mmmagic

Description
===========

An async libmagic binding for node.js for detecting content types by data inspection.


Requirements
============

* node.js -- v4.0.0 or newer

Install
=======

npm install mmmagic

Examples
========

* Get general description of a file:
``javascript
var Magic = require('mmmagic').Magic;

var magic = new Magic();
magic.detectFile('node_modules/mmmagic/build/Release/magic.node', function(err, result) {
if (err) throw err;
console.log(result);
// output on Windows with 32-bit node:
// PE32 executable (DLL) (GUI) Intel 80386, for MS Windows
});
`
* Get mime type for a file:
`javascript
var mmm = require('mmmagic'),
Magic = mmm.Magic;

var magic = new Magic(mmm.MAGIC_MIME_TYPE);
magic.detectFile('node_modules/mmmagic/build/Release/magic.node', function(err, result) {
if (err) throw err;
console.log(result);
// output on Windows with 32-bit node:
// application/x-dosexec
});
`
* Get mime type and mime encoding for a file:
`javascript
var mmm = require('mmmagic'),
Magic = mmm.Magic;

var magic = new Magic(mmm.MAGIC_MIME_TYPE | mmm.MAGIC_MIME_ENCODING);
// the above flags can also be shortened down to just: mmm.MAGIC_MIME
magic.detectFile('node_modules/mmmagic/build/Release/magic.node', function(err, result) {
if (err) throw err;
console.log(result);
// output on Windows with 32-bit node:
// application/x-dosexec; charset=binary
});
`
* Get general description of the contents of a Buffer:
`javascript
var Magic = require('mmmagic').Magic;

var magic = new Magic(),
buf = new Buffer('import Options\nfrom os import unlink, symlink');

magic.detect(buf, function(err, result) {
if (err) throw err;
console.log(result);
// output: Python script, ASCII text executable
});
`

API
===

Magic methods
-------------

(constructor)([< _mixed_ >magicSource][, < _Integer_ >flags]) - Creates and returns a new Magic instance. magicSource (if specified) can either be a path string that points to a (compatible) magic file to use or* it can be a _Buffer_ containing the contents of a (compatible) magic file. If magicSource is not a string and not false, the bundled magic file will be used. If magicSource is false, mmmagic will default to searching for a magic file to use (order of magic file searching: MAGIC env var -> various file system paths (see man file)). flags is a bitmask with the following valid values (available as constants on require('mmmagic')`):

* MAGIC\_NONE - No flags set
* MAGIC\_DEBUG - Turn on debugging
* MAGIC\_SYMLINK - Follow symlinks (default for non-Windows)
* MAGIC\_DEVICES - Look at the contents of devices
* MAGIC\_MIME_TYPE - Return the MIME type
* MAGIC\_CONTINUE - Return all matches (returned as an array of strings)
* MAGIC\_CHECK - Print warnings to stderr
* MAGIC\_PRESERVE\_ATIME - Restore access time on exit
* MAGIC\_RAW - Don't translate unprintable chars
* MAGIC\_MIME\_ENCODING - Return the MIME encoding
* MAGIC\_MIME - (MAGIC\_MIME\_TYPE | MAGIC\_MIME\_ENCODING)
* MAGIC\_APPLE - Return the Apple creator and type
* MAGIC\_NO\_CHECK\_TAR - Don't check for tar files
* MAGIC\_NO\_CHECK\_SOFT - Don't check magic entries
* MAGIC\_NO\_CHECK\_APPTYPE - Don't check application type
* MAGIC\_NO\_CHECK\_ELF - Don't check for elf details
* MAGIC\_NO\_CHECK\_TEXT - Don't check for text files
* MAGIC\_NO\_CHECK\_CDF - Don't check for cdf files
* MAGIC\_NO\_CHECK\_TOKENS - Don't check tokens
* MAGIC\_NO\_CHECK\_ENCODING - Don't check text encodings

* detectFile(< _String_ >path, < _Function_ >callback) - _(void)_ - Inspects the file pointed at by path. The callback receives two arguments: an < _Error_ > object in case of error (null otherwise), and a < _String_ > containing the result of the inspection.

* detect(< _Buffer_ >data, < _Function_ >callback) - _(void)_ - Inspects the contents of data. The callback receives two arguments: an < _Error_ > object in case of error (null otherwise), and a < _String_ > containing the result of the inspection.