i am a hobby php-dev and have the following problem:i have a rar-file, whose header is damaged, therefor extracting is not fully possible. the contents are non-compressed, and can be read with eg. a hex-editor. the archive contains jpeg-files, but because of the damaged header, some of them are not extractable in winrar. i have tried repairing, but a good portion of the file remains broken.i want to read the file in, and look for the bytes that indicate start and end of a jpeg (from what i know they are FFD8FF for start and FFD9FF for end). using a hex-editor i have managed to find some of those bytes, and also extracting the image into a file and view it does work. since the file is 500mb, i want to do this automatically, and since i am php-friendly, i would like to do it there :-)i know how to read a file bytewise (fread), what i am having difficulties is, parsing the file correctly in hex, so i can identify the starts and ends. what i am thinking about is something like this (in pseudocode):while( READ FILE UNTIL EOF ){    if( CURRENTBYTES == FFD8FF ){        $jpeg_file = READ FILE UNTIL CURRENTBYTES == FFD9FF        fwrite($jpeg_file, xyz.jpg);        // return to while, looking for next FFD8FF    }}could someone give me a hint, how the reading and identifying would be done best? the main question is, how can i read a file until a start-byte, then save the following, then look for the next start-byte? efficiency, security, code beauty are no concern, i just want all the pics :-)many thanx for any helps
read file bytewise and find information
php;byte