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Don't Clear the Dictionary Context Until No Longer Useful

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This commit is contained in:
W. Felix Handte 2018-04-19 17:51:10 -04:00
parent 0abc23f72e
commit f4b13e17ea
1 changed files with 5 additions and 2 deletions
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7
lib/lz4hc.c
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@ -746,15 +746,18 @@ static int LZ4HC_compress_generic_dictCtx (
limitedOutput_directive limit
)
{
size_t position = ctx->end - ctx->base - ctx->lowLimit;
assert(ctx->dictCtx != NULL);
if (*srcSizePtr > 4 KB) {
if (position >= 64 KB) {
ctx->dictCtx = NULL;
return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
} else if (position == 0 && *srcSizePtr > 4 KB) {
memcpy(ctx, ctx->dictCtx, sizeof(LZ4HC_CCtx_internal));
LZ4HC_setExternalDict(ctx, (const BYTE *)src);
ctx->compressionLevel = cLevel;
return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
} else {
int result = LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, usingDictCtx);
ctx->dictCtx = NULL;
return result;
}
}