blob: 133d95b3885380d67e0b75e4ccc2b8c42838b72c (
plain)
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
|
// InBuffer.cpp
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "InBuffer.h"
CInBufferBase::CInBufferBase() throw():
_buf(0),
_bufLim(0),
_bufBase(0),
_stream(0),
_processedSize(0),
_bufSize(0),
_wasFinished(false),
NumExtraBytes(0)
{}
bool CInBuffer::Create(size_t bufSize) throw()
{
const unsigned kMinBlockSize = 1;
if (bufSize < kMinBlockSize)
bufSize = kMinBlockSize;
if (_bufBase != 0 && _bufSize == bufSize)
return true;
Free();
_bufSize = bufSize;
_bufBase = (Byte *)::MidAlloc(bufSize);
return (_bufBase != 0);
}
void CInBuffer::Free() throw()
{
::MidFree(_bufBase);
_bufBase = 0;
}
void CInBufferBase::Init() throw()
{
_processedSize = 0;
_buf = _bufBase;
_bufLim = _buf;
_wasFinished = false;
#ifdef _NO_EXCEPTIONS
ErrorCode = S_OK;
#endif
NumExtraBytes = 0;
}
bool CInBufferBase::ReadBlock()
{
#ifdef _NO_EXCEPTIONS
if (ErrorCode != S_OK)
return false;
#endif
if (_wasFinished)
return false;
_processedSize += (_buf - _bufBase);
_buf = _bufBase;
_bufLim = _bufBase;
UInt32 processed;
// FIX_ME: we can improve it to support (_bufSize >= (1 << 32))
HRESULT result = _stream->Read(_bufBase, (UInt32)_bufSize, &processed);
#ifdef _NO_EXCEPTIONS
ErrorCode = result;
#else
if (result != S_OK)
throw CInBufferException(result);
#endif
_bufLim = _buf + processed;
_wasFinished = (processed == 0);
return !_wasFinished;
}
bool CInBufferBase::ReadByte_FromNewBlock(Byte &b)
{
if (!ReadBlock())
{
NumExtraBytes++;
b = 0xFF;
return false;
}
b = *_buf++;
return true;
}
Byte CInBufferBase::ReadByte_FromNewBlock()
{
if (!ReadBlock())
{
NumExtraBytes++;
return 0xFF;
}
return *_buf++;
}
size_t CInBufferBase::ReadBytes(Byte *buf, size_t size)
{
if ((size_t)(_bufLim - _buf) >= size)
{
const Byte *src = _buf;
for (size_t i = 0; i < size; i++)
buf[i] = src[i];
_buf += size;
return size;
}
for (size_t i = 0; i < size; i++)
{
if (_buf >= _bufLim)
if (!ReadBlock())
return i;
buf[i] = *_buf++;
}
return size;
}
size_t CInBufferBase::Skip(size_t size)
{
size_t processed = 0;
for (;;)
{
size_t rem = (_bufLim - _buf);
if (rem >= size)
{
_buf += size;
return processed + size;
}
_buf += rem;
processed += rem;
size -= rem;
if (!ReadBlock())
return processed;
}
}
|
