How do figure out the endianness of a JPG?

[jawdirk]

Is there an easy method, using a Hex-editor, say, to discover the endianness of a JPG?

Thanks.

[AHunter3]

Didn’t know it varied. I’ve never had a graphic program offer me the option, or something likely to be its equivalent (i.e., “Windows byte-order” versus “Mac byte-order” or something akin to that).

What would cause a JPEG to be little-endianned as opposed to big-endianned in the first place?

Or are you asking, not for “a given JPEG”, but rather “for all JPEGs in general”, i.e., “what’s the standard byte-order of these puppies”?

[Bytegeist]

According to this guy, as well as several other pages covering the format, the integer fields inside a JPEG file are all big-endian. (The most significant bytes precede the less significant ones).

[Muffin]

Status or non-status?

[astro]

A Sample JPEG Image File Data structure.

JPEG / JFIF image file format

File structure
A JPEG bitstream is a sequence of data chunks, each chunk starts with a marker value. A marker is a 16 bit integer value, stored in big endian byte order, with the most significant byte set to 0xff. The lower byte of the marker value determines its type. A marker is followed by a 16 bit integer value for the size.

[Polycarp]

So a corrupted JPEG file could be referred to as Blefuscated?

[jawdirk]

Thanks for all your answers. That is very helpful.

Andrew