| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2018, Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 | #include <curl/curl.h>
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| 25 | #include "curl_range.h"
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| 26 | #include "sendf.h"
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| 27 | #include "strtoofft.h"
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| 28 |
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| 29 | /* Only include this function if one or more of FTP, FILE are enabled. */
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| 30 | #if !defined(CURL_DISABLE_FTP) || !defined(CURL_DISABLE_FILE)
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| 31 |
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| 32 | /*
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| 33 | Check if this is a range download, and if so, set the internal variables
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| 34 | properly.
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| 35 | */
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| 36 | CURLcode Curl_range(struct connectdata *conn)
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| 37 | {
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| 38 | curl_off_t from, to;
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| 39 | char *ptr;
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| 40 | char *ptr2;
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| 41 | struct Curl_easy *data = conn->data;
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| 42 |
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| 43 | if(data->state.use_range && data->state.range) {
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| 44 | CURLofft from_t;
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| 45 | CURLofft to_t;
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| 46 | from_t = curlx_strtoofft(data->state.range, &ptr, 0, &from);
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| 47 | if(from_t == CURL_OFFT_FLOW)
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| 48 | return CURLE_RANGE_ERROR;
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| 49 | while(*ptr && (ISSPACE(*ptr) || (*ptr == '-')))
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| 50 | ptr++;
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| 51 | to_t = curlx_strtoofft(ptr, &ptr2, 0, &to);
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| 52 | if(to_t == CURL_OFFT_FLOW)
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| 53 | return CURLE_RANGE_ERROR;
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| 54 | if((to_t == CURL_OFFT_INVAL) && !from_t) {
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| 55 | /* X - */
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| 56 | data->state.resume_from = from;
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| 57 | DEBUGF(infof(data, "RANGE %" CURL_FORMAT_CURL_OFF_T " to end of file\n",
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| 58 | from));
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| 59 | }
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| 60 | else if((from_t == CURL_OFFT_INVAL) && !to_t) {
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| 61 | /* -Y */
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| 62 | data->req.maxdownload = to;
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| 63 | data->state.resume_from = -to;
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| 64 | DEBUGF(infof(data, "RANGE the last %" CURL_FORMAT_CURL_OFF_T " bytes\n",
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| 65 | to));
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| 66 | }
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| 67 | else {
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| 68 | /* X-Y */
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| 69 | curl_off_t totalsize;
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| 70 |
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| 71 | /* Ensure the range is sensible - to should follow from. */
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| 72 | if(from > to)
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| 73 | return CURLE_RANGE_ERROR;
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| 74 |
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| 75 | totalsize = to - from;
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| 76 | if(totalsize == CURL_OFF_T_MAX)
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| 77 | return CURLE_RANGE_ERROR;
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| 78 |
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| 79 | data->req.maxdownload = totalsize + 1; /* include last byte */
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| 80 | data->state.resume_from = from;
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| 81 | DEBUGF(infof(data, "RANGE from %" CURL_FORMAT_CURL_OFF_T
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| 82 | " getting %" CURL_FORMAT_CURL_OFF_T " bytes\n",
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| 83 | from, data->req.maxdownload));
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| 84 | }
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| 85 | DEBUGF(infof(data, "range-download from %" CURL_FORMAT_CURL_OFF_T
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| 86 | " to %" CURL_FORMAT_CURL_OFF_T ", totally %"
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| 87 | CURL_FORMAT_CURL_OFF_T " bytes\n",
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| 88 | from, to, data->req.maxdownload));
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| 89 | }
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| 90 | else
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| 91 | data->req.maxdownload = -1;
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| 92 | return CURLE_OK;
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| 93 | }
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| 94 |
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| 95 | #endif
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