Mercurial > SDL_sound_CoreAudio
annotate playsound/physfsrwops.c @ 533:cad2940e992f stable-1.0
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 17 Apr 2008 17:55:22 +0000 |
| parents | 50bb9a6cebfe |
| children |
| rev | line source |
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| 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 * | |
|
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19 * This file was written by Ryan C. Gordon. (icculus@icculus.org). |
| 286 | 20 */ |
| 21 | |
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22 #if SUPPORT_PHYSFS |
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23 |
| 286 | 24 #include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */ |
| 25 #include "physfsrwops.h" | |
| 26 | |
| 27 static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence) | |
| 28 { | |
| 29 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
| 30 int pos = 0; | |
| 31 | |
| 32 if (whence == SEEK_SET) | |
| 33 { | |
| 34 pos = offset; | |
| 35 } /* if */ | |
| 36 | |
| 37 else if (whence == SEEK_CUR) | |
| 38 { | |
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39 PHYSFS_sint64 current = PHYSFS_tell(handle); |
| 286 | 40 if (current == -1) |
| 41 { | |
| 42 SDL_SetError("Can't find position in file: %s", | |
| 43 PHYSFS_getLastError()); | |
| 44 return(-1); | |
| 45 } /* if */ | |
| 46 | |
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47 pos = (int) current; |
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48 if ( ((PHYSFS_sint64) pos) != current ) |
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49 { |
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50 SDL_SetError("Can't fit current file position in an int!"); |
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51 return(-1); |
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52 } /* if */ |
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53 |
| 286 | 54 if (offset == 0) /* this is a "tell" call. We're done. */ |
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55 return(pos); |
| 286 | 56 |
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57 pos += offset; |
| 286 | 58 } /* else if */ |
| 59 | |
| 60 else if (whence == SEEK_END) | |
| 61 { | |
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62 PHYSFS_sint64 len = PHYSFS_fileLength(handle); |
| 286 | 63 if (len == -1) |
| 64 { | |
| 65 SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError()); | |
| 66 return(-1); | |
| 67 } /* if */ | |
| 68 | |
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69 pos = (int) len; |
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70 if ( ((PHYSFS_sint64) pos) != len ) |
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71 { |
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72 SDL_SetError("Can't fit end-of-file position in an int!"); |
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73 return(-1); |
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74 } /* if */ |
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75 |
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76 pos += offset; |
| 286 | 77 } /* else if */ |
| 78 | |
| 79 else | |
| 80 { | |
| 81 SDL_SetError("Invalid 'whence' parameter."); | |
| 82 return(-1); | |
| 83 } /* else */ | |
| 84 | |
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85 if ( pos < 0 ) |
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86 { |
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87 SDL_SetError("Attempt to seek past start of file."); |
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88 return(-1); |
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89 } /* if */ |
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90 |
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91 if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos)) |
| 286 | 92 { |
| 93 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 94 return(-1); | |
| 95 } /* if */ | |
| 96 | |
| 97 return(pos); | |
| 98 } /* physfsrwops_seek */ | |
| 99 | |
| 100 | |
| 101 static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum) | |
| 102 { | |
| 103 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
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104 PHYSFS_sint64 rc = PHYSFS_read(handle, ptr, size, maxnum); |
| 286 | 105 if (rc != maxnum) |
| 106 { | |
| 107 if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */ | |
| 108 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 109 } /* if */ | |
| 110 | |
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111 return((int) rc); |
| 286 | 112 } /* physfsrwops_read */ |
| 113 | |
| 114 | |
| 115 static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num) | |
| 116 { | |
| 117 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
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118 PHYSFS_sint64 rc = PHYSFS_write(handle, ptr, size, num); |
| 286 | 119 if (rc != num) |
| 120 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 121 | |
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122 return((int) rc); |
| 286 | 123 } /* physfsrwops_write */ |
| 124 | |
| 125 | |
| 126 static int physfsrwops_close(SDL_RWops *rw) | |
| 127 { | |
| 128 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
| 129 if (!PHYSFS_close(handle)) | |
| 130 { | |
| 131 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 132 return(-1); | |
| 133 } /* if */ | |
| 134 | |
| 135 SDL_FreeRW(rw); | |
| 136 return(0); | |
| 137 } /* physfsrwops_close */ | |
| 138 | |
| 139 | |
| 140 static SDL_RWops *create_rwops(PHYSFS_file *handle) | |
| 141 { | |
| 142 SDL_RWops *retval = NULL; | |
| 143 | |
| 144 if (handle == NULL) | |
| 145 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 146 else | |
| 147 { | |
| 148 retval = SDL_AllocRW(); | |
| 149 if (retval != NULL) | |
| 150 { | |
| 151 retval->seek = physfsrwops_seek; | |
| 152 retval->read = physfsrwops_read; | |
| 153 retval->write = physfsrwops_write; | |
| 154 retval->close = physfsrwops_close; | |
| 155 retval->hidden.unknown.data1 = handle; | |
| 156 } /* if */ | |
| 157 } /* else */ | |
| 158 | |
| 159 return(retval); | |
| 160 } /* create_rwops */ | |
| 161 | |
| 162 | |
| 163 SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle) | |
| 164 { | |
| 165 SDL_RWops *retval = NULL; | |
| 166 if (handle == NULL) | |
| 167 SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops()."); | |
| 168 else | |
| 169 retval = create_rwops(handle); | |
| 170 | |
| 171 return(retval); | |
| 172 } /* PHYSFSRWOPS_makeRWops */ | |
| 173 | |
| 174 | |
| 175 SDL_RWops *PHYSFSRWOPS_openRead(const char *fname) | |
| 176 { | |
| 177 return(create_rwops(PHYSFS_openRead(fname))); | |
| 178 } /* PHYSFSRWOPS_openRead */ | |
| 179 | |
| 180 | |
| 181 SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname) | |
| 182 { | |
| 183 return(create_rwops(PHYSFS_openWrite(fname))); | |
| 184 } /* PHYSFSRWOPS_openWrite */ | |
| 185 | |
| 186 | |
| 187 SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname) | |
| 188 { | |
| 189 return(create_rwops(PHYSFS_openAppend(fname))); | |
| 190 } /* PHYSFSRWOPS_openAppend */ | |
| 191 | |
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192 #endif |
| 286 | 193 |
| 194 /* end of physfsrwops.c ... */ | |
| 195 |