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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "common/stdafx.h"
#include "common/stream.h"
#include "common/str.h"
#include "common/util.h"
namespace Common {
void WriteStream::writeString(const String &str) {
write(str.c_str(), str.size());
}
MemoryReadStream *ReadStream::readStream(uint32 dataSize) {
void *buf = malloc(dataSize);
dataSize = read(buf, dataSize);
assert(dataSize > 0);
return new MemoryReadStream((byte *)buf, dataSize, true);
}
uint32 MemoryReadStream::read(void *dataPtr, uint32 dataSize) {
// Read at most as many bytes as are still available...
if (dataSize > _size - _pos)
dataSize = _size - _pos;
memcpy(dataPtr, _ptr, dataSize);
if (_encbyte) {
byte *p = (byte *)dataPtr;
byte *end = p + dataSize;
while (p < end)
*p++ ^= _encbyte;
}
_ptr += dataSize;
_pos += dataSize;
return dataSize;
}
void MemoryReadStream::seek(int32 offs, int whence) {
// Pre-Condition
assert(_pos <= _size);
switch (whence) {
case SEEK_END:
// SEEK_END works just like SEEK_SET, only 'reversed',
// i.e. from the end.
offs = _size - offs;
// Fall through
case SEEK_SET:
_ptr = _ptrOrig + offs;
_pos = offs;
break;
case SEEK_CUR:
_ptr += offs;
_pos += offs;
break;
}
// Post-Condition
assert(_pos <= _size);
}
#define LF 0x0A
#define CR 0x0D
char *SeekableReadStream::readLine(char *buf, size_t bufSize) {
assert(buf && bufSize > 0);
char *p = buf;
size_t len = 0;
char c;
if (buf == 0 || bufSize == 0 || eos()) {
return 0;
}
// We don't include the newline character(s) in the buffer, and we
// always terminate it - we never read more than len-1 characters.
// EOF is treated as a line break, unless it was the first character
// that was read.
// 0 is treated as a line break, even though it should never occur in
// a text file.
// DOS and Windows use CRLF line breaks
// Unix and OS X use LF line breaks
// Macintosh before OS X uses CR line breaks
c = readByte();
if (eos() || ioFailed()) {
return 0;
}
while (!eos() && len + 1 < bufSize) {
if (ioFailed())
return 0;
if (c == 0 || c == LF)
break;
if (c == CR) {
c = readByte();
if (c != LF && !eos())
seek(-1, SEEK_CUR);
break;
}
*p++ = c;
len++;
c = readByte();
}
// This should fix a bug while using readLine with Common::File
// it seems that it sets the eos flag after an invalid read
// and at the same time the ioFailed flag
// the config file parser fails out of that reason for the new themes
if (eos()) {
clearIOFailed();
}
*p = 0;
return buf;
}
uint32 SubReadStream::read(void *dataPtr, uint32 dataSize) {
dataSize = MIN(dataSize, _end - _pos);
dataSize = _parentStream->read(dataPtr, dataSize);
_pos += dataSize;
return dataSize;
}
SeekableSubReadStream::SeekableSubReadStream(SeekableReadStream *parentStream, uint32 begin, uint32 end, bool disposeParentStream)
: SubReadStream(parentStream, end, disposeParentStream),
_parentStream(parentStream),
_begin(begin) {
assert(_begin <= _end);
_pos = _begin;
_parentStream->seek(_pos);
}
void SeekableSubReadStream::seek(int32 offset, int whence) {
assert(_pos >= _begin);
assert(_pos <= _end);
switch(whence) {
case SEEK_END:
offset = size() - offset;
// fallthrough
case SEEK_SET:
_pos = _begin + offset;
break;
case SEEK_CUR:
_pos += offset;
}
assert(_pos >= _begin);
assert(_pos <= _end);
_parentStream->seek(_pos);
}
} // End of namespace Common
|
