File: Flex.cc

package info (click to toggle)
exult 0.98rc1-2
  • links: PTS
  • area: contrib
  • in suites: woody
  • size: 6,924 kB
  • ctags: 8,928
  • sloc: cpp: 83,768; sh: 7,643; ansic: 4,328; makefile: 890; yacc: 618; lex: 255; xml: 19
file content (227 lines) | stat: -rw-r--r-- 4,646 bytes parent folder | download
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
226
227
/*
Copyright (C) 2000  Dancer A.L Vesperman

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.
*/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#ifndef PENTAGRAM // DONT'T INCLUDE THIS IN PENTAGRAM!

#if (__GNUG__ >= 2) && (!defined WIN32)
#  pragma implementation
#endif

#define	DEBUGFLEX 0

#include "Flex.h"

#ifndef ALPHA_LINUX_CXX
#  include <cstdio>
#endif
#include <fstream>
#include <iostream>
#include "exceptions.h"
#include "utils.h"

using std::cerr;
using std::endl;
using std::FILE;
using std::memset;
using std::size_t;
using std::string;
using std::strncpy;
using std::ofstream;
using std::ios;


Flex::Flex(const string &n) : U7file(n)
{
	IndexFlexFile();
}

void	Flex::IndexFlexFile(void)
{
	FILE	*fp;
	fp=U7open(filename.c_str(),"rb");
	std::fread(title,sizeof(title),1,fp);
	magic1 = Read4(fp);
	count = Read4(fp);
	magic2 = Read4(fp);
	if(magic1!=0xffff1a00UL)
		throw wrong_file_type_exception(filename,"FLEX");	// Not a flex file

	for(int i=0;i<9;i++)
		padding[i] = Read4(fp);
#if DEBUGFLEX
	cout << "Title: " << title << endl;
	cout << "Count: " << count << endl;
#endif

	// We should already be there.
	fseek(fp,128,SEEK_SET);
	for(uint32 c=0;c<count;c++)
	{
		Flex::Reference f;
		f.offset = Read4(fp);
		f.size = Read4(fp);
#if DEBUGFLEX
		cout << "Item " << c << ": " << f.size << " bytes @ " << f.offset << endl;
#endif
		object_list.push_back(f);
	}
	fclose(fp);
}

char *	Flex::retrieve(uint32 objnum, size_t &len)
{
	FILE	*fp;
	char	*buffer;

	if (objnum >= object_list.size())
		throw exult_exception("objnum too large in Flex::retrieve()");

	fp = U7open(filename.c_str(), "rb");
	fseek(fp, object_list[objnum].offset, SEEK_SET);
	len = object_list[objnum].size;
	buffer = new char[len];
	std::fread(buffer, len, 1, fp);
	fclose(fp);
	
	return buffer;
}

/*
 *	Write out a FLEX header.  Note that this is a STATIC method.
 */

void Flex::write_header
	(
	std::ostream& out,			// File to write to.
	const char *title,
	int count			// # entries.
	)
	{
	char titlebuf[0x50];		// Use savename for title.
	memset(titlebuf, 0, sizeof(titlebuf));
	strncpy(titlebuf, title, sizeof(titlebuf) - 1);
	out.write(titlebuf, sizeof(titlebuf));
	Write4(out, 0xFFFF1A00);	// Magic number.
	Write4(out, count);
	Write4(out, 0x000000CC);	// 2nd magic number.
	long pos = out.tellp();		// Fill to data (past table at 0x80).
	long fill = 0x80 + 8*count - pos;
	while (fill--)
		out.put((char) 0);
	}

/*
 *	Verify if a file is a FLEX.  Note that this is a STATIC method.
 */

bool Flex::is_flex(std::istream& in)
{
	long pos = in.tellg();		// Fill to data (past table at 0x80).
	in.seekg(0x50);
	uint32 magic = Read4(in);
	in.seekg(pos);

	// Is a flex
	if(magic==0xffff1a00UL) return true;

	// Isn't a flex
	return false;
}

bool Flex::is_flex(const char *fname)
{
	bool is = false;
	std::ifstream in;
	U7open (in, fname);

	if (in.good()) is = is_flex(in);

	in.close();
	return is;
}

/*
 *	Start writing out a new Flex file.
 */

Flex_writer::Flex_writer
	(
	ofstream& o,			// Where to write.
	const char *title,		// Flex title.
	int cnt				// #entries we'll write.
	) : out(&o), count(cnt), index(0)
	{
					// Write out header.
	Flex::write_header(*out, title, count);
					// Create table.
	tptr = table = new uint8[2*count*4];
	cur_start = out->tellp();	// Store start of 1st entry.
	}

/*
 *	Clean up.
 */

Flex_writer::~Flex_writer
	(
	)
	{
	close();
	}

/*
 *	Call this when done writing out a section.
 */

void Flex_writer::mark_section_done
	(
	)
	{
	long pos = out->tellp();	// Location past end of section.
	Write4(tptr, cur_start);	// Store start of section.
	Write4(tptr, pos - cur_start);	// Store length.
	cur_start = pos;
	}

/*
 *	All done.
 *
 *	Output:	False if error.
 */

bool Flex_writer::close
	(
	)
	{
	if (!table)
		return true;		// Already done.
	out->seekp(0x80, ios::beg);	// Write table.
	out->write(reinterpret_cast<char*>(table), 2*count*4);
	out->flush();
	bool ok = out->good();
	out->close();
	delete table;
	table = 0;
	return ok;
	}

#endif // PENTAGRAM