Mercurial > SDL_sound_CoreAudio
annotate playsound/physfsrwops.c @ 312:498240aa76f1
Seek implementations.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Wed, 24 Apr 2002 20:47:21 +0000 |
| parents | d8c0315deba9 |
| children | 35dfa9d9782e |
| rev | line source |
|---|---|
| 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 { | |
|
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37 PHYSFS_sint64 current = PHYSFS_tell(handle); |
| 286 | 38 if (current == -1) |
| 39 { | |
| 40 SDL_SetError("Can't find position in file: %s", | |
| 41 PHYSFS_getLastError()); | |
| 42 return(-1); | |
| 43 } /* if */ | |
| 44 | |
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45 pos = (int) current; |
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46 if ( ((PHYSFS_sint64) pos) != current ) |
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47 { |
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48 SDL_SetError("Can't fit current file position in an int!"); |
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49 return(-1); |
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50 } /* if */ |
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51 |
| 286 | 52 if (offset == 0) /* this is a "tell" call. We're done. */ |
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53 return(pos); |
| 286 | 54 |
|
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55 pos += offset; |
| 286 | 56 } /* else if */ |
| 57 | |
| 58 else if (whence == SEEK_END) | |
| 59 { | |
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60 PHYSFS_sint64 len = PHYSFS_fileLength(handle); |
| 286 | 61 if (len == -1) |
| 62 { | |
| 63 SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError()); | |
| 64 return(-1); | |
| 65 } /* if */ | |
| 66 | |
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67 pos = (int) len; |
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68 if ( ((PHYSFS_sint64) pos) != len ) |
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69 { |
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70 SDL_SetError("Can't fit end-of-file position in an int!"); |
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71 return(-1); |
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72 } /* if */ |
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73 |
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74 pos += offset; |
| 286 | 75 } /* else if */ |
| 76 | |
| 77 else | |
| 78 { | |
| 79 SDL_SetError("Invalid 'whence' parameter."); | |
| 80 return(-1); | |
| 81 } /* else */ | |
| 82 | |
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83 if ( pos < 0 ) |
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84 { |
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85 SDL_SetError("Attempt to seek past start of file."); |
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86 return(-1); |
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87 } /* if */ |
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88 |
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d8c0315deba9
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286
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89 if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos)) |
| 286 | 90 { |
| 91 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 92 return(-1); | |
| 93 } /* if */ | |
| 94 | |
| 95 return(pos); | |
| 96 } /* physfsrwops_seek */ | |
| 97 | |
| 98 | |
| 99 static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum) | |
| 100 { | |
| 101 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
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102 PHYSFS_sint64 rc = PHYSFS_read(handle, ptr, size, maxnum); |
| 286 | 103 if (rc != maxnum) |
| 104 { | |
| 105 if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */ | |
| 106 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 107 } /* if */ | |
| 108 | |
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109 return((int) rc); |
| 286 | 110 } /* physfsrwops_read */ |
| 111 | |
| 112 | |
| 113 static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num) | |
| 114 { | |
| 115 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
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116 PHYSFS_sint64 rc = PHYSFS_write(handle, ptr, size, num); |
| 286 | 117 if (rc != num) |
| 118 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 119 | |
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120 return((int) rc); |
| 286 | 121 } /* physfsrwops_write */ |
| 122 | |
| 123 | |
| 124 static int physfsrwops_close(SDL_RWops *rw) | |
| 125 { | |
| 126 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1; | |
| 127 if (!PHYSFS_close(handle)) | |
| 128 { | |
| 129 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 130 return(-1); | |
| 131 } /* if */ | |
| 132 | |
| 133 SDL_FreeRW(rw); | |
| 134 return(0); | |
| 135 } /* physfsrwops_close */ | |
| 136 | |
| 137 | |
| 138 static SDL_RWops *create_rwops(PHYSFS_file *handle) | |
| 139 { | |
| 140 SDL_RWops *retval = NULL; | |
| 141 | |
| 142 if (handle == NULL) | |
| 143 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError()); | |
| 144 else | |
| 145 { | |
| 146 retval = SDL_AllocRW(); | |
| 147 if (retval != NULL) | |
| 148 { | |
| 149 retval->seek = physfsrwops_seek; | |
| 150 retval->read = physfsrwops_read; | |
| 151 retval->write = physfsrwops_write; | |
| 152 retval->close = physfsrwops_close; | |
| 153 retval->hidden.unknown.data1 = handle; | |
| 154 } /* if */ | |
| 155 } /* else */ | |
| 156 | |
| 157 return(retval); | |
| 158 } /* create_rwops */ | |
| 159 | |
| 160 | |
| 161 SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle) | |
| 162 { | |
| 163 SDL_RWops *retval = NULL; | |
| 164 if (handle == NULL) | |
| 165 SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops()."); | |
| 166 else | |
| 167 retval = create_rwops(handle); | |
| 168 | |
| 169 return(retval); | |
| 170 } /* PHYSFSRWOPS_makeRWops */ | |
| 171 | |
| 172 | |
| 173 SDL_RWops *PHYSFSRWOPS_openRead(const char *fname) | |
| 174 { | |
| 175 return(create_rwops(PHYSFS_openRead(fname))); | |
| 176 } /* PHYSFSRWOPS_openRead */ | |
| 177 | |
| 178 | |
| 179 SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname) | |
| 180 { | |
| 181 return(create_rwops(PHYSFS_openWrite(fname))); | |
| 182 } /* PHYSFSRWOPS_openWrite */ | |
| 183 | |
| 184 | |
| 185 SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname) | |
| 186 { | |
| 187 return(create_rwops(PHYSFS_openAppend(fname))); | |
| 188 } /* PHYSFSRWOPS_openAppend */ | |
| 189 | |
| 190 | |
| 191 /* end of physfsrwops.c ... */ | |
| 192 |