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Merge "Add fbounds-safety annotations for VP8BitReader." into main

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This commit is contained in:
James Zern
2025-08-15 19:40:01 -07:00
committed by Gerrit Code Review
parent fb656b44f3 59dae3a508
commit 8a2b400352
3 changed files with 15 additions and 8 deletions
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1
src/utils/bit_reader_inl_utils.h
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@@ -85,6 +85,7 @@ static WEBP_UBSAN_IGNORE_UNDEF WEBP_INLINE void VP8LoadNewBytes(
WEBP_UNSAFE_MEMCPY(&in_bits, br->buf, sizeof(in_bits));
#endif
br->buf += BITS >> 3;
WEBP_SELF_ASSIGN(br->buf_end);
#if !defined(WORDS_BIGENDIAN)
#if (BITS > 32)
bits = BSwap64(in_bits);

7
src/utils/bit_reader_utils.c
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@@ -31,7 +31,8 @@ WEBP_ASSUME_UNSAFE_INDEXABLE_ABI
//------------------------------------------------------------------------------
// VP8BitReader
void VP8BitReaderSetBuffer(VP8BitReader* const br, const uint8_t* const start,
void VP8BitReaderSetBuffer(VP8BitReader* const br,
const uint8_t* const WEBP_COUNTED_BY(size) start,
size_t size) {
assert(start != NULL);
br->buf = start;
@@ -40,7 +41,8 @@ void VP8BitReaderSetBuffer(VP8BitReader* const br, const uint8_t* const start,
(size >= sizeof(lbit_t)) ? start + size - sizeof(lbit_t) + 1 : start;
}
void VP8InitBitReader(VP8BitReader* const br, const uint8_t* const start,
void VP8InitBitReader(VP8BitReader* const br,
const uint8_t* const WEBP_COUNTED_BY(size) start,
size_t size) {
assert(br != NULL);
assert(start != NULL);
@@ -87,6 +89,7 @@ void VP8LoadFinalBytes(VP8BitReader* const br) {
if (br->buf < br->buf_end) {
br->bits += 8;
br->value = (bit_t)(*br->buf++) | (br->value << 8);
WEBP_SELF_ASSIGN(br->buf_end);
} else if (!br->eof) {
br->value <<= 8;
br->bits += 8;

15
src/utils/bit_reader_utils.h
View File

@@ -103,17 +103,20 @@ struct VP8BitReader {
range_t range; // current range minus 1. In [127, 254] interval.
int bits; // number of valid bits left
// read buffer
const uint8_t* buf; // next byte to be read
const uint8_t* buf_end; // end of read buffer
const uint8_t* buf_max; // max packed-read position on buffer
int eof; // true if input is exhausted
const uint8_t* WEBP_ENDED_BY(buf_end) buf; // next byte to be read
const uint8_t* buf_end; // end of read buffer
// max packed-read position on buffer
const uint8_t* WEBP_UNSAFE_INDEXABLE buf_max;
int eof; // true if input is exhausted
};
// Initialize the bit reader and the boolean decoder.
void VP8InitBitReader(VP8BitReader* const br, const uint8_t* const start,
void VP8InitBitReader(VP8BitReader* const br,
const uint8_t* const WEBP_COUNTED_BY(size) start,
size_t size);
// Sets the working read buffer.
void VP8BitReaderSetBuffer(VP8BitReader* const br, const uint8_t* const start,
void VP8BitReaderSetBuffer(VP8BitReader* const br,
const uint8_t* const WEBP_COUNTED_BY(size) start,
size_t size);
// Update internal pointers to displace the byte buffer by the