}
		return
	}
	fmt.Fprintf(w, "%s%s\n", prefix, bytes.TrimSpace(out))
}

// firstLine returns the first line of a given byte slice.
func firstLine(buf []byte) []byte {
	idx := bytes.IndexByte(buf, '\n')
	if idx > 0 {
		buf = buf[:idx]
	}
	return bytes.TrimSpace(buf)
}

// printGlibcVersion prints information about the glibc version.
// It ignores failures.

// always true.
func UnescapeString(s string) string {
	populateMapsOnce.Do(populateMaps)
	i := strings.IndexByte(s, '&')

	if i < 0 {
		return s
	}

	b := []byte(s)
	dst, src := unescapeEntity(b, i, i)
	for len(s[src:]) > 0 {
		if s[src] == '&' {
			i = 0
		} else {
			i = strings.IndexByte(s[src:], '&')
		}
		if i < 0 {
			dst += copy(b[dst:], s[src:])
			break
		}

		Count: make(map[string]uint64),
	}
	np := round(len(hdrPrefix), 4)
	hdrLen := *(*uint32)(unsafe.Pointer(&data[np]))
	if hdrLen > pageSize {
		return corrupt()
	}
	meta := data[np+4 : hdrLen]
	if i := bytes.IndexByte(meta, 0); i >= 0 {
		meta = meta[:i]
	}
	m := &mappedFile{
		meta:    string(meta),
		hdrLen:  hdrLen,
		mapping: &mmap.Data{Data: data},
	}

	lines := strings.Split(m.meta, "\n")

	if len(name) >= grpcWebLen && strings.EqualFold(name[:grpcWebLen], grpcWeb) {
		return protocol.GRPCWeb
	}

	// Parse the port name to find the prefix, if any.
	i := strings.IndexByte(name, '-')
	if i >= 0 {
		name = name[:i]
	}

	p := protocol.Parse(name)
	if p == protocol.Unsupported {
		// Make TCP as default protocol for well know ports if protocol is not specified.

	"encoding/binary"
	"fmt"
	"internal/saferio"
	"io"
)

// cstring converts ASCII byte sequence b to string.
// It stops once it finds 0 or reaches end of b.
func cstring(b []byte) string {
	i := bytes.IndexByte(b, 0)
	if i == -1 {
		i = len(b)
	}
	return string(b[:i])
}

// StringTable is a COFF string table.
type StringTable []byte

func readStringTable(fh *FileHeader, r io.ReadSeeker) (StringTable, error) {

	// per https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/.
	if vol := filepath.VolumeName(path); vol != "" {
		if strings.HasPrefix(vol, `\\`) {
			path = filepath.ToSlash(path[2:])
			i := strings.IndexByte(path, '/')

			if i < 0 {
				// A degenerate case.
				// \\host.example.com (without a share name)
				// becomes
				// file://host.example.com/
				return &url.URL{
					Scheme: "file",
					Host:   path,

	buf.WriteString("\n\n// Code generated by go generate; DO NOT EDIT.\n\npackage suffixarray\n")

	for {
		x := bytes.Index(data, []byte("\nfunc "))
		if x < 0 {
			break
		}
		data = data[x:]
		p := bytes.IndexByte(data, '(')
		if p < 0 {
			p = len(data)
		}
		name := string(data[len("\nfunc "):p])

		x = bytes.Index(data, []byte("\n}\n"))
		if x < 0 {
			log.Fatalf("cannot find end of func %s", name)
		}

		}
	}

	return string(p)
}

// PrefixToPath is the inverse of PathToPrefix, replacing escape sequences with
// the original character.
func PrefixToPath(s string) (string, error) {
	percent := strings.IndexByte(s, '%')
	if percent == -1 {
		return s, nil
	}

	p := make([]byte, 0, len(s))
	for i := 0; i < len(s); {
		if s[i] != '%' {
			p = append(p, s[i])
			i++
			continue
		}
		if i+2 >= len(s) {

// Copyright 2018 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.

#include "go_asm.h"
#include "textflag.h"

TEXT ·IndexByte(SB), NOSPLIT, $0-40
	I64Load b_base+0(FP)
	I32WrapI64
	I32Load8U c+24(FP)
	I64Load b_len+8(FP)
	I32WrapI64
	Call memchr<>(SB)
	I64ExtendI32S
	Set R0

	Get SP
	I64Const $-1
	Get R0
	I64Load b_base+0(FP)

	}
	p := &pattern{str: s, method: method}

	if found {
		off = len(method) + 1
	}
	i := strings.IndexByte(rest, '/')
	if i < 0 {
		return nil, errors.New("host/path missing /")
	}
	p.host = rest[:i]
	rest = rest[i:]
	if j := strings.IndexByte(p.host, '{'); j >= 0 {
		off += j
		return nil, errors.New("host contains '{' (missing initial '/'?)")
	}