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--[[ Lua rb settings reader
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2019 William Wilgus
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
]]
rb.settings = rb.settings or {}
local var = {offset = 1, size = 2, type = 3, fields = 3}
local function bytesLE_n(str)
str = str or ""
local tbyte={str:byte(1, -1)}
local bpos, num = 1, 0
for k = 1,#tbyte do -- (k = #t, 1, -1 for BE)
num = num + tbyte[k] * bpos
bpos = bpos * 256 --1<<8
end
return num
end
local function get_var_fields(s_var)
-- converts member string into table
-- var = {offset, size, "type"}
s_var = s_var or ""
local o, s, t = string.match(s_var, "(0x%x+),%s*(%d+),%s*(.+)")
local tvar = {o, s, t}
return #tvar == var.fields and tvar or nil
end
local function format_val(val, var_type)
local ret, num
if var_type == nil then
return nil
elseif var_type == "str" then
-- stop at first null byte, return nil if str doesn't exist
return val and string.match(val, "^%Z+") or nil
end
num = bytesLE_n(val)
if string.find(var_type, "^b") then
if(num <= 0) then
ret = false
else
ret = true
end
elseif string.find(var_type, "^u_[cil]") then
-- Lua integers are signed so we need to do a bit of extra processing
ret = (string.format("%u", num))
else
ret = num
end
return ret
end
local function dump_struct(t_settings, t_struct, n_elems, t_var)
--Internal function dumps structs
local tdata = {}
local function struct_get_elem(v, elem_offset)
local val, offset, tvar1
tvar1 = get_var_fields(v)
offset = t_var[var.offset] + tvar1[var.offset] + elem_offset
val = t_settings(offset, tvar1[var.size])
return format_val(val, tvar1[var.type])
end
if n_elems > 0 then
-- Array of structs, struct[elems];
local elemsize = (t_var[var.size] / n_elems)
for i = 0, n_elems - 1 do
tdata[i] = tdata[i] or {}
for k1, v1 in pairs(t_struct) do
tdata[i][k1] = struct_get_elem(v1, (elemsize * i))
end
end
else
-- single struct, struct;
for k1, v1 in pairs(t_struct) do
tdata[k1] = struct_get_elem(v1, 0)
end
end
return tdata
end
local function get_array_elems(var_type)
--extract the number of elements, returns 0 if not found
local elems = string.match(var_type,".*%[(%d+)%]")
return tonumber(elems) or 0
end
local function get_struct_name(var_type)
--extract the name of a struct, returns nil if not found
return string.match(var_type,"^s_([^%[%]%s]+)")
end
function rb.settings.read(s_settings, s_var, s_groupname)
local data, val
local tvar = get_var_fields(s_var)
if tvar == nil then return nil end
local elems = get_array_elems(tvar[var.type])
local structname = get_struct_name(tvar[var.type])
local tsettings = rb[s_settings]
if not tsettings then error(s_settings .. " does not exist") end
if structname and rb[s_groupname] then
return dump_struct(tsettings, rb[s_groupname][structname], elems, tvar)
end
local voffset, vsize, vtype = tvar[var.offset], tvar[var.size], tvar[var.type]
if elems > 0 then
-- Arrays of values, val[elems];
data = {}
local elemsize = (vsize / elems)
for i = 0, elems - 1 do
val = tsettings(voffset + (elemsize * i), elemsize)
data[i] = format_val(val, vtype)
end
else
-- Single value, val;
if vtype == "ptr_char" then -- (**char)
vtype = "str"
val = tsettings(voffset, vsize, nil, true)
else
val = tsettings(voffset, vsize)
end
data = format_val(val, vtype)
end
return data
end
function rb.settings.dump(s_settings, s_groupname, s_structname, t_output)
t_output = t_output or {}
local tgroup = rb[s_groupname]
s_structname = s_structname or s_settings
for k, v in pairs(tgroup[s_structname]) do
t_output[k] = rb.settings.read(s_settings, v, s_groupname)
end
return t_output
end
return true
|
