Lua-根据字节和位信息生成字节流

1.代码

-- 定义参数配置表
local params_config = {
    -- 字节偏移  位偏移  位数
    a = {byte_offset = 0, bit_offset = 0, length = 32},     -- 预留
    b = {byte_offset = 4, bit_offset = 0, length = 3},      -- 预留
    c = {byte_offset = 4, bit_offset = 3, length = 5}       -- 预留
}

-- 遍历params_config中的所有参数
for paramName, paramConfig in pairs(params_config) do
    paramConfig.byte_offset = paramConfig.byte_offset + 1   -- 增加1以适配lua的下标从1开始
    print("初始化参数:", paramName)
end

-- 设置参数的函数
local function set_param(streamData, param_name, value)
    local param = params_config[param_name]

    if not param then
        print("未知参数,设置失败!")
        return nil, "Parameter not found"
    end
    local start_byte = param.byte_offset
    local start_bit = param.bit_offset
    local bit_length = param.length
    print("当前参数信息-字节偏移 位偏移 字节长度:", start_byte, start_bit, bit_length)

    -- 检查想要设置的值是否在允许的范围内
    if value < 0 or value >= (1 << bit_length) then
        print("参数设置值溢出,设置失败!")
        return nil, "Value out of range"
    end

    -- 将想要设置的值设置到临时字节流中
    local tempValue = value
    tempValue = value << start_bit                        -- 左移以适配参数的位起始位置  

    local tempParamTab = {0x00, 0x00, 0x00, 0x00}     -- 处理的是32位整数
    for i = 1, #tempParamTab do
        local byte = (tempValue >> ((i - 1) * 8)) & 0xFF  -- 取出每个字节
        tempParamTab[i] = byte
    end

    local tempString = ""
    for i = 1, #tempParamTab do
        tempString = tempString .. string.format("%02X ", tempParamTab[i])
    end
    -- print(string.format("%02X", value), string.format("%02X", tempValue), tempString)

    -- 将临时字节流中的字节依次设置到最终的字节流中
    for i = start_byte, start_byte+#tempParamTab-1 do
        streamData[i] = streamData[i] | tempParamTab[i-start_byte+1]
    end


    return true
end


-- 创建字节流
local streamData = {} -- 创建一个表来表示字节数据
for i = 1, 10 do
    streamData[i] = 0 -- 初始化每个字节为0
end

-- 测试
set_param(streamData, "a", 65535)
local hexString = ""
for i = 1, #streamData do
    hexString = hexString .. string.format("%02X ", streamData[i])
end
print("输出的字节流:", hexString) -- 输出: 1234AB CD...


set_param(streamData, "b", 7)
hexString = ""
for i = 1, #streamData do
    hexString = hexString .. string.format("%02X ", streamData[i])
end
print("输出的字节流:", hexString) -- 输出: 1234AB CD...


set_param(streamData, "c", 31)

hexString = ""
for i = 1, #streamData do
    hexString = hexString .. string.format("%02X ", streamData[i])
end
print("输出的字节流:", hexString) -- 输出: 1234AB CD...