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add: [codecvt] character set encoding conversion interface

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mutouyun 2022-08-07 22:29:11 +08:00
parent 56ee0e12df
commit ce52a1176c
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26
include/libimp/codecvt.h Normal file
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/**
* @file libimp/codecvt.h
* @author mutouyun (orz@orzz.org)
* @brief Character set conversion interface
* @date 2022-08-07
*/
#pragma once
#include <string>
#include <cstddef>
#include "libimp/def.h"
#include "libimp/export.h"
LIBIMP_NAMESPACE_BEG_
/**
* @brief The transform between local-character-set(UTF-8/GBK/...) and UTF-16/32
*
* @param des The target string pointer can be nullptr
* @param dlen The target string length can be 0
*/
template <typename CharT, typename CharU>
LIBIMP_EXPORT std::size_t cvt_cstr(CharT const *src, std::size_t slen, CharU *des, std::size_t dlen) noexcept;
LIBIMP_NAMESPACE_END_

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src/libimp/codecvt.cpp Normal file
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#include "libimp/detect_plat.h"
#if defined(LIBIMP_OS_WIN)
#include "libimp/platform/win/codecvt.h"
#else
#include "libimp/platform/posix/codecvt.h"
#endif

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src/libimp/platform/posix/codecvt.h Normal file
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/**
* @file libimp/platform/win/codecvt.h
* @author mutouyun (orz@orzz.org)
*/
#pragma once
#include <cstdint>
#include <type_traits>
#include "libimp/codecvt.h"
#include "libimp/log.h"
LIBIMP_NAMESPACE_BEG_
/**
* @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)
*/
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> {
LIBIMP_LOG_();
if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
log.error("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> {
LIBIMP_LOG_();
if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
log.error("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> {
LIBIMP_LOG_();
if ((src == nullptr) || ((*src) == 0) || (slen == 0)) {
log.error("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;
}
} // namespace
template <>
std::size_t cvt_cstr(char const *src, std::size_t slen, wchar_t *des, std::size_t dlen) noexcept {
return cvt_cstr_utf(src, slen, des, dlen);
}
template <>
std::size_t cvt_cstr(wchar_t const *src, std::size_t slen, char *des, std::size_t dlen) noexcept {
return cvt_cstr_utf(src, slen, des, dlen);
}
LIBIMP_NAMESPACE_END_

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src/libimp/platform/win/codecvt.h Normal file
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/**
* @file libimp/platform/win/codecvt.h
* @author mutouyun (orz@orzz.org)
*/
#pragma once
#include <Windows.h>
#include "libimp/codecvt.h"
#include "libimp/log.h"
LIBIMP_NAMESPACE_BEG_
/**
* @brief The transform between local-character-set(UTF-8/GBK/...) and UTF-16/32
*
* https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar
* https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-widechartomultibyte
*
* CP_ACP : The system default Windows ANSI code page.
* CP_MACCP : The current system Macintosh code page.
* CP_OEMCP : The current system OEM code page.
* CP_SYMBOL : Symbol code page (42).
* CP_THREAD_ACP: The Windows ANSI code page for the current thread.
* CP_UTF7 : UTF-7. Use this value only when forced by a 7-bit transport mechanism. Use of UTF-8 is preferred.
* CP_UTF8 : UTF-8.
*/
template <>
std::size_t cvt_cstr(char const *src, std::size_t slen, wchar_t *des, std::size_t dlen) noexcept {
LIBIMP_LOG_();
int r = ::MultiByteToWideChar(CP_UTF8, 0, src, (int)slen, des, (int)dlen);
if (r <= 0) {
log.error("MultiByteToWideChar fails. return = {}", ::GetLastError());
return 0;
}
return (std::size_t)r;
}
template <>
std::size_t cvt_cstr(wchar_t const *src, std::size_t slen, char *des, std::size_t dlen) noexcept {
LIBIMP_LOG_();
int r = ::WideCharToMultiByte(CP_UTF8, 0, src, (int)slen, des, (int)dlen, nullptr, nullptr);
if (r <= 0) {
log.error("WideCharToMultiByte fails. return = {}", ::GetLastError());
return 0;
}
return (std::size_t)r;
}
LIBIMP_NAMESPACE_END_

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test/test_imp_codecvt.cpp Normal file
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#include <string>
#include <cstring>
#include "gtest/gtest.h"
#include "libimp/codecvt.h"
TEST(codecvt, cvt_cstr) {
char const *utf8 = "hello world, "
"\xe4\xbd\xa0\xe5\xa5\xbd\xef\xbc"
"\x8c\xe3\x81\x93\xe3\x82\x93\xe3"
"\x81\xab\xe3\x81\xa1\xe3\x81\xaf";
wchar_t const *utf16 = L"hello world, \u4f60\u597d\uff0c\u3053\u3093\u306b\u3061\u306f";
{
auto cvt_len = imp::cvt_cstr(utf8, std::strlen(utf8), (wchar_t *)nullptr, 0);
EXPECT_NE(cvt_len, 0);
std::wstring wstr(cvt_len, L'\0');
EXPECT_EQ(imp::cvt_cstr(utf8, std::strlen(utf8), &wstr[0], wstr.size()), cvt_len);
EXPECT_STREQ(wstr.c_str(), utf16);
}
{
auto cvt_len = imp::cvt_cstr(utf16, std::wcslen(utf16), (char *)nullptr, 0);
EXPECT_NE(cvt_len, 0);
std::string str(cvt_len, L'\0');
EXPECT_EQ(imp::cvt_cstr(utf16, std::wcslen(utf16), &str[0], str.size()), cvt_len);
EXPECT_STREQ(str.c_str(), utf8);
}
}