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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { DEFAULT_BUFFER_SIZE } from "./_common.ts";
/** Turns a Reader, `r`, into an async iterator. * * ```ts * import { iterateReader } from "https://deno.land/std@$STD_VERSION/streams/iterate_reader.ts"; * * let f = await Deno.open("/etc/passwd"); * for await (const chunk of iterateReader(f)) { *   console.log(chunk); * } * f.close(); * ``` * * Second argument can be used to tune size of a buffer. * Default size of the buffer is 32kB. * * ```ts * import { iterateReader } from "https://deno.land/std@$STD_VERSION/streams/iterate_reader.ts"; * * let f = await Deno.open("/etc/passwd"); * const it = iterateReader(f, { *   bufSize: 1024 * 1024 * }); * for await (const chunk of it) { *   console.log(chunk); * } * f.close(); * ``` */export async function* iterateReader(  r: Deno.Reader,  options?: {    bufSize?: number;  },): AsyncIterableIterator<Uint8Array> {  const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;  const b = new Uint8Array(bufSize);  while (true) {    const result = await r.read(b);    if (result === null) {      break;    }
    yield b.slice(0, result);  }}
/** Turns a ReaderSync, `r`, into an iterator. * * ```ts * import { iterateReaderSync } from "https://deno.land/std@$STD_VERSION/streams/conversion.ts"; * * let f = Deno.openSync("/etc/passwd"); * for (const chunk of iterateReaderSync(f)) { *   console.log(chunk); * } * f.close(); * ``` * * Second argument can be used to tune size of a buffer. * Default size of the buffer is 32kB. * * ```ts * import { iterateReaderSync } from "https://deno.land/std@$STD_VERSION/streams/iterate_reader.ts";
 * let f = await Deno.open("/etc/passwd"); * const iter = iterateReaderSync(f, { *   bufSize: 1024 * 1024 * }); * for (const chunk of iter) { *   console.log(chunk); * } * f.close(); * ``` * * 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(  r: Deno.ReaderSync,  options?: {    bufSize?: number;  },): IterableIterator<Uint8Array> {  const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;  const b = new Uint8Array(bufSize);  while (true) {    const result = r.readSync(b);    if (result === null) {      break;    }
    yield b.slice(0, result);  }}