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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { DEFAULT_BUFFER_SIZE } from "./_constants.ts";import type { Reader, ReaderSync } from "./types.ts";
export type { Reader, ReaderSync };
/** * Turns a {@linkcode Reader} into an async iterator. * * @example * ```ts * import { iterateReader } from "https://deno.land/std@$STD_VERSION/io/iterate_reader.ts"; * * using file = await Deno.open("/etc/passwd"); * for await (const chunk of iterateReader(file)) { *   console.log(chunk); * } * ``` * * Second argument can be used to tune size of a buffer. * Default size of the buffer is 32kB. * * @example * ```ts * import { iterateReader } from "https://deno.land/std@$STD_VERSION/io/iterate_reader.ts"; * * using file = await Deno.open("/etc/passwd"); * const iter = iterateReader(file, { *   bufSize: 1024 * 1024 * }); * for await (const chunk of iter) { *   console.log(chunk); * } * ``` */export async function* iterateReader(  reader: Reader,  options?: {    bufSize?: number;  },): AsyncIterableIterator<Uint8Array> {  const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;  const b = new Uint8Array(bufSize);  while (true) {    const result = await reader.read(b);    if (result === null) {      break;    }
    yield b.slice(0, result);  }}
/** * Turns a {@linkcode ReaderSync} into an iterator. * * ```ts * import { iterateReaderSync } from "https://deno.land/std@$STD_VERSION/io/iterate_reader.ts"; * * using file = Deno.openSync("/etc/passwd"); * for (const chunk of iterateReaderSync(file)) { *   console.log(chunk); * } * ``` * * Second argument can be used to tune size of a buffer. * Default size of the buffer is 32kB. * * ```ts * import { iterateReaderSync } from "https://deno.land/std@$STD_VERSION/io/iterate_reader.ts";
 * using file = await Deno.open("/etc/passwd"); * const iter = iterateReaderSync(file, { *   bufSize: 1024 * 1024 * }); * for (const chunk of iter) { *   console.log(chunk); * } * ``` * * Iterator uses an internal buffer of fixed size for efficiency; it returns * a view on that buffer on each iteration. It is therefore caller's * responsibility to copy contents of the buffer if needed; otherwise the * next iteration will overwrite contents of previously returned chunk. */export function* iterateReaderSync(  reader: ReaderSync,  options?: {    bufSize?: number;  },): IterableIterator<Uint8Array> {  const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;  const b = new Uint8Array(bufSize);  while (true) {    const result = reader.readSync(b);    if (result === null) {      break;    }
    yield b.slice(0, result);  }}