1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
#include "rar.hpp"
RawRead::RawRead()
{
RawRead::SrcFile=NULL;
Reset();
}
RawRead::RawRead(File *SrcFile)
{
RawRead::SrcFile=SrcFile;
Reset();
}
void RawRead::Reset()
{
Data.SoftReset();
ReadPos=0;
DataSize=0;
#ifndef SHELL_EXT
Crypt=NULL;
#endif
}
size_t RawRead::Read(size_t Size)
{
size_t ReadSize=0;
#if !defined(SHELL_EXT) && !defined(RAR_NOCRYPT)
if (Crypt!=NULL)
{
// Full size of buffer with already read data including data read
// for encryption block alignment.
size_t FullSize=Data.Size();
// Data read for alignment and not processed yet.
size_t DataLeft=FullSize-DataSize;
if (Size>DataLeft) // Need to read more than we already have.
{
size_t SizeToRead=Size-DataLeft;
size_t AlignedReadSize=SizeToRead+((~SizeToRead+1) & CRYPT_BLOCK_MASK);
Data.Add(AlignedReadSize);
ReadSize=SrcFile->Read(&Data[FullSize],AlignedReadSize);
Crypt->DecryptBlock(&Data[FullSize],AlignedReadSize);
DataSize+=ReadSize==0 ? 0:Size;
}
else // Use buffered data, no real read.
{
ReadSize=Size;
DataSize+=Size;
}
}
else
#endif
if (Size!=0)
{
Data.Add(Size);
ReadSize=SrcFile->Read(&Data[DataSize],Size);
DataSize+=ReadSize;
}
return ReadSize;
}
void RawRead::Read(byte *SrcData,size_t Size)
{
if (Size!=0)
{
Data.Add(Size);
memcpy(&Data[DataSize],SrcData,Size);
DataSize+=Size;
}
}
byte RawRead::Get1()
{
return ReadPos<DataSize ? Data[ReadPos++]:0;
}
ushort RawRead::Get2()
{
if (ReadPos+1<DataSize)
{
ushort Result=Data[ReadPos]+(Data[ReadPos+1]<<8);
ReadPos+=2;
return Result;
}
return 0;
}
uint RawRead::Get4()
{
if (ReadPos+3<DataSize)
{
uint Result=Data[ReadPos]+(Data[ReadPos+1]<<8)+(Data[ReadPos+2]<<16)+
(Data[ReadPos+3]<<24);
ReadPos+=4;
return Result;
}
return 0;
}
uint64 RawRead::Get8()
{
uint Low=Get4(),High=Get4();
return INT32TO64(High,Low);
}
uint64 RawRead::GetV()
{
uint64 Result=0;
for (uint Shift=0;ReadPos<DataSize;Shift+=7)
{
byte CurByte=Data[ReadPos++];
Result+=uint64(CurByte & 0x7f)<<Shift;
if ((CurByte & 0x80)==0)
return Result; // Decoded successfully.
}
return 0; // Out of buffer border.
}
// Return a number of bytes in current variable length integer.
uint RawRead::GetVSize(size_t Pos)
{
for (size_t CurPos=Pos;CurPos<DataSize;CurPos++)
if ((Data[CurPos] & 0x80)==0)
return int(CurPos-Pos+1);
return 0; // Buffer overflow.
}
size_t RawRead::GetB(void *Field,size_t Size)
{
byte *F=(byte *)Field;
size_t CopySize=Min(DataSize-ReadPos,Size);
if (CopySize>0)
memcpy(F,&Data[ReadPos],CopySize);
if (Size>CopySize)
memset(F+CopySize,0,Size-CopySize);
ReadPos+=CopySize;
return CopySize;
}
void RawRead::GetW(wchar *Field,size_t Size)
{
if (ReadPos+2*Size-1<DataSize)
{
RawToWide(&Data[ReadPos],Field,Size);
ReadPos+=sizeof(wchar)*Size;
}
else
memset(Field,0,sizeof(wchar)*Size);
}
uint RawRead::GetCRC15(bool ProcessedOnly) // RAR 1.5 block CRC.
{
if (DataSize<=2)
return 0;
uint HeaderCRC=CRC32(0xffffffff,&Data[2],(ProcessedOnly ? ReadPos:DataSize)-2);
return ~HeaderCRC & 0xffff;
}
uint RawRead::GetCRC50() // RAR 5.0 block CRC.
{
if (DataSize<=4)
return 0xffffffff;
return CRC32(0xffffffff,&Data[4],DataSize-4) ^ 0xffffffff;
}
// Read vint from arbitrary byte array.
uint64 RawGetV(const byte *Data,uint &ReadPos,uint DataSize,bool &Overflow)
{
Overflow=false;
uint64 Result=0;
for (uint Shift=0;ReadPos<DataSize;Shift+=7)
{
byte CurByte=Data[ReadPos++];
Result+=uint64(CurByte & 0x7f)<<Shift;
if ((CurByte & 0x80)==0)
return Result; // Decoded successfully.
}
Overflow=true;
return 0; // Out of buffer border.
}
|
