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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
/* Escape and unescape URL encoding in strings. The functions return a new
* allocated string or NULL if an error occurred. */
#include "setup.h"
#include <ctype.h>
#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "memory.h"
/* The last #include file should be: */
#include "memdebug.h"
char *curl_escape(const char *string, int length)
{
size_t alloc = (length?(size_t)length:strlen(string))+1;
char *ns;
char *testing_ptr = NULL;
unsigned char in;
size_t newlen = alloc;
int strindex=0;
ns = malloc(alloc);
if(!ns)
return NULL;
length = alloc-1;
while(length--) {
in = *string;
if(!(in >= 'a' && in <= 'z') &&
!(in >= 'A' && in <= 'Z') &&
!(in >= '0' && in <= '9')) {
/* encode it */
newlen += 2; /* the size grows with two, since this'll become a %XX */
if(newlen > alloc) {
alloc *= 2;
testing_ptr = realloc(ns, alloc);
if(!testing_ptr) {
free( ns );
return NULL;
}
else {
ns = testing_ptr;
}
}
snprintf(&ns[strindex], 4, "%%%02X", in);
strindex+=3;
}
else {
/* just copy this */
ns[strindex++]=in;
}
string++;
}
ns[strindex]=0; /* terminate it */
return ns;
}
#define ishex(in) ((in >= 'a' && in <= 'f') || \
(in >= 'A' && in <= 'F') || \
(in >= '0' && in <= '9'))
char *curl_unescape(const char *string, int length)
{
int alloc = (length?length:(int)strlen(string))+1;
char *ns = malloc(alloc);
unsigned char in;
int strindex=0;
long hex;
if( !ns )
return NULL;
while(--alloc > 0) {
in = *string;
if(('%' == in) && ishex(string[1]) && ishex(string[2])) {
/* this is two hexadecimal digits following a '%' */
char hexstr[3];
char *ptr;
hexstr[0] = string[1];
hexstr[1] = string[2];
hexstr[2] = 0;
hex = strtol(hexstr, &ptr, 16);
in = (unsigned char)hex; /* this long is never bigger than 255 anyway */
string+=2;
alloc-=2;
}
ns[strindex++] = in;
string++;
}
ns[strindex]=0; /* terminate it */
return ns;
}
/* For operating systems/environments that use different malloc/free
ssystems for the app and for this library, we provide a free that uses
the library's memory system */
void curl_free(void *p)
{
if(p)
free(p);
}
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