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Merge pull request #1020 from Asnivor/CDFS 

DiscSystem - CDFS classes now consume CD-I discs
This commit is contained in:
zeromus 2017-10-22 15:12:32 -05:00 committed by GitHub
parent b367f28971 3bbce67c10
commit 3e3a64fffe
5 changed files with 754 additions and 200 deletions
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45
BizHawk.Emulation.DiscSystem/CDFS/EndianBitConverter.cs
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@ -1,5 +1,6 @@
using System; using System;
using System.Collections.Generic; using System.Collections.Generic;
using System.Linq;
using System.Text; using System.Text;
namespace BizHawk.Emulation.DiscSystem namespace BizHawk.Emulation.DiscSystem
@ -114,5 +115,49 @@ namespace BizHawk.Emulation.DiscSystem
} }
#endregion #endregion
// (asni 20171013) - Some methods I wrote that have been shoehorned in from another project to speed up development time
// If these are offensive in any way, tell me I suck and that I need to do more work with existing methods
#region Misc
/// <summary>
/// Returns a byte array of any length
/// Not really anything endian going on, but I struggled to find a better place for it
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <returns></returns>
public byte[] ReadBytes(byte[] buffer, int offset, int length)
{
return buffer.Skip(offset).Take(length).ToArray();
}
/// <summary>
/// Returns an int32 value from any size byte array
/// (careful, data may/will be truncated)
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <returns></returns>
public int ReadIntValue(byte[] buffer, int offset, int length)
{
var bytes = buffer.Skip(offset).Take(length).ToArray();
if (swap)
Array.Reverse(bytes);
if (length == 1)
return bytes.FirstOrDefault();
if (length == 2)
return BitConverter.ToInt16(bytes, 0);
int result = BitConverter.ToInt32(bytes, 0);
return result;
}
#endregion
} }
} }

6
BizHawk.Emulation.DiscSystem/CDFS/ISODirectoryNode.cs
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@ -57,7 +57,10 @@ namespace BizHawk.Emulation.DiscSystem
// Read the record // Read the record
record = new ISONodeRecord(); record = new ISONodeRecord();
record.Parse(s); if (ISOFile.Format == ISOFile.ISOFormat.CDInteractive)
record.ParseCDInteractive(s);
if (ISOFile.Format == ISOFile.ISOFormat.ISO9660)
record.ParseISO9660(s);
//zero 24-jun-2013 - improved validity checks //zero 24-jun-2013 - improved validity checks
@ -95,6 +98,7 @@ namespace BizHawk.Emulation.DiscSystem
} }
// Add the node as a child // Add the node as a child
if (!this.Children.ContainsKey(record.Name))
this.Children.Add(record.Name, node); this.Children.Add(record.Name, node);
} }
} }

118
BizHawk.Emulation.DiscSystem/CDFS/ISOFile.cs
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@ -2,18 +2,20 @@
using System.Collections.Generic; using System.Collections.Generic;
using System.Text; using System.Text;
using System.IO; using System.IO;
using System.Linq;
namespace BizHawk.Emulation.DiscSystem namespace BizHawk.Emulation.DiscSystem
{ {
/// <summary> /// <summary>
/// This class is meant to parse disk images as specified by ISO9660. /// This class is meant to parse disk images as specified by:
/// Specifically, it should work for most disk images that are created ///
/// ISO9660
/// -------
/// It should work for most disk images that are created
/// by the stanard disk imaging software. This class is by no means /// by the stanard disk imaging software. This class is by no means
/// robust to all variations of ISO9660. /// robust to all variations of ISO9660.
/// Also, this class does not currently support the UDF file system. /// Also, this class does not currently support the UDF file system.
/// ///
/// TODO: Add functions to enumerate a directory or visit a file...
///
/// The information for building class came from three primary sources: /// The information for building class came from three primary sources:
/// 1. The ISO9660 wikipedia article: /// 1. The ISO9660 wikipedia article:
/// http://en.wikipedia.org/wiki/ISO_9660 /// http://en.wikipedia.org/wiki/ISO_9660
@ -21,6 +23,28 @@ namespace BizHawk.Emulation.DiscSystem
/// http://alumnus.caltech.edu/~pje/iso9660.html /// http://alumnus.caltech.edu/~pje/iso9660.html
/// 3. The ISO 9660 File System /// 3. The ISO 9660 File System
/// http://users.telenet.be/it3.consultants.bvba/handouts/ISO9960.html /// http://users.telenet.be/it3.consultants.bvba/handouts/ISO9960.html
///
///
/// CD-I
/// ----
/// (asni - 20171013) - Class modified to be able to detect and consume Green
/// Book disc images.
///
/// The implemtation of CD-I in this class adds some (but not all) additional
/// properties to the class structures that CD-I brings. This means that
/// the same ISO class structures can be returned for both standards.
/// These small additions are readily found in ISOVolumeDescriptor.cs
///
/// ISOFile.cs also now contains a public 'ISOFormat' enum that is set
/// during disc parsing.
///
/// The main reference source for this implementation:
/// 1. The CD-I Full Functional Specification (aka Green Book)
/// https://www.lscdweb.com/data/downloadables/2/8/cdi_may94_r2.pdf
///
///
/// TODO: Add functions to enumerate a directory or visit a file...
///
/// </summary> /// </summary>
public class ISOFile public class ISOFile
{ {
@ -33,6 +57,17 @@ namespace BizHawk.Emulation.DiscSystem
#endregion #endregion
#region Static Members
/// <summary>
/// Making this a static for now. Every other way I tried was fairly ineligant (asni)
/// </summary>
public static ISOFormat Format;
public static List<CDIPathNode> CDIPathTable;
#endregion
#region Public Members #region Public Members
/// <summary> /// <summary>
@ -46,6 +81,11 @@ namespace BizHawk.Emulation.DiscSystem
/// </summary> /// </summary>
public ISODirectoryNode Root; public ISODirectoryNode Root;
/// <summary>
/// The type of CDFS format detected
/// </summary>
public ISOFormat CDFSType;
#endregion #endregion
#region Construction #region Construction
@ -87,6 +127,8 @@ namespace BizHawk.Emulation.DiscSystem
bool isValid = desc.Parse(s); bool isValid = desc.Parse(s);
if (!isValid) return false; if (!isValid) return false;
this.CDFSType = Format;
if (desc.IsTerminator()) if (desc.IsTerminator())
break; break;
else if (desc.Type < 4) else if (desc.Type < 4)
@ -106,6 +148,7 @@ namespace BizHawk.Emulation.DiscSystem
// return; // return;
//} //}
//zero 24-jun-2013 - if theres no volume descriptors, we're gonna call this not a cdfs //zero 24-jun-2013 - if theres no volume descriptors, we're gonna call this not a cdfs
if (VolumeDescriptors.Count == 0) return false; if (VolumeDescriptors.Count == 0) return false;
@ -116,12 +159,68 @@ namespace BizHawk.Emulation.DiscSystem
// Create (and visit) the root node // Create (and visit) the root node
this.Root = new ISODirectoryNode(this.VolumeDescriptors[0].RootDirectoryRecord); this.Root = new ISODirectoryNode(this.VolumeDescriptors[0].RootDirectoryRecord);
visitedNodes.Add(this.Root.Offset, this.Root); visitedNodes.Add(this.Root.Offset, this.Root);
this.Root.Parse(s, visitedNodes); this.Root.Parse(s, visitedNodes);
return true; return true;
} }
private List<KeyValuePair<string, ISOFileNode>> fileNodes;
private List<ISODirectoryNode> dirsParsed;
/// <summary>
/// Returns a flat list of all recursed files
/// </summary>
/// <returns></returns>
public List<KeyValuePair<string, ISOFileNode>> EnumerateAllFilesRecursively()
{
fileNodes = new List<KeyValuePair<string, ISOFileNode>>();
dirsParsed = new List<ISODirectoryNode>();
if (Root.Children == null)
return fileNodes;
// get all folders
List<KeyValuePair<string, ISONode>> dirs = (from a in Root.Children
where a.Value.GetType() == typeof(ISODirectoryNode)
select a).ToList();
// iterate through each folder
foreach (var d in dirs)
{
// process all files in this directory (and recursively process files in sub folders
ISODirectoryNode idn = d.Value as ISODirectoryNode;
if (dirsParsed.Where(a => a == idn).Count() > 0)
continue;
dirsParsed.Add(idn);
ProcessDirectoryFiles(idn.Children);
}
return fileNodes.Distinct().ToList();
}
private void ProcessDirectoryFiles(Dictionary<string, ISONode> idn)
{
foreach (var n in idn)
{
if (n.Value.GetType() == typeof(ISODirectoryNode))
{
if (dirsParsed.Where(a => a == n.Value).Count() > 0)
continue;
dirsParsed.Add(n.Value as ISODirectoryNode);
ProcessDirectoryFiles((n.Value as ISODirectoryNode).Children);
}
else
{
KeyValuePair<string, ISOFileNode> f = new KeyValuePair<string, ISOFileNode>(n.Key, n.Value as ISOFileNode);
fileNodes.Add(f);
}
}
}
#endregion #endregion
#region Printing #region Printing
@ -136,5 +235,16 @@ namespace BizHawk.Emulation.DiscSystem
} }
#endregion #endregion
#region Misc
public enum ISOFormat
{
Unknown,
ISO9660,
CDInteractive
}
#endregion
} }
} }

111
BizHawk.Emulation.DiscSystem/CDFS/ISONodeRecord.cs
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@ -31,6 +31,12 @@ namespace BizHawk.Emulation.DiscSystem
/// </summary> /// </summary>
public byte Length; public byte Length;
/// <summary>
/// This is the number of blocks at the beginning of the file reserved for extended attribute information
/// The format of the extended attribute record is not defined and is reserved for application use
/// </summary>
public byte ExtendedAttribRecordLength;
/// <summary> /// <summary>
/// The file offset of the data for this file/directory (in sectors). /// The file offset of the data for this file/directory (in sectors).
/// </summary> /// </summary>
@ -148,14 +154,19 @@ namespace BizHawk.Emulation.DiscSystem
// Put the array into a memory stream and pass to the main parsing function // Put the array into a memory stream and pass to the main parsing function
MemoryStream s = new MemoryStream(data); MemoryStream s = new MemoryStream(data);
s.Seek(cursor, SeekOrigin.Begin); s.Seek(cursor, SeekOrigin.Begin);
this.Parse(s);
if (ISOFile.Format == ISOFile.ISOFormat.ISO9660)
this.ParseISO9660(s);
if (ISOFile.Format == ISOFile.ISOFormat.CDInteractive)
this.ParseCDInteractive(s);
} }
/// <summary> /// <summary>
/// Parse the node record from the given stream. /// Parse the node record from the given ISO9660 stream.
/// </summary> /// </summary>
/// <param name="s">The stream to parse from.</param> /// <param name="s">The stream to parse from.</param>
public void Parse(Stream s) public void ParseISO9660(Stream s)
{ {
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian(); EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
long startPosition = s.Position; long startPosition = s.Position;
@ -212,6 +223,100 @@ namespace BizHawk.Emulation.DiscSystem
s.Seek(startPosition + this.Length, SeekOrigin.Begin); s.Seek(startPosition + this.Length, SeekOrigin.Begin);
} }
/// <summary>
/// Parse the node record from the given CD-I stream.
/// </summary>
/// <param name="s">The stream to parse from.</param>
public void ParseCDInteractive(Stream s)
{
/*
BP Size in bytes Description
1 1 Record length
2 1 Extended Attribute record length
3 4 Reserved
7 4 File beginning LBN
11 4 Reserved
15 4 File size
19 6 Creation date
25 1 Reserved
26 1 File flags
27 2 Interleave
29 2 Reserved
31 2 Album Set Sequence number
33 1 File name size
34 (n) File name
34+n 4 Owner ID
38+n 2 Attributes
40+n 2 Reserved
42+n 1 File number
43+n 1 Reserved
43+n Total
*/
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
s.Position -= ISOFile.SECTOR_SIZE;
// Get the record length
this.Length = buffer[0];
// extended attribute record length
this.ExtendedAttribRecordLength = buffer[1];
// Read Data Offset
this.OffsetOfData = bcBig.ReadIntValue(buffer, 6, 4);
// Read Data Length
this.LengthOfData = bcBig.ReadIntValue(buffer, 14, 4);
// Read the time
var ti = bc.ReadBytes(buffer, 18, 6);
this.Year = ti[0];
this.Month = ti[1];
this.Day = ti[2];
this.Hour = ti[3];
this.Minute = ti[4];
this.Second = ti[5];
// read interleave - still to do
// read album (volume) set sequence number (we are ignoring this)
// Read the name length
this.NameLength = buffer[32];
// Read the file/directory name
var name = bc.ReadBytes(buffer, 33, this.NameLength);
if (this.NameLength == 1 && (name[0] == 0 || name[0] == 1))
{
if (name[0] == 0)
this.Name = ISONodeRecord.CURRENT_DIRECTORY;
else
this.Name = ISONodeRecord.PARENT_DIRECTORY;
}
else
{
this.Name = ASCIIEncoding.ASCII.GetString(name, 0, this.NameLength);
}
// skip ownerID for now
// read the flags - only really interested in the directory attribute (bit 15)
// (confusingly these are called 'attributes' in CD-I. the CD-I 'File Flags' entry is something else entirely)
this.Flags = buffer[37 + this.NameLength];
// skip filenumber
//this.FileNumber = buffer[41 + this.NameLength];
// Seek to end
s.Seek(startPosition + this.Length, SeekOrigin.Begin);
}
#endregion #endregion
} }
} }

322
BizHawk.Emulation.DiscSystem/CDFS/ISOVolumeDescriptor.cs
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@ -27,6 +27,13 @@ namespace BizHawk.Emulation.DiscSystem
#endregion #endregion
#region Private Properties
private EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
private EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
#endregion
#region Public Properties #region Public Properties
/// <summary> /// <summary>
@ -66,19 +73,19 @@ namespace BizHawk.Emulation.DiscSystem
/// </summary> /// </summary>
public int PathTableSize; public int PathTableSize;
/// <summary> /// <summary>
/// Sector offset of the first path table /// (ISO9660 only) Sector offset of the first path table
/// </summary> /// </summary>
public int OffsetOfFirstLittleEndianPathTable; public int OffsetOfFirstLittleEndianPathTable;
/// <summary> /// <summary>
/// Sector offset of the second path table /// (ISO9660 only) Sector offset of the second path table
/// </summary> /// </summary>
public int OffsetOfSecondLittleEndianPathTable; public int OffsetOfSecondLittleEndianPathTable;
/// <summary> /// <summary>
/// Sector offset of the first path table /// (ISO9660 only) Sector offset of the first path table
/// </summary> /// </summary>
public int OffsetOfFirstBigEndianPathTable; public int OffsetOfFirstBigEndianPathTable;
/// <summary> /// <summary>
/// Sector offset of the second path table /// (ISO9660 only) Sector offset of the second path table
/// </summary> /// </summary>
public int OffsetOfSecondBigEndianPathTable; public int OffsetOfSecondBigEndianPathTable;
@ -135,10 +142,34 @@ namespace BizHawk.Emulation.DiscSystem
public byte[] EffectiveDateTime; public byte[] EffectiveDateTime;
/// <summary> /// <summary>
/// Extra reserved data /// (ISO9660 only) Extra reserved data
/// </summary> /// </summary>
public byte[] Reserved; public byte[] Reserved;
// CD-Interactive only
/// <summary>
/// The bits of this field are numbered from 0 to 7 starting with the least significant bit
/// BitPosition 0: A value of 0 = the coded character set identifier field specifies only an escape sequence registered according to ISO 2375
/// A value of 1 = the coded character set identifier field specifies only an escape sequence NOT registered according to ISO 2375
/// BitPostion 1-7: All bits are 0 (reserved for future standardization)
/// </summary>
public byte VolumeFlags;
/// <summary>
/// This field specifies one escape sequence according to the International Register of Coded Character Sets to be used with escape
/// sequence standards for recording.The ESC character, which is the first character of all sequences, shall be omitted when recording this field
/// </summary>
public byte[] CodedCharSetIdent;
/// <summary>
/// The block address of the first block of the system Path Table is kept in this field
/// </summary>
public int AddressOfPathTable;
/// <summary>
/// This number is used to indicate the revision number of the file structure standard to which the
/// directory search files conform. It is set to one
/// </summary>
#endregion #endregion
#region Construction #region Construction
@ -183,6 +214,11 @@ namespace BizHawk.Emulation.DiscSystem
this.EffectiveDateTime = new byte[LENGTH_TIME]; this.EffectiveDateTime = new byte[LENGTH_TIME];
this.Reserved = new byte[LENGTH_RESERVED]; this.Reserved = new byte[LENGTH_RESERVED];
// CD-I specific
this.VolumeFlags = 0;
this.CodedCharSetIdent = new byte[LENGTH_SHORT_IDENTIFIER];
this.AddressOfPathTable = 0;
} }
#endregion #endregion
@ -190,33 +226,45 @@ namespace BizHawk.Emulation.DiscSystem
#region Parsing #region Parsing
/// <summary> /// <summary>
/// Parse the volume descriptor header. /// Start parsing the volume descriptor header.
/// </summary> /// </summary>
/// <param name="s">The stream to parse from.</param> /// <param name="s">The stream to parse from.</param>
public bool Parse(Stream s) public bool Parse(Stream s)
{ {
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
long startPosition = s.Position; long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE]; byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Read the entire structure // Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE); s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
// Get the type // Parse based on format
this.Type = buffer[0]; byte[] header = bc.ReadBytes(buffer, 0, ISOFile.SECTOR_SIZE);
if (GetISO9660(header))
//zero 24-jun-2013 - validate
// "CD001" + 0x01
if (buffer[1] == 'C' && buffer[2] == 'D' && buffer[3] == '0' && buffer[4] == '0' && buffer[5] == '1' && buffer[6] == 0x01)
{ {
//it seems to be a valid volume descriptor ParseISO9660(s);
return true;
} }
else if (GetCDI(header))
{ {
ParseCDInteractive(s);
return true;
}
return false; return false;
} }
public void ParseISO9660(Stream s)
{
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
s.Position = startPosition - ISOFile.SECTOR_SIZE;
// Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
// Get the type
this.Type = buffer[0];
// Handle the primary volume information // Handle the primary volume information
if (this.Type == 1) if (this.Type == 1)
{ {
@ -304,10 +352,147 @@ namespace BizHawk.Emulation.DiscSystem
this.Reserved, 0, LENGTH_RESERVED); this.Reserved, 0, LENGTH_RESERVED);
cursor += LENGTH_RESERVED; cursor += LENGTH_RESERVED;
} }
}
public void ParseCDInteractive(Stream s)
{
/* From the Green Book Spec
* BP (byte position) obviously is n+1
BP Size in Bytes Description
1 1 Disc Label Record Type
2 5 Volume Structure Standard ID
7 1 Volume Structure Version number
8 1 Volume flags
9 32 System identifier
41 32 Volume identifier
73 12 Reserved
85 4 Volume space size
89 32 Coded Character Set identifier
121 2 Reserved
123 2 Number of Volumes in Album
125 2 Reserved
127 2 Album Set Sequence number
129 2 Reserved
131 2 Logical Block size
133 4 Reserved
137 4 Path Table size
141 8 Reserved
149 4 Address of Path Table
153 38 Reserved
191 128 Album identifier
319 128 Publisher identifier
447 128 Data Preparer identifier
575 128 Application identifier
703 32 Copyright file name
735 5 Reserved
740 32 Abstract file name
772 5 Reserved
777 32 Bibliographic file name
809 5 Reserved
814 16 Creation date and time
830 1 Reserved
831 16 Modification date and time
847 1 Reserved
848 16 Expiration date and time
864 1 Reserved
865 16 Effective date and time
881 1 Reserved
882 1 File Structure Standard Version number
883 1 Reserved
884 512 Application use
1396 653 Reserved */
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
s.Position = startPosition - ISOFile.SECTOR_SIZE;
// Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
// Get the type
this.Type = buffer[0];
// Handle the primary volume information
if (this.Type == 1)
{
this.VolumeFlags = buffer[7];
this.SystemIdentifier = bc.ReadBytes(buffer, 8, LENGTH_SHORT_IDENTIFIER);
this.VolumeIdentifier = bc.ReadBytes(buffer, 40, LENGTH_SHORT_IDENTIFIER);
this.NumberOfSectors = bcBig.ReadIntValue(buffer, 84, 4);
this.CodedCharSetIdent = bc.ReadBytes(buffer, 88, LENGTH_SHORT_IDENTIFIER);
this.VolumeSetSize = bcBig.ReadIntValue(buffer, 122, 2);
this.VolumeSequenceNumber = bcBig.ReadIntValue(buffer, 126, 2);
this.SectorSize = bcBig.ReadIntValue(buffer, 130, 2);
this.PathTableSize = bcBig.ReadIntValue(buffer, 136, 4);
this.AddressOfPathTable = bcBig.ReadIntValue(buffer, 148, 4);
this.VolumeSetIdentifier = bc.ReadBytes(buffer, 190, LENGTH_LONG_IDENTIFIER);
this.PublisherIdentifier = bc.ReadBytes(buffer, 318, LENGTH_LONG_IDENTIFIER);
this.DataPreparerIdentifier = bc.ReadBytes(buffer, 446, LENGTH_LONG_IDENTIFIER);
this.ApplicationIdentifier = bc.ReadBytes(buffer, 574, LENGTH_LONG_IDENTIFIER);
this.CopyrightFileIdentifier = bc.ReadBytes(buffer, 702, LENGTH_SHORT_IDENTIFIER);
this.AbstractFileIdentifier = bc.ReadBytes(buffer, 739, LENGTH_SHORT_IDENTIFIER);
this.BibliographicalFileIdentifier = bc.ReadBytes(buffer, 776, LENGTH_SHORT_IDENTIFIER);
this.VolumeCreationDateTime = bc.ReadBytes(buffer, 813, 16);
this.LastModifiedDateTime = bc.ReadBytes(buffer, 830, 16);
this.ExpirationDateTime = bc.ReadBytes(buffer, 847, 16);
this.EffectiveDateTime = bc.ReadBytes(buffer, 864, 16);
// save current position
long pos = s.Position;
// get path table records
s.Position = ISOFile.SECTOR_SIZE * this.AddressOfPathTable;
ISOFile.CDIPathTable = CDIPathNode.ParsePathTable(s, this.PathTableSize);
// read the root dir record
s.Position = ISOFile.SECTOR_SIZE * ISOFile.CDIPathTable[0].DirectoryBlockAddress;
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
this.RootDirectoryRecord.Parse(buffer, 0);
// go back to where we were
s.Position = pos;
}
}
/// <summary>
/// Detect ISO9660
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public bool GetISO9660(byte[] buffer)
{
//zero 24-jun-2013 - validate ISO9660
// "CD001" + 0x01
if (buffer[1] == 'C' && buffer[2] == 'D' && buffer[3] == '0' && buffer[4] == '0' && buffer[5] == '1' && buffer[6] == 0x01)
{
ISOFile.Format = ISOFile.ISOFormat.ISO9660;
return true; return true;
} }
return false;
}
/// <summary>
/// Detect CD-I
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public bool GetCDI(byte[] buffer)
{
// CD-Interactive
if (Encoding.ASCII.GetString(bc.ReadBytes(buffer, 1, 5)).Contains("CD-I"))
{
ISOFile.Format = ISOFile.ISOFormat.CDInteractive;
return true;
}
return false;
}
#endregion #endregion
#region Type Information #region Type Information
@ -321,6 +506,111 @@ namespace BizHawk.Emulation.DiscSystem
return (this.Type == 255); return (this.Type == 255);
} }
#endregion
}
/// <summary>
/// Represents a Directory Path Table entry on a CD-I disc
/// </summary>
public class CDIPathNode
{
#region Public Properties
/// <summary>
/// The length of the directory name.
/// </summary>
public byte NameLength;
/// <summary>
/// This is the length of the Extended Attribute record
/// </summary>
public byte ExtendedAttribRecordLength;
/// <summary>
/// This field contains the beginning logical block number (LBN) of the directory file on disc
/// </summary>
public int DirectoryBlockAddress;
/// <summary>
/// This is the number (relative to the beginning of the Path Table) of this directory's parent
/// </summary>
public int ParentDirectoryNumber;
/// <summary>
/// The directory name.
/// This variable length field is used to store the actual text representing the name of the directory.
/// If the length of the file name is odd, a null padding byte is added to make the size of the Path Table record even.
/// The padding byte is not included in the name size field.
/// </summary>
public string Name;
#endregion
#region Construction
/// <summary>
/// Empty Constructor
/// </summary>
public CDIPathNode()
{
}
#endregion
#region Parsing
/*
BP Size in bytes Description
1 1 Name size
2 1 Extended Attribute record length
3 4 Directory block address
7 2 Parent Directory number
9 n Directory file name
*/
public static List<CDIPathNode> ParsePathTable(Stream s, int PathTableSize)
{
EndianBitConverter bc = EndianBitConverter.CreateForLittleEndian();
EndianBitConverter bcBig = EndianBitConverter.CreateForBigEndian();
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
int startCursor = 0;
List<CDIPathNode> pathNodes = new List<CDIPathNode>();
int pad = 0;
do
{
CDIPathNode node = new CDIPathNode();
byte[] data = bc.ReadBytes(buffer, startCursor, ISOFile.SECTOR_SIZE - startCursor);
node.NameLength = data[0];
node.ExtendedAttribRecordLength = data[1];
node.DirectoryBlockAddress = bcBig.ReadIntValue(data, 2, 4);
node.ParentDirectoryNumber = bcBig.ReadIntValue(data, 6, 2);
node.Name = Encoding.ASCII.GetString(bc.ReadBytes(data, 8, data[0]));
// if nameLength is odd a padding byte must be added
if (node.NameLength % 2 != 0)
pad = 1;
pathNodes.Add(node);
startCursor += node.NameLength + 8;
} while (startCursor < PathTableSize + pad);
return pathNodes;
}
#endregion #endregion
} }
} }