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added magnet-uri functions and a base32 decode function

This commit is contained in:
Arvid Norberg 2007-12-03 06:03:16 +00:00
parent a7b5250058
commit 20621cae02
7 changed files with 244 additions and 12 deletions
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1
Jamfile
View File

@ -243,6 +243,7 @@ SOURCES =
disk_io_thread
enum_net
broadcast_socket
magnet_uri
;
KADEMLIA_SOURCES =

2
examples/client_test.cpp
View File

@ -62,6 +62,7 @@ POSSIBILITY OF SUCH DAMAGE.
#include "libtorrent/identify_client.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/ip_filter.hpp"
#include "libtorrent/magnet_uri.hpp"
using boost::bind;
@ -1049,6 +1050,7 @@ int main(int ac, char* av[])
out << "peers: " << s.num_peers << " "
<< "seeds: " << s.num_seeds << " "
<< "distributed copies: " << s.distributed_copies << "\n"
<< " magnet-link: " << make_magnet_uri(h) << "\n"
<< " download: " << esc("32") << (s.download_rate > 0 ? add_suffix(s.download_rate) + "/s ": " ") << esc("0")
<< "(" << esc("32") << add_suffix(s.total_download) << esc("0") << ") ";
}

1
include/libtorrent/escape_string.hpp
View File

@ -47,6 +47,7 @@ namespace libtorrent
TORRENT_EXPORT std::string base64encode(std::string const& s);
// encodes a string using the base32 scheme
TORRENT_EXPORT std::string base32encode(std::string const& s);
TORRENT_EXPORT std::string base32decode(std::string const& s);
TORRENT_EXPORT boost::optional<std::string> url_has_argument(
std::string const& url, std::string argument);

59
include/libtorrent/magnet_uri.hpp Normal file
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@ -0,0 +1,59 @@
/*
Copyright (c) 2007, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TORRENT_MAGNET_URI_HPP_INCLUDED
#define TORRENT_MAGNET_URI_HPP_INCLUDED
#include <string>
#include "libtorrent/config.hpp"
#include "libtorrent/torrent_handle.hpp"
#include "libtorrent/session.hpp"
#include <boost/filesystem/path.hpp>
namespace libtorrent
{
namespace fs = boost::filesystem;
struct torrent_handle;
std::string TORRENT_EXPORT make_magnet_uri(torrent_handle const& handle);
torrent_handle TORRENT_EXPORT add_magnet_uri(session& ses, std::string const& uri
, fs::path const& save_path
, storage_mode_t storage_mode = storage_mode_sparse
, bool paused = false
, storage_constructor_type sc = default_storage_constructor
, void* userdata = 0);
}
#endif

75
src/escape_string.cpp
View File

@ -38,6 +38,7 @@ POSSIBILITY OF SUCH DAMAGE.
#include <iomanip>
#include <cctype>
#include <algorithm>
#include <iostream>
#include <boost/optional.hpp>
@ -178,11 +179,8 @@ namespace libtorrent
std::fill(inbuf, inbuf+3, 0);
// read a chunk of input into inbuf
for (int j = 0; j < available_input; ++j)
{
inbuf[j] = *i;
++i;
}
std::copy(i, i + available_input, inbuf);
i += available_input;
// encode inbuf to outbuf
outbuf[0] = (inbuf[0] & 0xfc) >> 2;
@ -223,19 +221,14 @@ namespace libtorrent
std::string ret;
for (std::string::const_iterator i = s.begin(); i != s.end();)
{
// available input is 1,2 or 3 bytes
// since we read 3 bytes at a time at most
int available_input = (std::min)(5, (int)std::distance(i, s.end()));
// clear input buffer
std::fill(inbuf, inbuf+5, 0);
// read a chunk of input into inbuf
for (int j = 0; j < available_input; ++j)
{
inbuf[j] = *i;
++i;
}
std::copy(i, i + available_input, inbuf);
i += available_input;
// encode inbuf to outbuf
outbuf[0] = (inbuf[0] & 0xf8) >> 3;
@ -263,6 +256,64 @@ namespace libtorrent
return ret;
}
std::string base32decode(std::string const& s)
{
unsigned char inbuf[8];
unsigned char outbuf[5];
std::string ret;
for (std::string::const_iterator i = s.begin(); i != s.end();)
{
int available_input = (std::min)(8, (int)std::distance(i, s.end()));
int pad_start = 0;
if (available_input < 8) pad_start = available_input;
// clear input buffer
std::fill(inbuf, inbuf+8, 0);
for (int j = 0; j < available_input; ++j)
{
char in = std::toupper(*i++);
if (in >= 'A' && in <= 'Z')
inbuf[j] = in - 'A';
else if (in >= '2' && in <= '7')
inbuf[j] = in - '2' + ('Z' - 'A') + 1;
else if (in == '=')
{
inbuf[j] = 0;
if (pad_start == 0) pad_start = j;
}
else if (in == '1')
inbuf[j] = 'I' - 'A';
else
return std::string();
TORRENT_ASSERT(inbuf[j] == (inbuf[j] & 0x1f));
}
// decode inbuf to outbuf
outbuf[0] = inbuf[0] << 3;
outbuf[0] |= inbuf[1] >> 2;
outbuf[1] = (inbuf[1] & 0x3) << 6;
outbuf[1] |= inbuf[2] << 1;
outbuf[1] |= (inbuf[3] & 0x10) >> 4;
outbuf[2] = (inbuf[3] & 0x0f) << 4;
outbuf[2] |= (inbuf[4] & 0x1e) >> 1;
outbuf[3] = (inbuf[4] & 0x01) << 7;
outbuf[3] |= (inbuf[5] & 0x1f) << 2;
outbuf[3] |= (inbuf[6] & 0x18) >> 3;
outbuf[4] = (inbuf[6] & 0x07) << 5;
outbuf[4] |= inbuf[7];
int input_output_mapping[] = {5, 1, 1, 2, 2, 3, 4, 4, 5};
int num_out = input_output_mapping[pad_start];
// write output
std::copy(outbuf, outbuf + num_out, std::back_inserter(ret));
}
std::cerr << " base32decode(): " << ret << std::endl;
return ret;
}
boost::optional<std::string> url_has_argument(
std::string const& url, std::string argument)
{

99
src/magnet_uri.cpp Normal file
View File

@ -0,0 +1,99 @@
/*
Copyright (c) 2007, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/magnet_uri.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/torrent_handle.hpp"
#include "libtorrent/escape_string.hpp"
#include <string>
#include <sstream>
namespace libtorrent
{
std::string make_magnet_uri(torrent_handle const& handle)
{
std::stringstream ret;
if (!handle.is_valid()) return ret.str();
std::string name = handle.name();
ret << "magnet:?xt=urn:btih:" << base32encode((char*)handle.info_hash().begin());
if (!name.empty())
ret << "&dn=" << escape_string(name.c_str(), name.length());
torrent_status st = handle.status();
if (!st.current_tracker.empty())
{
ret << "&tr=" << escape_string(st.current_tracker.c_str()
, st.current_tracker.length());
}
else
{
std::vector<announce_entry> const& tr = handle.trackers();
if (!tr.empty())
{
ret << "&tr=" << escape_string(tr[0].url.c_str()
, tr[0].url.length());
}
}
return ret.str();
}
torrent_handle add_magnet_uri(session& ses, std::string const& uri
, fs::path const& save_path
, storage_mode_t storage_mode
, bool paused
, storage_constructor_type sc
, void* userdata)
{
std::string name;
std::string tracker;
boost::optional<std::string> display_name = url_has_argument(uri, "dn");
if (display_name) name = unescape_string(display_name->c_str());
boost::optional<std::string> tracker_string = url_has_argument(uri, "tr");
if (tracker_string) tracker = unescape_string(tracker_string->c_str());
boost::optional<std::string> btih = url_has_argument(uri, "xt");
if (!btih) return torrent_handle();
if (btih->compare(0, 9, "urn:btih:") != 0) return torrent_handle();
sha1_hash info_hash(base32decode(btih->substr(9)));
return ses.add_torrent(tracker.empty() ? 0 : tracker.c_str(), info_hash
, name.empty() ? 0 : name.c_str(), save_path, entry()
, storage_mode, paused, sc, userdata);
}
}

19
test/test_primitives.cpp
View File

@ -101,6 +101,25 @@ int test_main()
TEST_CHECK(base32encode("fooba") == "MZXW6YTB");
TEST_CHECK(base32encode("foobar") == "MZXW6YTBOI======");
TEST_CHECK(base32decode("") == "");
TEST_CHECK(base32decode("MY======") == "f");
TEST_CHECK(base32decode("MZXQ====") == "fo");
TEST_CHECK(base32decode("MZXW6===") == "foo");
TEST_CHECK(base32decode("MZXW6YQ=") == "foob");
TEST_CHECK(base32decode("MZXW6YTB") == "fooba");
TEST_CHECK(base32decode("MZXW6YTBOI======") == "foobar");
TEST_CHECK(base32decode("MY") == "f");
TEST_CHECK(base32decode("MZXW6YQ") == "foob");
TEST_CHECK(base32decode("MZXW6YTBOI") == "foobar");
TEST_CHECK(base32decode("mZXw6yTBO1======") == "foobar");
std::string test;
for (int i = 0; i < 255; ++i)
test += char(i);
TEST_CHECK(base32decode(base32encode(test)) == test);
// url_has_argument
TEST_CHECK(!url_has_argument("http://127.0.0.1/test", "test"));