mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-12-02 09:04:54 +00:00
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
/*
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* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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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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package bytes
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import (
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"encoding/binary"
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"unsafe"
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)
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// Raw returns just the bytes without any assumptions about layout.
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type Raw interface {
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Raw() *[]byte
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}
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// Reader used to read various data sizes in the byte array.
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type Reader interface {
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Read8(pos int) uint8
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Read16(pos int) uint16
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Read32(pos int) uint32
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Read64(pos int) uint64
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Len() int
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}
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// Writer used to write various sizes of data in the byte array.
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type Writer interface {
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Write8(pos int, value uint8)
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Write16(pos int, value uint16)
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Write32(pos int, value uint32)
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Write64(pos int, value uint64)
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Len() int
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}
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// Bytes object for manipulating arbitrary byte arrays.
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type Bytes interface {
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Raw
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Reader
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Writer
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Slice(offset int, size int) Bytes
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LittleEndian() Bytes
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BigEndian() Bytes
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}
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var nativeByteOrder binary.ByteOrder
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func init() {
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buf := [2]byte{}
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*(*uint16)(unsafe.Pointer(&buf[0])) = uint16(0x00FF)
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switch buf {
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case [2]byte{0xFF, 0x00}:
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nativeByteOrder = binary.LittleEndian
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case [2]byte{0x00, 0xFF}:
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nativeByteOrder = binary.BigEndian
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default:
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panic("Unable to infer byte order")
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}
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}
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// New raw bytearray.
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func New(data *[]byte) Bytes {
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return (*native)(data)
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}
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// NewLittleEndian little endian ordering of bytes.
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func NewLittleEndian(data *[]byte) Bytes {
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if nativeByteOrder == binary.LittleEndian {
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return (*native)(data)
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}
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return (*swapbo)(data)
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}
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// NewBigEndian big endian ordering of bytes.
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func NewBigEndian(data *[]byte) Bytes {
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if nativeByteOrder == binary.BigEndian {
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return (*native)(data)
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}
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return (*swapbo)(data)
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}
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