import { ALLOCATE, REGISTER, HEADER, HEADER_SIZE, MAX_BYTELENGTH } from "./runtime"; import { E_INVALIDLENGTH } from "./util/error"; @sealed export class ArrayBuffer { static isView<T>(value: T): bool { if (value) { if (value instanceof Int8Array) return true; if (value instanceof Uint8Array) return true; if (value instanceof Uint8ClampedArray) return true; if (value instanceof Int16Array) return true; if (value instanceof Uint16Array) return true; if (value instanceof Int32Array) return true; if (value instanceof Uint32Array) return true; if (value instanceof Int64Array) return true; if (value instanceof Uint64Array) return true; if (value instanceof Float32Array) return true; if (value instanceof Float64Array) return true; if (value instanceof DataView) return true; } return false; } constructor(length: i32) { if (<u32>length > <u32>MAX_BYTELENGTH) throw new RangeError(E_INVALIDLENGTH); var buffer = ALLOCATE(<usize>length); memory.fill(changetype<usize>(buffer), 0, <usize>length); return REGISTER<ArrayBuffer>(buffer); } get byteLength(): i32 { return changetype<HEADER>(changetype<usize>(this) - HEADER_SIZE).payloadSize; } slice(begin: i32 = 0, end: i32 = MAX_BYTELENGTH): ArrayBuffer { var length = this.byteLength; begin = begin < 0 ? max(length + begin, 0) : min(begin, length); end = end < 0 ? max(length + end , 0) : min(end , length); var outSize = <usize>max(end - begin, 0); var out = ALLOCATE(outSize); memory.copy(out, changetype<usize>(this) + <usize>begin, outSize); return REGISTER<ArrayBuffer>(out); } toString(): string { return "[object ArrayBuffer]"; } }