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import r from '@foliojs-fork/restructure';
import Tables from './';
let TableEntry = new r.Struct({
tag: new r.String(4),
checkSum: r.uint32,
offset: new r.Pointer(r.uint32, 'void', { type: 'global' }),
length: r.uint32
});
let Directory = new r.Struct({
tag: new r.String(4),
numTables: r.uint16,
searchRange: r.uint16,
entrySelector: r.uint16,
rangeShift: r.uint16,
tables: new r.Array(TableEntry, 'numTables')
});
Directory.process = function() {
let tables = {};
for (let table of this.tables) {
tables[table.tag] = table;
}
this.tables = tables;
};
Directory.preEncode = function(stream) {
let tables = [];
for (let tag in this.tables) {
let table = this.tables[tag];
if (table) {
tables.push({
tag: tag,
checkSum: 0,
offset: new r.VoidPointer(Tables[tag], table),
length: Tables[tag].size(table)
});
}
}
this.tag = 'true';
this.numTables = tables.length;
this.tables = tables;
let maxExponentFor2 = Math.floor((Math.log(this.numTables) / Math.LN2));
let maxPowerOf2 = Math.pow(2, maxExponentFor2);
this.searchRange = maxPowerOf2 * 16;
this.entrySelector = Math.log(maxPowerOf2) / Math.LN2;
this.rangeShift = this.numTables * 16 - this.searchRange;
};
export default Directory;