It is an error to list a `godebug` with an unrecognized setting.
(Toolchains older than Go 1.23 reject all `godebug` lines, since they do not
understand `godebug` at all.) When a workspace is in use, `godebug`
directives in `go.mod` files are ignored, and `go.work` will be consulted
for `godebug` directives instead.

The defaults from the `go` and `godebug` lines apply to all main
packages that are built. For more fine-grained control,

package zip

import (
	"bufio"
	"encoding/binary"
	"errors"
	"fmt"
	"hash"
	"hash/crc32"
	"internal/godebug"
	"io"
	"io/fs"
	"os"
	"path"
	"path/filepath"
	"slices"
	"strings"
	"sync"
	"time"
)

var zipinsecurepath = godebug.New("zipinsecurepath")

var (
	ErrFormat       = errors.New("zip: not a valid zip file")

	github.com/jessevdk/go-flags v1.6.1 // indirect
	github.com/josharian/intern v1.0.0 // indirect
	github.com/juju/ratelimit v1.0.2 // indirect
	github.com/kr/fs v0.1.0 // indirect
	github.com/kylelemons/godebug v1.1.0 // indirect
	github.com/lestrrat-go/blackmagic v1.0.2 // indirect
	github.com/lestrrat-go/httpcc v1.0.1 // indirect
	github.com/lestrrat-go/httprc v1.0.6 // indirect
	github.com/lestrrat-go/iter v1.0.2 // indirect

		}
		if got := fi.ModTime(); !got.Equal(test.want) {
			t.Errorf("%s: got modtime %v, want %v", test.name, got, test.want)
		}
	}
}

func TestCVE202127919(t *testing.T) {
	t.Setenv("GODEBUG", "zipinsecurepath=0")
	// Archive containing only the file "../test.txt"
	data := []byte{
		0x50, 0x4b, 0x03, 0x04, 0x14, 0x00, 0x08, 0x00,
		0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

import (
	"errors"
	"fmt"
	"internal/godebug"
	"io/fs"
	"maps"
	"math"
	"path"
	"reflect"
	"strconv"
	"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 (

// built-in function recover.
//
// Starting in Go 1.21, calling panic with a nil interface value or an
// untyped nil causes a run-time error (a different panic).
// The GODEBUG setting panicnil=1 disables the run-time error.
func panic(v any)

// The recover built-in function allows a program to manage behavior of a
// panicking goroutine. Executing a call to recover inside a deferred

memory points, and so on) is pinned.

These rules are checked dynamically at runtime. The checking is
controlled by the cgocheck setting of the GODEBUG environment
variable. The default setting is GODEBUG=cgocheck=1, which implements
reasonably cheap dynamic checks. These checks may be disabled
entirely using GODEBUG=cgocheck=0. Complete checking of pointer
handling, at some cost in run time, is available by setting
GOEXPERIMENT=cgocheck2 at build time.

				}
			default:
				t.Fatalf("test %d.%d, unknown test operation: %T", i, j, tf)
			}
		}
	}
}

func TestInsecurePaths(t *testing.T) {
	t.Setenv("GODEBUG", "tarinsecurepath=0")
	for _, path := range []string{
		"../foo",
		"/foo",
		"a/b/../../../c",
	} {
		var buf bytes.Buffer
		tw := NewWriter(&buf)
		tw.WriteHeader(&Header{
			Name: path,

// Any remaining data in the current file is automatically discarded.
// At the end of the archive, Next returns the error io.EOF.
//
// If Next encounters a non-local name (as defined by [filepath.IsLocal])
// and the GODEBUG environment variable contains `tarinsecurepath=0`,
// Next returns the header with an [ErrInsecurePath] error.
// A future version of Go may introduce this behavior by default.

github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
github.com/ledongthuc/pdf v0.0.0-20220302134840-0c2507a12d80/go.mod h1:imJHygn/1yfhB7XSJJKlFZKl/J+dCPAknuiaGOshXAs=