Detects if a file is binary in Node.js. Similar to Perl's -B.
npm install @aleclarson/isbinaryfileDetects 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 null byte; if it's found, it's binary
- flags non-ASCII characters. After a certain number of "weird" characters, the file is flagged as binary
Much of the logic is pretty much ported from ag.
Note: if the file doesn't exist, is a directory, or is empty, the function returns false.
``
npm install isbinaryfile
* filepath, a string indicating the path to the file.callback
* , a function for the callback. It has two arguments:err
- , the typical Node.js error argumentresult
- , a boolean of true or false, depending on if the file is binary
* bytes, a Buffer of the file's contents.size
* , an optional number indicating the file size.callback
* , a function for the callback. It has two arguments:err
- , the typical Node.js error argumentresult
- , a boolean of true or false, depending on if the file is binary
* filepath, a string indicating the path to the file.
* bytes, a Buffer of the file's contents.size
* , an number indicating the file size.
Returns a boolean of true or false, depending on if the file is binary.
`javascript
var isBinaryFile = require("isbinaryfile");
fs.readFile("some_file", function(err, data) {
fs.lstat("some_file", function(err, stat) {
isBinaryFile(data, stat.size, function (err, result) {
if (!err) {
if (result) {
console.log("It is!")
}
else {
console.log("No.")
}
}
});
});
});
isBinaryFile.sync("some_file"); // true or false
var bytes = fs.readFileSync(("some_file"));
var size = fs.lstatSync(("some_file").size;
isBinaryFile.sync(bytes, size); // true or false
`
Run npm install to install mocha, then run npm test`.