file_sys: Port Atmosphere-NX fs_mitm implementation
This commit is contained in:
Zach Hilman
parent
940a711caf
commit
6eada3c57d
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@ -0,0 +1,368 @@
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/*
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* Copyright (c) 2018 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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/*
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* Adapted by DarkLordZach for use/interaction with yuzu
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*
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* Modifications Copyright 2018 yuzu emulator team
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* Licensed under GPLv2 or any later version
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* Refer to the license.txt file included.
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*/
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#include <cstring>
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#include "common/assert.h"
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#include "fsmitm_romfsbuild.hpp"
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#include "vfs.h"
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#include "vfs_vector.h"
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namespace FileSys {
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constexpr u64 FS_MAX_PATH = 0x301;
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constexpr u32 ROMFS_ENTRY_EMPTY = 0xFFFFFFFF;
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constexpr u32 ROMFS_FILEPARTITION_OFS = 0x200;
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/* Types for building a RomFS. */
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struct RomFSHeader {
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u64 header_size;
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u64 dir_hash_table_ofs;
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u64 dir_hash_table_size;
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u64 dir_table_ofs;
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u64 dir_table_size;
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u64 file_hash_table_ofs;
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u64 file_hash_table_size;
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u64 file_table_ofs;
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u64 file_table_size;
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u64 file_partition_ofs;
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};
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static_assert(sizeof(RomFSHeader) == 0x50, "RomFSHeader has incorrect size.");
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struct RomFSDirectoryEntry {
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u32 parent;
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u32 sibling;
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u32 child;
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u32 file;
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u32 hash;
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u32 name_size;
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char name[];
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};
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static_assert(sizeof(RomFSDirectoryEntry) == 0x18, "RomFSDirectoryEntry has incorrect size.");
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struct RomFSFileEntry {
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u32 parent;
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u32 sibling;
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u64 offset;
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u64 size;
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u32 hash;
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u32 name_size;
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char name[];
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};
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static_assert(sizeof(RomFSFileEntry) == 0x20, "RomFSFileEntry has incorrect size.");
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struct RomFSBuildFileContext;
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struct RomFSBuildDirectoryContext {
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char* path;
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u32 cur_path_ofs;
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u32 path_len;
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u32 entry_offset = 0;
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RomFSBuildDirectoryContext* parent = nullptr;
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RomFSBuildDirectoryContext* child = nullptr;
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RomFSBuildDirectoryContext* sibling = nullptr;
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RomFSBuildFileContext* file = nullptr;
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};
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struct RomFSBuildFileContext {
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char* path;
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u32 cur_path_ofs;
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u32 path_len;
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u32 entry_offset = 0;
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u64 offset = 0;
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u64 size = 0;
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RomFSBuildDirectoryContext* parent = nullptr;
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RomFSBuildFileContext* sibling = nullptr;
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VirtualFile source = nullptr;
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};
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void RomFSBuildContext::VisitDirectory(VirtualDir root_romfs, RomFSBuildDirectoryContext* parent) {
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std::vector<RomFSBuildDirectoryContext*> child_dirs;
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VirtualDir dir;
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if (parent->path_len == 0)
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dir = root_romfs;
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else
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dir = root_romfs->GetDirectoryRelative(parent->path);
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const auto entries = dir->GetEntries();
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for (const auto& kv : entries) {
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if (kv.second == VfsEntryType::Directory) {
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RomFSBuildDirectoryContext* child = new RomFSBuildDirectoryContext({0});
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/* Set child's path. */
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child->cur_path_ofs = parent->path_len + 1;
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child->path_len = child->cur_path_ofs + kv.first.size();
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child->path = new char[child->path_len + 1];
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strcpy(child->path, parent->path);
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ASSERT(child->path_len < FS_MAX_PATH);
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strcat(child->path + parent->path_len, "/");
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strcat(child->path + parent->path_len, kv.first.c_str());
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if (!this->AddDirectory(parent, child, nullptr)) {
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delete child->path;
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delete child;
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} else {
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child_dirs.push_back(child);
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}
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} else {
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RomFSBuildFileContext* child = new RomFSBuildFileContext({0});
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/* Set child's path. */
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child->cur_path_ofs = parent->path_len + 1;
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child->path_len = child->cur_path_ofs + kv.first.size();
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child->path = new char[child->path_len + 1];
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strcpy(child->path, parent->path);
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ASSERT(child->path_len < FS_MAX_PATH);
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strcat(child->path + parent->path_len, "/");
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strcat(child->path + parent->path_len, kv.first.c_str());
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child->source = root_romfs->GetFileRelative(child->path);
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child->size = child->source->GetSize();
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if (!this->AddFile(parent, child)) {
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delete child->path;
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delete child;
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}
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}
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}
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for (auto& child : child_dirs) {
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this->VisitDirectory(root_romfs, child);
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}
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}
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bool RomFSBuildContext::AddDirectory(RomFSBuildDirectoryContext* parent_dir_ctx,
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RomFSBuildDirectoryContext* dir_ctx,
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RomFSBuildDirectoryContext** out_dir_ctx) {
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/* Check whether it's already in the known directories. */
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auto existing = this->directories.find(dir_ctx->path);
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if (existing != this->directories.end()) {
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if (out_dir_ctx) {
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*out_dir_ctx = existing->second;
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}
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return false;
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}
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/* Add a new directory. */
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this->num_dirs++;
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this->dir_table_size +=
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sizeof(RomFSDirectoryEntry) + ((dir_ctx->path_len - dir_ctx->cur_path_ofs + 3) & ~3);
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dir_ctx->parent = parent_dir_ctx;
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this->directories.insert({dir_ctx->path, dir_ctx});
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if (out_dir_ctx) {
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*out_dir_ctx = dir_ctx;
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}
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return true;
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}
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bool RomFSBuildContext::AddFile(RomFSBuildDirectoryContext* parent_dir_ctx,
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RomFSBuildFileContext* file_ctx) {
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/* Check whether it's already in the known files. */
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auto existing = this->files.find(file_ctx->path);
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if (existing != this->files.end()) {
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return false;
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}
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/* Add a new file. */
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this->num_files++;
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this->file_table_size +=
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sizeof(RomFSFileEntry) + ((file_ctx->path_len - file_ctx->cur_path_ofs + 3) & ~3);
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file_ctx->parent = parent_dir_ctx;
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this->files.insert({file_ctx->path, file_ctx});
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return true;
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}
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RomFSBuildContext::RomFSBuildContext(VirtualDir base_) : base(std::move(base_)) {
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this->root = new RomFSBuildDirectoryContext({0});
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this->root->path = new char[1];
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this->root->path[0] = '\x00';
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this->directories.insert({this->root->path, this->root});
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this->num_dirs = 1;
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this->dir_table_size = 0x18;
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VisitDirectory(base, this->root);
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}
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std::map<u64, VirtualFile> RomFSBuildContext::Build() {
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std::map<u64, VirtualFile> out;
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RomFSBuildFileContext* cur_file;
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RomFSBuildDirectoryContext* cur_dir;
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const auto dir_hash_table_entry_count = romfs_get_hash_table_count(this->num_dirs);
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const auto file_hash_table_entry_count = romfs_get_hash_table_count(this->num_files);
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this->dir_hash_table_size = 4 * dir_hash_table_entry_count;
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this->file_hash_table_size = 4 * file_hash_table_entry_count;
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/* Assign metadata pointers */
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RomFSHeader* header = new RomFSHeader({0});
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auto metadata = new u8[this->dir_hash_table_size + this->dir_table_size +
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this->file_hash_table_size + this->file_table_size];
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auto dir_hash_table = reinterpret_cast<u32*>(metadata);
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const auto dir_table = reinterpret_cast<RomFSDirectoryEntry*>(
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reinterpret_cast<uintptr_t>(dir_hash_table) + this->dir_hash_table_size);
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auto file_hash_table =
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reinterpret_cast<u32*>(reinterpret_cast<uintptr_t>(dir_table) + this->dir_table_size);
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const auto file_table = reinterpret_cast<RomFSFileEntry*>(
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reinterpret_cast<uintptr_t>(file_hash_table) + this->file_hash_table_size);
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/* Clear out hash tables. */
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for (u32 i = 0; i < dir_hash_table_entry_count; i++)
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dir_hash_table[i] = ROMFS_ENTRY_EMPTY;
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for (u32 i = 0; i < file_hash_table_entry_count; i++)
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file_hash_table[i] = ROMFS_ENTRY_EMPTY;
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out.clear();
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/* Determine file offsets. */
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u32 entry_offset = 0;
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RomFSBuildFileContext* prev_file = nullptr;
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for (const auto& it : this->files) {
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cur_file = it.second;
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this->file_partition_size = (this->file_partition_size + 0xFULL) & ~0xFULL;
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cur_file->offset = this->file_partition_size;
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this->file_partition_size += cur_file->size;
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cur_file->entry_offset = entry_offset;
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entry_offset +=
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sizeof(RomFSFileEntry) + ((cur_file->path_len - cur_file->cur_path_ofs + 3) & ~3);
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prev_file = cur_file;
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}
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/* Assign deferred parent/sibling ownership. */
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for (auto it = this->files.rbegin(); it != this->files.rend(); it++) {
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cur_file = it->second;
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cur_file->sibling = cur_file->parent->file;
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cur_file->parent->file = cur_file;
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}
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/* Determine directory offsets. */
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entry_offset = 0;
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for (const auto& it : this->directories) {
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cur_dir = it.second;
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cur_dir->entry_offset = entry_offset;
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entry_offset +=
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sizeof(RomFSDirectoryEntry) + ((cur_dir->path_len - cur_dir->cur_path_ofs + 3) & ~3);
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}
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/* Assign deferred parent/sibling ownership. */
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for (auto it = this->directories.rbegin(); it->second != this->root; it++) {
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cur_dir = it->second;
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cur_dir->sibling = cur_dir->parent->child;
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cur_dir->parent->child = cur_dir;
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}
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/* Populate file tables. */
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for (const auto& it : this->files) {
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cur_file = it.second;
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RomFSFileEntry* cur_entry = romfs_get_fentry(file_table, cur_file->entry_offset);
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cur_entry->parent = cur_file->parent->entry_offset;
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cur_entry->sibling =
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(cur_file->sibling == nullptr) ? ROMFS_ENTRY_EMPTY : cur_file->sibling->entry_offset;
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cur_entry->offset = cur_file->offset;
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cur_entry->size = cur_file->size;
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const auto name_size = cur_file->path_len - cur_file->cur_path_ofs;
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const auto hash = romfs_calc_path_hash(cur_file->parent->entry_offset,
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reinterpret_cast<unsigned char*>(cur_file->path) +
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cur_file->cur_path_ofs,
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0, name_size);
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cur_entry->hash = file_hash_table[hash % file_hash_table_entry_count];
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file_hash_table[hash % file_hash_table_entry_count] = cur_file->entry_offset;
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cur_entry->name_size = name_size;
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memset(cur_entry->name, 0, (cur_entry->name_size + 3) & ~3);
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memcpy(cur_entry->name, cur_file->path + cur_file->cur_path_ofs, name_size);
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out.emplace(cur_file->offset + ROMFS_FILEPARTITION_OFS, cur_file->source);
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}
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/* Populate dir tables. */
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for (const auto& it : this->directories) {
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cur_dir = it.second;
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RomFSDirectoryEntry* cur_entry = romfs_get_direntry(dir_table, cur_dir->entry_offset);
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cur_entry->parent = cur_dir == this->root ? 0 : cur_dir->parent->entry_offset;
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cur_entry->sibling =
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(cur_dir->sibling == nullptr) ? ROMFS_ENTRY_EMPTY : cur_dir->sibling->entry_offset;
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cur_entry->child =
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(cur_dir->child == nullptr) ? ROMFS_ENTRY_EMPTY : cur_dir->child->entry_offset;
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cur_entry->file =
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(cur_dir->file == nullptr) ? ROMFS_ENTRY_EMPTY : cur_dir->file->entry_offset;
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u32 name_size = cur_dir->path_len - cur_dir->cur_path_ofs;
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u32 hash = romfs_calc_path_hash(
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cur_dir == this->root ? 0 : cur_dir->parent->entry_offset,
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reinterpret_cast<unsigned char*>(cur_dir->path) + cur_dir->cur_path_ofs, 0, name_size);
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cur_entry->hash = dir_hash_table[hash % dir_hash_table_entry_count];
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dir_hash_table[hash % dir_hash_table_entry_count] = cur_dir->entry_offset;
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cur_entry->name_size = name_size;
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memset(cur_entry->name, 0, (cur_entry->name_size + 3) & ~3);
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memcpy(cur_entry->name, cur_dir->path + cur_dir->cur_path_ofs, name_size);
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}
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/* Delete directories. */
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for (const auto& it : this->directories) {
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cur_dir = it.second;
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delete cur_dir->path;
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delete cur_dir;
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}
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this->root = nullptr;
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this->directories.clear();
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/* Delete files. */
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for (const auto& it : this->files) {
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cur_file = it.second;
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delete cur_file->path;
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delete cur_file;
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}
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this->files.clear();
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/* Set header fields. */
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header->header_size = sizeof(*header);
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header->file_hash_table_size = this->file_hash_table_size;
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header->file_table_size = this->file_table_size;
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header->dir_hash_table_size = this->dir_hash_table_size;
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header->dir_table_size = this->dir_table_size;
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header->file_partition_ofs = ROMFS_FILEPARTITION_OFS;
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header->dir_hash_table_ofs =
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(header->file_partition_ofs + this->file_partition_size + 3ULL) & ~3ULL;
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header->dir_table_ofs = header->dir_hash_table_ofs + header->dir_hash_table_size;
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header->file_hash_table_ofs = header->dir_table_ofs + header->dir_table_size;
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header->file_table_ofs = header->file_hash_table_ofs + header->file_hash_table_size;
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|
||||||
|
std::vector<u8> header_data(sizeof(RomFSHeader));
|
||||||
|
std::memcpy(header_data.data(), header, header_data.size());
|
||||||
|
out.emplace(0, std::make_shared<VectorVfsFile>(header_data));
|
||||||
|
|
||||||
|
std::vector<u8> meta_out(this->file_hash_table_size + this->file_table_size +
|
||||||
|
this->dir_hash_table_size + this->dir_table_size);
|
||||||
|
std::memcpy(meta_out.data(), metadata, meta_out.size());
|
||||||
|
out.emplace(header->dir_hash_table_ofs, std::make_shared<VectorVfsFile>(meta_out));
|
||||||
|
|
||||||
|
return out;
|
||||||
|
}
|
||||||
|
|
||||||
|
} // namespace FileSys
|
||||||
|
|
@ -0,0 +1,106 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2018 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/>.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Adapted by DarkLordZach for use/interaction with yuzu
|
||||||
|
*
|
||||||
|
* Modifications Copyright 2018 yuzu emulator team
|
||||||
|
* Licensed under GPLv2 or any later version
|
||||||
|
* Refer to the license.txt file included.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#pragma once
|
||||||
|
#include <map>
|
||||||
|
#include <boost/detail/container_fwd.hpp>
|
||||||
|
#include "common/common_types.h"
|
||||||
|
#include "vfs.h"
|
||||||
|
|
||||||
|
namespace FileSys {
|
||||||
|
|
||||||
|
/* 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 RomFSDirectoryEntry;
|
||||||
|
struct RomFSFileEntry;
|
||||||
|
struct RomFSBuildDirectoryContext;
|
||||||
|
struct RomFSBuildFileContext;
|
||||||
|
|
||||||
|
class RomFSBuildContext {
|
||||||
|
private:
|
||||||
|
VirtualDir base;
|
||||||
|
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;
|
||||||
|
|
||||||
|
void VisitDirectory(VirtualDir filesys, RomFSBuildDirectoryContext* parent);
|
||||||
|
|
||||||
|
bool AddDirectory(RomFSBuildDirectoryContext* parent_dir_ctx,
|
||||||
|
RomFSBuildDirectoryContext* dir_ctx,
|
||||||
|
RomFSBuildDirectoryContext** out_dir_ctx);
|
||||||
|
bool AddFile(RomFSBuildDirectoryContext* parent_dir_ctx, RomFSBuildFileContext* file_ctx);
|
||||||
|
|
||||||
|
public:
|
||||||
|
explicit RomFSBuildContext(VirtualDir base);
|
||||||
|
|
||||||
|
/* This finalizes the context. */
|
||||||
|
std::map<u64, VirtualFile> Build();
|
||||||
|
};
|
||||||
|
|
||||||
|
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;
|
||||||
|
}
|
||||||
|
|
||||||
|
} // namespace FileSys
|
||||||
Reference in New Issue