mirror of
https://github.com/denoland/deno.git
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133 lines
4.1 KiB
JavaScript
133 lines
4.1 KiB
JavaScript
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.
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import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
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import { validateEncoding, validateInteger } from "internal:deno_node/polyfills/internal/validators.mjs";
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import {
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getValidatedFd,
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showStringCoercionDeprecation,
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validateOffsetLengthWrite,
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validateStringAfterArrayBufferView,
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} from "internal:deno_node/polyfills/internal/fs/utils.mjs";
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import { isArrayBufferView } from "internal:deno_node/polyfills/internal/util/types.ts";
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import { maybeCallback } from "internal:deno_node/polyfills/_fs/_fs_common.ts";
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export function writeSync(fd, buffer, offset, length, position) {
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fd = getValidatedFd(fd);
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const innerWriteSync = (fd, buffer, offset, length, position) => {
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if (buffer instanceof DataView) {
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buffer = new Uint8Array(buffer.buffer);
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}
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if (typeof position === "number") {
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Deno.seekSync(fd, position, Deno.SeekMode.Start);
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}
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let currentOffset = offset;
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const end = offset + length;
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while (currentOffset - offset < length) {
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currentOffset += Deno.writeSync(fd, buffer.subarray(currentOffset, end));
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}
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return currentOffset - offset;
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};
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if (isArrayBufferView(buffer)) {
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if (position === undefined) {
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position = null;
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}
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if (offset == null) {
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offset = 0;
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} else {
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validateInteger(offset, "offset", 0);
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}
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if (typeof length !== "number") {
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length = buffer.byteLength - offset;
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}
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validateOffsetLengthWrite(offset, length, buffer.byteLength);
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return innerWriteSync(fd, buffer, offset, length, position);
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}
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validateStringAfterArrayBufferView(buffer, "buffer");
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validateEncoding(buffer, length);
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if (offset === undefined) {
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offset = null;
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}
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buffer = Buffer.from(buffer, length);
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return innerWriteSync(fd, buffer, 0, buffer.length, position);
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}
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/** Writes the buffer to the file of the given descriptor.
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* https://nodejs.org/api/fs.html#fswritefd-buffer-offset-length-position-callback
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* https://github.com/nodejs/node/blob/42ad4137aadda69c51e1df48eee9bc2e5cebca5c/lib/fs.js#L797
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*/
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export function write(fd, buffer, offset, length, position, callback) {
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fd = getValidatedFd(fd);
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const innerWrite = async (fd, buffer, offset, length, position) => {
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if (buffer instanceof DataView) {
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buffer = new Uint8Array(buffer.buffer);
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}
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if (typeof position === "number") {
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await Deno.seek(fd, position, Deno.SeekMode.Start);
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}
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let currentOffset = offset;
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const end = offset + length;
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while (currentOffset - offset < length) {
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currentOffset += await Deno.write(
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fd,
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buffer.subarray(currentOffset, end),
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);
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}
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return currentOffset - offset;
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};
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if (isArrayBufferView(buffer)) {
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callback = maybeCallback(callback || position || length || offset);
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if (offset == null || typeof offset === "function") {
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offset = 0;
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} else {
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validateInteger(offset, "offset", 0);
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}
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if (typeof length !== "number") {
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length = buffer.byteLength - offset;
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}
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if (typeof position !== "number") {
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position = null;
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}
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validateOffsetLengthWrite(offset, length, buffer.byteLength);
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innerWrite(fd, buffer, offset, length, position).then(
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(nwritten) => {
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callback(null, nwritten, buffer);
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},
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(err) => callback(err),
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);
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return;
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}
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// Here the call signature is
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// `fs.write(fd, string[, position[, encoding]], callback)`
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validateStringAfterArrayBufferView(buffer, "buffer");
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if (typeof buffer !== "string") {
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showStringCoercionDeprecation();
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}
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if (typeof position !== "function") {
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if (typeof offset === "function") {
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position = offset;
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offset = null;
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} else {
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position = length;
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}
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length = "utf-8";
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}
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const str = String(buffer);
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validateEncoding(str, length);
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callback = maybeCallback(position);
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buffer = Buffer.from(str, length);
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innerWrite(fd, buffer, 0, buffer.length, offset, callback).then(
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(nwritten) => {
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callback(null, nwritten, buffer);
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},
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(err) => callback(err),
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);
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}
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