CMakeLua/Utilities/cmcurl-7.19.0/lib/escape.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  * $Id: escape.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
  22  ***************************************************************************/
  23
  24 /* Escape and unescape URL encoding in strings. The functions return a new
  25  * allocated string or NULL if an error occurred.  */
  26
  27 #include "setup.h"
  28 #include <ctype.h>
  29 #include <curl/curl.h>
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include "memory.h"
  35 /* urldata.h and easyif.h are included for Curl_convert_... prototypes */
  36 #include "urldata.h"
  37 #include "easyif.h"
  38
  39 #define _MPRINTF_REPLACE /* use our functions only */
  40 #include <curl/mprintf.h>
  41
  42 /* The last #include file should be: */
  43 #include "memdebug.h"
  44
  45 /* for ABI-compatibility with previous versions */
  46 char *curl_escape(const char *string, int inlength)
  47 {
  48   return curl_easy_escape(NULL, string, inlength);
  49 }
  50
  51 /* for ABI-compatibility with previous versions */
  52 char *curl_unescape(const char *string, int length)
  53 {
  54   return curl_easy_unescape(NULL, string, length, NULL);
  55 }
  56
  57 char *curl_easy_escape(CURL *handle, const char *string, int inlength)
  58 {
  59   size_t alloc = (inlength?(size_t)inlength:strlen(string))+1;
  60   char *ns;
  61   char *testing_ptr = NULL;
  62   unsigned char in; /* we need to treat the characters unsigned */
  63   size_t newlen = alloc;
  64   int strindex=0;
  65   size_t length;
  66
  67 #ifndef CURL_DOES_CONVERSIONS
  68   /* avoid compiler warnings */
  69   (void)handle;
  70 #endif
  71   ns = malloc(alloc);
  72   if(!ns)
  73     return NULL;
  74
  75   length = alloc-1;
  76   while(length--) {
  77     in = *string;
  78
  79     /* Portable character check (remember EBCDIC). Do not use isalnum() because
  80        its behavior is altered by the current locale. */
  81
  82     switch (in) {
  83     case '0': case '1': case '2': case '3': case '4':
  84     case '5': case '6': case '7': case '8': case '9':
  85     case 'a': case 'b': case 'c': case 'd': case 'e':
  86     case 'f': case 'g': case 'h': case 'i': case 'j':
  87     case 'k': case 'l': case 'm': case 'n': case 'o':
  88     case 'p': case 'q': case 'r': case 's': case 't':
  89     case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
  90     case 'A': case 'B': case 'C': case 'D': case 'E':
  91     case 'F': case 'G': case 'H': case 'I': case 'J':
  92     case 'K': case 'L': case 'M': case 'N': case 'O':
  93     case 'P': case 'Q': case 'R': case 'S': case 'T':
  94     case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
  95       /* just copy this */
  96       ns[strindex++]=in;
  97       break;
  98     default:
  99       /* encode it */
 100       newlen += 2; /* the size grows with two, since this'll become a %XX */
 101       if(newlen > alloc) {
 102         alloc *= 2;
 103         testing_ptr = realloc(ns, alloc);
 104         if(!testing_ptr) {
 105           free( ns );
 106           return NULL;
 107         }
 108         else {
 109           ns = testing_ptr;
 110         }
 111       }
 112
 113 #ifdef CURL_DOES_CONVERSIONS
 114 /* escape sequences are always in ASCII so convert them on non-ASCII hosts */
 115       if(!handle ||
 116           (Curl_convert_to_network(handle, &in, 1) != CURLE_OK)) {
 117         /* Curl_convert_to_network calls failf if unsuccessful */
 118         free(ns);
 119         return NULL;
 120       }
 121 #endif /* CURL_DOES_CONVERSIONS */
 122
 123       snprintf(&ns[strindex], 4, "%%%02X", in);
 124
 125       strindex+=3;
 126       break;
 127     }
 128     string++;
 129   }
 130   ns[strindex]=0; /* terminate it */
 131   return ns;
 132 }
 133
 134 char *curl_easy_unescape(CURL *handle, const char *string, int length,
 135                          int *olen)
 136 {
 137   int alloc = (length?length:(int)strlen(string))+1;
 138   char *ns = malloc(alloc);
 139   unsigned char in;
 140   int strindex=0;
 141   long hex;
 142
 143 #ifndef CURL_DOES_CONVERSIONS
 144   /* avoid compiler warnings */
 145   (void)handle;
 146 #endif
 147   if( !ns )
 148     return NULL;
 149
 150   while(--alloc > 0) {
 151     in = *string;
 152     if(('%' == in) && ISXDIGIT(string[1]) && ISXDIGIT(string[2])) {
 153       /* this is two hexadecimal digits following a '%' */
 154       char hexstr[3];
 155       char *ptr;
 156       hexstr[0] = string[1];
 157       hexstr[1] = string[2];
 158       hexstr[2] = 0;
 159
 160       hex = strtol(hexstr, &ptr, 16);
 161
 162       in = (unsigned char)hex; /* this long is never bigger than 255 anyway */
 163
 164 #ifdef CURL_DOES_CONVERSIONS
 165 /* escape sequences are always in ASCII so convert them on non-ASCII hosts */
 166       if(!handle ||
 167           (Curl_convert_from_network(handle, &in, 1) != CURLE_OK)) {
 168         /* Curl_convert_from_network calls failf if unsuccessful */
 169         free(ns);
 170         return NULL;
 171       }
 172 #endif /* CURL_DOES_CONVERSIONS */
 173
 174       string+=2;
 175       alloc-=2;
 176     }
 177
 178     ns[strindex++] = in;
 179     string++;
 180   }
 181   ns[strindex]=0; /* terminate it */
 182
 183   if(olen)
 184     /* store output size */
 185     *olen = strindex;
 186   return ns;
 187 }
 188
 189 /* For operating systems/environments that use different malloc/free
 190    ssystems for the app and for this library, we provide a free that uses
 191    the library's memory system */
 192 void curl_free(void *p)
 193 {
 194   if(p)
 195     free(p);
 196 }