91 lines
3.3 KiB
JavaScript
Executable File
91 lines
3.3 KiB
JavaScript
Executable File
/* adler32.js (C) 2014-present SheetJS -- http://sheetjs.com */
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/* eslint-env node */
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/* vim: set ts=2 ft=javascript: */
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/*jshint node:true */
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/// <reference types="../node_modules/@types/node/" />
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/* node type definition is missing writable stream _writev */
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interface Chunk { chunk: any; encoding: string; }
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type CBType = () => void;
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import X = require("adler-32");
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import 'exit-on-epipe';
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import fs = require('fs');
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import stream = require('stream');
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import { sprintf } from "printj";
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const help = (): number => {
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[
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"usage: adler32 [options] [filename]",
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"",
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"Options:",
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" -h, --help output usage information",
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" -V, --version output the version number",
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" -S, --seed=<n> use integer seed as starting value (default 1)",
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" -H, --hex-seed=<h> use hex seed as starting value (default 1)",
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" -d, --signed print result with format `%d` (default)",
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" -u, --unsigned print result with format `%u`",
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" -x, --hex print result with format `%0.8x`",
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" -X, --HEX print result with format `%0.8X`",
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" -F, --format=<s> use specified printf format",
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"",
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"Set filename = '-' or pipe data into adler32 to read from stdin",
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"Default output mode is signed (-d)",
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""
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].forEach(function(l) { console.log(l); });
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return 0;
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};
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const version = (): number => { console.log(X.version); return 0; };
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const die = (msg: string, ec?: number): void => { console.error(msg); process.exit(ec || 0); };
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const args/*:Array<string>*/ = process.argv.slice(2);
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let filename/*:string*/ = "";
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let fmt/*:string*/ = "";
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let seed = 0, r = 10;
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for(let i = 0; i < args.length; ++i) {
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const arg = args[i];
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if(arg.charCodeAt(0) !== 45) { if(filename === "") filename = arg; continue; }
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const m = arg.indexOf("=") === -1 ? arg : arg.substr(0, arg.indexOf("="));
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switch(m) {
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case "-": filename = "-"; break;
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case "--help": case "-h": process.exit(help()); break;
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case "--version": case "-V": process.exit(version()); break;
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case "--signed": case "-d": fmt = "%d"; break;
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case "--unsigned": case "-u": fmt = "%u"; break;
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case "--hex": case "-x": fmt = "%0.8x"; break;
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case "--HEX": case "-X": fmt = "%0.8X"; break;
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case "--format": case "-F":
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fmt = ((m!==arg) ? arg.substr(m.length+1) : args[++i])||""; break;
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case "--hex-seed": case "-H": r = 16;
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/* falls through */
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case "--seed": case "-S":
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seed=parseInt((m!==arg) ? arg.substr(m.length+1) : args[++i], r)||0; break;
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default: die("adler32: unrecognized option `" + arg + "'", 22);
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}
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}
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if(!process.stdin.isTTY) filename = filename || "-";
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if(filename.length===0) die("adler32: must specify a filename ('-' for stdin)",1);
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let adler32 = seed;
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// $FlowIgnore -- Writable is callable but type sig disagrees
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const writable = new stream.Writable();
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writable._write = (chunk: any, e: string, cb: CBType) => { adler32 = X.buf(chunk, adler32); cb(); };
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(<any>writable)._writev = (chunks: Chunk[], cb: CBType) => {
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chunks.forEach(function(c) { adler32 = X.buf(c.chunk, adler32);}); cb();
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};
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writable.on('finish', () => {
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console.log(fmt === "" ? adler32 : sprintf(fmt, adler32));
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});
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if(filename === "-") process.stdin.pipe(writable);
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else if(fs.existsSync(filename)) fs.createReadStream(filename).pipe(writable);
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else die("adler32: " + filename + ": No such file or directory", 2);
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