libcruft-util/guid.cpp
2016-08-15 20:56:10 +10:00

220 lines
5.8 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2011 Danny Robson <danny@nerdcruft.net>
*/
#include "guid.hpp"
#include "debug.hpp"
#include "endian.hpp"
#include "types.hpp"
#include <algorithm>
#include <iomanip>
#include <sstream>
using util::guid;
///////////////////////////////////////////////////////////////////////////////
guid::guid (uint32_t _data1,
uint16_t _data2,
uint16_t _data3,
uint8_t _data4[8]):
data1 (_data1),
data2 (_data2),
data3 (_data3)
{
std::copy (_data4, _data4 + elems (data4), data4);
}
//-----------------------------------------------------------------------------
guid::guid (void)
{
;
}
//-----------------------------------------------------------------------------
guid::guid (const char *str) {
std::istringstream is (str);
is >> *this;
}
//-----------------------------------------------------------------------------
guid::guid (const guid &rhs) {
*this = rhs;
}
//-----------------------------------------------------------------------------
guid&
guid::operator= (const guid &rhs) {
data1 = rhs.data1;
data2 = rhs.data2;
data3 = rhs.data3;
std::copy (rhs.data4 + 0, rhs.data4 + elems (rhs.data4), data4 + 0);
return *this;
}
///////////////////////////////////////////////////////////////////////////////
guid
guid::from_bytes (const uint8_t *bytes) {
guid g;
g.data1 = *reinterpret_cast<const uint32_t *> (bytes);
bytes += sizeof (g.data1);
g.data2 = *reinterpret_cast<const uint16_t *> (bytes);
bytes += sizeof (g.data2);
g.data3 = *reinterpret_cast<const uint16_t *> (bytes);
bytes += sizeof (g.data3);
for (signed i = 7; i >= 0; --i)
g.data4[i] = *bytes++;
return g;
}
//-----------------------------------------------------------------------------
guid
guid::from_string (const char *bytes)
{ return guid (bytes); }
///////////////////////////////////////////////////////////////////////////////
guid::type
guid::get_type (void) const {
// Top three bits signal the type
unsigned bits = data4[2] >> 5U;
switch (bits) {
case 0x0:
case 0x1:
case 0x2:
case 0x3: return NCS_BACKWARD;
case 0x4:
case 0x5: return STANDARD;
case 0x6: return COM_BACKWARD;
case 0x7: return RESERVED;
}
unreachable ();
}
//-----------------------------------------------------------------------------
bool
guid::operator< (const guid &rhs) const {
if (data1 != rhs.data1)
return data1 < rhs.data1;
if (data2 != rhs.data2)
return data2 < rhs.data2;
if (data3 != rhs.data3)
return data3 < rhs.data3;
for (unsigned i = 0; i < elems (data4); ++i) {
if (data4[i] == rhs.data4[i])
return data4[i] < rhs.data4[i];
}
// All equal, so not less than
return false;
}
//-----------------------------------------------------------------------------
bool
guid::operator== (const guid &rhs) const {
return data1 == rhs.data1 &&
data2 == rhs.data2 &&
data3 == rhs.data3 &&
data4[0] == rhs.data4[0] &&
data4[1] == rhs.data4[1] &&
data4[2] == rhs.data4[2] &&
data4[3] == rhs.data4[3] &&
data4[4] == rhs.data4[4] &&
data4[5] == rhs.data4[5] &&
data4[6] == rhs.data4[6] &&
data4[7] == rhs.data4[7];
}
///////////////////////////////////////////////////////////////////////////////
std::ostream&
operator<< (std::ostream &os, const guid &g) {
uint64_t data4_b = static_cast<uint64_t> (g.data4[0]) << 0u |
static_cast<uint64_t> (g.data4[1]) << 8u |
static_cast<uint64_t> (g.data4[2]) << 16u |
static_cast<uint64_t> (g.data4[3]) << 24u |
static_cast<uint64_t> (g.data4[4]) << 32u |
static_cast<uint64_t> (g.data4[5]) << 40u;
uint16_t data4_a = static_cast<uint16_t> (g.data4[6]) << 0u |
static_cast<uint16_t> (g.data4[7]) << 8u;
os << std::hex << std::setfill ('0')
<< std::setw (2 * sizeof (g.data1)) << g.data1 << "-"
<< std::setw (2 * sizeof (g.data2)) << g.data2 << "-"
<< std::setw (2 * sizeof (g.data3)) << g.data3 << "-"
<< std::setw (2 * 2) << data4_a << "-"
<< std::setw (2 * 6) << data4_b;
os << std::dec;
return os;
}
//-----------------------------------------------------------------------------
std::istream&
operator>> (std::istream &is, guid &g) {
bool braces = '{' == is.peek ();
if (braces)
is.get ();
uint8_t dash1, dash2, dash3, dash4a;
uint16_t data4_a;
uint64_t data4_b;
is >> std::hex
>> g.data1 >> dash1
>> g.data2 >> dash2
>> g.data3 >> dash3
>> data4_a >> dash4a
>> data4_b;
uint64_t data4 = data4_b | static_cast<uint64_t> (data4_a) << 48u;
g.data4[0] = data4 & 0xFF; data4 >>= 8u;
g.data4[1] = data4 & 0xFF; data4 >>= 8u;
g.data4[2] = data4 & 0xFF; data4 >>= 8u;
g.data4[3] = data4 & 0xFF; data4 >>= 8u;
g.data4[4] = data4 & 0xFF; data4 >>= 8u;
g.data4[5] = data4 & 0xFF; data4 >>= 8u;
g.data4[6] = data4 & 0xFF; data4 >>= 8u;
g.data4[7] = data4 & 0xFF;
if (braces)
is.get ();
return is;
}