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Atmosphere/stratosphere/fs_mitm/source/fsmitm_romfsbuild.hpp
Tony Wasserka ad636f7216 Modernize C++ usage (#144)
* Stratosphere: Use modern C++ idioms in some places

* algorithms like std::for_each are used instead of raw loops

* Stratosphere: Replace more raw loops with algorithms

* Stratosphere: Add a utility predicate function to test for equality with a reference element

This can be used to rewrite some common raw loops using algorithms instead

* fs.mitm: Use variant

* fs.mitm: Use enum class

* fs.mitm: Turn RomFSSourceInfo::Cleanup into a destructor

This obsoletes the need for a custom deleter in other places

* fs.mitm: Use enum class some more

* fs.mitm: Use unique_ptr

* fs.mitm: Simplify initialization

* Stratosphere: Simplify initialization

* fs.mitm: Use unique_ptr (fix memory leak along the way)

The previous code was using "delete" rather than "delete[]"

* fs.mitm: Use vector::emplace_back rather than push_back

emplace_back constructs elements in-place, hence avoiding a redundant element copy.

* Stratosphere: Replace more raw loops with algorithms

* Stratosphere: Use unique_ptr

* fs.mitm: Replace more raw loops with algorithms

* Stratosphere: Prefer move-construction over copy-construction when moving sink parameters around
2018-06-19 11:07:31 -07:00

255 lines
7.1 KiB
C++

#pragma once
#include <switch.h>
#include <variant>
#include "fsmitm_romstorage.hpp"
#define ROMFS_ENTRY_EMPTY 0xFFFFFFFF
#define ROMFS_FILEPARTITION_OFS 0x200
/* Types for RomFS Meta construction. */
enum class RomFSDataSource {
BaseRomFS,
FileRomFS,
LooseFile,
Memory,
};
struct RomFSBaseSourceInfo {
u64 offset;
};
struct RomFSFileSourceInfo {
u64 offset;
};
struct RomFSLooseSourceInfo {
const char *path;
};
struct RomFSMemorySourceInfo {
const u8 *data;
};
class RomFSSourceInfo {
using InfoVariant = std::variant<RomFSBaseSourceInfo, RomFSFileSourceInfo, RomFSLooseSourceInfo, RomFSMemorySourceInfo>;
static InfoVariant MakeInfoVariantFromOffset(u64 offset, RomFSDataSource t) {
switch(t) {
case RomFSDataSource::BaseRomFS:
return RomFSBaseSourceInfo { offset };
case RomFSDataSource::FileRomFS:
return RomFSFileSourceInfo { offset };
default:
fatalSimple(0xF601);
}
}
static InfoVariant MakeInfoVariantFromPointer(const void *arg, RomFSDataSource t) {
switch(t) {
case RomFSDataSource::LooseFile:
return RomFSLooseSourceInfo { (decltype(RomFSLooseSourceInfo::path))arg };
case RomFSDataSource::Memory:
return RomFSMemorySourceInfo { (decltype(RomFSMemorySourceInfo::data))arg };
default:
fatalSimple(0xF601);
}
}
struct InfoCleanupHelper {
void operator()(RomFSBaseSourceInfo& info) {
}
void operator()(RomFSFileSourceInfo& info) {
}
void operator()(RomFSLooseSourceInfo& info) {
delete info.path;
}
void operator()(RomFSMemorySourceInfo& info) {
delete info.data;
}
};
struct GetTypeHelper {
RomFSDataSource operator()(const RomFSBaseSourceInfo& info) const {
return RomFSDataSource::BaseRomFS;
}
RomFSDataSource operator()(const RomFSFileSourceInfo& info) const {
return RomFSDataSource::FileRomFS;
}
RomFSDataSource operator()(const RomFSLooseSourceInfo& info) const {
return RomFSDataSource::LooseFile;
}
RomFSDataSource operator()(const RomFSMemorySourceInfo& info) const {
return RomFSDataSource::Memory;
}
};
public:
u64 virtual_offset;
u64 size;
InfoVariant info;
RomFSSourceInfo(u64 v_o, u64 s, u64 offset, RomFSDataSource t) : virtual_offset(v_o), size(s), info(MakeInfoVariantFromOffset(offset, t)) {
}
RomFSSourceInfo(u64 v_o, u64 s, const void *arg, RomFSDataSource t) : virtual_offset(v_o), size(s), info(MakeInfoVariantFromPointer(arg, t)) {
}
~RomFSSourceInfo() {
std::visit(InfoCleanupHelper{}, info);
}
static bool Compare(RomFSSourceInfo *a, RomFSSourceInfo *b) {
return (a->virtual_offset < b->virtual_offset);
}
RomFSDataSource GetType() const {
return std::visit(GetTypeHelper{}, info);
}
};
/* 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;
struct RomFSBuildDirectoryContext {
char path[FS_MAX_PATH];
u32 cur_path_ofs;
u32 path_len;
u32 entry_offset;
RomFSBuildDirectoryContext *parent;
RomFSBuildDirectoryContext *child;
RomFSBuildDirectoryContext *sibling;
RomFSBuildFileContext *file;
RomFSBuildDirectoryContext *next;
};
struct RomFSBuildFileContext {
char path[FS_MAX_PATH];
u32 cur_path_ofs;
u32 path_len;
u32 entry_offset;
u64 offset;
u64 size;
RomFSBuildDirectoryContext *parent;
RomFSBuildFileContext *sibling;
RomFSBuildFileContext *next;
RomFSDataSource source;
u64 orig_offset;
};
class RomFSBuildContext {
private:
u64 title_id;
RomFSBuildDirectoryContext *root;
RomFSBuildFileContext *files;
u64 num_dirs;
u64 num_files;
u64 dir_table_size;
u64 file_table_size;
u64 dir_hash_table_size;
u64 file_hash_table_size;
u64 file_partition_size;
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), root(NULL), files(NULL), num_dirs(0), num_files(0), dir_table_size(0), file_table_size(0), dir_hash_table_size(0), file_hash_table_size(0), file_partition_size(0) {
this->root = new RomFSBuildDirectoryContext({0});
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;
}