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Atmosphere/stratosphere/fs_mitm/source/fsmitm_romfsbuild.cpp

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/*
* 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/>.
*/
#include <switch.h>
#include <string.h>
#include <stratosphere.hpp>
#include "fsmitm_utils.hpp"
#include "fsmitm_romfsbuild.hpp"
#include "debug.hpp"
void RomFSBuildContext::VisitDirectory(FsFileSystem *filesys, RomFSBuildDirectoryContext *parent) {
FsDir dir;
Result rc;
std::vector<RomFSBuildDirectoryContext *> child_dirs;
/* Open the current parent directory. */
if (R_FAILED((rc = Utils::OpenRomFSDir(filesys, this->title_id, parent->path, &dir)))) {
fatalSimple(rc);
}
u64 read_entries;
while (R_SUCCEEDED((rc = fsDirRead(&dir, 0, &read_entries, 1, &this->dir_entry))) && read_entries == 1) {
if (this->dir_entry.type == ENTRYTYPE_DIR) {
RomFSBuildDirectoryContext *child = new RomFSBuildDirectoryContext({0});
/* Set child's path. */
child->cur_path_ofs = parent->path_len + 1;
child->path_len = child->cur_path_ofs + strlen(this->dir_entry.name);
child->path = new char[child->path_len + 1];
strcpy(child->path, parent->path);
if (child->path_len > FS_MAX_PATH - 1) {
fatalSimple(0xF601);
}
strcat(child->path + parent->path_len, "/");
strcat(child->path + parent->path_len, this->dir_entry.name);
if (!this->AddDirectory(parent, child, NULL)) {
delete child->path;
delete child;
} else {
child_dirs.push_back(child);
}
} else if (this->dir_entry.type == ENTRYTYPE_FILE) {
RomFSBuildFileContext *child = new RomFSBuildFileContext({0});
/* Set child's path. */
child->cur_path_ofs = parent->path_len + 1;
child->path_len = child->cur_path_ofs + strlen(this->dir_entry.name);
child->path = new char[child->path_len + 1];
strcpy(child->path, parent->path);
if (child->path_len > FS_MAX_PATH - 1) {
fatalSimple(0xF601);
}
strcat(child->path + parent->path_len, "/");
strcat(child->path + parent->path_len, this->dir_entry.name);
child->source = this->cur_source_type;
child->size = this->dir_entry.fileSize;
if (!this->AddFile(parent, child)) {
delete child->path;
delete child;
}
} else {
fatalSimple(rc);
}
}
fsDirClose(&dir);
for (auto &child : child_dirs) {
this->VisitDirectory(filesys, child);
}
}
void RomFSBuildContext::MergeSdFiles() {
FsFileSystem sd_filesystem;
FsDir dir;
if (!Utils::IsSdInitialized()) {
return;
}
if (R_FAILED((Utils::OpenSdDirForAtmosphere(this->title_id, "/romfs", &dir)))) {
return;
}
fsDirClose(&dir);
if (R_FAILED(fsMountSdcard(&sd_filesystem))) {
return;
}
this->cur_source_type = RomFSDataSource::LooseFile;
this->VisitDirectory(&sd_filesystem, this->root);
fsFsClose(&sd_filesystem);
}
void RomFSBuildContext::VisitDirectory(RomFSBuildDirectoryContext *parent, u32 parent_offset, void *dir_table, size_t dir_table_size, void *file_table, size_t file_table_size) {
RomFSDirectoryEntry *parent_entry = romfs_get_direntry(dir_table, parent_offset);
if (parent_entry->file != ROMFS_ENTRY_EMPTY) {
RomFSFileEntry *cur_file = romfs_get_fentry(file_table, parent_entry->file);
while (cur_file != NULL) {
RomFSBuildFileContext *child = new RomFSBuildFileContext({0});
/* Set child's path. */
child->cur_path_ofs = parent->path_len + 1;
child->path_len = child->cur_path_ofs + cur_file->name_size;
child->path = new char[child->path_len + 1];
strcpy(child->path, parent->path);
if (child->path_len > FS_MAX_PATH - 1) {
fatalSimple(0xF601);
}
strcat(child->path + parent->path_len, "/");
strncat(child->path + parent->path_len, cur_file->name, cur_file->name_size);
child->size = cur_file->size;
child->source = this->cur_source_type;
child->orig_offset = cur_file->offset;
if (!this->AddFile(parent, child)) {
delete child->path;
delete child;
}
if (cur_file->sibling == ROMFS_ENTRY_EMPTY) {
cur_file = NULL;
} else {
cur_file = romfs_get_fentry(file_table, cur_file->sibling);
}
}
}
if (parent_entry->child != ROMFS_ENTRY_EMPTY) {
RomFSDirectoryEntry *cur_child = romfs_get_direntry(dir_table, parent_entry->child);
u32 cur_child_offset = parent_entry->child;
while (cur_child != NULL) {
RomFSBuildDirectoryContext *child = new RomFSBuildDirectoryContext({0});
/* Set child's path. */
child->cur_path_ofs = parent->path_len + 1;
child->path_len = child->cur_path_ofs + cur_child->name_size;
child->path = new char[child->path_len + 1];
strcpy(child->path, parent->path);
if (child->path_len > FS_MAX_PATH - 1) {
fatalSimple(0xF601);
}
strcat(child->path + parent->path_len, "/");
strncat(child->path + parent->path_len, cur_child->name, cur_child->name_size);
RomFSBuildDirectoryContext *real = NULL;
if (!this->AddDirectory(parent, child, &real)) {
delete child->path;
delete child;
}
if (real == NULL) {
fatalSimple(0xF601);
}
this->VisitDirectory(real, cur_child_offset, dir_table, dir_table_size, file_table, file_table_size);
if (cur_child->sibling == ROMFS_ENTRY_EMPTY) {
cur_child = NULL;
} else {
cur_child_offset = cur_child->sibling;
cur_child = romfs_get_direntry(dir_table, cur_child->sibling);
}
}
}
}
void RomFSBuildContext::MergeRomStorage(IROStorage *storage, RomFSDataSource source) {
Result rc;
RomFSHeader header;
if (R_FAILED((rc = storage->Read(&header, sizeof(header), 0)))) {
fatalSimple(rc);
}
if (header.header_size != sizeof(header)) {
/* what */
return;
}
/* Read tables. */
auto dir_table = std::make_unique<u8[]>(header.dir_table_size);
auto file_table = std::make_unique<u8[]>(header.file_table_size);
if (R_FAILED((rc = storage->Read(dir_table.get(), header.dir_table_size, header.dir_table_ofs)))) {
fatalSimple(rc);
}
if (R_FAILED((rc = storage->Read(file_table.get(), header.file_table_size, header.file_table_ofs)))) {
fatalSimple(rc);
}
this->cur_source_type = source;
this->VisitDirectory(this->root, 0x0, dir_table.get(), (size_t)header.dir_table_size, file_table.get(), (size_t)header.file_table_size);
}
bool RomFSBuildContext::AddDirectory(RomFSBuildDirectoryContext *parent_dir_ctx, RomFSBuildDirectoryContext *dir_ctx, RomFSBuildDirectoryContext **out_dir_ctx) {
/* Check whether it's already in the known directories. */
auto existing = this->directories.find(dir_ctx->path);
if (existing != this->directories.end()) {
if (out_dir_ctx) {
*out_dir_ctx = existing->second;
}
return false;
}
/* Add a new directory. */
this->num_dirs++;
this->dir_table_size += sizeof(RomFSDirectoryEntry) + ((dir_ctx->path_len - dir_ctx->cur_path_ofs + 3) & ~3);
dir_ctx->parent = parent_dir_ctx;
this->directories.insert({dir_ctx->path, dir_ctx});
if (out_dir_ctx) {
*out_dir_ctx = dir_ctx;
}
return true;
}
bool RomFSBuildContext::AddFile(RomFSBuildDirectoryContext *parent_dir_ctx, RomFSBuildFileContext *file_ctx) {
/* Check whether it's already in the known files. */
auto existing = this->files.find(file_ctx->path);
if (existing != this->files.end()) {
return false;
}
/* Add a new file. */
this->num_files++;
this->file_table_size += sizeof(RomFSFileEntry) + ((file_ctx->path_len - file_ctx->cur_path_ofs + 3) & ~3);
file_ctx->parent = parent_dir_ctx;
this->files.insert({file_ctx->path, file_ctx});
return true;
}
void RomFSBuildContext::Build(std::vector<RomFSSourceInfo> *out_infos) {
RomFSBuildFileContext *cur_file;
RomFSBuildDirectoryContext *cur_dir;
u32 entry_offset;
u32 dir_hash_table_entry_count = romfs_get_hash_table_count(this->num_dirs);
u32 file_hash_table_entry_count = romfs_get_hash_table_count(this->num_files);
this->dir_hash_table_size = 4 * dir_hash_table_entry_count;
this->file_hash_table_size = 4 * file_hash_table_entry_count;
/* Assign metadata pointers */
RomFSHeader *header = new RomFSHeader({0});
u8 *metadata = new u8[this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size + this->file_table_size];
u32 *dir_hash_table = (u32 *)((uintptr_t)metadata);
RomFSDirectoryEntry *dir_table = (RomFSDirectoryEntry *)((uintptr_t)dir_hash_table + this->dir_hash_table_size);
u32 *file_hash_table = (u32 *)((uintptr_t)dir_table + this->dir_table_size);
RomFSFileEntry *file_table = (RomFSFileEntry *)((uintptr_t)file_hash_table + this->file_hash_table_size);
/* Clear out hash tables. */
for (u32 i = 0; i < dir_hash_table_entry_count; i++) {
dir_hash_table[i] = ROMFS_ENTRY_EMPTY;
}
for (u32 i = 0; i < file_hash_table_entry_count; i++) {
file_hash_table[i] = ROMFS_ENTRY_EMPTY;
}
out_infos->clear();
out_infos->emplace_back(0, sizeof(*header), header, RomFSDataSource::Memory);
/* Determine file offsets. */
entry_offset = 0;
RomFSBuildFileContext *prev_file = NULL;
for (const auto &it : this->files) {
cur_file = it.second;
this->file_partition_size = (this->file_partition_size + 0xFULL) & ~0xFULL;
/* Check for extra padding in the original romfs source and preserve it, to help ourselves later. */
if (prev_file && prev_file->source == cur_file->source && (prev_file->source == RomFSDataSource::BaseRomFS || prev_file->source == RomFSDataSource::FileRomFS)) {
u64 expected = (this->file_partition_size - prev_file->offset + prev_file->orig_offset);
if (expected != cur_file->orig_offset) {
if (expected > cur_file->orig_offset) {
/* This case should NEVER happen. */
fatalSimple(0xF601);
}
this->file_partition_size += cur_file->orig_offset - expected;
}
}
cur_file->offset = this->file_partition_size;
this->file_partition_size += cur_file->size;
cur_file->entry_offset = entry_offset;
entry_offset += sizeof(RomFSFileEntry) + ((cur_file->path_len - cur_file->cur_path_ofs + 3) & ~3);
prev_file = cur_file;
}
/* Assign deferred parent/sibling ownership. */
for (auto it = this->files.rbegin(); it != this->files.rend(); it++) {
cur_file = it->second;
cur_file->sibling = cur_file->parent->file;
cur_file->parent->file = cur_file;
}
/* Determine directory offsets. */
entry_offset = 0;
for (const auto &it : this->directories) {
cur_dir = it.second;
cur_dir->entry_offset = entry_offset;
entry_offset += sizeof(RomFSDirectoryEntry) + ((cur_dir->path_len - cur_dir->cur_path_ofs + 3) & ~3);
}
/* Assign deferred parent/sibling ownership. */
for (auto it = this->directories.rbegin(); it->second != this->root; it++) {
cur_dir = it->second;
cur_dir->sibling = cur_dir->parent->child;
cur_dir->parent->child = cur_dir;
}
/* Populate file tables. */
for (const auto &it : this->files) {
cur_file = it.second;
RomFSFileEntry *cur_entry = romfs_get_fentry(file_table, cur_file->entry_offset);
cur_entry->parent = cur_file->parent->entry_offset;
cur_entry->sibling = (cur_file->sibling == NULL) ? ROMFS_ENTRY_EMPTY : cur_file->sibling->entry_offset;
cur_entry->offset = cur_file->offset;
cur_entry->size = cur_file->size;
u32 name_size = cur_file->path_len - cur_file->cur_path_ofs;
u32 hash = romfs_calc_path_hash(cur_file->parent->entry_offset, (unsigned char *)cur_file->path + cur_file->cur_path_ofs, 0, name_size);
cur_entry->hash = file_hash_table[hash % file_hash_table_entry_count];
file_hash_table[hash % file_hash_table_entry_count] = cur_file->entry_offset;
cur_entry->name_size = name_size;
memset(cur_entry->name, 0, (cur_entry->name_size + 3) & ~3);
memcpy(cur_entry->name, cur_file->path + cur_file->cur_path_ofs, name_size);
switch (cur_file->source) {
case RomFSDataSource::BaseRomFS:
case RomFSDataSource::FileRomFS:
/* Try to compact, if possible. */
if (out_infos->back().type == cur_file->source) {
out_infos->back().size = cur_file->offset + ROMFS_FILEPARTITION_OFS + cur_file->size - out_infos->back().virtual_offset;
} else {
out_infos->emplace_back(cur_file->offset + ROMFS_FILEPARTITION_OFS, cur_file->size, cur_file->orig_offset + ROMFS_FILEPARTITION_OFS, cur_file->source);
}
break;
case RomFSDataSource::LooseFile:
{
char *path = new char[cur_file->path_len + 1];
strcpy(path, cur_file->path);
out_infos->emplace_back(cur_file->offset + ROMFS_FILEPARTITION_OFS, cur_file->size, path, cur_file->source);
}
break;
default:
fatalSimple(0xF601);
}
}
/* Populate dir tables. */
for (const auto &it : this->directories) {
cur_dir = it.second;
RomFSDirectoryEntry *cur_entry = romfs_get_direntry(dir_table, cur_dir->entry_offset);
cur_entry->parent = cur_dir == this->root ? 0 : cur_dir->parent->entry_offset;
cur_entry->sibling = (cur_dir->sibling == NULL) ? ROMFS_ENTRY_EMPTY : cur_dir->sibling->entry_offset;
cur_entry->child = (cur_dir->child == NULL) ? ROMFS_ENTRY_EMPTY : cur_dir->child->entry_offset;
cur_entry->file = (cur_dir->file == NULL) ? ROMFS_ENTRY_EMPTY : cur_dir->file->entry_offset;
u32 name_size = cur_dir->path_len - cur_dir->cur_path_ofs;
u32 hash = romfs_calc_path_hash(cur_dir == this->root ? 0 : cur_dir->parent->entry_offset, (unsigned char *)cur_dir->path + cur_dir->cur_path_ofs, 0, name_size);
cur_entry->hash = dir_hash_table[hash % dir_hash_table_entry_count];
dir_hash_table[hash % dir_hash_table_entry_count] = cur_dir->entry_offset;
cur_entry->name_size = name_size;
memset(cur_entry->name, 0, (cur_entry->name_size + 3) & ~3);
memcpy(cur_entry->name, cur_dir->path + cur_dir->cur_path_ofs, name_size);
}
/* Delete directories. */
for (const auto &it : this->directories) {
cur_dir = it.second;
delete cur_dir->path;
delete cur_dir;
}
this->root = NULL;
this->directories.clear();
/* Delete files. */
for (const auto &it : this->files) {
cur_file = it.second;
delete cur_file->path;
delete cur_file;
}
this->files.clear();
/* Set header fields. */
header->header_size = sizeof(*header);
header->file_hash_table_size = this->file_hash_table_size;
header->file_table_size = this->file_table_size;
header->dir_hash_table_size = this->dir_hash_table_size;
header->dir_table_size = this->dir_table_size;
header->file_partition_ofs = ROMFS_FILEPARTITION_OFS;
header->dir_hash_table_ofs = (header->file_partition_ofs + this->file_partition_size + 3ULL) & ~3ULL;
header->dir_table_ofs = header->dir_hash_table_ofs + header->dir_hash_table_size;
header->file_hash_table_ofs = header->dir_table_ofs + header->dir_table_size;
header->file_table_ofs = header->file_hash_table_ofs + header->file_hash_table_size;
/* For debugging, uncomment this to get a log of the generated metadata tables. */
/*
{
FsFileSystem sd_fs;
if (R_SUCCEEDED(fsMountSdcard(&sd_fs))) {
FsFile f;
fsFsCreateFile(&sd_fs, "/METADATALOG.bin", this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size + this->file_table_size + sizeof(*header), 0);
if (R_SUCCEEDED(fsFsOpenFile(&sd_fs, "/METADATALOG.bin", FS_OPEN_READ | FS_OPEN_WRITE, &f))) {
fsFileSetSize(&f, this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size + this->file_table_size + sizeof(*header));
fsFileWrite(&f, 0, header, sizeof(*header));
fsFileWrite(&f, sizeof(*header), metadata, this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size + this->file_table_size);
fsFileClose(&f);
}
fsFsClose(&sd_fs);
}
}
*/
out_infos->emplace_back(header->dir_hash_table_ofs, this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size + this->file_table_size, metadata, RomFSDataSource::Memory);
}
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