}

	// Guess the magic values.
	magic := string(b.toUSTAR().magic())
	version := string(b.toUSTAR().version())
	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
	}
}

		return err
	}

	b := readBuf(buf)
	if sig := b.uint32(); sig != directory64EndSignature {
		return ErrFormat
	}

	b = b[12:]                        // skip dir size, version and version needed (uint64 + 2x uint16)
	d.diskNbr = b.uint32()            // number of this disk
	d.dirDiskNbr = b.uint32()         // number of the disk with the start of the central directory

	directory64EndLen        = 56         // + extra

	// Constants for the first byte in CreatorVersion.
	creatorFAT    = 0
	creatorUnix   = 3
	creatorNTFS   = 11
	creatorVFAT   = 14
	creatorMacOSX = 19

	// Version numbers.
	zipVersion20 = 20 // 2.0
	zipVersion45 = 45 // 4.5 (reads and writes zip64 archives)

	// Limits for non zip64 files.
	uint16max = (1 << 16) - 1
	uint32max = (1 << 32) - 1

	// Extra header IDs.
	//

	}
	return as, true
}

// contains reports whether c is inside the set.
func (as *asciiSet) contains(c byte) bool {
	return (as[c/32] & (1 << (c % 32))) != 0
}

// containsRune is a simplified version of strings.ContainsRune
// to avoid importing the strings package.
// We avoid bytes.ContainsRune to avoid allocating a temporary copy of s.
func containsRune(s string, r rune) bool {
	for _, c := range s {
		if c == r {

means that if a header file foo/bar.h exists both in the source
directory and also in the system include directory (or some other place
specified by a -I flag), then "#include <foo/bar.h>" will always find the
local version in preference to any other version.

The cgo tool is enabled by default for native builds on systems where
it is expected to work. It is disabled by default when cross-compiling

		}},
	}, {
		// This archive was generated by Writer but is readable by both
		// GNU and BSD tar utilities.
		// The archive generated by GNU is nearly byte-for-byte identical
		// to the Go version except the Go version sets a negative Devminor
		// just to force the GNU format.
		file: "testdata/gnu-utf8.tar",
		headers: []*Header{{
			Name: "☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹☺☻☹",
			Mode: 0644,

	"strings"
	"time"
)

// BUG: Use of the Uid and Gid fields in Header could overflow on 32-bit
// architectures. If a large value is encountered when decoding, the result
// stored in Header will be the truncated version.

var tarinsecurepath = godebug.New("tarinsecurepath")

var (
	ErrHeader          = errors.New("archive/tar: invalid tar header")
	ErrWriteTooLong    = errors.New("archive/tar: write too long")

// Reset is the same as [Buffer.Truncate](0).
func (b *Buffer) Reset() {
	b.buf = b.buf[:0]
	b.off = 0
	b.lastRead = opInvalid
}

// tryGrowByReslice is an inlineable version of grow for the fast-case where the
// internal buffer only needs to be resliced.
// It returns the index where bytes should be written and whether it succeeded.
func (b *Buffer) tryGrowByReslice(n int) (int, bool) {

func Test386EndToEnd(t *testing.T) {
	testEndToEnd(t, "386", "386")
}

func TestARMEndToEnd(t *testing.T) {
	defer func(old int) { buildcfg.GOARM.Version = old }(buildcfg.GOARM.Version)
	for _, goarm := range []int{5, 6, 7} {
		t.Logf("GOARM=%d", goarm)
		buildcfg.GOARM.Version = goarm
		testEndToEnd(t, "arm", "arm")
		if goarm == 6 {
			testEndToEnd(t, "arm", "armv6")
		}
	}
}

		return "", errors.New("failed to parse ideviceinfo output")
	}
	verSplit := strings.Split(iosVer, ".")
	if len(verSplit) > 2 {
		// Developer images are specific to major.minor ios version.
		// Cut off the patch version.
		iosVer = strings.Join(verSplit[:2], ".")
	}
	sdkBase := "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport"