aboutsummaryrefslogtreecommitdiff
path: root/common/savefile.cpp
blob: 3aba3fdc36374ea2ae11670bdd74a3e54cbeb8ad (plain)
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
/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2004 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 "stdafx.h"
#include "common/util.h"
#include "common/savefile.h"

#include <stdio.h>
#include <string.h>

#ifdef USE_ZLIB
#include <zlib.h>
#endif

uint32 SaveFile::read(void *ptr, uint32 size) {
	return fread(ptr, 1, size);
}

uint32 SaveFile::write(const void *ptr, uint32 size) {
	return fwrite(ptr, 1, size);
}


class StdioSaveFile : public SaveFile {
private:
	FILE *fh;
public:
	StdioSaveFile(const char *filename, bool saveOrLoad)
		{ fh = ::fopen(filename, (saveOrLoad? "wb" : "rb")); }
	~StdioSaveFile()
		{ if(fh) ::fclose(fh); }

	bool isOpen() const { return fh != 0; }

protected:
	int fread(void *buf, int size, int cnt)
		{ return ::fread(buf, size, cnt, fh); }
	int fwrite(const void *buf, int size, int cnt)
		{ return ::fwrite(buf, size, cnt, fh); }
};


#ifdef USE_ZLIB
class GzipSaveFile : public SaveFile {
private:
	gzFile fh;
public:
	GzipSaveFile(const char *filename, bool saveOrLoad)
		{ fh = ::gzopen(filename, (saveOrLoad? "wb" : "rb")); }
	~GzipSaveFile()
		{ if(fh) ::gzclose(fh); }

	bool isOpen() const { return fh != 0; }

protected:
	int fread(void *buf, int size, int cnt) {
		return ::gzread(fh, buf, size * cnt);
	}
	int fwrite(const void *buf, int size, int cnt) {
		// Due to a "bug" in the zlib headers (or maybe I should say,
		// a bug in the C++ spec? Whatever <g>) we have to be a bit
		// hackish here and remove the const qualifier.
		// Note that gzwrite's buf param is declared as "const voidp"
		// which you might think is the same as "const void *" but it
		// is not - rather it is equal to "void const *" which is the 
		// same as "void *". Hrmpf
		return ::gzwrite(fh, const_cast<void *>(buf), size * cnt);
	}
};
#endif


SaveFile *SaveFileManager::open_savefile(const char *filename, const char *directory, bool saveOrLoad) {
	char buf[256];
	join_paths(filename, directory, buf, sizeof(buf));
	SaveFile *sf = makeSaveFile(buf, saveOrLoad);
	if (!sf->isOpen()) {
		delete sf;
		sf = 0;
	}
	return sf;
}

void SaveFileManager::join_paths(const char *filename, const char *directory,
								 char *buf, int bufsize) {
	buf[bufsize-1] = '\0';
	strncpy(buf, directory, bufsize-1);

#ifdef WIN32
	// Fix for Win98 issue related with game directory pointing to root drive ex. "c:\"
	if ((buf[0] != 0) && (buf[1] == ':') && (buf[2] == '\\') && (buf[3] == 0)) {
		buf[2] = 0;
	}
#endif

	const int dirLen = strlen(buf);

	if (dirLen > 0) {
#ifdef __MORPHOS__
		if (buf[dirLen-1] != ':' && buf[dirLen-1] != '/')
#endif

#if !defined(__GP32__) && !defined(__PALM_OS__)
		strncat(buf, "/", bufsize-1);	// prevent double /
#endif
	}
	strncat(buf, filename, bufsize-1);
}

SaveFile *SaveFileManager::makeSaveFile(const char *filename, bool saveOrLoad) {
#ifdef USE_ZLIB
	return new GzipSaveFile(filename, saveOrLoad);
#else
	return new StdioSaveFile(filename, saveOrLoad);
#endif
}