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Code Issues Releases 1 Activity

Adjust Strategy in CParams to Avoid Using Excluded Block Compressors

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This commit is contained in:
W. Felix Handte 2023-04-19 17:53:40 -04:00
parent 50cdf84f58
commit 5a75956001
1 changed files with 44 additions and 0 deletions
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44
lib/compress/zstd_compress.c
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@ -1467,6 +1467,50 @@ ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
assert(ZSTD_checkCParams(cPar)==0);
/* Cascade the selected strategy down to the next-highest one built into
* this binary. */
#ifdef ZSTD_EXCLUDE_BTULTRA2_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btultra2) {
cPar.strategy = ZSTD_btultra;
}
#endif
#ifdef ZSTD_EXCLUDE_BTULTRA_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btultra) {
cPar.strategy = ZSTD_btopt;
}
#endif
#ifdef ZSTD_EXCLUDE_BTOPT_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btopt) {
cPar.strategy = ZSTD_btlazy2;
}
#endif
#ifdef ZSTD_EXCLUDE_BTLAZY2_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_btlazy2) {
cPar.strategy = ZSTD_lazy2;
}
#endif
#ifdef ZSTD_EXCLUDE_LAZY2_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_lazy2) {
cPar.strategy = ZSTD_lazy;
}
#endif
#ifdef ZSTD_EXCLUDE_LAZY_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_lazy) {
cPar.strategy = ZSTD_greedy;
}
#endif
#ifdef ZSTD_EXCLUDE_GREEDY_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_greedy) {
cPar.strategy = ZSTD_dfast;
}
#endif
#ifdef ZSTD_EXCLUDE_DFAST_BLOCK_COMPRESSOR
if (cPar.strategy == ZSTD_dfast) {
cPar.strategy = ZSTD_fast;
cPar.targetLength = 0;
}
#endif
switch (mode) {
case ZSTD_cpm_unknown:
case ZSTD_cpm_noAttachDict: