public WoffFont(WoffHeader woffHeader, CollectionHeader collHeader, CollectionFontEntry collEntry)
: this(woffHeader)
{
_collectionHeader = collHeader;
_collectionEntry = collEntry;
}
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);
}
