kc3-lang/brotli/c/common/transform.c

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• Hash : 103b25fb
  Author :
  Date : 2025-08-13T02:10:36
  

  explicitly specify model for relocatable variables
  
  PiperOrigin-RevId: 794473371
  

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• c/common/transform.c

• /* Copyright 2013 Google Inc. All Rights Reserved.
  
     Distributed under MIT license.
     See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
  */
  
  #include "platform.h"
  #include "transform.h"
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  /* RFC 7932 transforms string data */
  static const BROTLI_MODEL("small") char kPrefixSuffix[217] =
        "\1 \2, \10 of the \4 of \2s \1.\5 and \4 "
  /* 0x  _0 _2  __5        _E    _3  _6 _8     _E */
        "in \1\"\4 to \2\">\1\n\2. \1]\5 for \3 a \6 "
  /* 2x     _3_ _5    _A_  _D_ _F  _2 _4     _A   _E */
        "that \1\'\6 with \6 from \4 by \1(\6. T"
  /* 4x       _5_ _7      _E      _5    _A _C */
        "he \4 on \4 as \4 is \4ing \2\n\t\1:\3ed "
  /* 6x     _3    _8    _D    _2    _7_ _ _A _C */
        "\2=\"\4 at \3ly \1,\2=\'\5.com/\7. This \5"
  /* 8x  _0 _ _3    _8   _C _E _ _1     _7       _F */
        " not \3er \3al \4ful \4ive \5less \4es"
  /* Ax       _5   _9   _D    _2    _7     _D */
        "t \4ize \2\xc2\xa0\4ous \5 the \2e "; /* \0 - implicit trailing zero. */
  /* Cx    _2    _7___ ___ _A    _F     _5        _8 */
  
  static const BROTLI_MODEL("small") uint16_t kPrefixSuffixMap[50] = {
    0x00, 0x02, 0x05, 0x0E, 0x13, 0x16, 0x18, 0x1E, 0x23, 0x25,
    0x2A, 0x2D, 0x2F, 0x32, 0x34, 0x3A, 0x3E, 0x45, 0x47, 0x4E,
    0x55, 0x5A, 0x5C, 0x63, 0x68, 0x6D, 0x72, 0x77, 0x7A, 0x7C,
    0x80, 0x83, 0x88, 0x8C, 0x8E, 0x91, 0x97, 0x9F, 0xA5, 0xA9,
    0xAD, 0xB2, 0xB7, 0xBD, 0xC2, 0xC7, 0xCA, 0xCF, 0xD5, 0xD8
  };
  
  /* RFC 7932 transforms */
  static const BROTLI_MODEL("small") uint8_t kTransformsData[] = {
    49, BROTLI_TRANSFORM_IDENTITY, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 0,
     0, BROTLI_TRANSFORM_IDENTITY, 0,
    49, BROTLI_TRANSFORM_OMIT_FIRST_1, 49,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 0,
    49, BROTLI_TRANSFORM_IDENTITY, 47,
     0, BROTLI_TRANSFORM_IDENTITY, 49,
     4, BROTLI_TRANSFORM_IDENTITY, 0,
    49, BROTLI_TRANSFORM_IDENTITY, 3,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 6,
    49, BROTLI_TRANSFORM_OMIT_FIRST_2, 49,
    49, BROTLI_TRANSFORM_OMIT_LAST_1, 49,
     1, BROTLI_TRANSFORM_IDENTITY, 0,
    49, BROTLI_TRANSFORM_IDENTITY, 1,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 0,
    49, BROTLI_TRANSFORM_IDENTITY, 7,
    49, BROTLI_TRANSFORM_IDENTITY, 9,
    48, BROTLI_TRANSFORM_IDENTITY, 0,
    49, BROTLI_TRANSFORM_IDENTITY, 8,
    49, BROTLI_TRANSFORM_IDENTITY, 5,
    49, BROTLI_TRANSFORM_IDENTITY, 10,
    49, BROTLI_TRANSFORM_IDENTITY, 11,
    49, BROTLI_TRANSFORM_OMIT_LAST_3, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 13,
    49, BROTLI_TRANSFORM_IDENTITY, 14,
    49, BROTLI_TRANSFORM_OMIT_FIRST_3, 49,
    49, BROTLI_TRANSFORM_OMIT_LAST_2, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 15,
    49, BROTLI_TRANSFORM_IDENTITY, 16,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 12,
     5, BROTLI_TRANSFORM_IDENTITY, 49,
     0, BROTLI_TRANSFORM_IDENTITY, 1,
    49, BROTLI_TRANSFORM_OMIT_FIRST_4, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 18,
    49, BROTLI_TRANSFORM_IDENTITY, 17,
    49, BROTLI_TRANSFORM_IDENTITY, 19,
    49, BROTLI_TRANSFORM_IDENTITY, 20,
    49, BROTLI_TRANSFORM_OMIT_FIRST_5, 49,
    49, BROTLI_TRANSFORM_OMIT_FIRST_6, 49,
    47, BROTLI_TRANSFORM_IDENTITY, 49,
    49, BROTLI_TRANSFORM_OMIT_LAST_4, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 22,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 23,
    49, BROTLI_TRANSFORM_IDENTITY, 24,
    49, BROTLI_TRANSFORM_IDENTITY, 25,
    49, BROTLI_TRANSFORM_OMIT_LAST_7, 49,
    49, BROTLI_TRANSFORM_OMIT_LAST_1, 26,
    49, BROTLI_TRANSFORM_IDENTITY, 27,
    49, BROTLI_TRANSFORM_IDENTITY, 28,
     0, BROTLI_TRANSFORM_IDENTITY, 12,
    49, BROTLI_TRANSFORM_IDENTITY, 29,
    49, BROTLI_TRANSFORM_OMIT_FIRST_9, 49,
    49, BROTLI_TRANSFORM_OMIT_FIRST_7, 49,
    49, BROTLI_TRANSFORM_OMIT_LAST_6, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 21,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 1,
    49, BROTLI_TRANSFORM_OMIT_LAST_8, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 31,
    49, BROTLI_TRANSFORM_IDENTITY, 32,
    47, BROTLI_TRANSFORM_IDENTITY, 3,
    49, BROTLI_TRANSFORM_OMIT_LAST_5, 49,
    49, BROTLI_TRANSFORM_OMIT_LAST_9, 49,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 1,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 8,
     5, BROTLI_TRANSFORM_IDENTITY, 21,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 0,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 10,
    49, BROTLI_TRANSFORM_IDENTITY, 30,
     0, BROTLI_TRANSFORM_IDENTITY, 5,
    35, BROTLI_TRANSFORM_IDENTITY, 49,
    47, BROTLI_TRANSFORM_IDENTITY, 2,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 17,
    49, BROTLI_TRANSFORM_IDENTITY, 36,
    49, BROTLI_TRANSFORM_IDENTITY, 33,
     5, BROTLI_TRANSFORM_IDENTITY, 0,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 21,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 5,
    49, BROTLI_TRANSFORM_IDENTITY, 37,
     0, BROTLI_TRANSFORM_IDENTITY, 30,
    49, BROTLI_TRANSFORM_IDENTITY, 38,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 0,
    49, BROTLI_TRANSFORM_IDENTITY, 39,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 49,
    49, BROTLI_TRANSFORM_IDENTITY, 34,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 8,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 12,
     0, BROTLI_TRANSFORM_IDENTITY, 21,
    49, BROTLI_TRANSFORM_IDENTITY, 40,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 12,
    49, BROTLI_TRANSFORM_IDENTITY, 41,
    49, BROTLI_TRANSFORM_IDENTITY, 42,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 17,
    49, BROTLI_TRANSFORM_IDENTITY, 43,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 5,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 10,
     0, BROTLI_TRANSFORM_IDENTITY, 34,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 33,
    49, BROTLI_TRANSFORM_IDENTITY, 44,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 5,
    45, BROTLI_TRANSFORM_IDENTITY, 49,
     0, BROTLI_TRANSFORM_IDENTITY, 33,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 30,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 30,
    49, BROTLI_TRANSFORM_IDENTITY, 46,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 1,
    49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 34,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 33,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 30,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 1,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 33,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 21,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 12,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 5,
    49, BROTLI_TRANSFORM_UPPERCASE_ALL, 34,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 12,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 30,
     0, BROTLI_TRANSFORM_UPPERCASE_ALL, 34,
     0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 34,
  };
  
  static const BROTLI_MODEL("small")
  BrotliTransforms kBrotliTransforms = {
    sizeof(kPrefixSuffix),
    (const uint8_t*)kPrefixSuffix,
    kPrefixSuffixMap,
    sizeof(kTransformsData) / (3 * sizeof(kTransformsData[0])),
    kTransformsData,
    NULL,  /* no extra parameters */
    {0, 12, 27, 23, 42, 63, 56, 48, 59, 64}
  };
  
  const BrotliTransforms* BrotliGetTransforms(void) {
    return &kBrotliTransforms;
  }
  
  static int ToUpperCase(uint8_t* p) {
    if (p[0] < 0xC0) {
      if (p[0] >= 'a' && p[0] <= 'z') {
        p[0] ^= 32;
      }
      return 1;
    }
    /* An overly simplified uppercasing model for UTF-8. */
    if (p[0] < 0xE0) {
      p[1] ^= 32;
      return 2;
    }
    /* An arbitrary transform for three byte characters. */
    p[2] ^= 5;
    return 3;
  }
  
  static int Shift(uint8_t* word, int word_len, uint16_t parameter) {
    /* Limited sign extension: scalar < (1 << 24). */
    uint32_t scalar =
        (parameter & 0x7FFFu) + (0x1000000u - (parameter & 0x8000u));
    if (word[0] < 0x80) {
      /* 1-byte rune / 0sssssss / 7 bit scalar (ASCII). */
      scalar += (uint32_t)word[0];
      word[0] = (uint8_t)(scalar & 0x7Fu);
      return 1;
    } else if (word[0] < 0xC0) {
      /* Continuation / 10AAAAAA. */
      return 1;
    } else if (word[0] < 0xE0) {
      /* 2-byte rune / 110sssss AAssssss / 11 bit scalar. */
      if (word_len < 2) return 1;
      scalar += (uint32_t)((word[1] & 0x3Fu) | ((word[0] & 0x1Fu) << 6u));
      word[0] = (uint8_t)(0xC0 | ((scalar >> 6u) & 0x1F));
      word[1] = (uint8_t)((word[1] & 0xC0) | (scalar & 0x3F));
      return 2;
    } else if (word[0] < 0xF0) {
      /* 3-byte rune / 1110ssss AAssssss BBssssss / 16 bit scalar. */
      if (word_len < 3) return word_len;
      scalar += (uint32_t)((word[2] & 0x3Fu) | ((word[1] & 0x3Fu) << 6u) |
          ((word[0] & 0x0Fu) << 12u));
      word[0] = (uint8_t)(0xE0 | ((scalar >> 12u) & 0x0F));
      word[1] = (uint8_t)((word[1] & 0xC0) | ((scalar >> 6u) & 0x3F));
      word[2] = (uint8_t)((word[2] & 0xC0) | (scalar & 0x3F));
      return 3;
    } else if (word[0] < 0xF8) {
      /* 4-byte rune / 11110sss AAssssss BBssssss CCssssss / 21 bit scalar. */
      if (word_len < 4) return word_len;
      scalar += (uint32_t)((word[3] & 0x3Fu) | ((word[2] & 0x3Fu) << 6u) |
          ((word[1] & 0x3Fu) << 12u) | ((word[0] & 0x07u) << 18u));
      word[0] = (uint8_t)(0xF0 | ((scalar >> 18u) & 0x07));
      word[1] = (uint8_t)((word[1] & 0xC0) | ((scalar >> 12u) & 0x3F));
      word[2] = (uint8_t)((word[2] & 0xC0) | ((scalar >> 6u) & 0x3F));
      word[3] = (uint8_t)((word[3] & 0xC0) | (scalar & 0x3F));
      return 4;
    }
    return 1;
  }
  
  int BrotliTransformDictionaryWord(uint8_t* dst, const uint8_t* word, int len,
      const BrotliTransforms* transforms, int transform_idx) {
    int idx = 0;
    const uint8_t* prefix = BROTLI_TRANSFORM_PREFIX(transforms, transform_idx);
    uint8_t type = BROTLI_TRANSFORM_TYPE(transforms, transform_idx);
    const uint8_t* suffix = BROTLI_TRANSFORM_SUFFIX(transforms, transform_idx);
    {
      int prefix_len = *prefix++;
      while (prefix_len--) { dst[idx++] = *prefix++; }
    }
    {
      const int t = type;
      int i = 0;
      if (t <= BROTLI_TRANSFORM_OMIT_LAST_9) {
        len -= t;
      } else if (t >= BROTLI_TRANSFORM_OMIT_FIRST_1
          && t <= BROTLI_TRANSFORM_OMIT_FIRST_9) {
        int skip = t - (BROTLI_TRANSFORM_OMIT_FIRST_1 - 1);
        word += skip;
        len -= skip;
      }
      while (i < len) { dst[idx++] = word[i++]; }
      if (t == BROTLI_TRANSFORM_UPPERCASE_FIRST) {
        ToUpperCase(&dst[idx - len]);
      } else if (t == BROTLI_TRANSFORM_UPPERCASE_ALL) {
        uint8_t* uppercase = &dst[idx - len];
        while (len > 0) {
          int step = ToUpperCase(uppercase);
          uppercase += step;
          len -= step;
        }
      } else if (t == BROTLI_TRANSFORM_SHIFT_FIRST) {
        uint16_t param = (uint16_t)(transforms->params[transform_idx * 2]
            + (transforms->params[transform_idx * 2 + 1] << 8u));
        Shift(&dst[idx - len], len, param);
      } else if (t == BROTLI_TRANSFORM_SHIFT_ALL) {
        uint16_t param = (uint16_t)(transforms->params[transform_idx * 2]
            + (transforms->params[transform_idx * 2 + 1] << 8u));
        uint8_t* shift = &dst[idx - len];
        while (len > 0) {
          int step = Shift(shift, len, param);
          shift += step;
          len -= step;
        }
      }
    }
    {
      int suffix_len = *suffix++;
      while (suffix_len--) { dst[idx++] = *suffix++; }
      return idx;
    }
  }
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }  /* extern "C" */
  #endif
  

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