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denoland-deno/ext/node/polyfills/internal_binding/node_file.ts
Bartek Iwańczuk b40086fd7d
refactor(core): include_js_files! 'dir' option doesn't change specifiers (#18019)
This commit changes "include_js_files!" macro from "deno_core"
in a way that "dir" option doesn't cause specifiers to be rewritten 
to include it.

Example:
```
include_js_files! {
  dir "js",
  "hello.js",
}
```

The above definition required embedders to use:
`import ... from "internal:<ext_name>/js/hello.js"`. 
But with this change, the "js" directory in which the files are stored
is an implementation detail, which for embedders results in: 
`import ... from "internal:<ext_name>/hello.js"`.

The directory the files are stored in, is an implementation detail and 
in some cases might result in a significant size difference for the 
snapshot. As an example, in "deno_node" extension, we store the 
source code in "polyfills" directory; which resulted in each specifier 
to look like "internal:deno_node/polyfills/<module_name>", but with 
this change it's "internal:deno_node/<module_name>". 

Given that "deno_node" has over 100 files, many of them having 
several import specifiers to the same extension, this change removes
10 characters from each import specifier.
2023-03-05 02:31:38 +00:00

84 lines
2.9 KiB
TypeScript

// Copyright 2018-2023 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
import { assert } from "internal:deno_node/_util/asserts.ts";
/**
* 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) {
Deno.seekSync(fd, position, Deno.SeekMode.Current);
}
const subarray = buffer.subarray(offset, offset + length);
try {
return Deno.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
}