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168 lines (124 loc) · 4.33 KB
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// curl_easy.cpp
/*===========================================================================
*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
* Author: Vyacheslav Brover
*
* File Description:
* curl_easy functions
*
*/
#undef NDEBUG
#include "curl_easy.hpp"
using namespace Common_sp;
#include "common.inc"
namespace CURL_sp
{
SoftwareVersion getLibVersion ()
{
if (const curl_version_info_data* ver = curl_version_info (CURLVERSION_NOW))
{
const uint major = (ver->version_num >> 16) & 0xff;
const uint minor = (ver->version_num >> 8) & 0xff;
const uint patch = ver->version_num & 0xff;
return SoftwareVersion (major, minor, patch);
}
return SoftwareVersion ();
}
// Curl
namespace
{
size_t write_stream_cb (char* ptr,
size_t size,
size_t nMemb,
void* userData)
{
ASSERT (ptr);
ASSERT (size == 1);
ASSERT (userData);
OFStream& f = * static_cast <OFStream*> (userData);
FOR (size_t, i, nMemb)
f << ptr [i];
return nMemb;
}
size_t write_string_cb (char* ptr,
size_t size,
size_t nMemb,
void* userData)
{
ASSERT (ptr);
ASSERT (size == 1);
ASSERT (userData);
string& s = * static_cast <string*> (userData);
FOR (size_t, i, nMemb)
s += ptr [i];
return nMemb;
}
}
void Curl::download (const string &url,
const string &fName)
{
ASSERT (! fName. empty ());
{
OFStream f (fName);
curl_easy_setopt (eh, CURLOPT_WRITEFUNCTION, write_stream_cb);
curl_easy_setopt (eh, CURLOPT_WRITEDATA, & f);
process (url, "download");
}
IFStream f (fName);
string s;
f >> s;
if (s == "<?xml")
throw runtime_error ("Cannot download " + strQuote (fName));
}
string Curl::read (const string &url)
{
string s; s. reserve (1024); // PAR
curl_easy_setopt (eh, CURLOPT_WRITEFUNCTION, write_string_cb);
curl_easy_setopt (eh, CURLOPT_WRITEDATA, & s);
process (url, "read");
return s;
}
void Curl::process (const string &url,
const string &error_msg_action)
{
QC_ASSERT (! url. empty ());
char err [CURL_ERROR_SIZE + 1] = "";
curl_easy_setopt (eh, CURLOPT_ERRORBUFFER, err);
curl_easy_setopt (eh, CURLOPT_URL, url. c_str ());
if (isLeft (url, "ftp://"))
curl_easy_setopt (eh, CURLOPT_FTP_USE_EPSV, 0);
const CURLcode cc = curl_easy_perform (eh);
if (cc)
{
const SoftwareVersion ver (CURL_sp::getLibVersion ());
throw runtime_error ("CURL: Cannot " + error_msg_action
+ "\n from " + url
+ "\n code=" + to_string ((int) cc)
+ "\n error: " + err
+ "\n version: " + ver. str ()
);
}
}
} // namespace