57 lines
1.1 KiB
JavaScript
57 lines
1.1 KiB
JavaScript
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var Writer = function() {
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this.buffers = [];
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};
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var p = Writer.prototype;
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p.add = function(buffer) {
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this.buffers.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([
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(val >>> 8),
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(val >>> 0)
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]));
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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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]));
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};
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p.addCString = function(val) {
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return this.add(Buffer(val + '\0','utf8'));
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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() {
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var result = Buffer(this.getByteLength());
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var index = 0;
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var buffers = this.buffers;
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var length = this.buffers.length;
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for(var i = 0; i < length; i ++) {
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var buffer = buffers[i];
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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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module.exports = Writer;
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