[chore] remove vendor

1 files changed, 0 insertions, 1405 deletions

diff --git a/vendor/github.com/miekg/dns/scan.go b/vendor/github.com/miekg/dns/scan.go
deleted file mode 100644
index e26e8027a..000000000
--- a/vendor/github.com/miekg/dns/scan.go
+++ /dev/null
@@ -1,1405 +0,0 @@
-package dns
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"io/fs"
-	"os"
-	"path"
-	"path/filepath"
-	"strconv"
-	"strings"
-)
-
-const maxTok = 512 // Token buffer start size, and growth size amount.
-
-// The maximum depth of $INCLUDE directives supported by the
-// ZoneParser API.
-const maxIncludeDepth = 7
-
-// Tokenize a RFC 1035 zone file. The tokenizer will normalize it:
-// * Add ownernames if they are left blank;
-// * Suppress sequences of spaces;
-// * Make each RR fit on one line (_NEWLINE is send as last)
-// * Handle comments: ;
-// * Handle braces - anywhere.
-const (
-	// Zonefile
-	zEOF = iota
-	zString
-	zBlank
-	zQuote
-	zNewline
-	zRrtpe
-	zOwner
-	zClass
-	zDirOrigin   // $ORIGIN
-	zDirTTL      // $TTL
-	zDirInclude  // $INCLUDE
-	zDirGenerate // $GENERATE
-
-	// Privatekey file
-	zValue
-	zKey
-
-	zExpectOwnerDir      // Ownername
-	zExpectOwnerBl       // Whitespace after the ownername
-	zExpectAny           // Expect rrtype, ttl or class
-	zExpectAnyNoClass    // Expect rrtype or ttl
-	zExpectAnyNoClassBl  // The whitespace after _EXPECT_ANY_NOCLASS
-	zExpectAnyNoTTL      // Expect rrtype or class
-	zExpectAnyNoTTLBl    // Whitespace after _EXPECT_ANY_NOTTL
-	zExpectRrtype        // Expect rrtype
-	zExpectRrtypeBl      // Whitespace BEFORE rrtype
-	zExpectRdata         // The first element of the rdata
-	zExpectDirTTLBl      // Space after directive $TTL
-	zExpectDirTTL        // Directive $TTL
-	zExpectDirOriginBl   // Space after directive $ORIGIN
-	zExpectDirOrigin     // Directive $ORIGIN
-	zExpectDirIncludeBl  // Space after directive $INCLUDE
-	zExpectDirInclude    // Directive $INCLUDE
-	zExpectDirGenerate   // Directive $GENERATE
-	zExpectDirGenerateBl // Space after directive $GENERATE
-)
-
-// ParseError is a parsing error. It contains the parse error and the location in the io.Reader
-// where the error occurred.
-type ParseError struct {
-	file       string
-	err        string
-	wrappedErr error
-	lex        lex
-}
-
-func (e *ParseError) Error() (s string) {
-	if e.file != "" {
-		s = e.file + ": "
-	}
-	if e.err == "" && e.wrappedErr != nil {
-		e.err = e.wrappedErr.Error()
-	}
-	s += "dns: " + e.err + ": " + strconv.QuoteToASCII(e.lex.token) + " at line: " +
-		strconv.Itoa(e.lex.line) + ":" + strconv.Itoa(e.lex.column)
-	return
-}
-
-func (e *ParseError) Unwrap() error { return e.wrappedErr }
-
-type lex struct {
-	token  string // text of the token
-	err    bool   // when true, token text has lexer error
-	value  uint8  // value: zString, _BLANK, etc.
-	torc   uint16 // type or class as parsed in the lexer, we only need to look this up in the grammar
-	line   int    // line in the file
-	column int    // column in the file
-}
-
-// ttlState describes the state necessary to fill in an omitted RR TTL
-type ttlState struct {
-	ttl           uint32 // ttl is the current default TTL
-	isByDirective bool   // isByDirective indicates whether ttl was set by a $TTL directive
-}
-
-// NewRR reads a string s and returns the first RR.
-// If s contains no records, NewRR will return nil with no error.
-//
-// The class defaults to IN, TTL defaults to 3600, and
-// origin for resolving relative domain names defaults to the DNS root (.).
-// Full zone file syntax is supported, including directives like $TTL and $ORIGIN.
-// All fields of the returned RR are set from the read data, except RR.Header().Rdlength which is set to 0.
-func NewRR(s string) (RR, error) {
-	if len(s) > 0 && s[len(s)-1] != '\n' { // We need a closing newline
-		return ReadRR(strings.NewReader(s+"\n"), "")
-	}
-	return ReadRR(strings.NewReader(s), "")
-}
-
-// ReadRR reads the RR contained in r.
-//
-// The string file is used in error reporting and to resolve relative
-// $INCLUDE directives.
-//
-// See NewRR for more documentation.
-func ReadRR(r io.Reader, file string) (RR, error) {
-	zp := NewZoneParser(r, ".", file)
-	zp.SetDefaultTTL(defaultTtl)
-	zp.SetIncludeAllowed(true)
-	rr, _ := zp.Next()
-	return rr, zp.Err()
-}
-
-// ZoneParser is a parser for an RFC 1035 style zonefile.
-//
-// Each parsed RR in the zone is returned sequentially from Next. An
-// optional comment can be retrieved with Comment.
-//
-// The directives $INCLUDE, $ORIGIN, $TTL and $GENERATE are all
-// supported. Although $INCLUDE is disabled by default.
-// Note that $GENERATE's range support up to a maximum of 65535 steps.
-//
-// Basic usage pattern when reading from a string (z) containing the
-// zone data:
-//
-//	zp := NewZoneParser(strings.NewReader(z), "", "")
-//
-//	for rr, ok := zp.Next(); ok; rr, ok = zp.Next() {
-//		// Do something with rr
-//	}
-//
-//	if err := zp.Err(); err != nil {
-//		// log.Println(err)
-//	}
-//
-// Comments specified after an RR (and on the same line!) are
-// returned too:
-//
-//	foo. IN A 10.0.0.1 ; this is a comment
-//
-// The text "; this is comment" is returned from Comment. Comments inside
-// the RR are returned concatenated along with the RR. Comments on a line
-// by themselves are discarded.
-//
-// Callers should not assume all returned data in an Resource Record is
-// syntactically correct, e.g. illegal base64 in RRSIGs will be returned as-is.
-type ZoneParser struct {
-	c *zlexer
-
-	parseErr *ParseError
-
-	origin string
-	file   string
-
-	defttl *ttlState
-
-	h RR_Header
-
-	// sub is used to parse $INCLUDE files and $GENERATE directives.
-	// Next, by calling subNext, forwards the resulting RRs from this
-	// sub parser to the calling code.
-	sub  *ZoneParser
-	r    io.Reader
-	fsys fs.FS
-
-	includeDepth uint8
-
-	includeAllowed     bool
-	generateDisallowed bool
-}
-
-// NewZoneParser returns an RFC 1035 style zonefile parser that reads
-// from r.
-//
-// The string file is used in error reporting and to resolve relative
-// $INCLUDE directives. The string origin is used as the initial
-// origin, as if the file would start with an $ORIGIN directive.
-func NewZoneParser(r io.Reader, origin, file string) *ZoneParser {
-	var pe *ParseError
-	if origin != "" {
-		origin = Fqdn(origin)
-		if _, ok := IsDomainName(origin); !ok {
-			pe = &ParseError{file: file, err: "bad initial origin name"}
-		}
-	}
-
-	return &ZoneParser{
-		c: newZLexer(r),
-
-		parseErr: pe,
-
-		origin: origin,
-		file:   file,
-	}
-}
-
-// SetDefaultTTL sets the parsers default TTL to ttl.
-func (zp *ZoneParser) SetDefaultTTL(ttl uint32) {
-	zp.defttl = &ttlState{ttl, false}
-}
-
-// SetIncludeAllowed controls whether $INCLUDE directives are
-// allowed. $INCLUDE directives are not supported by default.
-//
-// The $INCLUDE directive will open and read from a user controlled
-// file on the system. Even if the file is not a valid zonefile, the
-// contents of the file may be revealed in error messages, such as:
-//
-//	/etc/passwd: dns: not a TTL: "root:x:0:0:root:/root:/bin/bash" at line: 1:31
-//	/etc/shadow: dns: not a TTL: "root:$6$<redacted>::0:99999:7:::" at line: 1:125
-func (zp *ZoneParser) SetIncludeAllowed(v bool) {
-	zp.includeAllowed = v
-}
-
-// SetIncludeFS provides an [fs.FS] to use when looking for the target of
-// $INCLUDE directives.  ($INCLUDE must still be enabled separately by calling
-// [ZoneParser.SetIncludeAllowed].)  If fsys is nil, [os.Open] will be used.
-//
-// When fsys is an on-disk FS, the ability of $INCLUDE to reach files from
-// outside its root directory depends upon the FS implementation.  For
-// instance, [os.DirFS] will refuse to open paths like "../../etc/passwd",
-// however it will still follow links which may point anywhere on the system.
-//
-// FS paths are slash-separated on all systems, even Windows.  $INCLUDE paths
-// containing other characters such as backslash and colon may be accepted as
-// valid, but those characters will never be interpreted by an FS
-// implementation as path element separators.  See [fs.ValidPath] for more
-// details.
-func (zp *ZoneParser) SetIncludeFS(fsys fs.FS) {
-	zp.fsys = fsys
-}
-
-// Err returns the first non-EOF error that was encountered by the
-// ZoneParser.
-func (zp *ZoneParser) Err() error {
-	if zp.parseErr != nil {
-		return zp.parseErr
-	}
-
-	if zp.sub != nil {
-		if err := zp.sub.Err(); err != nil {
-			return err
-		}
-	}
-
-	return zp.c.Err()
-}
-
-func (zp *ZoneParser) setParseError(err string, l lex) (RR, bool) {
-	zp.parseErr = &ParseError{file: zp.file, err: err, lex: l}
-	return nil, false
-}
-
-// Comment returns an optional text comment that occurred alongside
-// the RR.
-func (zp *ZoneParser) Comment() string {
-	if zp.parseErr != nil {
-		return ""
-	}
-
-	if zp.sub != nil {
-		return zp.sub.Comment()
-	}
-
-	return zp.c.Comment()
-}
-
-func (zp *ZoneParser) subNext() (RR, bool) {
-	if rr, ok := zp.sub.Next(); ok {
-		return rr, true
-	}
-
-	if zp.sub.r != nil {
-		if c, ok := zp.sub.r.(io.Closer); ok {
-			c.Close()
-		}
-		zp.sub.r = nil
-	}
-
-	if zp.sub.Err() != nil {
-		// We have errors to surface.
-		return nil, false
-	}
-
-	zp.sub = nil
-	return zp.Next()
-}
-
-// Next advances the parser to the next RR in the zonefile and
-// returns the (RR, true). It will return (nil, false) when the
-// parsing stops, either by reaching the end of the input or an
-// error. After Next returns (nil, false), the Err method will return
-// any error that occurred during parsing.
-func (zp *ZoneParser) Next() (RR, bool) {
-	if zp.parseErr != nil {
-		return nil, false
-	}
-	if zp.sub != nil {
-		return zp.subNext()
-	}
-
-	// 6 possible beginnings of a line (_ is a space):
-	//
-	//   0. zRRTYPE                              -> all omitted until the rrtype
-	//   1. zOwner _ zRrtype                     -> class/ttl omitted
-	//   2. zOwner _ zString _ zRrtype           -> class omitted
-	//   3. zOwner _ zString _ zClass  _ zRrtype -> ttl/class
-	//   4. zOwner _ zClass  _ zRrtype           -> ttl omitted
-	//   5. zOwner _ zClass  _ zString _ zRrtype -> class/ttl (reversed)
-	//
-	// After detecting these, we know the zRrtype so we can jump to functions
-	// handling the rdata for each of these types.
-
-	st := zExpectOwnerDir // initial state
-	h := &zp.h
-
-	for l, ok := zp.c.Next(); ok; l, ok = zp.c.Next() {
-		// zlexer spotted an error already
-		if l.err {
-			return zp.setParseError(l.token, l)
-		}
-
-		switch st {
-		case zExpectOwnerDir:
-			// We can also expect a directive, like $TTL or $ORIGIN
-			if zp.defttl != nil {
-				h.Ttl = zp.defttl.ttl
-			}
-
-			h.Class = ClassINET
-
-			switch l.value {
-			case zNewline:
-				st = zExpectOwnerDir
-			case zOwner:
-				name, ok := toAbsoluteName(l.token, zp.origin)
-				if !ok {
-					return zp.setParseError("bad owner name", l)
-				}
-
-				h.Name = name
-
-				st = zExpectOwnerBl
-			case zDirTTL:
-				st = zExpectDirTTLBl
-			case zDirOrigin:
-				st = zExpectDirOriginBl
-			case zDirInclude:
-				st = zExpectDirIncludeBl
-			case zDirGenerate:
-				st = zExpectDirGenerateBl
-			case zRrtpe:
-				h.Rrtype = l.torc
-
-				st = zExpectRdata
-			case zClass:
-				h.Class = l.torc
-
-				st = zExpectAnyNoClassBl
-			case zBlank:
-				// Discard, can happen when there is nothing on the
-				// line except the RR type
-			case zString:
-				ttl, ok := stringToTTL(l.token)
-				if !ok {
-					return zp.setParseError("not a TTL", l)
-				}
-
-				h.Ttl = ttl
-
-				if zp.defttl == nil || !zp.defttl.isByDirective {
-					zp.defttl = &ttlState{ttl, false}
-				}
-
-				st = zExpectAnyNoTTLBl
-			default:
-				return zp.setParseError("syntax error at beginning", l)
-			}
-		case zExpectDirIncludeBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank after $INCLUDE-directive", l)
-			}
-
-			st = zExpectDirInclude
-		case zExpectDirInclude:
-			if l.value != zString {
-				return zp.setParseError("expecting $INCLUDE value, not this...", l)
-			}
-
-			neworigin := zp.origin // There may be optionally a new origin set after the filename, if not use current one
-			switch l, _ := zp.c.Next(); l.value {
-			case zBlank:
-				l, _ := zp.c.Next()
-				if l.value == zString {
-					name, ok := toAbsoluteName(l.token, zp.origin)
-					if !ok {
-						return zp.setParseError("bad origin name", l)
-					}
-
-					neworigin = name
-				}
-			case zNewline, zEOF:
-				// Ok
-			default:
-				return zp.setParseError("garbage after $INCLUDE", l)
-			}
-
-			if !zp.includeAllowed {
-				return zp.setParseError("$INCLUDE directive not allowed", l)
-			}
-			if zp.includeDepth >= maxIncludeDepth {
-				return zp.setParseError("too deeply nested $INCLUDE", l)
-			}
-
-			// Start with the new file
-			includePath := l.token
-			var r1 io.Reader
-			var e1 error
-			if zp.fsys != nil {
-				// fs.FS always uses / as separator, even on Windows, so use
-				// path instead of filepath here:
-				if !path.IsAbs(includePath) {
-					includePath = path.Join(path.Dir(zp.file), includePath)
-				}
-
-				// os.DirFS, and probably others, expect all paths to be
-				// relative, so clean the path and remove leading / if
-				// present:
-				includePath = strings.TrimLeft(path.Clean(includePath), "/")
-
-				r1, e1 = zp.fsys.Open(includePath)
-			} else {
-				if !filepath.IsAbs(includePath) {
-					includePath = filepath.Join(filepath.Dir(zp.file), includePath)
-				}
-				r1, e1 = os.Open(includePath)
-			}
-			if e1 != nil {
-				var as string
-				if includePath != l.token {
-					as = fmt.Sprintf(" as `%s'", includePath)
-				}
-				zp.parseErr = &ParseError{
-					file:       zp.file,
-					wrappedErr: fmt.Errorf("failed to open `%s'%s: %w", l.token, as, e1),
-					lex:        l,
-				}
-				return nil, false
-			}
-
-			zp.sub = NewZoneParser(r1, neworigin, includePath)
-			zp.sub.defttl, zp.sub.includeDepth, zp.sub.r = zp.defttl, zp.includeDepth+1, r1
-			zp.sub.SetIncludeAllowed(true)
-			zp.sub.SetIncludeFS(zp.fsys)
-			return zp.subNext()
-		case zExpectDirTTLBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank after $TTL-directive", l)
-			}
-
-			st = zExpectDirTTL
-		case zExpectDirTTL:
-			if l.value != zString {
-				return zp.setParseError("expecting $TTL value, not this...", l)
-			}
-
-			if err := slurpRemainder(zp.c); err != nil {
-				return zp.setParseError(err.err, err.lex)
-			}
-
-			ttl, ok := stringToTTL(l.token)
-			if !ok {
-				return zp.setParseError("expecting $TTL value, not this...", l)
-			}
-
-			zp.defttl = &ttlState{ttl, true}
-
-			st = zExpectOwnerDir
-		case zExpectDirOriginBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank after $ORIGIN-directive", l)
-			}
-
-			st = zExpectDirOrigin
-		case zExpectDirOrigin:
-			if l.value != zString {
-				return zp.setParseError("expecting $ORIGIN value, not this...", l)
-			}
-
-			if err := slurpRemainder(zp.c); err != nil {
-				return zp.setParseError(err.err, err.lex)
-			}
-
-			name, ok := toAbsoluteName(l.token, zp.origin)
-			if !ok {
-				return zp.setParseError("bad origin name", l)
-			}
-
-			zp.origin = name
-
-			st = zExpectOwnerDir
-		case zExpectDirGenerateBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank after $GENERATE-directive", l)
-			}
-
-			st = zExpectDirGenerate
-		case zExpectDirGenerate:
-			if zp.generateDisallowed {
-				return zp.setParseError("nested $GENERATE directive not allowed", l)
-			}
-			if l.value != zString {
-				return zp.setParseError("expecting $GENERATE value, not this...", l)
-			}
-
-			return zp.generate(l)
-		case zExpectOwnerBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank after owner", l)
-			}
-
-			st = zExpectAny
-		case zExpectAny:
-			switch l.value {
-			case zRrtpe:
-				if zp.defttl == nil {
-					return zp.setParseError("missing TTL with no previous value", l)
-				}
-
-				h.Rrtype = l.torc
-
-				st = zExpectRdata
-			case zClass:
-				h.Class = l.torc
-
-				st = zExpectAnyNoClassBl
-			case zString:
-				ttl, ok := stringToTTL(l.token)
-				if !ok {
-					return zp.setParseError("not a TTL", l)
-				}
-
-				h.Ttl = ttl
-
-				if zp.defttl == nil || !zp.defttl.isByDirective {
-					zp.defttl = &ttlState{ttl, false}
-				}
-
-				st = zExpectAnyNoTTLBl
-			default:
-				return zp.setParseError("expecting RR type, TTL or class, not this...", l)
-			}
-		case zExpectAnyNoClassBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank before class", l)
-			}
-
-			st = zExpectAnyNoClass
-		case zExpectAnyNoTTLBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank before TTL", l)
-			}
-
-			st = zExpectAnyNoTTL
-		case zExpectAnyNoTTL:
-			switch l.value {
-			case zClass:
-				h.Class = l.torc
-
-				st = zExpectRrtypeBl
-			case zRrtpe:
-				h.Rrtype = l.torc
-
-				st = zExpectRdata
-			default:
-				return zp.setParseError("expecting RR type or class, not this...", l)
-			}
-		case zExpectAnyNoClass:
-			switch l.value {
-			case zString:
-				ttl, ok := stringToTTL(l.token)
-				if !ok {
-					return zp.setParseError("not a TTL", l)
-				}
-
-				h.Ttl = ttl
-
-				if zp.defttl == nil || !zp.defttl.isByDirective {
-					zp.defttl = &ttlState{ttl, false}
-				}
-
-				st = zExpectRrtypeBl
-			case zRrtpe:
-				h.Rrtype = l.torc
-
-				st = zExpectRdata
-			default:
-				return zp.setParseError("expecting RR type or TTL, not this...", l)
-			}
-		case zExpectRrtypeBl:
-			if l.value != zBlank {
-				return zp.setParseError("no blank before RR type", l)
-			}
-
-			st = zExpectRrtype
-		case zExpectRrtype:
-			if l.value != zRrtpe {
-				return zp.setParseError("unknown RR type", l)
-			}
-
-			h.Rrtype = l.torc
-
-			st = zExpectRdata
-		case zExpectRdata:
-			var (
-				rr             RR
-				parseAsRFC3597 bool
-			)
-			if newFn, ok := TypeToRR[h.Rrtype]; ok {
-				rr = newFn()
-				*rr.Header() = *h
-
-				// We may be parsing a known RR type using the RFC3597 format.
-				// If so, we handle that here in a generic way.
-				//
-				// This is also true for PrivateRR types which will have the
-				// RFC3597 parsing done for them and the Unpack method called
-				// to populate the RR instead of simply deferring to Parse.
-				if zp.c.Peek().token == "\\#" {
-					parseAsRFC3597 = true
-				}
-			} else {
-				rr = &RFC3597{Hdr: *h}
-			}
-
-			_, isPrivate := rr.(*PrivateRR)
-			if !isPrivate && zp.c.Peek().token == "" {
-				// This is a dynamic update rr.
-
-				if err := slurpRemainder(zp.c); err != nil {
-					return zp.setParseError(err.err, err.lex)
-				}
-
-				return rr, true
-			} else if l.value == zNewline {
-				return zp.setParseError("unexpected newline", l)
-			}
-
-			parseAsRR := rr
-			if parseAsRFC3597 {
-				parseAsRR = &RFC3597{Hdr: *h}
-			}
-
-			if err := parseAsRR.parse(zp.c, zp.origin); err != nil {
-				// err is a concrete *ParseError without the file field set.
-				// The setParseError call below will construct a new
-				// *ParseError with file set to zp.file.
-
-				// err.lex may be nil in which case we substitute our current
-				// lex token.
-				if err.lex == (lex{}) {
-					return zp.setParseError(err.err, l)
-				}
-
-				return zp.setParseError(err.err, err.lex)
-			}
-
-			if parseAsRFC3597 {
-				err := parseAsRR.(*RFC3597).fromRFC3597(rr)
-				if err != nil {
-					return zp.setParseError(err.Error(), l)
-				}
-			}
-
-			return rr, true
-		}
-	}
-
-	// If we get here, we and the h.Rrtype is still zero, we haven't parsed anything, this
-	// is not an error, because an empty zone file is still a zone file.
-	return nil, false
-}
-
-type zlexer struct {
-	br io.ByteReader
-
-	readErr error
-
-	line   int
-	column int
-
-	comBuf  string
-	comment string
-
-	l       lex
-	cachedL *lex
-
-	brace  int
-	quote  bool
-	space  bool
-	commt  bool
-	rrtype bool
-	owner  bool
-
-	nextL bool
-
-	eol bool // end-of-line
-}
-
-func newZLexer(r io.Reader) *zlexer {
-	br, ok := r.(io.ByteReader)
-	if !ok {
-		br = bufio.NewReaderSize(r, 1024)
-	}
-
-	return &zlexer{
-		br: br,
-
-		line: 1,
-
-		owner: true,
-	}
-}
-
-func (zl *zlexer) Err() error {
-	if zl.readErr == io.EOF {
-		return nil
-	}
-
-	return zl.readErr
-}
-
-// readByte returns the next byte from the input
-func (zl *zlexer) readByte() (byte, bool) {
-	if zl.readErr != nil {
-		return 0, false
-	}
-
-	c, err := zl.br.ReadByte()
-	if err != nil {
-		zl.readErr = err
-		return 0, false
-	}
-
-	// delay the newline handling until the next token is delivered,
-	// fixes off-by-one errors when reporting a parse error.
-	if zl.eol {
-		zl.line++
-		zl.column = 0
-		zl.eol = false
-	}
-
-	if c == '\n' {
-		zl.eol = true
-	} else {
-		zl.column++
-	}
-
-	return c, true
-}
-
-func (zl *zlexer) Peek() lex {
-	if zl.nextL {
-		return zl.l
-	}
-
-	l, ok := zl.Next()
-	if !ok {
-		return l
-	}
-
-	if zl.nextL {
-		// Cache l. Next returns zl.cachedL then zl.l.
-		zl.cachedL = &l
-	} else {
-		// In this case l == zl.l, so we just tell Next to return zl.l.
-		zl.nextL = true
-	}
-
-	return l
-}
-
-func (zl *zlexer) Next() (lex, bool) {
-	l := &zl.l
-	switch {
-	case zl.cachedL != nil:
-		l, zl.cachedL = zl.cachedL, nil
-		return *l, true
-	case zl.nextL:
-		zl.nextL = false
-		return *l, true
-	case l.err:
-		// Parsing errors should be sticky.
-		return lex{value: zEOF}, false
-	}
-
-	var (
-		str = make([]byte, maxTok) // Hold string text
-		com = make([]byte, maxTok) // Hold comment text
-
-		stri int // Offset in str (0 means empty)
-		comi int // Offset in com (0 means empty)
-
-		escape bool
-	)
-
-	if zl.comBuf != "" {
-		comi = copy(com[:], zl.comBuf)
-		zl.comBuf = ""
-	}
-
-	zl.comment = ""
-
-	for x, ok := zl.readByte(); ok; x, ok = zl.readByte() {
-		l.line, l.column = zl.line, zl.column
-
-		if stri >= len(str) {
-			// if buffer length is insufficient, increase it.
-			str = append(str[:], make([]byte, maxTok)...)
-		}
-		if comi >= len(com) {
-			// if buffer length is insufficient, increase it.
-			com = append(com[:], make([]byte, maxTok)...)
-		}
-
-		switch x {
-		case ' ', '\t':
-			if escape || zl.quote {
-				// Inside quotes or escaped this is legal.
-				str[stri] = x
-				stri++
-
-				escape = false
-				break
-			}
-
-			if zl.commt {
-				com[comi] = x
-				comi++
-				break
-			}
-
-			var retL lex
-			if stri == 0 {
-				// Space directly in the beginning, handled in the grammar
-			} else if zl.owner {
-				// If we have a string and it's the first, make it an owner
-				l.value = zOwner
-				l.token = string(str[:stri])
-
-				// escape $... start with a \ not a $, so this will work
-				switch strings.ToUpper(l.token) {
-				case "$TTL":
-					l.value = zDirTTL
-				case "$ORIGIN":
-					l.value = zDirOrigin
-				case "$INCLUDE":
-					l.value = zDirInclude
-				case "$GENERATE":
-					l.value = zDirGenerate
-				}
-
-				retL = *l
-			} else {
-				l.value = zString
-				l.token = string(str[:stri])
-
-				if !zl.rrtype {
-					tokenUpper := strings.ToUpper(l.token)
-					if t, ok := StringToType[tokenUpper]; ok {
-						l.value = zRrtpe
-						l.torc = t
-
-						zl.rrtype = true
-					} else if strings.HasPrefix(tokenUpper, "TYPE") {
-						t, ok := typeToInt(l.token)
-						if !ok {
-							l.token = "unknown RR type"
-							l.err = true
-							return *l, true
-						}
-
-						l.value = zRrtpe
-						l.torc = t
-
-						zl.rrtype = true
-					}
-
-					if t, ok := StringToClass[tokenUpper]; ok {
-						l.value = zClass
-						l.torc = t
-					} else if strings.HasPrefix(tokenUpper, "CLASS") {
-						t, ok := classToInt(l.token)
-						if !ok {
-							l.token = "unknown class"
-							l.err = true
-							return *l, true
-						}
-
-						l.value = zClass
-						l.torc = t
-					}
-				}
-
-				retL = *l
-			}
-
-			zl.owner = false
-
-			if !zl.space {
-				zl.space = true
-
-				l.value = zBlank
-				l.token = " "
-
-				if retL == (lex{}) {
-					return *l, true
-				}
-
-				zl.nextL = true
-			}
-
-			if retL != (lex{}) {
-				return retL, true
-			}
-		case ';':
-			if escape || zl.quote {
-				// Inside quotes or escaped this is legal.
-				str[stri] = x
-				stri++
-
-				escape = false
-				break
-			}
-
-			zl.commt = true
-			zl.comBuf = ""
-
-			if comi > 1 {
-				// A newline was previously seen inside a comment that
-				// was inside braces and we delayed adding it until now.
-				com[comi] = ' ' // convert newline to space
-				comi++
-				if comi >= len(com) {
-					l.token = "comment length insufficient for parsing"
-					l.err = true
-					return *l, true
-				}
-			}
-
-			com[comi] = ';'
-			comi++
-
-			if stri > 0 {
-				zl.comBuf = string(com[:comi])
-
-				l.value = zString
-				l.token = string(str[:stri])
-				return *l, true
-			}
-		case '\r':
-			escape = false
-
-			if zl.quote {
-				str[stri] = x
-				stri++
-			}
-
-			// discard if outside of quotes
-		case '\n':
-			escape = false
-
-			// Escaped newline
-			if zl.quote {
-				str[stri] = x
-				stri++
-				break
-			}
-
-			if zl.commt {
-				// Reset a comment
-				zl.commt = false
-				zl.rrtype = false
-
-				// If not in a brace this ends the comment AND the RR
-				if zl.brace == 0 {
-					zl.owner = true
-
-					l.value = zNewline
-					l.token = "\n"
-					zl.comment = string(com[:comi])
-					return *l, true
-				}
-
-				zl.comBuf = string(com[:comi])
-				break
-			}
-
-			if zl.brace == 0 {
-				// If there is previous text, we should output it here
-				var retL lex
-				if stri != 0 {
-					l.value = zString
-					l.token = string(str[:stri])
-
-					if !zl.rrtype {
-						tokenUpper := strings.ToUpper(l.token)
-						if t, ok := StringToType[tokenUpper]; ok {
-							zl.rrtype = true
-
-							l.value = zRrtpe
-							l.torc = t
-						}
-					}
-
-					retL = *l
-				}
-
-				l.value = zNewline
-				l.token = "\n"
-
-				zl.comment = zl.comBuf
-				zl.comBuf = ""
-				zl.rrtype = false
-				zl.owner = true
-
-				if retL != (lex{}) {
-					zl.nextL = true
-					return retL, true
-				}
-
-				return *l, true
-			}
-		case '\\':
-			// comments do not get escaped chars, everything is copied
-			if zl.commt {
-				com[comi] = x
-				comi++
-				break
-			}
-
-			// something already escaped must be in string
-			if escape {
-				str[stri] = x
-				stri++
-
-				escape = false
-				break
-			}
-
-			// something escaped outside of string gets added to string
-			str[stri] = x
-			stri++
-
-			escape = true
-		case '"':
-			if zl.commt {
-				com[comi] = x
-				comi++
-				break
-			}
-
-			if escape {
-				str[stri] = x
-				stri++
-
-				escape = false
-				break
-			}
-
-			zl.space = false
-
-			// send previous gathered text and the quote
-			var retL lex
-			if stri != 0 {
-				l.value = zString
-				l.token = string(str[:stri])
-
-				retL = *l
-			}
-
-			// send quote itself as separate token
-			l.value = zQuote
-			l.token = "\""
-
-			zl.quote = !zl.quote
-
-			if retL != (lex{}) {
-				zl.nextL = true
-				return retL, true
-			}
-
-			return *l, true
-		case '(', ')':
-			if zl.commt {
-				com[comi] = x
-				comi++
-				break
-			}
-
-			if escape || zl.quote {
-				// Inside quotes or escaped this is legal.
-				str[stri] = x
-				stri++
-
-				escape = false
-				break
-			}
-
-			switch x {
-			case ')':
-				zl.brace--
-
-				if zl.brace < 0 {
-					l.token = "extra closing brace"
-					l.err = true
-					return *l, true
-				}
-			case '(':
-				zl.brace++
-			}
-		default:
-			escape = false
-
-			if zl.commt {
-				com[comi] = x
-				comi++
-				break
-			}
-
-			str[stri] = x
-			stri++
-
-			zl.space = false
-		}
-	}
-
-	if zl.readErr != nil && zl.readErr != io.EOF {
-		// Don't return any tokens after a read error occurs.
-		return lex{value: zEOF}, false
-	}
-
-	var retL lex
-	if stri > 0 {
-		// Send remainder of str
-		l.value = zString
-		l.token = string(str[:stri])
-		retL = *l
-
-		if comi <= 0 {
-			return retL, true
-		}
-	}
-
-	if comi > 0 {
-		// Send remainder of com
-		l.value = zNewline
-		l.token = "\n"
-		zl.comment = string(com[:comi])
-
-		if retL != (lex{}) {
-			zl.nextL = true
-			return retL, true
-		}
-
-		return *l, true
-	}
-
-	if zl.brace != 0 {
-		l.token = "unbalanced brace"
-		l.err = true
-		return *l, true
-	}
-
-	return lex{value: zEOF}, false
-}
-
-func (zl *zlexer) Comment() string {
-	if zl.l.err {
-		return ""
-	}
-
-	return zl.comment
-}
-
-// Extract the class number from CLASSxx
-func classToInt(token string) (uint16, bool) {
-	offset := 5
-	if len(token) < offset+1 {
-		return 0, false
-	}
-	class, err := strconv.ParseUint(token[offset:], 10, 16)
-	if err != nil {
-		return 0, false
-	}
-	return uint16(class), true
-}
-
-// Extract the rr number from TYPExxx
-func typeToInt(token string) (uint16, bool) {
-	offset := 4
-	if len(token) < offset+1 {
-		return 0, false
-	}
-	typ, err := strconv.ParseUint(token[offset:], 10, 16)
-	if err != nil {
-		return 0, false
-	}
-	return uint16(typ), true
-}
-
-// stringToTTL parses things like 2w, 2m, etc, and returns the time in seconds.
-func stringToTTL(token string) (uint32, bool) {
-	var s, i uint32
-	for _, c := range token {
-		switch c {
-		case 's', 'S':
-			s += i
-			i = 0
-		case 'm', 'M':
-			s += i * 60
-			i = 0
-		case 'h', 'H':
-			s += i * 60 * 60
-			i = 0
-		case 'd', 'D':
-			s += i * 60 * 60 * 24
-			i = 0
-		case 'w', 'W':
-			s += i * 60 * 60 * 24 * 7
-			i = 0
-		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
-			i *= 10
-			i += uint32(c) - '0'
-		default:
-			return 0, false
-		}
-	}
-	return s + i, true
-}
-
-// Parse LOC records' <digits>[.<digits>][mM] into a
-// mantissa exponent format. Token should contain the entire
-// string (i.e. no spaces allowed)
-func stringToCm(token string) (e, m uint8, ok bool) {
-	if token[len(token)-1] == 'M' || token[len(token)-1] == 'm' {
-		token = token[0 : len(token)-1]
-	}
-
-	var (
-		meters, cmeters, val int
-		err                  error
-	)
-	mStr, cmStr, hasCM := strings.Cut(token, ".")
-	if hasCM {
-		// There's no point in having more than 2 digits in this part, and would rather make the implementation complicated ('123' should be treated as '12').
-		// So we simply reject it.
-		// We also make sure the first character is a digit to reject '+-' signs.
-		cmeters, err = strconv.Atoi(cmStr)
-		if err != nil || len(cmStr) > 2 || cmStr[0] < '0' || cmStr[0] > '9' {
-			return
-		}
-		if len(cmStr) == 1 {
-			// 'nn.1' must be treated as 'nn-meters and 10cm, not 1cm.
-			cmeters *= 10
-		}
-	}
-	// This slightly ugly condition will allow omitting the 'meter' part, like .01 (meaning 0.01m = 1cm).
-	if !hasCM || mStr != "" {
-		meters, err = strconv.Atoi(mStr)
-		// RFC1876 states the max value is 90000000.00.  The latter two conditions enforce it.
-		if err != nil || mStr[0] < '0' || mStr[0] > '9' || meters > 90000000 || (meters == 90000000 && cmeters != 0) {
-			return
-		}
-	}
-
-	if meters > 0 {
-		e = 2
-		val = meters
-	} else {
-		e = 0
-		val = cmeters
-	}
-	for val >= 10 {
-		e++
-		val /= 10
-	}
-	return e, uint8(val), true
-}
-
-func toAbsoluteName(name, origin string) (absolute string, ok bool) {
-	// check for an explicit origin reference
-	if name == "@" {
-		// require a nonempty origin
-		if origin == "" {
-			return "", false
-		}
-		return origin, true
-	}
-
-	// require a valid domain name
-	_, ok = IsDomainName(name)
-	if !ok || name == "" {
-		return "", false
-	}
-
-	// check if name is already absolute
-	if IsFqdn(name) {
-		return name, true
-	}
-
-	// require a nonempty origin
-	if origin == "" {
-		return "", false
-	}
-	return appendOrigin(name, origin), true
-}
-
-func appendOrigin(name, origin string) string {
-	if origin == "." {
-		return name + origin
-	}
-	return name + "." + origin
-}
-
-// LOC record helper function
-func locCheckNorth(token string, latitude uint32) (uint32, bool) {
-	if latitude > 90*1000*60*60 {
-		return latitude, false
-	}
-	switch token {
-	case "n", "N":
-		return LOC_EQUATOR + latitude, true
-	case "s", "S":
-		return LOC_EQUATOR - latitude, true
-	}
-	return latitude, false
-}
-
-// LOC record helper function
-func locCheckEast(token string, longitude uint32) (uint32, bool) {
-	if longitude > 180*1000*60*60 {
-		return longitude, false
-	}
-	switch token {
-	case "e", "E":
-		return LOC_EQUATOR + longitude, true
-	case "w", "W":
-		return LOC_EQUATOR - longitude, true
-	}
-	return longitude, false
-}
-
-// "Eat" the rest of the "line"
-func slurpRemainder(c *zlexer) *ParseError {
-	l, _ := c.Next()
-	switch l.value {
-	case zBlank:
-		l, _ = c.Next()
-		if l.value != zNewline && l.value != zEOF {
-			return &ParseError{err: "garbage after rdata", lex: l}
-		}
-	case zNewline:
-	case zEOF:
-	default:
-		return &ParseError{err: "garbage after rdata", lex: l}
-	}
-	return nil
-}
-
-// Parse a 64 bit-like ipv6 address: "0014:4fff:ff20:ee64"
-// Used for NID and L64 record.
-func stringToNodeID(l lex) (uint64, *ParseError) {
-	if len(l.token) < 19 {
-		return 0, &ParseError{file: l.token, err: "bad NID/L64 NodeID/Locator64", lex: l}
-	}
-	// There must be three colons at fixes positions, if not its a parse error
-	if l.token[4] != ':' && l.token[9] != ':' && l.token[14] != ':' {
-		return 0, &ParseError{file: l.token, err: "bad NID/L64 NodeID/Locator64", lex: l}
-	}
-	s := l.token[0:4] + l.token[5:9] + l.token[10:14] + l.token[15:19]
-	u, err := strconv.ParseUint(s, 16, 64)
-	if err != nil {
-		return 0, &ParseError{file: l.token, err: "bad NID/L64 NodeID/Locator64", lex: l}
-	}
-	return u, nil
-}