internal Typeface Read(BinaryReader reader)
{
//WOFF File
//WOFFHeader File header with basic font type and version, along with offsets to metadata and private data blocks.
//TableDirectory Directory of font tables, indicating the original size, compressed size and location of each table within the WOFF file.
//FontTables The font data tables from the input sfnt font, compressed to reduce bandwidth requirements.
//ExtendedMetadata An optional block of extended metadata, represented in XML format and compressed for storage in the WOFF file.
//PrivateData An optional block of private data for the font designer, foundry, or vendor to use.
_header = ReadWOFFHeader(reader);
if (_header == null)
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("can't read ");
#endif
return(null); //notify user too
}
//
WoffTableDirectory[] woffTableDirs = ReadTableDirectories(reader);
if (woffTableDirs == null)
{
return(null);
}
//
//try read each compressed table
if (DecompressHandler == null)
{
if (WoffDefaultZlibDecompressFunc.DecompressHandler != null)
{
DecompressHandler = WoffDefaultZlibDecompressFunc.DecompressHandler;
}
else
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("no Zlib DecompressHandler ");
#endif
return(null); //notify user too
}
}
TableEntryCollection tableEntryCollection = CreateTableEntryCollection(woffTableDirs);
using (MemoryStream decompressStream = new MemoryStream())
{
if (Extract(reader, woffTableDirs, decompressStream))
{
using (ByteOrderSwappingBinaryReader reader2 = new ByteOrderSwappingBinaryReader(decompressStream))
{
decompressStream.Position = 0;
OpenFontReader openFontReader = new OpenFontReader();
return(openFontReader.ReadTableEntryCollection(tableEntryCollection, reader2));
}
}
}
return(null);
}
static WoffHeader ReadWOFFHeader(BinaryReader reader)
{
//WOFFHeader
//UInt32 signature 0x774F4646 'wOFF'
//UInt32 flavor The "sfnt version" of the input font.
//UInt32 length Total size of the WOFF file.
//UInt16 numTables Number of entries in directory of font tables.
//UInt16 reserved Reserved; set to zero.
//UInt32 totalSfntSize Total size needed for the uncompressed font data, including the sfnt header, directory, and font tables(including padding).
//UInt16 majorVersion Major version of the WOFF file.
//UInt16 minorVersion Minor version of the WOFF file.
//UInt32 metaOffset Offset to metadata block, from beginning of WOFF file.
//UInt32 metaLength Length of compressed metadata block.
//UInt32 metaOrigLength Uncompressed size of metadata block.
//UInt32 privOffset Offset to private data block, from beginning of WOFF file.
//UInt32 privLength Length of private data block.
//signature
byte b0 = reader.ReadByte();
byte b1 = reader.ReadByte();
byte b2 = reader.ReadByte();
byte b3 = reader.ReadByte();
if (!(b0 == 0x77 && b1 == 0x4f && b2 == 0x46 && b3 == 0x46))
{
return(null);
}
WoffHeader header = new WoffHeader();
header.flavor = reader.ReadUInt32();
header.length = reader.ReadUInt32();
header.numTables = reader.ReadUInt16();
ushort reserved = reader.ReadUInt16();
header.totalSfntSize = reader.ReadUInt32();
header.majorVersion = reader.ReadUInt16();
header.minorVersion = reader.ReadUInt16();
header.metaOffset = reader.ReadUInt32();
header.metaLength = reader.ReadUInt32();
header.metaOriginalLength = reader.ReadUInt32();
header.privOffset = reader.ReadUInt32();
header.privLength = reader.ReadUInt32();
return(header);
}
