|
286
|
1 /*
|
|
|
2 * This code provides a glue layer between PhysicsFS and Simple Directmedia
|
|
|
3 * Layer's (SDL) RWops i/o abstraction.
|
|
|
4 *
|
|
|
5 * License: this code is public domain. I make no warranty that it is useful,
|
|
|
6 * correct, harmless, or environmentally safe.
|
|
|
7 *
|
|
|
8 * This particular file may be used however you like, including copying it
|
|
|
9 * verbatim into a closed-source project, exploiting it commercially, and
|
|
|
10 * removing any trace of my name from the source (although I hope you won't
|
|
|
11 * do that). I welcome enhancements and corrections to this file, but I do
|
|
|
12 * not require you to send me patches if you make changes.
|
|
|
13 *
|
|
|
14 * Unless otherwise stated, the rest of PhysicsFS falls under the GNU Lesser
|
|
|
15 * General Public License: http://www.gnu.org/licenses/lgpl.txt
|
|
|
16 *
|
|
|
17 * SDL falls under the LGPL, too. You can get SDL at http://www.libsdl.org/
|
|
|
18 *
|
|
|
19 * This file was written by Ryan C. Gordon. (icculus@clutteredmind.org).
|
|
|
20 */
|
|
|
21
|
|
|
22 #include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
|
|
|
23 #include "physfsrwops.h"
|
|
|
24
|
|
|
25 static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
|
|
|
26 {
|
|
|
27 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
|
|
|
28 int pos = 0;
|
|
|
29
|
|
|
30 if (whence == SEEK_SET)
|
|
|
31 {
|
|
|
32 pos = offset;
|
|
|
33 } /* if */
|
|
|
34
|
|
|
35 else if (whence == SEEK_CUR)
|
|
|
36 {
|
|
|
37 int current = PHYSFS_tell(handle);
|
|
|
38 if (current == -1)
|
|
|
39 {
|
|
|
40 SDL_SetError("Can't find position in file: %s",
|
|
|
41 PHYSFS_getLastError());
|
|
|
42 return(-1);
|
|
|
43 } /* if */
|
|
|
44
|
|
|
45 if (offset == 0) /* this is a "tell" call. We're done. */
|
|
|
46 return(offset);
|
|
|
47
|
|
|
48 pos = current + offset;
|
|
|
49 } /* else if */
|
|
|
50
|
|
|
51 else if (whence == SEEK_END)
|
|
|
52 {
|
|
|
53 int len = PHYSFS_fileLength(handle);
|
|
|
54 if (len == -1)
|
|
|
55 {
|
|
|
56 SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
|
|
|
57 return(-1);
|
|
|
58 } /* if */
|
|
|
59
|
|
|
60 pos = len + offset;
|
|
|
61 } /* else if */
|
|
|
62
|
|
|
63 else
|
|
|
64 {
|
|
|
65 SDL_SetError("Invalid 'whence' parameter.");
|
|
|
66 return(-1);
|
|
|
67 } /* else */
|
|
|
68
|
|
|
69 if (!PHYSFS_seek(handle, pos))
|
|
|
70 {
|
|
|
71 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
|
|
|
72 return(-1);
|
|
|
73 } /* if */
|
|
|
74
|
|
|
75 return(pos);
|
|
|
76 } /* physfsrwops_seek */
|
|
|
77
|
|
|
78
|
|
|
79 static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
|
|
|
80 {
|
|
|
81 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
|
|
|
82 int rc = PHYSFS_read(handle, ptr, size, maxnum);
|
|
|
83 if (rc != maxnum)
|
|
|
84 {
|
|
|
85 if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
|
|
|
86 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
|
|
|
87 } /* if */
|
|
|
88
|
|
|
89 return(rc);
|
|
|
90 } /* physfsrwops_read */
|
|
|
91
|
|
|
92
|
|
|
93 static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
|
|
|
94 {
|
|
|
95 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
|
|
|
96 int rc = PHYSFS_write(handle, ptr, size, num);
|
|
|
97 if (rc != num)
|
|
|
98 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
|
|
|
99
|
|
|
100 return(rc);
|
|
|
101 } /* physfsrwops_write */
|
|
|
102
|
|
|
103
|
|
|
104 static int physfsrwops_close(SDL_RWops *rw)
|
|
|
105 {
|
|
|
106 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
|
|
|
107 if (!PHYSFS_close(handle))
|
|
|
108 {
|
|
|
109 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
|
|
|
110 return(-1);
|
|
|
111 } /* if */
|
|
|
112
|
|
|
113 SDL_FreeRW(rw);
|
|
|
114 return(0);
|
|
|
115 } /* physfsrwops_close */
|
|
|
116
|
|
|
117
|
|
|
118 static SDL_RWops *create_rwops(PHYSFS_file *handle)
|
|
|
119 {
|
|
|
120 SDL_RWops *retval = NULL;
|
|
|
121
|
|
|
122 if (handle == NULL)
|
|
|
123 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
|
|
|
124 else
|
|
|
125 {
|
|
|
126 retval = SDL_AllocRW();
|
|
|
127 if (retval != NULL)
|
|
|
128 {
|
|
|
129 retval->seek = physfsrwops_seek;
|
|
|
130 retval->read = physfsrwops_read;
|
|
|
131 retval->write = physfsrwops_write;
|
|
|
132 retval->close = physfsrwops_close;
|
|
|
133 retval->hidden.unknown.data1 = handle;
|
|
|
134 } /* if */
|
|
|
135 } /* else */
|
|
|
136
|
|
|
137 return(retval);
|
|
|
138 } /* create_rwops */
|
|
|
139
|
|
|
140
|
|
|
141 SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle)
|
|
|
142 {
|
|
|
143 SDL_RWops *retval = NULL;
|
|
|
144 if (handle == NULL)
|
|
|
145 SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
|
|
|
146 else
|
|
|
147 retval = create_rwops(handle);
|
|
|
148
|
|
|
149 return(retval);
|
|
|
150 } /* PHYSFSRWOPS_makeRWops */
|
|
|
151
|
|
|
152
|
|
|
153 SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
|
|
|
154 {
|
|
|
155 return(create_rwops(PHYSFS_openRead(fname)));
|
|
|
156 } /* PHYSFSRWOPS_openRead */
|
|
|
157
|
|
|
158
|
|
|
159 SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
|
|
|
160 {
|
|
|
161 return(create_rwops(PHYSFS_openWrite(fname)));
|
|
|
162 } /* PHYSFSRWOPS_openWrite */
|
|
|
163
|
|
|
164
|
|
|
165 SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
|
|
|
166 {
|
|
|
167 return(create_rwops(PHYSFS_openAppend(fname)));
|
|
|
168 } /* PHYSFSRWOPS_openAppend */
|
|
|
169
|
|
|
170
|
|
|
171 /* end of physfsrwops.c ... */
|
|
|
172
|
