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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 ffi = require("ffi")
ffi.cdef[[
int __stdcall MultiByteToWideChar(unsigned int cp, uint32_t flag, const char* src, int srclen, wchar_t* dst, int dstlen);
int __stdcall WideCharToMultiByte(unsigned int cp, uint32_t flag, const char* src, int srclen, char* dst, int dstlen, const char* defchar, int* used);
uint32_t __stdcall GetLastError(void);
]]
local C = ffi.C
local achar_t = ffi.typeof'char[?]'
local awchar_t = ffi.typeof'wchar_t[?]'
local pchar_t = ffi.typeof'char*'
local pwchar_t = ffi.typeof'wchar_t*'
-- The data area passed to a system call is too small.
local ERROR_INSUFFICIENT_BUFFER = 122; -- 0x0000007A
local function strnlen(data, n)
if type(data) == 'string' then
return #data
end
if not n then
if ffi.istype(pchar_t, data) then
n = math.huge
else -- assume char[?] / char&[...]
n = assert(ffi.sizeof(data))
end
end
for i = 0, n-1 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
if not n then
if ffi.istype(pchar_t, data) then
n = math.huge
else -- assume wchar[?] / wchar&[...]
n = math.ceil(assert(ffi.sizeof(data))/2)
end
end
for i = 0, n-1 do
if data[i] == 0 then return i end
end
return n
end
local function MultiByteToWideChar(src, cp)
if not src or #src == 0 then return src, 0 end
local flag = true
local buflen = strnlen(src)
local dst = ffi.new(awchar_t, buflen + 1) -- eos
local ret = C.MultiByteToWideChar(cp, 0, src, #src, dst, buflen)
if ret < 0 then return nil, C.GetLastError() end
if ret <= buflen then
dst[ret] = 0
return dst, ret
end
dst = ffi.new(awchar_t, 1)
dst[0] = 0
return dst,0
end
local function WideCharToMultiByte(src, cp)
local srclen = wcsnlen(src)
local buflen = srclen + 1
if type(src) == 'userdata' then src = ffi.cast('const char*', src) end
while true do
local dst = ffi.new("char[?]", buflen + 1) -- eof
local ret = ffi.C.WideCharToMultiByte(cp, 0, src, srclen, dst, buflen, nil, nil)
if ret <= 0 then
local err = C.GetLastError()
if err == ERROR_INSUFFICIENT_BUFFER then
buflen = math.ceil(1.5 * buflen)
else
return nil, err
end
else
if ret <= buflen then
return dst, ret
end
end
end
local dst = ffi.new(achar_t, 1)
dst[0] = 0
return dst,0
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 ffi.string(dst, dstlen)
end
local const_pchar_t = ffi.typeof'char*'
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 ffi.string(ffi.cast(const_pchar_t, dst), dstlen*2)
end
local _M = {
MultiByteToWideChar = MultiByteToWideChar;
WideCharToMultiByte = WideCharToMultiByte;
mbstowcs = LUA_M2W;
wcstombs = LUA_W2M;
}
return _M
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