workbench/libs/iffparse/dosstreamhandler.c

   1 /*
   2     Copyright © 1995-2004, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     DOS stream handler. Used in InitIFFasDOS.
   6 */
   7
   8 #define DEBUG 0
   9 #include <aros/debug.h>
  10 #include "iffparse_intern.h"
  11
  12 /********************/
  13 /* DosStreamHandler */
  14 /********************/
  15
  16 #define IFFParseBase IPB(hook->h_Data)
  17
  18 ULONG DOSStreamHandler
  19 (
  20     struct Hook         * hook,
  21     struct IFFHandle    * iff,
  22     struct IFFStreamCmd * cmd
  23 )
  24 {
  25     LONG error = 0;
  26
  27     DEBUG_DOSSTREAMHANDLER(dprintf("DOSStreamHandler: hook %p iff %p cmd %p\n", hook, iff, cmd));
  28
  29     switch (cmd->sc_Command)
  30     {
  31     case IFFCMD_READ:
  32         DEBUG_BUFSTREAMHANDLER(dprintf("DOSStreamHandler: IFFCMD_READ...\n"));
  33         D(bug("   Reading %ld bytes\n", cmd->sc_NBytes));
  34
  35         error = Read(
  36                 (BPTR)iff->iff_Stream,
  37                 cmd->sc_Buf,
  38                 cmd->sc_NBytes) != cmd->sc_NBytes;
  39
  40         break;
  41
  42     case IFFCMD_WRITE:
  43         DEBUG_BUFSTREAMHANDLER(dprintf("DOSStreamHandler: IFFCMD_WRITE...\n"));
  44         D(bug("   Writing %ld bytes\n", cmd->sc_NBytes));
  45
  46         error = Write(
  47                 (BPTR)iff->iff_Stream,
  48                 cmd->sc_Buf,
  49                 cmd->sc_NBytes) != cmd->sc_NBytes;
  50
  51         break;
  52
  53     case IFFCMD_SEEK:
  54         DEBUG_BUFSTREAMHANDLER(dprintf("DOSStreamHandler: IFFCMD_SEEK...\n"));
  55         D(bug("   Seeking %ld bytes\n", cmd->sc_NBytes));
  56
  57         error = Seek((BPTR)iff->iff_Stream, cmd->sc_NBytes, OFFSET_CURRENT) == -1;
  58
  59         break;
  60
  61     case IFFCMD_INIT:
  62
  63         DEBUG_BUFSTREAMHANDLER(dprintf("DOSStreamHandler: IFFCMD_INIT...\n"));
  64
  65         /* Don't need these for dos streams
  66         */
  67         error = 0;
  68         break;
  69
  70     case IFFCMD_CLEANUP:
  71
  72         DEBUG_BUFSTREAMHANDLER(dprintf("DOSStreamHandler: IFFCMD_CLEANUP...\n"));
  73
  74         /* Force stream to beginning, some applications assume stream is at
  75            beginning after failed OpenIFF()'s IFFCMD_CLEANUP. This fixed pbs
  76            with multiview and certain jpeg files, for example. - Piru
  77         */
  78         error = Seek((BPTR)iff->iff_Stream, 0, OFFSET_BEGINNING) == -1;
  79         break;
  80     }
  81
  82     DEBUG_DOSSTREAMHANDLER(dprintf("DOSStreamHandler: return %ld\n", error));
  83     return (error);
  84 }