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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
// Interfaces 100% copied from Go.
// Documentation liberally lifted from them too.
// Thank you! We love Go! <3
((window) => {
const DEFAULT_BUFFER_SIZE = 32 * 1024;
const { sendSync, sendAsync } = window.__bootstrap.dispatchMinimal;
// Seek whence values.
// https://golang.org/pkg/io/#pkg-constants
const SeekMode = {
0: "Start",
1: "Current",
2: "End",
Start: 0,
Current: 1,
End: 2,
};
async function copy(
src,
dst,
options,
) {
let n = 0;
const bufSize = options?.bufSize ?? DEFAULT_BUFFER_SIZE;
const b = new Uint8Array(bufSize);
let gotEOF = false;
while (gotEOF === false) {
const result = await src.read(b);
if (result === null) {
gotEOF = true;
} else {
let nwritten = 0;
while (nwritten < result) {
nwritten += await dst.write(b.subarray(nwritten, result));
}
n += nwritten;
}
}
return n;
}
async function* iter(
r,
options,
) {
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.subarray(0, result);
}
}
function* iterSync(
r,
options,
) {
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.subarray(0, result);
}
}
function readSync(rid, buffer) {
if (buffer.length === 0) {
return 0;
}
const nread = sendSync("op_read", rid, buffer);
if (nread < 0) {
throw new Error("read error");
}
return nread === 0 ? null : nread;
}
async function read(
rid,
buffer,
) {
if (buffer.length === 0) {
return 0;
}
const nread = await sendAsync("op_read", rid, buffer);
if (nread < 0) {
throw new Error("read error");
}
return nread === 0 ? null : nread;
}
function writeSync(rid, data) {
const result = sendSync("op_write", rid, data);
if (result < 0) {
throw new Error("write error");
}
return result;
}
async function write(rid, data) {
const result = await sendAsync("op_write", rid, data);
if (result < 0) {
throw new Error("write error");
}
return result;
}
window.__bootstrap.io = {
iterSync,
iter,
copy,
SeekMode,
read,
readSync,
write,
writeSync,
};
})(this);
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