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