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init.go
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init.go
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/*
Copyright 2016 The TensorFlow Authors. All Rights Reserved.
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.
*/
package v4l2
import (
"encoding/binary"
"unsafe"
)
// nativeEndian is the byte order for the local platform. Used to send back and
// V4L2 structs with the C API. We test for endianness at runtime because
// some architectures can be booted into different endian modes.
var nativeEndian binary.ByteOrder
func init() {
buf := [2]byte{}
*(*uint16)(unsafe.Pointer(&buf[0])) = uint16(0xABCD)
switch buf {
case [2]byte{0xCD, 0xAB}:
nativeEndian = binary.LittleEndian
case [2]byte{0xAB, 0xCD}:
nativeEndian = binary.BigEndian
default:
panic("Could not determine native endianness.")
}
}