mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-14 16:06:56 +00:00
121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
/*
|
|
* Copyright (c) Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <vapours.hpp>
|
|
|
|
namespace ams::util {
|
|
|
|
namespace {
|
|
|
|
constexpr inline const u8 CodePointByteLengthTable[0x100] = {
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
|
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
|
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
|
|
4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
};
|
|
|
|
constexpr ALWAYS_INLINE size_t GetCodePointByteLength(u8 c) {
|
|
return CodePointByteLengthTable[c];
|
|
}
|
|
|
|
constexpr ALWAYS_INLINE bool IsValidTail(u8 c) {
|
|
return (c & 0xC0) == 0x80;
|
|
}
|
|
|
|
constexpr inline bool VerifyCode(const u8 *code, size_t size) {
|
|
switch (size) {
|
|
case 1:
|
|
break;
|
|
case 2:
|
|
if (!IsValidTail(code[1])) {
|
|
return false;
|
|
}
|
|
break;
|
|
case 3:
|
|
if (code[0] == 0xE0 && (code[1] & 0x20) == 0x00) {
|
|
return false;
|
|
}
|
|
if (code[0] == 0xED && (code[1] & 0x20) != 0x00) {
|
|
return false;
|
|
}
|
|
if (!IsValidTail(code[1]) || !IsValidTail(code[2])) {
|
|
return false;
|
|
}
|
|
break;
|
|
case 4:
|
|
if (code[0] == 0xF0 && (code[1] & 0x30) == 0x00) {
|
|
return false;
|
|
}
|
|
if (code[0] == 0xF4 && (code[1] & 0x30) != 0x00) {
|
|
return false;
|
|
}
|
|
if (!IsValidTail(code[1]) || !IsValidTail(code[2]) || !IsValidTail(code[3])) {
|
|
return false;
|
|
}
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
bool VerifyUtf8String(const char *str, size_t size) {
|
|
return GetCodePointCountOfUtf8String(str, size) != -1;
|
|
}
|
|
|
|
int GetCodePointCountOfUtf8String(const char *str, size_t size) {
|
|
/* Check pre-conditions. */
|
|
AMS_ASSERT(str != nullptr);
|
|
AMS_ASSERT(size > 0);
|
|
|
|
/* Parse codepoints. */
|
|
int count = 0;
|
|
|
|
while (size > 0) {
|
|
/* Get and check the current codepoint. */
|
|
const u8 *code = reinterpret_cast<const u8 *>(str);
|
|
const size_t code_size = GetCodePointByteLength(code[0]);
|
|
|
|
if (code_size > size || !VerifyCode(code, code_size)) {
|
|
return -1;
|
|
}
|
|
|
|
/* Advance. */
|
|
str += code_size;
|
|
size -= code_size;
|
|
|
|
/* Increment count. */
|
|
++count;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
}
|