70 lines
1.5 KiB
JavaScript
70 lines
1.5 KiB
JavaScript
BufferList = function() {
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this.buffers = [];
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};
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var p = BufferList.prototype;
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p.add = function(buffer, front) {
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this.buffers[front ? "unshift" : "push"](buffer);
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return this;
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};
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p.addInt16 = function(val, front) {
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return this.add(Buffer([(val >>> 8),(val >>> 0)]),front);
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};
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p.getByteLength = function(initial) {
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return this.buffers.reduce(function(previous, current){
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return previous + current.length;
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},initial || 0);
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};
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p.addInt32 = function(val, first) {
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return this.add(Buffer([
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(val >>> 24 & 0xFF),
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(val >>> 16 & 0xFF),
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(val >>> 8 & 0xFF),
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(val >>> 0 & 0xFF)
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]),first);
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};
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p.addCString = function(val, front) {
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var len = Buffer.byteLength(val);
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var buffer = new Buffer(len+1);
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buffer.write(val);
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buffer[len] = 0;
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return this.add(buffer, front);
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};
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p.addChar = function(char, first) {
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return this.add(Buffer(char,'utf8'), first);
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};
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p.join = function(appendLength, char) {
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var length = this.getByteLength();
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if(appendLength) {
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this.addInt32(length+4, true);
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return this.join(false, char);
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}
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if(char) {
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this.addChar(char, true);
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length++;
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}
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var result = Buffer(length);
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var index = 0;
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this.buffers.forEach(function(buffer) {
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buffer.copy(result, index, 0);
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index += buffer.length;
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});
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return result;
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};
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BufferList.concat = function() {
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var total = new BufferList();
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for(var i = 0; i < arguments.length; i++) {
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total.add(arguments[i]);
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}
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return total.join();
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};
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module.exports = BufferList;
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