Add Extend functionality and support for .lnk and .xpm formats

Add Extend function. It allows users to detect other file formats not detected by mimetype. See example for usage.

New supported formats:

• .lnk application/x-ms-shortcut
• .xpm image/x-xpixmap

Fixes:

• #152 Check for zip header in chrome extensions
• #145 Add support for other text encodings/charsets

Add SetLimit function and support for 5 other formats

Add SetLimit function. It lets users set the length of the header mimetype reads from the input. Longer headers give better detection results for file formats that keep their magic numbers towards the end of the file.

New supported formats:

• OWL application/owl+xml
• SXC application/vnd.sun.xml.calc
• HDR image/vnd.radiance
• ODC application/x-vnd.oasis.opendocument.chart
• GLB model/gltf-binary

Add support for several formats

Add support for:

• Adobe FDF
• Adobe XFDF
• P7S
• M3U
• CPIO
• TZIF
• Outlook MSG
• GIMP XCF
• GIMP PAT
• GIMP GBR

Add torrent and rmvb support

Add support for torrent and rmvb files.
Ease docx, xlsx and pptx detection for trailing signatures.

Add EqualsAny function

v1.1.0

Add docs for EqualsAny

Add lzip support

Improve zip sub formats detection

Add Performance section in README

Add support for XZ and TTF files

v1.0.4

Use Is method in tests instead of string comparƣson

Behave as http.DetectContentType and return text/plain for empty input

v1.0.3

Behave as http.DetectContentType and return text/plain for empty input

Fix panic in msoXML detection

Add check for input slice capacity in msoXML detection and extend the msoXML check from first 4 local headers to 6.

Add support for Cabinet and UTF-16 files

Add support for:

• application/vnd.ms-cab-compressed
• text/plain; charset=utf-16le
• text/plain; charset=utf-16be