"crypto/md5"
	"encoding/hex"
	"encoding/pem"
	"errors"
	"io"
	"strings"
)

type PEMCipher int

// Possible values for the EncryptPEMBlock encryption algorithm.
const (
	_ PEMCipher = iota
	PEMCipherDES
	PEMCipher3DES
	PEMCipherAES128
	PEMCipherAES192
	PEMCipherAES256
)

// rfc1423Algo holds a method for enciphering a PEM block.
type rfc1423Algo struct {
	cipher     PEMCipher

package ssa

import (
	"cmd/compile/internal/base"
	"cmd/compile/internal/types"
	"fmt"
)

type indVarFlags uint8

const (
	indVarMinExc    indVarFlags = 1 << iota // minimum value is exclusive (default: inclusive)
	indVarMaxInc                            // maximum value is inclusive (default: exclusive)

	n := data.Len()
	if n <= 1 {
		return
	}
	limit := bits.Len(uint(n))
	pdqsort(data, 0, n, limit)
}

type sortedHint int // hint for pdqsort when choosing the pivot

const (
	unknownHint sortedHint = iota
	increasingHint
	decreasingHint
)

// xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf
type xorshift uint64

func (r *xorshift) Next() uint64 {
	*r ^= *r << 13
	*r ^= *r >> 17

	formfeed = whiteSpace('\f')
	indent   = whiteSpace('>')
	unindent = whiteSpace('<')
)

// A pmode value represents the current printer mode.
type pmode int

const (
	noExtraBlank     pmode = 1 << iota // disables extra blank after /*-style comment
	noExtraLinebreak                   // disables extra line break after /*-style comment
)

type commentInfo struct {
	cindex         int               // current comment index

	scope         *Scope                 // top-most scope for lookups
	pos           token.Pos              // if valid, identifiers are looked up as if at position pos (used by Eval)
	iota          constant.Value         // value of iota in a constant declaration; nil otherwise
	errpos        positioner             // if set, identifier position of a constant with inherited initializer

// It is okay to ignore the return value of any particular
// call to scanner.state: if one call returns scanError,
// every subsequent call will return scanError too.
const (
	// Continue.
	scanContinue     = iota // uninteresting byte
	scanBeginLiteral        // end implied by next result != scanContinue
	scanBeginObject         // begin object
	scanObjectKey           // just finished object key (string)

//   - bool, for JSON booleans
//   - float64, for JSON numbers
//   - [Number], for JSON numbers
//   - string, for JSON string literals
//   - nil, for JSON null
type Token any

const (
	tokenTopValue = iota
	tokenArrayStart
	tokenArrayValue
	tokenArrayComma
	tokenObjectStart
	tokenObjectKey
	tokenObjectColon
	tokenObjectValue
	tokenObjectComma
)

	"⁣":                  "\u2063",
	"⁢":                  "\u2062",
	"Į":                           "\u012e",
	"𝕀":                            "\U0001d540",
	"Ι":                            "\u0399",
	"ℐ":                            "\u2110",
	"Ĩ":                          "\u0128",
	"І":                           "\u0406",

//	1<<0 (lookupTried) : symbol lookup was performed
//	1<<1 (lookupFailed): symbol lookup was performed but failed
type symbolizeFlag uint8

const (
	lookupTried  symbolizeFlag = 1 << iota
	lookupFailed symbolizeFlag = 1 << iota
)

const (
	// message Profile
	tagProfile_SampleType        = 1  // repeated ValueType
	tagProfile_Sample            = 2  // repeated Sample
	tagProfile_Mapping           = 3  // repeated Mapping

	Type  EntryType
	Mtime int64
	Uid   int
	Gid   int
	Mode  os.FileMode
	Data
	Obj *GoObj // nil if this entry is not a Go object file
}

type EntryType int

const (
	EntryPkgDef EntryType = iota
	EntryGoObj
	EntryNativeObj
	EntrySentinelNonObj
)

func (e *Entry) String() string {
	return fmt.Sprintf("%s %6d/%-6d %12d %s %s",
		(e.Mode & 0777).String(),
		e.Uid,
		e.Gid,
		e.Size,