Atmosphere/stratosphere/ams_mitm/source/fs_mitm/fsmitm_layeredrom.cpp

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/*
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* Copyright (c) 2018-2019 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/>.
*/
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#include <switch.h>
#include <stratosphere.hpp>
#include "fsmitm_layeredrom.hpp"
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#include "../utils.hpp"
#include "../debug.hpp"
IStorage::~IStorage() = default;
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LayeredRomFS::LayeredRomFS(std::shared_ptr<IROStorage> s_r, std::shared_ptr<IROStorage> f_r, u64 tid) : storage_romfs(s_r), file_romfs(f_r), title_id(tid) {
/* Start building the new virtual romfs. */
RomFSBuildContext build_ctx(this->title_id);
this->p_source_infos = std::shared_ptr<std::vector<RomFSSourceInfo>>(new std::vector<RomFSSourceInfo>(), [](std::vector<RomFSSourceInfo> *to_delete) {
for (unsigned int i = 0; i < to_delete->size(); i++) {
(*to_delete)[i].Cleanup();
}
delete to_delete;
});
if (Utils::IsSdInitialized()) {
build_ctx.MergeSdFiles();
}
if (this->file_romfs) {
build_ctx.MergeRomStorage(this->file_romfs.get(), RomFSDataSource::FileRomFS);
}
if (this->storage_romfs) {
build_ctx.MergeRomStorage(this->storage_romfs.get(), RomFSDataSource::BaseRomFS);
}
build_ctx.Build(this->p_source_infos.get());
}
Result LayeredRomFS::Read(void *buffer, size_t size, u64 offset) {
/* Size zero reads should always succeed. */
if (size == 0) {
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return ResultSuccess;
}
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/* Validate size. */
u64 virt_size = (*this->p_source_infos)[this->p_source_infos->size() - 1].virtual_offset + (*this->p_source_infos)[this->p_source_infos->size() - 1].size;
if (offset >= virt_size) {
return ResultFsInvalidOffset;
}
if (virt_size - offset < size) {
size = virt_size - offset;
}
/* Find first source info via binary search. */
u32 cur_source_ind = 0;
u32 low = 0, high = this->p_source_infos->size() - 1;
while (low <= high) {
u32 mid = (low + high) / 2;
if ((*this->p_source_infos)[mid].virtual_offset > offset) {
/* Too high. */
high = mid - 1;
} else {
/* sources[mid].virtual_offset <= offset, invariant */
if (mid == this->p_source_infos->size() - 1 || (*this->p_source_infos)[mid + 1].virtual_offset > offset) {
/* Success */
cur_source_ind = mid;
break;
}
low = mid + 1;
}
}
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size_t read_so_far = 0;
while (read_so_far < size) {
RomFSSourceInfo *cur_source = &((*this->p_source_infos)[cur_source_ind]);
if (cur_source->virtual_offset + cur_source->size > offset) {
u64 cur_read_size = size - read_so_far;
if (cur_read_size > cur_source->size - (offset - cur_source->virtual_offset)) {
cur_read_size = cur_source->size - (offset - cur_source->virtual_offset);
}
switch (cur_source->type) {
case RomFSDataSource::MetaData:
{
FsFile file;
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R_ASSERT(Utils::OpenSdFileForAtmosphere(this->title_id, ROMFS_METADATA_FILE_PATH, FS_OPEN_READ, &file));
size_t out_read;
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R_ASSERT(fsFileRead(&file, (offset - cur_source->virtual_offset), (void *)((uintptr_t)buffer + read_so_far), cur_read_size, FS_READOPTION_NONE, &out_read));
STS_ASSERT(out_read == cur_read_size);
fsFileClose(&file);
}
break;
case RomFSDataSource::LooseFile:
{
FsFile file;
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R_ASSERT(Utils::OpenRomFSSdFile(this->title_id, cur_source->loose_source_info.path, FS_OPEN_READ, &file));
size_t out_read;
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R_ASSERT(fsFileRead(&file, (offset - cur_source->virtual_offset), (void *)((uintptr_t)buffer + read_so_far), cur_read_size, FS_READOPTION_NONE, &out_read));
STS_ASSERT(out_read == cur_read_size);
fsFileClose(&file);
}
break;
case RomFSDataSource::Memory:
{
memcpy((void *)((uintptr_t)buffer + read_so_far), cur_source->memory_source_info.data + (offset - cur_source->virtual_offset), cur_read_size);
}
break;
case RomFSDataSource::BaseRomFS:
{
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R_ASSERT(this->storage_romfs->Read((void *)((uintptr_t)buffer + read_so_far), cur_read_size, cur_source->base_source_info.offset + (offset - cur_source->virtual_offset)));
}
break;
case RomFSDataSource::FileRomFS:
{
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R_ASSERT(this->file_romfs->Read((void *)((uintptr_t)buffer + read_so_far), cur_read_size, cur_source->base_source_info.offset + (offset - cur_source->virtual_offset)));
}
break;
default:
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std::abort();
break;
}
read_so_far += cur_read_size;
offset += cur_read_size;
} else {
/* Handle padding explicitly. */
cur_source_ind++;
/* Zero out the padding we skip, here. */
memset((void *)((uintptr_t)buffer + read_so_far), 0, ((*this->p_source_infos)[cur_source_ind]).virtual_offset - offset);
read_so_far += ((*this->p_source_infos)[cur_source_ind]).virtual_offset - offset;
offset = ((*this->p_source_infos)[cur_source_ind]).virtual_offset;
}
}
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return ResultSuccess;
}
Result LayeredRomFS::GetSize(u64 *out_size) {
*out_size = (*this->p_source_infos)[this->p_source_infos->size() - 1].virtual_offset + (*this->p_source_infos)[this->p_source_infos->size() - 1].size;
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return ResultSuccess;
}
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Result LayeredRomFS::OperateRange(FsOperationId operation_type, u64 offset, u64 size, FsRangeInfo *out_range_info) {
/* TODO: How should I implement this for a virtual romfs? */
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if (operation_type == FsOperationId_QueryRange) {
*out_range_info = {0};
}
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return ResultSuccess;
}