public byte[] Rebuild(bool checksumAdjustment)
{
// create a Motorola Byte Order buffer for the new table
WoffBuffer headBuffer = new WoffBuffer(SizeOfTable);
// populate the buffer
headBuffer.SetFixed(this.TableVersionNumber, (uint)FieldOffsets.TableVersionNumber);
headBuffer.SetFixed(this.FontRevision, (uint)FieldOffsets.FontRevision);
headBuffer.SetUInt(this.CheckSumAdjustment, (uint)FieldOffsets.CheckSumAdjustment);
headBuffer.SetUInt(this.MagicNumber, (uint)FieldOffsets.MagicNumber);
headBuffer.SetUShort(this.Flags, (uint)FieldOffsets.Flags);
headBuffer.SetUShort(this.UnitsPerEm, (uint)FieldOffsets.UnitsPerEm);
headBuffer.SetLong(this.Created, (uint)FieldOffsets.Created);
headBuffer.SetLong(this.Modified, (uint)FieldOffsets.Modified);
headBuffer.SetShort(this.XMin, (uint)FieldOffsets.XMin);
headBuffer.SetShort(this.YMin, (uint)FieldOffsets.YMin);
headBuffer.SetShort(this.XMax, (uint)FieldOffsets.XMax);
headBuffer.SetShort(this.YMax, (uint)FieldOffsets.YMax);
headBuffer.SetUShort(this.MacStyle, (uint)FieldOffsets.MacStyle);
headBuffer.SetUShort(this.LowestRecPPEM, (uint)FieldOffsets.LowestRecPPEM);
headBuffer.SetShort(this.FontDirectionHint, (uint)FieldOffsets.FontDirectionHint);
headBuffer.SetShort(this.IndexToLocFormat, (uint)FieldOffsets.IndexToLocFormat);
headBuffer.SetShort(this.GlyphDataFormat, (uint)FieldOffsets.GlyphDataFormat);
if (checksumAdjustment)
{
// For checksum adjustment, we set this value to 0
headBuffer.SetUInt(0, (uint)FieldOffsets.CheckSumAdjustment);
}
return(headBuffer.GetBuffer());
}
public bool Read(Stream stream, int directoryCount)
{
int bytesRead = 0;
this.NumTables = WoffBuffer.Read255UInt16(stream);
if (this.NumTables == 0)
{
return(false);
}
this.Flavor = WoffBuffer.ReadUInt32BE(WoffBuffer.ReadBytes(stream, WoffBuffer.SizeOfUInt, out bytesRead), 0);
this.TableIndices = new ushort[this.NumTables];
for (ushort i = 0; i < this.NumTables; i++)
{
this.TableIndices[i] = WoffBuffer.Read255UInt16(stream);
if (this.TableIndices[i] >= directoryCount)
{
Trace.TraceError("Invalid collection font entry: " + this.TableIndices[i]);
return(false);
}
}
return(true);
}
public NameRecord Clone()
{
ushort offset = 0;
WoffBuffer bufTable = new WoffBuffer(SizeOf);
NameRecord cloned = new NameRecord(offset, bufTable);
cloned.PlatformID = this.PlatformID;
cloned.EncodingID = this.EncodingID;
cloned.LanguageID = this.LanguageID;
cloned.NameID = this.NameID;
cloned.StringLength = this.StringLength;
cloned.StringOffset = this.StringOffset;
if (_nameBytes != null)
{
byte[] nameBytes = new byte[_nameBytes.Length];
Buffer.BlockCopy(_nameBytes, 0, nameBytes, 0, _nameBytes.Length);
cloned.NameBytes = nameBytes;
}
if (_nameString != null)
{
cloned.NameString = new string(_nameString.ToCharArray());
}
return(cloned);
}
/// <summary>
/// Initializes a new non-resizable instance of the <see cref="WoffWriter"/> class
/// based on the specified region (index) of a byte array.
/// </summary>
/// <param name="buffer">The array of unsigned bytes from which to create this stream.</param>
/// <param name="index">The index into buffer at which the stream begins.</param>
/// <param name="count">The length of the stream in bytes.</param>
public WoffWriter(byte[] buffer, int index, int count)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer), "ArgumentNull_Buffer");
}
if (index < 0)
{
throw new ArgumentOutOfRangeException(nameof(index), "ArgumentOutOfRange_NeedNonNegNum");
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count), "ArgumentOutOfRange_NeedNonNegNum");
}
if (buffer.Length - index < count)
{
throw new ArgumentException("Argument_InvalidOffLen");
}
_converter = new WoffBuffer(WoffBuffer.SizeOfLong * 2); // 16-bytes
if (buffer.Length == 0)
{
_buffer = new MemoryStream();
_isExpandable = true;
}
else
{
_buffer = new MemoryStream(buffer, index, count, true, true);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WoffReader"/> class with the specified bytes stream.
/// </summary>
/// <param name="buffer">A object containing the bytes stream.</param>
public WoffReader(byte[] buffer)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer), "The buffer parameter is required and cannot be null.");
}
_buffer = new WoffBuffer(buffer);
}
public void ChecksumAdjustment(byte[] headersBuffer, uint headerOffset, uint headerLength, uint tablesChecksum = 0)
{
Debug.Assert(_headIndex != -1);
if (_headIndex == -1)
{
return;
}
var headTable = _woffTables[_headIndex] as WoffTableHead;
Debug.Assert(headTable != null);
if (headTable == null)
{
return;
}
// Compute the checksum of the font's header
Debug.Assert(headerLength != 0);
Debug.Assert(headersBuffer != null && headersBuffer.Length != 0);
var headerPadding = (uint)WoffBuffer.CalcPadBytes((int)headerLength, 4);
var buffer = headersBuffer;
if (headerPadding > 0)
{
var paddedLength = headerLength + headerPadding;
buffer = new byte[paddedLength];
Buffer.BlockCopy(headersBuffer, 0, buffer, 0, headersBuffer.Length);
}
uint nLongs = (headerLength + 3) / 4;
uint headerChecksum = 0;
for (uint i = 0; i < nLongs; i += 4)
{
headerChecksum += WoffBuffer.GetUIntBE(buffer, i);
}
// Compute the checksum of the font by summing the checksum of the header and tables
var fontChecksum = headerChecksum;
if (tablesChecksum == 0)
{
tablesChecksum = headerChecksum;
for (ushort i = 0; i < _woffDirs.Count; i++)
{
tablesChecksum += _woffDirs[i].OrigChecksum;
}
}
fontChecksum += headerChecksum;
// Finally, update the 'head' table's checkSumAdjustment.
headTable.CheckSumAdjustment = 0xB1B0AFBA - fontChecksum;
}
public WoffTableHead(WoffFont woffFont, WoffTableDirectory woffDir)
: base(woffFont, woffDir)
{
var buffer = woffDir.OrigTable;
if (buffer != null && buffer.Length >= SizeOfTable)
{
var length = buffer.Length;
_tableBuffer = new WoffBuffer((uint)length);
_tableBuffer.Copy(buffer);
}
}
public WoffTableName(WoffFont woffFont, WoffTableDirectory woffDir)
: base(woffFont, woffDir)
{
var buffer = woffDir.OrigTable;
if (buffer != null && buffer.Length >= 6)
{
var length = buffer.Length;
_tableBuffer = new WoffBuffer((uint)length);
_tableBuffer.Copy(buffer);
}
_unicodeNoBOM = new UnicodeEncoding(true, false);
}
public bool Read(Stream stream)
{
int bytesRead = 0;
this.Version = WoffBuffer.ReadUInt32BE(WoffBuffer.ReadBytes(stream,
WoffBuffer.SizeOfUInt, out bytesRead), 0);
this.NumFonts = WoffBuffer.Read255UInt16(stream);
if (this.Version == 0x00010000 || this.Version == 0x00020000)
{
TtcTag = WoffUtils.TtcSignature;
this.MajorVersion = (ushort)(this.Version == 0x00010000 ? 1 : 2);
return(true);
}
return(false);
}
/// Initializes a new non-resizable instance of the <see cref="WoffWriter"/> class
/// based on the specified byte array.
/// </summary>
/// <param name="buffer">The array of unsigned bytes from which to create the current stream.</param>
public WoffWriter(byte[] buffer)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer), "ArgumentNull_Buffer");
}
_converter = new WoffBuffer(WoffBuffer.SizeOfLong * 2); // 16-bytes
if (buffer.Length == 0)
{
_buffer = new MemoryStream();
_isExpandable = true;
}
else
{
_buffer = new MemoryStream(buffer, 0, buffer.Length, true, true);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WoffWriter"/> class with a non-resizable
/// capacity initialized as specified.
/// </summary>
/// <param name="capacity">The initial size of the internal array in bytes.</param>
public WoffWriter(uint capacity)
{
if (capacity < 0)
{
throw new ArgumentOutOfRangeException(nameof(capacity));
}
_converter = new WoffBuffer(WoffBuffer.SizeOfLong * 2); // 16-bytes
if (capacity == 0)
{
_buffer = new MemoryStream();
_isExpandable = true;
}
else
{
_buffer = new MemoryStream(new byte[capacity], 0, (int)capacity, true, true);
}
}
protected override bool ReconstructTable()
{
var headBuffer = _woffDir.OrigTable;
if (headBuffer == null || headBuffer.Length < SizeOfTable)
{
return(false);
}
var length = headBuffer.Length;
_tableBuffer = new WoffBuffer((uint)length);
_tableBuffer.Copy(headBuffer);
// For checksum adjustment, we set this value to 0
_tableBuffer.SetUInt(0, (uint)FieldOffsets.CheckSumAdjustment);
_woffDir.OrigTable = headBuffer;
_woffDir.OrigLength = (uint)headBuffer.Length;
return(true);
}
private bool SerializeHmtx(IList <ushort> advanceWidths, IList <short> lsbs, int numOfHMetrics, int numOfGlyphs)
{
var hmtxBufferSize = 2 * numOfGlyphs + 2 * numOfHMetrics;
var writer = new WoffWriter(hmtxBufferSize);
for (int i = 0; i < numOfGlyphs; i++)
{
if (i < numOfHMetrics)
{
writer.WriteUInt16(advanceWidths[i]);
}
writer.WriteInt16(lsbs[i]);
}
var tableBuffer = writer.GetBuffer();
var hmtxBuffer = new WoffBuffer(tableBuffer);
_woffDir.OrigTable = tableBuffer;
_woffDir.OrigLength = (uint)tableBuffer.Length;
return(true);
}
private bool ReadData(Stream stream)
{
if (stream == null)
{
return(false);
}
int bytesRead = 0;
byte[] header = WoffBuffer.ReadBytes(stream, WoffUtils.Woff1DirSize, out bytesRead);
_tag = WoffBuffer.ReadUInt32BE(header, 0);
_offset = WoffBuffer.ReadUInt32BE(header, 4);
_compLength = WoffBuffer.ReadUInt32BE(header, 8);
_origLength = WoffBuffer.ReadUInt32BE(header, 12);
_origChecksum = WoffBuffer.ReadUInt32BE(header, 16);
if (_origLength > 0)
{
_padding = WoffUtils.CalculatePadding(_origLength);
}
return(true);
}
public uint CalculateChecksum()
{
Debug.Assert(_origLength != 0);
Debug.Assert(_origTable != null && _origTable.Length != 0);
var padBytesLength = (uint)WoffBuffer.CalcPadBytes((int)_origLength, 4);
if (padBytesLength != 0)
{
_padding = padBytesLength;
}
var origLength = _origLength;
var buffer = _origTable;
if (_padding > 0)
{
origLength = _origLength + _padding;
buffer = new byte[origLength];
Buffer.BlockCopy(_origTable, 0, buffer, 0, _origTable.Length);
}
uint nLongs = (_origLength + 3) / 4;
uint sum = 0;
//for (uint i = 0; i < nLongs; i++)
//{
// sum += WoffBuffer.GetUIntBE(buffer, i * 4);
//}
for (uint i = 0; i < nLongs; i += 4)
{
sum += WoffBuffer.GetUIntBE(buffer, i);
}
return(sum);
}
public static bool BinaryEqual(WoffBuffer buf1, WoffBuffer buf2)
{
bool bEqual = true;
if (buf1.GetLength() != buf2.GetLength())
{
bEqual = false;
}
else
{
byte[] b1 = buf1.GetBuffer();
byte[] b2 = buf2.GetBuffer();
for (int i = 0; i < b1.Length; i++)
{
if (b1[i] != b2[i])
{
bEqual = false;
break;
}
}
}
return(bEqual);
}
/// <summary>
/// Initializes a new instance of the <see cref="WoffWriter"/> class with an expandable
/// capacity initialized to zero.
/// </summary>
public WoffWriter()
{
_buffer = new MemoryStream();
_converter = new WoffBuffer(WoffBuffer.SizeOfLong * 2); // 16-bytes
_isExpandable = 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);
}
public NameRecord(ushort offset, WoffBuffer bufTable)
{
_offsetNameRecord = offset;
_tableBuffer = bufTable;
}
protected override bool ReconstructTable()
{
var headBuffer = _woffDir.OrigTable;
if (headBuffer == null || headBuffer.Length < 6)
{
return(false);
}
var length = headBuffer.Length;
_tableBuffer = new WoffBuffer((uint)length);
_tableBuffer.Copy(headBuffer);
var fullFontName = this.GetNameString();
var fontFamilyName = this.GetFamilyString();
var postScriptName = this.GetPostScriptString();
// Check if the FullFontName and FontFamilyName are stripped from the compressed table data
// Some tools (such as the dvisvgm – A fast DVI to SVG converter) strip both leaving only the PostScriptName
if (!string.IsNullOrWhiteSpace(fullFontName) && !string.IsNullOrWhiteSpace(fontFamilyName))
{
return(true);
}
var fixFullFontName = string.IsNullOrWhiteSpace(fullFontName);
var fixFontFamilyName = string.IsNullOrWhiteSpace(fontFamilyName);
// For the fix, we will just duplicate an existing name record, find out which one.
ushort searchRecord = 0;
if (!fixFullFontName)
{
searchRecord = (ushort)NameIdentifiers.FullFontName;
}
else if (!fixFontFamilyName)
{
searchRecord = (ushort)NameIdentifiers.FontFamilyName;
}
else if (!string.IsNullOrWhiteSpace(postScriptName))
{
searchRecord = (ushort)NameIdentifiers.PostScriptName;
}
else
{
// We cannot fix it...
return(true);
}
int numRecords = this.NumberNameRecords;
List <NameRecord> nameRecords = new List <NameRecord>(numRecords);
for (uint i = 0; i < numRecords; i++)
{
NameRecord nr = GetNameRecord(i);
if (nr != null)
{
byte[] nameBytes = GetEncodedString(nr);
if (nameBytes != null && nameBytes.Length != 0)
{
nr.NameBytes = nameBytes;
nr.NameString = DecodeString(nr.PlatformID, nr.EncodingID, nameBytes);
nameRecords.Add(nr);
if (searchRecord == nr.NameID)
{
if (fixFontFamilyName)
{
var nrFontFamily = nr.Clone();
nrFontFamily.NameID = (ushort)NameIdentifiers.FontFamilyName;
nameRecords.Add(nrFontFamily);
}
if (fixFullFontName)
{
var nrFullFont = nr.Clone();
nrFullFont.NameID = (ushort)NameIdentifiers.FullFontName;
nameRecords.Add(nrFullFont);
}
}
}
}
}
numRecords = nameRecords.Count;
List <byte[]> bytesNameString = new List <byte[]>();
uint lengthOfStrings = 0;
ushort offsetToStrings = (ushort)(6 + (numRecords * 12));
for (int i = 0; i < numRecords; i++)
{
var nrc = nameRecords[i];
byte[] byteString = nrc.NameBytes;
bytesNameString.Add(byteString);
lengthOfStrings += (ushort)byteString.Length;
}
// create a Motorola Byte Order buffer for the new table
var tableBuffer = new WoffBuffer((uint)((ushort)FieldOffsets.NameRecords + numRecords * 12 + lengthOfStrings));
// populate the buffer
tableBuffer.SetUShort(this.FormatSelector, (uint)FieldOffsets.FormatSelector);
tableBuffer.SetUShort((ushort)numRecords, (uint)FieldOffsets.NumberNameRecords);
tableBuffer.SetUShort(offsetToStrings, (uint)FieldOffsets.OffsetToStrings);
ushort nOffset = 0;
// Write the NameRecords and Strings
for (int i = 0; i < numRecords; i++)
{
byte[] namBytes = bytesNameString[i];
uint startOffset = (uint)((ushort)(FieldOffsets.NameRecords) + i * NameRecord.SizeOf);
tableBuffer.SetUShort((nameRecords[i]).PlatformID, startOffset + (ushort)NameRecord.FieldOffsets.PlatformID);
tableBuffer.SetUShort((nameRecords[i]).EncodingID, startOffset + (ushort)NameRecord.FieldOffsets.EncodingID);
tableBuffer.SetUShort((nameRecords[i]).LanguageID, startOffset + (ushort)NameRecord.FieldOffsets.LanguageID);
tableBuffer.SetUShort((nameRecords[i]).NameID, startOffset + (ushort)NameRecord.FieldOffsets.NameID);
tableBuffer.SetUShort((ushort)namBytes.Length, startOffset + (ushort)NameRecord.FieldOffsets.StringLength);
tableBuffer.SetUShort(nOffset, startOffset + (ushort)NameRecord.FieldOffsets.StringOffset);
//Write the string to the buffer
for (int j = 0; j < namBytes.Length; j++)
{
tableBuffer.SetByte(namBytes[j], (uint)(offsetToStrings + nOffset + j));
}
nOffset += (ushort)namBytes.Length;
}
_tableBuffer = tableBuffer;
var nameBuffer = _tableBuffer.GetBuffer();
_woffDir.OrigTable = nameBuffer;
_woffDir.OrigLength = (uint)nameBuffer.Length;
_woffDir.RecalculateChecksum();
return(true);
}
private bool WriteWoff1(Stream stream)
{
if (stream == null || _woffHeader == null || _woffDirs == null || _woffDirs.Count == 0)
{
return(false);
}
var numTables = _woffHeader.NumTables;
var searchRange = (ushort)(WoffUtils.MaxPower2LE(numTables) * TableSize);
var entrySelector = WoffUtils.Log2(WoffUtils.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 += WoffBuffer.WriteUInt32BE(headerBuffer, offset, _woffHeader.Flavor);
// uint16: numTables Number of tables.
offset += WoffBuffer.WriteUInt16BE(headerBuffer, offset, _woffHeader.NumTables);
// uint16 searchRange (Maximum power of 2 <= numTables) x 16.
offset += WoffBuffer.WriteUInt16BE(headerBuffer, offset, searchRange);
// uint16: entrySelector Log2(maximum power of 2 <= numTables).
offset += WoffBuffer.WriteUInt16BE(headerBuffer, offset, entrySelector);
// uint16: rangeShift NumTables x 16-searchRange.
offset += WoffBuffer.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 woffDir = _woffDirs[i];
// Tag: tableTag Table identifier.
offset += WoffBuffer.WriteUInt32BE(tableBuffer, offset, woffDir.Tag);
// uint32: checkSum CheckSum for this table.
offset += WoffBuffer.WriteUInt32BE(tableBuffer, offset, woffDir.OrigChecksum);
// Offset32 offset Offset from beginning of TrueType font file.
offset += WoffBuffer.WriteUInt32BE(tableBuffer, offset, tablesOffset);
// uint32 length Length of this table.
offset += WoffBuffer.WriteUInt32BE(tableBuffer, offset, woffDir.OrigLength);
stream.Write(tableBuffer, 0, (int)TableSize);
tablesOffset += woffDir.OrigLength;
if (tablesOffset % 4 != 0)
{
tablesOffset += 4 - (tablesOffset % 4);
}
}
var paddingBuffer = new byte[4];
for (int i = 0; i < numTables; i++)
{
var woffDir = _woffDirs[i];
stream.Write(woffDir.OrigTable, 0, (int)woffDir.OrigLength);
stream.Write(paddingBuffer, 0, (int)woffDir.Padding);
}
return(true);
}
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 ReadWoff2Font(Stream stream)
{
var woffFont = new WoffFont(_woffHeader);
_woffFonts.Add(woffFont);
woffFont.BeginDirectory(_woffVersion);
// 2. TableDirectory: Directory of font tables, containing size and other info.
for (ushort i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
woffFont.AddDirectory(woffDir);
}
// 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 = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
bool errorOccurred = false;
var memoryStream = new MemoryStream(compressedBuffer);
using (var brotliStream = new BrotliInputStream(memoryStream))
{
var decompressedStream = new MemoryStream();
brotliStream.CopyTo(decompressedStream);
decompressedStream.Seek(0, SeekOrigin.Begin);
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
try
{
// bytesCount = (int)woffDir.TransformLength;
bytesCount = (int)woffDir.CompLength;
decompressedStream.Seek(woffDir.Offset, SeekOrigin.Begin);
var tableBuffer = WoffBuffer.ReadBytes(decompressedStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffDir.CompTable = tableBuffer;
woffDir.OrigTable = tableBuffer;
}
catch (Exception ex)
{
errorOccurred = true;
Trace.TraceError(ex.Message);
}
}
}
if (errorOccurred)
{
return(false);
}
}
woffFont.EndDirectory();
return(true);
}
private bool ReadWoff2Fonts(Stream stream)
{
// 1. Read the collection font header
_collectionHeader = new CollectionHeader();
if (_collectionHeader.Read(stream) == false)
{
Trace.TraceError("Collection Font Error: Reading of collection header failed.");
return(false);
}
// 2. Read this collection font entries
var numFonts = _collectionHeader.NumFonts;
_collectionEntries = new List <CollectionFontEntry>(numFonts);
for (ushort i = 0; i < numFonts; i++)
{
var collectionEntry = new CollectionFontEntry(i);
if (collectionEntry.Read(stream, _woffDirs.Count) == false)
{
return(false);
}
_collectionEntries.Add(collectionEntry);
}
// 3. TableDirectory: Directory of font tables, containing size and other info.
for (ushort i = 0; i < numFonts; i++)
{
var collectionEntry = _collectionEntries[i];
var woffFont = new WoffFont(_woffHeader, _collectionHeader, collectionEntry);
_woffFonts.Add(woffFont);
woffFont.BeginDirectory(_woffVersion);
for (ushort j = 0; j < collectionEntry.NumTables; j++)
{
var index = collectionEntry.TableIndices[j];
var woffDir = _woffDirs[index];
woffFont.AddDirectory(woffDir);
}
}
// 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 = WoffBuffer.ReadBytes(stream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
bool errorOccurred = false;
var memoryStream = new MemoryStream(compressedBuffer);
using (var brotliStream = new BrotliInputStream(memoryStream))
{
var decompressedStream = new MemoryStream();
brotliStream.CopyTo(decompressedStream);
decompressedStream.Seek(0, SeekOrigin.Begin);
for (int i = 0; i < _woffHeader.NumTables; i++)
{
var woffDir = _woffDirs[i];
try
{
// bytesCount = (int)woffDir.TransformLength;
bytesCount = (int)woffDir.CompLength;
decompressedStream.Seek(woffDir.Offset, SeekOrigin.Begin);
var tableBuffer = WoffBuffer.ReadBytes(decompressedStream, bytesCount, out bytesRead);
Debug.Assert(bytesRead == bytesCount);
if (bytesRead != bytesCount)
{
return(false);
}
woffDir.CompTable = tableBuffer;
woffDir.OrigTable = tableBuffer;
}
catch (Exception ex)
{
errorOccurred = true;
Trace.TraceError(ex.Message);
}
}
}
if (errorOccurred)
{
return(false);
}
}
for (ushort i = 0; i < numFonts; i++)
{
var collectionEntry = _collectionEntries[i];
var woffFont = _woffFonts[i];
_woffFonts.Add(woffFont);
woffFont.EndDirectory();
}
return(true);
}
public bool Serialize(WoffWriter writer, WoffIndexer pointsWriter, out uint glyphSize)
{
glyphSize = 0;
if (writer == null)
{
return(false);
}
uint startOffset = writer.Offset;
// 1. Write the Glyph Header
writer.WriteInt16(_numContours); // int16 numberOfContours for number of contours: >= 0 is simple glyph, < 0 composite glyph.
writer.WriteInt16(_xMin); // int16 xMin Minimum x for coordinate data.
writer.WriteInt16(_yMin); // int16 yMin Minimum y for coordinate data.
writer.WriteInt16(_xMax); // int16 xMax Maximum x for coordinate data.
writer.WriteInt16(_yMax); // int16 yMax Maximum y for coordinate data.
// 2. Write the Simple Glyph Description, if applicable
if (_glyphType == WoffGlyphType.Simple)
{
// uint16 endPtsOfContours[numberOfContours]
// Array of point indices for the last point of each contour, in increasing numeric order.
Debug.Assert(_endPtsOfContours != null && _endPtsOfContours.Length == _numContours);
if (_endPtsOfContours == null || _endPtsOfContours.Length != _numContours)
{
Debug.Assert(false, "Invalid condition.");
return(false);
}
for (short i = 0; i < _numContours; i++)
{
writer.WriteUInt16(_endPtsOfContours[i]);
}
// uint16 instructionLength Total number of bytes for instructions.
// If instructionLength is zero, no instructions are present for this glyph,
// and this field is followed directly by the flags field.instructionLength
writer.WriteUInt16(_instructionLength);
// uint8 instructions[instructionLength] Array of instruction byte code for the glyph.
if (_instructionLength != 0)
{
Debug.Assert(_instructions != null && _instructions.Length == _instructionLength);
if (_instructions == null || _instructions.Length != _instructionLength)
{
Debug.Assert(false, "Invalid condition.");
return(false);
}
writer.Write(_instructions);
}
// Pack the points
Debug.Assert(_numPoints == _contours.Count);
int pointsCapacity = 5 * _numPoints; // Size without the application of packing.
if (pointsWriter == null)
{
pointsWriter = new WoffIndexer(pointsCapacity);
}
else
{
pointsWriter.Offset = 0;
}
uint pointsLength = 0;
if (PackPoints(pointsWriter, (uint)pointsCapacity, ref pointsLength) == false)
{
Debug.Assert(false, "Invalid condition.");
return(false);
}
// Serialize the points...
writer.Write(pointsWriter.GetBuffer(), 0, (int)pointsLength);
}
// Write the Simple Glyph Description, if applicable
else if (_glyphType == WoffGlyphType.Composite)
{
Debug.Assert(_componentLength != 0);
Debug.Assert(_components != null && _componentLength == _components.Length);
if (_componentLength == 0 || _components == null || _componentLength != _components.Length)
{
Debug.Assert(false, "Invalid condition.");
return(false);
}
// Serialize the Composite Glyph data...
writer.Write(_components, 0, _componentLength);
}
// NOTE: Without the padding the serialization of the glyph fails!
var padBytesLength = WoffBuffer.CalcPadBytes((int)writer.Offset, 4);
if (padBytesLength > 0)
{
var paddingBuffer = new byte[4];
writer.Write(paddingBuffer, 0, padBytesLength);
}
uint endOffset = writer.Offset;
if (endOffset <= startOffset)
{
Debug.Assert(false, "Invalid condition.");
return(false);
}
glyphSize = endOffset - startOffset;
return(true);
}
private bool ReadData(Stream stream, bool isTrueType)
{
if (stream == null)
{
return(false);
}
var tableFlags = WoffTable.TableFlags;
int bytesRead = 0;
// UInt8: flags table type and flags
_flags = (byte)stream.ReadByte();
// The interpretation of the flags field is as follows:
// 1. Bits [0..5] contain an index to the "known tag" table, which represents tags likely to appear in fonts
int tagIndex = _flags & 0x3F;
// If the tag is not present in this table, then the value of this bit field is 63.
if (tagIndex >= 63)
{
// UInt32: tag 4-byte tag (optional)
_tag = WoffBuffer.ReadUInt32BE(WoffBuffer.ReadBytes(stream, 4, out bytesRead), 0);
var name = WoffBuffer.TagString(_tag);
for (int i = 0; i < tableFlags.Count; i++)
{
if (string.Equals(name, tableFlags[i], StringComparison.Ordinal))
{
tagIndex = i;
break;
}
}
}
else
{
_tag = WoffBuffer.TagInt(tableFlags[tagIndex]);
}
// 2. Bits 6 and 7 indicate the preprocessing transformation version number (0-3) that was applied to each table.
int transformVersion = (_flags >> 5) & 0x3;
// UIntBase128: origLength length of original table
if (!WoffBuffer.ReadUIntBase128(stream, out _origLength))
{
return(false);
}
// UIntBase128 transformLength transformed length (if applicable)
// _transformLength = _origLength;
_compLength = _origLength;
_transformLength = 0;
// For all tables in a font, except for 'glyf' and 'loca' tables, transformation version 0
// indicates the null transform where the original table data is passed directly to the
// Brotli compressor for inclusion in the compressed data stream.
if (transformVersion == 0)
{
// "glyf" : 10, "loca" : 11
if (tagIndex == 10 || tagIndex == 11)
{
if (!WoffBuffer.ReadUIntBase128(stream, out _transformLength))
{
return(false);
}
_compLength = _transformLength;
}
}
// The transformation version "1", specified below, is optional and can be applied to
// eliminate certain redundancies in the hmtx table data.
if (transformVersion == 1)
{
// The transformation version 1 described in this subclause is optional and can only
// be used when an input font is TrueType-flavored (i.e. has a glyf table)
// "hmtx" : 3
if (tagIndex == 3 && isTrueType)
{
if (!WoffBuffer.ReadUIntBase128(stream, out _transformLength))
{
return(false);
}
_compLength = _transformLength;
}
}
if (_origLength > 0)
{
_padding = WoffUtils.CalculatePadding(_origLength);
}
return(true);
}
public bool Read(Stream stream)
{
if (stream == null)
{
return(false);
}
Debug.Assert(_woffVersion == WoffUtils.Woff1Version || _woffVersion == WoffUtils.Woff2Version);
var headerSize = this.HeaderSize;
var header = new byte[headerSize];
var sizeRead = stream.Read(header, 0, headerSize);
Debug.Assert(sizeRead == headerSize);
var bufferSize = header.Length;
_signature = WoffBuffer.ReadUInt32BE(header, 0);
_flavor = WoffBuffer.ReadUInt32BE(header, 4);
_length = WoffBuffer.ReadUInt32BE(header, 8);
_numTables = WoffBuffer.ReadUInt16BE(header, 12);
_reserved = WoffBuffer.ReadUInt16BE(header, 14);
_totalSfntSize = WoffBuffer.ReadUInt32BE(header, 16);
if (_woffVersion == WoffUtils.Woff1Version)
{
_majorVersion = WoffBuffer.ReadUInt16BE(header, 20);
_minorVersion = WoffBuffer.ReadUInt16BE(header, 22);
_metaOffset = WoffBuffer.ReadUInt32BE(header, 24);
_metaLength = WoffBuffer.ReadUInt32BE(header, 28);
_metaOrigLength = WoffBuffer.ReadUInt32BE(header, 32);
_privateOffset = WoffBuffer.ReadUInt32BE(header, 36);
_privateLength = WoffBuffer.ReadUInt32BE(header, 40);
}
else
{
_totalCompressedSize = WoffBuffer.ReadUInt32BE(header, 20);
_majorVersion = WoffBuffer.ReadUInt16BE(header, 24);
_minorVersion = WoffBuffer.ReadUInt16BE(header, 26);
_metaOffset = WoffBuffer.ReadUInt32BE(header, 28);
_metaLength = WoffBuffer.ReadUInt32BE(header, 32);
_metaOrigLength = WoffBuffer.ReadUInt32BE(header, 36);
_privateOffset = WoffBuffer.ReadUInt32BE(header, 40);
_privateLength = WoffBuffer.ReadUInt32BE(header, 44);
}
// The signature field in the WOFF-1 header must contain the "magic number" 0x774F4646.
// If the field does not contain this value, user agents must reject the file as invalid.
Debug.Assert((bufferSize == WoffUtils.Woff1HeaderSize)
? _signature == WoffUtils.Woff1Signature : _signature == WoffUtils.Woff2Signature);
// The header includes a reserved field; this must be set to zero.
// If this field is non-zero, a conforming user agent must reject the file as invalid.
Debug.Assert(_reserved == 0);
return(true);
}
