mirror of
https://github.com/denoland/deno.git
synced 2024-12-25 00:29:09 -05:00
fa61956f03
Co-authored-by: Ryan Dahl <ry@tinyclouds.org>
135 lines
2.6 KiB
JavaScript
135 lines
2.6 KiB
JavaScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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// Interfaces 100% copied from Go.
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// Documentation liberally lifted from them too.
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// Thank you! We love Go! <3
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((window) => {
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const DEFAULT_BUFFER_SIZE = 32 * 1024;
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const { sendSync, sendAsync } = window.__bootstrap.dispatchMinimal;
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// Seek whence values.
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// https://golang.org/pkg/io/#pkg-constants
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const SeekMode = {
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0: "Start",
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1: "Current",
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2: "End",
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Start: 0,
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Current: 1,
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End: 2,
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};
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async function copy(
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src,
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dst,
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options,
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) {
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let n = 0;
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const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;
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const b = new Uint8Array(bufSize);
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let gotEOF = false;
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while (gotEOF === false) {
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const result = await src.read(b);
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if (result === null) {
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gotEOF = true;
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} else {
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let nwritten = 0;
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while (nwritten < result) {
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nwritten += await dst.write(b.subarray(nwritten, result));
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}
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n += nwritten;
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}
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}
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return n;
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}
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async function* iter(
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r,
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options,
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) {
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const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;
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const b = new Uint8Array(bufSize);
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while (true) {
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const result = await r.read(b);
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if (result === null) {
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break;
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}
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yield b.subarray(0, result);
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}
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}
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function* iterSync(
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r,
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options,
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) {
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const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;
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const b = new Uint8Array(bufSize);
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while (true) {
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const result = r.readSync(b);
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if (result === null) {
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break;
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}
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yield b.subarray(0, result);
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}
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}
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function readSync(rid, buffer) {
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if (buffer.length === 0) {
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return 0;
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}
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const nread = sendSync("op_read", rid, buffer);
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if (nread < 0) {
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throw new Error("read error");
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}
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return nread === 0 ? null : nread;
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}
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async function read(
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rid,
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buffer,
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) {
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if (buffer.length === 0) {
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return 0;
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}
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const nread = await sendAsync("op_read", rid, buffer);
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if (nread < 0) {
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throw new Error("read error");
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}
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return nread === 0 ? null : nread;
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}
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function writeSync(rid, data) {
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const result = sendSync("op_write", rid, data);
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if (result < 0) {
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throw new Error("write error");
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}
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return result;
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}
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async function write(rid, data) {
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const result = await sendAsync("op_write", rid, data);
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if (result < 0) {
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throw new Error("write error");
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}
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return result;
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}
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window.__bootstrap.io = {
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iterSync,
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iter,
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copy,
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SeekMode,
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read,
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readSync,
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write,
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writeSync,
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};
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})(this);
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