1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2021, 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 ***************************************************************************/
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 */
Curl_range(struct Curl_easy * data)36 CURLcode Curl_range(struct Curl_easy *data)
37 {
38 curl_off_t from, to;
39 char *ptr;
40 char *ptr2;
41
42 if(data->state.use_range && data->state.range) {
43 CURLofft from_t;
44 CURLofft to_t;
45 from_t = curlx_strtoofft(data->state.range, &ptr, 0, &from);
46 if(from_t == CURL_OFFT_FLOW)
47 return CURLE_RANGE_ERROR;
48 while(*ptr && (ISSPACE(*ptr) || (*ptr == '-')))
49 ptr++;
50 to_t = curlx_strtoofft(ptr, &ptr2, 0, &to);
51 if(to_t == CURL_OFFT_FLOW)
52 return CURLE_RANGE_ERROR;
53 if((to_t == CURL_OFFT_INVAL) && !from_t) {
54 /* X - */
55 data->state.resume_from = from;
56 DEBUGF(infof(data, "RANGE %" CURL_FORMAT_CURL_OFF_T " to end of file",
57 from));
58 }
59 else if((from_t == CURL_OFFT_INVAL) && !to_t) {
60 /* -Y */
61 data->req.maxdownload = to;
62 data->state.resume_from = -to;
63 DEBUGF(infof(data, "RANGE the last %" CURL_FORMAT_CURL_OFF_T " bytes",
64 to));
65 }
66 else {
67 /* X-Y */
68 curl_off_t totalsize;
69
70 /* Ensure the range is sensible - to should follow from. */
71 if(from > to)
72 return CURLE_RANGE_ERROR;
73
74 totalsize = to - from;
75 if(totalsize == CURL_OFF_T_MAX)
76 return CURLE_RANGE_ERROR;
77
78 data->req.maxdownload = totalsize + 1; /* include last byte */
79 data->state.resume_from = from;
80 DEBUGF(infof(data, "RANGE from %" CURL_FORMAT_CURL_OFF_T
81 " getting %" CURL_FORMAT_CURL_OFF_T " bytes",
82 from, data->req.maxdownload));
83 }
84 DEBUGF(infof(data, "range-download from %" CURL_FORMAT_CURL_OFF_T
85 " to %" CURL_FORMAT_CURL_OFF_T ", totally %"
86 CURL_FORMAT_CURL_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
95