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Temporary solution to read woff2
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ema
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//MIT, 2019-present, WinterDev
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//see https://www.w3.org/TR/2012/REC-WOFF-20121213/
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using System;
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using System.IO;
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using Typography.OpenFont.Tables;
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using Typography.OpenFont.Trimmable;
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namespace Typography.OpenFont.WebFont
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{
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//NOTE: Web Font file structure is not part of 'Open Font Format'.
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class WoffHeader
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{
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//WOFFHeader
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//UInt32 signature 0x774F4646 'wOFF'
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//UInt32 flavor The "sfnt version" of the input font.
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//UInt32 length Total size of the WOFF file.
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//UInt16 numTables Number of entries in directory of font tables.
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//UInt16 reserved Reserved; set to zero.
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//UInt32 totalSfntSize Total size needed for the uncompressed font data, including the sfnt header, directory, and font tables(including padding).
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//UInt16 majorVersion Major version of the WOFF file.
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//UInt16 minorVersion Minor version of the WOFF file.
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//UInt32 metaOffset Offset to metadata block, from beginning of WOFF file.
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//UInt32 metaLength Length of compressed metadata block.
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//UInt32 metaOrigLength Uncompressed size of metadata block.
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//UInt32 privOffset Offset to private data block, from beginning of WOFF file.
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//UInt32 privLength Length of private data block.
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public uint flavor;
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public uint length;
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public uint numTables;
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//public ushort reserved;
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public uint totalSfntSize;
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public ushort majorVersion;
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public ushort minorVersion;
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public uint metaOffset;
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public uint metaLength;
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public uint metaOriginalLength;
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public uint privOffset;
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public uint privLength;
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}
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class WoffTableDirectory
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{
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//WOFF TableDirectoryEntry
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//UInt32 tag 4-byte sfnt table identifier.
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//UInt32 offset Offset to the data, from beginning of WOFF file.
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//UInt32 compLength Length of the compressed data, excluding padding.
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//UInt32 origLength Length of the uncompressed table, excluding padding.
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//UInt32 origChecksum Checksum of the uncompressed table.
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public uint tag;
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public uint offset;
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public uint compLength;
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public uint origLength;
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public uint origChecksum;
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//translated values
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//public UnreadTableEntry unreadTableEntry; //simulate
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public string Name { get; set; }
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public long ExpectedStartAt { get; set; }
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#if DEBUG
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public WoffTableDirectory()
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{
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}
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public override string ToString()
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{
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return Name;
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}
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#endif
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}
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public delegate bool ZlibDecompressStreamFunc(byte[] compressedInput, byte[] decompressOutput);
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public static class WoffDefaultZlibDecompressFunc
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{
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public static ZlibDecompressStreamFunc DecompressHandler;
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}
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class WoffReader
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{
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private WoffHeader _header;
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public ZlibDecompressStreamFunc DecompressHandler;
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public PreviewFontInfo ReadPreview(BinaryReader reader)
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{
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//read preview only
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//WOFF File
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//WOFFHeader File header with basic font type and version, along with offsets to metadata and private data blocks.
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//TableDirectory Directory of font tables, indicating the original size, compressed size and location of each table within the WOFF file.
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//FontTables The font data tables from the input sfnt font, compressed to reduce bandwidth requirements.
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//ExtendedMetadata An optional block of extended metadata, represented in XML format and compressed for storage in the WOFF file.
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//PrivateData An optional block of private data for the font designer, foundry, or vendor to use.
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PreviewFontInfo fontPreviewInfo = null;
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_header = ReadWOFFHeader(reader);
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if (_header == null)
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{
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#if DEBUG
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System.Diagnostics.Debug.WriteLine("can't read ");
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#endif
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return null; //notify user too
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}
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//
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WoffTableDirectory[] woffTableDirs = ReadTableDirectories(reader);
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if (woffTableDirs == null)
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{
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return null;
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}
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//try read each compressed table
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if (DecompressHandler == null)
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{
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if (WoffDefaultZlibDecompressFunc.DecompressHandler != null)
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{
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DecompressHandler = WoffDefaultZlibDecompressFunc.DecompressHandler;
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}
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else
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{
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#if DEBUG
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System.Diagnostics.Debug.WriteLine("no Zlib DecompressHandler ");
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#endif
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return null; //notify user too
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}
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}
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TableEntryCollection tableEntryCollection = CreateTableEntryCollection(woffTableDirs);
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//for font preview, we may not need to extract
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using (MemoryStream decompressStream = new MemoryStream())
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{
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if (Extract(reader, woffTableDirs, decompressStream))
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{
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using (ByteOrderSwappingBinaryReader reader2 = new ByteOrderSwappingBinaryReader(decompressStream))
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{
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decompressStream.Position = 0;
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OpenFontReader openFontReader = new OpenFontReader();
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PreviewFontInfo previewFontInfo = openFontReader.ReadPreviewFontInfo(tableEntryCollection, reader2);
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if (previewFontInfo != null)
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{
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//add webfont info to this preview font
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previewFontInfo.IsWebFont = true;
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}
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return previewFontInfo;
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}
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}
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}
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return fontPreviewInfo;
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}
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internal bool Read(Typeface typeface, BinaryReader reader, RestoreTicket ticket)
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{
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//WOFF File
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//WOFFHeader File header with basic font type and version, along with offsets to metadata and private data blocks.
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//TableDirectory Directory of font tables, indicating the original size, compressed size and location of each table within the WOFF file.
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//FontTables The font data tables from the input sfnt font, compressed to reduce bandwidth requirements.
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//ExtendedMetadata An optional block of extended metadata, represented in XML format and compressed for storage in the WOFF file.
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//PrivateData An optional block of private data for the font designer, foundry, or vendor to use.
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_header = ReadWOFFHeader(reader);
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if (_header == null)
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{
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#if DEBUG
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System.Diagnostics.Debug.WriteLine("can't read ");
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#endif
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return false;
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}
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//
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WoffTableDirectory[] woffTableDirs = ReadTableDirectories(reader);
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if (woffTableDirs == null)
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{
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return false;
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}
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//
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//try read each compressed table
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if (DecompressHandler == null)
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{
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if (WoffDefaultZlibDecompressFunc.DecompressHandler != null)
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{
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DecompressHandler = WoffDefaultZlibDecompressFunc.DecompressHandler;
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}
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else
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{
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#if DEBUG
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System.Diagnostics.Debug.WriteLine("no Zlib DecompressHandler ");
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#endif
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return false;
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}
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}
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TableEntryCollection tableEntryCollection = CreateTableEntryCollection(woffTableDirs);
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using (MemoryStream decompressStream = new MemoryStream())
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{
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if (Extract(reader, woffTableDirs, decompressStream))
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{
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using (ByteOrderSwappingBinaryReader reader2 = new ByteOrderSwappingBinaryReader(decompressStream))
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{
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decompressStream.Position = 0;
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OpenFontReader openFontReader = new OpenFontReader();
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return openFontReader.ReadTableEntryCollection(typeface, ticket, tableEntryCollection, reader2);
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}
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}
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}
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return false;
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}
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static TableEntryCollection CreateTableEntryCollection(WoffTableDirectory[] woffTableDirs)
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{
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TableEntryCollection tableEntryCollection = new TableEntryCollection();
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for (int i = 0; i < woffTableDirs.Length; ++i)
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{
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WoffTableDirectory woffTableDir = woffTableDirs[i];
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tableEntryCollection.AddEntry(
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new UnreadTableEntry(
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new TableHeader(woffTableDir.tag,
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woffTableDir.origChecksum,
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(uint)woffTableDir.ExpectedStartAt,
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woffTableDir.origLength)));
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}
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return tableEntryCollection;
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}
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static WoffHeader ReadWOFFHeader(BinaryReader reader)
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{
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//WOFFHeader
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//UInt32 signature 0x774F4646 'wOFF'
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//UInt32 flavor The "sfnt version" of the input font.
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//UInt32 length Total size of the WOFF file.
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//UInt16 numTables Number of entries in directory of font tables.
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//UInt16 reserved Reserved; set to zero.
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//UInt32 totalSfntSize Total size needed for the uncompressed font data, including the sfnt header, directory, and font tables(including padding).
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//UInt16 majorVersion Major version of the WOFF file.
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//UInt16 minorVersion Minor version of the WOFF file.
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//UInt32 metaOffset Offset to metadata block, from beginning of WOFF file.
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//UInt32 metaLength Length of compressed metadata block.
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//UInt32 metaOrigLength Uncompressed size of metadata block.
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//UInt32 privOffset Offset to private data block, from beginning of WOFF file.
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//UInt32 privLength Length of private data block.
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//signature
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byte b0 = reader.ReadByte();
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byte b1 = reader.ReadByte();
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byte b2 = reader.ReadByte();
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byte b3 = reader.ReadByte();
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if (!(b0 == 0x77 && b1 == 0x4f && b2 == 0x46 && b3 == 0x46))
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{
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return null;
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}
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WoffHeader header = new WoffHeader();
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header.flavor = reader.ReadUInt32BE();
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header.length = reader.ReadUInt32BE();
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header.numTables = reader.ReadUInt16BE();
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ushort reserved = reader.ReadUInt16BE();
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header.totalSfntSize = reader.ReadUInt32BE();
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header.majorVersion = reader.ReadUInt16BE();
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header.minorVersion = reader.ReadUInt16BE();
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header.metaOffset = reader.ReadUInt32BE();
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header.metaLength = reader.ReadUInt32BE();
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header.metaOriginalLength = reader.ReadUInt32BE();
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header.privOffset = reader.ReadUInt32BE();
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header.privLength = reader.ReadUInt32BE();
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return header;
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}
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WoffTableDirectory[] ReadTableDirectories(BinaryReader reader)
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{
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//The table directory is an array of WOFF table directory entries, as defined below.
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//The directory follows immediately after the WOFF file header;
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//therefore, there is no explicit offset in the header pointing to this block.
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//Its size is calculated by multiplying the numTables value in the WOFF header times the size of a single WOFF table directory.
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//Each table directory entry specifies the size and location of a single font data table.
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uint tableCount = (uint)_header.numTables; //?
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//tableDirs = new WoffTableDirectory[tableCount];
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long expectedStartAt = 0;
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//simulate table entry collection
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//var tableEntryCollection = new TableEntryCollection((int)tableCount);
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WoffTableDirectory[] tableDirs = new WoffTableDirectory[tableCount];
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for (int i = 0; i < tableCount; ++i)
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{
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//UInt32 tag 4-byte sfnt table identifier.
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//UInt32 offset Offset to the data, from beginning of WOFF file.
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//UInt32 compLength Length of the compressed data, excluding padding.
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//UInt32 origLength Length of the uncompressed table, excluding padding.
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//UInt32 origChecksum Checksum of the uncompressed table.
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WoffTableDirectory table = new WoffTableDirectory();
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table.tag = reader.ReadUInt32();
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table.offset = reader.ReadUInt32();
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table.compLength = reader.ReadUInt32();
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table.origLength = reader.ReadUInt32();
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table.origChecksum = reader.ReadUInt32();
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table.ExpectedStartAt = expectedStartAt;
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table.Name = Utils.TagToString(table.tag);
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//var tableHeader = new TableHeader(tag, origChecksum, (uint)expectedStartAt, origLength);
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//var unreadTable = new UnreadTableEntry(tableHeader);
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//tableEntryCollection.AddEntry(unreadTable);
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//table.unreadTableEntry = unreadTable;
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tableDirs[i] = table;
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expectedStartAt += table.origLength;
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}
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return tableDirs;
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}
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bool Extract(BinaryReader reader, WoffTableDirectory[] tables, Stream newDecompressedStream)
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{
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for (int i = 0; i < tables.Length; ++i)
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{
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//UInt32 tag 4-byte sfnt table identifier.
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//UInt32 offset Offset to the data, from beginning of WOFF file.
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//UInt32 compLength Length of the compressed data, excluding padding.
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//UInt32 origLength Length of the uncompressed table, excluding padding.
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//UInt32 origChecksum Checksum of the uncompressed table.
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WoffTableDirectory table = tables[i];
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reader.BaseStream.Seek(table.offset, SeekOrigin.Begin);
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//indeed, table may be compress or not=> check length of before and after ...
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byte[] compressedBuffer = reader.ReadBytes((int)table.compLength);
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if (compressedBuffer.Length == table.origLength)
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{
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//not a compress buffer
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newDecompressedStream.Write(compressedBuffer, 0, compressedBuffer.Length);
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}
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else
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{
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var decompressedBuffer = new byte[table.origLength];
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if (!DecompressHandler(compressedBuffer, decompressedBuffer))
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{
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//if not pass set to null
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decompressedBuffer = null;
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}
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else
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{
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//pass
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newDecompressedStream.Write(decompressedBuffer, 0, decompressedBuffer.Length);
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}
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}
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}
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newDecompressedStream.Flush();
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return true;
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}
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}
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}
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