Golang Imitation python pack/unpack

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Imperfect or perfect, especially high and low level conversion that (go and C binary higher status reverse need to convert, there is go int turn []byte length is 4 bit), hope the Bulls look after guidance

The project needs to be transferred through the socket client is go, the server side is Python, because of the need for packet unpacking, referring to Python written

Python's pack/unpack reference python uses struct to process binary (pack and unpack usage)

Package Includesimport ("bytes"    "encoding/binary"    "FMT"    _ "OS"    "StrConv"    "Strings") Type Protocolstruct{Format []string}//Sealing PackageFunc (P *protocol) Pack (args ...Interface{}) []byte{la:=len (args) LS:=Len (p.format) RET:= []byte{}    ifls >0&& La >0&& ls = =La { forI: =0; i < LS; i++ {            ifP.format[i] = ="H"{ret= Append (ret, IntToBytes2 (Args[i]. (int))...) } Else ifP.format[i] = ="I"{ret= Append (ret, INTTOBYTES4 (Args[i]. (int))...) } Else ifStrings. Contains (P.format[i],"s") {num, _:= StrConv. Atoi (Strings. TrimRight (P.format[i],"s")) RET= Append (ret, []byte(FMT. Sprintf ("%s%s", Args[i]. (string), strings. Repeat ("\x00", Num-len (Args[i]. (string)))))...) }        }    }    returnret}//UnpackingFunc (P *protocol) UnPack (msg []byte) []Interface{} {la:=Len (p.format) RET:= Make ([]Interface{}, LA)ifLa >0 {         forI: =0; I < LA; i++ {            ifP.format[i] = ="H"{Ret[i]= Bytes4toint (msg[0:2]) msg= msg[2: Len (msg)]} Else ifP.format[i] = ="I"{Ret[i]= Bytes4toint (msg[0:4]) msg= msg[4: Len (msg)]} Else ifStrings. Contains (P.format[i],"s") {num, _:= StrConv. Atoi (Strings. TrimRight (P.format[i],"s")) Ret[i]=string(msg[0: num]) Msg=Msg[num:len (msg)]}} }    returnRet}func (P*protocol) Size ()int{size:=0ls:=Len (P.format)ifls >0 {         forI: =0; i < LS; i++ {            ifP.format[i] = ="H"{size= size +2            } Else ifP.format[i] = ="I"{size= size +4            } Else ifStrings. Contains (P.format[i],"s") {num, _:= StrConv. Atoi (Strings. TrimRight (P.format[i],"s")) Size= size +num}} }    returnsize}//shaping into bytesFunc inttobytes (nint) []byte{m:=int32 (N) Bytesbuffer:= bytes. Newbuffer ([]byte{}) binary. Write (Bytesbuffer, Binary. Bigendian, M) GByte:=bytesbuffer.bytes ()returnGByte}//shaping into bytes 4 bitsFunc IntToBytes4 (nint) []byte{m:=int32 (N) Bytesbuffer:= bytes. Newbuffer ([]byte{}) binary. Write (Bytesbuffer, Binary. Bigendian, M) GByte:=bytesbuffer.bytes ()//C + + high-low conversionK: =4x:=Len (gbyte) NB:= Make ([]byte, K) forI: =0; I < K; i++{Nb[i]= gbyte[x-i-1]    }    returnNB}//shaping into bytes 2 bitsFunc IntToBytes2 (nint) []byte{m:=int32 (N) Bytesbuffer:= bytes. Newbuffer ([]byte{}) binary. Write (Bytesbuffer, Binary. Bigendian, M) GByte:=bytesbuffer.bytes ()//C + + high-low conversionK: =2x:=Len (gbyte) NB:= Make ([]byte, K) forI: =0; I < K; i++{Nb[i]= gbyte[x-i-1]    }    returnNB}//converting bytes into shapingFunc Bytestoint (b []byte)int{bytesbuffer:=bytes. Newbuffer (b)varx Int32 binary. Read (Bytesbuffer, Binary. Bigendian,&x)return int(x)}//4 bytes into shapingFunc Bytes4toint (b []byte)int{xx:= Make ([]byte,4)    ifLen (b) = =2{xx= []byte{b[0], b[1],0,0}    } Else{xx=B} m:=len (xx) NB:= Make ([]byte,4)     forI: =0; I <4; i++{Nb[i]= xx[m-i-1]} bytesbuffer:=bytes. Newbuffer (NB)varx Int32 binary. Read (Bytesbuffer, Binary. Bigendian,&x)return int(x)}

Call

P: =New(Protocol) P.format= []string{"H","H","I","16s","I","I","I"}h_byte:= P.pack (1,1,1,"ABC",1,0, Len (REQUEST_BUF)) Conn. Write (H_byte)

Additional:

intTurn binary FMT. Printf ("%08b\n", the)//01100001Binary ext int I, _:= StrConv. parseint ("1100001",2, +)// theintTurn []byteInttobytes ( +)//[0 0 3 232] 3*256+232=1000func inttobytes (nint) []byte{m:=int32 (N) Bytesbuffer:= bytes. Newbuffer ([]byte{}) binary. Write (Bytesbuffer, Binary. Bigendian, M) GByte:=bytesbuffer.bytes ()returnGByte} []byteturn int Bytestoint ([]byte{0,0,3,232})// +func bytestoint (b []byte)int{bytesbuffer:=bytes. Newbuffer (b)varx int32binary. Read (Bytesbuffer, Binary. Bigendian,&x)return int(x)}intTurnbyte byte( the)// the