Function tinfl_decompress

SampleFramework12/v1.00/TinyEXR.cpp:2033–2468

  MZ_MACRO_END

tinfl_status tinfl_decompress(tinfl_decompressor *r,
                              const mz_uint8 *pIn_buf_next,
                              size_t *pIn_buf_size, mz_uint8 *pOut_buf_start,
                              mz_uint8 *pOut_buf_next, size_t *pOut_buf_size,
                              const mz_uint32 decomp_flags) {
  static const int s_length_base[31] = {
      3,  4,  5,  6,  7,  8,  9,  10,  11,  13,  15,  17,  19,  23, 27, 31,
      35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0,  0};
  static const int s_length_extra[31] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
                                         1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4,
                                         4, 4, 5, 5, 5, 5, 0, 0, 0};
  static const int s_dist_base[32] = {
      1,    2,    3,    4,    5,    7,     9,     13,    17,  25,   33,
      49,   65,   97,   129,  193,  257,   385,   513,   769, 1025, 1537,
      2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 0,   0};
  static const int s_dist_extra[32] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
                                       4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
                                       9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
  static const mz_uint8 s_length_dezigzag[19] = {
      16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
  static const int s_min_table_sizes[3] = {257, 1, 4};

  tinfl_status status = TINFL_STATUS_FAILED;
  mz_uint32 num_bits, dist, counter, num_extra;
  tinfl_bit_buf_t bit_buf;
  const mz_uint8 *pIn_buf_cur = pIn_buf_next,
                 *const pIn_buf_end = pIn_buf_next + *pIn_buf_size;
  mz_uint8 *pOut_buf_cur = pOut_buf_next,
           *const pOut_buf_end = pOut_buf_next + *pOut_buf_size;
  size_t out_buf_size_mask =
             (decomp_flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF)
                 ? (size_t)-1
                 : ((pOut_buf_next - pOut_buf_start) + *pOut_buf_size) - 1,
         dist_from_out_buf_start;

  // Ensure the output buffer's size is a power of 2, unless the output buffer
  // is large enough to hold the entire output file (in which case it doesn't
  // matter).
  if (((out_buf_size_mask + 1) & out_buf_size_mask) ||
      (pOut_buf_next < pOut_buf_start)) {
    *pIn_buf_size = *pOut_buf_size = 0;
    return TINFL_STATUS_BAD_PARAM;
  }

  num_bits = r->m_num_bits;
  bit_buf = r->m_bit_buf;
  dist = r->m_dist;
  counter = r->m_counter;
  num_extra = r->m_num_extra;
  dist_from_out_buf_start = r->m_dist_from_out_buf_start;
  TINFL_CR_BEGIN

  bit_buf = num_bits = dist = counter = num_extra = r->m_zhdr0 = r->m_zhdr1 = 0;
  r->m_z_adler32 = r->m_check_adler32 = 1;
  if (decomp_flags & TINFL_FLAG_PARSE_ZLIB_HEADER) {
    TINFL_GET_BYTE(1, r->m_zhdr0);
    TINFL_GET_BYTE(2, r->m_zhdr1);
    counter = (((r->m_zhdr0 * 256 + r->m_zhdr1) % 31 != 0) ||