summaryrefslogtreecommitdiffstats
path: root/Utilities/cmcurl/escape.c
blob: 2b9a883fed12784b4550ba9a8ffedecfe51c621c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/***************************************************************************
 *                                  _   _ ____  _
 *  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 "curl_memory.h"

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* The last #include file should be: */
#include "memdebug.h"

char *curl_escape(const char *string, int inlength)
{
  size_t alloc = (inlength?(size_t)inlength:strlen(string))+1;
  char *ns;
  char *testing_ptr;
  unsigned char in;
  size_t newlen = alloc;
  int strindex=0;
  size_t length;

  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);
}