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bytestream: add bytestream2_copy_buffer() functions

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This is basically an overread/overwrite-safe memcpy between a
GetByteContext and a PutByteContext.

CC:libav-stable@libav.org
This commit is contained in:
Justin Ruggles 2013-09-29 19:45:57 -04:00
parent de9d2705f6
commit 5748faf291
1 changed files with 26 additions and 0 deletions
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26
libavcodec/bytestream.h
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@ -325,6 +325,32 @@ static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
return p->eof;
}
static av_always_inline unsigned int bytestream2_copy_bufferu(PutByteContext *p,
GetByteContext *g,
unsigned int size)
{
memcpy(p->buffer, g->buffer, size);
p->buffer += size;
g->buffer += size;
return size;
}
static av_always_inline unsigned int bytestream2_copy_buffer(PutByteContext *p,
GetByteContext *g,
unsigned int size)
{
int size2;
if (p->eof)
return 0;
size = FFMIN(g->buffer_end - g->buffer, size);
size2 = FFMIN(p->buffer_end - p->buffer, size);
if (size2 != size)
p->eof = 1;
return bytestream2_copy_bufferu(p, g, size2);
}
static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
uint8_t *dst,
unsigned int size)