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Speed-up chunk list operations.

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The chunk list only has two operations: append and set
to one element. The two operations are split and the append
one is sped up by storing the last element.
Corrupted data could make a very long list to search through.

BUG=oss-fuzz:9190

Change-Id: I1aa813ca629df29efaa3b46dbd4c4c42dbeaa34c
This commit is contained in:
Vincent Rabaud
2018-07-03 16:36:34 +02:00
parent 2281bbf6f7
commit a9ceda7ff1
4 changed files with 54 additions and 46 deletions
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11
src/mux/muxi.h
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@ -127,11 +127,14 @@ WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag);
WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data,
int copy_data, uint32_t tag);
// Sets 'chunk' at nth position in the 'chunk_list'.
// nth = 0 has the special meaning "last of the list".
// Sets 'chunk' as the only element in 'chunk_list' if it is empty.
// On success ownership is transferred from 'chunk' to the 'chunk_list'.
WebPMuxError ChunkSetNth(WebPChunk* chunk, WebPChunk** chunk_list,
uint32_t nth);
WebPMuxError ChunkSetHead(WebPChunk* chunk, WebPChunk** chunk_list);
// Sets 'chunk' at last position in the 'chunk_list'.
// On success ownership is transferred from 'chunk' to the 'chunk_list'.
// *chunk_list also points towards the last valid element of the initial
// *chunk_list.
WebPMuxError ChunkAppend(WebPChunk* chunk, WebPChunk*** chunk_list);
// Releases chunk and returns chunk->next_.
WebPChunk* ChunkRelease(WebPChunk* const chunk);