102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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Copyright (c) 2003-2016, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libtorrent/hex.hpp"
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namespace libtorrent
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{
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namespace detail {
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TORRENT_EXTRA_EXPORT int hex_to_int(char in)
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{
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if (in >= '0' && in <= '9') return int(in) - '0';
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if (in >= 'A' && in <= 'F') return int(in) - 'A' + 10;
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if (in >= 'a' && in <= 'f') return int(in) - 'a' + 10;
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return -1;
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}
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TORRENT_EXTRA_EXPORT bool is_hex(char const *in, int len)
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{
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for (char const* end = in + len; in < end; ++in)
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{
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int t = hex_to_int(*in);
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if (t == -1) return false;
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}
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return true;
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}
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} // detail namespace
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TORRENT_EXPORT bool from_hex(char const *in, int len, char* out)
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{
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for (char const* end = in + len; in < end; ++in, ++out)
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{
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int t = detail::hex_to_int(*in);
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if (t == -1) return false;
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*out = t << 4;
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++in;
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t = detail::hex_to_int(*in);
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if (t == -1) return false;
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*out |= t & 15;
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}
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return true;
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}
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extern const char hex_chars[];
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const char hex_chars[] = "0123456789abcdef";
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TORRENT_EXPORT std::string to_hex(std::string const& s)
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{
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std::string ret;
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for (std::string::const_iterator i = s.begin(); i != s.end(); ++i)
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{
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ret += hex_chars[boost::uint8_t(*i) >> 4];
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ret += hex_chars[boost::uint8_t(*i) & 0xf];
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}
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return ret;
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}
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TORRENT_EXPORT void to_hex(char const *in, int len, char* out)
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{
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for (char const* end = in + len; in < end; ++in)
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{
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*out++ = hex_chars[boost::uint8_t(*in) >> 4];
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*out++ = hex_chars[boost::uint8_t(*in) & 0xf];
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}
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*out = '\0';
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}
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}
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