mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-11-16 01:49:32 +00:00
260 lines
8.7 KiB
C++
260 lines
8.7 KiB
C++
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/*
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* Copyright (c) 2018-2020 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 <exosphere.hpp>
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#include "../fatfs/ff.h"
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#include "fatal_fs_api.hpp"
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namespace ams::fs {
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namespace {
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constexpr size_t MaxFiles = 8;
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constinit bool g_is_sd_mounted = false;
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FATFS g_sd_fs;
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constinit FIL g_files[MaxFiles] = {};
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constinit bool g_files_opened[MaxFiles] = {};
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constinit int g_open_modes[MaxFiles] = {};
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Result TranslateFatFsError(FRESULT res) {
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switch (res) {
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case FR_OK:
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return ResultSuccess();
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case FR_DISK_ERR:
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return fs::ResultMmcAccessFailed();
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case FR_INT_ERR:
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return fs::ResultPreconditionViolation();
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case FR_NOT_READY:
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return fs::ResultMmcAccessFailed();
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case FR_NO_FILE:
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return fs::ResultPathNotFound();
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case FR_NO_PATH:
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return fs::ResultPathNotFound();
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case FR_INVALID_NAME:
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return fs::ResultInvalidPath();
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case FR_DENIED:
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return fs::ResultPermissionDenied();
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case FR_EXIST:
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return fs::ResultPathAlreadyExists();
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case FR_INVALID_OBJECT:
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return fs::ResultInvalidArgument();
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case FR_WRITE_PROTECTED:
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return fs::ResultWriteNotPermitted();
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case FR_INVALID_DRIVE:
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return fs::ResultInvalidMountName();
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case FR_NOT_ENABLED:
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return fs::ResultInvalidMountName(); /* BAD/TODO */
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case FR_NO_FILESYSTEM:
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return fs::ResultInvalidMountName(); /* BAD/TODO */
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case FR_TIMEOUT:
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return fs::ResultTargetLocked(); /* BAD/TODO */
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case FR_LOCKED:
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return fs::ResultTargetLocked();
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case FR_NOT_ENOUGH_CORE:
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return fs::ResultPreconditionViolation(); /* BAD/TODO */
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case FR_TOO_MANY_OPEN_FILES:
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return fs::ResultPreconditionViolation(); /* BAD/TODO */
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case FR_INVALID_PARAMETER:
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return fs::ResultInvalidArgument();
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default:
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return fs::ResultInternal();
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}
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}
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int TranslateToFatFsMode(int mode) {
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int fmode = FA_OPEN_EXISTING;
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if ((mode & OpenMode_Read) != 0) {
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fmode |= FA_READ;
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}
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if ((mode & OpenMode_Write) != 0) {
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fmode |= FA_WRITE;
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}
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if ((mode & OpenMode_AllowAppend) != 0) {
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fmode |= FA_OPEN_APPEND;
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}
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return fmode;
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}
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FIL *GetInternalFile(FileHandle handle) {
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return static_cast<FIL *>(handle._handle);
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}
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ALWAYS_INLINE size_t GetFileIndex(FIL *fp) {
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const size_t file_index = (fp - g_files);
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AMS_ASSERT(file_index < MaxFiles);
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return file_index;
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}
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}
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bool MountSdCard() {
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AMS_ASSERT(!g_is_sd_mounted);
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g_is_sd_mounted = f_mount(std::addressof(g_sd_fs), "", 1) == FR_OK;
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return g_is_sd_mounted;
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}
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void UnmountSdCard() {
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AMS_ASSERT(g_is_sd_mounted);
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f_unmount("");
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g_is_sd_mounted = false;
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}
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Result CreateFile(const char *path, s64 size) {
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/* Create the file. */
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FIL fp;
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R_TRY(TranslateFatFsError(f_open(std::addressof(fp), path, FA_CREATE_NEW | FA_READ | FA_WRITE)));
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/* Ensure that we close the file when we're done with it. */
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ON_SCOPE_EXIT { f_close(std::addressof(fp)); };
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/* Expand the file. */
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R_TRY(TranslateFatFsError(f_expand(std::addressof(fp), size, 1)));
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return ResultSuccess();
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}
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Result CreateDirectory(const char *path) {
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return TranslateFatFsError(f_mkdir(path));
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}
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Result OpenFile(FileHandle *out_file, const char *path, int mode) {
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/* Find a free file. */
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for (size_t i = 0; i < MaxFiles; ++i) {
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if (!g_files_opened[i]) {
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/* Open the file. */
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FIL *fp = std::addressof(g_files[i]);
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R_TRY(TranslateFatFsError(f_open(fp, path, TranslateToFatFsMode(mode))));
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/* Set the output. */
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out_file->_handle = fp;
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g_files_opened[i] = true;
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g_open_modes[i] = mode;
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return ResultSuccess();
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}
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}
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return fs::ResultOpenCountLimit();
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}
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Result ReadFile(FileHandle handle, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) {
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/* Option is unused. */
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AMS_UNUSED(option);
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/* Seek to the offset we're reading at. */
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R_TRY(TranslateFatFsError(f_lseek(GetInternalFile(handle), offset)));
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/* Read the data. */
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u32 br;
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R_TRY(TranslateFatFsError(f_read(GetInternalFile(handle), buffer, size, std::addressof(br))));
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/* Check that we read the correct amount. */
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R_UNLESS(br == size, fs::ResultOutOfRange());
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return ResultSuccess();
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}
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Result ReadFile(FileHandle handle, s64 offset, void *buffer, size_t size) {
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return ReadFile(handle, offset, buffer, size, fs::ReadOption::None);
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}
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Result ReadFile(size_t *out, FileHandle handle, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) {
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/* Option is unused. */
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AMS_UNUSED(option);
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/* Seek to the offset we're reading at. */
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R_TRY(TranslateFatFsError(f_lseek(GetInternalFile(handle), offset)));
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/* Read the data. */
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u32 br;
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R_TRY(TranslateFatFsError(f_read(GetInternalFile(handle), buffer, size, std::addressof(br))));
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/* Set the output size. */
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*out = br;
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return ResultSuccess();
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}
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Result ReadFile(size_t *out, FileHandle handle, s64 offset, void *buffer, size_t size) {
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return ReadFile(out, handle, offset, buffer, size, fs::ReadOption::None);
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}
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Result GetFileSize(s64 *out, FileHandle handle) {
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FIL *fp = GetInternalFile(handle);
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*out = f_size(fp);
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return ResultSuccess();
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}
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Result FlushFile(FileHandle handle) {
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return TranslateFatFsError(f_sync(GetInternalFile(handle)));
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}
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Result WriteFile(FileHandle handle, s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) {
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/* Seek to the offset we're writing at. */
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R_TRY(TranslateFatFsError(f_lseek(GetInternalFile(handle), offset)));
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/* Write the data. */
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u32 bw;
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R_TRY(TranslateFatFsError(f_write(GetInternalFile(handle), buffer, size, std::addressof(bw))));
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/* Check that we wrote the correct amount. */
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R_UNLESS(bw == size, fs::ResultOutOfRange());
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/* If we should, flush the file. */
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if (option.HasFlushFlag()) {
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R_TRY(FlushFile(handle));
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}
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return ResultSuccess();
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}
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Result SetFileSize(FileHandle handle, s64 size) {
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FIL *fp = GetInternalFile(handle);
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/* Check if we have nothing to do. */
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const size_t fsize = f_size(fp);
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R_SUCCEED_IF(static_cast<FSIZE_t>(size) == fsize);
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/* NOTE/TODO: This may not preserve file data. Do this in a way that does? */
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/* Truncate the file. */
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R_TRY(TranslateFatFsError(f_truncate(fp)));
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/* Expand the file. */
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R_TRY(TranslateFatFsError(f_expand(fp, size, 1)));
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/* Ensure the file is synchronized. */
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R_TRY(FlushFile(handle));
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/* Check that our expansion succeeded. */
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AMS_ASSERT(f_size(fp) == static_cast<FSIZE_t>(size));
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return ResultSuccess();
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}
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int GetFileOpenMode(FileHandle handle) {
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return g_open_modes[GetFileIndex(GetInternalFile(handle))];
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}
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void CloseFile(FileHandle handle) {
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const size_t index = GetFileIndex(GetInternalFile(handle));
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f_close(std::addressof(g_files[index]));
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g_open_modes[index] = 0;
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g_files_opened[index] = false;
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}
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}
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