quickjs-tart

quickjs-based runtime for wallet-core logic
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curl_range.c (3072B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 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.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  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 
     25 #include "curl_setup.h"
     26 #include <curl/curl.h>
     27 #include "curl_range.h"
     28 #include "sendf.h"
     29 #include "curlx/strparse.h"
     30 
     31 /* Only include this function if one or more of FTP, FILE are enabled. */
     32 #if !defined(CURL_DISABLE_FTP) || !defined(CURL_DISABLE_FILE)
     33 
     34  /*
     35   Check if this is a range download, and if so, set the internal variables
     36   properly.
     37  */
     38 CURLcode Curl_range(struct Curl_easy *data)
     39 {
     40   if(data->state.use_range && data->state.range) {
     41     curl_off_t from, to;
     42     bool first_num = TRUE;
     43     const char *p = data->state.range;
     44     if(curlx_str_number(&p, &from, CURL_OFF_T_MAX))
     45       first_num = FALSE;
     46 
     47     if(curlx_str_single(&p, '-'))
     48       /* no leading dash or after the first number is an error */
     49       return CURLE_RANGE_ERROR;
     50 
     51     if(curlx_str_number(&p, &to, CURL_OFF_T_MAX)) {
     52       /* no second number */
     53       /* X - */
     54       data->state.resume_from = from;
     55       DEBUGF(infof(data, "RANGE %" FMT_OFF_T " to end of file", from));
     56     }
     57     else if(!first_num) {
     58       /* -Y */
     59       if(!to)
     60         /* "-0" is just wrong */
     61         return CURLE_RANGE_ERROR;
     62 
     63       data->req.maxdownload = to;
     64       data->state.resume_from = -to;
     65       DEBUGF(infof(data, "RANGE the last %" FMT_OFF_T " bytes", to));
     66     }
     67     else {
     68       /* X-Y */
     69       curl_off_t totalsize;
     70 
     71       /* Ensure the range is sensible - to should follow from. */
     72       if(from > to)
     73         return CURLE_RANGE_ERROR;
     74 
     75       totalsize = to - from;
     76       if(totalsize == CURL_OFF_T_MAX)
     77         return CURLE_RANGE_ERROR;
     78 
     79       data->req.maxdownload = totalsize + 1; /* include last byte */
     80       data->state.resume_from = from;
     81       DEBUGF(infof(data, "RANGE from %" FMT_OFF_T
     82                    " getting %" FMT_OFF_T " bytes",
     83                    from, data->req.maxdownload));
     84     }
     85     DEBUGF(infof(data, "range-download from %" FMT_OFF_T
     86                  " to %" FMT_OFF_T ", totally %" FMT_OFF_T " bytes",
     87                  from, to, data->req.maxdownload));
     88   }
     89   else
     90     data->req.maxdownload = -1;
     91   return CURLE_OK;
     92 }
     93 
     94 #endif