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
|
/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/membuf.h"
using namespace Bu;
Bu::MemBuf::MemBuf() :
nPos( 0 )
{
}
Bu::MemBuf::MemBuf( const Bu::FString &str ) :
sBuf( str ),
nPos( 0 )
{
}
Bu::MemBuf::~MemBuf()
{
}
void Bu::MemBuf::close()
{
}
size_t Bu::MemBuf::read( void *pBuf, size_t nBytes )
{
if( (size_t)sBuf.getSize()-(size_t)nPos < nBytes )
nBytes = sBuf.getSize()-nPos;
memcpy( pBuf, sBuf.getStr()+nPos, nBytes );
nPos += nBytes;
return nBytes;
}
size_t Bu::MemBuf::write( const void *pBuf, size_t nBytes )
{
if( nPos == sBuf.getSize() )
{
// Easiest, just append the data.
sBuf.append( (const char *)pBuf, nBytes );
nPos += nBytes;
return nBytes;
}
else
{
// Trickier, we must do this in two parts, overwrite, then append
// Frist, overwrite.
size_t iOver = sBuf.getSize() - nPos;
if( iOver > nBytes )
iOver = nBytes;
memcpy( sBuf.getStr()+nPos, pBuf, iOver );
// Then append
if( iOver < nBytes )
{
sBuf.append( ((const char *)pBuf)+iOver, nBytes-iOver );
}
nPos += nBytes;
return nBytes;
}
}
long Bu::MemBuf::tell()
{
return nPos;
}
void Bu::MemBuf::seek( long offset )
{
nPos += offset;
if( nPos < 0 ) nPos = 0;
else if( nPos > sBuf.getSize() ) nPos = sBuf.getSize();
}
void Bu::MemBuf::setPos( long pos )
{
nPos = pos;
if( nPos < 0 ) nPos = 0;
else if( nPos > sBuf.getSize() ) nPos = sBuf.getSize();
}
void Bu::MemBuf::setPosEnd( long pos )
{
nPos = sBuf.getSize()-pos;
if( nPos < 0 ) nPos = 0;
else if( nPos > sBuf.getSize() ) nPos = sBuf.getSize();
}
bool Bu::MemBuf::isEos()
{
return (nPos == sBuf.getSize());
}
bool Bu::MemBuf::isOpen()
{
return true;
}
void Bu::MemBuf::flush()
{
}
bool Bu::MemBuf::canRead()
{
return !isEos();
}
bool Bu::MemBuf::canWrite()
{
return true;
}
bool Bu::MemBuf::isReadable()
{
return true;
}
bool Bu::MemBuf::isWritable()
{
return true;
}
bool Bu::MemBuf::isSeekable()
{
return true;
}
bool Bu::MemBuf::isBlocking()
{
return true;
}
void Bu::MemBuf::setBlocking( bool )
{
}
Bu::FString &Bu::MemBuf::getString()
{
return sBuf;
}
|
