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authorW. Felix Handte <w@felixhandte.com>2018-04-19 21:51:10 (GMT)
committerW. Felix Handte <w@felixhandte.com>2018-04-20 00:54:35 (GMT)
commitf4b13e17ea110498c41ba3ac8dc6df0438c37d29 (patch)
treefcd69335ca09a69502b9f73a9920a33c08647b09 /lib
parent0abc23f72e44dd9af86e7fb61a2497cee81ed320 (diff)
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Don't Clear the Dictionary Context Until No Longer Useful
Diffstat (limited to 'lib')
-rw-r--r--lib/lz4hc.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/lz4hc.c b/lib/lz4hc.c
index c201559..9a02787 100644
--- a/lib/lz4hc.c
+++ b/lib/lz4hc.c
@@ -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;
}
}