FryingPan/DTLib/rISOData.cpp

   1 /*
   2  * FryingPan - Amiga CD/DVD Recording Software (User Interface and supporting Libraries only)
   3  * Copyright (C) 2001-2011 Tomasz Wiszkowski Tomasz.Wiszkowski at gmail.com
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation; either version 2.1
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include "rISOData.h"
  21 #include <libclass/dos.h>
  22 #include <libclass/exec.h>
  23 #include <libclass/utility.h>
  24
  25 #define MKID(a,b,c,d) (((a&255)<<24)|((b&255)<<16)|((c&255)<<8)|(d&255))
  26 #define ID_CD00 MKID('C','D','0','0')
  27
  28
  29 IFileReader          *rISOData::openRead(const char* sFile, EDtError &rc)
  30 {
  31    rISOData *pSkel = 0;
  32    if (true == checkFile(sFile, rc))
  33    {
  34       pSkel = new rISOData(sFile, rc);
  35    }
  36    return pSkel;
  37 }
  38
  39 rISOData::rISOData(const char *sName, EDtError &rc)
  40     : FileReader(sName, rc)
  41 {
  42    if (rc != DT_OK)
  43       return;
  44
  45    setBlockSize(2048);
  46    setLittleEndian(true); // so it is not touched
  47    setType(Data_Mode1);
  48
  49    {
  50       BPTR fh;
  51       uint8 *ut = new uint8[4096];
  52       int64 sz = 0;
  53
  54       fh = DOS->Open((char*)sName, MODE_OLDFILE);
  55       // seek to primary vol descriptor + volume space size + MSB data
  56
  57       for (int i=0; i<9; i++)
  58          DOS->Read(fh, ut, 4096);
  59
  60       sz = (ut[84] << 24) | (ut[85] << 16) | (ut[86] << 8) | ut[87];
  61       sz = (sz + 15) & ~15;
  62
  63       DOS->Close(fh);
  64       delete [] ut;
  65       setDataSize(sz << 11);
  66    }
  67 }
  68
  69 bool                 rISOData::checkFile(const char* sFileName, EDtError &rc)
  70 {
  71    bool            ok = true;
  72    BPTR            fh;
  73
  74    rc = DT_UnableToOpenFile;
  75
  76    fh = DOS->Open(const_cast<char*>(sFileName), MODE_OLDFILE);
  77    if (0 == fh)
  78       return false;
  79
  80    uint8 *ut = new uint8[4096];
  81
  82    for (int i=0; i<9; i++)
  83    {
  84       if (DOS->Read(fh, ut, 4096) < 4096)
  85          ok = false;
  86       if (!ok)
  87          break;
  88    }
  89
  90    if (!ok)
  91    {
  92       rc = DT_FileMalformed;
  93    }
  94    else
  95    {
  96       if (ut[1] != 'C')
  97          ok = false;
  98       if (ut[2] != 'D')
  99          ok = false;
 100       if (ut[3] != '0')
 101          ok = false;
 102       if (ut[4] != '0')
 103          ok = false;
 104       if (ut[5] != '1')
 105          ok = false;
 106
 107       if (!ok)
 108          rc = DT_InvalidFormat;
 109    }
 110
 111    DOS->Close(fh);
 112    delete [] ut;
 113    return ok;
 114 }
 115
 116 const char          *rISOData::static_getName()
 117 {
 118    return "ISO Disc Image Reader";
 119 }
 120
 121 bool                 rISOData::static_isAudio()
 122 {
 123    return false;
 124 }
 125
 126 bool                 rISOData::static_isData()
 127 {
 128    return true;
 129 }
 130
 131 bool                 rISOData::static_isSession()
 132 {
 133    return false;
 134 }
 135
 136 bool                 rISOData::isAudio()
 137 {
 138    return static_isAudio();
 139 }
 140
 141 bool                 rISOData::isData()
 142 {
 143    return static_isData();
 144 }
 145
 146 const char          *rISOData::getName()
 147 {
 148    return static_getName();
 149 }
 150
 151 // vim: ts=3 et