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denoland-deno/ext/node/polyfills/internal/crypto/_randomFill.ts
Bartek Iwańczuk b40086fd7d
refactor(core): include_js_files! 'dir' option doesn't change specifiers (#18019)
This commit changes "include_js_files!" macro from "deno_core"
in a way that "dir" option doesn't cause specifiers to be rewritten 
to include it.

Example:
```
include_js_files! {
  dir "js",
  "hello.js",
}
```

The above definition required embedders to use:
`import ... from "internal:<ext_name>/js/hello.js"`. 
But with this change, the "js" directory in which the files are stored
is an implementation detail, which for embedders results in: 
`import ... from "internal:<ext_name>/hello.js"`.

The directory the files are stored in, is an implementation detail and 
in some cases might result in a significant size difference for the 
snapshot. As an example, in "deno_node" extension, we store the 
source code in "polyfills" directory; which resulted in each specifier 
to look like "internal:deno_node/polyfills/<module_name>", but with 
this change it's "internal:deno_node/<module_name>". 

Given that "deno_node" has over 100 files, many of them having 
several import specifiers to the same extension, this change removes
10 characters from each import specifier.
2023-03-05 02:31:38 +00:00

84 lines
2.1 KiB
TypeScript

// 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;
}