C read X bytes from a file, padding if needed
- by Hunter McMillen
I am trying to read in an input file 64 bits at a time, then do some calculations on those 64 bits, the problem is I need to convert the ascii text to hexadecimal characters. I have searched around but none of the answers posted seem to work for my situation.
Here is what I have:
int main(int argc, int * argv)
{
char buffer[9];
FILE *f;
unsigned long long test;
if(f = fopen("input2.txt", "r"))
{
while( fread(buffer, 8, 1, f) != 0) //while not EOF read 8 bytes at a time
{
buffer[8] = '\0';
test = strtoull(buffer, NULL, 16); //interpret as hex
printf("%llu\n", test);
printf("%s\n", buffer);
}
fclose(f);
}
}
For an input like this:
"testing string to hex conversion"
I get results like this:
0
testing
0
string t
0
o hex co
0 nversion
Where I would expect:
74 65 73 74 69 6e 67 20 <- "testing" in hex
testing
73 74 72 69 6e 67 20 74 <- "string t" in hex
string t
6f 20 68 65 78 20 63 6f <- "o hex co" in hex
o hex co
6e 76 65 72 73 69 6f 6e <- "nversion" in hex
nversion
Can anyone see where I misstepped?
