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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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114 lines
3.7 KiB
C++
114 lines
3.7 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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#pragma once
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#include <stratosphere.hpp>
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namespace ams::htcfs {
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class CacheManager {
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private:
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os::SdkMutex m_mutex;
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void *m_cache;
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size_t m_cache_size;
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s64 m_cached_file_size;
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size_t m_cached_data_size;
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s32 m_cached_handle;
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bool m_has_cached_handle;
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public:
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CacheManager(void *cache, size_t cache_size) : m_mutex(), m_cache(cache), m_cache_size(cache_size), m_cached_file_size(), m_cached_data_size(), m_cached_handle(), m_has_cached_handle() { /* ... */ }
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public:
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bool GetFileSize(s64 *out, s32 handle) {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Get the cached size, if we match. */
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if (m_has_cached_handle && m_cached_handle == handle) {
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*out = m_cached_file_size;
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return true;
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} else {
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return false;
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}
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}
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void Invalidate() {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Note that we have no handle. */
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m_has_cached_handle = false;
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}
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void Invalidate(s32 handle) {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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if (m_has_cached_handle && m_cached_handle == handle) {
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/* Note that we have no handle. */
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m_has_cached_handle = false;
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}
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}
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void Record(s64 file_size, const void *data, s32 handle, size_t data_size) {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Set our cached file size. */
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m_cached_file_size = file_size;
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/* Set our cached data size. */
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m_cached_data_size = std::min(m_cache_size, data_size);
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/* Copy the data. */
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std::memcpy(m_cache, data, m_cached_data_size);
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/* Set our cache handle. */
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m_cached_handle = handle;
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/* Note that we have cached data. */
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m_has_cached_handle = true;
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}
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bool ReadFile(size_t *out, void *dst, s32 handle, size_t offset, size_t size) {
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/* Lock ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Check that we have a cached file. */
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if (!m_has_cached_handle) {
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return false;
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}
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/* Check the file is our cached one. */
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if (handle != m_cached_handle) {
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return false;
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}
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/* Check that we can read data. */
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if (offset + size > m_cached_data_size) {
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return false;
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}
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/* Copy the cached data. */
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std::memcpy(dst, static_cast<const u8 *>(m_cache) + offset, size);
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/* Set the output read size. */
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*out = size;
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return true;
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}
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};
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}
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