Add Fast Reset Paths

diff --git a/lib/lz4hc.c b/lib/lz4hc.c
index fa2cbb7..9deb90d 100644 (file)
--- a/lib/lz4hc.c
+++ b/lib/lz4hc.c
@@ -716,11 +716,11 @@ static int LZ4HC_compress_generic (
 
 int LZ4_sizeofStateHC(void) { return sizeof(LZ4_streamHC_t); }
 
-int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
+int LZ4_compress_HC_extStateHC_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
 {
     LZ4HC_CCtx_internal* const ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
     if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
-    LZ4_resetStreamHC((LZ4_streamHC_t*)state, compressionLevel);
+    LZ4_resetStreamHC_fast((LZ4_streamHC_t*)state, compressionLevel);
     LZ4HC_init (ctx, (const BYTE*)src);
     if (dstCapacity < LZ4_compressBound(srcSize))
         return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, limitedOutput);
@@ -728,6 +728,13 @@ int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int src
         return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, noLimit);
 }
 
+int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
+{
+    if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
+    LZ4_resetStreamHC ((LZ4_streamHC_t*)state, compressionLevel);
+    return LZ4_compress_HC_extStateHC_fastReset(state, src, dst, srcSize, dstCapacity, compressionLevel);
+}
+
 int LZ4_compress_HC(const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
 {
 #if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
@@ -787,6 +794,16 @@ void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
     LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
 }
 
+void LZ4_resetStreamHC_fast (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
+{
+    LZ4_STATIC_ASSERT(sizeof(LZ4HC_CCtx_internal) <= sizeof(size_t) * LZ4_STREAMHCSIZE_SIZET);   /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
+    DEBUGLOG(4, "LZ4_resetStreamHC_fast(%p, %d)", LZ4_streamHCPtr, compressionLevel);
+    LZ4_streamHCPtr->internal_donotuse.end -= (uptrval)LZ4_streamHCPtr->internal_donotuse.base;
+    LZ4_streamHCPtr->internal_donotuse.base = NULL;
+    LZ4_streamHCPtr->internal_donotuse.dictCtx = NULL;
+    LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
+}
+
 void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
 {
     if (compressionLevel < 1) compressionLevel = LZ4HC_CLEVEL_DEFAULT;

diff --git a/lib/lz4hc.h b/lib/lz4hc.h
index 1b08425..3b0d0d3 100644 (file)
--- a/lib/lz4hc.h
+++ b/lib/lz4hc.h
@@ -270,7 +270,9 @@ int LZ4_compress_HC_continue_destSize(LZ4_streamHC_t* LZ4_streamHCPtr,
  */
 void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
 
+void LZ4_resetStreamHC_fast(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
 
+int LZ4_compress_HC_extStateHC_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel);
 
 #endif   /* LZ4_HC_SLO_098092834 */
 #endif   /* LZ4_HC_STATIC_LINKING_ONLY */