4.20

7zip/Compress/LZMA_Alone/LzmaRamDecode.c

@@ -0,0 +1,88 @@
+/* LzmaRamDecode.c */
+
+#include "LzmaRamDecode.h"
+#ifdef _SZ_ONE_DIRECTORY
+#include "LzmaDecode.h"
+#include "BranchX86.h"
+#else
+#include "../LZMA_C/LzmaDecode.h"
+#include "../Branch/BranchX86.h"
+#endif
+
+#define LZMA_PROPS_SIZE 14
+#define LZMA_SIZE_OFFSET 6
+
+int LzmaRamGetUncompressedSize(
+    unsigned char *inBuffer, 
+    size_t inSize,
+    size_t *outSize)
+{
+  unsigned int i;
+  if (inSize < LZMA_PROPS_SIZE)
+    return 1;
+  *outSize = 0;
+  for(i = 0; i < sizeof(size_t); i++)
+    *outSize += ((size_t)inBuffer[LZMA_SIZE_OFFSET + i]) << (8 * i);
+  for(; i < 8; i++)
+    if (inBuffer[LZMA_SIZE_OFFSET + i] != 0)
+      return 1;
+  return 0;
+}
+
+#define SZE_DATA_ERROR (1)
+#define SZE_OUTOFMEMORY (2)
+
+int LzmaRamDecompress(
+    unsigned char *inBuffer, 
+    size_t inSize,
+    unsigned char *outBuffer,
+    size_t outSize,
+    size_t *outSizeProcessed,
+    void * (*allocFunc)(size_t size), 
+    void (*freeFunc)(void *))
+{
+  int lc, lp, pb;
+  size_t lzmaInternalSize;
+  void *lzmaInternalData;
+  int result;
+  UInt32 outSizeProcessedLoc;
+  
+  int useFilter = inBuffer[0];
+
+  *outSizeProcessed = 0;
+  if (useFilter > 1)
+    return 1;
+
+  if (inSize < LZMA_PROPS_SIZE)
+    return 1;
+  lc = inBuffer[1];
+  if (lc >= (9 * 5 * 5))
+    return 1;
+  for (pb = 0; lc >= (9 * 5); pb++, lc -= (9 * 5));
+  for (lp = 0; lc >= 9; lp++, lc -= 9);
+  
+  lzmaInternalSize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp))) * sizeof(CProb);
+  lzmaInternalData = allocFunc(lzmaInternalSize);
+  if (lzmaInternalData == 0)
+    return SZE_OUTOFMEMORY;
+  
+  result = LzmaDecode((unsigned char *)lzmaInternalData, (UInt32)lzmaInternalSize,
+    lc, lp, pb,
+    inBuffer + LZMA_PROPS_SIZE, (UInt32)inSize - LZMA_PROPS_SIZE,
+    outBuffer, (UInt32)outSize, 
+    &outSizeProcessedLoc);
+  freeFunc(lzmaInternalData);
+  if (result != LZMA_RESULT_OK)
+    return 1;
+  *outSizeProcessed = (size_t)outSizeProcessedLoc;
+  if (useFilter == 1)
+  {
+    UInt32 _prevMask;
+    UInt32 _prevPos;
+    x86_Convert_Init(_prevMask, _prevPos);
+    x86_Convert(outBuffer, (UInt32)outSizeProcessedLoc, 0, &_prevMask, &_prevPos, 0);
+  }
+  return 0;
+}
+
+