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cpp-ipc/src/libipc/imp/codecvt.cpp
mutouyun e717ad46fb Add codecvt
2025-12-03 08:08:03 +00:00

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#include <algorithm>
#include <type_traits>
#include <cstring>
#include <cstdint>
#include "libipc/imp/codecvt.h"
#include "libipc/imp/detect_plat.h"
#if defined(LIBIPC_OS_WIN)
# include "libipc/platform/win/codecvt.h"
#endif
namespace ipc {
/**
* \brief The transform between local-character-set(UTF-8/GBK/...) and UTF-16/32.
*
* Modified from UnicodeConverter.
* Copyright (c) 2010. Jianhui Qin (http://blog.csdn.net/jhqin).
*
* \remarks codecvt_utf8_utf16/std::wstring_convert is deprecated.
* \see https://codingtidbit.com/2020/02/09/c17-codecvt_utf8-is-deprecated/
* https://stackoverflow.com/questions/42946335/deprecated-header-codecvt-replacement
* https://en.cppreference.com/w/cpp/locale/codecvt/in
*/
namespace {
/// \brief X-bit unicode transformation format
enum class ufmt {
utf8,
utf16,
utf32,
};
template <typename T, ufmt, typename = void>
struct utf_compatible : std::false_type {};
template <typename T>
struct utf_compatible<T, ufmt::utf8,
std::enable_if_t<std::is_fundamental<T>::value && (sizeof(T) == 1)>> : std::true_type {};
template <typename T>
struct utf_compatible<T, ufmt::utf16,
std::enable_if_t<std::is_fundamental<T>::value && (sizeof(T) == 2)>> : std::true_type {};
template <typename T>
struct utf_compatible<T, ufmt::utf32,
std::enable_if_t<std::is_fundamental<T>::value && (sizeof(T) == 4)>> : std::true_type {};
template <typename T, ufmt Fmt>
constexpr bool utf_compatible_v = utf_compatible<T, Fmt>::value;
/**
* \brief UTF-32 --> UTF-8
*/
template <typename T, typename U>
auto cvt_char(T src, U* des, std::size_t dlen) noexcept
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf32> &&
utf_compatible_v<U, ufmt::utf8>, std::size_t> {
if (src == 0) return 0;
constexpr std::uint8_t prefix[] = {
0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC
};
constexpr std::uint32_t codeup[] = {
0x80, // U+00000000 - U+0000007F
0x800, // U+00000080 - U+000007FF
0x10000, // U+00000800 - U+0000FFFF
0x200000, // U+00010000 - U+001FFFFF
0x4000000, // U+00200000 - U+03FFFFFF
0x80000000 // U+04000000 - U+7FFFFFFF
};
std::size_t i, len = sizeof(codeup) / sizeof(std::uint32_t);
for(i = 0; i < len; ++i) {
if (static_cast<std::uint32_t>(src) < codeup[i]) break;
}
if (i == len) return 0; // the src is invalid
len = i + 1;
if (des != nullptr) {
if (dlen > i) for (; i > 0; --i) {
des[i] = static_cast<U>((src & 0x3F) | 0x80);
src >>= 6;
}
des[0] = static_cast<U>(src | prefix[len - 1]);
}
return len;
}
/**
* \brief UTF-8 --> UTF-32
*/
template <typename T, typename U>
auto cvt_char(T const *src, std::size_t slen, U &des) noexcept
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf8> &&
utf_compatible_v<U, ufmt::utf32>, std::size_t> {
if ((src == nullptr) || (*src) == 0) return 0;
if (slen == 0) return 0;
std::uint8_t b = (std::uint8_t)*(src++);
if (b < 0x80) {
des = b;
return 1;
}
if (b < 0xC0 || b > 0xFD) return 0; // the src is invalid
std::size_t len;
if (b < 0xE0) {
des = b & 0x1F;
len = 2;
} else if (b < 0xF0) {
des = b & 0x0F;
len = 3;
} else if (b < 0xF8) {
des = b & 0x07;
len = 4;
} else if (b < 0xFC) {
des = b & 0x03;
len = 5;
} else {
des = b & 0x01;
len = 6;
}
if (slen < len) return 0;
std::size_t i = 1;
for(; i < len; ++i) {
b = *(src++);
if ((b < 0x80) || (b > 0xBF)) return 0; // the src is invalid
des = (des << 6) + (b & 0x3F);
}
return len;
}
/**
* \brief UTF-32 --> UTF-16
*/
template <typename T, typename U>
auto cvt_char(T src, U *des, std::size_t dlen) noexcept
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf32> &&
utf_compatible_v<U, ufmt::utf16>, std::size_t> {
if (src == 0) return 0;
if (src <= 0xFFFF) {
if ((des != nullptr) && (dlen != 0)) {
(*des) = static_cast<U>(src);
}
return 1;
} else if (src <= 0xEFFFF) {
if ((des != nullptr) && (dlen > 1)) {
des[0] = static_cast<U>(0xD800 + (src >> 10) - 0x40); // high
des[1] = static_cast<U>(0xDC00 + (src & 0x03FF)); // low
}
return 2;
}
return 0;
}
/**
* \brief UTF-16 --> UTF-32
*/
template <typename T, typename U>
auto cvt_char(T const *src, std::size_t slen, U &des)
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf16> &&
utf_compatible_v<U, ufmt::utf32>, std::size_t> {
if ((src == nullptr) || (*src) == 0) return 0;
if (slen == 0) return 0;
std::uint16_t w1 = src[0];
if ((w1 >= 0xD800) && (w1 <= 0xDFFF)) {
if (w1 < 0xDC00) {
if (slen < 2) return 0;
std::uint16_t w2 = src[1];
if ((w2 >= 0xDC00) && (w2 <= 0xDFFF)) {
des = (w2 & 0x03FF) + (((w1 & 0x03FF) + 0x40) << 10);
return 2;
}
}
return 0; // the src is invalid
}
des = w1;
return 1;
}
/**
* \brief UTF-16 --> UTF-8
*/
template <typename T, typename U>
auto cvt_char(T src, U *des, std::size_t dlen) noexcept
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf16> &&
utf_compatible_v<U, ufmt::utf8>, std::size_t> {
// make utf-16 to utf-32
std::uint32_t tmp;
if (cvt_char(&src, 1, tmp) != 1) return 0;
// make utf-32 to utf-8
return cvt_char(tmp, des, dlen);
}
/**
* \brief UTF-8 --> UTF-16
*/
template <typename T, typename U>
auto cvt_char(T const *src, std::size_t slen, U &des)
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf8> &&
utf_compatible_v<U, ufmt::utf16>, std::size_t> {
// make utf-8 to utf-32
std::uint32_t tmp;
std::size_t len = cvt_char(src, slen, tmp);
if (len == 0) return 0;
// make utf-32 to utf-16
if (cvt_char(tmp, &des, 1) != 1) return 0;
return len;
}
/**
* \brief UTF-32 string --> UTF-8/16 string
*/
template <typename T, typename U>
auto cvt_cstr_utf(T const *src, std::size_t slen, U *des, std::size_t dlen) noexcept
-> std::enable_if_t<utf_compatible_v<T, ufmt::utf32> &&
(utf_compatible_v<U, ufmt::utf16> || utf_compatible_v<U, ufmt::utf8>), std::size_t> {
if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
// source string is empty
return 0;
}
std::size_t num = 0, len = 0;
for (std::size_t i = 0; (i < slen) && ((*src) != 0); ++src, ++i) {
len = cvt_char(*src, des, dlen);
if (len == 0) return 0;
if (des != nullptr) {
des += len;
if (dlen < len) {
dlen = 0;
} else {
dlen -= len;
}
}
num += len;
}
return num;
}
/**
* \brief UTF-8/16 string --> UTF-32 string
*/
template <typename T, typename U>
auto cvt_cstr_utf(T const *src, std::size_t slen, U *des, std::size_t dlen) noexcept
-> std::enable_if_t<utf_compatible_v<U, ufmt::utf32> &&
(utf_compatible_v<T, ufmt::utf16> || utf_compatible_v<T, ufmt::utf8>), std::size_t> {
if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
// source string is empty
return 0;
}
std::size_t num = 0;
for (std::size_t i = 0; (i < slen) && ((*src) != 0);) {
std::uint32_t tmp;
std::size_t len = cvt_char(src, slen - i, tmp);
if (len == 0) return 0;
if ((des != nullptr) && (dlen > 0)) {
(*des) = tmp;
++des;
dlen -= 1;
}
src += len;
i += len;
num += 1;
}
return num;
}
/**
* \brief UTF-8/16 string --> UTF-16/8 string
*/
template <typename T, typename U>
auto cvt_cstr_utf(T const *src, std::size_t slen, U *des, std::size_t dlen) noexcept
-> std::enable_if_t<(utf_compatible_v<T, ufmt::utf8> && utf_compatible_v<U, ufmt::utf16>) ||
(utf_compatible_v<T, ufmt::utf16> && utf_compatible_v<U, ufmt::utf8>), std::size_t> {
if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
// source string is empty
return 0;
}
std::size_t num = 0;
for (std::size_t i = 0; (i < slen) && ((*src) != 0);) {
// make utf-x to utf-32
std::uint32_t tmp;
std::size_t len = cvt_char(src, slen - i, tmp);
if (len == 0) return 0;
src += len;
i += len;
// make utf-32 to utf-y
len = cvt_char(tmp, des, dlen);
if (len == 0) return 0;
if (des != nullptr) {
des += len;
if (dlen < len) {
dlen = 0;
} else {
dlen -= len;
}
}
num += len;
}
return num;
}
template <typename T, typename U>
auto cvt_cstr_utf(T const *src, std::size_t slen, U *des, std::size_t dlen) noexcept
-> std::enable_if_t<(sizeof(T) == sizeof(U)), std::size_t> {
if ((des == nullptr) || (dlen == 0)) {
return slen;
}
std::size_t r = (std::min)(slen, dlen);
std::memcpy(des, src, r * sizeof(T));
return r;
}
} // namespace
#define LIBIPC_DEF_CVT_CSTR_($CHAR_T, $CHAR_U) \
template <> \
std::size_t cvt_cstr($CHAR_T const *src, std::size_t slen, $CHAR_U *des, std::size_t dlen) noexcept { \
return cvt_cstr_utf(src, slen, des, dlen); \
}
// #define LIBIPC_DEF_CVT_CSTR_($CHAR_T, $CHAR_U)
LIBIPC_DEF_CVT_CSTR_(char , char)
LIBIPC_DEF_CVT_CSTR_(char , char16_t)
LIBIPC_DEF_CVT_CSTR_(char , char32_t)
LIBIPC_DEF_CVT_CSTR_(wchar_t , wchar_t)
LIBIPC_DEF_CVT_CSTR_(char16_t, char16_t)
LIBIPC_DEF_CVT_CSTR_(char16_t, char)
LIBIPC_DEF_CVT_CSTR_(char16_t, char32_t)
LIBIPC_DEF_CVT_CSTR_(char32_t, char32_t)
LIBIPC_DEF_CVT_CSTR_(char32_t, char)
LIBIPC_DEF_CVT_CSTR_(char32_t, char16_t)
#if !defined(LIBIPC_OS_WIN)
LIBIPC_DEF_CVT_CSTR_(char , wchar_t)
LIBIPC_DEF_CVT_CSTR_(wchar_t , char)
LIBIPC_DEF_CVT_CSTR_(wchar_t , char16_t)
LIBIPC_DEF_CVT_CSTR_(wchar_t , char32_t)
LIBIPC_DEF_CVT_CSTR_(char16_t, wchar_t)
LIBIPC_DEF_CVT_CSTR_(char32_t, wchar_t)
#endif // !defined(LIBIPC_OS_WIN)
#if defined(LIBIPC_CPP_20)
LIBIPC_DEF_CVT_CSTR_(char8_t , char8_t)
LIBIPC_DEF_CVT_CSTR_(char8_t , char)
LIBIPC_DEF_CVT_CSTR_(char8_t , char16_t)
LIBIPC_DEF_CVT_CSTR_(char8_t , char32_t)
LIBIPC_DEF_CVT_CSTR_(char , char8_t)
LIBIPC_DEF_CVT_CSTR_(char16_t, char8_t)
LIBIPC_DEF_CVT_CSTR_(char32_t, char8_t)
#if !defined(LIBIPC_OS_WIN)
LIBIPC_DEF_CVT_CSTR_(char8_t , wchar_t)
LIBIPC_DEF_CVT_CSTR_(wchar_t , char8_t)
#endif // !defined(LIBIPC_OS_WIN)
#endif // defined(LIBIPC_CPP_20)
#undef LIBIPC_DEF_CVT_CSTR_
} // namespace ipc
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