117 lines
2.6 KiB
JavaScript
117 lines
2.6 KiB
JavaScript
var hpack = require('../hpack');
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var utils = hpack.utils;
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var decoder = hpack.decoder;
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var table = hpack.table;
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var assert = utils.assert;
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var inherits = require('inherits');
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var Duplex = require('readable-stream').Duplex;
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function Decompressor(options) {
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Duplex.call(this, {
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readableObjectMode: true
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});
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this._decoder = decoder.create();
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this._table = table.create(options.table);
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}
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inherits(Decompressor, Duplex);
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module.exports = Decompressor;
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Decompressor.create = function create(options) {
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return new Decompressor(options);
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};
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Decompressor.prototype._read = function _read() {
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// We only push!
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};
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Decompressor.prototype._write = function _write(data, enc, cb) {
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this._decoder.push(data);
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cb(null);
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};
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Decompressor.prototype.execute = function execute(cb) {
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while (!this._decoder.isEmpty()) {
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try {
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this._execute();
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} catch (err) {
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if (cb)
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return done(err);
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else
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return this.emit('error', err);
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}
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}
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if (cb)
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done(null);
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function done(err) {
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process.nextTick(function() {
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cb(err);
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});
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}
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};
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Decompressor.prototype.updateTableSize = function updateTableSize(size) {
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this._table.updateSize(size);
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};
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Decompressor.prototype._execute = function _execute() {
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var isIndexed = this._decoder.decodeBit();
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if (isIndexed)
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return this._processIndexed();
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var isIncremental = this._decoder.decodeBit();
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var neverIndex = 0;
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if (!isIncremental) {
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var isUpdate = this._decoder.decodeBit();
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if (isUpdate)
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return this._processUpdate();
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neverIndex = this._decoder.decodeBit();
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}
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this._processLiteral(isIncremental, neverIndex);
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};
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Decompressor.prototype._processIndexed = function _processIndexed() {
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var index = this._decoder.decodeInt();
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var lookup = this._table.lookup(index);
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this.push({ name: lookup.name, value: lookup.value, neverIndex: false });
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};
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Decompressor.prototype._processLiteral = function _processLiteral(inc, never) {
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var index = this._decoder.decodeInt();
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var name;
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var nameSize;
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// Literal header-name too
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if (index === 0) {
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name = this._decoder.decodeStr();
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nameSize = name.length;
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name = utils.stringify(name);
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} else {
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var lookup = this._table.lookup(index);
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nameSize = lookup.nameSize;
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name = lookup.name;
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}
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var value = this._decoder.decodeStr();
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var valueSize = value.length;
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value = utils.stringify(value);
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if (inc)
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this._table.add(name, value, nameSize, valueSize);
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this.push({ name: name, value: value, neverIndex: never !== 0});
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};
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Decompressor.prototype._processUpdate = function _processUpdate() {
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var size = this._decoder.decodeInt();
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this.updateTableSize(size);
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};
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