69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
/*
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* Copyright 2015, Mozilla Foundation and contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __BigEndian_h__
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#define __BigEndian_h__
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#include <stdint.h>
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namespace mozilla {
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class BigEndian {
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public:
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static uint32_t readUint32(const void* aPtr) {
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const uint8_t* p = reinterpret_cast<const uint8_t*>(aPtr);
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return uint32_t(p[0]) << 24 |
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uint32_t(p[1]) << 16 |
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uint32_t(p[2]) << 8 |
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uint32_t(p[3]);
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}
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static uint16_t readUint16(const void* aPtr) {
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const uint8_t* p = reinterpret_cast<const uint8_t*>(aPtr);
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return uint32_t(p[0]) << 8 |
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uint32_t(p[1]);
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}
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static uint64_t readUint64(const void* aPtr) {
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const uint8_t* p = reinterpret_cast<const uint8_t*>(aPtr);
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return uint64_t(p[0]) << 56 |
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uint64_t(p[1]) << 48 |
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uint64_t(p[2]) << 40 |
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uint64_t(p[3]) << 32 |
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uint64_t(p[4]) << 24 |
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uint64_t(p[5]) << 16 |
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uint64_t(p[6]) << 8 |
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uint64_t(p[7]);
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}
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static void writeUint64(void* aPtr, uint64_t aValue) {
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uint8_t* p = reinterpret_cast<uint8_t*>(aPtr);
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p[0] = uint8_t(aValue >> 56) & 0xff;
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p[1] = uint8_t(aValue >> 48) & 0xff;
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p[2] = uint8_t(aValue >> 40) & 0xff;
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p[3] = uint8_t(aValue >> 32) & 0xff;
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p[4] = uint8_t(aValue >> 24) & 0xff;
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p[5] = uint8_t(aValue >> 16) & 0xff;
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p[6] = uint8_t(aValue >> 8) & 0xff;
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p[7] = uint8_t(aValue) & 0xff;
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}
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};
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} // namespace mozilla
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#endif // __BigEndian_h__
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