/*
* 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);
}
/// <summary>
/// Start parsing the volume descriptor header.
/// </summary>
/// <param name="s">The stream to parse from.</param>
public bool Parse(Stream s)
{
long startPosition = s.Position;
byte[] buffer = new byte[ISOFile.SECTOR_SIZE];
// Read the entire structure
s.Read(buffer, 0, ISOFile.SECTOR_SIZE);
// Parse based on format
byte[] header = bc.ReadBytes(buffer, 0, ISOFile.SECTOR_SIZE);
if (GetISO9660(header))
{
ParseISO9660(s);
return(true);
}
if (GetCDI(header))
{
ParseCDInteractive(s);
return(true);
}
return(false);
}
/// <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);
}
