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96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
/**
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* \file libipc/platform/win/codecvt.h
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* \author mutouyun (orz@orzz.org)
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*/
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#pragma once
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#include <Windows.h>
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#include "libipc/imp/codecvt.h"
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#include "libipc/imp/detect_plat.h"
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namespace ipc {
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/**
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* \see https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar
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* https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-widechartomultibyte
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*
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* CP_ACP : The system default Windows ANSI code page.
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* CP_MACCP : The current system Macintosh code page.
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* CP_OEMCP : The current system OEM code page.
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* CP_SYMBOL : Symbol code page (42).
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* CP_THREAD_ACP: The Windows ANSI code page for the current thread.
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* CP_UTF7 : UTF-7. Use this value only when forced by a 7-bit transport mechanism. Use of UTF-8 is preferred.
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* CP_UTF8 : UTF-8.
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*/
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template <>
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std::size_t cvt_cstr(char const *src, std::size_t slen, wchar_t *des, std::size_t dlen) noexcept {
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if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
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// source string is empty
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return 0;
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}
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int cch_wc = (des == nullptr) ? 0 : (int)dlen;
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int size_needed = ::MultiByteToWideChar(CP_ACP, 0, src, (int)slen, des, cch_wc);
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if (size_needed <= 0) {
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// failed: MultiByteToWideChar(CP_ACP).
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return 0;
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}
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return size_needed;
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}
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template <>
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std::size_t cvt_cstr(wchar_t const *src, std::size_t slen, char *des, std::size_t dlen) noexcept {
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if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
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// source string is empty
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return 0;
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}
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int cb_mb = (des == nullptr) ? 0 : (int)dlen;
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int size_needed = ::WideCharToMultiByte(CP_ACP, 0, src, (int)slen, des, cb_mb, NULL, NULL);
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if (size_needed <= 0) {
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// failed: WideCharToMultiByte(CP_ACP).
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return 0;
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}
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return size_needed;
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}
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/**
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* \brief Used for char8_t (since C++20) to wchar_t conversion.
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*
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* There is no ut to guarantee correctness (I'm a little lazy here),
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* so if there are any bugs, please contact me in time.
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*/
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#if defined(LIBIMP_CPP_20)
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template <>
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std::size_t cvt_cstr(char8_t const *src, std::size_t slen, wchar_t *des, std::size_t dlen) noexcept {
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if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
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// source string is empty
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return 0;
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}
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int cch_wc = (des == nullptr) ? 0 : (int)dlen;
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int size_needed = ::MultiByteToWideChar(CP_UTF8, 0, (char *)src, (int)slen, des, cch_wc);
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if (size_needed <= 0) {
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// failed: MultiByteToWideChar(CP_UTF8).
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return 0;
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}
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return size_needed;
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}
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template <>
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std::size_t cvt_cstr(wchar_t const *src, std::size_t slen, char8_t *des, std::size_t dlen) noexcept {
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if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
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// source string is empty
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return 0;
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}
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int cb_mb = (des == nullptr) ? 0 : (int)dlen;
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int size_needed = ::WideCharToMultiByte(CP_UTF8, 0, src, (int)slen, (char *)des, cb_mb, NULL, NULL);
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if (size_needed <= 0) {
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// failed: WideCharToMultiByte(CP_UTF8).
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return 0;
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}
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return size_needed;
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}
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#endif // defined(LIBIMP_CPP_20)
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} // namespace ipc
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