capnp-js/reader/Arena.js

Capnproto run-time decoding and encoding for Node

var Limiter = require('./Limiter');
    var Reader = function(segments, maxDepth, maxBytes) {
        /* No more than 64 chained pointer dereferences allowed by default. */
        this.maxDepth = maxDepth || 64;
        /* No more than 64 MiB of data to be dereferenced by default. */
        this.limiter = new Limiter(maxBytes || 67108864);
        this._segments = segments;
    };
    Reader.prototype.setMaxDepth = function(maxDepth) {
        this.maxDepth = maxDepth;
    };
    Reader.prototype.setMaxBytes = function(maxBytes) {
        this.limiter.maxBytes = maxBytes;
    };
    Reader.prototype.getSegment = function(id) {
        if (id >= this._segments.length) {
            throw new RangeError();
        }
        return this._segments[id];
    };
    Reader.IS_READER = Reader.prototype.IS_READER = false;
    Reader.prototype.getRoot = function(Structure) {
        return Structure._deref(this, this._root(), 0);
    };
    Reader.prototype._root = function() {
        return {
            segment: this._segments[0],
            position: 0
        };
    };
    module.exports = Reader;