7zDecode.c
1
2
3
/* 7zDecode.c */
#include "7zDecode.h"
4
5
6
7
8
#ifdef _SZ_ONE_DIRECTORY
#include "LzmaDecode.h"
#else
#include "../../Compress/LZMA_C/LzmaDecode.h"
#endif
9
10
11
12
13
14
15
16
17
18
19
20
21
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;
22
int LzmaReadImp(void *object, const unsigned char **buffer, SizeT *size)
23
24
25
26
27
28
{
CLzmaInCallbackImp *cb = (CLzmaInCallbackImp *)object;
size_t processedSize;
SZ_RESULT res;
*size = 0;
res = cb->InStream->Read((void *)cb->InStream, (void **)buffer, cb->Size, &processedSize);
29
*size = (SizeT)processedSize;
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
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;
71
void *inBuffer;
72
73
74
75
76
77
78
79
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++)
80
outBuffer[i] = ((Byte*)inBuffer)[j];
81
82
83
84
85
86
87
88
89
90
91
92
93
94
}
#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
95
SizeT inProcessed;
96
97
98
99
#endif
CLzmaDecoderState state; /* it's about 24-80 bytes structure, if int is 32-bit */
int result;
100
SizeT outSizeProcessedLoc;
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
#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
135
inBuffer, (SizeT)inSize, &inProcessed,
137
outBuffer, (SizeT)outSize, &outSizeProcessedLoc);
138
139
140
141
142
143
144
145
146
147
148
149
150
*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;
}