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Annotation of embedaddon/curl/lib/curl_range.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      8:  * Copyright (C) 1998 - 2018, 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: 
                     23: #include "curl_setup.h"
                     24: #include <curl/curl.h>
                     25: #include "curl_range.h"
                     26: #include "sendf.h"
                     27: #include "strtoofft.h"
                     28: 
                     29: /* Only include this function if one or more of FTP, FILE are enabled. */
                     30: #if !defined(CURL_DISABLE_FTP) || !defined(CURL_DISABLE_FILE)
                     31: 
                     32:  /*
                     33:   Check if this is a range download, and if so, set the internal variables
                     34:   properly.
                     35:  */
                     36: CURLcode Curl_range(struct connectdata *conn)
                     37: {
                     38:   curl_off_t from, to;
                     39:   char *ptr;
                     40:   char *ptr2;
                     41:   struct Curl_easy *data = conn->data;
                     42: 
                     43:   if(data->state.use_range && data->state.range) {
                     44:     CURLofft from_t;
                     45:     CURLofft to_t;
                     46:     from_t = curlx_strtoofft(data->state.range, &ptr, 0, &from);
                     47:     if(from_t == CURL_OFFT_FLOW)
                     48:       return CURLE_RANGE_ERROR;
                     49:     while(*ptr && (ISSPACE(*ptr) || (*ptr == '-')))
                     50:       ptr++;
                     51:     to_t = curlx_strtoofft(ptr, &ptr2, 0, &to);
                     52:     if(to_t == CURL_OFFT_FLOW)
                     53:       return CURLE_RANGE_ERROR;
                     54:     if((to_t == CURL_OFFT_INVAL) && !from_t) {
                     55:       /* X - */
                     56:       data->state.resume_from = from;
                     57:       DEBUGF(infof(data, "RANGE %" CURL_FORMAT_CURL_OFF_T " to end of file\n",
                     58:                    from));
                     59:     }
                     60:     else if((from_t == CURL_OFFT_INVAL) && !to_t) {
                     61:       /* -Y */
                     62:       data->req.maxdownload = to;
                     63:       data->state.resume_from = -to;
                     64:       DEBUGF(infof(data, "RANGE the last %" CURL_FORMAT_CURL_OFF_T " bytes\n",
                     65:                    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 %" CURL_FORMAT_CURL_OFF_T
                     82:                    " getting %" CURL_FORMAT_CURL_OFF_T " bytes\n",
                     83:                    from, data->req.maxdownload));
                     84:     }
                     85:     DEBUGF(infof(data, "range-download from %" CURL_FORMAT_CURL_OFF_T
                     86:                  " to %" CURL_FORMAT_CURL_OFF_T ", totally %"
                     87:                  CURL_FORMAT_CURL_OFF_T " bytes\n",
                     88:                  from, to, data->req.maxdownload));
                     89:   }
                     90:   else
                     91:     data->req.maxdownload = -1;
                     92:   return CURLE_OK;
                     93: }
                     94: 
                     95: #endif