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GTASA / moonloader /lib /path /win32 /alien /wcs.lua
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------------------------------------------------------------------
--
-- Author: Alexey Melnichuk <alexeymelnichuck@gmail.com>
--
-- Copyright (C) 2013-2016 Alexey Melnichuk <alexeymelnichuck@gmail.com>
--
-- Licensed according to the included 'LICENCE' document
--
-- This file is part of lua-path library.
--
------------------------------------------------------------------
local alien = require "alien"
local kernel32 = assert(alien.load("kernel32.dll"))
local MultiByteToWideChar_ = assert(kernel32.MultiByteToWideChar)
local WideCharToMultiByte_ = assert(kernel32.WideCharToMultiByte)
local GetLastError = assert(kernel32.GetLastError)
local DWORD = "uint"
local WCHAR_SIZE = 2
-- int __stdcall MultiByteToWideChar(UINT cp, DWORD flag, const char* src, int srclen, wchar_t* dst, int dstlen);
MultiByteToWideChar_:types{abi="stdcall", ret = "int",
"uint", -- cp
DWORD, -- flag
"string", -- src (const char*)
"int", -- srclen
"string", -- dst (wchar_t*)
"int" -- dstlen
}
--int __stdcall WideCharToMultiByte(UINT cp, DWORD flag, const wchar_t* src, int srclen, char* dst, int dstlen, const char* defchar, int* used);
WideCharToMultiByte_:types{abi="stdcall", ret = "int",
"int", -- cp
DWORD, -- flag
"string", -- src (const wchar_t*)
"int", -- srclen
"string", -- dst (char*)
"int", -- dstlen
"pointer", -- defchar (char*)
"pointer" -- used(int*)
}
GetLastError:types{ret = DWORD, abi='stdcall'}
local function strnlen(data, n)
if type(data) == 'string' then
return #data
end
n = n or #data
for i = 1, n do
if data[i] == 0 then
return i
end
end
return n
end
local function wcsnlen(data, n)
if type(data) == 'string' then
return math.ceil(#data/2)
end
n = n or #data
for i = 1, (2 * n), 2 do
if (data[i] == 0) and (data[i+1] == 0) then
return math.floor( i / 2 )
end
end
return n
end
local function MultiByteToWideChar(src, cp)
local flag = true
local buflen = strnlen(src)
local dst = alien.buffer( WCHAR_SIZE * (buflen + 1) ) -- eos
local ret = MultiByteToWideChar_(cp, 0, src, #src, dst, buflen)
if ret < 0 then return nil, GetLastError() end
if ret <= buflen then
dst[ret * WCHAR_SIZE ] = 0
dst[ret * WCHAR_SIZE + 1] = 0
return dst, ret
end
dst = alien.buffer(WCHAR_SIZE * 1)
dst[0] = 0
dst[1] = 0
return dst,0
end
local function WideCharToMultiByte(src, cp)
local srclen = wcsnlen(src)
local buflen = (srclen + 1)
while true do
local dst = alien.buffer(buflen + 1) -- eof
local ret = WideCharToMultiByte_(cp, 0, src, srclen, dst, buflen, nil, nil)
if ret <= 0 then
local err = GetLastError()
if err == 122 then -- buffer too small
buflen = math.ceil(1.5 * buflen)
else
return nil, err
end
else
if ret <= buflen then
return dst, ret
end
end
end
local dst = alien.buffer(1)
dst[0] = 0
return dst, 0
end
local function LUA_M2W(src, ...)
if not src or #src == 0 then return src end
local dst, dstlen = MultiByteToWideChar(src, ...)
if not dst then return nil, dstlen end
return dst:tostring(dstlen * WCHAR_SIZE)
end
local function LUA_W2M(src, ...)
if not src or #src == 0 then return src end
local dst, dstlen = WideCharToMultiByte(src, ...)
if not dst then return nil, dstlen end
return dst:tostring(dstlen)
end
local _M = {
MultiByteToWideChar = MultiByteToWideChar;
WideCharToMultiByte = WideCharToMultiByte;
mbstowcs = LUA_M2W;
wcstombs = LUA_W2M;
}
return _M