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