github.com/suiyunonghen/DxCommonLib@v0.5.3/strfuncs.go

/*
公用包
Autor: 不得闲
QQ:75492895
*/
package DxCommonLib

import (
	"bytes"
	"encoding/binary"
	"errors"
	"fmt"
	"golang.org/x/text/encoding/simplifiedchinese"
	"golang.org/x/text/transform"
	"io"
	"math"
	"os"
	"reflect"
	"strconv"
	"strings"
	"time"
	"unicode"
	"unicode/utf16"
	"unicode/utf8"
	"unsafe"
)

//CopyMemory 内存拷贝函数
//go:linkname CopyMemory runtime.memmove
func CopyMemory(to, from unsafe.Pointer, n uintptr)

//ZeroMemory 清空内存
//go:linkname ZeroMemory runtime.memclrNoHeapPointers
func ZeroMemory(ptr unsafe.Pointer, n uintptr)

//go:linkname memequal runtime.memequal
func memequal(a, b unsafe.Pointer, size uintptr) bool

//go:linkname memequal_varlen runtime.memequal_varlen
func memequal_varlen(a, b unsafe.Pointer) bool

func Ord(x bool) uint8 {
	// Avoid branches. In the SSA compiler, this compiles to
	// exactly what you would want it to.
	return *(*uint8)(unsafe.Pointer(&x))
}

//CompareMem 内存比较函数
func CompareMem(a, b unsafe.Pointer, size int) bool {
	if size <= 0 {
		return memequal_varlen(a, b)
	}
	return memequal(a, b, uintptr(size))
}

func ZeroByteSlice(bt []byte) {
	btlen := len(bt)
	if btlen > 0 {
		ZeroMemory(unsafe.Pointer(&bt[0]), uintptr(btlen))
	}
}

func ReadAll(r io.Reader) ([]byte, error) {
	b := make([]byte, 0, 512)
	for {
		if len(b) == cap(b) {
			// Add more capacity (let append pick how much).
			b = append(b, 0)[:len(b)]
		}
		n, err := r.Read(b[len(b):cap(b)])
		b = b[:len(b)+n]
		if err != nil {
			if err == io.EOF {
				err = nil
			}
			return b, err
		}
	}
}

func GBKString(str string) ([]byte, error) {
	reader := bytes.NewReader([]byte(str))
	O := transform.NewReader(reader, simplifiedchinese.GBK.NewEncoder())
	d, e := ReadAll(O)
	if e != nil {
		return nil, e
	}
	return d, nil
}

func GBK2Utf8(gbk []byte) ([]byte, error) {
	reader := bytes.NewReader(gbk)
	O := transform.NewReader(reader, simplifiedchinese.GBK.NewDecoder())
	d, e := ReadAll(O)
	if e != nil {
		return nil, e
	}
	return d, nil
}

func PcharLen(dstr uintptr) int {
	if dstr == 0 {
		return 0
	}
	ptr := unsafe.Pointer(dstr)
	for i := 0; ; i++ {
		if 0 == *(*uint16)(ptr) {
			return int(i)
		}
		ptr = unsafe.Pointer(uintptr(ptr) + 2)
	}
	return 0
}

//Pchar2String 将常规的pchar返回到string
func Pchar2String(pcharstr uintptr) string {
	if pcharstr == 0 {
		return ""
	}
	ptr := unsafe.Pointer(pcharstr)
	gbt := make([]uint16, 0, 255)
	for i := 0; ; i++ {
		if 0 == *(*uint16)(ptr) {
			break
		}
		gbt = append(gbt, *(*uint16)(ptr))
		ptr = unsafe.Pointer(uintptr(ptr) + 2)
	}
	return string(utf16.Decode(gbt))
}

func StringFromUtf16Pointer(utf16Addr uintptr, maxlen int) string {
	if utf16Addr == 0 {
		return ""
	}
	for i := 0; i < maxlen; i++ {
		mb := (*uint16)(unsafe.Pointer(uintptr(uint(utf16Addr) + uint(i*2))))
		if *mb == 0 {
			resultb := make([]uint16, i)
			CopyMemory(unsafe.Pointer(&resultb[0]), unsafe.Pointer(utf16Addr), uintptr(i*2))
			return string(utf16.Decode(resultb))
		}
	}
	return ""
}

func FastPchar2String(pcharStr uintptr) string {
	if pcharStr == 0 {
		return ""
	}
	s := new(reflect.SliceHeader)
	s.Data = pcharStr
	s.Len = PcharLen(pcharStr)
	s.Cap = s.Len
	return string(utf16.Decode(*(*[]uint16)(unsafe.Pointer(s))))
}

func FastPByte2ByteSlice(pByte uintptr, byteLen int) []byte {
	s := new(reflect.SliceHeader)
	s.Data = pByte
	s.Len = byteLen
	s.Cap = s.Len
	return *(*[]byte)(unsafe.Pointer(s))
}

//DelphiStringLen 获取Delphi字符串的长度
func DelphiStringLen(delphiString uintptr) (result int32) {
	//Delphi字符串的地址的-4地址位置为长度
	if delphiString == 0 {
		return 0
	}
	result = *(*int32)(unsafe.Pointer(delphiString - 4))
	return
}

/*
FastDelphiString2String 将Delphi的字符串转为Go字符串
因为实际上Delphi的字符串，就是一个指针，这个指针的指向是数据位置，-4位置是长度，-8位置是引用计数，-10位置是每个字符占位个数，-12位置表示的是CodePage编码页
以上是对Unicode的Delphi的，如果是DXE之后的版本就只有到-8，有长度和引用计数，后面的都没有
*/
func FastDelphiString2String(delphiString uintptr, unicodeDelphi bool) string {
	if delphiString == 0 {
		return ""
	}
	dataLen := *(*int32)(unsafe.Pointer(delphiString - 4))
	if dataLen == 0 {
		return ""
	}
	var codePage uint16
	if unicodeDelphi {
		codePage = *(*uint16)(unsafe.Pointer(delphiString - 12))
	} else {
		codePage = 936
	}
	switch codePage {
	case 1200:
		//UTF16编码页
		s := new(reflect.SliceHeader)
		s.Data = delphiString
		s.Len = int(dataLen * 2)
		s.Cap = s.Len
		return string(utf16.Decode(*(*[]uint16)(unsafe.Pointer(s))))
	case 65001:
		//是UTF8的，那么直接开整
		s := make([]byte, dataLen)
		CopyMemory(unsafe.Pointer(&s[0]), unsafe.Pointer(delphiString), uintptr(dataLen))
		return *(*string)(unsafe.Pointer(&s))
	case 936, 20936:
		//gbk的
		s := new(reflect.SliceHeader)
		s.Data = delphiString
		s.Len = int(dataLen)
		s.Cap = s.Len
		if resultUtf8, err := GBK2Utf8(*(*[]byte)(unsafe.Pointer(s))); err == nil {
			return *(*string)(unsafe.Pointer(&resultUtf8))
		}
	case 950:
		//繁体中文
	}
	return ""
}

func FastBytes2Uint16s(bt []byte) []uint16 {
	sliceHead := (*reflect.SliceHeader)(unsafe.Pointer(&bt))
	sliceHead.Len = sliceHead.Len / 2
	sliceHead.Cap = sliceHead.Cap / 2
	return *(*[]uint16)(unsafe.Pointer(sliceHead))
}

//FastString2Byte 本函数只作为强制转换使用，不可将返回的Slice再做修改处理
func FastString2Byte(str string) []byte {
	strHead := (*reflect.StringHeader)(unsafe.Pointer(&str))
	var sliceHead reflect.SliceHeader
	sliceHead.Len = strHead.Len
	sliceHead.Data = strHead.Data
	sliceHead.Cap = strHead.Len
	return *(*[]byte)(unsafe.Pointer(&sliceHead))
}

func StringData(str string) (uintptr, int) {
	strHead := (*reflect.StringHeader)(unsafe.Pointer(&str))
	return strHead.Data, strHead.Len
}

func FastByte2String(bt []byte) string {
	return *(*string)(unsafe.Pointer(&bt))
}

//Utf8String 此函数的返回值不能修改
func Utf8String(utf8Data uintptr, utf8Len int) string {
	var strHead reflect.StringHeader
	strHead.Len = utf8Len
	strHead.Data = utf8Data
	return *(*string)(unsafe.Pointer(&strHead))
}

//Buffer2ByteSlice 返回值不能修改
func Buffer2ByteSlice(Data uintptr, DataLen int) []byte {
	var sliceHead reflect.SliceHeader
	sliceHead.Len = DataLen
	sliceHead.Data = Data
	sliceHead.Cap = DataLen
	return *(*[]byte)(unsafe.Pointer(&sliceHead))
}

//ByteSliceIsPrintString
//判断二进制数组是否是可打印的字符串,如果打印字符的的百分比超过了指定的printPercent， 认为是可显示的Plaintext
//scanStyle 0 表示全扫描,1表示扫描头部10个rune,2表示扫描两头，3表示扫描前中尾
func ByteSliceIsPrintString(Data []byte, scanStyle byte) bool {
	idx := 0
	printC := 0
	runeCount := 0
	DataLen := len(Data)
	if DataLen <= 30 {
		scanStyle = 0
	}
	scanHead := func() bool {
		for idx < DataLen && runeCount < 10 {
			if r, l := utf8.DecodeRune(Data[idx:]); l > 0 {
				idx += l
				runeCount++
				if r == 13 || r == 10 || r == 9 || unicode.IsPrint(r) {
					printC++
				} else if l != DataLen-1 {
					//中间有不可显示的字符
					return false
				}
			} else if l != DataLen-1 {
				//不是最后一个，肯定不是一个有效的可显示的字符串了，
				return false
			}
		}
		return true
	}
	scanEnd := func() bool {
		firstScan := true
		firstDec := 0
		idx = DataLen - 30
		runeCount = 0
		for idx < DataLen && runeCount < 10 {
			if r, l := utf8.DecodeRune(Data[idx:]); l > 0 {
				idx += l
				runeCount++
				if r == 13 || r == 10 || r == 9 || unicode.IsPrint(r) {
					printC++
				} else if l != DataLen-1 {
					//中间有不可显示的字符
					return false
				}
			} else if firstScan {
				idx--
				firstDec++
				if firstDec > 3 {
					return false
				}
			} else if l != DataLen-1 {
				//不是最后一个，肯定不是一个有效的可显示的字符串了，
				return false
			}
		}
		return true
	}

	scanMid := func() bool {
		firstScan := true
		firstDec := 0
		idx = DataLen/3 - 15
		runeCount = 0
		for idx < DataLen && runeCount < 10 {
			if r, l := utf8.DecodeRune(Data[idx:]); l > 0 {
				idx += l
				runeCount++
				if r == 13 || r == 10 || r == 9 || unicode.IsPrint(r) {
					printC++
				} else if l != DataLen-1 {
					//中间有不可显示的字符
					return false
				}
			} else if firstScan {
				idx--
				firstDec++
				if firstDec > 3 {
					return false
				}
			} else if l != DataLen-1 {
				//不是最后一个，肯定不是一个有效的可显示的字符串了，
				return false
			}
		}
		return true
	}
	switch scanStyle {
	case 0:
		for idx < DataLen {
			if r, l := utf8.DecodeRune(Data[idx:]); l > 0 {
				idx += l
				runeCount++
				if r == 13 || r == 10 || r == 9 || unicode.IsPrint(r) {
					printC++
				} else if l != DataLen-1 {
					//中间有不可显示的字符
					return false
				}
			} else if l != DataLen-1 {
				//不是最后一个，肯定不是一个有效的可显示的字符串了，
				return false
			}
		}
	case 1:
		if !scanHead() {
			return false
		}
	case 2:
		//扫描前后
		if !scanHead() {
			return false
		}
		if !scanEnd() {
			return false
		}
	case 3:
		//扫描前中后
		if !scanHead() {
			return false
		}
		if !scanMid() {
			return false
		}
		if !scanEnd() {
			return false
		}
	}
	if runeCount == 0 {
		return true
	}
	percent := 100 * float32(printC/runeCount)
	return percent >= 80
}

func UTF16Byte2string(utf16bt []byte, isBigEnd bool) string {
	if !isBigEnd {
		//判定末尾是否为换行,utf16，识别0
		btlen := len(utf16bt)
		if utf16bt[btlen-1] == 0 && utf16bt[btlen-2] == '\n' {
			utf16bt = utf16bt[:btlen-2]
			btlen -= 2
		} else if utf16bt[btlen-1] == '\n' {
			utf16bt = utf16bt[:btlen-1]
			btlen--
		}
		if utf16bt[btlen-1] == 0 && utf16bt[btlen-2] == '\r' {
			utf16bt = utf16bt[:btlen-2]
		} else if utf16bt[btlen-1] == '\r' {
			utf16bt = utf16bt[:btlen-1]
			btlen--
		}
		return string(utf16.Decode(FastBytes2Uint16s(utf16bt)))
	}
	arrlen := len(utf16bt) / 2
	uint16arr := make([]uint16, arrlen)
	for j, i := 0, 0; j < arrlen; j, i = j+1, i+2 {
		if j == arrlen-1 {
			if utf16bt[i] == '\r' || utf16bt[i+1] == '\r' {
				arrlen--
				break
			}
		} else {
			uint16arr[j] = binary.BigEndian.Uint16(utf16bt[i : i+2])
		}
	}
	return string(utf16.Decode(uint16arr[:arrlen]))
}

func String2Utf16Byte(s string) ([]byte, error) {
	bt, err := UTF16FromString(s)
	if err != nil {
		return nil, err
	}
	btlen := len(bt) * 2
	result := make([]byte, btlen)
	CopyMemory(unsafe.Pointer(&result[0]), unsafe.Pointer(&bt[0]), uintptr(btlen))
	return result, nil
}

func FastString2Utf16Byte(s string) ([]byte, error) {
	bt, err := UTF16FromString(s)
	if err != nil {
		return nil, err
	}
	strHead := (*reflect.SliceHeader)(unsafe.Pointer(&bt))
	var sliceHead reflect.SliceHeader
	sliceHead.Len = strHead.Len * 2
	sliceHead.Data = strHead.Data
	sliceHead.Cap = strHead.Cap * 2
	return *(*[]byte)(unsafe.Pointer(&sliceHead)), nil
}

//ModePermStr2FileMode 将drwxrwx这些转化为 FileMode
func ModePermStr2FileMode(permStr string) (result os.FileMode) {
	result = os.ModePerm
	filemodebytes := []byte(permStr)
	bytelen := len(filemodebytes)
	istart := 0
	if len(permStr) > 9 || filemodebytes[0] == 'd' || filemodebytes[0] == 'l' || filemodebytes[0] == 'p' {
		istart = 1
	}
	if bytelen > istart && filemodebytes[istart] == 'r' {
		result = result | 0400
	} else {
		result = result & 0377
	}
	istart += 1
	if bytelen > istart && filemodebytes[istart] == 'w' {
		result = result | 0200
	} else {
		result = result & 0577
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'x' {
		result = result | 0100
	} else {
		result = result & 0677
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'r' {
		result = result | 0040
	} else {
		result = result & 0737
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'w' {
		result = result | 0020
	} else {
		result = result & 0757
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'x' {
		result = result | 0010
	} else {
		result = result & 0767
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'r' {
		result = result | 0004
	} else {
		result = result & 0773
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'w' {
		result = result | 0002
	} else {
		result = result & 0775
	}
	istart += 1

	if bytelen > istart && filemodebytes[istart] == 'x' {
		result = result | 0001
	} else {
		result = result & 0776
	}

	switch filemodebytes[0] {
	case 'd':
		result = result | os.ModeDir
	case 'l':
		result = result | os.ModeSymlink
	case 'p':
		result = result | os.ModeNamedPipe
	}
	return
}

//EscapeJsonStr 将内容转义成Json字符串
func EscapeJsonStr(str string, EscapeUnicode bool) string {
	return FastByte2String(EscapeJsonbyte(str, EscapeUnicode, nil))
}

func EscapeJsonbyte(str string, EscapeUnicode bool, dst []byte) []byte {
	dstlen := len(dst)
	strlen := len(str)
	if dstlen == 0 {
		dst = make([]byte, 0, strlen*2)
	}
	for _, runedata := range str {
		switch runedata {
		case '\a':
			dst = append(dst, '\\', 'a')
		case '\b':
			dst = append(dst, '\\', 'b')
		case '\f':
			dst = append(dst, '\\', 'f')
		case '\n':
			dst = append(dst, '\\', 'n')
		case '\r':
			dst = append(dst, '\\', 'r')
		case '\t':
			dst = append(dst, '\\', 't')
		case '\v':
			dst = append(dst, '\\', 'v')
		case '\\':
			dst = append(dst, '\\', '\\')
		case '"':
			dst = append(dst, '\\', '"')
		/*case '\'':
		dst = append(dst, '\\','\'')*/
		default:
			if EscapeUnicode {
				switch {
				case runedata < utf8.RuneSelf:
					dst = append(dst, byte(runedata))
				case runedata < ' ':
					dst = append(dst, '\\', 'x')
					dst = append(dst, vhex[byte(runedata)>>4], vhex[byte(runedata)&0xF])
				case runedata > utf8.MaxRune:
					runedata = 0xFFFD
					fallthrough
				case runedata < 0x10000:
					dst = append(dst, `\u`...)
					for s := 12; s >= 0; s -= 4 {
						dst = append(dst, vhex[runedata>>uint(s)&0xF])
					}
				default:
					dst = append(dst, `\U`...)
					for s := 28; s >= 0; s -= 4 {
						dst = append(dst, vhex[runedata>>uint(s)&0xF])
					}
				}
			} else {
				if runedata < utf8.RuneSelf {
					dst = append(dst, byte(runedata))
				} else {
					l := len(dst)
					dst = append(dst, 0, 0, 0, 0)
					n := utf8.EncodeRune(dst[l:l+4], runedata)
					dst = dst[:l+n]
				}
			}
		}
	}
	return dst
}

func UnEscapeStr(bvalue []byte, unEscapeUrl bool, buf []byte) []byte {
	blen := len(bvalue)
	i := 0
	unicodeidx := 0
	escapeType := uint8(0) //0 normal,1 json\escapin,2 unicode escape, 3 % url escape
	for i < blen {
		switch escapeType {
		case 1: //json escapin
			escapeType = 0
			switch bvalue[i] {
			case 'n':
				buf = append(buf, '\n')
			case 'r':
				buf = append(buf, '\r')
			case 't':
				buf = append(buf, '\t')
			case 'a':
				buf = append(buf, '\a')
			case 'b':
				buf = append(buf, '\b')
			case 'f':
				buf = append(buf, '\f')
			case 'v':
				buf = append(buf, '\v')
			case '\\':
				buf = append(buf, '\\')
			case '"':
				buf = append(buf, '"')
			case '\'':
				buf = append(buf, '\'')
			case '/':
				buf = append(buf, '/')
			case 'u':
				escapeType = 2 // unicode decode
				unicodeidx = i
			default:
				buf = append(buf, '\\', bvalue[i])
			}
		case 2: //unicode decode
			if (bvalue[i] >= '0' && bvalue[i] <= '9' || bvalue[i] >= 'a' && bvalue[i] <= 'f' ||
				bvalue[i] >= 'A' && bvalue[i] <= 'F') && i-unicodeidx <= 4 {
				//还是正常的Unicode字符，4个字符为一组
				//escapeType = 2
			} else {
				unicodestr := FastByte2String(bvalue[unicodeidx+1 : i])
				if arune, err := strconv.ParseInt(unicodestr, 16, 32); err == nil {
					l := len(buf)
					buf = append(buf, 0, 0, 0, 0)
					runelen := utf8.EncodeRune(buf[l:l+4], rune(arune))
					buf = buf[:l+runelen]
				} else {
					buf = append(buf, bvalue[unicodeidx:i]...)
				}
				escapeType = 0
				continue
			}
		case 3: //url escape
			for j := 0; j < 3; j++ {
				curidx := j + i
				if (curidx < blen) && (bvalue[curidx] >= '0' && bvalue[curidx] <= '9' || bvalue[curidx] >= 'a' && bvalue[curidx] <= 'f' ||
					bvalue[curidx] >= 'A' && bvalue[curidx] <= 'F') && j < 2 {
					//还是正常的Byte字符，2个字符为一组
					//escapeType = 2
				} else {
					if j < 2 {
						buf = append(buf, bvalue[i-1:curidx]...) //%要加上
					} else {
						bytestr := FastByte2String(bvalue[i:curidx])
						if abyte, err := strconv.ParseInt(bytestr, 16, 32); err == nil {
							if abyte < 0x20 || (abyte >= '0' && abyte <= '9' || abyte >= 'a' && abyte <= 'f' ||
								abyte >= 'A' && abyte <= 'F') {
								buf = append(buf, bvalue[i-1:curidx]...) //%要加上
							} else {
								buf = append(buf, byte(abyte))
							}
						} else {
							buf = append(buf, bvalue[i-1:curidx]...) //%要加上
						}
					}
					escapeType = 0
					i += j - 1
					break
				}
			}
		default: //normal
			switch bvalue[i] {
			case '\\':
				escapeType = 1 //json escapin
			case '%':
				if unEscapeUrl {
					escapeType = 3 // url escape
				} else {
					buf = append(buf, bvalue[i])
				}
			default:
				buf = append(buf, bvalue[i])
			}
		}
		i++
	}
	switch escapeType {
	case 1:
		buf = append(buf, '\\')
	case 2:
		unicodestr := FastByte2String(bvalue[unicodeidx+1 : i])
		if arune, err := strconv.ParseInt(unicodestr, 16, 32); err == nil {
			l := len(buf)
			buf = append(buf, 0, 0, 0, 0)
			runelen := utf8.EncodeRune(buf[l:l+4], rune(arune))
			buf = buf[:l+runelen]
		} else {
			buf = append(buf, bvalue[unicodeidx:i]...)
		}
	case 3:
		buf = append(buf, '%')
	}
	return buf
}

//ParserEscapeStr 解码转义字符，将"\u6821\u56ed\u7f51\t02%20得闲"这类字符串，解码成正常显示的字符串
func ParserEscapeStr(bvalue []byte, unEscapeUrl bool, buf []byte) string {
	return FastByte2String(UnEscapeStr(bvalue, unEscapeUrl, buf))
}

//ParserJsonTime2Go
//Date(1402384458000)
//Date(1224043200000+0800)
func ParserJsonTime2Go(jsontime string) time.Time {
	bt := FastString2Byte(jsontime)
	dtflaglen := 0
	endlen := 0
	if bytes.HasPrefix(bt, []byte{'D', 'a', 't', 'e', '('}) && bytes.HasSuffix(bt, []byte{')'}) {
		dtflaglen = 5
		endlen = 1
	} else if bytes.HasPrefix(bt, []byte{'/', 'D', 'a', 't', 'e', '('}) && bytes.HasSuffix(bt, []byte{')', '/'}) {
		dtflaglen = 6
		endlen = 2
	}
	if dtflaglen > 0 {
		bt = bt[dtflaglen : len(bt)-endlen]
		var (
			ms  int64
			err error
		)
		endlen = 0
		idx := bytes.IndexByte(bt, '+')
		if idx < 0 {
			idx = bytes.IndexByte(bt, '-')
		} else {
			endlen = 1
		}
		if idx < 0 {
			str := FastByte2String(bt[:])
			if ms, err = strconv.ParseInt(str, 10, 64); err != nil {
				return time.Time{}
			}
			if len(str) > 9 {
				ms = ms / 1000
			}
		} else {
			if endlen == 0 {
				endlen = -1
			}
			str := FastByte2String(bt[:idx])
			ms, err = strconv.ParseInt(str, 10, 64)
			if err != nil {
				return time.Time{}
			}
			bt = bt[idx+1:]
			if len(bt) < 2 {
				return time.Time{}
			}
			bt = bt[:2]
			ctz, err := strconv.Atoi(FastByte2String(bt))
			if err != nil {
				return time.Time{}
			}
			if len(str) > 9 {
				ms = ms / 1000
			}
			ms += int64(ctz * 60)
		}
		ntime := time.Now()
		ns := ntime.Unix()
		ntime = ntime.Add((time.Duration(ms-ns) * time.Second))
		return ntime
	}
	return time.Time{}
}

var (
	vhex = [16]byte{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}
)

//Binary2Hex 2进制转到16进制
func Binary2Hex(bt []byte, dst []byte) []byte {
	l := len(dst)
	if len(dst) == 0 {
		dst = make([]byte, 0, l*2)
	}
	for _, vb := range bt {
		dst = append(dst, vhex[vb>>4], vhex[vb&0xF])
	}
	return dst
}

func Bin2Hex(bt []byte) string {
	return FastByte2String(Binary2Hex(bt, nil))
}

//Hex2Binary 16进制到2进制
func Hex2Binary(hexStr string) []byte {
	if hexStr == "" {
		return nil
	}
	vhex := ['G']byte{'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, 'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15}
	btlen := len(hexStr) / 2
	result := make([]byte, btlen)
	btlen = btlen << 1
	jidx := 0
	for i := 0; i < btlen; i += 2 {
		result[jidx] = vhex[hexStr[i]]<<4 | vhex[hexStr[i+1]]
		jidx++
	}
	return result
}

//StrToIntDef From github.com/valyala/fastjson/tree/master/fastfloat
func StrToIntDef(vstr string, defv int64) int64 {
	if v, err := ParseInt64(vstr); err != nil {
		return defv
	} else {
		return v
	}
}

func ParseInt64(s string) (int64, error) {
	if len(s) == 0 {
		return 0, errors.New("cannot parse int64 from empty string")
	}
	i := uint(0)
	minus := s[0] == '-'
	if minus {
		i++
		if i >= uint(len(s)) {
			return 0, fmt.Errorf("cannot parse int64 from %q", s)
		}
	}

	d := int64(0)
	j := i
	for i < uint(len(s)) {
		if s[i] >= '0' && s[i] <= '9' {
			d = d*10 + int64(s[i]-'0')
			i++
			if i > 18 {
				// The integer part may be out of range for int64.
				// Fall back to slow parsing.
				dd, err := strconv.ParseInt(s, 10, 64)
				if err != nil {
					return 0, err
				}
				return dd, nil
			}
			continue
		}
		break
	}
	if i <= j {
		return 0, fmt.Errorf("cannot parse int64 from %q", s)
	}
	if i < uint(len(s)) {
		// Unparsed tail left.
		return 0, fmt.Errorf("unparsed tail left after parsing int64 form %q: %q", s, s[i:])
	}
	if minus {
		d = -d
	}
	return d, nil
}

func ParseFloat(s string) (float64, error) {
	if len(s) == 0 {
		return 0, fmt.Errorf("cannot parse float64 from empty string")
	}
	slen := uint(len(s))
	i := uint(0)
	minus := s[0] == '-'
	if minus {
		i++
		if i >= slen {
			return 0, fmt.Errorf("cannot parse float64 from %q", s)
		}
	}

	d := uint64(0)
	j := i
	for i < slen {
		if s[i] >= '0' && s[i] <= '9' {
			d = d*10 + uint64(s[i]-'0')
			i++
			if i > 18 {
				// The integer part may be out of range for uint64.
				// Fall back to slow parsing.
				f, err := strconv.ParseFloat(s, 64)
				if err != nil && !math.IsInf(f, 0) {
					return 0, err
				}
				return f, nil
			}
			continue
		}
		break
	}
	if i <= j {
		ss := s[i:]
		if strings.HasPrefix(ss, "+") {
			ss = ss[1:]
		}
		if strings.EqualFold(ss, "inf") {
			if minus {
				return -inf, nil
			}
			return inf, nil
		}
		if strings.EqualFold(ss, "nan") {
			return nan, nil
		}
		return 0, fmt.Errorf("unparsed tail left after parsing float64 from %q: %q", s, ss)
	}
	f := float64(d)
	if i >= slen {
		// Fast path - just integer.
		if minus {
			f = -f
		}
		return f, nil
	}

	if s[i] == '.' {
		// Parse fractional part.
		i++
		if i >= slen {
			return 0, fmt.Errorf("cannot parse fractional part in %q", s)
		}
		k := i
		for i < slen {
			if s[i] >= '0' && s[i] <= '9' {
				d = d*10 + uint64(s[i]-'0')
				i++
				if i-j >= uint(len(float64pow10)) {
					// The mantissa is out of range. Fall back to standard parsing.
					f, err := strconv.ParseFloat(s, 64)
					if err != nil && !math.IsInf(f, 0) {
						return 0, fmt.Errorf("cannot parse mantissa in %q: %s", s, err)
					}
					return f, nil
				}
				continue
			}
			break
		}
		if i < k {
			return 0, fmt.Errorf("cannot find mantissa in %q", s)
		}
		// Convert the entire mantissa to a float at once to avoid rounding errors.
		f = float64(d) / float64pow10[i-k]
		if i >= slen {
			// Fast path - parsed fractional number.
			if minus {
				f = -f
			}
			return f, nil
		}
	}
	if s[i] == 'e' || s[i] == 'E' {
		// Parse exponent part.
		i++
		if i >= slen {
			return 0, fmt.Errorf("cannot parse exponent in %q", s)
		}
		expMinus := false
		if s[i] == '+' || s[i] == '-' {
			expMinus = s[i] == '-'
			i++
			if i >= slen {
				return 0, fmt.Errorf("cannot parse exponent in %q", s)
			}
		}
		exp := int16(0)
		j := i

		for i < slen {
			if s[i] >= '0' && s[i] <= '9' {
				exp = exp*10 + int16(s[i]-'0')
				i++
				if exp > 300 {
					// The exponent may be too big for float64.
					// Fall back to standard parsing.
					for k := i; k < slen; k++ {
						if s[k] < '0' || s[k] > '9' {
							return 0, fmt.Errorf("cannot parse float64 from %q", s)
						}
					}
					f, err := strconv.ParseFloat(s, 64)
					if err != nil && !math.IsInf(f, 0) {
						return 0, fmt.Errorf("cannot parse exponent in %q: %s", s, err)
					}
					return f, nil
				}
				continue
			}
			break
		}
		if i <= j {
			return 0, fmt.Errorf("cannot parse exponent in %q", s)
		}
		if expMinus {
			exp = -exp
		}
		f *= math.Pow10(int(exp))
		if i >= uint(len(s)) {
			if minus {
				f = -f
			}
			return f, nil
		}
	}
	return 0, fmt.Errorf("cannot parse float64 from %q", s)
}

//StrToUintDef From github.com/valyala/fastjson/tree/master/fastfloat
func StrToUintDef(vstr string, defv uint64) uint64 {
	vlen := uint(len(vstr))
	if vlen == 0 {
		return defv
	}
	if vlen > 18 {
		if dd, err := strconv.ParseUint(vstr, 10, 64); err != nil {
			return defv
		} else {
			return dd
		}
	}
	i := uint(0)
	d := uint64(0)
	j := i
	for i < vlen {
		if vstr[i] >= '0' && vstr[i] <= '9' {
			d = d*10 + uint64(vstr[i]-'0')
			i++
			continue
		}
		break
	}
	if i <= j || i < vlen {
		return defv
	}
	return d
}

var (
	inf = math.Inf(1)
	nan = math.NaN()
)

var float64pow10 = [...]float64{
	1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22, 1e123, 1e124,
}

//StrToFloatDef github.com/valyala/fastjson/tree/master/fastfloat
func StrToFloatDef(s string, defv float64) float64 {
	vlen := uint(len(s))
	if vlen == 0 {
		return defv
	}
	i := uint(0)
	minus := s[0] == '-'
	if minus {
		i++
		if i >= vlen {
			return defv
		}
	}

	d := uint64(0)
	j := i
	for i < vlen {
		if s[i] >= '0' && s[i] <= '9' {
			d = d*10 + uint64(s[i]-'0')
			i++
			if i > 18 {
				// The integer part may be out of range for uint64.
				// Fall back to slow parsing.
				f, err := strconv.ParseFloat(s, 64)
				if err != nil && !math.IsInf(f, 0) {
					return defv
				}
				return f
			}
			continue
		}
		break
	}
	if i <= j {
		ss := s[i:]
		if strings.HasPrefix(ss, "+") {
			ss = ss[1:]
		}
		if strings.EqualFold(ss, "inf") {
			if minus {
				return -inf
			}
			return inf
		}
		if strings.EqualFold(ss, "nan") {
			return nan
		}
		return defv
	}
	f := float64(d)
	if i >= uint(len(s)) {
		// Fast path - just integer.
		if minus {
			f = -f
		}
		return f
	}

	if s[i] == '.' {
		// Parse fractional part.
		i++
		if i >= uint(len(s)) {
			return defv
		}
		k := i
		for i < uint(len(s)) {
			if s[i] >= '0' && s[i] <= '9' {
				d = d*10 + uint64(s[i]-'0')
				i++
				if i-j >= uint(len(float64pow10)) {
					// The mantissa is out of range. Fall back to standard parsing.
					f, err := strconv.ParseFloat(s, 64)
					if err != nil && !math.IsInf(f, 0) {
						return defv
					}
					return f
				}
				continue
			}
			break
		}
		if i < k {
			return defv
		}
		// Convert the entire mantissa to a float at once to avoid rounding errors.
		f = float64(d) / float64pow10[i-k]
		if i >= uint(len(s)) {
			// Fast path - parsed fractional number.
			if minus {
				f = -f
			}
			return f
		}
	}
	if s[i] == 'e' || s[i] == 'E' {
		// Parse exponent part.
		i++
		if i >= uint(len(s)) {
			return defv
		}
		expMinus := false
		if s[i] == '+' || s[i] == '-' {
			expMinus = s[i] == '-'
			i++
			if i >= uint(len(s)) {
				return defv
			}
		}
		exp := int16(0)
		j := i
		for i < uint(len(s)) {
			if s[i] >= '0' && s[i] <= '9' {
				exp = exp*10 + int16(s[i]-'0')
				i++
				if exp > 300 {
					// The exponent may be too big for float64.
					// Fall back to standard parsing.
					f, err := strconv.ParseFloat(s, 64)
					if err != nil && !math.IsInf(f, 0) {
						return defv
					}
					return f
				}
				continue
			}
			break
		}
		if i <= j {
			return defv
		}
		if expMinus {
			exp = -exp
		}
		f *= math.Pow10(int(exp))
		if i >= uint(len(s)) {
			if minus {
				f = -f
			}
			return f
		}
	}
	return defv
}