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249 lines
11 KiB
C#
249 lines
11 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Mode2.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : ISO9660 filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Handles reading sectors in MODE 0, 1 and 2.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2025 Natalia Portillo
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// In the loving memory of Facunda "Tata" Suárez Domínguez, R.I.P. 2019/07/24
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// ****************************************************************************/
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using System;
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using System.IO;
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using Aaru.CommonTypes.Enums;
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using Aaru.Decoders.CD;
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using Aaru.Logging;
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namespace Aaru.Filesystems;
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public sealed partial class ISO9660
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{
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ErrorNumber ReadSector(ulong sector, out byte[] buffer, bool interleaved = false, byte fileNumber = 0)
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{
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ErrorNumber errno;
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buffer = null;
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uint sectorCount = (uint)_blockSize / 2048;
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if(_blockSize % 2048 > 0) sectorCount++;
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ulong realSector = sector * _blockSize / 2048;
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ulong offset = sector * _blockSize % 2048;
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byte[] data;
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if(sectorCount == 1)
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{
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errno = _image.ReadSectorLong(realSector, out data);
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if(errno != ErrorNumber.NoError) errno = _image.ReadSector(realSector, out data);
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if(errno != ErrorNumber.NoError) return errno;
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if(_debug)
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{
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switch(data.Length)
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{
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case 2048:
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AaruLogging.Debug(MODULE_NAME,
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Localization.tor_Sector_0_Cooked_Mode_zero_one_Mode_two_Form_one,
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realSector);
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break;
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case 2324:
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AaruLogging.Debug(MODULE_NAME,
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Localization.tor_Sector_0_Cooked_Mode_two_Form_two,
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realSector);
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break;
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case 2336:
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AaruLogging.Debug(MODULE_NAME,
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Localization
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.tor_Sector_0_Cooked_Mode_two_Form_1_File_Number_2_Channel_Number_3_Submode_4_Coding_Information_5,
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realSector,
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((Mode2Submode)data[2]).HasFlag(Mode2Submode.Form2) ? 2 : 1,
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data[0],
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data[1],
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(Mode2Submode)data[2],
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data[3]);
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break;
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case 2352 when data[0] != 0x00 ||
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data[1] != 0xFF ||
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data[2] != 0xFF ||
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data[3] != 0xFF ||
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data[4] != 0xFF ||
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data[5] != 0xFF ||
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data[6] != 0xFF ||
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data[7] != 0xFF ||
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data[8] != 0xFF ||
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data[9] != 0xFF ||
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data[10] != 0xFF ||
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data[11] != 0x00:
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AaruLogging.Debug(MODULE_NAME, Localization.tor_Sector_0_Raw_Audio, realSector);
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break;
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case 2352 when data[15] != 2:
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AaruLogging.Debug(MODULE_NAME,
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Localization.tor_Sector_0_1_2_3_Raw_Mode_4,
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realSector,
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data[12],
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data[13],
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data[14],
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data[15]);
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break;
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case 2352:
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AaruLogging.Debug(MODULE_NAME,
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Localization
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.tor_Sector_0_1_2_3_Raw_Mode_two_Form_4_File_Number_5_Channel_Number_6_Submode_7_Coding_Information_8,
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realSector,
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data[12],
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data[13],
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data[14],
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((Mode2Submode)data[18]).HasFlag(Mode2Submode.Form2) ? 2 : 1,
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data[16],
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data[17],
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(Mode2Submode)data[18],
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data[19]);
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break;
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}
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}
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if(_blockSize == 2048)
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{
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buffer = Sector.GetUserData(data, interleaved, fileNumber);
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return ErrorNumber.NoError;
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}
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byte[] tmp = new byte[_blockSize];
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Array.Copy(Sector.GetUserData(data, interleaved, fileNumber), (int)offset, tmp, 0, _blockSize);
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buffer = tmp;
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return errno;
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}
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else
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{
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var ms = new MemoryStream();
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for(uint i = 0; i < sectorCount; i++)
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{
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ulong dstSector = realSector + 1;
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errno = _image.ReadSectorLong(dstSector, out data);
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if(errno != ErrorNumber.NoError) errno = _image.ReadSector(dstSector, out data);
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if(errno != ErrorNumber.NoError) return errno;
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if(_debug)
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{
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switch(data.Length)
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{
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case 2048:
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AaruLogging.Debug(MODULE_NAME,
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Localization.tor_Sector_0_Cooked_Mode_zero_one_Mode_two_Form_one,
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dstSector);
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break;
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case 2324:
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AaruLogging.Debug(MODULE_NAME,
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Localization.tor_Sector_0_Cooked_Mode_two_Form_two,
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dstSector);
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break;
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case 2336:
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AaruLogging.Debug(MODULE_NAME,
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Localization
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.tor_Sector_0_Cooked_Mode_two_Form_1_File_Number_2_Channel_Number_3_Submode_4_Coding_Information_5,
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dstSector,
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((Mode2Submode)data[2]).HasFlag(Mode2Submode.Form2) ? 2 : 1,
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data[0],
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data[1],
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(Mode2Submode)data[2],
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data[3]);
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break;
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case 2352 when data[0] != 0x00 ||
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data[1] != 0xFF ||
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data[2] != 0xFF ||
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data[3] != 0xFF ||
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data[4] != 0xFF ||
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data[5] != 0xFF ||
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data[6] != 0xFF ||
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data[7] != 0xFF ||
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data[8] != 0xFF ||
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data[9] != 0xFF ||
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data[10] != 0xFF ||
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data[11] != 0x00:
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AaruLogging.Debug(MODULE_NAME, Localization.tor_Sector_0_Raw_Audio, dstSector);
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break;
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case 2352 when data[15] != 2:
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AaruLogging.Debug(MODULE_NAME,
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Localization.tor_Sector_0_1_2_3_Raw_Mode_4,
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dstSector,
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data[12],
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data[13],
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data[14],
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data[15]);
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break;
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case 2352:
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AaruLogging.Debug(MODULE_NAME,
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Localization
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.tor_Sector_0_1_2_3_Raw_Mode_two_Form_4_File_Number_5_Channel_Number_6_Submode_7_Coding_Information_8,
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dstSector,
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data[12],
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data[13],
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data[14],
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((Mode2Submode)data[18]).HasFlag(Mode2Submode.Form2) ? 2 : 1,
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data[16],
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data[17],
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(Mode2Submode)data[18],
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data[19]);
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break;
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}
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}
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byte[] sectorData = Sector.GetUserData(data, interleaved, fileNumber);
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ms.Write(sectorData, 0, sectorData.Length);
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}
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byte[] tmp = new byte[_blockSize];
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Array.Copy(Sector.GetUserData(ms.ToArray(), interleaved, fileNumber), 0, tmp, 0, _blockSize);
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buffer = tmp;
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return ErrorNumber.NoError;
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}
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}
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} |