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Viewing file:     ResizeableBuffer.js (1.41 KB)      -rw-r--r--

class ResizeableBuffer{
  constructor(size=100){
    this.size = size
    this.length = 0
    this.buf = Buffer.alloc(size)
  }
  prepend(val){
    if(Buffer.isBuffer(val)){
      const length = this.length + val.length
      if(length >= this.size){
        this.resize()
        if(length >= this.size){
          throw Error('INVALID_BUFFER_STATE')
        }
      }
      const buf = this.buf
      this.buf = Buffer.alloc(this.size)
      val.copy(this.buf, 0)
      buf.copy(this.buf, val.length)
      this.length += val.length
    }else{
      const length = this.length++
      if(length === this.size){
        this.resize()
      }
      const buf = this.clone()
      this.buf[0] = val
      buf.copy(this.buf,1, 0, length)
    }
  }
  append(val){
    const length = this.length++
    if(length === this.size){
      this.resize()
    }
    this.buf[length] = val
  }
  clone(){
    return Buffer.from(this.buf.slice(0, this.length))
  }
  resize(){
    const length = this.length
    this.size = this.size * 2
    const buf = Buffer.alloc(this.size)
    this.buf.copy(buf,0, 0, length)
    this.buf = buf
  }
  toString(encoding){
    if(encoding){
      return this.buf.slice(0, this.length).toString(encoding)
    }else{
      return Uint8Array.prototype.slice.call(this.buf.slice(0, this.length))
    }
  }
  toJSON(){
    return this.toString('utf8')
  }
  reset(){
    this.length = 0
  }
}

module.exports = ResizeableBuffer