mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-13 23:46:40 +00:00
582 lines
22 KiB
C++
582 lines
22 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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#pragma once
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#include <stratosphere/fs/fs_common.hpp>
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#include <stratosphere/fs/fs_memory_management.hpp>
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#include <stratosphere/fs/impl/fs_common_mount_name.hpp>
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#include <stratosphere/fs/fs_path_utility.hpp>
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namespace ams::fs {
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class DirectoryPathParser;
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class Path {
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NON_COPYABLE(Path);
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NON_MOVEABLE(Path);
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private:
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static constexpr const char *EmptyPath = "";
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static constexpr size_t WriteBufferAlignmentLength = 8;
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private:
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friend class DirectoryPathParser;
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private:
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using WriteBuffer = std::unique_ptr<char[], ::ams::fs::impl::Deleter>;
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private:
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const char *m_str;
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util::TypedStorage<WriteBuffer> m_write_buffer;
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size_t m_write_buffer_length;
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bool m_is_normalized;
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public:
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Path() : m_str(EmptyPath), m_write_buffer_length(0), m_is_normalized(false) {
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util::ConstructAt(m_write_buffer, nullptr);
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}
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constexpr Path(const char *s, util::ConstantInitializeTag) : m_str(s), m_write_buffer(), m_write_buffer_length(0), m_is_normalized(true) {
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/* ... */
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}
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constexpr ~Path() {
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if (!std::is_constant_evaluated()) {
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util::DestroyAt(m_write_buffer);
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}
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}
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WriteBuffer ReleaseBuffer() {
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/* Check pre-conditions. */
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AMS_ASSERT(util::GetReference(m_write_buffer) != nullptr);
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/* Reset. */
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m_str = EmptyPath;
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m_write_buffer_length = 0;
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/* Return our write buffer. */
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return std::move(util::GetReference(m_write_buffer));
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}
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constexpr Result SetShallowBuffer(const char *buffer) {
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/* Check pre-conditions. */
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AMS_ASSERT(m_write_buffer_length == 0);
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/* Check the buffer is valid. */
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R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
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/* Set buffer. */
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this->SetReadOnlyBuffer(buffer);
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/* Note that we're normalized. */
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m_is_normalized = true;
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R_SUCCEED();
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}
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const char *GetString() const {
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/* Check pre-conditions. */
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AMS_ASSERT(m_is_normalized);
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return m_str;
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}
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size_t GetLength() const {
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return std::strlen(this->GetString());
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}
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bool IsEmpty() const {
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return *m_str == '\x00';
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}
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bool IsMatchHead(const char *p, size_t len) const {
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return util::Strncmp(this->GetString(), p, len) == 0;
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}
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Result Initialize(const Path &rhs) {
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/* Check the other path is normalized. */
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R_UNLESS(rhs.m_is_normalized, fs::ResultNotNormalized());
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/* Allocate buffer for our path. */
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const auto len = rhs.GetLength();
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R_TRY(this->Preallocate(len + 1));
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/* Copy the path. */
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const size_t copied = util::Strlcpy<char>(util::GetReference(m_write_buffer).get(), rhs.GetString(), len + 1);
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R_UNLESS(copied == len, fs::ResultUnexpectedInPathA());
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/* Set normalized. */
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m_is_normalized = rhs.m_is_normalized;
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R_SUCCEED();
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}
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Result Initialize(const char *path, size_t len) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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/* Initialize. */
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R_TRY(this->InitializeImpl(path, len));
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/* Set not normalized. */
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m_is_normalized = false;
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R_SUCCEED();
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}
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Result Initialize(const char *path) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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return this->Initialize(path, std::strlen(path));
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}
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Result InitializeWithFormat(const char *fmt, ...) __attribute__((format (printf, 2, 3))) {
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/* Check the format string is valid. */
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R_UNLESS(fmt != nullptr, fs::ResultNullptrArgument());
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/* Create the va_list for formatting. */
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std::va_list vl;
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va_start(vl, fmt);
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/* Determine how big the string will be. */
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char dummy;
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const auto len = util::VSNPrintf(std::addressof(dummy), 0, fmt, vl);
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/* Allocate buffer for our path. */
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R_TRY(this->Preallocate(len + 1));
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/* Format our path into our new buffer. */
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const auto real_len = util::VSNPrintf(util::GetReference(m_write_buffer).get(), m_write_buffer_length, fmt, vl);
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AMS_ASSERT(real_len == len);
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AMS_UNUSED(real_len);
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/* Finish the va_list. */
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va_end(vl);
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/* Set not normalized. */
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m_is_normalized = false;
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R_SUCCEED();
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}
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Result InitializeWithReplaceBackslash(const char *path) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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/* Initialize. */
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R_TRY(this->InitializeImpl(path, std::strlen(path)));
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/* Replace slashes as desired. */
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if (m_write_buffer_length > 1) {
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fs::Replace(this->GetWriteBuffer(), m_write_buffer_length - 1, '\\', '/');
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}
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/* Set not normalized. */
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m_is_normalized = false;
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R_SUCCEED();
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}
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Result InitializeWithReplaceForwardSlashes(const char *path) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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/* Initialize. */
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R_TRY(this->InitializeImpl(path, std::strlen(path)));
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/* Replace slashes as desired. */
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if (m_write_buffer_length > 1) {
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if (auto *p = this->GetWriteBuffer(); p[0] == '/' && p[1] == '/') {
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p[0] = '\\';
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p[1] = '\\';
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}
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}
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/* Set not normalized. */
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m_is_normalized = false;
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R_SUCCEED();
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}
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Result InitializeWithReplaceUnc(const char *path) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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/* Initialize. */
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R_TRY(this->InitializeImpl(path, std::strlen(path)));
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/* Set not normalized. */
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m_is_normalized = false;
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/* Replace unc as desired. */
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if (m_str[0]) {
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auto *p = this->GetWriteBuffer();
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/* Replace :/// -> \\ as needed. */
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if (auto *sep = std::strstr(p, ":///"); sep != nullptr) {
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sep[0] = '\\';
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sep[1] = '\\';
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}
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/* Edit path prefix. */
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if (!util::Strncmp(p, AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME AMS_FS_IMPL_MOUNT_NAME_DELIMITER "/", AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME_LEN + AMS_FS_IMPL_MOUNT_NAME_DELIMITER_LEN + 1)) {
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static_assert((AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME AMS_FS_IMPL_MOUNT_NAME_DELIMITER)[AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME_LEN + AMS_FS_IMPL_MOUNT_NAME_DELIMITER_LEN - 1] == '/');
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p[AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME_LEN + AMS_FS_IMPL_MOUNT_NAME_DELIMITER_LEN - 1] = '\\';
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p[AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME_LEN + AMS_FS_IMPL_MOUNT_NAME_DELIMITER_LEN - 0] = '\\';
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}
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if (p[0] == '/' && p[1] == '/') {
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p[0] = '\\';
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p[1] = '\\';
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}
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}
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R_SUCCEED();
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}
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Result InitializeWithNormalization(const char *path, size_t size) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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/* Initialize. */
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R_TRY(this->InitializeImpl(path, size));
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/* Set not normalized. */
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m_is_normalized = false;
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/* Perform normalization. */
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fs::PathFlags path_flags;
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if (fs::IsPathRelative(m_str)) {
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path_flags.AllowRelativePath();
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} else if (fs::IsWindowsPath(m_str, true)) {
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path_flags.AllowWindowsPath();
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} else {
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/* NOTE: In this case, Nintendo checks is normalized, then sets is normalized, then returns success. */
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/* This seems like a bug. */
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size_t dummy;
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R_TRY(PathFormatter::IsNormalized(std::addressof(m_is_normalized), std::addressof(dummy), m_str));
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m_is_normalized = true;
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R_SUCCEED();
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}
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/* Normalize. */
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R_TRY(this->Normalize(path_flags));
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m_is_normalized = true;
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R_SUCCEED();
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}
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Result InitializeWithNormalization(const char *path) {
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/* Check the path is valid. */
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R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
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R_RETURN(this->InitializeWithNormalization(path, std::strlen(path)));
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}
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Result InitializeAsEmpty() {
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/* Clear our buffer. */
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this->ClearBuffer();
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/* Set normalized. */
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m_is_normalized = true;
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R_SUCCEED();
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}
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Result AppendChild(const char *child) {
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/* Check the path is valid. */
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R_UNLESS(child != nullptr, fs::ResultNullptrArgument());
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/* Basic checks. If we hvea a path and the child is empty, we have nothing to do. */
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const char *c = child;
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if (m_str[0]) {
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/* Skip an early separator. */
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if (*c == '/') {
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++c;
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}
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R_SUCCEED_IF(*c == '\x00');
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}
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/* If we don't have a string, we can just initialize. */
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auto cur_len = std::strlen(m_str);
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if (cur_len == 0) {
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R_RETURN(this->Initialize(child));
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}
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/* Remove a trailing separator. */
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if (m_str[cur_len - 1] == '/' || m_str[cur_len - 1] == '\\') {
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--cur_len;
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}
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/* Get the child path's length. */
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auto child_len = std::strlen(c);
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/* Reset our write buffer. */
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WriteBuffer old_write_buffer;
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if (util::GetReference(m_write_buffer) != nullptr) {
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old_write_buffer = std::move(util::GetReference(m_write_buffer));
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this->ClearBuffer();
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}
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/* Pre-allocate the new buffer. */
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R_TRY(this->Preallocate(cur_len + 1 + child_len + 1));
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/* Get our write buffer. */
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auto *dst = this->GetWriteBuffer();
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if (old_write_buffer != nullptr && cur_len > 0) {
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util::Strlcpy<char>(dst, old_write_buffer.get(), cur_len + 1);
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}
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/* Add separator. */
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dst[cur_len] = '/';
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/* Copy the child path. */
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const size_t copied = util::Strlcpy<char>(dst + cur_len + 1, c, child_len + 1);
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R_UNLESS(copied == child_len, fs::ResultUnexpectedInPathA());
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R_SUCCEED();
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}
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Result AppendChild(const Path &rhs) {
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R_RETURN(this->AppendChild(rhs.GetString()));
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}
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Result Combine(const Path &parent, const Path &child) {
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/* Get the lengths. */
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const auto p_len = parent.GetLength();
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const auto c_len = child.GetLength();
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/* Allocate our buffer. */
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R_TRY(this->Preallocate(p_len + c_len + 1));
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/* Initialize as parent. */
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R_TRY(this->Initialize(parent));
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/* If we're empty, we can just initialize as child. */
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if (this->IsEmpty()) {
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R_TRY(this->Initialize(child));
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} else {
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/* Otherwise, we should append the child. */
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R_TRY(this->AppendChild(child));
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}
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R_SUCCEED();
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}
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Result RemoveChild() {
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/* If we don't have a write-buffer, ensure that we have one. */
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if (util::GetReference(m_write_buffer) == nullptr) {
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if (const auto len = std::strlen(m_str); len > 0) {
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R_TRY(this->Preallocate(len));
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util::Strlcpy<char>(util::GetReference(m_write_buffer).get(), m_str, len + 1);
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}
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}
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/* Check that it's possible for us to remove a child. */
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auto *p = this->GetWriteBuffer();
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s32 len = std::strlen(p);
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R_UNLESS(len != 1 || (p[0] != '/' && p[0] != '.'), fs::ResultNotImplemented());
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/* Handle a trailing separator. */
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if (len > 0 && (p[len - 1] == '\\' || p[len - 1] == '/')) {
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--len;
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}
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/* Remove the child path segment. */
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while ((--len) >= 0 && p[len]) {
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if (p[len] == '/' || p[len] == '\\') {
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if (len > 0) {
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p[len] = 0;
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} else {
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p[1] = 0;
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len = 1;
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}
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break;
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}
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}
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/* Check that length remains > 0. */
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R_UNLESS(len > 0, fs::ResultNotImplemented());
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R_SUCCEED();
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}
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Result Normalize(const PathFlags &flags) {
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/* If we're already normalized, nothing to do. */
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R_SUCCEED_IF(m_is_normalized);
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/* Check if we're normalized. */
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bool normalized;
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size_t dummy;
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R_TRY(PathFormatter::IsNormalized(std::addressof(normalized), std::addressof(dummy), m_str, flags));
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/* If we're not normalized, normalize. */
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if (!normalized) {
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/* Determine necessary buffer length. */
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auto len = m_write_buffer_length;
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if (flags.IsRelativePathAllowed() && fs::IsPathRelative(m_str)) {
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len += 2;
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}
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if (flags.IsWindowsPathAllowed() && fs::IsWindowsPath(m_str, true)) {
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len += 1;
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}
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/* Allocate a new buffer. */
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const size_t size = util::AlignUp(len, WriteBufferAlignmentLength);
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auto buf = fs::impl::MakeUnique<char[]>(size);
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R_UNLESS(buf != nullptr, fs::ResultAllocationFailureInMakeUnique());
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/* Normalize into it. */
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R_TRY(PathFormatter::Normalize(buf.get(), size, util::GetReference(m_write_buffer).get(), m_write_buffer_length, flags));
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/* Set the normalized buffer as our buffer. */
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this->SetModifiableBuffer(std::move(buf), size);
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}
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/* Set normalized. */
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m_is_normalized = true;
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R_SUCCEED();
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}
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private:
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void ClearBuffer() {
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util::GetReference(m_write_buffer).reset();
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m_write_buffer_length = 0;
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m_str = EmptyPath;
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}
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void SetModifiableBuffer(WriteBuffer &&buffer, size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(buffer.get() != nullptr);
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AMS_ASSERT(size > 0);
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AMS_ASSERT(util::IsAligned(size, WriteBufferAlignmentLength));
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/* Set write buffer. */
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util::GetReference(m_write_buffer) = std::move(buffer);
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m_write_buffer_length = size;
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m_str = util::GetReference(m_write_buffer).get();
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}
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constexpr void SetReadOnlyBuffer(const char *buffer) {
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m_str = buffer;
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if (!std::is_constant_evaluated()) {
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util::GetReference(m_write_buffer) = nullptr;
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m_write_buffer_length = 0;
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}
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}
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Result Preallocate(size_t length) {
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/* Allocate additional space, if needed. */
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if (length > m_write_buffer_length) {
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/* Allocate buffer. */
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const size_t size = util::AlignUp(length, WriteBufferAlignmentLength);
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auto buf = fs::impl::MakeUnique<char[]>(size);
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R_UNLESS(buf != nullptr, fs::ResultAllocationFailureInMakeUnique());
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/* Set write buffer. */
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this->SetModifiableBuffer(std::move(buf), size);
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}
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R_SUCCEED();
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}
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Result InitializeImpl(const char *path, size_t size) {
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if (size > 0 && path[0]) {
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/* Pre allocate a buffer for the path. */
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R_TRY(this->Preallocate(size + 1));
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/* Copy the path. */
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const size_t copied = util::Strlcpy<char>(this->GetWriteBuffer(), path, size + 1);
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R_UNLESS(copied >= size, fs::ResultUnexpectedInPathA());
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} else {
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/* We can just clear the buffer. */
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this->ClearBuffer();
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}
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R_SUCCEED();
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}
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char *GetWriteBuffer() {
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AMS_ASSERT(util::GetReference(m_write_buffer) != nullptr);
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return util::GetReference(m_write_buffer).get();
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}
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size_t GetWriteBufferLength() const {
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return m_write_buffer_length;
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}
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public:
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ALWAYS_INLINE bool operator==(const fs::Path &rhs) const { return std::strcmp(this->GetString(), rhs.GetString()) == 0; }
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ALWAYS_INLINE bool operator!=(const fs::Path &rhs) const { return !(*this == rhs); }
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ALWAYS_INLINE bool operator==(const char *p) const { return std::strcmp(this->GetString(), p) == 0; }
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ALWAYS_INLINE bool operator!=(const char *p) const { return !(*this == p); }
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};
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consteval fs::Path MakeConstantPath(const char *s) { return fs::Path(s, util::ConstantInitializeTag{}); }
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inline Result SetUpFixedPath(fs::Path *out, const char *s) {
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/* Verify the path is normalized. */
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bool normalized;
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size_t dummy;
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R_TRY(PathNormalizer::IsNormalized(std::addressof(normalized), std::addressof(dummy), s));
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R_UNLESS(normalized, fs::ResultInvalidPathFormat());
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/* Set the fixed path. */
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R_RETURN(out->SetShallowBuffer(s));
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}
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inline Result SetUpFixedPathSingleEntry(fs::Path *out, char *buf, size_t buf_size, const char *e) {
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/* Print the path into the buffer. */
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const size_t len = util::TSNPrintf(buf, buf_size, "/%s", e);
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R_UNLESS(len < buf_size, fs::ResultInvalidArgument());
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/* Set up the path. */
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R_RETURN(SetUpFixedPath(out, buf));
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}
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inline Result SetUpFixedPathDoubleEntry(fs::Path *out, char *buf, size_t buf_size, const char *e, const char *e2) {
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/* Print the path into the buffer. */
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const size_t len = util::TSNPrintf(buf, buf_size, "/%s/%s", e, e2);
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R_UNLESS(len < buf_size, fs::ResultInvalidArgument());
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/* Set up the path. */
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R_RETURN(SetUpFixedPath(out, buf));
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}
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inline Result SetUpFixedPathSaveId(fs::Path *out, char *buf, size_t buf_size, u64 id) {
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/* Print the path into the buffer. */
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const size_t len = util::TSNPrintf(buf, buf_size, "/%016" PRIx64 "", id);
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R_UNLESS(len < buf_size, fs::ResultInvalidArgument());
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/* Set up the path. */
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R_RETURN(SetUpFixedPath(out, buf));
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}
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inline Result SetUpFixedPathSaveMetaName(fs::Path *out, char *buf, size_t buf_size, u32 type) {
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/* Print the path into the buffer. */
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const size_t len = util::TSNPrintf(buf, buf_size, "/%08" PRIx32 ".meta", type);
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R_UNLESS(len < buf_size, fs::ResultInvalidArgument());
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/* Set up the path. */
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R_RETURN(SetUpFixedPath(out, buf));
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}
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inline Result SetUpFixedPathSaveMetaDir(fs::Path *out, char *buf, size_t buf_size, u64 id) {
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/* Print the path into the buffer. */
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|
const size_t len = util::TSNPrintf(buf, buf_size, "/saveMeta/%016" PRIx64 "", id);
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R_UNLESS(len < buf_size, fs::ResultInvalidArgument());
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/* Set up the path. */
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R_RETURN(SetUpFixedPath(out, buf));
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}
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}
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