'21.07'21.07

1 files changed, 104 insertions, 0 deletions

diff --git a/C/Lzma86Enc.c b/C/Lzma86Enc.c
new file mode 100644
index 0000000..14fcd65
--- /dev/null
+++ b/C/Lzma86Enc.c
@@ -0,0 +1,104 @@
+/* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder
+2018-07-04 : Igor Pavlov : Public domain */
+
+#include "Precomp.h"
+
+#include <string.h>
+
+#include "Lzma86.h"
+
+#include "Alloc.h"
+#include "Bra.h"
+#include "LzmaEnc.h"
+
+int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen,
+    int level, UInt32 dictSize, int filterMode)
+{
+  size_t outSize2 = *destLen;
+  Byte *filteredStream;
+  BoolInt 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;
+    BoolInt 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;
+      BoolInt 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] = (Byte)(bestIsFiltered ? 1 : 0);
+    *destLen = LZMA86_HEADER_SIZE + minSize;
+  }
+  if (useFilter)
+    MyFree(filteredStream);
+  return mainResult;
+}