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denoland-deno/io/util.ts

29 lines
743 B
TypeScript

import { Buffer, Reader } from "deno";
export function assert(cond: boolean, msg = "assert") {
if (!cond) {
throw Error(msg);
}
}
// `off` is the offset into `dst` where it will at which to begin writing values
// from `src`.
// Returns the number of bytes copied.
export function copyBytes(dst: Uint8Array, src: Uint8Array, off = 0): number {
const r = dst.byteLength - off;
if (src.byteLength > r) {
src = src.subarray(0, r);
}
dst.set(src, off);
return src.byteLength;
}
export function charCode(s: string): number {
return s.charCodeAt(0);
}
const encoder = new TextEncoder();
export function stringsReader(s: string): Reader {
const ui8 = encoder.encode(s);
return new Buffer(ui8.buffer as ArrayBuffer);
}