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