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