What data structure do I use to store the 512B blocks in a buffer?
Thinking about an array or ints? Or am I completely off?
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Do you try to update appliance with update50 ?– Teodor Ilkov NikolovCommented Sep 6, 2014 at 15:09
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Ah sorry if I was't clear, I was working on recover from pset5!– JesseCommented Sep 6, 2014 at 16:07
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1 Answer
You definitely need to store it in an array. However, think about the size each element in that array should have. An int usually has 4 bytes. What you want is to look for jpg signatures, which are 4 bytes at the beginning of each 512 byte block potentially. In order to store these 4 individual bytes correctly, you need a buffer of a type like this:
BYTE buffer[512];
where BYTE should be defined as having exactly 8 bits, or one byte. Like this:
typedef uint8_t BYTE; (from pset5, bmp.h)
To look for a jpg signature later, you can then easily access the first four bytes by looking at buffer[0], buffer[1], buffer[2], and buffer[3].
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Would I have to include "bmp.h" header file since I'm accessing the typedef struct BYTE?– sisball8Commented Apr 9, 2016 at 14:33
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No, you can write the typedef directly into your recover.c code and create a type without needing to reference other documentation Commented Mar 20, 2017 at 1:51
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Actually, in order to call
uint8_t, you need to#include <stdint.h>– RaoulCommented Sep 15, 2019 at 13:51