66 lines
2.4 KiB
JavaScript
66 lines
2.4 KiB
JavaScript
module.exports = BinaryWriter;
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function BinaryWriter(size, allowResize) {
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this.buffer = new Buffer(size);
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this.position = 0;
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this.allowResize = allowResize;
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}
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function _write(write, size) {
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return function (value, noAssert) {
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this.ensureSize(size);
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write.call(this.buffer, value, this.position, noAssert);
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this.position += size;
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};
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}
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BinaryWriter.prototype.writeUInt8 = _write(Buffer.prototype.writeUInt8, 1);
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BinaryWriter.prototype.writeUInt16LE = _write(Buffer.prototype.writeUInt16LE, 2);
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BinaryWriter.prototype.writeUInt16BE = _write(Buffer.prototype.writeUInt16BE, 2);
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BinaryWriter.prototype.writeUInt32LE = _write(Buffer.prototype.writeUInt32LE, 4);
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BinaryWriter.prototype.writeUInt32BE = _write(Buffer.prototype.writeUInt32BE, 4);
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BinaryWriter.prototype.writeInt8 = _write(Buffer.prototype.writeInt8, 1);
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BinaryWriter.prototype.writeInt16LE = _write(Buffer.prototype.writeInt16LE, 2);
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BinaryWriter.prototype.writeInt16BE = _write(Buffer.prototype.writeInt16BE, 2);
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BinaryWriter.prototype.writeInt32LE = _write(Buffer.prototype.writeInt32LE, 4);
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BinaryWriter.prototype.writeInt32BE = _write(Buffer.prototype.writeInt32BE, 4);
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BinaryWriter.prototype.writeFloatLE = _write(Buffer.prototype.writeFloatLE, 4);
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BinaryWriter.prototype.writeFloatBE = _write(Buffer.prototype.writeFloatBE, 4);
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BinaryWriter.prototype.writeDoubleLE = _write(Buffer.prototype.writeDoubleLE, 8);
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BinaryWriter.prototype.writeDoubleBE = _write(Buffer.prototype.writeDoubleBE, 8);
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BinaryWriter.prototype.writeBuffer = function (buffer) {
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this.ensureSize(buffer.length);
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buffer.copy(this.buffer, this.position, 0, buffer.length);
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this.position += buffer.length;
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};
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BinaryWriter.prototype.writeVarInt = function (value) {
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var length = 1;
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while ((value & 0xFFFFFF80) !== 0) {
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this.writeUInt8((value & 0x7F) | 0x80);
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value >>>= 7;
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length++;
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}
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this.writeUInt8(value & 0x7F);
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return length;
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};
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BinaryWriter.prototype.ensureSize = function (size) {
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if (this.buffer.length < this.position + size) {
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if (this.allowResize) {
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var tempBuffer = new Buffer(this.position + size);
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this.buffer.copy(tempBuffer, 0, 0, this.buffer.length);
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this.buffer = tempBuffer;
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}
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else {
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throw new RangeError('index out of range');
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}
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}
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};
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