Cant validate whether file being read is JPEG or not in recover

Question

I cannot validate whether the file is JPEG or not with a help of the pattern. Thanks in advance.

Here is my simple code:

typedef uint8_t  BYTE;

int main(int argc, char* argv[])
{

    char* cardName = "card.raw";

    FILE* card = fopen(cardName, "r");

    if(card == NULL)
    {
        printf("Could not open %s.\n", cardName);
        return 2;
    }


    //read till the EOF 
    while(!feof(card)){ 


        BYTE buffer[512];

        int counter = 0;
        int jpegNum = 0;

        while(fread(&buffer, sizeof(BYTE), 1, card) == 1){


    bool isJpeg = (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff);

    isJpeg = isJpeg && (buffer[3] == 0xe1 || buffer[3] == 0xe0);


            while(isJpeg){ 

                **I never get to here** 
                printf("here our %d JPEG",jpegNum); 

        counter++;
    }


    //after reading we are to close the card file
    fclose(card);

}

Answer 1

I don't think that's how booleans work.

It looks like you are trying to declare a function that evaluates to True if the .jpg file header is found. Try using an if statement instead.

if((buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff) && (buffer[3] == 0xe1 || buffer[3] == 0xe0))