You can see right away that's not what you want to do and you immediately see also that it's not even possible: the decimal value 67 needs seven bits and won't fit in your four bits of "1100". When you "convert" that 1100 to hex the way you want to do it, you replace it by the ASCII character 'C', whose decimal value is 67. To put it another way: hex representation is for human consumption only, unsuitable (almost always) for program use.įor an example: suppose your pdf file holds a four-bit string "1100," whose human-readable hex representation can be 'C'. See, hex exists only as a human-readable presentation format for binary, each hex digit representing four contiguous binary digits. You must abandon, delete, discard, defenestrate, forget about, and expunge your notion of "converting" any binary file to anything else. You don't "convert" anything, not unless you want to change the binary! A pdf file is a binary file is a binary file. If you think, as you seem to, that you have to "convert" a pdf file to hex, then you are mistaken. You have to first understand and internalize the idea that hex notation is only an easy-to-read representation of binary. You don't have to, and must not, write any such conversion program. But firstly I have to write a program, that will convert this file to hex file." Next, we open our sample.txt file with vim: vim sample.txt. First, let’s install the editor: sudo apt-get install vim. It has some handy built-in commands to get the hex dump of files. You said: "I' d like to upload file on server, for example pdf file. We can also use vim with just about any file format.
I still claim the exercise is a complete waste of time,since blobs can contain binary data: that's what blobs were invented for. He wants to convert his pdf file to its hex representation, as I see now, because he wants to put that file in a text blob field in some database table. After that, I will upload this file line by line with PL/SQL.ĮDIT: I completely misunderstood what the OP was aiming for. I'd like that the length of a line in hex file would be equal 1024. But firstly I have to write a program, that will convert this file to a hex file.
I' d like to upload a file on server, for example a PDF file.
After invoking this code I have still strange characters in my file_test file. N = fread(buffer, 1, bufferSize, source) I have written something, but it does not work properly. I' d like to convert binary files to hex. You'd have to test on the target system.I am trying to write some simple program to uploading files to my server. POSIXly (and only using a common subset compatible with busybox (or at least the busybox as built for the current busybox Debian package):įor (i = 0 i 1 'Īgain, tested only with Debian's busybox, I can't tell how much of that is dependant on some busybox compile-time option or another.
0 kommentar(er)
