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 debug/dwarf, type UintType struct
pkg debug/dwarf, type UintType struct, embedded BasicType
pkg debug/dwarf, type VoidType struct
pkg debug/dwarf, type VoidType struct, embedded CommonType
pkg debug/elf, const ARM_MAGIC_TRAMP_NUMBER ideal-int
pkg debug/elf, const DF_BIND_NOW DynFlag
pkg debug/elf, const DF_ORIGIN DynFlag
pkg debug/elf, const DF_STATIC_TLS DynFlag
pkg debug/elf, const DF_SYMBOLIC DynFlag

pkg debug/dwarf, const TagVariant = 25
pkg debug/dwarf, const TagVariantPart = 51
pkg debug/dwarf, const TagVolatileType = 53
pkg debug/dwarf, const TagWithStmt = 34
pkg debug/elf, const ARM_MAGIC_TRAMP_NUMBER = 1543503875
pkg debug/elf, const DF_BIND_NOW = 8
pkg debug/elf, const DF_ORIGIN = 1
pkg debug/elf, const DF_STATIC_TLS = 16
pkg debug/elf, const DF_SYMBOLIC = 2
pkg debug/elf, const DF_TEXTREL = 4