mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-27 04:36:04 +00:00
113 lines
3.7 KiB
C++
113 lines
3.7 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/>.
|
|
*/
|
|
#pragma once
|
|
#include <stratosphere.hpp>
|
|
|
|
namespace ams::htcfs {
|
|
|
|
class CacheManager {
|
|
private:
|
|
os::SdkMutex m_mutex;
|
|
void *m_cache;
|
|
size_t m_cache_size;
|
|
s64 m_cached_file_size;
|
|
size_t m_cached_data_size;
|
|
s32 m_cached_handle;
|
|
bool m_has_cached_handle;
|
|
public:
|
|
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() { /* ... */ }
|
|
public:
|
|
bool GetFileSize(s64 *out, s32 handle) {
|
|
/* Lock ourselves. */
|
|
std::scoped_lock lk(m_mutex);
|
|
|
|
/* Get the cached size, if we match. */
|
|
if (m_has_cached_handle && m_cached_handle == handle) {
|
|
*out = m_cached_file_size;
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void Invalidate() {
|
|
/* Lock ourselves. */
|
|
std::scoped_lock lk(m_mutex);
|
|
|
|
/* Note that we have no handle. */
|
|
m_has_cached_handle = false;
|
|
}
|
|
|
|
void Invalidate(s32 handle) {
|
|
/* Lock ourselves. */
|
|
std::scoped_lock lk(m_mutex);
|
|
|
|
if (m_has_cached_handle && m_cached_handle == handle) {
|
|
/* Note that we have no handle. */
|
|
m_has_cached_handle = false;
|
|
}
|
|
}
|
|
|
|
void Record(s64 file_size, const void *data, s32 handle, size_t data_size) {
|
|
/* Lock ourselves. */
|
|
std::scoped_lock lk(m_mutex);
|
|
|
|
/* Set our cached file size. */
|
|
m_cached_file_size = file_size;
|
|
|
|
/* Set our cached data size. */
|
|
m_cached_data_size = std::min(m_cache_size, data_size);
|
|
|
|
/* Copy the data. */
|
|
std::memcpy(m_cache, data, m_cached_data_size);
|
|
|
|
/* Set our cache handle. */
|
|
m_cached_handle = handle;
|
|
|
|
/* Note that we have cached data. */
|
|
m_has_cached_handle = true;
|
|
}
|
|
|
|
bool ReadFile(size_t *out, void *dst, s32 handle, size_t offset, size_t size) {
|
|
/* Lock ourselves. */
|
|
std::scoped_lock lk(m_mutex);
|
|
|
|
/* Check that we have a cached file. */
|
|
if (!m_has_cached_handle) {
|
|
return false;
|
|
}
|
|
|
|
/* Check the file is our cached one. */
|
|
if (handle != m_cached_handle) {
|
|
return false;
|
|
}
|
|
|
|
/* Check that we can read data. */
|
|
if (offset + size > m_cached_data_size) {
|
|
return false;
|
|
}
|
|
|
|
/* Copy the cached data. */
|
|
std::memcpy(dst, static_cast<const u8 *>(m_cache) + offset, size);
|
|
|
|
/* Set the output read size. */
|
|
*out = size;
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
}
|