diff options
| -rw-r--r-- | core/fxcodec/codec/fx_codec_fax.cpp | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/core/fxcodec/codec/fx_codec_fax.cpp b/core/fxcodec/codec/fx_codec_fax.cpp index 20280a3760..9739101fec 100644 --- a/core/fxcodec/codec/fx_codec_fax.cpp +++ b/core/fxcodec/codec/fx_codec_fax.cpp @@ -66,9 +66,21 @@ int FindBit(const uint8_t* data_buf, int max_pos, int start_pos, bool bit) { start_pos += 7; } - uint8_t skip = bit ? 0x00 : 0xff; + const uint8_t skip = bit ? 0x00 : 0xff; + const int max_byte = (max_pos + 7) / 8; int byte_pos = start_pos / 8; - int max_byte = (max_pos + 7) / 8; + + // Try reading in bigger chunks in case there are long runs to be skipped. + static constexpr int kBulkReadSize = 8; + if (max_byte >= kBulkReadSize && byte_pos < max_byte - kBulkReadSize) { + uint8_t skip_block[kBulkReadSize]; + memset(skip_block, skip, kBulkReadSize); + while (byte_pos < max_byte - kBulkReadSize && + memcmp(data_buf + byte_pos, skip_block, kBulkReadSize) == 0) { + byte_pos += kBulkReadSize; + } + } + while (byte_pos < max_byte) { if (data_buf[byte_pos] != skip) break; |