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/*
* Copyright 2015, Mozilla Foundation and contributors
*
* 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.
*/
#ifndef __BigEndian_h__
#define __BigEndian_h__
#include <stdint.h>
namespace mozilla {
class BigEndian {
public:
static uint32_t readUint32(const void* aPtr) {
const uint8_t* p = reinterpret_cast<const uint8_t*>(aPtr);
return uint32_t(p[0]) << 24 | uint32_t(p[1]) << 16 | uint32_t(p[2]) << 8 |
uint32_t(p[3]);
}
static uint16_t readUint16(const void* aPtr) {
const uint8_t* p = reinterpret_cast<const uint8_t*>(aPtr);
return uint32_t(p[0]) << 8 | uint32_t(p[1]);
}
static uint64_t readUint64(const void* aPtr) {
const uint8_t* p = reinterpret_cast<const uint8_t*>(aPtr);
return uint64_t(p[0]) << 56 | uint64_t(p[1]) << 48 | uint64_t(p[2]) << 40 |
uint64_t(p[3]) << 32 | uint64_t(p[4]) << 24 | uint64_t(p[5]) << 16 |
uint64_t(p[6]) << 8 | uint64_t(p[7]);
}
static void writeUint64(void* aPtr, uint64_t aValue) {
uint8_t* p = reinterpret_cast<uint8_t*>(aPtr);
p[0] = uint8_t(aValue >> 56) & 0xff;
p[1] = uint8_t(aValue >> 48) & 0xff;
p[2] = uint8_t(aValue >> 40) & 0xff;
p[3] = uint8_t(aValue >> 32) & 0xff;
p[4] = uint8_t(aValue >> 24) & 0xff;
p[5] = uint8_t(aValue >> 16) & 0xff;
p[6] = uint8_t(aValue >> 8) & 0xff;
p[7] = uint8_t(aValue) & 0xff;
}
};
} // namespace mozilla
#endif // __BigEndian_h__
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