src/add-ons/media/plugins/asf_reader/libasf/byteio.c

   1 /*  libasf - An Advanced Systems Format media file parser
   2  *  Copyright (C) 2006-2010 Juho Vähä-Herttua
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Lesser General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2.1 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  *  Lesser General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Lesser General Public
  15  *  License along with this library; if not, write to the Free Software
  16  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <string.h>
  20
  21 #include "asfint.h"
  22 #include "byteio.h"
  23
  24 int
  25 asf_byteio_read(asf_iostream_t *iostream, uint8_t *data, int size)
  26 {
  27         int read = 0, tmp;
  28
  29         if (!iostream->read) {
  30                 return ASF_ERROR_INTERNAL;
  31         }
  32
  33         while ((tmp = iostream->read(iostream->opaque, data+read, size-read)) > 0) {
  34                 read += tmp;
  35                 if (read == size) {
  36                         return read;
  37                 }
  38         }
  39
  40         /* FIXME: should return tmp if any bytes were read, but the
  41                   rest of the code needs to be fixed before that */
  42
  43         return (tmp == 0) ? ASF_ERROR_EOF : ASF_ERROR_IO;
  44 }
  45