mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-11-01 16:35:16 +01:00
362 lines
10 KiB
C
362 lines
10 KiB
C
/* 7zDecode.c */
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#include "7zDecode.h"
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#ifdef _SZ_ONE_DIRECTORY
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#include "LzmaDecode.h"
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#else
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#include "../../Compress/LZMA_C/LzmaDecode.h"
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#endif
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#ifdef _LZMA_OUT_READ
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#include <string.h> // for memcpy
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#endif
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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, SizeT *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 = (SizeT)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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SizeT 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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SizeT 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_OUTOFMEMORYDIC;
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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, (SizeT)inSize, &inProcessed,
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#endif
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outBuffer, (SizeT)outSize, &outSizeProcessedLoc);
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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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}
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#ifdef _LZMA_OUT_READ
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// like SzDecode but uses less memory
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SZ_RESULT SzDecode2(const CFileSize *packSizes, const CFolder *folder,
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ISzInStream *inStream,
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Byte *outBuffer, size_t outSize,
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size_t *outSizeProcessed, ISzAlloc *allocMain,
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size_t *fileOffset, size_t *fileSize)
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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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SizeT 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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SizeT 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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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_OUTOFMEMORYDIC;
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}
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}
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LzmaDecoderInit(&state);
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// allocate memory for the temporary buffer
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Byte *tmpBuffer = (Byte *)allocMain->Alloc(_LZMA_TEMP_BUFFER_SIZE);
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// variables containing the number of the first and the last bytes of the buffer
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size_t bufferStart, bufferEnd;
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bufferStart = bufferEnd = 0;
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// integers contains the offset, the size and the already copied data which will be
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// copied from the tmpBuffer to outBuffer
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size_t copyOffset, copySize, copyDone;
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copyOffset = copySize = copyDone = 0;
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UInt32 i = 0;
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int bytesToCopy = 0;
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// decompress data in _LZMA_TEMP_BUFFER_SIZE byte steps and copy the wanted file to outBuffer
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do
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{
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if((*fileSize - copyDone) >= _LZMA_TEMP_BUFFER_SIZE)
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bytesToCopy = _LZMA_TEMP_BUFFER_SIZE;
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else
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bytesToCopy = (*fileSize - copyDone);
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// decompress next bytes
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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, (SizeT)inSize, &inProcessed, //TODO!
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#endif
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tmpBuffer, bytesToCopy, &outSizeProcessedLoc
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);
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// check result
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if(result == LZMA_RESULT_DATA_ERROR)
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{
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return SZE_DATA_ERROR;
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}
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if(result != LZMA_RESULT_OK)
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{
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return SZE_FAIL;
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}
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// normally this should never happen
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if(outSizeProcessedLoc > _LZMA_TEMP_BUFFER_SIZE)
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{
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return SZE_FAIL;
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}
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// update bufferStart and bufferEnd
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bufferStart = _LZMA_TEMP_BUFFER_SIZE * i;
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bufferEnd = bufferStart + outSizeProcessedLoc;
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i++;
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// calculate copy offset and size
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if(*fileOffset > bufferEnd)
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{
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// we haven't reached the start of the file yet
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continue;
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}
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// calculate offset
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if(*fileOffset < bufferStart)
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{
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// the file has already started before this decompression step
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copyOffset = 0;
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}
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else
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{
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// the file starts somewhere inside this buffer
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copyDone = 0;
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copyOffset = _LZMA_TEMP_BUFFER_SIZE - (bufferEnd - *fileOffset);
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}
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// calculate size
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if((*fileOffset + *fileSize) > bufferEnd)
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{
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// we'll need the whole buffer after copyOffset
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copySize = _LZMA_TEMP_BUFFER_SIZE - copyOffset;
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}
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else
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{
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// we'll stop somewhere inside the buffer
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copySize = (*fileOffset + *fileSize) - (bufferStart + copyOffset);
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}
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// copy bytes to the real output buffer
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if(copySize == 0)
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{
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continue;
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}
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// printf("memcpy(outBuffer + %d, tmpBuffer + %d, %d)\n", copyDone, copyOffset, copySize);
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memcpy(outBuffer + copyDone, tmpBuffer + copyOffset, copySize);
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copyDone += copySize;
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}
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while((*fileOffset + *fileSize) > bufferEnd);
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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, (SizeT)inSize, &inProcessed,
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#endif
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outBuffer, (SizeT)outSize, &outSizeProcessedLoc);*/
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//*outSizeProcessed = (size_t)outSizeProcessedLoc;
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*outSizeProcessed = copyDone;
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allocMain->Free(tmpBuffer); // free the temporary buffer again
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allocMain->Free(state.Probs);
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allocMain->Free(state.Dictionary);
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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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}
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#endif
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