tolua lua 添加 C库的byte[] 解析 byteArray ipack

 

为了方式封装和解析二进制数据 给tolua添加 ipack库 和一个lua的解析类 ByteArray

在lua中解析byte[]数据

ipcak https://github.com/LuaDist/lpack

参考 https://forum.cocos.com/t/bytearray/14319

1 从git上获得 ipack库

ipcak 库修改 

2 在tolua-runtime库 https://github.com/topameng/tolua_runtime

添加ipack 注册 找到tolua.c文件 tolua_openlibs方法 添加这个方法

3 生成对应平台的库文件 这个教程后期出 不过需要这个功能的人应该也是会的

4 添加LUA代码 

ipack =require 'ipack'
local setmetatable = setmetatable
local ByteArray =
{

}

ByteArray.__index = ByteArray
local typeEnum=
{
    OP_ZSTRING=	'z',--/* zero-terminated string */
    OP_BSTRING=	'p',--/* string preceded by length byte */
    OP_WSTRING=	'P',--/* string preceded by length word */
    OP_SSTRING=	'a',--/* string preceded by length size_t */
    OP_STRING=	'A',--/* string */
    OP_FLOAT=	'f',--/* float */
    OP_DOUBLE=	'd',--/* double */
    OP_NUMBER=	'n',--/* Lua number */
    OP_BYTE	=	'c',--/* char is byte*/
    OP_UBYTE =	'b',--/* byte = unsigned char */
    OP_SHORT	='h',--/* short */
    OP_USHORT=	'H',--/* unsigned short */
    OP_INT	=	'i',--/* int */
    OP_UINT	=	'I',--/* unsigned int */
    OP_LONG	=	'l',--/* long */
    OP_ULONG=	'L',--/* unsigned long */
    OP_LITTLEENDIAN=	'<',--/* little endian */
    OP_BIGENDIAN=	'>',--/* big endian */
    OP_NATIVE=	'=',--/* native endian */
}


--local	OP_ZSTRING=	'z'--/* zero-terminated string */
--local	OP_BSTRING=	'p'--/* string preceded by length byte */
--local	OP_WSTRING=	'P'--/* string preceded by length word */
--local	OP_SSTRING=	'a'--/* string preceded by length size_t */
--local	OP_STRING=	'A'--/* string */
--local	OP_FLOAT=	'f'--/* float */
--local	OP_DOUBLE=	'd'--/* double */
--local	OP_NUMBER=	'n'--/* Lua number */
--local	OP_CHAR	=	'c'--/* char */
--local	OP_BYTE	=	'b'--/* byte = unsigned char */
--local	OP_SHORT	='h'--/* short */
--local	OP_USHORT=	'H'--/* unsigned short */
--local	OP_INT	=	'i'--/* int */
--local	OP_UINT	=	'I'--/* unsigned int */
--local	OP_LONG	=	'l'--/* long */
--local	OP_ULONG=	'L'--/* unsigned long */
--local	OP_LITTLEENDIAN=	'<'--/* little endian */
--local	OP_BIGENDIAN=	'>'--/* big endian */
--local	OP_NATIVE=	'='--/* native endian */


--
--@packedStr --已经打包的字节字符串 如果是创建写bytearray 此参数不需要传nil
--@endian --字节序 不传默认小字节序
--]]
function ByteArray:new(packedStr, endian)
    local t = {}
    setmetatable(t, self)
    self.packedStr =packedStr
    self.endian = endian or '<'
    self.fmt = {}
    self.data = {}
    self.position = 1
    self.__index = self
    return t
end

--清除数据

--]]
function ByteArray:destroy()
    self.packedStr = nil
    self.fmt = nil
    self.data = nil
end

function ByteArray:readByte()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, typeEnum.OP_BYTE, self.position)
    return val
end

function ByteArray:writeByte(b)
    self.fmt[#self.fmt + 1] = typeEnum.OP_BYTE
    self.data[#self.data + 1] = b
end

function ByteArray:readUByte()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, typeEnum.OP_UBYTE, self.position)
    return val
end

function ByteArray:writeUByte(b)
    self.fmt[#self.fmt + 1] = typeEnum.OP_UBYTE
    self.data[#self.data + 1] = b
end


function ByteArray:readShort()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, self.endian .. typeEnum.OP_SHORT, self.position)
    return val
end
function ByteArray:readUshort()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, self.endian .. typeEnum.OP_USHORT, self.position)
    return val
end

function ByteArray:writeUShort(h)
    self.fmt[#self.fmt + 1] = typeEnum.OP_USHORT
    self.data[#self.data + 1] = h
end

function ByteArray:writeShort(h)
    self.fmt[#self.fmt + 1] = typeEnum.OP_SHORT
    self.data[#self.data + 1] = h
end

function ByteArray:readInt()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, self.endian .. typeEnum.OP_INT, self.position)
    return val
end

function ByteArray:writeInt(i)
    self.fmt[#self.fmt + 1] = typeEnum.OP_INT
    self.data[#self.data + 1] = i
end

function ByteArray:readDouble()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, self.endian .. typeEnum.OP_DOUBLE, self.position)
    return val
end

function ByteArray:readUint()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, self.endian .. typeEnum.OP_UINT, self.position)
    return val
end

function ByteArray:writeDouble(d)
    self.fmt[#self.fmt + 1] = typeEnum.OP_DOUBLE
    self.data[#self.data + 1] = d
end

function ByteArray:readString()
    local l = self:readShort()
    local val = 0
    self.position, val = ipack.unpack(self.packedStr, typeEnum.OP_STRING .. l, self.position)
    return val
end

function ByteArray:writeString(s)
    self:writeShort(#s)
    self.fmt[#self.fmt + 1] = typeEnum.OP_STRING
    self.data[#self.data + 1] = s
end

--获取打包后的 数据 -str

--]]
function ByteArray:getbytesString()
    if self.packedStr and self.packedStr ~= '' then
        return self.packedStr
    else
        print(self.endian .. table.concat(self.fmt))
        print(unpack(self.data))
        return ipack.pack(self.endian .. table.concat(self.fmt), unpack(self.data))
    end
end


return ByteArray

 使用方法 特别注意的是 大小端问题‘’<‘’ 如果解析失败 换下试试

如果解析数据是从C# 传过到lua的 记得要给数据加上标签[LuaByteBufferAttribute]  否则传过来是个table 

 local ByteArray=require"ipack/ByteArray"
        local ba = ByteArray:new(nil, '<')
        ba:writeInt(333300)
        ba:writeString('fuck 1334 goddess')
        ba:writeShort(44)
        ba:writeByte(-3)
        ba:writeByte(122)
        local s = ba:getbytesString()
        print(#s, s)
        print('----------------')
        local ba2 = ByteArray:new(s, '<')
        print(ba:readInt())
        print(ba:readString())
        print(ba:readShort())
        print(ba:readByte())
        print(ba:readByte())