libcruft-util/fourcc.cpp

75 lines
1.7 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 "fourcc.hpp"
using util::fourcc;
using std::ostream;
static_assert (sizeof(fourcc) == 4, "fourcc must be a 4 byte POD");
fourcc
fourcc::from_chars (uint8_t a, uint8_t b, uint8_t c, uint8_t d) {
fourcc lhs;
lhs.data[0] = a;
lhs.data[1] = b;
lhs.data[2] = c;
lhs.data[3] = d;
return lhs;
}
fourcc
fourcc::from_string (const char data[4]) {
fourcc lhs;
lhs.data[0] = static_cast<uint8_t> (data[0]);
lhs.data[1] = static_cast<uint8_t> (data[1]);
lhs.data[2] = static_cast<uint8_t> (data[2]);
lhs.data[3] = static_cast<uint8_t> (data[3]);
return lhs;
}
bool
fourcc::operator== (const char rhs[4]) const {
return data[0] == rhs[0] &&
data[1] == rhs[1] &&
data[2] == rhs[2] &&
data[3] == rhs[3];
}
fourcc::operator uint32_t (void) const {
return static_cast<uint32_t> (data[0] << 24U |
data[1] << 16U |
data[2] << 8U |
data[3]);
}
ostream&
operator<< (ostream &os, fourcc f) {
os << f.data[0] << f.data[1] << f.data[2] << f.data[3];
return os;
}