示例#1
0
/*
 * Curl_urldecode() URL decodes the given string.
 *
 * Optionally detects control characters (byte codes lower than 32) in the
 * data and rejects such data.
 *
 * Returns a pointer to a malloced string in *ostring with length given in
 * *olen. If length == 0, the length is assumed to be strlen(string).
 *
 */
CURLcode Curl_urldecode(struct SessionHandle *data,
                        const char *string, size_t length,
                        char **ostring, size_t *olen,
                        bool reject_ctrl)
{
  size_t alloc = (length?length:strlen(string))+1;
  char *ns = malloc(alloc);
  unsigned char in;
  size_t strindex=0;
  unsigned long hex;
  CURLcode res;

  if(!ns)
    return CURLE_OUT_OF_MEMORY;

  while(--alloc > 0) {
    in = *string;
    if(('%' == in) && (alloc > 2) &&
       ISXDIGIT(string[1]) && ISXDIGIT(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 = strtoul(hexstr, &ptr, 16);

      in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */

      res = Curl_convert_from_network(data, &in, 1);
      if(res) {
        /* Curl_convert_from_network calls failf if unsuccessful */
        free(ns);
        return res;
      }

      string+=2;
      alloc-=2;
    }
    if(reject_ctrl && (in < 0x20)) {
      free(ns);
      return CURLE_URL_MALFORMAT;
    }

    ns[strindex++] = in;
    string++;
  }
  ns[strindex]=0; /* terminate it */

  if(olen)
    /* store output size */
    *olen = strindex;

  if(ostring)
    /* store output string */
    *ostring = ns;

  return CURLE_OK;
}
示例#2
0
/*
 * Unescapes the given URL escaped string of given length. Returns a
 * pointer to a malloced string with length given in *olen.
 * If length == 0, the length is assumed to be strlen(string).
 * If olen == NULL, no output length is stored.
 */
char *curl_easy_unescape(CURL *handle, const char *string, int length,
                         int *olen)
{
  int alloc = (length?length:(int)strlen(string))+1;
  char *ns = malloc(alloc);
  unsigned char in;
  int strindex=0;
  unsigned long hex;

#ifndef CURL_DOES_CONVERSIONS
  /* avoid compiler warnings */
  (void)handle;
#endif
  if( !ns )
    return NULL;

  while(--alloc > 0) {
    in = *string;
    if(('%' == in) && ISXDIGIT(string[1]) && ISXDIGIT(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 = strtoul(hexstr, &ptr, 16);

      in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */

#ifdef CURL_DOES_CONVERSIONS
/* escape sequences are always in ASCII so convert them on non-ASCII hosts */
      if(!handle ||
          (Curl_convert_from_network(handle, &in, 1) != CURLE_OK)) {
        /* Curl_convert_from_network calls failf if unsuccessful */
        free(ns);
        return NULL;
      }
#endif /* CURL_DOES_CONVERSIONS */

      string+=2;
      alloc-=2;
    }

    ns[strindex++] = in;
    string++;
  }
  ns[strindex]=0; /* terminate it */

  if(olen)
    /* store output size */
    *olen = strindex;
  return ns;
}
示例#3
0
文件: escape.c 项目: 1498636925/curl
/*
 * Unescapes the given URL escaped string of given length. Returns a
 * pointer to a malloced string with length given in *olen.
 * If length == 0, the length is assumed to be strlen(string).
 * If olen == NULL, no output length is stored.
 */
char *curl_easy_unescape(CURL *handle, const char *string, int length,
                         int *olen)
{
  int alloc = (length?length:(int)strlen(string))+1;
  char *ns = malloc(alloc);
  unsigned char in;
  int strindex=0;
  unsigned long hex;
  CURLcode res;

  if(!ns)
    return NULL;

  while(--alloc > 0) {
    in = *string;
    if(('%' == in) && ISXDIGIT(string[1]) && ISXDIGIT(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 = strtoul(hexstr, &ptr, 16);

      in = curlx_ultouc(hex); /* this long is never bigger than 255 anyway */

      res = Curl_convert_from_network(handle, &in, 1);
      if(res) {
        /* Curl_convert_from_network calls failf if unsuccessful */
        free(ns);
        return NULL;
      }

      string+=2;
      alloc-=2;
    }

    ns[strindex++] = in;
    string++;
  }
  ns[strindex]=0; /* terminate it */

  if(olen)
    /* store output size */
    *olen = strindex;
  return ns;
}