327 lines
9.0 KiB
C#
327 lines
9.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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namespace BizHawk.Emulation.DiscSystem
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{
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/// <summary>
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/// Represents a volume descriptor for a disk image.
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/// </summary>
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public class ISOVolumeDescriptor
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{
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#region Constants
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/// <summary>
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/// We are handling the parsing by reading the entire header and
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/// extracting the appropriate bytes.
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///
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/// This is done for performance reasons.
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/// </summary>
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private const int LENGTH_SHORT_IDENTIFIER = 32;
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private const int LENGTH_IDENTIFIER = 37;
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private const int LENGTH_LONG_IDENTIFIER = 128;
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private const int LENGTH_ROOT_DIRECTORY_RECORD = 34;
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private const int LENGTH_TIME = 17;
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private const int LENGTH_RESERVED = 512;
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#endregion
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#region Public Properties
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/// <summary>
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/// The type of this volume description, only 1 and 255 are supported
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/// </summary>
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public byte Type;
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/// <summary>
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/// The system identifier
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/// </summary>
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public byte[] SystemIdentifier;
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/// <summary>
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/// The volume identifier
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/// </summary>
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public byte[] VolumeIdentifier;
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/// <summary>
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/// The number of sectors on the disk
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/// </summary>
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public int NumberOfSectors;
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/// <summary>
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/// Volume Set Size (should be 1)
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/// </summary>
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public int VolumeSetSize;
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/// <summary>
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/// Volume Sequence Number (should be 1)
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/// </summary>
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public int VolumeSequenceNumber;
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/// <summary>
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/// Sector Size (should be 2048)
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/// </summary>
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public int SectorSize;
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/// <summary>
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/// Size of the path table
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/// </summary>
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public int PathTableSize;
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/// <summary>
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/// Sector offset of the first path table
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/// </summary>
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public int OffsetOfFirstLittleEndianPathTable;
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/// <summary>
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/// Sector offset of the second path table
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/// </summary>
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public int OffsetOfSecondLittleEndianPathTable;
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/// <summary>
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/// Sector offset of the first path table
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/// </summary>
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public int OffsetOfFirstBigEndianPathTable;
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/// <summary>
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/// Sector offset of the second path table
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/// </summary>
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public int OffsetOfSecondBigEndianPathTable;
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/// <summary>
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/// The root directory record
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/// </summary>
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public ISONodeRecord RootDirectoryRecord;
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/// <summary>
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/// The volumen set identifier
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/// </summary>
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public byte[] VolumeSetIdentifier;
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/// <summary>
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/// The publisher identifier
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/// </summary>
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public byte[] PublisherIdentifier;
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/// <summary>
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/// The data preparer identifier
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/// </summary>
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public byte[] DataPreparerIdentifier;
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/// <summary>
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/// The application identifier
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/// </summary>
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public byte[] ApplicationIdentifier;
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/// <summary>
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/// The copyright identifier
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/// </summary>
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public byte[] CopyrightFileIdentifier;
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/// <summary>
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/// The abstract file identifier
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/// </summary>
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public byte[] AbstractFileIdentifier;
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/// <summary>
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/// The bibliographical file identifier
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/// </summary>
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public byte[] BibliographicalFileIdentifier;
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/// <summary>
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/// The time and date the volume was created
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/// </summary>
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public byte[] VolumeCreationDateTime;
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/// <summary>
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/// The time and date the volume was last modified
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/// </summary>
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public byte[] LastModifiedDateTime;
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/// <summary>
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/// The time and date the volume expires
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/// </summary>
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public byte[] ExpirationDateTime;
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/// <summary>
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/// The time and data when the volume is effective
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/// </summary>
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public byte[] EffectiveDateTime;
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/// <summary>
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/// Extra reserved data
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/// </summary>
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public byte[] Reserved;
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#endregion
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#region Construction
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/// <summary>
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/// Constructor.
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/// </summary>
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public ISOVolumeDescriptor()
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{
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// Set everything to the default value
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this.Type = 0;
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this.SystemIdentifier = new byte[LENGTH_SHORT_IDENTIFIER];
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this.VolumeIdentifier = new byte[LENGTH_SHORT_IDENTIFIER];
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this.NumberOfSectors = 0;
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this.VolumeSetSize = 1;
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this.VolumeSequenceNumber = 1;
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this.SectorSize = ISOFile.SECTOR_SIZE;
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this.PathTableSize = 0;
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this.OffsetOfFirstLittleEndianPathTable = 0;
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this.OffsetOfSecondLittleEndianPathTable = 0;
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this.OffsetOfFirstBigEndianPathTable = 0;
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this.OffsetOfSecondBigEndianPathTable = 0;
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this.RootDirectoryRecord = new ISONodeRecord();
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this.VolumeSetIdentifier = new byte[LENGTH_LONG_IDENTIFIER];
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this.PublisherIdentifier = new byte[LENGTH_LONG_IDENTIFIER];
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this.DataPreparerIdentifier = new byte[LENGTH_LONG_IDENTIFIER];
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this.ApplicationIdentifier = new byte[LENGTH_LONG_IDENTIFIER];
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this.CopyrightFileIdentifier = new byte[LENGTH_IDENTIFIER];
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this.AbstractFileIdentifier = new byte[LENGTH_IDENTIFIER];
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this.BibliographicalFileIdentifier = new byte[LENGTH_IDENTIFIER];
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this.VolumeCreationDateTime = new byte[LENGTH_TIME];
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this.LastModifiedDateTime = new byte[LENGTH_TIME];
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this.ExpirationDateTime = new byte[LENGTH_TIME];
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this.EffectiveDateTime = new byte[LENGTH_TIME];
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this.Reserved = new byte[LENGTH_RESERVED];
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}
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#endregion
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#region Parsing
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/// <summary>
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/// Parse the volume descriptor header.
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/// </summary>
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/// <param name="s">The stream to parse from.</param>
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public bool Parse(Stream s)
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{
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EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
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EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
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long startPosition = s.Position;
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byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
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// Read the entire structure
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s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
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// Get the type
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this.Type = buffer[0];
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//zero 24-jun-2013 - validate
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// "CD001" + 0x01
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if (buffer[1] == 'C' && buffer[2] == 'D' && buffer[3] == '0' && buffer[4] == '0' && buffer[5] == '1' && buffer[6] == 0x01)
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{
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//it seems to be a valid volume descriptor
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}
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else
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{
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return false;
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}
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// Handle the primary volume information
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if (this.Type == 1)
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{
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int cursor = 8;
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// Get the system identifier
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Array.Copy(buffer, cursor,
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this.SystemIdentifier, 0, LENGTH_SHORT_IDENTIFIER);
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cursor += LENGTH_SHORT_IDENTIFIER;
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// Get the volume identifier
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Array.Copy(buffer, cursor,
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this.VolumeIdentifier, 0, LENGTH_SHORT_IDENTIFIER);
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cursor += LENGTH_SHORT_IDENTIFIER;
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cursor += 8;
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// Get the total number of sectors
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this.NumberOfSectors = bc.ToInt32(buffer, cursor);
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cursor += 8;
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cursor += 32;
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this.VolumeSetSize = bc.ToInt16(buffer, cursor);
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cursor += 4;
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this.VolumeSequenceNumber = bc.ToInt16(buffer, cursor);
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cursor += 4;
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this.SectorSize = bc.ToInt16(buffer, cursor);
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cursor += 4;
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this.PathTableSize = bc.ToInt32(buffer, cursor);
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cursor += 8;
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this.OffsetOfFirstLittleEndianPathTable = bc.ToInt32(buffer, cursor);
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cursor += 4;
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this.OffsetOfSecondLittleEndianPathTable = bc.ToInt32(buffer, cursor);
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cursor += 4;
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this.OffsetOfFirstLittleEndianPathTable = bcBig.ToInt32(buffer, cursor);
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cursor += 4;
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this.OffsetOfSecondLittleEndianPathTable = bcBig.ToInt32(buffer, cursor);
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cursor += 4;
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this.RootDirectoryRecord.Parse(buffer, cursor);
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cursor += LENGTH_ROOT_DIRECTORY_RECORD;
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Array.Copy(buffer, cursor,
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this.VolumeSetIdentifier, 0, LENGTH_LONG_IDENTIFIER);
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cursor += LENGTH_LONG_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.PublisherIdentifier, 0, LENGTH_LONG_IDENTIFIER);
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cursor += LENGTH_LONG_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.DataPreparerIdentifier, 0, LENGTH_LONG_IDENTIFIER);
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cursor += LENGTH_LONG_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.ApplicationIdentifier, 0, LENGTH_LONG_IDENTIFIER);
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cursor += LENGTH_LONG_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.CopyrightFileIdentifier, 0, LENGTH_IDENTIFIER);
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cursor += LENGTH_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.AbstractFileIdentifier, 0, LENGTH_IDENTIFIER);
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cursor += LENGTH_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.BibliographicalFileIdentifier, 0, LENGTH_IDENTIFIER);
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cursor += LENGTH_IDENTIFIER;
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Array.Copy(buffer, cursor,
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this.VolumeCreationDateTime, 0, LENGTH_TIME);
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cursor += LENGTH_TIME;
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Array.Copy(buffer, cursor,
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this.LastModifiedDateTime, 0, LENGTH_TIME);
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cursor += LENGTH_TIME;
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Array.Copy(buffer, cursor,
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this.ExpirationDateTime, 0, LENGTH_TIME);
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cursor += LENGTH_TIME;
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Array.Copy(buffer, cursor,
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this.EffectiveDateTime, 0, LENGTH_TIME);
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cursor += LENGTH_TIME;
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cursor += 1;
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cursor += 1;
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Array.Copy(buffer, cursor,
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this.Reserved, 0, LENGTH_RESERVED);
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cursor += LENGTH_RESERVED;
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}
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return true;
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}
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#endregion
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#region Type Information
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/// <summary>
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/// Returns true if this is the terminator volume descriptor.
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/// </summary>
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/// <returns>True if the terminator.</returns>
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public bool IsTerminator()
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{
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return (this.Type == 255);
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}
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#endregion
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}
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}
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