1// SuperTux
2// Copyright (C) 2006 Matthias Braun <matze@braunis.de>
3//
4// This program is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// This program is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with this program. If not, see <http://www.gnu.org/licenses/>.
16
17#include "physfs/physfs_sdl.hpp"
18
19#include <physfs.h>
20#include <sstream>
21#include <stdexcept>
22#include <assert.h>
23#include <stdio.h>
24
25#include "util/log.hpp"
26
27namespace {
28
29Sint64 funcSize(struct SDL_RWops* context)
30{
31 PHYSFS_file* file = static_cast<PHYSFS_file*>(context->hidden.unknown.data1);
32 return PHYSFS_fileLength(file);
33}
34
35Sint64 funcSeek(struct SDL_RWops* context, Sint64 offset, int whence)
36{
37 PHYSFS_file* file = static_cast<PHYSFS_file*>(context->hidden.unknown.data1);
38 int res;
39 switch (whence) {
40 case SEEK_SET:
41 res = PHYSFS_seek(file, offset);
42 break;
43 case SEEK_CUR:
44 res = PHYSFS_seek(file, PHYSFS_tell(file) + offset);
45 break;
46 case SEEK_END:
47 res = PHYSFS_seek(file, PHYSFS_fileLength(file) + offset);
48 break;
49 default:
50 res = 0; // NOLINT
51 assert(false);
52 break;
53 }
54 if (res == 0) {
55 log_warning << "Error seeking in file: " << PHYSFS_getLastErrorCode() << std::endl;
56 return -1;
57 }
58
59 return static_cast<int>(PHYSFS_tell(file));
60}
61
62size_t funcRead(struct SDL_RWops* context, void* ptr, size_t size, size_t maxnum)
63{
64 PHYSFS_file* file = static_cast<PHYSFS_file*>(context->hidden.unknown.data1);
65
66 PHYSFS_sint64 res = PHYSFS_readBytes(file, ptr, size * maxnum);
67 if (res < 0)
68 {
69 return 0;
70 }
71 else
72 {
73 return static_cast<size_t>(res / size);
74 }
75}
76
77size_t funcWrite(struct SDL_RWops* context, const void* ptr, size_t size, size_t num)
78{
79 PHYSFS_file* file = static_cast<PHYSFS_file*>(context->hidden.unknown.data1);
80
81 PHYSFS_sint64 res = PHYSFS_writeBytes(file, ptr, size * num);
82 if (res < 0)
83 {
84 return 0;
85 }
86 else
87 {
88 return static_cast<size_t>(res / size);
89 }
90}
91
92int funcClose(struct SDL_RWops* context)
93{
94 PHYSFS_file* file = static_cast<PHYSFS_file*>(context->hidden.unknown.data1);
95
96 PHYSFS_close(file);
97 delete context;
98
99 return 0;
100}
101
102} // namespace
103
104SDL_RWops* get_physfs_SDLRWops(const std::string& filename)
105{
106 // check this as PHYSFS seems to be buggy and still returns a
107 // valid pointer in this case
108 if (filename.empty()) {
109 throw std::runtime_error("Couldn't open file: empty filename");
110 }
111
112 PHYSFS_file* file = static_cast<PHYSFS_file*>(PHYSFS_openRead(filename.c_str()));
113 if (!file) {
114 std::stringstream msg;
115 msg << "Couldn't open '" << filename << "': "
116 << PHYSFS_getLastErrorCode();
117 throw std::runtime_error(msg.str());
118 }
119
120 SDL_RWops* ops = new SDL_RWops;
121 ops->size = funcSize;
122 ops->seek = funcSeek;
123 ops->read = funcRead;
124 ops->write = funcWrite;
125 ops->close = funcClose;
126 ops->type = SDL_RWOPS_UNKNOWN;
127 ops->hidden.unknown.data1 = file;
128
129 return ops;
130}
131
132SDL_RWops* get_writable_physfs_SDLRWops(const std::string& filename)
133{
134 // check this as PHYSFS seems to be buggy and still returns a
135 // valid pointer in this case
136 if (filename.empty()) {
137 throw std::runtime_error("Couldn't open file: empty filename");
138 }
139
140 PHYSFS_file* file = static_cast<PHYSFS_file*>(PHYSFS_openWrite(filename.c_str()));
141 if (!file) {
142 std::stringstream msg;
143 msg << "Couldn't open '" << filename << "' for writing: "
144 << PHYSFS_getLastErrorCode();
145 throw std::runtime_error(msg.str());
146 }
147
148 SDL_RWops* ops = new SDL_RWops;
149 ops->size = funcSize;
150 ops->seek = funcSeek;
151 ops->read = funcRead;
152 ops->write = funcWrite;
153 ops->close = funcClose;
154 ops->type = SDL_RWOPS_UNKNOWN;
155 ops->hidden.unknown.data1 = file;
156
157 return ops;
158}
159
160/* EOF */
161