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lavc: introduce the convenience function init_get_bits8

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Accept the buffer size in bytes and check for overflow before passing
the value in bits to init_get_bits.
This commit is contained in:
Luca Barbato 2013-01-13 23:37:11 +01:00
parent d9cf5f5169
commit e28ac6e5e2
1 changed files with 16 additions and 0 deletions
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16
libavcodec/get_bits.h
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@ -393,6 +393,22 @@ static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
return ret; return ret;
} }
/**
* Initialize GetBitContext.
* @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes
* larger than the actual read bits because some optimized bitstream
* readers read 32 or 64 bit at once and could read over the end
* @param byte_size the size of the buffer in bytes
* @return 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow.
*/
static inline int init_get_bits8(GetBitContext *s, const uint8_t *buffer,
int byte_size)
{
if (byte_size > INT_MAX / 8)
return AVERROR_INVALIDDATA;
return init_get_bits(s, buffer, byte_size * 8);
}
static inline void align_get_bits(GetBitContext *s) static inline void align_get_bits(GetBitContext *s)
{ {
int n = -get_bits_count(s) & 7; int n = -get_bits_count(s) & 7;