public DirectoryList Extract(Stream inputStream)
{
IndexedReader reader = new IndexedSeekingReader(inputStream);
var directory = new EpsDirectory();
var epsDirectories = new List <Directory>()
{
directory
};
// 0xC5D0D3C6 signifies an EPS Header block which contains 32-bytes of basic information
// 0x25215053 (%!PS) signifies an EPS File and leads straight into the PostScript
int startingPosition = (int)inputStream.Position;
switch (reader.GetInt32(0))
{
case unchecked ((int)0xC5D0D3C6):
reader = reader.WithByteOrder(isMotorolaByteOrder: false);
int postScriptOffset = reader.GetInt32(4);
int postScriptLength = reader.GetInt32(8);
int wmfOffset = reader.GetInt32(12);
int wmfSize = reader.GetInt32(16);
int tifOffset = reader.GetInt32(20);
int tifSize = reader.GetInt32(24);
//int checkSum = reader.getInt32(28);
// Get Tiff/WMF preview data if applicable
if (tifSize != 0)
{
directory.Set(EpsDirectory.TagTiffPreviewSize, tifSize);
directory.Set(EpsDirectory.TagTiffPreviewOffset, tifOffset);
// Get Tiff metadata
try
{
ByteArrayReader byteArrayReader = new(reader.GetBytes(tifOffset, tifSize));
TiffReader.ProcessTiff(byteArrayReader, new PhotoshopTiffHandler(epsDirectories));
}
catch (TiffProcessingException ex)
{
directory.AddError("Unable to process TIFF data: " + ex.Message);
}
}
else if (wmfSize != 0)
{
directory.Set(EpsDirectory.TagWmfPreviewSize, wmfSize);
directory.Set(EpsDirectory.TagWmfPreviewOffset, wmfOffset);
}
// TODO avoid allocating byte array here -- read directly from InputStream
Extract(directory, epsDirectories, new SequentialByteArrayReader(reader.GetBytes(postScriptOffset, postScriptLength)));
break;
case 0x25215053:
inputStream.Position = startingPosition;
Extract(directory, epsDirectories, new SequentialStreamReader(inputStream));
break;
default:
directory.AddError("File type not supported.");
break;
}
return(epsDirectories);
}