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Cap hashLog & chainLog to ensure that we only use 32 bits of hash

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* Cap shortCache chainLog to 24
* Cap row match finder hashLog so that rowLog <= 24
* Add unit tests to expose all cases. The row match finder unit tests
  are only run in 64-bit mode, because they allocate ~1GB.

Fixes #3336
This commit is contained in:
Nick Terrell
2023-01-20 14:05:26 -08:00
committed by Nick Terrell
parent abf965c64a
commit 666944fbe6
5 changed files with 144 additions and 7 deletions
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lib/compress/zstd_lazy.c
-1
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@@ -759,7 +759,6 @@ size_t ZSTD_HcFindBestMatch(
***********************************/
/* Constants for row-based hash */
#define ZSTD_ROW_HASH_TAG_OFFSET 16 /* byte offset of hashes in the match state's tagTable from the beginning of a row */
#define ZSTD_ROW_HASH_TAG_BITS 8 /* nb bits to use for the tag */
#define ZSTD_ROW_HASH_TAG_MASK ((1u << ZSTD_ROW_HASH_TAG_BITS) - 1)
#define ZSTD_ROW_HASH_MAX_ENTRIES 64 /* absolute maximum number of entries per row, for all configurations */