/*
* 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);
}
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>
/// 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);
}
