How to Determine Endianness in Go without Sacrificing Safety?

A Comprehensive Solution for Determining Endianness in Go

In order to determine the endianness of a machine, one may consider employing the following Go code:

<code class="go">var i int = 0x0100
ptr := unsafe.Pointer(&i)
if 0x01 == *(*byte)(ptr) {
    fmt.Println("Big Endian")
} else if 0x00 == *(*byte)(ptr) {
    fmt.Println("Little Endian")
} else {
    // ...
}</code>

However, this approach relies on the unsafe package, which can lead to non-portable and potentially unsafe code. Fortunately, the TensorFlow API for Go provides an alternative solution that also utilizes the unsafe package but in a more robust manner:

<code class="go">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.")
    }
}</code>

This code snippet takes advantage of the fact that a uint16 can be stored in a 2-byte buffer, and the order of the bytes will depend on the endianness of the system. By examining the arrangement of the bytes in the buffer, the code determines the system's endianness and sets the nativeEndian variable accordingly.

Utilizing this method provides a more reliable way to check endianness in Go while still adhering to the limitations imposed by the unsafe package.

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