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/* 7zDecode.c */
#include "7zDecode.h"
#ifdef _SZ_ONE_DIRECTORY
#include "LzmaDecode.h"
#else
#include "../../Compress/LZMA_C/LzmaDecode.h"
#endif
CMethodID k_Copy = { { 0x0 }, 1 };
CMethodID k_LZMA = { { 0x3, 0x1, 0x1 }, 3 };
#ifdef _LZMA_IN_CB
typedef struct _CLzmaInCallbackImp
{
ILzmaInCallback InCallback;
ISzInStream *InStream;
size_t Size;
} CLzmaInCallbackImp;
int LzmaReadImp(void *object, const unsigned char **buffer, SizeT *size)
{
CLzmaInCallbackImp *cb = (CLzmaInCallbackImp *)object;
size_t processedSize;
SZ_RESULT res;
*size = 0;
res = cb->InStream->Read((void *)cb->InStream, (void **)buffer, cb->Size, &processedSize);
*size = (SizeT)processedSize;
if (processedSize > cb->Size)
return (int)SZE_FAIL;
cb->Size -= processedSize;
if (res == SZ_OK)
return 0;
return (int)res;
}
#endif
SZ_RESULT SzDecode(const CFileSize *packSizes, const CFolder *folder,
#ifdef _LZMA_IN_CB
ISzInStream *inStream,
#else
const Byte *inBuffer,
#endif
Byte *outBuffer, size_t outSize,
size_t *outSizeProcessed, ISzAlloc *allocMain)
{
UInt32 si;
size_t inSize = 0;
CCoderInfo *coder;
if (folder->NumPackStreams != 1)
return SZE_NOTIMPL;
if (folder->NumCoders != 1)
return SZE_NOTIMPL;
coder = folder->Coders;
*outSizeProcessed = 0;
for (si = 0; si < folder->NumPackStreams; si++)
inSize += (size_t)packSizes[si];
if (AreMethodsEqual(&coder->MethodID, &k_Copy))
{
size_t i;
if (inSize != outSize)
return SZE_DATA_ERROR;
#ifdef _LZMA_IN_CB
for (i = 0; i < inSize;)
{
size_t j;
Byte *inBuffer;
size_t bufferSize;
RINOK(inStream->Read((void *)inStream, (void **)&inBuffer, inSize - i, &bufferSize));
if (bufferSize == 0)
return SZE_DATA_ERROR;
if (bufferSize > inSize - i)
return SZE_FAIL;
*outSizeProcessed += bufferSize;
for (j = 0; j < bufferSize && i < inSize; j++, i++)
outBuffer[i] = inBuffer[j];
}
#else
for (i = 0; i < inSize; i++)
outBuffer[i] = inBuffer[i];
*outSizeProcessed = inSize;
#endif
return SZ_OK;
}
if (AreMethodsEqual(&coder->MethodID, &k_LZMA))
{
#ifdef _LZMA_IN_CB
CLzmaInCallbackImp lzmaCallback;
#else
SizeT inProcessed;
#endif
CLzmaDecoderState state; /* it's about 24-80 bytes structure, if int is 32-bit */
int result;
SizeT outSizeProcessedLoc;
#ifdef _LZMA_IN_CB
lzmaCallback.Size = inSize;
lzmaCallback.InStream = inStream;
lzmaCallback.InCallback.Read = LzmaReadImp;
#endif
if (LzmaDecodeProperties(&state.Properties, coder->Properties.Items,
coder->Properties.Capacity) != LZMA_RESULT_OK)
return SZE_FAIL;
state.Probs = (CProb *)allocMain->Alloc(LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
if (state.Probs == 0)
return SZE_OUTOFMEMORY;
#ifdef _LZMA_OUT_READ
if (state.Properties.DictionarySize == 0)
state.Dictionary = 0;
else
{
state.Dictionary = (unsigned char *)allocMain->Alloc(state.Properties.DictionarySize);
if (state.Dictionary == 0)
{
allocMain->Free(state.Probs);
return SZE_OUTOFMEMORY;
}
}
LzmaDecoderInit(&state);
#endif
result = LzmaDecode(&state,
#ifdef _LZMA_IN_CB
&lzmaCallback.InCallback,
#else
inBuffer, (SizeT)inSize, &inProcessed,
#endif
outBuffer, (SizeT)outSize, &outSizeProcessedLoc);
*outSizeProcessed = (size_t)outSizeProcessedLoc;
allocMain->Free(state.Probs);
#ifdef _LZMA_OUT_READ
allocMain->Free(state.Dictionary);
#endif
if (result == LZMA_RESULT_DATA_ERROR)
return SZE_DATA_ERROR;
if (result != LZMA_RESULT_OK)
return SZE_FAIL;
return SZ_OK;
}
return SZE_NOTIMPL;
}
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