forked from len0rd/rockbox
adff45ca21
fix a few bugs, improve memory usage Change-Id: I6ceefd033000a6178eab0dd513679b5d72cec81c
107 lines
3.6 KiB
Lua
107 lines
3.6 KiB
Lua
--[[
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 William Wilgus
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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]]
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--create keyboard layout
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--BILGUS 4/2021
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-- create_kbd_layout = require("create_kbd_layout")
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-- local layout = create_kbd_layout("abcd")
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local function encode_short(n)
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return string.char(bit.band(0x00FF, n), bit.rshift(bit.band(0xFF00, n), 8))
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end
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local function utf8decode(str)
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local INVALID = 0xfffd
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local t = {}
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local function check_char(c)
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local tail = false
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local code
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c = string.byte(c)
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if (c <= 0x7f) or (c >= 0xc2) then
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-- Start of new character
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if (c < 0x80) then -- U-00000000 - U-0000007F, 1 string.byte
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code = c;
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elseif (c < 0xe0) then -- U-00000080 - U-000007FF, 2 string.bytes
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tail = 1;
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code = bit.band(c, 0x1f)
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elseif (c < 0xf0) then -- U-00000800 - U-0000FFFF, 3 string.bytes
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tail = 2;
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code = bit.band(c, 0x0f)
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elseif (c < 0xf5) then -- U-00010000 - U-001FFFFF, 4 string.bytes
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tail = 3;
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code = bit.band(c, 0x07)
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else
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-- Invalid size
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code = INVALID;
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end
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while tail and c ~= 0 do
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tail = tail - 1
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if bit.band(c, 0xc0) == 0x80 then
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-- Valid continuation character
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code = bit.bor(bit.lshift(code, 6),bit.band(c, 0x3f))
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else
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-- Invalid continuation char
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code = INVALID;
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break;
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end
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end
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else
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-- Invalid UTF-8 char
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code = INVALID;
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end
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-- currently we don't support chars above U-FFFF
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t[#t + 1 ] = encode_short((code < 0x10000) and code or INVALID)
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end
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str:gsub(".", check_char) -- run check function for every char
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return table.concat(t)
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end
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local function create_keyboard_layout(s_layout)
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local insert = table.insert
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lines = {}
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for str in string.gmatch(s_layout, "([^\n]+)") do
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local len = string.len(str)
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lines[#lines + 1] =
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table.concat({encode_short(len), utf8decode(str)})
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end
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lines[#lines + 1] = encode_short(0xFEFF)
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return table.concat(lines)
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end
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--[[
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local name = "Test_KBD_LAYOUT_" .. tostring(1)
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local test = create_keyboard_layout("ABCDEFGHIJKLM\nNOPQRSTUVWXYZ\n0123456789")
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local file = io.open('/' .. name, "w+") -- overwrite, rb ignores the 'b' flag
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file:write(test)-- write the layout to the file now
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file:close()
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if not file then
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rb.splash(rb.HZ, "Error opening /" .. name)
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return
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end
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rb.kbd_input(name, test)
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]]
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return create_keyboard_layout
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