lzma/7zDecode.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 11 Apr 2006 15:01:15 +0000
changeset 775 a8cc6b8a8e9c
parent 774 916c2e81e77f
child 780 8d029fecde3a
permissions -rw-r--r--
Some minor fixes and cleanups.
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/* 7zDecode.c */
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#include "7zDecode.h"
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#include "LzmaStateDecode.h" /* NOTE : Modified to use LzmaStateDecode(.c,.h) instead of LzmaDecode(.c,.h) and hardcoded _SZ_ONE_DIRECTORY behaviour */
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CMethodID k_Copy = { { 0x0 }, 1 };
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CMethodID k_LZMA = { { 0x3, 0x1, 0x1 }, 3 };
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#ifdef _LZMA_IN_CB
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typedef struct _CLzmaInCallbackImp
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{
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  ILzmaInCallback InCallback;
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  ISzInStream *InStream;
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  size_t Size;
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} CLzmaInCallbackImp;
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int LzmaReadImp(void *object, const unsigned char **buffer, size_t *size)
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{
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  CLzmaInCallbackImp *cb = (CLzmaInCallbackImp *)object;
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  size_t processedSize;
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  SZ_RESULT res;
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  *size = 0;
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  res = cb->InStream->Read((void *)cb->InStream, (void **)buffer, cb->Size, &processedSize);
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  *size = (size_t)processedSize;
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  if (processedSize > cb->Size)
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    return (int)SZE_FAIL;
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  cb->Size -= processedSize;
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  if (res == SZ_OK)
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    return 0;
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  return (int)res;
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}
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#endif
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SZ_RESULT SzDecode(const CFileSize *packSizes, const CFolder *folder,
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    #ifdef _LZMA_IN_CB
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    ISzInStream *inStream,
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    #else
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    const Byte *inBuffer,
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    #endif
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    Byte *outBuffer, size_t outSize,
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    size_t *outSizeProcessed, ISzAlloc *allocMain)
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{
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  UInt32 si;
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  size_t inSize = 0;
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  CCoderInfo *coder;
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  if (folder->NumPackStreams != 1)
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    return SZE_NOTIMPL;
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  if (folder->NumCoders != 1)
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    return SZE_NOTIMPL;
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  coder = folder->Coders;
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  *outSizeProcessed = 0;
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  for (si = 0; si < folder->NumPackStreams; si++)
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    inSize += (size_t)packSizes[si];
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  if (AreMethodsEqual(&coder->MethodID, &k_Copy))
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  {
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    size_t i;
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    if (inSize != outSize)
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      return SZE_DATA_ERROR;
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    #ifdef _LZMA_IN_CB
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    for (i = 0; i < inSize;)
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    {
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      size_t j;
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      Byte *inBuffer;
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      size_t bufferSize;
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      RINOK(inStream->Read((void *)inStream,  (void **)&inBuffer, inSize - i, &bufferSize));
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      if (bufferSize == 0)
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        return SZE_DATA_ERROR;
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      if (bufferSize > inSize - i)
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        return SZE_FAIL;
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      *outSizeProcessed += bufferSize;
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      for (j = 0; j < bufferSize && i < inSize; j++, i++)
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        outBuffer[i] = inBuffer[j];
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    }
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    #else
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    for (i = 0; i < inSize; i++)
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      outBuffer[i] = inBuffer[i];
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    *outSizeProcessed = inSize;
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    #endif
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    return SZ_OK;
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  }
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  if (AreMethodsEqual(&coder->MethodID, &k_LZMA))
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  {
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    #ifdef _LZMA_IN_CB
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    CLzmaInCallbackImp lzmaCallback;
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    #else
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    size_t inProcessed;
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    #endif
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    CLzmaDecoderState state;  /* it's about 24-80 bytes structure, if int is 32-bit */
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    int result;
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    size_t outSizeProcessedLoc;
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    #ifdef _LZMA_IN_CB
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    lzmaCallback.Size = inSize;
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    lzmaCallback.InStream = inStream;
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    lzmaCallback.InCallback.Read = LzmaReadImp;
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    #endif
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    if (LzmaDecodeProperties(&state.Properties, coder->Properties.Items,
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        coder->Properties.Capacity) != LZMA_RESULT_OK)
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      return SZE_FAIL;
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    state.Probs = (CProb *)allocMain->Alloc(LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
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    if (state.Probs == 0)
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      return SZE_OUTOFMEMORY;
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    #ifdef _LZMA_OUT_READ
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    if (state.Properties.DictionarySize == 0)
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      state.Dictionary = 0;
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    else
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    {
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      state.Dictionary = (unsigned char *)allocMain->Alloc(state.Properties.DictionarySize);
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      if (state.Dictionary == 0)
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      {
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        allocMain->Free(state.Probs);
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        return SZE_OUTOFMEMORY;
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      }
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    }
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    LzmaDecoderInit(&state);
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    #endif
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    result = LzmaDecode(&state,
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        #ifdef _LZMA_IN_CB
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        &lzmaCallback.InCallback,
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        #else
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        inBuffer, (size_t)inSize, &inProcessed,
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        #endif
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        outBuffer, (size_t)outSize, &outSizeProcessedLoc,
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	1); /* NOTE : Added by Dennis Schridde to make SzDecode be compatible with LzmaStateDecode(.c,.h) */
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    *outSizeProcessed = (size_t)outSizeProcessedLoc;
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    allocMain->Free(state.Probs);
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    #ifdef _LZMA_OUT_READ
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    allocMain->Free(state.Dictionary);
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    #endif
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    if (result == LZMA_RESULT_DATA_ERROR)
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      return SZE_DATA_ERROR;
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    if (result != LZMA_RESULT_OK)
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      return SZE_FAIL;
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    return SZ_OK;
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  }
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  return SZE_NOTIMPL;
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}