has-bytes

Quickly Determine if a File has Certain Byte Sequences

background

You can use this to quickly identify a file type

install

``bash
npm install has-bytes
`

usage

`javascript
const fs = require("fs");
const hasBytes = require("./has-bytes");

const buffer = fs.readFileSync("./data/flower.jpg");
const { result } = hasBytes({
data: buffer,
debug: false, // set debug to true for increased logging
sequences: {
magic: [255, 216, 255], // magic number (including start of file)
EOI: [0xFF, 0xD9] // end of file indicator
}
});
// result is true
``