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

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/*
2019-04-08 04:00:49 +02:00
* 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 <cstdlib>
#include <switch.h>
#include <map>
#include "fsmitm_romstorage.hpp"
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#include "../debug.hpp"
#define ROMFS_ENTRY_EMPTY 0xFFFFFFFF
#define ROMFS_FILEPARTITION_OFS 0x200
#define ROMFS_METADATA_FILE_PATH "romfs_metadata.bin"
/* Types for RomFS Meta construction. */
enum class RomFSDataSource {
BaseRomFS,
FileRomFS,
LooseFile,
MetaData,
Memory,
};
struct RomFSBaseSourceInfo {
u64 offset;
};
struct RomFSFileSourceInfo {
u64 offset;
};
struct RomFSLooseSourceInfo {
const char *path;
};
struct RomFSMemorySourceInfo {
const u8 *data;
};
struct RomFSMetaDataSourceInfo {
};
struct RomFSSourceInfo {
u64 virtual_offset;
u64 size;
union {
RomFSBaseSourceInfo base_source_info;
RomFSFileSourceInfo file_source_info;
RomFSLooseSourceInfo loose_source_info;
RomFSMemorySourceInfo memory_source_info;
RomFSMemorySourceInfo metadata_source_info;
};
RomFSDataSource type;
RomFSSourceInfo(u64 v_o, u64 s, u64 offset, RomFSDataSource t) : virtual_offset(v_o), size(s), type(t) {
switch (this->type) {
case RomFSDataSource::BaseRomFS:
this->base_source_info.offset = offset;
break;
case RomFSDataSource::FileRomFS:
this->file_source_info.offset = offset;
break;
case RomFSDataSource::LooseFile:
case RomFSDataSource::MetaData:
case RomFSDataSource::Memory:
default:
/* TODO: Better error. */
fatalSimple(ResultKernelConnectionClosed);
break;
}
}
RomFSSourceInfo(u64 v_o, u64 s, const void *arg, RomFSDataSource t) : virtual_offset(v_o), size(s), type(t) {
switch (this->type) {
case RomFSDataSource::LooseFile:
this->loose_source_info.path = (decltype(this->loose_source_info.path))arg;
break;
case RomFSDataSource::Memory:
this->memory_source_info.data = (decltype(this->memory_source_info.data))arg;
break;
case RomFSDataSource::MetaData:
case RomFSDataSource::BaseRomFS:
case RomFSDataSource::FileRomFS:
default:
/* TODO: Better error. */
fatalSimple(ResultKernelConnectionClosed);
break;
}
}
RomFSSourceInfo(u64 v_o, u64 s, RomFSDataSource t) : virtual_offset(v_o), size(s), type(t) {
switch (this->type) {
case RomFSDataSource::MetaData:
break;
case RomFSDataSource::LooseFile:
case RomFSDataSource::Memory:
case RomFSDataSource::BaseRomFS:
case RomFSDataSource::FileRomFS:
default:
/* TODO: Better error. */
fatalSimple(ResultKernelConnectionClosed);
break;
}
}
void Cleanup() {
switch (this->type) {
case RomFSDataSource::BaseRomFS:
case RomFSDataSource::FileRomFS:
case RomFSDataSource::MetaData:
break;
case RomFSDataSource::LooseFile:
delete[] this->loose_source_info.path;
break;
case RomFSDataSource::Memory:
std::free((void*)this->memory_source_info.data);
break;
default:
/* TODO: Better error. */
fatalSimple(ResultKernelConnectionClosed);
break;
}
}
static bool Compare(RomFSSourceInfo *a, RomFSSourceInfo *b) {
return (a->virtual_offset < b->virtual_offset);
}
};
/* Types for building a RomFS. */
struct RomFSHeader {
u64 header_size;
u64 dir_hash_table_ofs;
u64 dir_hash_table_size;
u64 dir_table_ofs;
u64 dir_table_size;
u64 file_hash_table_ofs;
u64 file_hash_table_size;
u64 file_table_ofs;
u64 file_table_size;
u64 file_partition_ofs;
};
static_assert(sizeof(RomFSHeader) == 0x50, "Incorrect RomFS Header definition!");
struct RomFSDirectoryEntry {
u32 parent;
u32 sibling;
u32 child;
u32 file;
u32 hash;
u32 name_size;
char name[];
};
static_assert(sizeof(RomFSDirectoryEntry) == 0x18, "Incorrect RomFSDirectoryEntry definition!");
struct RomFSFileEntry {
u32 parent;
u32 sibling;
u64 offset;
u64 size;
u32 hash;
u32 name_size;
char name[];
};
static_assert(sizeof(RomFSFileEntry) == 0x20, "Incorrect RomFSFileEntry definition!");
struct RomFSBuildFileContext;
/* Used as comparator for std::map<char *, RomFSBuild*Context> */
struct build_ctx_cmp {
bool operator()(const char *a, const char *b) const {
return strcmp(a, b) < 0;
}
};
struct RomFSBuildDirectoryContext {
char *path;
u32 cur_path_ofs;
u32 path_len;
u32 entry_offset = 0;
RomFSBuildDirectoryContext *parent = NULL;
RomFSBuildDirectoryContext *child = NULL;
RomFSBuildDirectoryContext *sibling = NULL;
RomFSBuildFileContext *file = NULL;
};
struct RomFSBuildFileContext {
char *path;
u32 cur_path_ofs;
u32 path_len;
u32 entry_offset = 0;
u64 offset = 0;
u64 size = 0;
RomFSBuildDirectoryContext *parent = NULL;
RomFSBuildFileContext *sibling = NULL;
RomFSDataSource source{0};
u64 orig_offset = 0;
};
class RomFSBuildContext {
private:
u64 title_id;
RomFSBuildDirectoryContext *root;
std::map<char *, RomFSBuildDirectoryContext *, build_ctx_cmp> directories;
std::map<char *, RomFSBuildFileContext *, build_ctx_cmp> files;
u64 num_dirs = 0;
u64 num_files = 0;
u64 dir_table_size = 0;
u64 file_table_size = 0;
u64 dir_hash_table_size = 0;
u64 file_hash_table_size = 0;
u64 file_partition_size = 0;
FsDirectoryEntry dir_entry;
RomFSDataSource cur_source_type;
void VisitDirectory(FsFileSystem *filesys, RomFSBuildDirectoryContext *parent);
void VisitDirectory(RomFSBuildDirectoryContext *parent, u32 parent_offset, void *dir_table, size_t dir_table_size, void *file_table, size_t file_table_size);
bool AddDirectory(RomFSBuildDirectoryContext *parent_dir_ctx, RomFSBuildDirectoryContext *dir_ctx, RomFSBuildDirectoryContext **out_dir_ctx);
bool AddFile(RomFSBuildDirectoryContext *parent_dir_ctx, RomFSBuildFileContext *file_ctx);
public:
RomFSBuildContext(u64 tid) : title_id(tid) {
this->root = new RomFSBuildDirectoryContext({0});
this->root->path = new char[1];
this->root->path[0] = '\x00';
this->directories.insert({this->root->path, this->root});
this->num_dirs = 1;
this->dir_table_size = 0x18;
}
void MergeSdFiles();
void MergeRomStorage(IROStorage *storage, RomFSDataSource source);
/* This finalizes the context. */
void Build(std::vector<RomFSSourceInfo> *out_infos);
};
static inline RomFSDirectoryEntry *romfs_get_direntry(void *directories, uint32_t offset) {
return (RomFSDirectoryEntry *)((uintptr_t)directories + offset);
}
static inline RomFSFileEntry *romfs_get_fentry(void *files, uint32_t offset) {
return (RomFSFileEntry *)((uintptr_t)files + offset);
}
static inline uint32_t romfs_calc_path_hash(uint32_t parent, const unsigned char *path, uint32_t start, size_t path_len) {
uint32_t hash = parent ^ 123456789;
for (uint32_t i = 0; i < path_len; i++) {
hash = (hash >> 5) | (hash << 27);
hash ^= path[start + i];
}
return hash;
}
static inline uint32_t romfs_get_hash_table_count(uint32_t num_entries) {
if (num_entries < 3) {
return 3;
} else if (num_entries < 19) {
return num_entries | 1;
}
uint32_t count = num_entries;
while (count % 2 == 0 || count % 3 == 0 || count % 5 == 0 || count % 7 == 0 || count % 11 == 0 || count % 13 == 0 || count % 17 == 0) {
count++;
}
return count;
}