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126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
// Boost name_generator.hpp header file ----------------------------------------------//
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// Copyright 2010 Andy Tompkins.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_UUID_NAME_GENERATOR_HPP
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#define BOOST_UUID_NAME_GENERATOR_HPP
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#include <boost/uuid/uuid.hpp>
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#include <boost/uuid/sha1.hpp>
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#include <boost/assert.hpp>
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#include <string>
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#include <cstring> // for strlen, wcslen
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#ifdef BOOST_NO_STDC_NAMESPACE
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namespace std {
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using ::strlen;
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using ::wcslen;
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} //namespace std
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#endif //BOOST_NO_STDC_NAMESPACE
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namespace boost {
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namespace uuids {
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// generate a name-based uuid
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// TODO: add in common namesspace uuids
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class name_generator {
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public:
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typedef uuid result_type;
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explicit name_generator(uuid const& namespace_uuid_)
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: namespace_uuid(namespace_uuid_)
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{}
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uuid operator()(const char* name) {
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reset();
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process_characters(name, std::strlen(name));
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return sha_to_uuid();
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}
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uuid operator()(const wchar_t* name) {
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reset();
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process_characters(name, std::wcslen(name));
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return sha_to_uuid();
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}
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template <typename ch, typename char_traits, typename alloc>
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uuid operator()(std::basic_string<ch, char_traits, alloc> const& name) {
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reset();
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process_characters(name.c_str(), name.length());
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return sha_to_uuid();
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}
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uuid operator()(void const* buffer, std::size_t byte_count) {
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reset();
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sha.process_bytes(buffer, byte_count);
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return sha_to_uuid();
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};
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private:
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// we convert all characters to uint32_t so that each
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// character is 4 bytes reguardless of sizeof(char) or
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// sizeof(wchar_t). We want the name string on any
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// platform / compiler to generate the same uuid
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// except for char
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template <typename char_type>
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void process_characters(char_type const*const characters, size_t count) {
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BOOST_ASSERT(sizeof(uint32_t) >= sizeof(char_type));
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for (size_t i=0; i<count; i++) {
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uint32_t c = characters[i];
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sha.process_byte(static_cast<unsigned char>((c >> 0) & 0xFF));
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sha.process_byte(static_cast<unsigned char>((c >> 8) & 0xFF));
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sha.process_byte(static_cast<unsigned char>((c >> 16) & 0xFF));
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sha.process_byte(static_cast<unsigned char>((c >> 24) & 0xFF));
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}
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}
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void process_characters(char const*const characters, size_t count) {
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sha.process_bytes(characters, count);
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}
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void reset()
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{
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sha.reset();
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sha.process_bytes(namespace_uuid.begin(), namespace_uuid.size());
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}
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uuid sha_to_uuid()
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{
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unsigned int digest[5];
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sha.get_digest(digest);
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uuid u;
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for (int i=0; i<4; ++i) {
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*(u.begin() + i*4+0) = static_cast<uint8_t>((digest[i] >> 24) & 0xFF);
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*(u.begin() + i*4+1) = static_cast<uint8_t>((digest[i] >> 16) & 0xFF);
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*(u.begin() + i*4+2) = static_cast<uint8_t>((digest[i] >> 8) & 0xFF);
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*(u.begin() + i*4+3) = static_cast<uint8_t>((digest[i] >> 0) & 0xFF);
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}
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// set variant
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// must be 0b10xxxxxx
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*(u.begin()+8) &= 0xBF;
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*(u.begin()+8) |= 0x80;
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// set version
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// must be 0b0101xxxx
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*(u.begin()+6) &= 0x5F; //0b01011111
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*(u.begin()+6) |= 0x50; //0b01010000
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return u;
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}
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private:
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uuid namespace_uuid;
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detail::sha1 sha;
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};
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}} // namespace boost::uuids
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#endif // BOOST_UUID_NAME_GENERATOR_HPP
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