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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#include "curl_range.h"
#include "sendf.h"
#include "strtoofft.h"
/* Only include this function if one or more of FTP, FILE are enabled. */
#if !defined(CURL_DISABLE_FTP) || !defined(CURL_DISABLE_FILE)
/*
Check if this is a range download, and if so, set the internal variables
properly.
*/
CURLcode Curl_range(struct Curl_easy *data)
{
curl_off_t from, to;
char *ptr;
char *ptr2;
if(data->state.use_range && data->state.range) {
CURLofft from_t;
CURLofft to_t;
from_t = curlx_strtoofft(data->state.range, &ptr, 0, &from);
if(from_t == CURL_OFFT_FLOW)
return CURLE_RANGE_ERROR;
while(*ptr && (ISBLANK(*ptr) || (*ptr == '-')))
ptr++;
to_t = curlx_strtoofft(ptr, &ptr2, 0, &to);
if(to_t == CURL_OFFT_FLOW)
return CURLE_RANGE_ERROR;
if((to_t == CURL_OFFT_INVAL) && !from_t) {
/* X - */
data->state.resume_from = from;
DEBUGF(infof(data, "RANGE %" CURL_FORMAT_CURL_OFF_T " to end of file",
from));
}
else if((from_t == CURL_OFFT_INVAL) && !to_t) {
/* -Y */
data->req.maxdownload = to;
data->state.resume_from = -to;
DEBUGF(infof(data, "RANGE the last %" CURL_FORMAT_CURL_OFF_T " bytes",
to));
}
else {
/* X-Y */
curl_off_t totalsize;
/* Ensure the range is sensible - to should follow from. */
if(from > to)
return CURLE_RANGE_ERROR;
totalsize = to - from;
if(totalsize == CURL_OFF_T_MAX)
return CURLE_RANGE_ERROR;
data->req.maxdownload = totalsize + 1; /* include last byte */
data->state.resume_from = from;
DEBUGF(infof(data, "RANGE from %" CURL_FORMAT_CURL_OFF_T
" getting %" CURL_FORMAT_CURL_OFF_T " bytes",
from, data->req.maxdownload));
}
DEBUGF(infof(data, "range-download from %" CURL_FORMAT_CURL_OFF_T
" to %" CURL_FORMAT_CURL_OFF_T ", totally %"
CURL_FORMAT_CURL_OFF_T " bytes",
from, to, data->req.maxdownload));
}
else
data->req.maxdownload = -1;
return CURLE_OK;
}
#endif
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