Felixlib

My own simple C library with the following functions:

int toint(const char *string) - Converts a string to an int
int pow(const int base, int exp) - Calculates base to the power of exp
int getsize(const char *string) - Returns the size of the input string
**char strsplit(const char *string, const char *splitchar) - Splits the input string every time splitchar is found
char *tobinary(int dec) - Convert a number from decimal to binary
int todecimal(const char *bin) - Convert a number from binary to decimal
char *tobase64(const char *bin) - Converts a string of binary numbers to base64 (This function is not completed yet. It doesn't work for every string)

Convert a String to base64

First you need to convert every character of the string to binary. So you take the ascii numbers and convert them to binary with the function tobinary(). Then you have to combine all binary numbers into one string and call the tobase64() function with it.

Example

int main(void) {
    char buf[256], *binbuf, *b64string;
    
    //Read input string
    scanf("%s", buf);

	//As the binary strings are 8 characters each we need to multiply
	//the number of characters with 8
	binbuf = malloc(sizeof(char) * strlen(buf) * 8);

	//Convert every character to a binary string
	//and add all binary representations to a string
	for (int i = 0; i < strlen(buf); i++) {
		if (i == 0) {
			strcpy(binbuf, tobinary(buf[i]));
		} else {
			strcat(binbuf, tobinary(buf[i]));
		}
	}
	
	//Convert the long binary string to base64 and print it
	b64string = tobase64(binbuf);
	printf("%s -> %s\n", buf, b64string);

	return 0;
}

failex234/felixlib

Felixlib

Convert a String to base64