cspace_utils.c

开源的OpenId的一个java实现

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */



#include <ctype.h>
#include "cspace_utils.h"

/* c should always be a hex digit.*/
int hex2dec(const char c)
{
    /*we need not worry about lower bound since we know it is hex*/

    /*keep the order intact, logic depends on the order*/
    if (c <= '9') {
        return c - '0';
    } else if (c <= 'F') {
        return c - 'A' + 10;
    } else if (c <= 'f') {
        return c - 'a' + 10;
    }
    return 0; /* this should never be reached.*/
}


void cspace_decode_url(char *url)
{
    char *s = url, *d = url; /*source and destination pointers*/

    while (*s) {
        if (*s == '+') { /*this should come first:
                           we don't want to mess with the url encoded '+'s */
            *d = ' ';
        } else if ((*s == '%') && (isxdigit(*(s + 1))) && (isxdigit(*(s + 2)))) {
            *d = (char)(((hex2dec(*(s + 1))) * 16) + hex2dec(*(s + 2)));
            s += 2;
        } else {
            *d = *s;
        }
        d ++;
        s ++;
    }
    *d = '\0';
}