Detects if a file is binary in Node.js. Similar to Perl's -B switch, in that:
- it reads the first few thousand bytes of a file
- checks for a
nullbyte; if it's found, it's binary - flags non-ASCII characters. After a certain number of "weird" characters, the file is flagged as binary
All the logic is also pretty much ported from ag.
Note: if the file doesn't exist or it is empty, this function returns false.
npm install isBinaryFile
If you pass in one argument, this module assumes it's just the file path, and performs the appropriate file read and stat functionality internally:
var isBinaryFile = require("isbinaryfile");
if (isBinaryFile(process.argv[2]))
console.log("It is!")
else
console.log("No.")Ta da.
However, if you've already read and stat()-ed a file (for some other reason), you can pass in both the file's raw data and the stat's size info to save time:
fs.readFile(process.argv[2], function(err, data) {
fs.lstat(process.argv[2], function(err, stat) {
if (isBinaryFile(data, stat))
console.log("It is!")
else
console.log("No.")
});
});Install mocha on your machine:
npm install mocha -g
Then go into the tests directory, and type mocha test.js.