private bool ImportWoff2(Stream stream)
{
int sizeRead = 0;
// 1. WOFF2Header: File header with basic font type and version, along with offsets
// to metadata and private data blocks.
_woffHeader = new SvgWoffHeader();
_woffTables = null;
var buffer = new byte[SvgWoffHeader.Woff2Size];
sizeRead = stream.Read(buffer, 0, (int)SvgWoffHeader.Woff2Size);
Debug.Assert(sizeRead == SvgWoffHeader.Woff2Size);
if (!_woffHeader.SetHeader(buffer))
{
return(false);
}
// 2. TableDirectory: Directory of font tables, containing size and other info.
_woffTables = new List <SvgWoffTableDirectory>(_woffHeader.NumTables);
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffTable = new SvgWoffTableDirectory();
if (woffTable.SetHeader(stream, _woffHeader.IsTrueType))
{
if (woffTable.IsTransformed)
{
_isTransformed = true;
}
_woffTables.Add(woffTable);
}
}
// 3. CollectionDirectory: An optional table containing the font fragment descriptions
// of font collection entries.
if (_woffHeader.IsCollection)
{
//TODO: WOFF2 - Font collection not yet supported
return(false);
}
// 4. CompressedFontData: Contents of font tables, compressed for storage in the WOFF2 file.
int bytesRead = 0;
int bytesCount = (int)_woffHeader.TotalCompressedSize;
if (bytesCount != 0)
{
byte[] compressedBuffer = SvgWoffObject.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
using (var brotliStream = new BrotliInputStream(new MemoryStream(compressedBuffer)))
{
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffTable = _woffTables[i];
bytesCount = (int)woffTable.TransformLength;
var tableBuffer = SvgWoffObject.ReadBytes(brotliStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffTable.CompTable = tableBuffer;
woffTable.OrigTable = tableBuffer;
if (!_isTransformed)
{
woffTable.OrigChecksum = woffTable.CalculateChecksum();
}
}
}
}
// 5. ExtendedMetadata: An optional block of extended metadata, represented in XML format
// and compressed for storage in the WOFF2 file.
_metadata = new SvgWoffMetadata(_woffHeader.MetaOffset,
_woffHeader.MetaLength, _woffHeader.MetaOrigLength);
if (_woffHeader.HasMetadata)
{
stream.Seek(_woffHeader.MetaOffset, SeekOrigin.Begin);
bytesRead = 0;
bytesCount = (int)_woffHeader.MetaLength;
var metaBuffer = SvgWoffObject.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_metadata.Data = metaBuffer;
_metadata.OrigData = metaBuffer;
if (_woffHeader.MetaLength != _woffHeader.MetaOrigLength)
{
bytesCount = (int)_woffHeader.MetaOrigLength;
using (var brotliStream = new BrotliInputStream(new MemoryStream(metaBuffer)))
{
var origBuffer = SvgWoffObject.ReadBytes(brotliStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_metadata.OrigData = origBuffer;
}
}
}
// 6. PrivateData: An optional block of private data for the font designer, foundry, or vendor to use.
_privateData = new SvgWoffPrivateData(_woffHeader.PrivateOffset, _woffHeader.PrivateLength);
if (_woffHeader.HasPrivateData)
{
stream.Seek(_woffHeader.PrivateOffset, SeekOrigin.Begin);
bytesRead = 0;
bytesCount = (int)_woffHeader.PrivateLength;
var privateBuffer = SvgWoffObject.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_privateData.Data = privateBuffer;
}
_woffVersion = 2;
// ((List<SvgWoffTableDirectory>)(_woffTables)).Sort(new WoffTableComparer());
return(true);
}
private bool ExportSingle(Stream stream)
{
if (stream == null || _woffHeader == null || _woffTables == null || _woffTables.Count == 0)
{
return(false);
}
var numTables = _woffHeader.NumTables;
var searchRange = (ushort)(SvgWoffObject.MaxPower2LE(numTables) * TableSize);
var entrySelector = SvgWoffObject.Log2(SvgWoffObject.MaxPower2LE(numTables));
var rangeShift = (ushort)(numTables * TableSize - searchRange);
int offset = 0;
// Write the font offset table...
var headerBuffer = new byte[HeaderSize];
// uint32: sfntVersion 0x00010000 or 0x4F54544F ('OTTO')
offset += SvgWoffObject.WriteUInt32BE(headerBuffer, offset, _woffHeader.Flavor);
// uint16: numTables Number of tables.
offset += SvgWoffObject.WriteUInt16BE(headerBuffer, offset, _woffHeader.NumTables);
// uint16 searchRange (Maximum power of 2 <= numTables) x 16.
offset += SvgWoffObject.WriteUInt16BE(headerBuffer, offset, searchRange);
// uint16: entrySelector Log2(maximum power of 2 <= numTables).
offset += SvgWoffObject.WriteUInt16BE(headerBuffer, offset, entrySelector);
// uint16: rangeShift NumTables x 16-searchRange.
offset += SvgWoffObject.WriteUInt16BE(headerBuffer, offset, rangeShift);
stream.Write(headerBuffer, 0, (int)HeaderSize);
uint tablesOffset = HeaderSize + numTables * TableSize;
var tableBuffer = new byte[TableSize];
for (int i = 0; i < numTables; i++)
{
offset = 0;
var woffTable = _woffTables[i];
// Tag: tableTag Table identifier.
offset += SvgWoffObject.WriteUInt32BE(tableBuffer, offset, woffTable.Tag);
// uint32: checkSum CheckSum for this table.
offset += SvgWoffObject.WriteUInt32BE(tableBuffer, offset, woffTable.OrigChecksum);
// Offset32 offset Offset from beginning of TrueType font file.
offset += SvgWoffObject.WriteUInt32BE(tableBuffer, offset, tablesOffset);
// uint32 length Length of this table.
offset += SvgWoffObject.WriteUInt32BE(tableBuffer, offset, woffTable.OrigLength);
stream.Write(tableBuffer, 0, (int)TableSize);
tablesOffset += woffTable.OrigLength;
if (tablesOffset % 4 != 0)
{
tablesOffset += 4 - (tablesOffset % 4);
}
}
var paddingBuffer = new byte[4];
for (int i = 0; i < numTables; i++)
{
var woffTable = _woffTables[i];
stream.Write(woffTable.OrigTable, 0, (int)woffTable.OrigLength);
stream.Write(paddingBuffer, 0, (int)woffTable.Padding);
}
return(true);
}
private bool ImportWoff1(Stream stream)
{
int sizeRead = 0;
_woffHeader = new SvgWoffHeader();
_woffTables = null;
var buffer = new byte[SvgWoffHeader.Woff1Size];
sizeRead = stream.Read(buffer, 0, (int)SvgWoffHeader.Woff1Size);
Debug.Assert(sizeRead == SvgWoffHeader.Woff1Size);
if (!_woffHeader.SetHeader(buffer))
{
return(false);
}
_woffTables = new List <SvgWoffTableDirectory>(_woffHeader.NumTables);
for (int i = 0; i < _woffHeader.NumTables; i++)
{
buffer = new byte[SvgWoffTableDirectory.Woff1Size];
sizeRead = stream.Read(buffer, 0, (int)SvgWoffTableDirectory.Woff1Size);
Debug.Assert(sizeRead == SvgWoffTableDirectory.Woff1Size);
var woffTable = new SvgWoffTableDirectory();
if (woffTable.SetHeader(buffer))
{
_woffTables.Add(woffTable);
}
}
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffTable = _woffTables[i];
stream.Seek(woffTable.Offset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)woffTable.CompLength;
if (bytesCount == 0)
{
continue;
}
var tableBuffer = SvgWoffObject.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffTable.CompTable = tableBuffer;
if (woffTable.CompLength == woffTable.OrigLength)
{
// table data is not compressed
woffTable.OrigTable = tableBuffer;
}
else
{
bytesCount = (int)woffTable.OrigLength;
var origBuffer = new byte[bytesCount];
using (var zlibStream = new ZLibStream(new MemoryStream(tableBuffer),
CompressionMode.Decompress, false))
{
int bytesStart = 0;
do
{
bytesRead = zlibStream.Read(origBuffer, bytesStart, bytesCount);
if (bytesRead == 0)
{
break;
}
bytesStart += bytesRead;
bytesCount -= bytesRead;
} while (bytesCount > 0);
}
woffTable.OrigTable = origBuffer;
}
}
_metadata = new SvgWoffMetadata(_woffHeader.MetaOffset, _woffHeader.MetaLength, _woffHeader.MetaOrigLength);
if (_woffHeader.HasMetadata)
{
stream.Seek(_woffHeader.MetaOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.MetaLength;
var metaBuffer = SvgWoffObject.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_metadata.Data = metaBuffer;
_metadata.OrigData = metaBuffer;
if (_woffHeader.MetaLength != _woffHeader.MetaOrigLength)
{
bytesCount = (int)_woffHeader.MetaOrigLength;
var origBuffer = new byte[bytesCount];
using (var zlibStream = new ZLibStream(new MemoryStream(metaBuffer),
CompressionMode.Decompress, false))
{
int bytesStart = 0;
do
{
bytesRead = zlibStream.Read(origBuffer, bytesStart, bytesCount);
if (bytesRead == 0)
{
break;
}
bytesStart += bytesRead;
bytesCount -= bytesRead;
} while (bytesCount > 0);
}
_metadata.OrigData = origBuffer;
}
}
_privateData = new SvgWoffPrivateData(_woffHeader.PrivateOffset, _woffHeader.PrivateLength);
if (_woffHeader.HasPrivateData)
{
stream.Seek(_woffHeader.PrivateOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.PrivateLength;
var privateBuffer = SvgWoffObject.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_privateData.Data = privateBuffer;
}
_woffVersion = 1;
return(true);
}