private bool ReadWoff2(Stream stream)
{
_woffVersion = WoffUtils.Woff2Version;
uint sizeRead = 0;
// 1. WOFF2Header: File header with basic font type and version, along with offsets
// to metadata and private data blocks.
_woffHeader = new WoffHeader(WoffUtils.Woff2Version);
_woffDirs = null;
sizeRead = _woffHeader.HeaderSize;
Debug.Assert(sizeRead == WoffUtils.Woff2HeaderSize);
if (!_woffHeader.Read(stream))
{
return(false);
}
// 2. TableDirectory: Directory of font tables, containing size and other info.
uint offset = 0;
_woffDirs = new List <WoffTableDirectory>(_woffHeader.NumTables);
for (ushort i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = new WoffTableDirectory(i, _woffVersion, offset);
if (woffDir.Read(stream, _woffHeader.IsTrueType))
{
if (woffDir.IsTransformed)
{
_isTransformed = true;
}
_woffDirs.Add(woffDir);
offset += woffDir.CompLength;
}
}
// 3. CollectionDirectory: An optional table containing the font fragment descriptions
// of font collection entries.
if (_woffHeader.IsCollection)
{
var isLoaded = this.ReadWoff2Fonts(stream);
}
else
{
var isLoaded = this.ReadWoff2Font(stream);
}
// 5. ExtendedMetadata: An optional block of extended metadata, represented in XML format
// and compressed for storage in the WOFF2 file.
_metadata = new WoffMetadata(_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 = WoffBuffer.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 = WoffBuffer.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 WoffPrivateData(_woffHeader.PrivateOffset, _woffHeader.PrivateLength);
if (_woffHeader.HasPrivateData)
{
stream.Seek(_woffHeader.PrivateOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.PrivateLength;
var privateBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_privateData.Data = privateBuffer;
}
return(true);
}
private bool ReadWoff1(Stream stream)
{
_woffVersion = WoffUtils.Woff1Version;
var woffFont = new WoffFont(_woffHeader);
_woffFonts.Add(woffFont);
woffFont.BeginDirectory(_woffVersion);
_woffHeader = new WoffHeader(WoffUtils.Woff1Version);
_woffDirs = null;
int sizeRead = 0;
sizeRead = _woffHeader.HeaderSize;
Debug.Assert(sizeRead == WoffUtils.Woff1HeaderSize);
if (!_woffHeader.Read(stream))
{
return(false);
}
_woffDirs = new List <WoffTableDirectory>(_woffHeader.NumTables);
// 2. TableDirectory: Directory of font tables, containing size and other info.
for (ushort i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = new WoffTableDirectory(i, _woffVersion);
if (woffDir.Read(stream))
{
_woffDirs.Add(woffDir);
woffFont.AddDirectory(woffDir);
}
}
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
stream.Seek(woffDir.Offset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)woffDir.CompLength;
if (bytesCount == 0)
{
continue;
}
var tableBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffDir.CompTable = tableBuffer;
if (woffDir.CompLength == woffDir.OrigLength)
{
// table data is not compressed
woffDir.OrigTable = tableBuffer;
}
else
{
bytesCount = (int)woffDir.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);
}
woffDir.OrigTable = origBuffer;
}
}
_metadata = new WoffMetadata(_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 = WoffBuffer.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 WoffPrivateData(_woffHeader.PrivateOffset, _woffHeader.PrivateLength);
if (_woffHeader.HasPrivateData)
{
stream.Seek(_woffHeader.PrivateOffset, SeekOrigin.Begin);
int bytesRead = 0;
int bytesCount = (int)_woffHeader.PrivateLength;
var privateBuffer = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
_privateData.Data = privateBuffer;
}
woffFont.EndDirectory();
return(true);
}
