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
|
/* 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.
*
*/
#include "startrek/filestream.h"
namespace StarTrek {
FileStream::FileStream(Common::SeekableReadStream *stream, bool bigEndian) {
_bigEndian = bigEndian;
_pos = 0;
_size = stream->size();
_data = new byte[_size];
stream->read(_data, _size);
delete stream;
}
FileStream::~FileStream() {
delete[] _data;
}
// ReadStream functions
uint32 FileStream::read(void *dataPtr, uint32 dataSize) {
if (_pos + dataSize > (uint32)size())
dataSize = size() - _pos;
memcpy(dataPtr, _data + _pos, dataSize);
_pos += dataSize;
return dataSize;
}
byte FileStream::readByte() {
assert(_pos + 1 <= size());
return _data[_pos++];
}
uint16 FileStream::readUint16() {
assert(_pos + 2 <= size());
uint16 w;
if (_bigEndian)
w = _data[_pos + 1] | (_data[_pos] << 8);
else
w = _data[_pos] | (_data[_pos + 1] << 8);
_pos += 2;
return w;
}
uint32 FileStream::readUint32() {
assert(_pos + 4 <= size());
uint32 w;
if (_bigEndian)
w = _data[_pos + 3] | (_data[_pos + 2] << 8) | (_data[_pos + 1] << 16) | (_data[_pos] << 24);
else
w = _data[_pos] | (_data[_pos + 1] << 8) | (_data[_pos + 2] << 16) | (_data[_pos + 3] << 24);
_pos += 4;
return w;
}
int16 FileStream::readSint16() {
return (int16)readUint16();
}
int32 FileStream::readSint32() {
return (int32)readUint32();
}
// SeekableReadStream functions
int32 FileStream::pos() const {
return _pos;
}
int32 FileStream::size() const {
return _size;
}
bool FileStream::seek(int32 offset, int whence) {
assert(whence == SEEK_SET);
_pos = offset;
return true;
}
} // End of namespace StarTrek
|
