I'm currently writing a PDF reader and I have problems displaying text with embedded fonts.
I thought the font file stream of a Type 1 font would contain postscript with information how each individual glyph is displayed.
I tried to flatedecode the stream but the result was not readable and seemed to be nonsense.
private static byte[] DecodeFlateDecodeData(byte[] data)
{
MemoryStream outputStream;
using (outputStream = new MemoryStream())
{
using (var compressedDataStream = new MemoryStream(data))
{
// Remove the first two bytes to skip the header (it isn't recognized by the DeflateStream class)
compressedDataStream.ReadByte();
compressedDataStream.ReadByte();
var deflateStream = new DeflateStream(compressedDataStream, CompressionMode.Decompress, true);
var decompressedBuffer = new byte[1024];
int read;
while ((read = deflateStream.Read(decompressedBuffer, 0, decompressedBuffer.Length)) != 0)
{
outputStream.Write(decompressedBuffer, 0, read);
}
outputStream.Flush();
compressedDataStream.Close();
}
return outputStream.ToArray();
}
}
Source: Extract embedded PDF fonts to an external ttf file using some utility or script
I expected something like this
%!FontType1-1.0: Symbol 001.003
%%CreationDate: Thu Apr 16 1987
%%VMusage: 27647 34029
% Copyright (c) 1985, 1987 Adobe Systems
% Incorporated. All rights reserved.
11 dict begin
/FontInfo 8 dict dup begin
/version (001.003) readonly def
/FullName (Symbol) readonly def
/FamilyName (Symbol) readonly def
/Weight (Medium) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -98 def
/UnderlineThickness 54 def
end readonly def
/FontName /Symbol def
.
.
.
cleartomark
as seen in the Type 1 reference on page 11.
Or do I fundamentally misunderstand something here?
