Good website for file specifications?

[Tineras]

Does anyone know of any good websites that list several different file specifications? (ex. .txt, .jpg, .xxx)

I am wanting to read files using binaryreader and want to know which parts of the file contain what information (like file header contents).

Thanks

[gstercken]

Does anyone know of any good websites that list several different file specifications? (ex. .txt, .jpg, .xxx)

You mean file extensions? Here, for example: http://filext.com/

[Tineras]

I'm actually wanting to read and edit the Hex data in the file headers of various file types. For example, if I want to find out the image width of a .jpg file, my program would use BinaryReader to get the Hex info from the file header that tell me that.

[gstercken]

I'm actually wanting to read and edit the Hex data in the file headers of various file types. For example, if I want to find out the image width of a .jpg file, my program would use BinaryReader to get the Hex info from the file header that tell me that.

Sure. But in this case, you need not only know which type of file is behind an extension, but also a the file format (and the site I showed you usually has links to the format descriptions of the various file types). However - there a thousands of different file types - I wonder how you would want to deal with all of them?

[Hermit]

http://www.w3.org/ seems to cover a wide range of file format specifications related to the web. For .jpg files you'd want to look up the JFIF specification.

Anyway, google is your friend, and so are 3rd-party libraries.

[krmed]

Another good resource I use a lot is Wotsit.

Hope it helps.

[srelu]

I tried to find such sites without too much success. Here is the best I found, but only has a handful of file formats:
http://www.daubnet.com/formats/

If you find a better one post it here, I'm curious too.

[Tineras]

Sure. But in this case, you need not only know which type of file is behind an extension, but also a the file format (and the site I showed you usually has links to the format descriptions of the various file types). However - there a thousands of different file types - I wonder how you would want to deal with all of them?

I'm sorry, I didn't know that it had detailed information. I guess I just wasn't paying close attention.

[Tineras]

I surprised there are more databases with this information.

I found some info on http://www.wotsit.org

This is the kind of information I was looking for:

    X'FF', SOI
         X'FF', APP0, length, identifier, version, units, Xdensity, Ydensity, Xthumbnail,
          Ythumbnail, (RGB)n
              length     (2 bytes)  Total APP0 field byte count, including the byte 
                                    count value (2 bytes), but excluding the APP0 
                                    marker itself
              identifier (5 bytes)  = X'4A', X'46', X'49', X'46', X'00' 
                                    This zero terminated string ("JFIF") uniquely 
                                    identifies this APP0 marker.  This string shall 
                                    have zero parity (bit 7=0).
              version    (2 bytes)  = X'0102'
                                    The most significant byte is used for major 
                                    revisions, the least significant byte for minor 
                                    revisions. Version 1.02 is the current released 
                                    revision.
              units      (1 byte)   Units for the X and Y densities.
                                    units = 0:  no units, X and Y specify the pixel 
                                         aspect ratio
                                    units = 1:  X and Y are dots per inch
                                    units = 2:  X and Y are dots per cm
              Xdensity   (2 bytes)  Horizontal pixel density
              Ydensity   (2 bytes)  Vertical pixel density
              Xthumbnail (1 byte)   Thumbnail horizontal pixel count
              Ythumbnail (1 byte)   Thumbnail vertical pixel count
              (RGB)n     (3n bytes) Packed (24-bit) RGB values for the thumbnail 
                                    pixels, n = Xthumbnail * Ythumbnail

Thank you all. I will keep searching too.