Cisco Systems WVC80N manual Base-64 Encoder/Decoder Sample Codes

Appendix D

CGI Commands

Base-64 Encoder/Decoder Sample Codes

//Standard BASE64 table

//char keyStr[] = “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=”;

//SerComm BASE64 table

char keyStr[] = “ACEGIKMOQSUWYBDFHJLNPRTVXZacegikmoqsuwybdfhjlnprtvxz0246813579=+/”;

//--------------------------------------------------------------------

//Description: Encrypt the input data with the base64

//Input:

//	char i_buf[]	- input buffer
// Output:
//	char o_buf[]	- output buffer
// Return:
//	encrypted string length
//--------------------------------------------------------------------

int encode64(char i_buf[], char o_buf[])

{

char chr1 = (char)0; char chr2 = (char)0; char chr3 = (char)0;

//These are the 3 bytes to be encoded

int enc1 = 0; int enc2 = 0; int enc3 = 0;

int enc4 = 0; //These are the 4 encoded bytes int i = 0, j = 0; //Position counter

do { //Set up the loop here

chr1 = i_buf[i++]; //Grab the first byte

if(i < strlen(i_buf))

chr2 = i_buf[i++]; //Grab the second byte

if(i < strlen(i_buf))

chr3 = i_buf[i++]; //Grab the third byte

//Here is the actual base64 encode part. //There really is only one way to do it.

enc1 = chr1 >> 2;

enc2 = ((chr1 & 3) << 4) (chr2 >> 4); enc3 = ((chr2 & 15) << 2) (chr3 >> 6); enc4 = chr3 & 63;

if(chr2 == (char)0) {

enc3 = enc4 = 64;

}

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