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// Copyright 2018-2021 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
"use strict";
((window) => {
const core = window.Deno.core;
const { DOMException } = window.__bootstrap.domException;
const {
Uint8Array,
ArrayPrototypePush,
MathMin,
TypedArrayPrototypeSubarray,
TypedArrayPrototypeSet,
} = window.__bootstrap.primordials;
const DEFAULT_BUFFER_SIZE = 32 * 1024;
// 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(
TypedArrayPrototypeSubarray(b, 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 TypedArrayPrototypeSubarray(b, 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 TypedArrayPrototypeSubarray(b, 0, result);
}
}
function readSync(rid, buffer) {
if (buffer.length === 0) {
return 0;
}
const nread = core.opSync("op_read_sync", rid, buffer);
return nread === 0 ? null : nread;
}
async function read(rid, buffer) {
if (buffer.length === 0) {
return 0;
}
const nread = await core.read(rid, buffer);
return nread === 0 ? null : nread;
}
function writeSync(rid, data) {
return core.opSync("op_write_sync", rid, data);
}
function write(rid, data) {
return core.write(rid, data);
}
const READ_PER_ITER = 16 * 1024; // 16kb, see https://github.com/denoland/deno/issues/10157
function readAll(r) {
return readAllInner(r);
}
async function readAllInner(r, options) {
const buffers = [];
const signal = options?.signal ?? null;
while (!signal?.aborted) {
const buf = new Uint8Array(READ_PER_ITER);
const read = await r.read(buf);
if (typeof read == "number") {
ArrayPrototypePush(buffers, new Uint8Array(buf.buffer, 0, read));
} else {
break;
}
}
if (signal?.aborted) {
throw new DOMException("The read operation was aborted.", "AbortError");
}
return concatBuffers(buffers);
}
function readAllSync(r) {
const buffers = [];
while (true) {
const buf = new Uint8Array(READ_PER_ITER);
const read = r.readSync(buf);
if (typeof read == "number") {
ArrayPrototypePush(buffers, buf.subarray(0, read));
} else {
break;
}
}
return concatBuffers(buffers);
}
function concatBuffers(buffers) {
let totalLen = 0;
for (const buf of buffers) {
totalLen += buf.byteLength;
}
const contents = new Uint8Array(totalLen);
let n = 0;
for (const buf of buffers) {
TypedArrayPrototypeSet(contents, buf, n);
n += buf.byteLength;
}
return contents;
}
function readAllSyncSized(r, size) {
const buf = new Uint8Array(size + 1); // 1B to detect extended files
let cursor = 0;
while (cursor < size) {
const sliceEnd = MathMin(size + 1, cursor + READ_PER_ITER);
const slice = buf.subarray(cursor, sliceEnd);
const read = r.readSync(slice);
if (typeof read == "number") {
cursor += read;
} else {
break;
}
}
// Handle truncated or extended files during read
if (cursor > size) {
// Read remaining and concat
return concatBuffers([buf, readAllSync(r)]);
} else { // cursor == size
return buf.subarray(0, cursor);
}
}
async function readAllInnerSized(r, size, options) {
const buf = new Uint8Array(size + 1); // 1B to detect extended files
let cursor = 0;
const signal = options?.signal ?? null;
while (!signal?.aborted && cursor < size) {
const sliceEnd = MathMin(size + 1, cursor + READ_PER_ITER);
const slice = buf.subarray(cursor, sliceEnd);
const read = await r.read(slice);
if (typeof read == "number") {
cursor += read;
} else {
break;
}
}
if (signal?.aborted) {
throw new DOMException("The read operation was aborted.", "AbortError");
}
// Handle truncated or extended files during read
if (cursor > size) {
// Read remaining and concat
return concatBuffers([buf, await readAllInner(r, options)]);
} else {
return buf.subarray(0, cursor);
}
}
window.__bootstrap.io = {
iterSync,
iter,
copy,
SeekMode,
read,
readSync,
write,
writeSync,
readAll,
readAllInner,
readAllSync,
readAllSyncSized,
readAllInnerSized,
};
})(this);
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