vendor/golang.org/x/sys/unix/dirent.go

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris

package unix

import "unsafe"

// readInt returns the size-bytes unsigned integer in native byte order at offset off.
func readInt(b []byte, off, size uintptr) (u uint64, ok bool) {
	if len(b) < int(off+size) {
		return 0, false
	}
	if isBigEndian {
		return readIntBE(b[off:], size), true
	}
	return readIntLE(b[off:], size), true
}

func readIntBE(b []byte, size uintptr) uint64 {
	switch size {
	case 1:
		return uint64(b[0])
	case 2:
		_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
		return uint64(b[1]) | uint64(b[0])<<8
	case 4:
		_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
		return uint64(b[3]) | uint64(b[2])<<8 | uint64(b[1])<<16 | uint64(b[0])<<24
	case 8:
		_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
		return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
			uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
	default:
		panic("syscall: readInt with unsupported size")
	}
}

func readIntLE(b []byte, size uintptr) uint64 {
	switch size {
	case 1:
		return uint64(b[0])
	case 2:
		_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
		return uint64(b[0]) | uint64(b[1])<<8
	case 4:
		_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
		return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24
	case 8:
		_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
		return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
			uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
	default:
		panic("syscall: readInt with unsupported size")
	}
}

// ParseDirent parses up to max directory entries in buf,