81 lines
1.7 KiB
JavaScript
81 lines
1.7 KiB
JavaScript
function CustomBuffer(existingBuffer) {
|
|
var buffer = existingBuffer || new Buffer(48);
|
|
var offset = 0;
|
|
|
|
this.writeVarInt = function(val) {
|
|
while (true) {
|
|
if ((val & 0xFFFFFF80) == 0) {
|
|
this.writeUByte(val);
|
|
|
|
return;
|
|
}
|
|
|
|
this.writeUByte(val & 0x7F | 0x80);
|
|
|
|
val = val >>> 7;
|
|
}
|
|
};
|
|
|
|
this.writeString = function(string) {
|
|
this.writeVarInt(string.length);
|
|
|
|
if (offset + string.length >= buffer.length) {
|
|
Buffer.concat([buffer, new Buffer(string.length)]);
|
|
}
|
|
|
|
buffer.write(string, offset, string.length, "UTF-8");
|
|
|
|
offset += string.length;
|
|
};
|
|
|
|
this.writeUShort = function(val) {
|
|
this.writeUByte(val >> 8);
|
|
this.writeUByte(val & 0xFF);
|
|
};
|
|
|
|
this.writeUByte = function(val) {
|
|
if (offset + 1 >= buffer.length) {
|
|
Buffer.concat([buffer, new Buffer(50)]);
|
|
}
|
|
|
|
buffer.writeUInt8(val, offset++);
|
|
};
|
|
|
|
this.readVarInt = function() {
|
|
var val = 0;
|
|
var count = 0;
|
|
|
|
while (true) {
|
|
var i = buffer.readUInt8(offset++);
|
|
|
|
val |= (i & 0x7F) << count++ * 7;
|
|
|
|
if ((i & 0x80) != 128) {
|
|
break
|
|
}
|
|
}
|
|
|
|
return val;
|
|
};
|
|
|
|
this.readString = function() {
|
|
var length = this.readVarInt();
|
|
var str = buffer.toString("UTF-8", offset, offset + length);
|
|
|
|
offset += length;
|
|
|
|
return str;
|
|
};
|
|
|
|
this.buffer = function() {
|
|
return buffer.slice(0, offset);
|
|
};
|
|
|
|
this.offset = function() {
|
|
return offset;
|
|
};
|
|
}
|
|
|
|
exports.createBuffer = function(buffer) {
|
|
return new CustomBuffer(buffer);
|
|
}; |