// The `ltag` table stores IETF BCP-47 language tags. It allows supporting
// languages for which TrueType does not assign a numeric code.
// https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ltag.html
// http://www.w3.org/International/articles/language-tags/
// http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry

import check from '../check';
import parse from '../parse';

function parseLtagTable(data, start) {
    const p = new parse.Parser(data, start);
    const tableVersion = p.parseULong();
    check.argument(tableVersion === 1, 'Unsupported ltag table version.');
    // The 'ltag' specification does not define any flags; skip the field.
    p.skip('uLong', 1);
    const numTags = p.parseULong();

    const tags = [];
    for (let i = 0; i < numTags; i++) {
        let tag = '';
        const offset = start + p.parseUShort();
        const length = p.parseUShort();
        for (let j = offset; j < offset + length; ++j) {
            tag += String.fromCharCode(data.getInt8(j));
        }

        tags.push(tag);
    }

    return tags;
}

export default { parse: parseLtagTable };