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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import randomBytes, {
MAX_SIZE as kMaxUint32,
} from "internal:deno_node/internal/crypto/_randomBytes.ts";
import { Buffer } from "internal:deno_node/buffer.ts";
const kBufferMaxLength = 0x7fffffff;
function assertOffset(offset: number, length: number) {
if (offset > kMaxUint32 || offset < 0) {
throw new TypeError("offset must be a uint32");
}
if (offset > kBufferMaxLength || offset > length) {
throw new RangeError("offset out of range");
}
}
function assertSize(size: number, offset: number, length: number) {
if (size > kMaxUint32 || size < 0) {
throw new TypeError("size must be a uint32");
}
if (size + offset > length || size > kBufferMaxLength) {
throw new RangeError("buffer too small");
}
}
export default function randomFill(
buf: Buffer,
cb: (err: Error | null, buf: Buffer) => void,
): void;
export default function randomFill(
buf: Buffer,
offset: number,
cb: (err: Error | null, buf: Buffer) => void,
): void;
export default function randomFill(
buf: Buffer,
offset: number,
size: number,
cb: (err: Error | null, buf: Buffer) => void,
): void;
export default function randomFill(
buf: Buffer,
offset?: number | ((err: Error | null, buf: Buffer) => void),
size?: number | ((err: Error | null, buf: Buffer) => void),
cb?: (err: Error | null, buf: Buffer) => void,
) {
if (typeof offset === "function") {
cb = offset;
offset = 0;
size = buf.length;
} else if (typeof size === "function") {
cb = size;
size = buf.length - Number(offset as number);
}
assertOffset(offset as number, buf.length);
assertSize(size as number, offset as number, buf.length);
randomBytes(size as number, (err, bytes) => {
if (err) return cb!(err, buf);
bytes?.copy(buf, offset as number);
cb!(null, buf);
});
}
export function randomFillSync(buf: Buffer, offset = 0, size?: number) {
assertOffset(offset, buf.length);
if (size === undefined) size = buf.length - offset;
assertSize(size, offset, buf.length);
const bytes = randomBytes(size);
bytes.copy(buf, offset);
return buf;
}
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