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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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123 lines
4.3 KiB
C++
123 lines
4.3 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.hpp>
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namespace ams::ncm {
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class FileMapperFile {
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public:
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enum class OpenMode {
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Read,
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ReadWrite,
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ReadWriteAppend,
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};
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private:
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const char *m_path;
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OpenMode m_mode;
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util::optional<fs::FileHandle> m_file;
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size_t m_file_size;
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size_t m_max_size;
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public:
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FileMapperFile() : m_file(util::nullopt) { /* ... */ }
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~FileMapperFile() {
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this->Finalize();
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}
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Result Initialize(const char *path, OpenMode mode) {
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/* Set our path/mode. */
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m_path = path;
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m_mode = mode;
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/* Ensure we're open. */
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R_TRY(this->EnsureOpen());
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/* Get the file size. */
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s64 size;
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R_TRY(fs::GetFileSize(std::addressof(size), m_file.value()));
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/* Set our file size/loaded size. */
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m_file_size = static_cast<size_t>(size);
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m_max_size = static_cast<size_t>(size);
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R_SUCCEED();
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}
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void Finalize() {
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/* If we have a file, close (and flush) it. */
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if (m_file.has_value()) {
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if (m_mode != OpenMode::Read) {
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R_ABORT_UNLESS(fs::FlushFile(m_file.value()));
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}
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fs::CloseFile(m_file.value());
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m_file = util::nullopt;
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}
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}
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size_t GetFileSize() const { return m_file_size; }
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size_t GetMaxSize() const { return m_max_size; }
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Result Read(size_t offset, void *dst, size_t size) {
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/* Determine the end offset. */
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const size_t end_offset = offset + size;
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/* Unless we're allowed to append, we need to have a big enough file. */
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if (m_mode != OpenMode::ReadWriteAppend) {
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R_UNLESS(end_offset <= m_file_size, ncm::ResultMapperInvalidArgument());
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}
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/* Clear the output. */
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std::memset(dst, 0, size);
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/* Check that our offset is valid. */
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R_UNLESS(offset <= m_file_size, ncm::ResultMapperInvalidArgument());
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/* Ensure we're open. */
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R_TRY(this->EnsureOpen());
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/* Read what we can. */
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const size_t read_size = (offset + size >= m_file_size) ? (m_file_size - offset) : size;
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AMS_ASSERT(read_size >= size);
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R_TRY(fs::ReadFile(m_file.value(), offset, dst, read_size));
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/* Update our max size. */
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m_max_size = std::max<size_t>(m_max_size, offset + read_size);
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R_SUCCEED();
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}
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private:
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Result EnsureOpen() {
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/* If we've opened, we're done. */
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R_SUCCEED_IF(m_file.has_value());
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/* Open based on our mode. */
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fs::FileHandle file;
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switch (m_mode) {
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case OpenMode::Read: R_TRY(fs::OpenFile(std::addressof(file), m_path, fs::OpenMode_Read)); break;
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case OpenMode::ReadWrite: R_TRY(fs::OpenFile(std::addressof(file), m_path, fs::OpenMode_ReadWrite)); break;
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case OpenMode::ReadWriteAppend: R_TRY(fs::OpenFile(std::addressof(file), m_path, fs::OpenMode_All)); break;
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AMS_UNREACHABLE_DEFAULT_CASE();
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}
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/* Set our file. */
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m_file = file;
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R_SUCCEED();
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}
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};
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} |