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82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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import { op_node_fill_random, op_node_fill_random_async } from "ext:core/ops";
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import { MAX_SIZE as kMaxUint32 } from "ext:deno_node/internal/crypto/_randomBytes.ts";
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import { Buffer } from "node:buffer";
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import { isAnyArrayBuffer, isArrayBufferView } from "node:util/types";
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import { ERR_INVALID_ARG_TYPE } from "ext:deno_node/internal/errors.ts";
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const kBufferMaxLength = 0x7fffffff;
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function assertOffset(offset, length) {
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if (offset > kMaxUint32 || offset < 0) {
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throw new TypeError("offset must be a uint32");
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}
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if (offset > kBufferMaxLength || offset > length) {
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throw new RangeError("offset out of range");
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}
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}
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function assertSize(size, offset, length) {
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if (size > kMaxUint32 || size < 0) {
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throw new TypeError("size must be a uint32");
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}
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if (size + offset > length || size > kBufferMaxLength) {
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throw new RangeError("buffer too small");
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}
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}
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export default function randomFill(buf, offset, size, cb) {
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if (typeof offset === "function") {
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cb = offset;
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offset = 0;
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size = buf.length;
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} else if (typeof size === "function") {
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cb = size;
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size = buf.length - Number(offset);
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}
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assertOffset(offset, buf.length);
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assertSize(size, offset, buf.length);
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op_node_fill_random_async(Math.floor(size)).then((randomData) => {
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const randomBuf = Buffer.from(randomData.buffer);
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randomBuf.copy(buf, offset, 0, size);
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cb(null, buf);
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});
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}
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export function randomFillSync(buf, offset = 0, size) {
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if (!isAnyArrayBuffer(buf) && !isArrayBufferView(buf)) {
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throw new ERR_INVALID_ARG_TYPE(
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"buf",
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["ArrayBuffer", "ArrayBufferView"],
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buf,
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);
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}
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assertOffset(offset, buf.byteLength);
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if (size === undefined) {
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size = buf.byteLength - offset;
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} else {
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assertSize(size, offset, buf.byteLength);
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}
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if (size === 0) {
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return buf;
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}
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const bytes = isAnyArrayBuffer(buf)
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? new Uint8Array(buf, offset, size)
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: new Uint8Array(buf.buffer, buf.byteOffset + offset, size);
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op_node_fill_random(bytes);
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return buf;
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}
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