Base 64 Encoding/Decoding

gistfile1.m

+ (NSData *)dataWithBase64EncodedString:(NSString *)base64String
{
    NSData *retVal = nil;
    
    if([base64String canBeConvertedToEncoding:NSASCIIStringEncoding])
    {
        NSData *stringData = [base64String dataUsingEncoding: NSASCIIStringEncoding];
        
        /* base64 decode
         *  in    -- input data
         *  inlen  -- length of input data
         *  out    -- output data (may be same as in, must have enough space)
         *  outmax  -- max size of output buffer
         * result:
         *  outlen -- actual output length
         *
         * returns SASL_BADPROT on bad base64,
         *  SASL_BUFOVER if result won't fit
         *  SASL_OK on success
         */
        
        char *buffer = malloc([stringData length]);
        unsigned actualLength = 0;

        int status = sasl_decode64([stringData bytes], [stringData length], buffer, [stringData length], &actualLength);
        
        if (SASL_OK == status)
        {
            retVal = [NSData dataWithBytesNoCopy:buffer length:actualLength];
        }
    }
    return retVal;
}

- (NSString *)base64Encoding
{
    NSString* retVal = nil;
    /* base64 encode
     *  in      -- input data
     *  inlen  -- input data length
     *  out    -- output buffer (will be NUL terminated)
     *  outmax  -- max size of output buffer
     * result:
     *  outlen  -- gets actual length of output buffer (optional)
     * 
     * Returns SASL_OK on success, SASL_BUFOVER if result won't fit
     */
    
    int bufSize = 4 * [self length] / 3 + 100;
    char *buffer = malloc(bufSize);
    unsigned actualLength = 0;
    int status = sasl_encode64([self bytes], [self length], buffer, bufSize, &actualLength);     
    
    if (SASL_OK == status)
    {
        retVal = [[[NSString alloc] initWithBytes: buffer length: actualLength encoding: NSASCIIStringEncoding] autorelease];

    }
    // Clean up
    free(buffer);
    return retVal;    
}