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89 lines
3.1 KiB
TypeScript
89 lines
3.1 KiB
TypeScript
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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// This module ports:
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// - https://github.com/nodejs/node/blob/master/src/node_file-inl.h
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// - https://github.com/nodejs/node/blob/master/src/node_file.cc
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// - https://github.com/nodejs/node/blob/master/src/node_file.h
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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import { assert } from "ext:deno_node/_util/asserts.ts";
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import * as io from "ext:deno_io/12_io.js";
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import * as fs from "ext:deno_fs/30_fs.js";
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/**
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* Write to the given file from the given buffer synchronously.
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*
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* Implements sync part of WriteBuffer in src/node_file.cc
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* See: https://github.com/nodejs/node/blob/e9ed113/src/node_file.cc#L1818
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*
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* @param fs file descriptor
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* @param buffer the data to write
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* @param offset where in the buffer to start from
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* @param length how much to write
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* @param position if integer, position to write at in the file. if null, write from the current position
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* @param context context object for passing error number
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*/
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export function writeBuffer(
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fd: number,
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buffer: Uint8Array,
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offset: number,
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length: number,
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position: number | null,
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ctx: { errno?: number },
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) {
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assert(offset >= 0, "offset should be greater or equal to 0");
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assert(
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offset + length <= buffer.byteLength,
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`buffer doesn't have enough data: byteLength = ${buffer.byteLength}, offset + length = ${
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offset +
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length
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}`,
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);
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if (position) {
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fs.seekSync(fd, position, io.SeekMode.Current);
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}
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const subarray = buffer.subarray(offset, offset + length);
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try {
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return io.writeSync(fd, subarray);
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} catch (e) {
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ctx.errno = extractOsErrorNumberFromErrorMessage(e);
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return 0;
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}
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}
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function extractOsErrorNumberFromErrorMessage(e: unknown): number {
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const match = e instanceof Error
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? e.message.match(/\(os error (\d+)\)/)
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: false;
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if (match) {
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return +match[1];
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}
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return 255; // Unknown error
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}
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