ddidderr/zstd-rs
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[libzstd] Allow compression parameters to be set with a cdict

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The order you set parameters in the advanced API is not supposed to matter.
However, once you call `ZSTD_CCtx_refCDict()` the compression parameters
cannot be changed. Remove that restriction, and document what parameters
are used when using a CDict.

If the CCtx is in dictionary mode, then the CDict's parameters are used.
If the CCtx is not in dictionary mode, then its requested parameters are
used.
This commit is contained in:
Nick Terrell committed 2019-03-13 16:10:05 -07:00
1 parent ea3b81f02c
commit 787b76904a
3 files changed
+22 -18
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tests/fuzzer.c
+11
View File
@@ -1294,6 +1294,17 @@ static int basicUnitTests(U32 seed, double compressibility)
}
DISPLAYLEVEL(3, "OK \n");
DISPLAYLEVEL(3, "test%3i : ZSTD_CCtx_refCDict() then set parameters : ", testNb++);
{ ZSTD_CDict* const cdict = ZSTD_createCDict(CNBuffer, dictSize, 1);
CHECK_Z( ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, 1) );
CHECK_Z( ZSTD_CCtx_setParameter(cctx, ZSTD_c_hashLog, 12 ));
CHECK_Z( ZSTD_CCtx_refCDict(cctx, cdict) );
CHECK_Z( ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, 1) );
CHECK_Z( ZSTD_CCtx_setParameter(cctx, ZSTD_c_hashLog, 12 ));
ZSTD_freeCDict(cdict);
}
DISPLAYLEVEL(3, "OK \n");
DISPLAYLEVEL(3, "test%3i : Dictionary with non-default repcodes : ", testNb++);
{ U32 u; for (u=0; u<nbSamples; u++) samplesSizes[u] = sampleUnitSize; }
dictSize = ZDICT_trainFromBuffer(dictBuffer, dictSize,