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denoland-deno/js/read_file.ts

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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as fbs from "gen/msg_generated";
import { flatbuffers } from "flatbuffers";
import { assert } from "./util";
import * as dispatch from "./dispatch";
/**
* Read the entire contents of a file synchronously.
*
* import { readFileSync } from "deno";
* const decoder = new TextDecoder("utf-8");
* const data = readFileSync("hello.txt");
* console.log(decoder.decode(data));
*/
export function readFileSync(filename: string): Uint8Array {
return res(dispatch.sendSync(...req(filename)));
}
/**
* Read the entire contents of a file.
*
* import { readFile } from "deno";
* const decoder = new TextDecoder("utf-8");
* const data = await readFile("hello.txt");
* console.log(decoder.decode(data));
*/
export async function readFile(filename: string): Promise<Uint8Array> {
return res(await dispatch.sendAsync(...req(filename)));
}
function req(
filename: string
): [flatbuffers.Builder, fbs.Any, flatbuffers.Offset] {
const builder = new flatbuffers.Builder();
const filename_ = builder.createString(filename);
fbs.ReadFile.startReadFile(builder);
fbs.ReadFile.addFilename(builder, filename_);
const msg = fbs.ReadFile.endReadFile(builder);
return [builder, fbs.Any.ReadFile, msg];
}
function res(baseRes: null | fbs.Base): Uint8Array {
assert(baseRes != null);
assert(fbs.Any.ReadFileRes === baseRes!.msgType());
const msg = new fbs.ReadFileRes();
assert(baseRes!.msg(msg) != null);
const dataArray = msg.dataArray();
assert(dataArray != null);
return new Uint8Array(dataArray!);
}