex_digit_to_int(src[++p]); |
| 266 | if (newrune > 0x10FFFF) { |
| 267 | if (error != nullptr) { |
| 268 | *error = |
| 269 | "Value of \\" + |
| 270 | std::string(src.substr(hex_start, p + 1 - hex_start)) + |
| 271 | " exceeds Unicode limit (0x10FFFF)"; |
| 272 | } |
| 273 | return false; |
| 274 | } else { |
| 275 | rune = newrune; |
| 276 | } |
| 277 | } else { |
| 278 | if (error != nullptr) { |
| 279 | *error = "\\U must be followed by 8 hex digits: \\" + |
| 280 | std::string(src.substr(hex_start, p + 1 - hex_start)); |
| 281 | } |
| 282 | return false; |
| 283 | } |
| 284 | } |
| 285 | if ((rune == 0) && leave_nulls_escaped) { |
| 286 | // Copy the escape sequence for the null character |
| 287 | dst[d++] = '\\'; |
| 288 | // U00000000 |
| 289 | while (hex_start <= p) { |
| 290 | dst[d++] = src[hex_start++]; |
| 291 | } |
| 292 | break; |
| 293 | } |
| 294 | if (IsSurrogate(rune, src.substr(hex_start, 9), error)) { |
| 295 | return false; |
| 296 | } |
| 297 | d += strings_internal::EncodeUTF8Char(dst + d, rune); |
| 298 | break; |
| 299 | } |
| 300 | default: { |
| 301 | if (error != nullptr) { |
| 302 | *error = std::string("Unknown escape sequence: \\") + src[p]; |
| 303 | } |
| 304 | return false; |
| 305 | } |
| 306 | } |
| 307 | p++; // Read past letter we escaped. |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | *dst_size = d; |
| 312 | return true; |
| 313 | } |
| 314 | |
| 315 | // ---------------------------------------------------------------------- |
| 316 | // CEscape() |
| 317 | // CHexEscape() |
| 318 | // Utf8SafeCEscape() |
| 319 | // Utf8SafeCHexEscape() |
| 320 | // Escapes 'src' using C-style escape sequences. This is useful for |
| 321 | // preparing query flags. The 'Hex' version uses hexadecimal rather than |
| 322 | // octal sequences. The 'Utf8Safe' version does not touch UTF-8 bytes. |
| 323 | // |
| 324 | // Escaped chars: \n, \r, \t, ", ', \, and !absl::ascii_isprint(). |
| 325 | // ---------------------------------------------------------------------- |
| 326 | std::string CEscapeInternal(absl::string_view src, bool use_hex, |
| 327 | bool utf8_safe) { |
| 328 | std::string dest; |
| 329 | bool last_hex_escape = false; // true if last output char was \xNN. |
| 330 | |
| 331 | for (char c : src) { |
| 332 | bool is_hex_escape = false; |
| 333 | switch (c) { |
| 334 | case '\n': dest.append("\\" "n"); break; |
| 335 | case '\r': dest.append("\\" "r"); break; |
| 336 | case '\t': dest.append("\\" "t"); break; |
| 337 | case '\"': dest.append("\\" "\""); break; |
| 338 | case '\'': dest.append("\\" "'"); break; |
| 339 | case '\\': dest.append("\\" "\\"); break; |
| 340 | default: { |
| 341 | // Note that if we emit \xNN and the src character after that is a hex |
| 342 | // digit then that digit must be escaped too to prevent it being |
| 343 | // interpreted as part of the character code by C. |
| 344 | const unsigned char uc = static_cast<unsigned char>(c); |
| 345 | if ((!utf8_safe || uc < 0x80) && |
| 346 | (!absl::ascii_isprint(uc) || |
| 347 | (last_hex_escape && absl::ascii_isxdigit(uc)))) { |
| 348 | if (use_hex) { |
| 349 | dest.append("\\" "x"); |
| 350 | dest.push_back(numbers_internal::kHexChar[uc / 16]); |
| 351 | dest.push_back(numbers_internal::kHexChar[uc % 16]); |
| 352 | is_hex_escape = true; |
| 353 | } else { |
| 354 | dest.append("\\"); |
| 355 | dest.push_back(numbers_internal::kHexChar[uc / 64]); |
| 356 | dest.push_back(numbers_internal::kHexChar[(uc % 64) / 8]); |
| 357 | dest.push_back(numbers_internal::kHexChar[uc % 8]); |
| 358 | } |
| 359 | } else { |
| 360 | dest.push_back(c); |
| 361 | break; |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | last_hex_escape = is_hex_escape; |
| 366 | } |
| 367 | |
| 368 | return dest; |
| 369 | } |
| 370 | |
| 371 | /* clang-format off */ |
| 372 | constexpr std::array<unsigned char, 256> kCEscapedLen = { |
| 373 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 4, 4, 2, 4, 4, // \t, \n, \r |
| 374 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 375 | 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // ", ' |
| 376 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // '0'..'9' |
| 377 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 'A'..'O' |
| 378 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, // 'P'..'Z', '\' |
| 379 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 'a'..'o' |
| 380 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, // 'p'..'z', DEL |
| 381 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 382 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 383 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 384 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 385 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 386 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 387 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 388 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
| 389 | }; |
| 390 | /* clang-format on */ |
| 391 | |
| 392 | constexpr std::array<std::array<char, 4>, 256> kCEscapedSequence = []() { |
| 393 | std::array<std::array<char, 4>, 256> a{}; |
| 394 | for (size_t c = 0; c < 256; ++c) { |
| 395 | size_t char_len = kCEscapedLen[c]; |
| 396 | if (char_len == 1) { |
| 397 | a[c][0] = static_cast<char>(c); |
| 398 | } else if (char_len == 2) { |
| 399 | a[c][0] = '\\'; |
| 400 | // clang-format off |
| 401 | switch (c) { |
| 402 | case '\n': a[c][1] = 'n'; break; |
| 403 | case '\r': a[c][1] = 'r'; break; |
| 404 | case '\t': a[c][1] = 't'; break; |
| 405 | case '\"': a[c][1] = '\"'; break; |
| 406 | case '\'': a[c][1] = '\''; break; |
| 407 | case '\\': a[c][1] = '\\'; break; |
| 408 | } |
| 409 | // clang-format on |
| 410 | } else { |
| 411 | assert(char_len == 4)(static_cast <bool> (char_len == 4) ? void (0) : __assert_fail ("char_len == 4", __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__)); |
| 412 | // A backslash followed by the octal value of the byte. |
| 413 | a[c][0] = '\\'; |
| 414 | a[c][1] = static_cast<char>('0' + (c / 64)); |
| 415 | a[c][2] = static_cast<char>('0' + ((c % 64) / 8)); |
| 416 | a[c][3] = static_cast<char>('0' + (c % 8)); |
| 417 | } |
| 418 | } |
| 419 | return a; |
| 420 | }(); |
| 421 | |
| 422 | // Calculates the length of the C-style escaped version of 'src'. |
| 423 | // Assumes that non-printable characters are escaped using octal sequences, and |
| 424 | // that UTF-8 bytes are not handled specially. |
| 425 | inline size_t CEscapedLength(absl::string_view src) { |
| 426 | size_t escaped_len = 0; |
| 427 | // The maximum value of kCEscapedLen[x] is 4, so we can escape any string of |
| 428 | // length size_t_max/4 without checking for overflow. |
| 429 | size_t unchecked_limit = |
| 430 | std::min<size_t>(src.size(), std::numeric_limits<size_t>::max() / 4); |
| 431 | size_t i = 0; |
| 432 | while (i < unchecked_limit) { |
| 433 | // Common case: No need to check for overflow. |
| 434 | escaped_len += kCEscapedLen[static_cast<unsigned char>(src[i++])]; |
| 435 | } |
| 436 | while (i < src.size()) { |
| 437 | // Beyond unchecked_limit we need to check for overflow before adding. |
| 438 | size_t char_len = kCEscapedLen[static_cast<unsigned char>(src[i++])]; |
| 439 | ABSL_INTERNAL_CHECK(do { if ((__builtin_expect(false || (!(escaped_len <= std:: numeric_limits<size_t>::max() - char_len)), false))) { std ::string death_message = "Check " "escaped_len <= std::numeric_limits<size_t>::max() - char_len" " failed: "; death_message += std::string("escaped_len overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 441, death_message) ; do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 440 | escaped_len <= std::numeric_limits<size_t>::max() - char_len,do { if ((__builtin_expect(false || (!(escaped_len <= std:: numeric_limits<size_t>::max() - char_len)), false))) { std ::string death_message = "Check " "escaped_len <= std::numeric_limits<size_t>::max() - char_len" " failed: "; death_message += std::string("escaped_len overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 441, death_message) ; do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 441 | "escaped_len overflow")do { if ((__builtin_expect(false || (!(escaped_len <= std:: numeric_limits<size_t>::max() - char_len)), false))) { std ::string death_message = "Check " "escaped_len <= std::numeric_limits<size_t>::max() - char_len" " failed: "; death_message += std::string("escaped_len overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 441, death_message) ; do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0); |
| 442 | escaped_len += char_len; |
| 443 | } |
| 444 | return escaped_len; |
| 445 | } |
| 446 | |
| 447 | void CEscapeAndAppendInternal(absl::string_view src, |
| 448 | std::string* absl_nonnull dest) { |
| 449 | size_t escaped_len = CEscapedLength(src); |
| 450 | if (escaped_len == src.size()) { |
| 451 | dest->append(src.data(), src.size()); |
| 452 | return; |
| 453 | } |
| 454 | |
| 455 | // The small `memcpy` is faster when the size is a compile-time constant, so |
| 456 | // keep 3 slop bytes so that we can call memcpy with size=4. |
| 457 | constexpr size_t kSlopBytes = 3; |
| 458 | ABSL_INTERNAL_CHECK(do { if ((__builtin_expect(false || (!(escaped_len <= std:: numeric_limits<size_t>::max() - kSlopBytes)), false))) { std::string death_message = "Check " "escaped_len <= std::numeric_limits<size_t>::max() - kSlopBytes" " failed: "; death_message += std::string("CEscape length overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 460, death_message) ; do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 459 | escaped_len <= std::numeric_limits<size_t>::max() - kSlopBytes,do { if ((__builtin_expect(false || (!(escaped_len <= std:: numeric_limits<size_t>::max() - kSlopBytes)), false))) { std::string death_message = "Check " "escaped_len <= std::numeric_limits<size_t>::max() - kSlopBytes" " failed: "; death_message += std::string("CEscape length overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 460, death_message) ; do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 460 | "CEscape length overflow")do { if ((__builtin_expect(false || (!(escaped_len <= std:: numeric_limits<size_t>::max() - kSlopBytes)), false))) { std::string death_message = "Check " "escaped_len <= std::numeric_limits<size_t>::max() - kSlopBytes" " failed: "; death_message += std::string("CEscape length overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 460, death_message) ; do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0); |
| 461 | size_t append_buf_len = escaped_len + kSlopBytes; |
| 462 | strings_internal::StringAppendAndOverwrite( |
| 463 | *dest, append_buf_len, [src, escaped_len](char* append_ptr, size_t) { |
| 464 | for (char c : src) { |
| 465 | unsigned char uc = static_cast<unsigned char>(c); |
| 466 | memcpy(append_ptr, kCEscapedSequence[uc].data(), 4); |
| 467 | append_ptr += kCEscapedLen[uc]; |
| 468 | } |
| 469 | return escaped_len; |
| 470 | }); |
| 471 | } |
| 472 | |
| 473 | // The two strings below provide maps from normal 6-bit characters to their |
| 474 | // base64-escaped equivalent. |
| 475 | // For the inverse case, see kUn(WebSafe)Base64 in the external |
| 476 | // escaping.cc. |
| 477 | constexpr char kBase64Chars[] = |
| 478 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 479 | |
| 480 | constexpr char kWebSafeBase64Chars[] = |
| 481 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; |
| 482 | |
| 483 | // ---------------------------------------------------------------------- |
| 484 | // Take the input in groups of 4 characters and turn each |
| 485 | // character into a code 0 to 63 thus: |
| 486 | // A-Z map to 0 to 25 |
| 487 | // a-z map to 26 to 51 |
| 488 | // 0-9 map to 52 to 61 |
| 489 | // +(- for WebSafe) maps to 62 |
| 490 | // /(_ for WebSafe) maps to 63 |
| 491 | // There will be four numbers, all less than 64 which can be represented |
| 492 | // by a 6 digit binary number (aaaaaa, bbbbbb, cccccc, dddddd respectively). |
| 493 | // Arrange the 6 digit binary numbers into three bytes as such: |
| 494 | // aaaaaabb bbbbcccc ccdddddd |
| 495 | // Equals signs (one or two) are used at the end of the encoded block to |
| 496 | // indicate that the text was not an integer multiple of three bytes long. |
| 497 | // ---------------------------------------------------------------------- |
| 498 | size_t Base64EscapeInternal(const unsigned char* src, size_t szsrc, char* dest, |
| 499 | size_t szdest, const char* base64, |
| 500 | bool do_padding) { |
| 501 | constexpr char kPad64 = '='; |
| 502 | |
| 503 | constexpr size_t kMaxSize = (std::numeric_limits<size_t>::max() - 1) / 4 * 3; |
| 504 | if (ABSL_PREDICT_FALSE(szsrc > kMaxSize || szsrc * 4 > szdest * 3)(__builtin_expect(false || (szsrc > kMaxSize || szsrc * 4 > szdest * 3), false))) return 0; |
| 505 | |
| 506 | char* cur_dest = dest; |
| 507 | const unsigned char* cur_src = src; |
| 508 | |
| 509 | char* const limit_dest = dest + szdest; |
| 510 | const unsigned char* const limit_src = src + szsrc; |
| 511 | |
| 512 | // (from https://tools.ietf.org/html/rfc3548) |
| 513 | // Special processing is performed if fewer than 24 bits are available |
| 514 | // at the end of the data being encoded. A full encoding quantum is |
| 515 | // always completed at the end of a quantity. When fewer than 24 input |
| 516 | // bits are available in an input group, zero bits are added (on the |
| 517 | // right) to form an integral number of 6-bit groups. |
| 518 | // |
| 519 | // If do_padding is true, padding at the end of the data is performed. This |
| 520 | // output padding uses the '=' character. |
| 521 | |
| 522 | // Three bytes of data encodes to four characters of cyphertext. |
| 523 | // So we can pump through three-byte chunks atomically. |
| 524 | if (szsrc >= 3) { // "limit_src - 3" is UB if szsrc < 3. |
| 525 | while (cur_src < limit_src - 3) { // While we have >= 32 bits. |
| 526 | uint32_t in = absl::big_endian::Load32(cur_src) >> 8; |
| 527 | |
| 528 | cur_dest[0] = base64[in >> 18]; |
| 529 | in &= 0x3FFFF; |
| 530 | cur_dest[1] = base64[in >> 12]; |
| 531 | in &= 0xFFF; |
| 532 | cur_dest[2] = base64[in >> 6]; |
| 533 | in &= 0x3F; |
| 534 | cur_dest[3] = base64[in]; |
| 535 | |
| 536 | cur_dest += 4; |
| 537 | cur_src += 3; |
| 538 | } |
| 539 | } |
| 540 | // To save time, we didn't update szdest or szsrc in the loop. So do it now. |
| 541 | szdest = static_cast<size_t>(limit_dest - cur_dest); |
| 542 | szsrc = static_cast<size_t>(limit_src - cur_src); |
| 543 | |
| 544 | /* now deal with the tail (<=3 bytes) */ |
| 545 | switch (szsrc) { |
| 546 | case 0: |
| 547 | // Nothing left; nothing more to do. |
| 548 | break; |
| 549 | case 1: { |
| 550 | // One byte left: this encodes to two characters, and (optionally) |
| 551 | // two pad characters to round out the four-character cypherblock. |
| 552 | if (szdest < 2) return 0; |
| 553 | uint32_t in = cur_src[0]; |
| 554 | cur_dest[0] = base64[in >> 2]; |
| 555 | in &= 0x3; |
| 556 | cur_dest[1] = base64[in << 4]; |
| 557 | cur_dest += 2; |
| 558 | szdest -= 2; |
| 559 | if (do_padding) { |
| 560 | if (szdest < 2) return 0; |
| 561 | cur_dest[0] = kPad64; |
| 562 | cur_dest[1] = kPad64; |
| 563 | cur_dest += 2; |
| 564 | szdest -= 2; |
| 565 | } |
| 566 | break; |
| 567 | } |
| 568 | case 2: { |
| 569 | // Two bytes left: this encodes to three characters, and (optionally) |
| 570 | // one pad character to round out the four-character cypherblock. |
| 571 | if (szdest < 3) return 0; |
| 572 | uint32_t in = absl::big_endian::Load16(cur_src); |
| 573 | cur_dest[0] = base64[in >> 10]; |
| 574 | in &= 0x3FF; |
| 575 | cur_dest[1] = base64[in >> 4]; |
| 576 | in &= 0x00F; |
| 577 | cur_dest[2] = base64[in << 2]; |
| 578 | cur_dest += 3; |
| 579 | szdest -= 3; |
| 580 | if (do_padding) { |
| 581 | if (szdest < 1) return 0; |
| 582 | cur_dest[0] = kPad64; |
| 583 | cur_dest += 1; |
| 584 | szdest -= 1; |
| 585 | } |
| 586 | break; |
| 587 | } |
| 588 | case 3: { |
| 589 | // Three bytes left: same as in the big loop above. We can't do this in |
| 590 | // the loop because the loop above always reads 4 bytes, and the fourth |
| 591 | // byte is past the end of the input. |
| 592 | if (szdest < 4) return 0; |
| 593 | uint32_t in = |
| 594 | (uint32_t{cur_src[0]} << 16) + absl::big_endian::Load16(cur_src + 1); |
| 595 | cur_dest[0] = base64[in >> 18]; |
| 596 | in &= 0x3FFFF; |
| 597 | cur_dest[1] = base64[in >> 12]; |
| 598 | in &= 0xFFF; |
| 599 | cur_dest[2] = base64[in >> 6]; |
| 600 | in &= 0x3F; |
| 601 | cur_dest[3] = base64[in]; |
| 602 | cur_dest += 4; |
| 603 | szdest -= 4; |
Value stored to 'szdest' is never read | |
| 604 | break; |
| 605 | } |
| 606 | default: |
| 607 | // Should not be reached: blocks of 4 bytes are handled |
| 608 | // in the while loop before this switch statement. |
| 609 | ABSL_RAW_LOG(FATAL, "Logic problem? szsrc = %zu", szsrc)do { constexpr const char* absl_raw_log_internal_basename = :: absl::raw_log_internal::Basename("./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" , sizeof("./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ) - 1); ::absl::raw_log_internal::RawLog(::absl::LogSeverity:: kFatal, absl_raw_log_internal_basename, 609, "Logic problem? szsrc = %zu" , szsrc); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); |
| 610 | break; |
| 611 | } |
| 612 | return static_cast<size_t>(cur_dest - dest); |
| 613 | } |
| 614 | |
| 615 | std::string Base64EscapeToStringInternal(const unsigned char* src, size_t szsrc, |
| 616 | bool do_padding, |
| 617 | const char* base64_chars) { |
| 618 | std::string escaped; |
| 619 | const size_t calc_escaped_size = |
| 620 | strings_internal::CalculateBase64EscapedLenInternal(szsrc, do_padding); |
| 621 | StringResizeAndOverwrite( |
| 622 | escaped, calc_escaped_size, |
| 623 | [src, szsrc, base64_chars, do_padding](char* buf, size_t buf_size) { |
| 624 | const size_t escaped_len = Base64EscapeInternal( |
| 625 | src, szsrc, buf, buf_size, base64_chars, do_padding); |
| 626 | assert(escaped_len == buf_size)(static_cast <bool> (escaped_len == buf_size) ? void (0 ) : __assert_fail ("escaped_len == buf_size", __builtin_FILE ( ), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__)); |
| 627 | return escaped_len; |
| 628 | }); |
| 629 | return escaped; |
| 630 | } |
| 631 | |
| 632 | // Reverses the mapping in Base64EscapeInternal; see that method's |
| 633 | // documentation for details of the mapping. |
| 634 | bool Base64UnescapeInternal(const char* absl_nullable src_param, size_t szsrc, |
| 635 | char* absl_nullable dest, size_t szdest, |
| 636 | const std::array<signed char, 256>& unbase64, |
| 637 | size_t* absl_nonnull len) { |
| 638 | static const char kPad64Equals = '='; |
| 639 | static const char kPad64Dot = '.'; |
| 640 | |
| 641 | size_t destidx = 0; |
| 642 | int decode = 0; |
| 643 | int state = 0; |
| 644 | unsigned char ch = 0; |
| 645 | unsigned int temp = 0; |
| 646 | |
| 647 | // If "char" is signed by default, using *src as an array index results in |
| 648 | // accessing negative array elements. Treat the input as a pointer to |
| 649 | // unsigned char to avoid this. |
| 650 | const unsigned char* src = reinterpret_cast<const unsigned char*>(src_param); |
| 651 | |
| 652 | // The GET_INPUT macro gets the next input character, skipping |
| 653 | // over any whitespace, and stopping when we reach the end of the |
| 654 | // string or when we read any non-data character. The arguments are |
| 655 | // an arbitrary identifier (used as a label for goto) and the number |
| 656 | // of data bytes that must remain in the input to avoid aborting the |
| 657 | // loop. |
| 658 | #define GET_INPUT(label, remain) \ |
| 659 | label: \ |
| 660 | --szsrc; \ |
| 661 | ch = *src++; \ |
| 662 | decode = unbase64[ch]; \ |
| 663 | if (decode < 0) { \ |
| 664 | if (absl::ascii_isspace(ch) && szsrc >= remain) goto label; \ |
| 665 | state = 4 - remain; \ |
| 666 | break; \ |
| 667 | } |
| 668 | |
| 669 | // if dest is null, we're just checking to see if it's legal input |
| 670 | // rather than producing output. (I suspect this could just be done |
| 671 | // with a regexp...). We duplicate the loop so this test can be |
| 672 | // outside it instead of in every iteration. |
| 673 | |
| 674 | if (dest) { |
| 675 | // This loop consumes 4 input bytes and produces 3 output bytes |
| 676 | // per iteration. We can't know at the start that there is enough |
| 677 | // data left in the string for a full iteration, so the loop may |
| 678 | // break out in the middle; if so 'state' will be set to the |
| 679 | // number of input bytes read. |
| 680 | |
| 681 | while (szsrc >= 4) { |
| 682 | // We'll start by optimistically assuming that the next four |
| 683 | // bytes of the string (src[0..3]) are four good data bytes |
| 684 | // (that is, no nulls, whitespace, padding chars, or illegal |
| 685 | // chars). We need to test src[0..2] for nulls individually |
| 686 | // before constructing temp to preserve the property that we |
| 687 | // never read past a null in the string (no matter how long |
| 688 | // szsrc claims the string is). |
| 689 | |
| 690 | if (!src[0] || !src[1] || !src[2] || |
| 691 | ((temp = ((unsigned(unbase64[src[0]]) << 18) | |
| 692 | (unsigned(unbase64[src[1]]) << 12) | |
| 693 | (unsigned(unbase64[src[2]]) << 6) | |
| 694 | (unsigned(unbase64[src[3]])))) & |
| 695 | 0x80000000)) { |
| 696 | // Iff any of those four characters was bad (null, illegal, |
| 697 | // whitespace, padding), then temp's high bit will be set |
| 698 | // (because unbase64[] is -1 for all bad characters). |
| 699 | // |
| 700 | // We'll back up and resort to the slower decoder, which knows |
| 701 | // how to handle those cases. |
| 702 | |
| 703 | GET_INPUT(first, 4); |
| 704 | temp = static_cast<unsigned char>(decode); |
| 705 | GET_INPUT(second, 3); |
| 706 | temp = (temp << 6) | static_cast<unsigned char>(decode); |
| 707 | GET_INPUT(third, 2); |
| 708 | temp = (temp << 6) | static_cast<unsigned char>(decode); |
| 709 | GET_INPUT(fourth, 1); |
| 710 | temp = (temp << 6) | static_cast<unsigned char>(decode); |
| 711 | } else { |
| 712 | // We really did have four good data bytes, so advance four |
| 713 | // characters in the string. |
| 714 | |
| 715 | szsrc -= 4; |
| 716 | src += 4; |
| 717 | } |
| 718 | |
| 719 | // temp has 24 bits of input, so write that out as three bytes. |
| 720 | |
| 721 | if (destidx + 3 > szdest) return false; |
| 722 | dest[destidx + 2] = static_cast<char>(temp); |
| 723 | temp >>= 8; |
| 724 | dest[destidx + 1] = static_cast<char>(temp); |
| 725 | temp >>= 8; |
| 726 | dest[destidx] = static_cast<char>(temp); |
| 727 | destidx += 3; |
| 728 | } |
| 729 | } else { |
| 730 | while (szsrc >= 4) { |
| 731 | if (!src[0] || !src[1] || !src[2] || |
| 732 | ((temp = ((unsigned(unbase64[src[0]]) << 18) | |
| 733 | (unsigned(unbase64[src[1]]) << 12) | |
| 734 | (unsigned(unbase64[src[2]]) << 6) | |
| 735 | (unsigned(unbase64[src[3]])))) & |
| 736 | 0x80000000)) { |
| 737 | GET_INPUT(first_no_dest, 4); |
| 738 | GET_INPUT(second_no_dest, 3); |
| 739 | GET_INPUT(third_no_dest, 2); |
| 740 | GET_INPUT(fourth_no_dest, 1); |
| 741 | } else { |
| 742 | szsrc -= 4; |
| 743 | src += 4; |
| 744 | } |
| 745 | destidx += 3; |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | #undef GET_INPUT |
| 750 | |
| 751 | // if the loop terminated because we read a bad character, return |
| 752 | // now. |
| 753 | if (decode < 0 && ch != kPad64Equals && ch != kPad64Dot && |
| 754 | !absl::ascii_isspace(ch)) |
| 755 | return false; |
| 756 | |
| 757 | if (ch == kPad64Equals || ch == kPad64Dot) { |
| 758 | // if we stopped by hitting an '=' or '.', un-read that character -- we'll |
| 759 | // look at it again when we count to check for the proper number of |
| 760 | // equals signs at the end. |
| 761 | ++szsrc; |
| 762 | --src; |
| 763 | } else { |
| 764 | // This loop consumes 1 input byte per iteration. It's used to |
| 765 | // clean up the 0-3 input bytes remaining when the first, faster |
| 766 | // loop finishes. 'temp' contains the data from 'state' input |
| 767 | // characters read by the first loop. |
| 768 | while (szsrc > 0) { |
| 769 | --szsrc; |
| 770 | ch = *src++; |
| 771 | decode = unbase64[ch]; |
| 772 | if (decode < 0) { |
| 773 | if (absl::ascii_isspace(ch)) { |
| 774 | continue; |
| 775 | } else if (ch == kPad64Equals || ch == kPad64Dot) { |
| 776 | // back up one character; we'll read it again when we check |
| 777 | // for the correct number of pad characters at the end. |
| 778 | ++szsrc; |
| 779 | --src; |
| 780 | break; |
| 781 | } else { |
| 782 | return false; |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | // Each input character gives us six bits of output. |
| 787 | temp = (temp << 6) | static_cast<unsigned char>(decode); |
| 788 | ++state; |
| 789 | if (state == 4) { |
| 790 | // If we've accumulated 24 bits of output, write that out as |
| 791 | // three bytes. |
| 792 | if (dest) { |
| 793 | if (destidx + 3 > szdest) return false; |
| 794 | dest[destidx + 2] = static_cast<char>(temp); |
| 795 | temp >>= 8; |
| 796 | dest[destidx + 1] = static_cast<char>(temp); |
| 797 | temp >>= 8; |
| 798 | dest[destidx] = static_cast<char>(temp); |
| 799 | } |
| 800 | destidx += 3; |
| 801 | state = 0; |
| 802 | temp = 0; |
| 803 | } |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | // Process the leftover data contained in 'temp' at the end of the input. |
| 808 | int expected_equals = 0; |
| 809 | switch (state) { |
| 810 | case 0: |
| 811 | // Nothing left over; output is a multiple of 3 bytes. |
| 812 | break; |
| 813 | |
| 814 | case 1: |
| 815 | // Bad input; we have 6 bits left over. |
| 816 | return false; |
| 817 | |
| 818 | case 2: |
| 819 | // Produce one more output byte from the 12 input bits we have left. |
| 820 | if (dest) { |
| 821 | if (destidx + 1 > szdest) return false; |
| 822 | temp >>= 4; |
| 823 | dest[destidx] = static_cast<char>(temp); |
| 824 | } |
| 825 | ++destidx; |
| 826 | expected_equals = 2; |
| 827 | break; |
| 828 | |
| 829 | case 3: |
| 830 | // Produce two more output bytes from the 18 input bits we have left. |
| 831 | if (dest) { |
| 832 | if (destidx + 2 > szdest) return false; |
| 833 | temp >>= 2; |
| 834 | dest[destidx + 1] = static_cast<char>(temp); |
| 835 | temp >>= 8; |
| 836 | dest[destidx] = static_cast<char>(temp); |
| 837 | } |
| 838 | destidx += 2; |
| 839 | expected_equals = 1; |
| 840 | break; |
| 841 | |
| 842 | default: |
| 843 | // state should have no other values at this point. |
| 844 | ABSL_RAW_LOG(FATAL, "This can't happen; base64 decoder state = %d",do { constexpr const char* absl_raw_log_internal_basename = :: absl::raw_log_internal::Basename("./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" , sizeof("./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ) - 1); ::absl::raw_log_internal::RawLog(::absl::LogSeverity:: kFatal, absl_raw_log_internal_basename, 845, "This can't happen; base64 decoder state = %d" , state); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0) |
| 845 | state)do { constexpr const char* absl_raw_log_internal_basename = :: absl::raw_log_internal::Basename("./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" , sizeof("./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ) - 1); ::absl::raw_log_internal::RawLog(::absl::LogSeverity:: kFatal, absl_raw_log_internal_basename, 845, "This can't happen; base64 decoder state = %d" , state); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); |
| 846 | } |
| 847 | |
| 848 | // The remainder of the string should be all whitespace, mixed with |
| 849 | // exactly 0 equals signs, or exactly 'expected_equals' equals |
| 850 | // signs. (Always accepting 0 equals signs is an Abseil extension |
| 851 | // not covered in the RFC, as is accepting dot as the pad character.) |
| 852 | |
| 853 | int equals = 0; |
| 854 | while (szsrc > 0) { |
| 855 | if (*src == kPad64Equals || *src == kPad64Dot) |
| 856 | ++equals; |
| 857 | else if (!absl::ascii_isspace(*src)) |
| 858 | return false; |
| 859 | --szsrc; |
| 860 | ++src; |
| 861 | } |
| 862 | |
| 863 | const bool ok = (equals == 0 || equals == expected_equals); |
| 864 | if (ok) *len = destidx; |
| 865 | return ok; |
| 866 | } |
| 867 | |
| 868 | // The arrays below map base64-escaped characters back to their original values. |
| 869 | // For the inverse case, see k(WebSafe)Base64Chars in the internal |
| 870 | // escaping.cc. |
| 871 | // These arrays were generated by the following inversion code: |
| 872 | // #include <sys/time.h> |
| 873 | // #include <stdlib.h> |
| 874 | // #include <string.h> |
| 875 | // main() |
| 876 | // { |
| 877 | // static const char Base64[] = |
| 878 | // "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| 879 | // char* pos; |
| 880 | // int idx, i, j; |
| 881 | // printf(" "); |
| 882 | // for (i = 0; i < 255; i += 8) { |
| 883 | // for (j = i; j < i + 8; j++) { |
| 884 | // pos = strchr(Base64, j); |
| 885 | // if ((pos == nullptr) || (j == 0)) |
| 886 | // idx = -1; |
| 887 | // else |
| 888 | // idx = pos - Base64; |
| 889 | // if (idx == -1) |
| 890 | // printf(" %2d, ", idx); |
| 891 | // else |
| 892 | // printf(" %2d/*%c*/,", idx, j); |
| 893 | // } |
| 894 | // printf("\n "); |
| 895 | // } |
| 896 | // } |
| 897 | // |
| 898 | // where the value of "Base64[]" was replaced by one of k(WebSafe)Base64Chars |
| 899 | // in the internal escaping.cc. |
| 900 | /* clang-format off */ |
| 901 | constexpr std::array<signed char, 256> kUnBase64 = { |
| 902 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 903 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 904 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 905 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 906 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 907 | -1, -1, -1, 62/*+*/, -1, -1, -1, 63/*/ */, |
| 908 | 52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/, |
| 909 | 60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1, |
| 910 | -1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/, |
| 911 | 07/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/, |
| 912 | 15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/, |
| 913 | 23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, -1, |
| 914 | -1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/, |
| 915 | 33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/, |
| 916 | 41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/, |
| 917 | 49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1, |
| 918 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 919 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 920 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 921 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 922 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 923 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 924 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 925 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 926 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 927 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 928 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 929 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 930 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 931 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 932 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 933 | -1, -1, -1, -1, -1, -1, -1, -1 |
| 934 | }; |
| 935 | |
| 936 | constexpr std::array<signed char, 256> kUnWebSafeBase64 = { |
| 937 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 938 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 939 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 940 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 941 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 942 | -1, -1, -1, -1, -1, 62/*-*/, -1, -1, |
| 943 | 52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/, |
| 944 | 60/*8*/, 61/*9*/, -1, -1, -1, -1, -1, -1, |
| 945 | -1, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/, |
| 946 | 07/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/, |
| 947 | 15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/, |
| 948 | 23/*X*/, 24/*Y*/, 25/*Z*/, -1, -1, -1, -1, 63/*_*/, |
| 949 | -1, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/, |
| 950 | 33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/, |
| 951 | 41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/, |
| 952 | 49/*x*/, 50/*y*/, 51/*z*/, -1, -1, -1, -1, -1, |
| 953 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 954 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 955 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 956 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 957 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 958 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 959 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 960 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 961 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 962 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 963 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 964 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 965 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 966 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 967 | -1, -1, -1, -1, -1, -1, -1, -1, |
| 968 | -1, -1, -1, -1, -1, -1, -1, -1 |
| 969 | }; |
| 970 | /* clang-format on */ |
| 971 | |
| 972 | template <typename String> |
| 973 | bool Base64UnescapeInternal(const char* absl_nullable src, size_t slen, |
| 974 | String* absl_nonnull dest, |
| 975 | const std::array<signed char, 256>& unbase64) { |
| 976 | // Determine the size of the output string. Base64 encodes every 3 bytes into |
| 977 | // 4 characters. Any leftover chars are added directly for good measure. |
| 978 | const size_t dest_len = 3 * (slen / 4) + (slen % 4); |
| 979 | |
| 980 | bool ok; |
| 981 | StringResizeAndOverwrite( |
| 982 | *dest, dest_len, [src, slen, unbase64, &ok](char* buf, size_t buf_size) { |
| 983 | size_t len; |
| 984 | ok = Base64UnescapeInternal(src, slen, buf, buf_size, unbase64, &len); |
| 985 | if (!ok) { |
| 986 | len = 0; |
| 987 | } |
| 988 | assert(len <= buf_size)(static_cast <bool> (len <= buf_size) ? void (0) : __assert_fail ("len <= buf_size", __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__)); // Could be shorter if there was padding. |
| 989 | return len; |
| 990 | }); |
| 991 | return ok; |
| 992 | } |
| 993 | |
| 994 | /* clang-format off */ |
| 995 | constexpr std::array<uint8_t, 256> kHexValueLenient = { |
| 996 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 997 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 998 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 999 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, // '0'..'9' |
| 1000 | 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 'A'..'F' |
| 1001 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1002 | 0, 10, 11, 12, 13, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 'a'..'f' |
| 1003 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1004 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1005 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1006 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1007 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1008 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1009 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1010 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1011 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 1012 | }; |
| 1013 | |
| 1014 | constexpr std::array<int8_t, 256> kHexValueStrict = { |
| 1015 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1016 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1017 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1018 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, // '0'..'9' |
| 1019 | -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 'A'..'F' |
| 1020 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1021 | -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 'a'..'f' |
| 1022 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1023 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1024 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1025 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1026 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1027 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1028 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1029 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1030 | -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| 1031 | }; |
| 1032 | /* clang-format on */ |
| 1033 | |
| 1034 | // This is a templated function so that T can be either a char* |
| 1035 | // or a string. This works because we use the [] operator to access |
| 1036 | // individual characters at a time. |
| 1037 | template <typename T> |
| 1038 | void HexStringToBytesInternal(const char* absl_nullable from, T to, |
| 1039 | size_t num) { |
| 1040 | for (size_t i = 0; i < num; i++) { |
| 1041 | to[i] = static_cast<char>(kHexValueLenient[from[i * 2] & 0xFF] << 4) + |
| 1042 | static_cast<char>(kHexValueLenient[from[i * 2 + 1] & 0xFF]); |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | void BytesToHexStringInternal(const unsigned char* absl_nullable src, |
| 1047 | char* dest, size_t num) { |
| 1048 | for (auto src_ptr = src; src_ptr != (src + num); ++src_ptr, dest += 2) { |
| 1049 | const char* hex_p = &numbers_internal::kHexTable[*src_ptr * 2]; |
| 1050 | std::copy(hex_p, hex_p + 2, dest); |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | } // namespace |
| 1055 | |
| 1056 | // ---------------------------------------------------------------------- |
| 1057 | // CUnescape() |
| 1058 | // |
| 1059 | // See CUnescapeInternal() for implementation details. |
| 1060 | // ---------------------------------------------------------------------- |
| 1061 | |
| 1062 | bool CUnescape(absl::string_view source, std::string* absl_nonnull dest, |
| 1063 | std::string* absl_nullable error) { |
| 1064 | bool success; |
| 1065 | |
| 1066 | // `CUnescape()` allows for in-place unescaping, which means `source` may |
| 1067 | // alias `*dest`. However, absl::StringResizeAndOverwrite() invalidates all |
| 1068 | // iterators, pointers, and references into the string, regardless whether |
| 1069 | // reallocation occurs. Therefore we need to avoid calling |
| 1070 | // absl::StringResizeAndOverwrite() when `source.data() == |
| 1071 | // dest->data()`. Comparing the sizes is sufficient to cover this case. |
| 1072 | if (dest->size() >= source.size()) { |
| 1073 | size_t dest_size = 0; |
| 1074 | success = CUnescapeInternal(source, kUnescapeNulls, dest->data(), |
| 1075 | &dest_size, error); |
| 1076 | ABSL_ASSERT(dest_size <= dest->size())((__builtin_expect(false || ((dest_size <= dest->size() )), true)) ? static_cast<void>(0) : (static_cast <bool > (false && "dest_size <= dest->size()") ? void (0) : __assert_fail ("false && \"dest_size <= dest->size()\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ ))); |
| 1077 | dest->erase(dest_size); |
| 1078 | } else { |
| 1079 | StringResizeAndOverwrite( |
| 1080 | *dest, source.size(), |
| 1081 | [source, error, &success](char* buf, size_t buf_size) { |
| 1082 | size_t dest_size = 0; |
| 1083 | success = |
| 1084 | CUnescapeInternal(source, kUnescapeNulls, buf, &dest_size, error); |
| 1085 | ABSL_ASSERT(dest_size <= buf_size)((__builtin_expect(false || ((dest_size <= buf_size)), true )) ? static_cast<void>(0) : (static_cast <bool> ( false && "dest_size <= buf_size") ? void (0) : __assert_fail ("false && \"dest_size <= buf_size\"", __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__))); |
| 1086 | return dest_size; |
| 1087 | }); |
| 1088 | } |
| 1089 | return success; |
| 1090 | } |
| 1091 | |
| 1092 | std::string CEscape(absl::string_view src) { |
| 1093 | std::string dest; |
| 1094 | CEscapeAndAppendInternal(src, &dest); |
| 1095 | return dest; |
| 1096 | } |
| 1097 | |
| 1098 | std::string CHexEscape(absl::string_view src) { |
| 1099 | return CEscapeInternal(src, true, false); |
| 1100 | } |
| 1101 | |
| 1102 | std::string Utf8SafeCEscape(absl::string_view src) { |
| 1103 | return CEscapeInternal(src, false, true); |
| 1104 | } |
| 1105 | |
| 1106 | std::string Utf8SafeCHexEscape(absl::string_view src) { |
| 1107 | return CEscapeInternal(src, true, true); |
| 1108 | } |
| 1109 | |
| 1110 | bool Base64Unescape(absl::string_view src, std::string* absl_nonnull dest) { |
| 1111 | return Base64UnescapeInternal(src.data(), src.size(), dest, kUnBase64); |
| 1112 | } |
| 1113 | |
| 1114 | bool WebSafeBase64Unescape(absl::string_view src, |
| 1115 | std::string* absl_nonnull dest) { |
| 1116 | return Base64UnescapeInternal(src.data(), src.size(), dest, kUnWebSafeBase64); |
| 1117 | } |
| 1118 | |
| 1119 | std::string Base64Escape(absl::string_view src) { |
| 1120 | return Base64EscapeToStringInternal( |
| 1121 | reinterpret_cast<const unsigned char*>(src.data()), src.size(), true, |
| 1122 | kBase64Chars); |
| 1123 | } |
| 1124 | |
| 1125 | std::string WebSafeBase64Escape(absl::string_view src) { |
| 1126 | return Base64EscapeToStringInternal( |
| 1127 | reinterpret_cast<const unsigned char*>(src.data()), src.size(), false, |
| 1128 | kWebSafeBase64Chars); |
| 1129 | } |
| 1130 | |
| 1131 | bool HexStringToBytes(absl::string_view hex, std::string* absl_nonnull bytes) { |
| 1132 | std::string output; |
| 1133 | |
| 1134 | size_t num_bytes = hex.size() / 2; |
| 1135 | if (hex.size() != num_bytes * 2) { |
| 1136 | return false; |
| 1137 | } |
| 1138 | |
| 1139 | StringResizeAndOverwrite( |
| 1140 | output, num_bytes, [hex](char* buf, size_t buf_size) { |
| 1141 | auto hex_p = hex.cbegin(); |
| 1142 | for (size_t i = 0; i < buf_size; ++i) { |
| 1143 | int h1 = absl::kHexValueStrict[static_cast<size_t>( |
| 1144 | static_cast<uint8_t>(*hex_p++))]; |
| 1145 | int h2 = absl::kHexValueStrict[static_cast<size_t>( |
| 1146 | static_cast<uint8_t>(*hex_p++))]; |
| 1147 | if (h1 == -1 || h2 == -1) { |
| 1148 | return size_t{0}; |
| 1149 | } |
| 1150 | buf[i] = static_cast<char>((h1 << 4) + h2); |
| 1151 | } |
| 1152 | return buf_size; |
| 1153 | }); |
| 1154 | |
| 1155 | if (output.size() != num_bytes) { |
| 1156 | return false; |
| 1157 | } |
| 1158 | *bytes = std::move(output); |
| 1159 | return true; |
| 1160 | } |
| 1161 | |
| 1162 | std::string HexStringToBytes(absl::string_view from) { |
| 1163 | std::string result; |
| 1164 | const auto num = from.size() / 2; |
| 1165 | StringResizeAndOverwrite(result, num, [from](char* buf, size_t buf_size) { |
| 1166 | absl::HexStringToBytesInternal<char*>(from.data(), buf, buf_size); |
| 1167 | return buf_size; |
| 1168 | }); |
| 1169 | return result; |
| 1170 | } |
| 1171 | |
| 1172 | std::string BytesToHexString(absl::string_view from) { |
| 1173 | std::string result; |
| 1174 | ABSL_INTERNAL_CHECK(from.size() <= std::numeric_limits<size_t>::max() / 2,do { if ((__builtin_expect(false || (!(from.size() <= std:: numeric_limits<size_t>::max() / 2)), false))) { std::string death_message = "Check " "from.size() <= std::numeric_limits<size_t>::max() / 2" " failed: "; death_message += std::string("BytesToHexString() overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 1175, death_message ); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 1175 | "BytesToHexString() overflow")do { if ((__builtin_expect(false || (!(from.size() <= std:: numeric_limits<size_t>::max() / 2)), false))) { std::string death_message = "Check " "from.size() <= std::numeric_limits<size_t>::max() / 2" " failed: "; death_message += std::string("BytesToHexString() overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 1175, death_message ); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0); |
| 1176 | StringResizeAndOverwrite( |
| 1177 | result, 2 * from.size(), [from](char* buf, size_t buf_size) { |
| 1178 | absl::BytesToHexStringInternal( |
| 1179 | reinterpret_cast<const unsigned char*>(from.data()), buf, |
| 1180 | from.size()); |
| 1181 | return buf_size; |
| 1182 | }); |
| 1183 | return result; |
| 1184 | } |
| 1185 | |
| 1186 | static std::string UrlEscapeInternal(absl::string_view input, |
| 1187 | const bool escape_space_to_plus) { |
| 1188 | // Unreserved characters from RFC 3986. |
| 1189 | // See https://www.rfc-editor.org/info/rfc3986/#section-2.3. |
| 1190 | static constexpr absl::CharSet kRfc3986Unreserved = |
| 1191 | absl::CharSet::AsciiAlphanumerics() | absl::CharSet("-._~"); |
| 1192 | |
| 1193 | std::string output; |
| 1194 | absl::string_view::iterator in = input.begin(); |
| 1195 | |
| 1196 | // Fast path for when we don't need to do any escaping. |
| 1197 | while (in < input.end() && kRfc3986Unreserved.contains(*in)) { |
| 1198 | ++in; |
| 1199 | } |
| 1200 | |
| 1201 | std::size_t initial_portion = |
| 1202 | static_cast<std::size_t>(std::distance(input.begin(), in)); |
| 1203 | |
| 1204 | if (initial_portion == input.size()) { |
| 1205 | return std::string(input); |
| 1206 | } |
| 1207 | |
| 1208 | // We need a buffer with enough space to store at most the initial portion |
| 1209 | // plus 3 bytes for each remaining character since escapes use 3 characters. |
| 1210 | ABSL_INTERNAL_CHECK(do { if ((__builtin_expect(false || (!((input.size() - initial_portion ) <= (std::numeric_limits<size_t>::max() - initial_portion ) / 3)), false))) { std::string death_message = "Check " "(input.size() - initial_portion) <= (std::numeric_limits<size_t>::max() - initial_portion) / 3" " failed: "; death_message += std::string("UrlEscape() overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 1213, death_message ); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 1211 | (input.size() - initial_portion) <=do { if ((__builtin_expect(false || (!((input.size() - initial_portion ) <= (std::numeric_limits<size_t>::max() - initial_portion ) / 3)), false))) { std::string death_message = "Check " "(input.size() - initial_portion) <= (std::numeric_limits<size_t>::max() - initial_portion) / 3" " failed: "; death_message += std::string("UrlEscape() overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 1213, death_message ); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 1212 | (std::numeric_limits<size_t>::max() - initial_portion) / 3,do { if ((__builtin_expect(false || (!((input.size() - initial_portion ) <= (std::numeric_limits<size_t>::max() - initial_portion ) / 3)), false))) { std::string death_message = "Check " "(input.size() - initial_portion) <= (std::numeric_limits<size_t>::max() - initial_portion) / 3" " failed: "; death_message += std::string("UrlEscape() overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 1213, death_message ); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0) |
| 1213 | "UrlEscape() overflow")do { if ((__builtin_expect(false || (!((input.size() - initial_portion ) <= (std::numeric_limits<size_t>::max() - initial_portion ) / 3)), false))) { std::string death_message = "Check " "(input.size() - initial_portion) <= (std::numeric_limits<size_t>::max() - initial_portion) / 3" " failed: "; death_message += std::string("UrlEscape() overflow" ); do { constexpr const char* absl_raw_log_internal_filename = "./../../../../../../third_party/abseil-cpp/absl/strings/escaping.cc" ; ::absl::raw_log_internal::internal_log_function( ::absl::LogSeverity ::kFatal, absl_raw_log_internal_filename, 1213, death_message ); do { (static_cast <bool> (false && "ABSL_UNREACHABLE reached" ) ? void (0) : __assert_fail ("false && \"ABSL_UNREACHABLE reached\"" , __builtin_FILE (), __builtin_LINE (), __extension__ __PRETTY_FUNCTION__ )); __builtin_unreachable(); } while (false); } while (0); } } while (0); |
| 1214 | StringResizeAndOverwrite( |
| 1215 | output, initial_portion + 3 * (input.size() - initial_portion), |
| 1216 | [&](char* buf, size_t) { |
| 1217 | char* out = buf; |
| 1218 | |
| 1219 | // Copy the initial portion that did not need escaping. |
| 1220 | out = std::copy(input.begin(), in, out); |
| 1221 | |
| 1222 | // Handle the rest of the string. |
| 1223 | while (in < input.end()) { |
| 1224 | char c = *in++; |
| 1225 | if (kRfc3986Unreserved.contains(c)) { |
| 1226 | *out++ = c; |
| 1227 | } else if (escape_space_to_plus && c == ' ') { |
| 1228 | *out++ = '+'; |
| 1229 | } else { |
| 1230 | *out++ = '%'; |
| 1231 | *out++ = static_cast<char>( |
| 1232 | int_to_hex_digit((static_cast<unsigned char>(c) >> 4) & 0xf)); |
| 1233 | *out++ = static_cast<char>( |
| 1234 | int_to_hex_digit(static_cast<unsigned char>(c) & 0xf)); |
| 1235 | } |
| 1236 | } |
| 1237 | return static_cast<size_t>(std::distance(buf, out)); |
| 1238 | }); |
| 1239 | |
| 1240 | return output; |
| 1241 | } |
| 1242 | |
| 1243 | static std::optional<std::string> UrlUnescapeInternal( |
| 1244 | absl::string_view input, const bool unescape_plus_to_space) { |
| 1245 | std::string output; |
| 1246 | |
| 1247 | // Fast path for when we don't need to do any unescaping. |
| 1248 | // This case includes empty input, which allows us to return 0 from the |
| 1249 | // lambda below to signal the error case. |
| 1250 | size_t in = |
| 1251 | unescape_plus_to_space ? input.find_first_of("%+") : input.find('%'); |
| 1252 | if (in == input.npos) { |
| 1253 | return std::string(input); |
| 1254 | } |
| 1255 | |
| 1256 | StringResizeAndOverwrite(output, input.size(), [&](char* buf, size_t) { |
| 1257 | char* out = buf; |
| 1258 | |
| 1259 | // Copy the initial portion that did not need unescaping. |
| 1260 | out = std::copy_n(input.data(), in, out); |
| 1261 | |
| 1262 | // Handle the rest of the string. |
| 1263 | while (in < input.size()) { |
| 1264 | char c = input[in++]; |
| 1265 | if (unescape_plus_to_space && c == '+') { |
| 1266 | *out++ = ' '; |
| 1267 | } else if (c == '%') { |
| 1268 | if (in + 1 >= input.size() || |
| 1269 | !absl::ascii_isxdigit(static_cast<unsigned char>(input[in])) || |
| 1270 | !absl::ascii_isxdigit(static_cast<unsigned char>(input[in + 1]))) { |
| 1271 | return size_t{0}; // Error. |
| 1272 | } |
| 1273 | int x = static_cast<int>(hex_digit_to_int(input[in++])) << 4; |
| 1274 | x += static_cast<int>(hex_digit_to_int(input[in++])); |
| 1275 | *out++ = static_cast<char>(x); |
| 1276 | } else { |
| 1277 | *out++ = c; |
| 1278 | } |
| 1279 | } |
| 1280 | return static_cast<size_t>(std::distance(buf, out)); |
| 1281 | }); |
| 1282 | |
| 1283 | if (output.empty()) { |
| 1284 | // Empty output is only valid if the input was empty, and that case is |
| 1285 | // handled above. |
| 1286 | return std::nullopt; |
| 1287 | } |
| 1288 | |
| 1289 | return output; |
| 1290 | } |
| 1291 | |
| 1292 | std::string UrlEscape(absl::string_view input) { |
| 1293 | constexpr bool kEscapeSpaceToPlus = false; |
| 1294 | return UrlEscapeInternal(input, kEscapeSpaceToPlus); |
| 1295 | } |
| 1296 | |
| 1297 | std::optional<std::string> UrlUnescape(absl::string_view input) { |
| 1298 | constexpr bool kUnescapePlusToSpace = false; |
| 1299 | return UrlUnescapeInternal(input, kUnescapePlusToSpace); |
| 1300 | } |
| 1301 | |
| 1302 | std::string UrlEscapePlus(absl::string_view input) { |
| 1303 | constexpr bool kEscapeSpaceToPlus = true; |
| 1304 | return UrlEscapeInternal(input, kEscapeSpaceToPlus); |
| 1305 | } |
| 1306 | |
| 1307 | std::optional<std::string> UrlUnescapePlus(absl::string_view input) { |
| 1308 | constexpr bool kUnescapePlusToSpace = true; |
| 1309 | return UrlUnescapeInternal(input, kUnescapePlusToSpace); |
| 1310 | } |
| 1311 | |
| 1312 | ABSL_NAMESPACE_END |
| 1313 | } // namespace absl |