summaryrefslogtreecommitdiffstats
path: root/C/Lzma86Enc.c
diff options
context:
space:
mode:
Diffstat (limited to 'C/Lzma86Enc.c')
-rwxr-xr-xC/Lzma86Enc.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/C/Lzma86Enc.c b/C/Lzma86Enc.c
new file mode 100755
index 0000000..a29c605
--- /dev/null
+++ b/C/Lzma86Enc.c
@@ -0,0 +1,108 @@
+/* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder
+2009-08-14 : Igor Pavlov : Public domain */
+
+#include <string.h>
+
+#include "Lzma86.h"
+
+#include "Alloc.h"
+#include "Bra.h"
+#include "LzmaEnc.h"
+
+#define SZE_OUT_OVERFLOW SZE_DATA_ERROR
+
+static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }
+static void SzFree(void *p, void *address) { p = p; MyFree(address); }
+
+int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen,
+ int level, UInt32 dictSize, int filterMode)
+{
+ ISzAlloc g_Alloc = { SzAlloc, SzFree };
+ size_t outSize2 = *destLen;
+ Byte *filteredStream;
+ Bool useFilter;
+ int mainResult = SZ_ERROR_OUTPUT_EOF;
+ CLzmaEncProps props;
+ LzmaEncProps_Init(&props);
+ props.level = level;
+ props.dictSize = dictSize;
+
+ *destLen = 0;
+ if (outSize2 < LZMA86_HEADER_SIZE)
+ return SZ_ERROR_OUTPUT_EOF;
+
+ {
+ int i;
+ UInt64 t = srcLen;
+ for (i = 0; i < 8; i++, t >>= 8)
+ dest[LZMA86_SIZE_OFFSET + i] = (Byte)t;
+ }
+
+ filteredStream = 0;
+ useFilter = (filterMode != SZ_FILTER_NO);
+ if (useFilter)
+ {
+ if (srcLen != 0)
+ {
+ filteredStream = (Byte *)MyAlloc(srcLen);
+ if (filteredStream == 0)
+ return SZ_ERROR_MEM;
+ memcpy(filteredStream, src, srcLen);
+ }
+ {
+ UInt32 x86State;
+ x86_Convert_Init(x86State);
+ x86_Convert(filteredStream, srcLen, 0, &x86State, 1);
+ }
+ }
+
+ {
+ size_t minSize = 0;
+ Bool bestIsFiltered = False;
+
+ /* passes for SZ_FILTER_AUTO:
+ 0 - BCJ + LZMA
+ 1 - LZMA
+ 2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better.
+ */
+ int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1;
+
+ int i;
+ for (i = 0; i < numPasses; i++)
+ {
+ size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE;
+ size_t outPropsSize = 5;
+ SRes curRes;
+ Bool curModeIsFiltered = (numPasses > 1 && i == numPasses - 1);
+ if (curModeIsFiltered && !bestIsFiltered)
+ break;
+ if (useFilter && i == 0)
+ curModeIsFiltered = True;
+
+ curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed,
+ curModeIsFiltered ? filteredStream : src, srcLen,
+ &props, dest + 1, &outPropsSize, 0,
+ NULL, &g_Alloc, &g_Alloc);
+
+ if (curRes != SZ_ERROR_OUTPUT_EOF)
+ {
+ if (curRes != SZ_OK)
+ {
+ mainResult = curRes;
+ break;
+ }
+ if (outSizeProcessed <= minSize || mainResult != SZ_OK)
+ {
+ minSize = outSizeProcessed;
+ bestIsFiltered = curModeIsFiltered;
+ mainResult = SZ_OK;
+ }
+ }
+ }
+ dest[0] = (bestIsFiltered ? 1 : 0);
+ *destLen = LZMA86_HEADER_SIZE + minSize;
+ }
+ if (useFilter)
+ MyFree(filteredStream);
+ return mainResult;
+}