mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-18 16:32:05 +00:00
91 lines
2.7 KiB
C++
91 lines
2.7 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 <stratosphere.hpp>
|
|
|
|
namespace ams::diag::impl {
|
|
|
|
namespace {
|
|
|
|
bool IsHeadOfCharacter(u8 c) {
|
|
return (c & 0xC0) != 0x80;
|
|
}
|
|
|
|
size_t GetCharacterSize(u8 c) {
|
|
if ((c & 0x80) == 0) {
|
|
return 1;
|
|
} else if ((c & 0xE0) == 0xC0) {
|
|
return 2;
|
|
} else if ((c & 0xF0) == 0xE0) {
|
|
return 3;
|
|
} else if ((c & 0xF8) == 0xF0) {
|
|
return 4;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const char *FindLastCharacterPointer(const char *str, size_t len) {
|
|
/* Find the head of the last character. */
|
|
const char *cur;
|
|
for (cur = str + len - 1; cur >= str && !IsHeadOfCharacter(*reinterpret_cast<const u8 *>(cur)); --cur) {
|
|
/* ... */
|
|
}
|
|
|
|
/* Return the last character. */
|
|
if (AMS_LIKELY(cur >= str)) {
|
|
return cur;
|
|
} else {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
int GetValidSizeAsUtf8String(const char *str, size_t len) {
|
|
/* Check pre-condition. */
|
|
AMS_ASSERT(str != nullptr);
|
|
|
|
/* Check if we have no data. */
|
|
if (len == 0) {
|
|
return 0;
|
|
}
|
|
|
|
/* Get the last character pointer. */
|
|
const auto *last_char_ptr = FindLastCharacterPointer(str, len);
|
|
if (last_char_ptr == nullptr) {
|
|
return -1;
|
|
}
|
|
|
|
/* Get sizes. */
|
|
const size_t actual_size = (str + len) - last_char_ptr;
|
|
const size_t last_char_size = GetCharacterSize(*reinterpret_cast<const u8 *>(last_char_ptr));
|
|
if (last_char_size == 0) {
|
|
return -1;
|
|
} else if (actual_size >= last_char_size) {
|
|
if (actual_size == last_char_size) {
|
|
return len;
|
|
} else {
|
|
return -1;
|
|
}
|
|
} else if (actual_size >= len) {
|
|
AMS_ASSERT(actual_size == len);
|
|
return -1;
|
|
} else {
|
|
return static_cast<int>(len - actual_size);
|
|
}
|
|
}
|
|
|
|
}
|