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demux: add a tail pointer for chunks

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a large number of non-frame chunks could slow the parse

Change-Id: I181bc73626e92263c3c5b2a6dc2bf6e6a0481d52
This commit is contained in:
James Zern 2013-11-16 10:57:09 -08:00
parent 87cffcc3c9
commit d2e3f4e6b5
1 changed files with 4 additions and 3 deletions
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7
src/demux/demux.c
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@ -75,6 +75,7 @@ struct WebPDemuxer {
Frame* frames_;
Frame** frames_tail_;
Chunk* chunks_; // non-image chunks
Chunk** chunks_tail_;
};
typedef enum {
@ -179,10 +180,9 @@ static WEBP_INLINE uint32_t ReadLE32(MemBuffer* const mem) {
// Secondary chunk parsing
static void AddChunk(WebPDemuxer* const dmux, Chunk* const chunk) {
Chunk** c = &dmux->chunks_;
while (*c != NULL) c = &(*c)->next_;
*c = chunk;
*dmux->chunks_tail_ = chunk;
chunk->next_ = NULL;
dmux->chunks_tail_ = &chunk->next_;
}
// Add a frame to the end of the list, ensuring the last frame is complete.
@ -697,6 +697,7 @@ static void InitDemux(WebPDemuxer* const dmux, const MemBuffer* const mem) {
dmux->canvas_width_ = -1;
dmux->canvas_height_ = -1;
dmux->frames_tail_ = &dmux->frames_;
dmux->chunks_tail_ = &dmux->chunks_;
dmux->mem_ = *mem;
}