/**
* Buffer view.
*/
class BufferView {
/**
* Creates buffer view around buffer.
* @param {Uint8Array} buffer Initial buffer view.
*/
constructor(buffer) {
this.buffer = buffer;
}
/**
* Moves view right.
* @param {number} size Amount of bytes to shift.
*/
shiftRight(size) {
this.buffer = new Uint8Array(this.buffer.buffer, this.buffer.byteOffset + size, this.buffer.length - size);
}
/**
* Returns new limited view.
* @param {number} size Length in bytes.
* @returns {Uint8Array} View limited to specified size.
*/
window(size) {
if (size > this.buffer.length)
throw RangeError(`invalid shrink value: ${size} vs ${this.buffer.length}`);
return new Uint8Array(this.buffer.buffer, this.buffer.byteOffset, size);
}
/**
* Shrinks view to specified size
* @param {number} size New length in bytes.
*/
shrink(size) {
this.buffer = this.window(size);
}
}
module.exports = { BufferView };