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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2005 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "common/stdafx.h"
#include "scumm/smush/chunk.h"
#include "scumm/scumm.h"
#include "common/file.h"
#include "common/str.h"
#include "common/util.h"
namespace Scumm {
const char *Chunk::ChunkString(Chunk::type t) {
static char data[5];
data[0] = (char)((t >> 24) & 0xFF);
data[1] = (char)((t >> 16) & 0xFF);
data[2] = (char)((t >> 8) & 0xFF);
data[3] = (char)((t >> 0) & 0xFF);
data[4] = 0;
return data;
}
BaseChunk::BaseChunk() :
_type(0),
_size(0),
_curPos(0) {
}
bool BaseChunk::eof() const {
return _curPos >= _size;
}
uint32 BaseChunk::tell() const {
return _curPos;
}
Chunk::type BaseChunk::getType() const {
return _type;
}
uint32 BaseChunk::getSize() const {
return _size;
}
bool BaseChunk::seek(int32 delta, seek_type dir) {
switch(dir) {
case seek_cur:
_curPos += delta;
break;
case seek_start:
if (delta < 0)
error("invalid seek request");
_curPos = (uint32)delta;
break;
case seek_end:
if (delta > 0 || _size < (uint32)-delta)
error("invalid seek request");
_curPos = (uint32)(_size + delta);
break;
}
if (_curPos > _size) {
error("invalid seek request : %d > %d (delta == %d)", _curPos, _size, delta);
}
return true;
}
FileChunk::FileChunk(const Common::String &name, int offset)
: _name(name) {
if (!g_scumm->openFile(_data, name.c_str()))
error("FileChunk: Unable to open file %s", name.c_str());
_data.seek(offset);
_type = _data.readUint32BE();
_size = _data.readUint32BE();
_offset = _data.pos();
_curPos = 0;
}
FileChunk::~FileChunk() {
}
Chunk *FileChunk::subBlock() {
FileChunk *ptr = new FileChunk(_name, _offset + _curPos);
_data.seek(_offset + _curPos + sizeof(Chunk::type) + sizeof(uint32));
seek(sizeof(Chunk::type) + sizeof(uint32) + ptr->getSize());
return ptr;
}
bool FileChunk::read(void *buffer, uint32 size) {
if (size <= 0 || (_curPos + size) > _size)
error("invalid buffer read request");
// _data.seek(_offset + _curPos);
_data.read(buffer, size);
_curPos += size;
return true;
}
int8 FileChunk::getChar() {
return (int8)getByte();
}
byte FileChunk::getByte() {
// _data.seek(_offset + _curPos);
_curPos++;
if (_curPos > _size)
error("invalid byte read request");
return _data.readByte();
}
int16 FileChunk::getShort() {
return (int16)getWord();
}
uint16 FileChunk::getWord() {
// _data.seek(_offset + _curPos);
_curPos += 2;
if (_curPos > _size)
error("invalid word read request");
return _data.readUint16LE();
}
uint32 FileChunk::getDword() {
// _data.seek(_offset + _curPos);
_curPos += 4;
if (_curPos > _size)
error("invalid dword read request");
return _data.readUint32LE();
}
MemoryChunk::MemoryChunk(byte *data) {
if (data == 0)
error("Chunk() called with NULL pointer");
_type = (Chunk::type)READ_BE_UINT32(data);
_size = READ_BE_UINT32(data + 4);
_data = data + sizeof(Chunk::type) + sizeof(uint32);
_curPos = 0;
}
Chunk *MemoryChunk::subBlock() {
MemoryChunk *ptr = new MemoryChunk(_data + _curPos);
seek(sizeof(Chunk::type) + sizeof(uint32) + ptr->getSize());
return ptr;
}
bool MemoryChunk::read(void *buffer, uint32 size) {
if (size <= 0 || (_curPos + size) > _size)
error("invalid buffer read request");
memcpy(buffer, _data + _curPos, size);
_curPos += size;
return true;
}
int8 MemoryChunk::getChar() {
if (_curPos >= _size)
error("invalid char read request");
return _data[_curPos++];
}
byte MemoryChunk::getByte() {
if (_curPos >= _size)
error("invalid byte read request");
byte *ptr = (byte *)(_data + _curPos);
_curPos += 1;
return *ptr;
}
int16 MemoryChunk::getShort() {
if (_curPos >= _size - 1)
error("invalid int16 read request");
int16 buffer = getWord();
return *((int16 *)&buffer);
}
uint16 MemoryChunk::getWord() {
if (_curPos >= _size - 1)
error("invalid word read request");
uint16 *ptr = (uint16 *)(_data + _curPos);
_curPos += 2;
return READ_LE_UINT16(ptr);
}
uint32 MemoryChunk::getDword() {
if (_curPos >= _size - 3)
error("invalid dword read request");
uint32 *ptr = (uint32 *)(_data + _curPos);
_curPos += 4;
return READ_LE_UINT32(ptr);
}
} // End of namespace Scumm
|
