MdeModulePkg BrotliLib: Fix the regression logic issue in loop

[mirror_edk2.git] / MdeModulePkg / Library / BrotliCustomDecompressLib / dec / bit_reader.c

/* Copyright 2013 Google Inc. All Rights Reserved.\r
\r
   Distributed under MIT license.\r
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT\r
*/\r
\r
/* Bit reading helpers */\r
\r
#include "./bit_reader.h"\r
\r
#include "../common/types.h"\r
#include "./port.h"\r
\r
#if defined(__cplusplus) || defined(c_plusplus)\r
extern "C" {\r
#endif\r
\r
void BrotliInitBitReader(BrotliBitReader* const br) {\r
  br->val_ = 0;\r
  br->bit_pos_ = sizeof(br->val_) << 3;\r
}\r
\r
BROTLI_BOOL BrotliWarmupBitReader(BrotliBitReader* const br) {\r
  size_t aligned_read_mask = (sizeof(br->val_) >> 1) - 1;\r
  /* Fixing alignment after unaligned BrotliFillWindow would result accumulator\r
     overflow. If unalignment is caused by BrotliSafeReadBits, then there is\r
     enough space in accumulator to fix aligment. */\r
  if (!BROTLI_ALIGNED_READ) {\r
    aligned_read_mask = 0;\r
  }\r
  if (BrotliGetAvailableBits(br) == 0) {\r
    if (!BrotliPullByte(br)) {\r
      return BROTLI_FALSE;\r
    }\r
  }\r
\r
  while ((((size_t)(*br->next_in)) & aligned_read_mask) != 0) {\r
    if (!BrotliPullByte(br)) {\r
      /* If we consumed all the input, we don't care about the alignment. */\r
      return BROTLI_TRUE;\r
    }\r
  }\r
  return BROTLI_TRUE;\r
}\r
\r
#if defined(__cplusplus) || defined(c_plusplus)\r
}  /* extern "C" */\r
#endif\r