premiere-libtorrent/src/string_util.cpp

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/*
Copyright (c) 2012-2016, 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/config.hpp"
#include "libtorrent/string_util.hpp"
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#include "libtorrent/random.hpp"
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#include "libtorrent/error_code.hpp"
#include "libtorrent/parse_url.hpp"
#include "libtorrent/address.hpp"
#include "libtorrent/assert.hpp"
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#include <cstdlib> // for malloc
#include <cstring> // for memmov/strcpy/strlen
namespace libtorrent
{
// lexical_cast's result depends on the locale. We need
// a well defined result
std::array<char, 4 + std::numeric_limits<std::int64_t>::digits10>
to_string(std::int64_t n)
{
std::array<char, 4 + std::numeric_limits<std::int64_t>::digits10> ret;
char *p = &ret.back();
*p = '\0';
std::uint64_t un = n;
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4146 ) /* warning C4146: unary minus operator applied to unsigned type */
#endif // _MSC_VER
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if (n < 0) un = -un;
#ifdef _MSC_VER
#pragma warning(pop)
#endif // _MSC_VER
do {
*--p = '0' + un % 10;
un /= 10;
} while (un);
if (n < 0) *--p = '-';
std::memmove(&ret[0], p, &ret.back() - p + 1);
return ret;
}
bool is_alpha(char c)
{
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
bool is_print(char c)
{
return c >= 32 && c < 127;
}
bool is_space(char c)
{
static const char* ws = " \t\n\r\f\v";
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return strchr(ws, c) != nullptr;
}
char to_lower(char c)
{
return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c;
}
int split_string(char const** tags, int buf_size, char* in)
{
int ret = 0;
char* i = in;
for (;*i; ++i)
{
if (!is_print(*i) || is_space(*i))
{
*i = 0;
if (ret == buf_size) return ret;
continue;
}
if (i == in || i[-1] == 0)
{
tags[ret++] = i;
}
}
return ret;
}
bool string_begins_no_case(char const* s1, char const* s2)
{
TORRENT_ASSERT(s1 != nullptr);
TORRENT_ASSERT(s2 != nullptr);
while (*s1 != 0)
{
if (to_lower(*s1) != to_lower(*s2)) return false;
++s1;
++s2;
}
return true;
}
bool string_equal_no_case(char const* s1, char const* s2)
{
TORRENT_ASSERT(s1 != nullptr);
TORRENT_ASSERT(s2 != nullptr);
while (to_lower(*s1) == to_lower(*s2))
{
if (*s1 == 0) return true;
++s1;
++s2;
}
return false;
}
// generate a url-safe random string
void url_random(char* begin, char* end)
{
// http-accepted characters:
// excluding ', since some buggy trackers don't support that
static char const printable[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz-_.!~*()";
// the random number
while (begin != end)
*begin++ = printable[random(sizeof(printable) - 2)];
}
bool string_ends_with(string_view s1, string_view s2)
{
return s1.size() >= s2.size() && std::equal(s2.rbegin(), s2.rend(), s1.rbegin());
}
char* allocate_string_copy(char const* str)
{
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if (str == nullptr) return nullptr;
int const len = int(std::strlen(str));
char* tmp = static_cast<char*>(std::malloc(len + 1));
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if (tmp == nullptr) return nullptr;
std::memcpy(tmp, str, len);
tmp[len] = '\0';
return tmp;
}
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// 8-byte align pointer
void* align_pointer(void* p)
{
int offset = uintptr_t(p) & 0x7;
// if we're already aligned, don't do anything
if (offset == 0) return p;
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// offset is how far passed the last aligned address
// we are. We need to go forward to the next aligned
// one. Since aligned addresses are 8 bytes apart, add
// 8 - offset.
return static_cast<char*>(p) + (8 - offset);
}
std::string print_listen_interfaces(std::vector<listen_interface_t> const& in)
{
std::string ret;
for (std::vector<listen_interface_t>::const_iterator i = in.begin()
, end(in.end()); i != end; ++i)
{
if (i != in.begin()) ret += ",";
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#if TORRENT_USE_IPV6
error_code ec;
address_v6::from_string(i->device, ec);
if (!ec)
{
// IPv6 addresses must be wrapped in square brackets
ret += "[";
ret += i->device;
ret += "]";
}
else
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#endif
{
ret += i->device;
}
ret += ":";
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ret += to_string(i->port).data();
if (i->ssl) ret += "s";
}
return ret;
}
// this parses the string that's used as the listen_interfaces setting.
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// it is a comma-separated list of IP or device names with ports. For
// example: "eth0:6881,eth1:6881" or "127.0.0.1:6881"
std::vector<listen_interface_t> parse_listen_interfaces(std::string const& in)
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{
std::vector<listen_interface_t> out;
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std::string::size_type start = 0;
while (start < in.size())
{
// skip leading spaces
while (start < in.size() && is_space(in[start]))
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++start;
if (start == in.size()) return out;
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listen_interface_t iface;
iface.ssl = false;
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#if !TORRENT_USE_IPV6
bool ipv6 = false;
#endif
if (in[start] == '[')
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{
#if !TORRENT_USE_IPV6
ipv6 = true;
#endif
++start;
// IPv6 address
while (start < in.size() && in[start] != ']')
iface.device += in[start++];
// skip to the colon
while (start < in.size() && in[start] != ':')
++start;
}
else
{
// consume device name
while (start < in.size() && !is_space(in[start]) && in[start] != ':')
iface.device += in[start++];
}
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// skip spaces
while (start < in.size() && is_space(in[start]))
++start;
if (start == in.size() || in[start] != ':') return out;
++start; // skip colon
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// skip spaces
while (start < in.size() && is_space(in[start]))
++start;
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// consume port
std::string port;
while (start < in.size() && is_digit(in[start]) && in[start] != ',')
port += in[start++];
if (port.empty() || port.size() > 5)
{
iface.port = -1;
}
else
{
iface.port = std::atoi(port.c_str());
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if (iface.port < 0 || iface.port > 65535) iface.port = -1;
}
// skip spaces
while (start < in.size() && is_space(in[start]))
++start;
// consume potential SSL 's'
if (start < in.size() && in[start] == 's')
{
iface.ssl = true;
++start;
}
// skip until end or comma
while (start < in.size() && in[start] != ',')
++start;
if (iface.port >= 0
#if !TORRENT_USE_IPV6
&& ipv6 == false
#endif
)
{
out.push_back(iface);
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}
// skip the comma
if (start < in.size() && in[start] == ',')
++start;
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}
return out;
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}
// this parses the string that's used as the listen_interfaces setting.
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// it is a comma-separated list of IP or device names with ports. For
// example: "eth0:6881,eth1:6881" or "127.0.0.1:6881"
void parse_comma_separated_string_port(std::string const& in
, std::vector<std::pair<std::string, int>>& out)
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{
out.clear();
std::string::size_type start = 0;
std::string::size_type end = 0;
while (start < in.size())
{
// skip leading spaces
while (start < in.size()
&& is_space(in[start]))
++start;
end = in.find_first_of(',', start);
if (end == std::string::npos) end = in.size();
std::string::size_type colon = in.find_last_of(':', end);
if (colon != std::string::npos && colon > start)
{
int port = atoi(in.substr(colon + 1, end - colon - 1).c_str());
// skip trailing spaces
std::string::size_type soft_end = colon;
while (soft_end > start
&& is_space(in[soft_end-1]))
--soft_end;
// in case this is an IPv6 address, strip off the square brackets
// to make it more easily parseable into an ip::address
if (in[start] == '[') ++start;
if (soft_end > start && in[soft_end-1] == ']') --soft_end;
out.push_back(std::make_pair(in.substr(start, soft_end - start), port));
}
start = end + 1;
}
}
void parse_comma_separated_string(std::string const& in, std::vector<std::string>& out)
{
out.clear();
std::string::size_type start = 0;
std::string::size_type end = 0;
while (start < in.size())
{
// skip leading spaces
while (start < in.size()
&& is_space(in[start]))
++start;
end = in.find_first_of(',', start);
if (end == std::string::npos) end = in.size();
// skip trailing spaces
std::string::size_type soft_end = end;
while (soft_end > start
&& is_space(in[soft_end-1]))
--soft_end;
out.push_back(in.substr(start, soft_end - start));
start = end + 1;
}
}
char* string_tokenize(char* last, char sep, char** next)
{
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if (last == nullptr) return nullptr;
if (last[0] == '"')
{
*next = strchr(last + 1, '"');
// consume the actual separator as well.
if (*next != nullptr)
*next = strchr(*next, sep);
}
else
{
*next = strchr(last, sep);
}
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if (*next == nullptr) return last;
**next = 0;
++(*next);
while (**next == sep && **next) ++(*next);
return last;
}
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#if TORRENT_USE_I2P
bool is_i2p_url(std::string const& url)
{
using std::ignore;
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std::string hostname;
error_code ec;
std::tie(ignore, ignore, hostname, ignore, ignore)
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= parse_url_components(url, ec);
return string_ends_with(hostname, ".i2p");
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}
#endif
}