Doc.txt

var png = new byte[] { 137, 80, 78, 71 };    // PNG
var tiff = new byte[] { 73, 73, 42 };         // TIFF
var tiff2 = new byte[] { 77, 77, 42 };         // TIFF
var jpeg = new byte[] { 255, 216, 255, 224 }; // jpeg
var jpeg2 = new byte[] { 255, 216, 255, 225 }; // jpeg canon

Byte 	1 	2 	3
Hex 	47 	49 	46
Char 	G 	I 	F

// BMP
Byte 	1 	2
Hex 	42 	4D
Char 	B 	M

Lire les 4 premiers octets.

/*******************************************************
*** This program permit to automaticaly rename files
*** according to their types. It detect only image files.
*** TO-DO:
*** -Detect file type -DONE
*** -Rename it according to type detected
*** -Check if it does not have an extension -PARTIALY DONE
*** -add launch options:
***     -force file detection (check even if it has an
***     extension) by argv or by command
***     -if argv contains file name, only check the file
***     -if argv contains folder name, check folder only
********************************************************/