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import r from 'restructure';
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import TTFFont from './TTFFont';
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let DFontName = new r.String(r.uint8);
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let DFontData = new r.Struct({
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len: r.uint32,
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buf: new r.Buffer('len')
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});
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let Ref = new r.Struct({
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id: r.uint16,
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nameOffset: r.int16,
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attr: r.uint8,
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dataOffset: r.uint24,
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handle: r.uint32
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});
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let Type = new r.Struct({
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name: new r.String(4),
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maxTypeIndex: r.uint16,
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refList: new r.Pointer(r.uint16, new r.Array(Ref, t => t.maxTypeIndex + 1), { type: 'parent' })
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});
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let TypeList = new r.Struct({
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length: r.uint16,
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types: new r.Array(Type, t => t.length + 1)
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});
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let DFontMap = new r.Struct({
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reserved: new r.Reserved(r.uint8, 24),
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typeList: new r.Pointer(r.uint16, TypeList),
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nameListOffset: new r.Pointer(r.uint16, 'void')
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});
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let DFontHeader = new r.Struct({
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dataOffset: r.uint32,
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map: new r.Pointer(r.uint32, DFontMap),
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dataLength: r.uint32,
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mapLength: r.uint32
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});
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export default class DFont {
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static probe(buffer) {
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let stream = new r.DecodeStream(buffer);
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try {
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var header = DFontHeader.decode(stream);
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} catch (e) {
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return false;
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}
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for (let type of header.map.typeList.types) {
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if (type.name === 'sfnt') {
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return true;
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}
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}
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return false;
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}
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constructor(stream) {
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this.stream = stream;
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this.header = DFontHeader.decode(this.stream);
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for (let type of this.header.map.typeList.types) {
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for (let ref of type.refList) {
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if (ref.nameOffset >= 0) {
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this.stream.pos = ref.nameOffset + this.header.map.nameListOffset;
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ref.name = DFontName.decode(this.stream);
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} else {
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ref.name = null;
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}
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}
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if (type.name === 'sfnt') {
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this.sfnt = type;
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}
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}
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}
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getFont(name) {
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if (!this.sfnt) {
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return null;
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}
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for (let ref of this.sfnt.refList) {
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let pos = this.header.dataOffset + ref.dataOffset + 4;
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let stream = new r.DecodeStream(this.stream.buffer.slice(pos));
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let font = new TTFFont(stream);
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if (font.postscriptName === name) {
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return font;
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}
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}
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return null;
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}
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get fonts() {
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let fonts = [];
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for (let ref of this.sfnt.refList) {
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let pos = this.header.dataOffset + ref.dataOffset + 4;
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let stream = new r.DecodeStream(this.stream.buffer.slice(pos));
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fonts.push(new TTFFont(stream));
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}
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return fonts;
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}
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}
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