src/liboggplay/oggplay_file_reader.c

   1 /*
   2    Copyright (C) 2003 Commonwealth Scientific and Industrial Research
   3    Organisation (CSIRO) Australia
   4
   5    Redistribution and use in source and binary forms, with or without
   6    modification, are permitted provided that the following conditions
   7    are met:
   8
   9    - Redistributions of source code must retain the above copyright
  10    notice, this list of conditions and the following disclaimer.
  11
  12    - Redistributions in binary form must reproduce the above copyright
  13    notice, this list of conditions and the following disclaimer in the
  14    documentation and/or other materials provided with the distribution.
  15
  16    - Neither the name of CSIRO Australia nor the names of its
  17    contributors may be used to endorse or promote products derived from
  18    this software without specific prior written permission.
  19
  20    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23    PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ORGANISATION OR
  24    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  25    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  26    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  27    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  28    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  29    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  30    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31 */
  32
  33 /*
  34  * oggplay_file_reader.c
  35  *
  36  * Shane Stephens <shane.stephens@annodex.net>
  37  * Michael Martin
  38  */
  39
  40 #include "oggplay_private.h"
  41 #include "oggplay_file_reader.h"
  42
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 OggPlayErrorCode
  47 oggplay_file_reader_initialise(OggPlayReader * opr, int block) {
  48
  49   OggPlayFileReader * me = (OggPlayFileReader *)opr;
  50   (void)block; /* unused for file readers */
  51
  52   if (me == NULL) {
  53     return E_OGGPLAY_BAD_READER;
  54   }
  55
  56   me->file = fopen(me->file_name, "rb");
  57
  58   if (me->file == NULL) {
  59     return E_OGGPLAY_BAD_INPUT;
  60   }
  61
  62   fseek(me->file, 0L, SEEK_END);
  63   me->size = ftell(me->file);
  64   fseek(me->file, 0L, SEEK_SET);
  65
  66   me->current_position = 0;
  67
  68   return E_OGGPLAY_OK;
  69 }
  70
  71 OggPlayErrorCode
  72 oggplay_file_reader_destroy(OggPlayReader * opr) {
  73
  74   OggPlayFileReader * me;
  75
  76   if (opr == NULL) {
  77     return E_OGGPLAY_BAD_READER;
  78   }
  79
  80   me = (OggPlayFileReader *)opr;
  81
  82   if (me->file != NULL) {
  83     fclose(me->file);
  84   }
  85
  86   oggplay_free(me);
  87
  88   return E_OGGPLAY_OK;
  89 }
  90
  91 int
  92 oggplay_file_reader_available(OggPlayReader * opr, ogg_int64_t current_bytes,
  93                               ogg_int64_t current_time) {
  94
  95   OggPlayFileReader *me = (OggPlayFileReader *)opr;
  96
  97   if (me == NULL) {
  98     return -1;
  99   }
 100
 101   return me->size;
 102
 103 }
 104
 105 int
 106 oggplay_file_reader_finished_retrieving(OggPlayReader *opr) {
 107
 108   return 1;
 109
 110 }
 111
 112
 113 static size_t
 114 oggplay_file_reader_io_read(void * user_handle, void * buf, size_t n) {
 115
 116   OggPlayFileReader *me = (OggPlayFileReader *)user_handle;
 117   int r;
 118
 119   if (me == NULL) {
 120     return -1;
 121   }
 122
 123   r = fread(buf, 1, n, me->file);
 124   if (r > 0) {
 125     me->current_position += r;
 126   }
 127
 128   return r;
 129 }
 130
 131 static int
 132 oggplay_file_reader_io_seek(void * user_handle, long offset, int whence) {
 133
 134   OggPlayFileReader * me = (OggPlayFileReader *)user_handle;
 135   int                 r;
 136
 137   if (me == NULL) {
 138     return -1;
 139   }
 140
 141   r = fseek(me->file, offset, whence);
 142   me->current_position = ftell(me->file);
 143   return r;
 144
 145 }
 146
 147 static long
 148 oggplay_file_reader_io_tell(void * user_handle) {
 149
 150   OggPlayFileReader * me = (OggPlayFileReader *)user_handle;
 151
 152   if (me == NULL) {
 153     return -1;
 154   }
 155
 156   return ftell(me->file);
 157
 158 }
 159
 160 OggPlayReader *
 161 oggplay_file_reader_new(const char *file_name) {
 162
 163   OggPlayFileReader * me = oggplay_malloc (sizeof (OggPlayFileReader));
 164
 165   if (me == NULL)
 166     return NULL;
 167
 168   me->current_position = 0;
 169   me->file_name = file_name;
 170   me->file = NULL;
 171
 172   me->functions.initialise = &oggplay_file_reader_initialise;
 173   me->functions.destroy = &oggplay_file_reader_destroy;
 174   me->functions.available = &oggplay_file_reader_available;
 175   me->functions.finished_retrieving = &oggplay_file_reader_finished_retrieving;
 176   me->functions.seek = NULL;
 177   me->functions.duration = NULL;
 178   me->functions.io_read = &oggplay_file_reader_io_read;
 179   me->functions.io_seek = &oggplay_file_reader_io_seek;
 180   me->functions.io_tell = &oggplay_file_reader_io_tell;
 181   me->functions.duration = NULL;
 182
 183   return (OggPlayReader *)me;
 184
 185 }