A Package to read tables of font files like otf, woff and woff2
FontFileReader
A Package to read tables of font files like otf, woff and woff2. At the moment only OS2 Support.
Why?
I needed a way to read the OS2 table from a given font file. Because I was not able to implement fonttools into an app I’m developing I had to write a custom swift implementation. Feel free to contribute.
Usage
// import Library
import FontFileReader
// --------------------------------- //
// Load NSData from file
guard let data = NSData(contentsOf: url) else {
// return or throw error
return
}
// Load data into BinaryFile object
let binary = BinaryFile(data: data)
// Parse the file signature header
let fileSignature = binary.getUInt32()
// Pass the signature into FontFormatHeader objet and check for validity
guard let fontFormat = FontFormatHeader.init(rawValue: fileSignature) else {
// return or throw error
return
}
var fontFileData: FileDataProtocol?
// handle binary according to the format
switch fontFormat {
case .opentype:
fontFileData = OTFFileData(binary: binary)
case .woff:
fontFileData = WOFFFileData(binary: binary)
case .woff2:
fontFileData = WOFF2FileData(binary: binary)
}
guard fontFileData != nil else {
// return or throw error
return
}
// read data from fontFileData from the tables like (at the moment only OS2 Table supported)
let fontWeight = fontFileData!.os2Table.usWeightClass
let fontStyle = fontFileData!.os2Table.fsSelectionDecoded
Todo
- CFF Table Support + Decompression in WOFF2
- implement custom errors to handle errors while parsing (change functions to throwing ones)
- Add comments