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https://github.com/Atmosphere-NX/Atmosphere.git
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122 lines
4.1 KiB
C++
122 lines
4.1 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 const u8 CodePointByteLengthTable[0x100] = {
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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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0, 0, 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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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constexpr ALWAYS_INLINE size_t GetCodePointByteLength(u8 c) {
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return CodePointByteLengthTable[c];
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}
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constexpr ALWAYS_INLINE bool IsValidTail(u8 c) {
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return (c & 0xC0) == 0x80;
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}
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constexpr inline bool VerifyCode(const u8 *code, size_t size) {
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switch (size) {
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case 1:
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break;
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case 2:
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if (!IsValidTail(code[1])) {
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return false;
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}
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break;
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case 3:
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if (code[0] == 0xE0 && (code[1] & 0x20) == 0x00) {
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return false;
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}
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if (code[0] == 0xED && (code[1] & 0x20) != 0x00) {
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return false;
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}
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if (!IsValidTail(code[1]) || !IsValidTail(code[2])) {
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return false;
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}
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break;
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case 4:
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if (code[0] == 0xF0 && (code[1] & 0x30) == 0x00) {
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return false;
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}
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if (code[0] == 0xF4 && (code[1] & 0x30) != 0x00) {
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return false;
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}
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if (!IsValidTail(code[1]) || !IsValidTail(code[2]) || !IsValidTail(code[3])) {
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return false;
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}
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break;
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default:
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return false;
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}
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return true;
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}
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}
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bool VerifyUtf8String(const char *str, size_t size) {
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return GetCodePointCountOfUtf8String(str, size) != -1;
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}
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int GetCodePointCountOfUtf8String(const char *str, size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(str != nullptr);
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AMS_ASSERT(size > 0);
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/* Parse codepoints. */
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int count = 0;
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while (size > 0) {
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/* Get and check the current codepoint. */
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const u8 *code = reinterpret_cast<const u8 *>(str);
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const size_t code_size = GetCodePointByteLength(code[0]);
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if (code_size > size || !VerifyCode(code, code_size)) {
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return -1;
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}
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/* Advance. */
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str += code_size;
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size -= code_size;
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/* Increment count. */
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++count;
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}
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return count;
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}
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}
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