1 files changed, 6 insertions, 12 deletions

diff --git a/lz4.c b/lz4.c
index 2660f5d..2fac1a6 100644
--- a/lz4.c
+++ b/lz4.c
@@ -181,16 +181,10 @@ typedef struct _U64_S { U64 v; } U64_S;
 #define HASHTABLESIZE (1 << HASH_LOG)

 #define HASH_MASK (HASHTABLESIZE - 1)

 

-// NOTCOMPRESSIBLE_DETECTIONLEVEL :

-// Decreasing this value will make the algorithm skip faster data segments considered "incompressible"

-// This may decrease compression ratio dramatically, but will be faster on incompressible data

-// Increasing this value will make the algorithm search more before declaring a segment "incompressible"

-// This could improve compression a bit, but will be slower on incompressible data

-// The default value (6) is recommended

-#define NOTCOMPRESSIBLE_DETECTIONLEVEL 6

+#define NOTCOMPRESSIBLE_DETECTIONLEVEL 6 // Increasing this value will make the algorithm slower on incompressible data

 #define SKIPSTRENGTH (NOTCOMPRESSIBLE_DETECTIONLEVEL>2?NOTCOMPRESSIBLE_DETECTIONLEVEL:2)

 #define STACKLIMIT 13

-#define HEAPMODE (HASH_LOG>STACKLIMIT)  // Defines if memory is allocated into the stack (local variable), or into the heap (malloc()).

+#define HEAPMODE (HASH_LOG>STACKLIMIT)   // Defines if memory is allocated into the stack (local variable), or into the heap (malloc()).

 #define COPYLENGTH 8

 #define LASTLITERALS 5

 #define MFLIMIT (COPYLENGTH+MINMATCH)

@@ -338,7 +332,7 @@ static inline int LZ4_NbCommonBytes (register U32 val)
 static inline int LZ4_compressCtx(void** ctx,

                  const char* source,

                  char* dest,

-                 int isize,

+                 int inputSize,

                  int maxOutputSize)

 {

 #if HEAPMODE

@@ -351,7 +345,7 @@ static inline int LZ4_compressCtx(void** ctx,
     const BYTE* ip = (BYTE*) source;

     INITBASE(base);

     const BYTE* anchor = ip;

-    const BYTE* const iend = ip + isize;

+    const BYTE* const iend = ip + inputSize;

     const BYTE* const mflimit = iend - MFLIMIT;

 #define matchlimit (iend - LASTLITERALS)

 

@@ -364,7 +358,7 @@ static inline int LZ4_compressCtx(void** ctx,
 

 

     // Init

-    if (isize<MINLENGTH) goto _last_literals;

+    if (inputSize<MINLENGTH) goto _last_literals;

 #if HEAPMODE

     if (*ctx == NULL)

     {

@@ -496,7 +490,7 @@ _last_literals:
     // Encode Last Literals

     {

         int lastRun = (int)(iend - anchor);

-        if (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize) return 0;

+        if (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize) return 0;  // Check output limit

         if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }

         else *op++ = (BYTE)(lastRun<<ML_BITS);

         memcpy(op, anchor, iend - anchor);