mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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154 lines
6.5 KiB
C++
154 lines
6.5 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <vapours.hpp>
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namespace ams::util {
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namespace {
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constexpr inline int8_t Utf8NBytesInnerTable[0x100 + 1] = {
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-1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8,
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};
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constexpr inline const char * const Utf8NBytesTable = static_cast<const char *>(static_cast<const void *>(Utf8NBytesInnerTable + 1));
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}
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CharacterEncodingResult ConvertCharacterUtf8ToUtf32(u32 *dst, const char *src) {
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/* Check pre-conditions. */
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AMS_ASSERT(dst != nullptr);
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AMS_ASSERT(src != nullptr);
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/* Perform the conversion. */
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const unsigned char *p = reinterpret_cast<const unsigned char *>(src);
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switch (Utf8NBytesTable[p[0]]) {
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case 1:
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*dst = static_cast<u32>(p[0]);
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return CharacterEncodingResult_Success;
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case 2:
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if ((p[0] & 0x1E) != 0) {
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if (Utf8NBytesTable[p[1]] == 0) {
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*dst = (static_cast<uint32_t>(p[0] & 0x1F) << 6) | (static_cast<uint32_t>(p[1] & 0x3F) << 0);
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return CharacterEncodingResult_Success;
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}
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}
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break;
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case 3:
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if (Utf8NBytesTable[p[1]] == 0 && Utf8NBytesTable[p[2]] == 0) {
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const u32 c = (static_cast<uint32_t>(p[0] & 0xF) << 12) | (static_cast<uint32_t>(p[1] & 0x3F) << 6) | (static_cast<uint32_t>(p[2] & 0x3F) << 0);
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if ((c & 0xF800) != 0 && (c & 0xF800) != 0xD800) {
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*dst = c;
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return CharacterEncodingResult_Success;
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}
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}
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return CharacterEncodingResult_InvalidFormat;
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case 4:
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if (Utf8NBytesTable[p[1]] == 0 && Utf8NBytesTable[p[2]] == 0 && Utf8NBytesTable[p[3]] == 0) {
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const u32 c = (static_cast<uint32_t>(p[0] & 0x7) << 18) | (static_cast<uint32_t>(p[1] & 0x3F) << 12) | (static_cast<uint32_t>(p[2] & 0x3F) << 6) | (static_cast<uint32_t>(p[3] & 0x3F) << 0);
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if (c >= 0x10000 && c < 0x110000) {
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*dst = c;
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return CharacterEncodingResult_Success;
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}
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}
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return CharacterEncodingResult_InvalidFormat;
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default:
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break;
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}
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/* We failed to convert. */
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return CharacterEncodingResult_InvalidFormat;
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}
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CharacterEncodingResult PickOutCharacterFromUtf8String(char *dst, const char **str) {
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/* Check pre-conditions. */
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AMS_ASSERT(dst != nullptr);
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AMS_ASSERT(str != nullptr);
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AMS_ASSERT(*str != nullptr);
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/* Clear the output. */
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dst[0] = 0;
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dst[1] = 0;
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dst[2] = 0;
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dst[3] = 0;
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/* Perform the conversion. */
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const unsigned char *p = reinterpret_cast<const unsigned char *>(*str);
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u32 c = *p;
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switch (Utf8NBytesTable[c]) {
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case 1:
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dst[0] = (*str)[0];
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++(*str);
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break;
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case 2:
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if ((p[0] & 0x1E) != 0) {
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if (Utf8NBytesTable[p[1]] == 0) {
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c = (static_cast<uint32_t>(p[0] & 0x1F) << 6) | (static_cast<uint32_t>(p[1] & 0x3F) << 0);
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dst[0] = (*str)[0];
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dst[1] = (*str)[1];
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(*str) += 2;
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break;
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}
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}
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return CharacterEncodingResult_InvalidFormat;
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case 3:
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if (Utf8NBytesTable[p[1]] == 0 && Utf8NBytesTable[p[2]] == 0) {
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c = (static_cast<uint32_t>(p[0] & 0xF) << 12) | (static_cast<uint32_t>(p[1] & 0x3F) << 6) | (static_cast<uint32_t>(p[2] & 0x3F) << 0);
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if ((c & 0xF800) != 0 && (c & 0xF800) != 0xD800) {
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dst[0] = (*str)[0];
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dst[1] = (*str)[1];
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dst[2] = (*str)[2];
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(*str) += 3;
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break;
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}
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}
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return CharacterEncodingResult_InvalidFormat;
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case 4:
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if (Utf8NBytesTable[p[1]] == 0 && Utf8NBytesTable[p[2]] == 0 && Utf8NBytesTable[p[3]] == 0) {
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c = (static_cast<uint32_t>(p[0] & 0x7) << 18) | (static_cast<uint32_t>(p[1] & 0x3F) << 12) | (static_cast<uint32_t>(p[2] & 0x3F) << 6) | (static_cast<uint32_t>(p[3] & 0x3F) << 0);
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if (c >= 0x10000 && c < 0x110000) {
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dst[0] = (*str)[0];
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dst[1] = (*str)[1];
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dst[2] = (*str)[2];
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dst[3] = (*str)[3];
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(*str) += 4;
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break;
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}
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}
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return CharacterEncodingResult_InvalidFormat;
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default:
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return CharacterEncodingResult_InvalidFormat;
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}
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return CharacterEncodingResult_Success;
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}
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}
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