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