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export default class BufferList {
constructor(public buffers: Buffer[] = []) {}
public add(buffer: Buffer, front?: boolean) {
this.buffers[front ? 'unshift' : 'push'](buffer)
return this
}
public addInt16(val: number, front?: boolean) {
return this.add(Buffer.from([val >>> 8, val >>> 0]), front)
}
public getByteLength(initial?: number) {
return this.buffers.reduce(function (previous, current) {
return previous + current.length
}, initial || 0)
}
public addInt32(val: number, first?: boolean) {
return this.add(
Buffer.from([(val >>> 24) & 0xff, (val >>> 16) & 0xff, (val >>> 8) & 0xff, (val >>> 0) & 0xff]),
first
)
}
public addCString(val: string, front?: boolean) {
var len = Buffer.byteLength(val)
var buffer = Buffer.alloc(len + 1)
buffer.write(val)
buffer[len] = 0
return this.add(buffer, front)
}
public addString(val: string, front?: boolean) {
var len = Buffer.byteLength(val)
var buffer = Buffer.alloc(len)
buffer.write(val)
return this.add(buffer, front)
}
public addChar(char: string, first?: boolean) {
return this.add(Buffer.from(char, 'utf8'), first)
}
public addByte(byte: number) {
return this.add(Buffer.from([byte]))
}
public join(appendLength?: boolean, char?: string): Buffer {
var length = this.getByteLength()
if (appendLength) {
this.addInt32(length + 4, true)
return this.join(false, char)
}
if (char) {
this.addChar(char, true)
length++
}
var result = Buffer.alloc(length)
var index = 0
this.buffers.forEach(function (buffer) {
buffer.copy(result, index, 0)
index += buffer.length
})
return result
}
public static concat(): Buffer {
var total = new BufferList()
for (var i = 0; i < arguments.length; i++) {
total.add(arguments[i])
}
return total.join()
}
}