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Hoist LZ4F Dictionary Setup into Helper LZ4F_applyCDict()

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This commit is contained in:
W. Felix Handte 2018-03-12 16:11:55 -04:00
parent 3ecc1d7a5b
commit 1df5d911aa
1 changed files with 25 additions and 47 deletions
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72
lib/lz4frame.c
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@ -531,6 +531,28 @@ LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t LZ4F_comp
}
static void LZ4F_applyCDict(void* ctx,
const LZ4F_CDict* cdict,
int level) {
if (level < LZ4HC_CLEVEL_MIN) {
LZ4_stream_t_internal* internal_ctx = &((LZ4_stream_t *)ctx)->internal_donotuse;
assert(!internal_ctx->initCheck);
/* Clear any local dictionary */
internal_ctx->dictionary = NULL;
internal_ctx->dictSize = 0;
/* Point to the dictionary context */
internal_ctx->dictCtx = cdict ? &(cdict->fastCtx->internal_donotuse) : NULL;
} else {
if (cdict) {
memcpy(ctx, cdict->HCCtx, sizeof(*cdict->HCCtx));
LZ4_setCompressionLevel((LZ4_streamHC_t*)ctx, level);
} else {
LZ4_resetStreamHC((LZ4_streamHC_t*)(ctx), level);
}
}
}
/*! LZ4F_compressBegin_usingCDict() :
* init streaming compression and writes frame header into dstBuffer.
* dstBuffer must be >= LZ4F_HEADER_SIZE_MAX bytes.
@ -601,39 +623,7 @@ size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctxPtr,
cctxPtr->cdict = cdict;
if (cctxPtr->prefs.frameInfo.blockMode == LZ4F_blockLinked) {
/* frame init only for blockLinked : blockIndependent will be init at each block */
if (cdict) {
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) {
LZ4_stream_t_internal* internal_ctx = &((LZ4_stream_t*)cctxPtr->lz4CtxPtr)->internal_donotuse;
assert(!internal_ctx->initCheck);
if (internal_ctx->currentOffset > 1 GB) {
/* Init the context */
LZ4_resetStream((LZ4_stream_t*)cctxPtr->lz4CtxPtr);
}
/* Clear any local dictionary */
internal_ctx->dictionary = NULL;
internal_ctx->dictSize = 0;
/* Point to the dictionary context */
internal_ctx->dictCtx = &(cdict->fastCtx->internal_donotuse);
} else {
memcpy(cctxPtr->lz4CtxPtr, cdict->HCCtx, sizeof(*cdict->HCCtx));
LZ4_setCompressionLevel((LZ4_streamHC_t*)cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel);
}
} else {
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) {
LZ4_stream_t_internal* internal_ctx = &((LZ4_stream_t*)cctxPtr->lz4CtxPtr)->internal_donotuse;
assert(!internal_ctx->initCheck);
if (internal_ctx->currentOffset > 1 GB) {
/* Init the context */
LZ4_resetStream((LZ4_stream_t*)cctxPtr->lz4CtxPtr);
}
/* Clear any local dictionary */
internal_ctx->dictionary = NULL;
internal_ctx->dictSize = 0;
internal_ctx->dictCtx = NULL;
} else {
LZ4_resetStreamHC((LZ4_streamHC_t*)(cctxPtr->lz4CtxPtr), cctxPtr->prefs.compressionLevel);
}
}
LZ4F_applyCDict(cctxPtr->lz4CtxPtr, cdict, cctxPtr->prefs.compressionLevel);
}
/* Magic Number */
@ -728,21 +718,10 @@ static size_t LZ4F_makeBlock(void* dst, const void* src, size_t srcSize,
static int LZ4F_compressBlock(void* ctx, const char* src, char* dst, int srcSize, int dstCapacity, int level, const LZ4F_CDict* cdict)
{
int const acceleration = (level < -1) ? -level : 1;
LZ4_stream_t_internal* internal_ctx = &((LZ4_stream_t*)ctx)->internal_donotuse;
assert(!internal_ctx->initCheck);
if (internal_ctx->currentOffset > 1 GB) {
/* Init the context */
LZ4_resetStream((LZ4_stream_t*)ctx);
}
/* Clear any local dictionary */
internal_ctx->dictionary = NULL;
internal_ctx->dictSize = 0;
LZ4F_applyCDict(ctx, cdict, level);
if (cdict) {
/* Point to the dictionary context */
internal_ctx->dictCtx = &(cdict->fastCtx->internal_donotuse);
return LZ4_compress_fast_continue((LZ4_stream_t*)ctx, src, dst, srcSize, dstCapacity, acceleration);
} else {
internal_ctx->dictCtx = NULL;
return LZ4_compress_fast_safeExtState(ctx, src, dst, srcSize, dstCapacity, acceleration);
}
}
@ -757,8 +736,7 @@ static int LZ4F_compressBlock_continue(void* ctx, const char* src, char* dst, in
static int LZ4F_compressBlockHC(void* ctx, const char* src, char* dst, int srcSize, int dstCapacity, int level, const LZ4F_CDict* cdict)
{
if (cdict) {
memcpy(ctx, cdict->HCCtx, sizeof(*cdict->HCCtx));
LZ4_setCompressionLevel((LZ4_streamHC_t*)ctx, level);
LZ4F_applyCDict(ctx, cdict, level);
return LZ4_compress_HC_continue((LZ4_streamHC_t*)ctx, src, dst, srcSize, dstCapacity);
}
return LZ4_compress_HC_extStateHC(ctx, src, dst, srcSize, dstCapacity, level);