So the do/while loop is infinite, as I have been told before. Is there a better way to implement this loop?

typedef uint8_t BYTE;

int main(void) {

FILE* file = fopen("card.raw", "r");
if (file == NULL)
{
    printf("Doesnt work dog\n");
    return 1;
}

FILE* img = NULL;
int jpgnum = 1;
BYTE buffer[512];
//read until first jpg
do
{
    BYTE buffer[512];
    fread(buffer, sizeof(buffer) , 1, file);
}
while (buffer[0] != 0xff && buffer[1] != 0xd8 && buffer[2] != 0xff && (buffer[3] != 0xe0 || buffer[3] != 0xe1));

while (!feof(file))
{
   BYTE buffer[512];
   char jpgname[8];

   // finding a new jpg
   if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] == 0xe0 || buffer[3] == 0xe1))
   {
        if (img != NULL)
        {
            fclose(img);
        }
        sprintf(jpgname, "%03d.jpg", jpgnum);
        img = fopen(jpgname, "w");
        jpgnum++;
        fwrite(buffer, sizeof(buffer), 1, img);
   }
fwrite(buffer, sizeof(buffer), 1, img);    
}
fclose(img);
fclose(file);
return 0;

}

So the do/while loop is infinite, as I have been told before. Is there a better way to implement this loop?

typedef uint8_t BYTE;

int main(void)
{

FILE* file = fopen("card.raw", "r");
if (file == NULL)
{
    printf("Doesnt work dog\n");
    return 1;
}

FILE* img = NULL;
int jpgnum = 1;
BYTE buffer[512];
//read until first jpg
do
{
    BYTE buffer[512];
    fread(buffer, sizeof(buffer) , 1, file);
}
while (buffer[0] != 0xff && buffer[1] != 0xd8 && buffer[2] != 0xff && (buffer[3] != 0xe0 || buffer[3] != 0xe1));

while (!feof(file))
{
   BYTE buffer[512];
   char jpgname[8];

   // finding a new jpg
   if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] == 0xe0 || buffer[3] == 0xe1))
   {
        if (img != NULL)
        {
            fclose(img);
        }
        sprintf(jpgname, "%03d.jpg", jpgnum);
        img = fopen(jpgname, "w");
        jpgnum++;
        fwrite(buffer, sizeof(buffer), 1, img);
   }
fwrite(buffer, sizeof(buffer), 1, img);    
}
fclose(img);
fclose(file);
return 0;
}