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[lib] Add ZSTD_c_deterministicRefPrefix

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This flag forces zstd to always load the prefix in ext-dict mode, even
if it happens to be contiguous, to force determinism. It also applies to
dictionaries that are re-processed.

A determinism test case is also added, which fails without
`ZSTD_c_deterministicRefPrefix` and passes with it set.

Question: Should this be the default behavior? It isn't in this PR.
This commit is contained in:
Nick Terrell
2021-05-05 12:18:47 -07:00
parent 2d10544b84
commit 172b4b6ac4
7 changed files with 109 additions and 9 deletions
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1
tests/fuzz/zstd_helpers.c
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@ -97,6 +97,7 @@ void FUZZ_setRandomParameters(ZSTD_CCtx *cctx, size_t srcSize, FUZZ_dataProducer
setRand(cctx, ZSTD_c_literalCompressionMode, 0, 2, producer);
setRand(cctx, ZSTD_c_forceAttachDict, 0, 2, producer);
setRand(cctx, ZSTD_c_splitBlocks, 0, 1, producer);
setRand(cctx, ZSTD_c_deterministicRefPrefix, 0, 1, producer);
if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
setRand(cctx, ZSTD_c_srcSizeHint, ZSTD_SRCSIZEHINT_MIN, 2 * srcSize, producer);
}