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Merge pull request #494 from felixhandte/kill-goto

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Return to Allowing Early Returns in LZ4_compress_generic()
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Yann Collet 2018-04-06 17:35:45 -07:00 committed by GitHub
commit c7b17be938
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1 changed files with 17 additions and 21 deletions
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38
lib/lz4.c
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@ -626,8 +626,6 @@ LZ4_FORCE_INLINE int LZ4_compress_generic(
BYTE* op = (BYTE*) dest;
BYTE* const olimit = op + maxOutputSize;
ptrdiff_t retval = 0;
U32 forwardH;
/* Init conditions */
@ -637,6 +635,19 @@ LZ4_FORCE_INLINE int LZ4_compress_generic(
dictLowLimit = dictionary ? dictionary : lowLimit;
if ((tableType == byU16) && (inputSize>=LZ4_64Klimit)) return 0; /* Size too large (not within 64K limit) */
/* Update context state */
if (dictDirective == usingDictCtx) {
/* Subsequent linked blocks can't use the dictionary. */
/* Instead, they use the block we just compressed. */
cctx->dictCtx = NULL;
cctx->dictSize = (U32)inputSize;
} else {
cctx->dictSize += (U32)inputSize;
}
cctx->currentOffset += (U32)inputSize;
cctx->tableType = tableType;
if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
/* First Byte */
@ -697,7 +708,7 @@ LZ4_FORCE_INLINE int LZ4_compress_generic(
token = op++;
if ((outputLimited) && /* Check output buffer overflow */
(unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit)))
goto _clean_up;
return 0;
if (litLength >= RUN_MASK) {
int len = (int)litLength-RUN_MASK;
*token = (RUN_MASK<<ML_BITS);
@ -737,7 +748,7 @@ _next_match:
if ( outputLimited && /* Check output buffer overflow */
(unlikely(op + (1 + LASTLITERALS) + (matchCode>>8) > olimit)) )
goto _clean_up;
return 0;
if (matchCode >= ML_MASK) {
*token += ML_MASK;
matchCode -= ML_MASK;
@ -796,7 +807,7 @@ _last_literals:
{ size_t const lastRun = (size_t)(iend - anchor);
if ( (outputLimited) && /* Check output buffer overflow */
((op - (BYTE*)dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize) )
goto _clean_up;
return 0;
if (lastRun >= RUN_MASK) {
size_t accumulator = lastRun - RUN_MASK;
*op++ = RUN_MASK << ML_BITS;
@ -809,22 +820,7 @@ _last_literals:
op += lastRun;
}
retval = (((char*)op)-dest);
_clean_up:
if (dictDirective == usingDictCtx) {
/* Subsequent linked blocks can't use the dictionary. */
/* Instead, they use the block we just compressed. */
cctx->dictCtx = NULL;
cctx->dictSize = (U32)inputSize;
} else {
cctx->dictSize += (U32)inputSize;
}
cctx->currentOffset += (U32)inputSize;
cctx->tableType = tableType;
/* End */
return (int)retval;
return (int)(((char*)op) - dest);
}