[C] Programming problem: Storing values of an array in one variable
- by OldMacDonald
Hello,
I am trying to use md5 code to calculate checksums of file. Now the given function prints out the (previously calculated) checksum on screen, but I want to store it in a variable, to be able to compare it later on.
I guess the main problem is that I want to store the content of an array in one variable.
How can I manage that?
Probably this is a very stupid question, but maybe somone can help.
Below is the function to print out the value. I want to modify it to store the result in one variable.
static void MDPrint (mdContext)
MD5_CTX *mdContext;
{
int i;
for (i = 0; i < 16; i++)
{
printf ("%02x", mdContext->digest[i]);
} // end of for
} // end of function
For reasons of completeness the used struct:
/* typedef a 32 bit type */
typedef unsigned long int UINT4;
/* Data structure for MD5 (Message Digest) computation */
typedef struct {
UINT4 i[2]; /* number of _bits_ handled mod 2^64 */
UINT4 buf[4]; /* scratch buffer */
unsigned char in[64]; /* input buffer */
unsigned char digest[16]; /* actual digest after MD5Final call */
} MD5_CTX;
and the used function to calculate the checksum:
static int MDFile (filename)
char *filename;
{
FILE *inFile = fopen (filename, "rb");
MD5_CTX mdContext;
int bytes;
unsigned char data[1024];
if (inFile == NULL) {
printf ("%s can't be opened.\n", filename);
return -1;
} // end of if
MD5Init (&mdContext);
while ((bytes = fread (data, 1, 1024, inFile)) != 0)
MD5Update (&mdContext, data, bytes);
MD5Final (&mdContext);
MDPrint (&mdContext);
printf (" %s\n", filename);
fclose (inFile);
return 0;
}
