public static bool Load(FontParser parser, FontFace font, bool full)
{
font.RequiresLoad = !full;
font.Parser = parser;
// Read the magic number:
uint magic = parser.ReadUInt32();
if (magic == 0x00010000)
{
// TTF outline format.
}
else if (magic == 0x774F4646)
{
// WOFF 1
return(WoffLoader.Load(1, parser, font));
}
else if (magic == 0x774F4632)
{
// WOFF 2
return(WoffLoader.Load(2, parser, font));
}
else
{
// OpenType (probably) 0x4F54544F
// Reset to start:
parser.Position = 0;
// OpenType. Read the tag (right at the start):
string openTypeVersion = parser.ReadTag();
if (openTypeVersion == "OTTO")
{
// CFF outline format.
}
else
{
// Unsupported format.
return(false);
}
}
// Table count:
int numTables = parser.ReadUInt16();
// Move to p12:
parser.Position = 12;
for (int i = 0; i < numTables; i++)
{
// Read the tables tag (e.g. GPOS):
string tag = parser.ReadTag();
// Move parser along:
parser.Position += 4;
// Read the offset:
int offset = (int)parser.ReadUInt32();
// Grab the position - this allows the tables to mess it up:
int basePosition = parser.Position;
// Handle the table now:
if (!parser.HandleTable(tag, offset, font))
{
return(false);
}
// Skip meta:
parser.Position = basePosition + 4;
}
if (full)
{
return(ReadTables(parser, font));
}
return(true);
}
public static bool Load(int version, FontParser parser, FontFace font)
{
// Load the V1/V2 header:
ushort numTables;
LoadHeader(version, parser, out numTables);
if (version == 1)
{
MemoryStream ms = new MemoryStream(parser.Data);
// Get the ZLIB compression helper:
Compressor zLib = Compression.Get("zlib");
// Read each table next.
for (int i = 0; i < numTables; i++)
{
string tag = parser.ReadTag();
uint offset = parser.ReadUInt32();
uint compLength = parser.ReadUInt32();
uint origLength = parser.ReadUInt32();
parser.ReadUInt32(); // origChecksum
// Cache position:
int pos = parser.Position;
if (compLength != origLength)
{
// Decompress the table now (zlib)
// Seek to table:
ms.Position = (int)offset;
// Decompressed data:
byte[] decompressedTable = new byte[(int)origLength];
// Decompress now into our target bytes:
zLib.Decompress(ms, decompressedTable);
}
else
{
// Ordinary table.
parser.HandleTable(tag, (int)offset, font);
}
// Restore position:
parser.Position = pos;
}
}
else if (version == 2)
{
// Read each table entry next. The data here is compressed as one single block after the table meta.
Woff2Table[] tableHeaders = new Woff2Table[numTables];
int offset = 0;
for (int i = 0; i < numTables; i++)
{
// Read the table entry:
byte flags = parser.ReadByte();
string tag;
int tagFlag = (flags & 63);
if (tagFlag == 63)
{
tag = parser.ReadTag();
}
else
{
tag = TagLookup[tagFlag];
}
ulong origLength = parser.ReadBase128();
ulong transformLength = 0;
int transformVersion = (flags >> 6); //0-3
if (tag == "glyf" || tag == "loca")
{
// transform length:
transformLength = parser.ReadBase128();
}
offset += (int)origLength;
tableHeaders[i] = new Woff2Table(tag, offset, (int)transformLength, transformVersion);
}
}
// All ok:
return(true);
}
