86 lines
3.0 KiB
JavaScript
Executable File
86 lines
3.0 KiB
JavaScript
Executable File
#!/usr/bin/env node
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/* crc32.js (C) 2014-present SheetJS -- http://sheetjs.com */
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/* vim: set ts=2 ft=javascript: */
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var X/*:CRC32Module*/;
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try { X = require('../'); } catch(e) { X = require('crc-32'); }
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function help()/*:number*/ {
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[
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"usage: crc32 [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 (rolling CRC)",
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" -H, --hex-seed=<h> use hex seed as starting value (rolling CRC)",
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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 crc32 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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function version()/*:number*/ { console.log(X.version); return 0; }
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var fs = require('fs');
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require('exit-on-epipe');
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function die(msg/*:string*/, ec/*:?number*/)/*:void*/ { console.error(msg); process.exit(ec || 0); }
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var args/*:Array<string>*/ = process.argv.slice(2);
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var filename/*:string*/ = "";
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var fmt/*:string*/ = "";
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var seed = 0, r = 10;
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for(var i = 0; i < args.length; ++i) {
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var arg = args[i];
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if(arg.charCodeAt(0) != 45) { if(filename === "") filename = arg; continue; }
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var 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("crc32: 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("crc32: must specify a filename ('-' for stdin)",1);
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var crc32 = seed;
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// $FlowIgnore -- Writable is callable but type sig disagrees
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var writable = require('stream').Writable();
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writable._write = function(chunk, e, cb) { crc32 = X.buf(chunk, crc32); cb(); };
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writable._writev = function(chunks, cb) {
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chunks.forEach(function(c) { crc32 = X.buf(c.chunk, crc32);});
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cb();
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};
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writable.on('finish', function() {
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console.log(fmt === "" ? crc32 : require("printj").sprintf(fmt, crc32));
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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("crc32: " + filename + ": No such file or directory", 2);
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