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denoland-deno/ext/node/polyfills/internal_binding/node_file.ts
2024-09-05 20:37:28 +10:00

89 lines
3.1 KiB
TypeScript

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// This module ports:
// - https://github.com/nodejs/node/blob/master/src/node_file-inl.h
// - https://github.com/nodejs/node/blob/master/src/node_file.cc
// - https://github.com/nodejs/node/blob/master/src/node_file.h
// TODO(petamoriken): enable prefer-primordials for node polyfills
// deno-lint-ignore-file prefer-primordials
import { assert } from "ext:deno_node/_util/asserts.ts";
import * as io from "ext:deno_io/12_io.js";
import { op_fs_seek_sync } from "ext:core/ops";
/**
* Write to the given file from the given buffer synchronously.
*
* Implements sync part of WriteBuffer in src/node_file.cc
* See: https://github.com/nodejs/node/blob/e9ed113/src/node_file.cc#L1818
*
* @param fs file descriptor
* @param buffer the data to write
* @param offset where in the buffer to start from
* @param length how much to write
* @param position if integer, position to write at in the file. if null, write from the current position
* @param context context object for passing error number
*/
export function writeBuffer(
fd: number,
buffer: Uint8Array,
offset: number,
length: number,
position: number | null,
ctx: { errno?: number },
) {
assert(offset >= 0, "offset should be greater or equal to 0");
assert(
offset + length <= buffer.byteLength,
`buffer doesn't have enough data: byteLength = ${buffer.byteLength}, offset + length = ${
offset +
length
}`,
);
if (position) {
op_fs_seek_sync(fd, position, io.SeekMode.Current);
}
const subarray = buffer.subarray(offset, offset + length);
try {
return io.writeSync(fd, subarray);
} catch (e) {
ctx.errno = extractOsErrorNumberFromErrorMessage(e);
return 0;
}
}
function extractOsErrorNumberFromErrorMessage(e: unknown): number {
const match = e instanceof Error
? e.message.match(/\(os error (\d+)\)/)
: false;
if (match) {
return +match[1];
}
return 255; // Unknown error
}