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 "strtoofft.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 */ 38CURLcode Curl_range(struct Curl_easy *data) 39{ 40 curl_off_t from, to; 41 char *ptr; 42 char *ptr2; 43 44 if(data->state.use_range && data->state.range) { 45 CURLofft from_t; 46 CURLofft to_t; 47 from_t = curlx_strtoofft(data->state.range, &ptr, 10, &from); 48 if(from_t == CURL_OFFT_FLOW) 49 return CURLE_RANGE_ERROR; 50 while(*ptr && (ISBLANK(*ptr) || (*ptr == '-'))) 51 ptr++; 52 to_t = curlx_strtoofft(ptr, &ptr2, 10, &to); 53 if(to_t == CURL_OFFT_FLOW) 54 return CURLE_RANGE_ERROR; 55 if((to_t == CURL_OFFT_INVAL) && !from_t) { 56 /* X - */ 57 data->state.resume_from = from; 58 DEBUGF(infof(data, "RANGE %" CURL_FORMAT_CURL_OFF_T " to end of file", 59 from)); 60 } 61 else if((from_t == CURL_OFFT_INVAL) && !to_t) { 62 /* -Y */ 63 data->req.maxdownload = to; 64 data->state.resume_from = -to; 65 DEBUGF(infof(data, "RANGE the last %" CURL_FORMAT_CURL_OFF_T " bytes", 66 to)); 67 } 68 else { 69 /* X-Y */ 70 curl_off_t totalsize; 71 72 /* Ensure the range is sensible - to should follow from. */ 73 if(from > to) 74 return CURLE_RANGE_ERROR; 75 76 totalsize = to - from; 77 if(totalsize == CURL_OFF_T_MAX) 78 return CURLE_RANGE_ERROR; 79 80 data->req.maxdownload = totalsize + 1; /* include last byte */ 81 data->state.resume_from = from; 82 DEBUGF(infof(data, "RANGE from %" CURL_FORMAT_CURL_OFF_T 83 " getting %" CURL_FORMAT_CURL_OFF_T " bytes", 84 from, data->req.maxdownload)); 85 } 86 DEBUGF(infof(data, "range-download from %" CURL_FORMAT_CURL_OFF_T 87 " to %" CURL_FORMAT_CURL_OFF_T ", totally %" 88 CURL_FORMAT_CURL_OFF_T " bytes", 89 from, to, data->req.maxdownload)); 90 } 91 else 92 data->req.maxdownload = -1; 93 return CURLE_OK; 94} 95 96#endif 97