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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/*
* This code provides a glue layer between PhysicsFS and Simple Directmedia
* Layer's (SDL) RWops i/o abstraction.
*
* License: this code is public domain. I make no warranty that it is useful,
* correct, harmless, or environmentally safe.
*
* This particular file may be used however you like, including copying it
* verbatim into a closed-source project, exploiting it commercially, and
* removing any trace of my name from the source (although I hope you won't
* do that). I welcome enhancements and corrections to this file, but I do
* not require you to send me patches if you make changes. This code has
* NO WARRANTY.
*
* Unless otherwise stated, the rest of PhysicsFS falls under the zlib license.
* Please see LICENSE.txt in the root of the source tree.
*
* SDL 1.2 falls under the LGPL license. SDL 1.3+ is zlib, like PhysicsFS.
* You can get SDL at https://www.libsdl.org/
*
* This file was written by Ryan C. Gordon. (icculus@icculus.org).
*/
#include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
#include "physfsrwops.h"
/* SDL's RWOPS interface changed a little in SDL 2.0... */
#if defined(SDL_VERSION_ATLEAST)
#if SDL_VERSION_ATLEAST(2, 0, 0)
#define TARGET_SDL2 1
#endif
#endif
#if !TARGET_SDL2
#ifndef RW_SEEK_SET
#define RW_SEEK_SET SEEK_SET
#endif
#ifndef RW_SEEK_CUR
#define RW_SEEK_CUR SEEK_CUR
#endif
#ifndef RW_SEEK_END
#define RW_SEEK_END SEEK_END
#endif
#endif
#if TARGET_SDL2
static Sint64 SDLCALL physfsrwops_size(struct SDL_RWops *rw)
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
return (Sint64) PHYSFS_fileLength(handle);
} /* physfsrwops_size */
#endif
#if TARGET_SDL2
static Sint64 SDLCALL physfsrwops_seek(struct SDL_RWops *rw, Sint64 offset, int whence)
#else
static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
#endif
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
PHYSFS_sint64 pos = 0;
if (whence == RW_SEEK_SET)
pos = (PHYSFS_sint64) offset;
else if (whence == RW_SEEK_CUR)
{
const PHYSFS_sint64 current = PHYSFS_tell(handle);
if (current == -1)
{
SDL_SetError("Can't find position in file: %s",
PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
return -1;
} /* if */
if (offset == 0) /* this is a "tell" call. We're done. */
{
#if TARGET_SDL2
return (Sint64) current;
#else
return (int) current;
#endif
} /* if */
pos = current + ((PHYSFS_sint64) offset);
} /* else if */
else if (whence == RW_SEEK_END)
{
const PHYSFS_sint64 len = PHYSFS_fileLength(handle);
if (len == -1)
{
SDL_SetError("Can't find end of file: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
return -1;
} /* if */
pos = len + ((PHYSFS_sint64) offset);
} /* else if */
else
{
SDL_SetError("Invalid 'whence' parameter.");
return -1;
} /* else */
if ( pos < 0 )
{
SDL_SetError("Attempt to seek past start of file.");
return -1;
} /* if */
if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos))
{
SDL_SetError("PhysicsFS error: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
return -1;
} /* if */
#if TARGET_SDL2
return (Sint64) pos;
#else
return (int) pos;
#endif
} /* physfsrwops_seek */
#if TARGET_SDL2
static size_t SDLCALL physfsrwops_read(struct SDL_RWops *rw, void *ptr,
size_t size, size_t maxnum)
#else
static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
#endif
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
const PHYSFS_uint64 readlen = (PHYSFS_uint64) (maxnum * size);
const PHYSFS_sint64 rc = PHYSFS_readBytes(handle, ptr, readlen);
if (rc != ((PHYSFS_sint64) readlen))
{
if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
{
SDL_SetError("PhysicsFS error: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
#if TARGET_SDL2
return 0;
#else
return -1;
#endif
} /* if */
} /* if */
#if TARGET_SDL2
return (size_t) rc / size;
#else
return (int) rc / size;
#endif
} /* physfsrwops_read */
#if TARGET_SDL2
static size_t SDLCALL physfsrwops_write(struct SDL_RWops *rw, const void *ptr,
size_t size, size_t num)
#else
static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
#endif
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
const PHYSFS_uint64 writelen = (PHYSFS_uint64) (num * size);
const PHYSFS_sint64 rc = PHYSFS_writeBytes(handle, ptr, writelen);
if (rc != ((PHYSFS_sint64) writelen))
SDL_SetError("PhysicsFS error: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
#if TARGET_SDL2
return (size_t) rc;
#else
return (int) rc;
#endif
} /* physfsrwops_write */
static int physfsrwops_close(SDL_RWops *rw)
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
if (!PHYSFS_close(handle))
{
SDL_SetError("PhysicsFS error: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
return -1;
} /* if */
SDL_FreeRW(rw);
return 0;
} /* physfsrwops_close */
static SDL_RWops *create_rwops(PHYSFS_File *handle)
{
SDL_RWops *retval = NULL;
if (handle == NULL)
SDL_SetError("PhysicsFS error: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
else
{
retval = SDL_AllocRW();
if (retval != NULL)
{
#if TARGET_SDL2
retval->size = physfsrwops_size;
#endif
retval->seek = physfsrwops_seek;
retval->read = physfsrwops_read;
retval->write = physfsrwops_write;
retval->close = physfsrwops_close;
retval->hidden.unknown.data1 = handle;
} /* if */
} /* else */
return retval;
} /* create_rwops */
SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_File *handle)
{
SDL_RWops *retval = NULL;
if (handle == NULL)
SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
else
retval = create_rwops(handle);
return retval;
} /* PHYSFSRWOPS_makeRWops */
SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
{
return create_rwops(PHYSFS_openRead(fname));
} /* PHYSFSRWOPS_openRead */
SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
{
return create_rwops(PHYSFS_openWrite(fname));
} /* PHYSFSRWOPS_openWrite */
SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
{
return create_rwops(PHYSFS_openAppend(fname));
} /* PHYSFSRWOPS_openAppend */
/* end of physfsrwops.c ... */
|
