/// <summary>
/// writes a file out to cd. Generate the Boot Info Table if necessary
/// </summary>
/// <param Name="f">the file to write</param>
/// <param Name="primaryVolumeDescriptor">the PVD block, passed in case we need to generate the Boot Info Table</param>
public void WriteFile(IsoFile f, int primaryVolumeDescriptor)
{
if (f.fileInfo.Length > 0xffffffff)
throw new NotImplementedException(">4G files not implemented");
int bytes = (int)f.fileInfo.Length;
if (this.fs == null)
{
this.Index += bytes;
return;
}
// TODO FIXME - create smaller reusable buffer and read fixed-size chunks at a time...
byte[] b = new byte[bytes];
using (FileStream stream = f.fileInfo.OpenRead())
{
if (bytes != stream.Read(b, 0, bytes))
throw new Exception("number of bytes read from file != reported length of file: " + f.fileInfo.Name);
}
if (f.BootInfoTable)
{
uint checksum = CalculateChecksum(b);
// TODO FIXME - this is TERRIBLE. This should be implemented at a higher level, and
// doing it here requires passing the primaryVolumeDescriptor to every call of WriteFile()
// The reason it is here is because this is the only place where the file actually gets
// pulled into memory and I didn't want to modify the boot image on-disk like mkisofs does.
Bytes(b, 0, 8);
Bytes(ConvertTo.Int2LSB(primaryVolumeDescriptor));
Bytes(ConvertTo.Int2LSB(f.DataBlock));
Bytes(ConvertTo.Int2LSB((int)f.fileInfo.Length));
Bytes(ConvertTo.Int2LSB((int)checksum));
DupByte(0, 40); // reserved
Bytes(b, 64, bytes - 64);
}
else
Bytes(b);
}
private void GenBootCatalog(IsoFile f)
{
BootCatalog = generator.Index / LogicalBlockSize;
// write validation entry first... see El Torito section 2.1
var ve = new FieldValidator(generator);
ve.Byte(1, 1); // Header ID, must be 0x01
ve.Byte(0, 2); // 0 == x86 - TODO FIXME: 1 == PowerPC, 2 == Mac, see El Torito figure 2
ve.DupByte(0, 3, 4); // Reserved
ve.DupByte(0, 5, 0x1C); // Manufacturer/Developer of CD-ROM, see El Torito figure 2
ve.ShortLSB(0x55AA, 0x1D, 0x1E); // checksum - TODO FIXME - allow custom Manufacturer string - calculate checksum dynamically
ve.Byte(0x55, 0x1F); // 1st Key Byte
ve.Byte(0xAA, 0x20); // 2nd Key Byte
// initial/default entry... see El Torito section 2.2 and figure 3
var ide = new FieldValidator(generator);
ide.Byte(0x88, 1); // 0x88 = bootable, 0x00 = not bootable
// TODO FIXME - this is extremely hackish... fix me...
ide.Byte(0, 2); // no emulation
/*if ( f.fileInfo.Length <= 1182720 )
ide.Byte(1, 2); // 1.2 meg diskette
else if ( f.fileInfo.Length <= 1440 * 1024 )
ide.Byte(2,2); // 1.44 meg diskette
else if ( f.fileInfo.Length <= 2880 * 1024 )
ide.Byte(3,2); // 2.88 meg diskette
else
ide.Byte(4,2);*/
// Hard Disk ( drive 80 )
ide.ShortLSB(0, 3, 4); // Load Segment - 0 == default of 0x7C0
ide.Byte(0, 5); // System Type, according to El Torito figure 3 this MUST be a copy of the "System Type" from the boot image. In practice this appears to not be the case.
ide.Byte(0, 6); // Unused, must be 0
if (bootLoadSize == 0)
bootLoadSize = (short)((f.fileInfo.Length - 1) / 0x200 + 1);
ide.ShortLSB(bootLoadSize, 7, 8); // Sector Count
ide.IntLSB(boot.DataBlock, 9, 12); // Logical Block of boot image
ide.Zero(13, 32); // unused
generator.FinishBlock();
}
private void GenFile(IsoFile f)
{
f.DataBlock = generator.Index / LogicalBlockSize;
f.DataLength = (int)f.fileInfo.Length;
generator.WriteFile(f, PrimaryVolumeDescriptor);
generator.FinishBlock();
}
/// <summary>
/// add a file to the ISO ( common implementation - called by AddFile() and AddBootFile() )
/// </summary>
private IsoFile AddFileEx(string path, FileInfo fileInfo)
{
string key;
string[] ar = NormalizePath(path).Split('/');
int i;
IsoFolder f = isoRoot;
for (i = 0; i < ar.Length - 1; i++)
{
key = ar[i].Trim().ToLower();
if (!f.entries.ContainsKey(key))
{
var subf = new IsoFolder();
subf.Name = ar[i].Trim();
f.entries[key] = subf;
}
IsoEntry e = f.entries[key];
if (e.IsFile)
{
throw new Exception("cannot create directory \"" + ar[i].Trim() + "\", a file by that Name already exists");
//return;
}
f = (IsoFolder)e;
}
var x = new IsoFile(fileInfo);
x.Name = ar[i].Trim();
key = ar[i].Trim().ToLower();
if (f.entries.ContainsKey(key))
{
//throw new Exception("file or folder by that Name already exists");
return (IsoFile)f.entries[key]; // just don't add it for now...
}
f.entries[key] = x;
return x;
}
