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Atmosphere/stratosphere/ams_mitm/source/fs_mitm/fsmitm_romfs.hpp

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2019-12-04 14:53:52 +00:00
/*
* 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/>.
*/
#pragma once
#include <stratosphere.hpp>
namespace ams::mitm::fs::romfs {
enum class DataSourceType {
Storage,
File,
LooseSdFile,
Metadata,
Memory,
};
struct SourceInfo {
s64 virtual_offset;
s64 size;
union {
struct {
s64 offset;
} storage_source_info;
struct {
s64 offset;
} file_source_info;
struct {
char *path;
} loose_source_info;
struct {
ams::fs::fsa::IFile *file;
} metadata_source_info;
struct {
u8 *data;
} memory_source_info;
};
DataSourceType source_type;
bool cleaned_up;
SourceInfo(s64 v_o, s64 sz, DataSourceType type, s64 p_o) : virtual_offset(v_o), size(sz), source_type(type), cleaned_up(false) {
switch (this->source_type) {
case DataSourceType::Storage:
this->storage_source_info.offset = p_o;
break;
case DataSourceType::File:
this->file_source_info.offset = p_o;
break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
SourceInfo(s64 v_o, s64 sz, DataSourceType type, void *arg) : virtual_offset(v_o), size(sz), source_type(type), cleaned_up(false) {
switch (this->source_type) {
case DataSourceType::LooseSdFile:
this->loose_source_info.path = static_cast<char *>(arg);
break;
case DataSourceType::Metadata:
this->metadata_source_info.file = static_cast<ams::fs::fsa::IFile *>(arg);
break;
case DataSourceType::Memory:
this->memory_source_info.data = static_cast<u8 *>(arg);
break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
void Cleanup() {
AMS_ASSERT(!this->cleaned_up);
this->cleaned_up = true;
switch (this->source_type) {
case DataSourceType::Storage:
case DataSourceType::File:
break;
case DataSourceType::Metadata:
delete this->metadata_source_info.file;
break;
case DataSourceType::LooseSdFile:
delete[] this->loose_source_info.path;
break;
case DataSourceType::Memory:
std::free(static_cast<void *>(this->memory_source_info.data));
break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
};
constexpr inline bool operator<(const SourceInfo &lhs, const SourceInfo &rhs) {
return lhs.virtual_offset < rhs.virtual_offset;
}
constexpr inline bool operator<(const SourceInfo &lhs, const s64 rhs) {
return lhs.virtual_offset <= rhs;
}
struct BuildFileContext;
struct BuildDirectoryContext {
NON_COPYABLE(BuildDirectoryContext);
NON_MOVEABLE(BuildDirectoryContext);
std::unique_ptr<char[]> path;
BuildDirectoryContext *parent;
BuildDirectoryContext *child;
BuildDirectoryContext *sibling;
BuildFileContext *file;
u32 cur_path_ofs;
u32 path_len;
u32 entry_offset;
struct RootTag{};
BuildDirectoryContext(RootTag) : parent(nullptr), child(nullptr), sibling(nullptr), file(nullptr), cur_path_ofs(0), path_len(0), entry_offset(0) {
this->path = std::make_unique<char[]>(1);
}
BuildDirectoryContext(const char *parent_path, size_t parent_path_len, const char *entry_name, size_t entry_name_len) : parent(nullptr), child(nullptr), sibling(nullptr), file(nullptr), entry_offset(0) {
this->cur_path_ofs = parent_path_len + 1;
this->path_len = this->cur_path_ofs + entry_name_len;
this->path = std::unique_ptr<char[]>(new char[this->path_len + 1]);
std::memcpy(this->path.get(), parent_path, parent_path_len);
this->path[parent_path_len] = '/';
std::memcpy(this->path.get() + parent_path_len + 1, entry_name, entry_name_len);
this->path[this->path_len] = 0;
}
};
struct BuildFileContext {
NON_COPYABLE(BuildFileContext);
NON_MOVEABLE(BuildFileContext);
std::unique_ptr<char[]> path;
BuildDirectoryContext *parent;
BuildFileContext *sibling;
s64 offset;
s64 size;
s64 orig_offset;
u32 cur_path_ofs;
u32 path_len;
u32 entry_offset;
DataSourceType source_type;
BuildFileContext(const char *parent_path, size_t parent_path_len, const char *entry_name, size_t entry_name_len, s64 sz, s64 o_o, DataSourceType type) : parent(nullptr), sibling(nullptr), offset(0), size(sz), orig_offset(o_o), entry_offset(0), source_type(type) {
this->cur_path_ofs = parent_path_len + 1;
this->path_len = this->cur_path_ofs + entry_name_len;
this->path = std::unique_ptr<char[]>(new char[this->path_len + 1]);
std::memcpy(this->path.get(), parent_path, parent_path_len);
this->path[parent_path_len] = '/';
std::memcpy(this->path.get() + parent_path_len + 1, entry_name, entry_name_len);
this->path[this->path_len] = 0;
}
};
struct Builder {
NON_COPYABLE(Builder);
NON_MOVEABLE(Builder);
private:
struct PathCompare {
static constexpr inline int Compare(const char *a, const char *b) {
unsigned char c1{}, c2{};
while ((c1 = *a++) == (c2 = *b++)) {
if (c1 == '\x00') {
return 0;
}
}
return (c1 - c2);
}
constexpr bool operator()(const char *a, const char *b) const {
return PathCompare::Compare(a, b) < 0;
}
};
template<typename T>
using PathMap = std::map<const char *, std::unique_ptr<T>, PathCompare>;
private:
ncm::ProgramId program_id;
BuildDirectoryContext *root;
PathMap<BuildDirectoryContext> directories;
PathMap<BuildFileContext> files;
size_t num_dirs;
size_t num_files;
size_t dir_table_size;
size_t file_table_size;
size_t dir_hash_table_size;
size_t file_hash_table_size;
size_t file_partition_size;
ams::fs::DirectoryEntry dir_entry;
DataSourceType cur_source_type;
private:
void VisitDirectory(FsFileSystem *fs, BuildDirectoryContext *parent);
void VisitDirectory(BuildDirectoryContext *parent, u32 parent_offset, const void *dir_table, size_t dir_table_size, const void *file_table, size_t file_table_size);
void AddDirectory(BuildDirectoryContext **out, BuildDirectoryContext *parent_ctx, std::unique_ptr<BuildDirectoryContext> file_ctx);
void AddFile(BuildDirectoryContext *parent_ctx, std::unique_ptr<BuildFileContext> file_ctx);
public:
Builder(ncm::ProgramId pr_id);
void AddSdFiles();
void AddStorageFiles(ams::fs::IStorage *storage, DataSourceType source_type);
void Build(std::vector<SourceInfo> *out_infos);
};
}