pluie-bin/lib/bin.js

module.exports = function (ns) {
    
    require('./encoder')(ns);

    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    String.prototype.removeEndNullBytes = function() {
        return this.replace(/\0+$/g, '');
    }
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    String.prototype.removeStartNullBytes = function() {
        return this.replace(/^\0+/g, '');
    }

    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.enc = new ns.TextEncoder("utf-8");
    ns.dec = new ns.TextDecoder("utf-8", {fatal: true});
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.intFromBytes = function(bytes)
    {
        var value = null;
        if (bytes!=null && bytes.length > 0) {
            // Big Endian
            for (var i = value = 0, lim = bytes.length; i < lim; i++) {
                value = value * 256 + bytes[i];
            }
        }
        return value;
    };
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.bytesFromInt = function(value, size)
    {
        var bytes = new Uint8Array(size);
        while (value) {
            bytes.set([value & 255], --size);
            value >>= 8;
        }
        return bytes;
    };
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.pack = function(size, type, value)
    {
        var packed = null 
        if (type == 'n' || type == 'N') {
            // js int max on 32 signed bits
            if (value >= 0 && value <= 2147483647) {
                packed = this.bytesFromInt(value, type == 'n' ? 2 : 4);
            }
        }
        else if (type == 'a') {
            packed = new Uint8Array(size);
            packed.set(this.enc.encode(value), 0);
        }
        return packed;
    };
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.unpack = function(size, type, bytes)
    {
        var unpacked = null 
        if (type == 'n' || type == 'N') {
            var selByte = bytes.slice(0, size*(type == 'n' ? 2 : 4));
            unpacked = this.intFromBytes(selByte);
        }
        else if (type == 'a') {
            unpacked = this.dec.decode(bytes.slice(0, size)).removeEndNullBytes();
        }
        return unpacked;
    };
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.mergeBuffers = function(bufferArray)
    {
        var maxLength = 0;
        for(var i=0, lim=bufferArray.length; i < lim; i++) {
            if (bufferArray[i] != null) {
                maxLength += bufferArray[i].byteLength;
            }
        }
        var tmp = new Uint8Array(maxLength);
        for(var i=0, pos = 0, lim=bufferArray.length; i < lim; i++) {
            if (bufferArray[i] != null) {
                tmp.set(new Uint8Array(bufferArray[i]), pos);
                pos += bufferArray[i].byteLength;
            }
        }
        return tmp;
    };
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ns.getBuffer = function(array, size)
    {
        var buffer  = new Uint8Array(!size ? array.length : size);
        buffer.set(new Uint8Array(array), 0);
        return buffer;
    };
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    require('./file')(ns);
    return ns;
}