99 lines
2.3 KiB
JavaScript
99 lines
2.3 KiB
JavaScript
var BufferWriter = function BufferWriter(bufs) {
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if (!(this instanceof BufferWriter))
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return new BufferReader(buf);
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this.bufs = bufs || [];
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};
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BufferWriter.prototype.concat = function() {
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return Buffer.concat(this.bufs);
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};
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BufferWriter.prototype.write = function(buf) {
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this.bufs.push(buf);
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return this;
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};
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BufferWriter.prototype.writeUInt8 = function(n) {
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var buf = new Buffer(1);
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buf.writeUInt8(n, 0);
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this.write(buf);
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return this;
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};
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BufferWriter.prototype.writeUInt16BE = function(n) {
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var buf = new Buffer(2);
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buf.writeUInt16BE(n, 0);
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this.write(buf);
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return this;
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};
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BufferWriter.prototype.writeUInt16LE = function(n) {
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var buf = new Buffer(2);
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buf.writeUInt16LE(n, 0);
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this.write(buf);
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return this;
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};
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BufferWriter.prototype.writeUInt32BE = function(n) {
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var buf = new Buffer(4);
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buf.writeUInt32BE(n, 0);
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this.write(buf);
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return this;
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};
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BufferWriter.prototype.writeUInt32LE = function(n) {
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var buf = new Buffer(4);
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buf.writeUInt32LE(n, 0);
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this.write(buf);
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return this;
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};
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//TODO: What if n is so large that it loses precision?
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BufferWriter.prototype.writeUInt64BE = function(n) {
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var buf = new Buffer(8);
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buf.writeInt32BE(n & -1, 4);
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buf.writeUInt32BE(Math.floor(n / 0x100000000), 0);
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this.write(buf);
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return this;
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};
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//TODO: What if n is so large that it loses precision?
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BufferWriter.prototype.writeUInt64LE = function(n) {
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var buf = new Buffer(8);
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buf.writeInt32LE(n & -1, 0);
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buf.writeUInt32LE(Math.floor(n / 0x100000000), 4);
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this.write(buf);
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return this;
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};
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BufferWriter.prototype.writeVarInt = function(n) {
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var buf = BufferWriter.varIntBuf(n);
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this.write(buf);
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return this;
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};
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//TODO: What if n is so large that it loses precision?
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BufferWriter.varIntBuf = function(n) {
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var buf = undefined;
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if (n < 253) {
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buf = new Buffer(1);
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buf.writeUInt8(n, 0);
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} else if (n < 0x10000) {
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buf = new Buffer(1 + 2);
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buf.writeUInt8(253, 0);
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buf.writeUInt16LE(n, 1);
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} else if (n < 0x100000000) {
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buf = new Buffer(1 + 4);
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buf.writeUInt8(254, 0);
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buf.writeUInt32LE(n, 1);
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} else {
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buf = new Buffer(1 + 8);
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buf.writeUInt8(255, 0);
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buf.writeInt32LE(n & -1, 1);
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buf.writeUInt32LE(Math.floor(n / 0x100000000), 5);
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}
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return buf;
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};
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module.exports = BufferWriter;
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