trailer := string(b.toSTAR().trailer())
	switch {
	case magic == magicUSTAR && trailer == trailerSTAR:
		return formatSTAR
	case magic == magicUSTAR:
		return FormatUSTAR | FormatPAX
	case magic == magicGNU && version == versionGNU:
		return FormatGNU
	default:
		return formatV7
	}
}

// setFormat writes the magic values necessary for specified format
// and then updates the checksum accordingly.

# Treat all files in the Go repo as binary, with no git magic updating
# line endings. This produces predictable results in different environments.
#
# Windows users contributing to Go will need to use a modern version
# of git and editors capable of LF line endings.
#
# Windows .bat files are known to have multiple bugs when run with LF
# endings, and so they are checked in with CRLF endings, with a test

pkg debug/macho, type FatArchHeader struct, SubCpu uint32
pkg debug/macho, type FatFile struct
pkg debug/macho, type FatFile struct, Arches []FatArch
pkg debug/macho, type FatFile struct, Magic uint32
pkg debug/macho, var ErrNotFat *FormatError
pkg debug/pe, type DataDirectory struct
pkg debug/pe, type DataDirectory struct, Size uint32
pkg debug/pe, type DataDirectory struct, VirtualAddress uint32

}

func TestZip64EdgeCase(t *testing.T) {
	if testing.Short() {
		t.Skip("slow test; skipping")
	}
	t.Parallel()
	// Test a zip file with uncompressed size 0xFFFFFFFF.
	// That's the magic marker for a 64-bit file, so even though
	// it fits in a 32-bit field we must use the 64-bit field.
	// Go 1.5 and earlier got this wrong,
	// writing an invalid zip file.

pkg syscall (linux-386), const LINUX_REBOOT_CMD_RESTART2 ideal-int
pkg syscall (linux-386), const LINUX_REBOOT_CMD_SW_SUSPEND ideal-int
pkg syscall (linux-386), const LINUX_REBOOT_MAGIC1 ideal-int
pkg syscall (linux-386), const LINUX_REBOOT_MAGIC2 ideal-int
pkg syscall (linux-386), const LOCK_EX ideal-int
pkg syscall (linux-386), const LOCK_NB ideal-int
pkg syscall (linux-386), const LOCK_SH ideal-int

pkg syscall (linux-386), const LINUX_REBOOT_CMD_RESTART2 = 2712847316
pkg syscall (linux-386), const LINUX_REBOOT_CMD_SW_SUSPEND = 3489725666
pkg syscall (linux-386), const LINUX_REBOOT_MAGIC1 = 4276215469
pkg syscall (linux-386), const LINUX_REBOOT_MAGIC2 = 672274793
pkg syscall (linux-386), const LOCK_EX = 2
pkg syscall (linux-386), const LOCK_NB = 4
pkg syscall (linux-386), const LOCK_SH = 1

pkg syscall (linux-arm-cgo), const LINUX_REBOOT_CMD_RESTART2 ideal-int
pkg syscall (linux-arm-cgo), const LINUX_REBOOT_CMD_SW_SUSPEND ideal-int
pkg syscall (linux-arm-cgo), const LINUX_REBOOT_MAGIC1 ideal-int
pkg syscall (linux-arm-cgo), const LINUX_REBOOT_MAGIC2 ideal-int
pkg syscall (linux-arm-cgo), const LOCK_EX ideal-int
pkg syscall (linux-arm-cgo), const LOCK_NB ideal-int
pkg syscall (linux-arm-cgo), const LOCK_SH ideal-int