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Remove Strategy-Dependency in Making Attachment Decision

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This commit is contained in:
W. Felix Handte 2018-09-12 12:04:04 -07:00
parent 00c088b32d
commit 77fd17d93f
1 changed files with 18 additions and 30 deletions
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48
lib/compress/zstd_compress.c
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@ -1320,31 +1320,25 @@ static const size_t attachDictSizeCutoffs[(unsigned)ZSTD_btultra+1] = {
8 KB /* ZSTD_btultra */
};
static const ZSTD_strategy splitLogCutoffStrategy = ZSTD_btultra;
static int ZSTD_shouldAttachDict(ZSTD_CCtx* cctx,
const ZSTD_CDict* cdict,
ZSTD_CCtx_params params,
U64 pledgedSrcSize)
static int ZSTD_shouldAttachDict(const ZSTD_CDict* cdict,
ZSTD_CCtx_params params,
U64 pledgedSrcSize)
{
size_t cutoff = attachDictSizeCutoffs[cdict->matchState.cParams.strategy];
return ( pledgedSrcSize <= cutoff
|| pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN
|| params.attachDictPref == ZSTD_dictForceAttach )
&& params.attachDictPref != ZSTD_dictForceCopy
&& !params.forceWindow /* dictMatchState isn't correctly
* handled in _enforceMaxDist */
&& ( (cdict->matchState.cParams.strategy <= splitLogCutoffStrategy)
|| (cdict->matchState.cParams.strategy > splitLogCutoffStrategy &&
ZSTD_equivalentCParams(cctx->appliedParams.cParams,
cdict->matchState.cParams)));
&& !params.forceWindow; /* dictMatchState isn't correctly
* handled in _enforceMaxDist */
}
static size_t ZSTD_resetCCtx_byAttachingCDict(ZSTD_CCtx* cctx,
const ZSTD_CDict* cdict,
ZSTD_CCtx_params params,
U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
static size_t ZSTD_resetCCtx_byAttachingCDict(
ZSTD_CCtx* cctx,
const ZSTD_CDict* cdict,
ZSTD_CCtx_params params,
U64 pledgedSrcSize,
ZSTD_buffered_policy_e zbuff)
{
{
const ZSTD_compressionParameters *cdict_cParams = &cdict->matchState.cParams;
@ -1353,21 +1347,15 @@ static size_t ZSTD_resetCCtx_byAttachingCDict(ZSTD_CCtx* cctx,
/* Copy only compression parameters related to tables. */
params.cParams = *cdict_cParams;
params.cParams.windowLog = windowLog;
if (params.cParams.strategy <= splitLogCutoffStrategy) {
DEBUGLOG(4, "Overriding hashLog from %d to %d", params.cParams.hashLog, cctx->requestedParams.cParams.hashLog);
DEBUGLOG(4, "Overriding chainLog from %d to %d", params.cParams.chainLog, cctx->requestedParams.cParams.chainLog);
if (cctx->requestedParams.cParams.hashLog)
params.cParams.hashLog = cctx->requestedParams.cParams.hashLog;
if (cctx->requestedParams.cParams.chainLog)
params.cParams.chainLog = cctx->requestedParams.cParams.chainLog;
}
DEBUGLOG(4, "Overriding hashLog from %d to %d", params.cParams.hashLog, cctx->requestedParams.cParams.hashLog);
DEBUGLOG(4, "Overriding chainLog from %d to %d", params.cParams.chainLog, cctx->requestedParams.cParams.chainLog);
if (cctx->requestedParams.cParams.hashLog)
params.cParams.hashLog = cctx->requestedParams.cParams.hashLog;
if (cctx->requestedParams.cParams.chainLog)
params.cParams.chainLog = cctx->requestedParams.cParams.chainLog;
ZSTD_resetCCtx_internal(cctx, params, pledgedSrcSize,
ZSTDcrp_continue, zbuff);
assert(cctx->appliedParams.cParams.strategy == cdict_cParams->strategy);
if (params.cParams.strategy > splitLogCutoffStrategy) {
assert(cctx->appliedParams.cParams.hashLog == cdict_cParams->hashLog);
assert(cctx->appliedParams.cParams.chainLog == cdict_cParams->chainLog);
}
}
{
@ -1468,7 +1456,7 @@ static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
DEBUGLOG(4, "ZSTD_resetCCtx_usingCDict (pledgedSrcSize=%u)", (U32)pledgedSrcSize);
if (ZSTD_shouldAttachDict(cctx, cdict, params, pledgedSrcSize)) {
if (ZSTD_shouldAttachDict(cdict, params, pledgedSrcSize)) {
return ZSTD_resetCCtx_byAttachingCDict(
cctx, cdict, params, pledgedSrcSize, zbuff);
} else {