static TableEntryCollection CreateTableEntryCollection(WoffTableDirectory[] woffTableDirs)
{
TableEntryCollection tableEntryCollection = new TableEntryCollection();
for (int i = 0; i < woffTableDirs.Length; ++i)
{
WoffTableDirectory woffTableDir = woffTableDirs[i];
tableEntryCollection.AddEntry(
new UnreadTableEntry(
new TableHeader(woffTableDir.tag,
woffTableDir.origChecksum,
(uint)woffTableDir.ExpectedStartAt,
woffTableDir.origLength)));
}
return(tableEntryCollection);
}
WoffTableDirectory[] ReadTableDirectories(BinaryReader reader)
{
//The table directory is an array of WOFF table directory entries, as defined below.
//The directory follows immediately after the WOFF file header;
//therefore, there is no explicit offset in the header pointing to this block.
//Its size is calculated by multiplying the numTables value in the WOFF header times the size of a single WOFF table directory.
//Each table directory entry specifies the size and location of a single font data table.
uint tableCount = (uint)_header.numTables; //?
//tableDirs = new WoffTableDirectory[tableCount];
long expectedStartAt = 0;
//simulate table entry collection
//var tableEntryCollection = new TableEntryCollection((int)tableCount);
WoffTableDirectory[] tableDirs = new WoffTableDirectory[tableCount];
for (int i = 0; i < tableCount; ++i)
{
//UInt32 tag 4-byte sfnt table identifier.
//UInt32 offset Offset to the data, from beginning of WOFF file.
//UInt32 compLength Length of the compressed data, excluding padding.
//UInt32 origLength Length of the uncompressed table, excluding padding.
//UInt32 origChecksum Checksum of the uncompressed table.
WoffTableDirectory table = new WoffTableDirectory();
table.tag = reader.ReadUInt32();
table.offset = reader.ReadUInt32();
table.compLength = reader.ReadUInt32();
table.origLength = reader.ReadUInt32();
table.origChecksum = reader.ReadUInt32();
table.ExpectedStartAt = expectedStartAt;
table.Name = Utils.TagToString(table.tag);
//var tableHeader = new TableHeader(tag, origChecksum, (uint)expectedStartAt, origLength);
//var unreadTable = new UnreadTableEntry(tableHeader);
//tableEntryCollection.AddEntry(unreadTable);
//table.unreadTableEntry = unreadTable;
tableDirs[i] = table;
expectedStartAt += table.origLength;
}
return(tableDirs);
}
bool Extract(BinaryReader reader, WoffTableDirectory[] tables, Stream newDecompressedStream)
{
for (int i = 0; i < tables.Length; ++i)
{
//UInt32 tag 4-byte sfnt table identifier.
//UInt32 offset Offset to the data, from beginning of WOFF file.
//UInt32 compLength Length of the compressed data, excluding padding.
//UInt32 origLength Length of the uncompressed table, excluding padding.
//UInt32 origChecksum Checksum of the uncompressed table.
WoffTableDirectory table = tables[i];
reader.BaseStream.Seek(table.offset, SeekOrigin.Begin);
//indeed, table may be compress or not=> check length of before and after ...
byte[] compressedBuffer = reader.ReadBytes((int)table.compLength);
if (compressedBuffer.Length == table.origLength)
{
//not a compress buffer
newDecompressedStream.Write(compressedBuffer, 0, compressedBuffer.Length);
}
else
{
var decompressedBuffer = new byte[table.origLength];
if (!DecompressHandler(compressedBuffer, decompressedBuffer))
{
//if not pass set to null
decompressedBuffer = null;
}
else
{
//pass
newDecompressedStream.Write(decompressedBuffer, 0, decompressedBuffer.Length);
}
}
}
newDecompressedStream.Flush();
return(true);
}