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    1: /***************************************************************************
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    3:  *  Project                     ___| | | |  _ \| |
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    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2019, 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 https://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:  ***************************************************************************/
   22: /* <DESC>
   23:  * This is a simple example showing how a program on a non-ASCII platform
   24:  * would invoke callbacks to do its own codeset conversions instead of
   25:  * using the built-in iconv functions in libcurl.
   26:  * </DESC>
   27:  */
   28: /*
   29: 
   30:    The IBM-1047 EBCDIC codeset is used for this example but the code
   31:    would be similar for other non-ASCII codesets.
   32: 
   33:    Three callback functions are created below:
   34:         my_conv_from_ascii_to_ebcdic,
   35:         my_conv_from_ebcdic_to_ascii, and
   36:         my_conv_from_utf8_to_ebcdic
   37: 
   38:    The "platform_xxx" calls represent platform-specific conversion routines.
   39: 
   40:  */
   41: 
   42: #include <stdio.h>
   43: #include <curl/curl.h>
   44: 
   45: static CURLcode my_conv_from_ascii_to_ebcdic(char *buffer, size_t length)
   46: {
   47:   char *tempptrin, *tempptrout;
   48:   size_t bytes = length;
   49:   int rc;
   50:   tempptrin = tempptrout = buffer;
   51:   rc = platform_a2e(&tempptrin, &bytes, &tempptrout, &bytes);
   52:   if(rc == PLATFORM_CONV_OK) {
   53:     return CURLE_OK;
   54:   }
   55:   else {
   56:     return CURLE_CONV_FAILED;
   57:   }
   58: }
   59: 
   60: static CURLcode my_conv_from_ebcdic_to_ascii(char *buffer, size_t length)
   61: {
   62:   char *tempptrin, *tempptrout;
   63:   size_t bytes = length;
   64:   int rc;
   65:   tempptrin = tempptrout = buffer;
   66:   rc = platform_e2a(&tempptrin, &bytes, &tempptrout, &bytes);
   67:   if(rc == PLATFORM_CONV_OK) {
   68:     return CURLE_OK;
   69:   }
   70:   else {
   71:     return CURLE_CONV_FAILED;
   72:   }
   73: }
   74: 
   75: static CURLcode my_conv_from_utf8_to_ebcdic(char *buffer, size_t length)
   76: {
   77:   char *tempptrin, *tempptrout;
   78:   size_t bytes = length;
   79:   int rc;
   80:   tempptrin = tempptrout = buffer;
   81:   rc = platform_u2e(&tempptrin, &bytes, &tempptrout, &bytes);
   82:   if(rc == PLATFORM_CONV_OK) {
   83:     return CURLE_OK;
   84:   }
   85:   else {
   86:     return CURLE_CONV_FAILED;
   87:   }
   88: }
   89: 
   90: int main(void)
   91: {
   92:   CURL *curl;
   93: 
   94:   curl = curl_easy_init();
   95:   if(curl) {
   96:     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
   97: 
   98:     /* use platform-specific functions for codeset conversions */
   99:     curl_easy_setopt(curl, CURLOPT_CONV_FROM_NETWORK_FUNCTION,
  100:                      my_conv_from_ascii_to_ebcdic);
  101:     curl_easy_setopt(curl, CURLOPT_CONV_TO_NETWORK_FUNCTION,
  102:                      my_conv_from_ebcdic_to_ascii);
  103:     curl_easy_setopt(curl, CURLOPT_CONV_FROM_UTF8_FUNCTION,
  104:                      my_conv_from_utf8_to_ebcdic);
  105: 
  106:     curl_easy_perform(curl);
  107: 
  108:     /* always cleanup */
  109:     curl_easy_cleanup(curl);
  110:   }
  111:   return 0;
  112: }