mirror of
https://github.com/Atmosphere-NX/Atmosphere
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505 lines
24 KiB
C++
505 lines
24 KiB
C++
/*
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* Copyright (c) 2018-2020 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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#include <stratosphere.hpp>
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#include "../amsmitm_fs_utils.hpp"
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#include "fsmitm_romfs.hpp"
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namespace ams::mitm::fs {
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using namespace ams::fs;
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namespace romfs {
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namespace {
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constexpr u32 EmptyEntry = 0xFFFFFFFF;
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constexpr size_t FilePartitionOffset = 0x200;
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struct Header {
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s64 header_size;
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s64 dir_hash_table_ofs;
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s64 dir_hash_table_size;
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s64 dir_table_ofs;
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s64 dir_table_size;
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s64 file_hash_table_ofs;
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s64 file_hash_table_size;
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s64 file_table_ofs;
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s64 file_table_size;
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s64 file_partition_ofs;
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};
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static_assert(std::is_pod<Header>::value && sizeof(Header) == 0x50);
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struct DirectoryEntry {
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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(std::is_pod<DirectoryEntry>::value && sizeof(DirectoryEntry) == 0x18);
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struct FileEntry {
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u32 parent;
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u32 sibling;
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s64 offset;
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s64 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(std::is_pod<FileEntry>::value && sizeof(FileEntry) == 0x20);
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constexpr inline DirectoryEntry *GetDirectoryEntry(void *dir_table, u32 offset) {
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return reinterpret_cast<DirectoryEntry *>(reinterpret_cast<uintptr_t>(dir_table) + offset);
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}
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constexpr inline FileEntry *GetFileEntry(void *file_table, u32 offset) {
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return reinterpret_cast<FileEntry *>(reinterpret_cast<uintptr_t>(file_table) + offset);
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}
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constexpr inline const DirectoryEntry *GetDirectoryEntry(const void *dir_table, u32 offset) {
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return reinterpret_cast<const DirectoryEntry *>(reinterpret_cast<uintptr_t>(dir_table) + offset);
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}
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constexpr inline const FileEntry *GetFileEntry(const void *file_table, u32 offset) {
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return reinterpret_cast<const FileEntry *>(reinterpret_cast<uintptr_t>(file_table) + offset);
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}
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constexpr inline u32 CalculatePathHash(u32 parent, const char *_path, u32 start, size_t path_len) {
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const unsigned char *path = reinterpret_cast<const unsigned char *>(_path);
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u32 hash = parent ^ 123456789;
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for (size_t i = 0; i < path_len; i++) {
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hash = (hash >> 5) | (hash << 27);
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hash ^= path[start + i];
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}
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return hash;
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}
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constexpr inline size_t GetHashTableSize(size_t num_entries) {
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if (num_entries < 3) {
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return 3;
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} else if (num_entries < 19) {
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return num_entries | 1;
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} else {
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size_t count = num_entries;
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while ((count % 2 == 0) ||
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(count % 3 == 0) ||
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(count % 5 == 0) ||
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(count % 7 == 0) ||
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(count % 11 == 0) ||
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(count % 13 == 0) ||
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(count % 17 == 0))
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{
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count++;
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}
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return count;
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}
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}
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os::Mutex g_fs_romfs_path_lock;
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char g_fs_romfs_path_buffer[fs::EntryNameLengthMax + 1];
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__attribute__((noinline)) void OpenFileSystemRomfsDirectory(FsDir *out, ncm::ProgramId program_id, BuildDirectoryContext *parent, fs::OpenDirectoryMode mode, FsFileSystem *fs) {
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std::scoped_lock lk(g_fs_romfs_path_lock);
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parent->GetPath(g_fs_romfs_path_buffer);
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R_ASSERT(mitm::fs::OpenAtmosphereRomfsDirectory(out, program_id, g_fs_romfs_path_buffer, mode, fs));
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}
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}
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Builder::Builder(ncm::ProgramId pr_id) : program_id(pr_id), 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) {
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auto res = this->directories.emplace(std::make_unique<BuildDirectoryContext>(BuildDirectoryContext::RootTag{}));
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AMS_ASSERT(res.second);
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this->root = res.first->get();
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this->num_dirs = 1;
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this->dir_table_size = 0x18;
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}
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void Builder::AddDirectory(BuildDirectoryContext **out, BuildDirectoryContext *parent_ctx, std::unique_ptr<BuildDirectoryContext> child_ctx) {
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/* Set parent context member. */
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child_ctx->parent = parent_ctx;
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/* Check if the directory already exists. */
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auto existing = this->directories.find(child_ctx);
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if (existing != this->directories.end()) {
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*out = existing->get();
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return;
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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 += sizeof(DirectoryEntry) + util::AlignUp(child_ctx->path_len, 4);
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*out = child_ctx.get();
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this->directories.emplace(std::move(child_ctx));
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}
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void Builder::AddFile(BuildDirectoryContext *parent_ctx, std::unique_ptr<BuildFileContext> file_ctx) {
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/* Set parent context member. */
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file_ctx->parent = parent_ctx;
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/* Check if the file already exists. */
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if (this->files.find(file_ctx) != this->files.end()) {
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return;
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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 += sizeof(FileEntry) + util::AlignUp(file_ctx->path_len, 4);
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this->files.emplace(std::move(file_ctx));
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}
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void Builder::VisitDirectory(FsFileSystem *fs, BuildDirectoryContext *parent) {
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FsDir dir;
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/* Get number of child directories. */
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s64 num_child_dirs = 0;
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{
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OpenFileSystemRomfsDirectory(&dir, this->program_id, parent, OpenDirectoryMode_Directory, fs);
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ON_SCOPE_EXIT { fsDirClose(&dir); };
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R_ASSERT(fsDirGetEntryCount(&dir, &num_child_dirs));
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}
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AMS_ASSERT(num_child_dirs >= 0);
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{
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BuildDirectoryContext **child_dirs = reinterpret_cast<BuildDirectoryContext **>(std::malloc(sizeof(BuildDirectoryContext *) * num_child_dirs));
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ON_SCOPE_EXIT { std::free(child_dirs); };
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AMS_ASSERT(child_dirs != nullptr);
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s64 cur_child_dir_ind = 0;
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{
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OpenFileSystemRomfsDirectory(&dir, this->program_id, parent, OpenDirectoryMode_All, fs);
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ON_SCOPE_EXIT { fsDirClose(&dir); };
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s64 read_entries = 0;
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while (true) {
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R_ASSERT(fsDirRead(&dir, &read_entries, 1, &this->dir_entry));
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if (read_entries != 1) {
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break;
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}
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AMS_ASSERT(this->dir_entry.type == FsDirEntryType_Dir || this->dir_entry.type == FsDirEntryType_File);
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if (this->dir_entry.type == FsDirEntryType_Dir) {
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BuildDirectoryContext *real_child = nullptr;
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this->AddDirectory(&real_child, parent, std::make_unique<BuildDirectoryContext>(this->dir_entry.name, strlen(this->dir_entry.name)));
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AMS_ASSERT(real_child != nullptr);
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child_dirs[cur_child_dir_ind++] = real_child;
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AMS_ASSERT(cur_child_dir_ind <= num_child_dirs);
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} else /* if (this->dir_entry.type == FsDirEntryType_File) */ {
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this->AddFile(parent, std::make_unique<BuildFileContext>(this->dir_entry.name, strlen(this->dir_entry.name), this->dir_entry.file_size, 0, this->cur_source_type));
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}
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}
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}
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AMS_ASSERT(num_child_dirs == cur_child_dir_ind);
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for (s64 i = 0; i < num_child_dirs; i++) {
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this->VisitDirectory(fs, child_dirs[i]);
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}
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}
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}
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void Builder::VisitDirectory(BuildDirectoryContext *parent, u32 parent_offset, const void *dir_table, size_t dir_table_size, const void *file_table, size_t file_table_size) {
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const DirectoryEntry *parent_entry = GetDirectoryEntry(dir_table, parent_offset);
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if (parent_entry->file != EmptyEntry) {
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const FileEntry *cur_file = GetFileEntry(file_table, parent_entry->file);
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while (true) {
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this->AddFile(parent, std::make_unique<BuildFileContext>(cur_file->name, cur_file->name_size, cur_file->size, cur_file->offset, this->cur_source_type));
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if (cur_file->sibling == EmptyEntry) {
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break;
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}
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cur_file = GetFileEntry(file_table, cur_file->sibling);
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}
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}
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if (parent_entry->child != EmptyEntry) {
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const DirectoryEntry *cur_child = GetDirectoryEntry(dir_table, parent_entry->child);
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u32 cur_child_offset = parent_entry->child;
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while (true) {
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BuildDirectoryContext *real_child = nullptr;
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this->AddDirectory(&real_child, parent, std::make_unique<BuildDirectoryContext>(cur_child->name, cur_child->name_size));
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AMS_ASSERT(real_child != nullptr);
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this->VisitDirectory(real_child, cur_child_offset, dir_table, dir_table_size, file_table, file_table_size);
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if (cur_child->sibling == EmptyEntry) {
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break;
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}
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cur_child_offset = cur_child->sibling;
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cur_child = GetDirectoryEntry(dir_table, cur_child_offset);
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}
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}
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}
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void Builder::AddSdFiles() {
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/* Open Sd Card filesystem. */
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FsFileSystem sd_filesystem;
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R_ASSERT(fsOpenSdCardFileSystem(&sd_filesystem));
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ON_SCOPE_EXIT { fsFsClose(&sd_filesystem); };
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/* If there is no romfs folder on the SD, don't bother continuing. */
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{
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FsDir dir;
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if (R_FAILED(mitm::fs::OpenAtmosphereRomfsDirectory(&dir, this->program_id, this->root->path.get(), OpenDirectoryMode_Directory, &sd_filesystem))) {
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return;
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}
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fsDirClose(&dir);
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}
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this->cur_source_type = DataSourceType::LooseSdFile;
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this->VisitDirectory(&sd_filesystem, this->root);
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}
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void Builder::AddStorageFiles(ams::fs::IStorage *storage, DataSourceType source_type) {
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Header header;
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R_ASSERT(storage->Read(0, &header, sizeof(Header)));
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AMS_ASSERT(header.header_size == sizeof(Header));
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/* Read tables. */
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void *tables = std::malloc(header.dir_table_size + header.file_table_size);
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ON_SCOPE_EXIT { std::free(tables); };
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void *dir_table = tables;
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void *file_table = reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(tables) + header.dir_table_size);
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R_ASSERT(storage->Read(header.dir_table_ofs, dir_table, size_t(header.dir_table_size)));
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R_ASSERT(storage->Read(header.file_table_ofs, file_table, size_t(header.file_table_size)));
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this->cur_source_type = source_type;
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this->VisitDirectory(this->root, 0x0, dir_table, size_t(header.dir_table_size), file_table, size_t(header.file_table_size));
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}
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void Builder::Build(std::vector<SourceInfo> *out_infos) {
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/* Clear output. */
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out_infos->clear();
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/* Open an SD card filesystem. */
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FsFileSystem sd_filesystem;
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R_ASSERT(fsOpenSdCardFileSystem(&sd_filesystem));
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ON_SCOPE_EXIT { fsFsClose(&sd_filesystem); };
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/* Calculate hash table sizes. */
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const size_t num_dir_hash_table_entries = GetHashTableSize(this->num_dirs);
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const size_t num_file_hash_table_entries = GetHashTableSize(this->num_files);
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this->dir_hash_table_size = sizeof(u32) * num_dir_hash_table_entries;
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this->file_hash_table_size = sizeof(u32) * num_file_hash_table_entries;
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/* Allocate metadata, make pointers. */
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Header *header = reinterpret_cast<Header *>(std::malloc(sizeof(Header)));
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std::memset(header, 0x00, sizeof(*header));
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/* Open metadata file. */
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const size_t metadata_size = this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size + this->file_table_size;
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FsFile metadata_file;
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R_ASSERT(mitm::fs::CreateAndOpenAtmosphereSdFile(&metadata_file, this->program_id, "romfs_metadata.bin", metadata_size));
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/* Ensure later hash tables will have correct defaults. */
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static_assert(EmptyEntry == 0xFFFFFFFF);
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/* Emplace metadata source info. */
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out_infos->emplace_back(0, sizeof(*header), DataSourceType::Memory, header);
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/* Process Files. */
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{
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u32 entry_offset = 0;
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BuildFileContext *cur_file = nullptr;
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BuildFileContext *prev_file = nullptr;
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for (const auto &it : this->files) {
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cur_file = it.get();
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/* By default, pad to 0x10 alignment. */
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this->file_partition_size = util::AlignUp(this->file_partition_size, 0x10);
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/* Check if extra padding is present in original source, preserve it to make our life easier. */
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const bool is_storage_or_file = cur_file->source_type == DataSourceType::Storage || cur_file->source_type == DataSourceType::File;
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if (prev_file != nullptr && prev_file->source_type == cur_file->source_type && is_storage_or_file) {
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const s64 expected = this->file_partition_size - prev_file->offset + prev_file->orig_offset;
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if (expected != cur_file->orig_offset) {
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AMS_ASSERT(expected <= cur_file->orig_offset);
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this->file_partition_size += cur_file->orig_offset - expected;
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}
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}
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/* Calculate offsets. */
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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 += sizeof(FileEntry) + util::AlignUp(cur_file->path_len, 4);
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/* Save current file as prev for next iteration. */
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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->get();
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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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}
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/* Process Directories. */
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{
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u32 entry_offset = 0;
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BuildDirectoryContext *cur_dir = nullptr;
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for (const auto &it : this->directories) {
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cur_dir = it.get();
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cur_dir->entry_offset = entry_offset;
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entry_offset += sizeof(DirectoryEntry) + util::AlignUp(cur_dir->path_len, 4);
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}
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/* Assign deferred parent/sibling ownership. */
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for (auto it = this->directories.rbegin(); it != this->directories.rend(); it++) {
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cur_dir = it->get();
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if (cur_dir == this->root) {
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continue;
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}
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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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}
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/* Populate file tables. */
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{
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void *ft_buf = std::malloc(this->file_table_size);
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void *fht_buf = std::malloc(this->file_hash_table_size);
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ON_SCOPE_EXIT { std::free(fht_buf); std::free(ft_buf); };
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u32 *file_hash_table = reinterpret_cast<u32 *>(fht_buf);
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FileEntry *file_table = reinterpret_cast<FileEntry *>(ft_buf);
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std::memset(file_hash_table, 0xFF, this->file_hash_table_size);
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for (const auto &it : this->files) {
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BuildFileContext *cur_file = it.get();
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FileEntry *cur_entry = GetFileEntry(file_table, cur_file->entry_offset);
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/* Set entry fields. */
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cur_entry->parent = cur_file->parent->entry_offset;
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cur_entry->sibling = (cur_file->sibling == nullptr) ? EmptyEntry : 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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/* Insert into hash table. */
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const u32 name_size = cur_file->path_len;
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const size_t hash_ind = CalculatePathHash(cur_entry->parent, cur_file->path.get(), 0, name_size) % num_file_hash_table_entries;
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cur_entry->hash = file_hash_table[hash_ind];
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file_hash_table[hash_ind] = cur_file->entry_offset;
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/* Set name. */
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cur_entry->name_size = name_size;
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if (name_size) {
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std::memcpy(cur_entry->name, cur_file->path.get(), name_size);
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for (size_t i = name_size; i < util::AlignUp(name_size, 4); i++) {
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cur_entry->name[i] = 0;
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}
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}
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/* Emplace a source. */
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switch (cur_file->source_type) {
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case DataSourceType::Storage:
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case DataSourceType::File:
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{
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/* Try to compact if possible. */
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auto &back = out_infos->back();
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if (back.source_type == cur_file->source_type) {
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back.size = cur_file->offset + FilePartitionOffset + cur_file->size - back.virtual_offset;
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} else {
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out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, cur_file->orig_offset + FilePartitionOffset);
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}
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}
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break;
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case DataSourceType::LooseSdFile:
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{
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char *new_path = new char[cur_file->GetPathLength() + 1];
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cur_file->GetPath(new_path);
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out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, new_path);
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}
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break;
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AMS_UNREACHABLE_DEFAULT_CASE();
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}
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}
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/* Write to file. */
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R_ASSERT(fsFileWrite(&metadata_file, this->dir_hash_table_size + this->dir_table_size, file_hash_table, this->file_hash_table_size, FsWriteOption_None));
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R_ASSERT(fsFileWrite(&metadata_file, this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size, file_table, this->file_table_size, FsWriteOption_None));
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}
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/* Populate directory tables. */
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{
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void *dt_buf = std::malloc(this->dir_table_size);
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|
void *dht_buf = std::malloc(this->dir_hash_table_size);
|
|
ON_SCOPE_EXIT { std::free(dht_buf); std::free(dt_buf); };
|
|
|
|
u32 *dir_hash_table = reinterpret_cast<u32 *>(dht_buf);
|
|
DirectoryEntry *dir_table = reinterpret_cast<DirectoryEntry *>(dt_buf);
|
|
std::memset(dir_hash_table, 0xFF, this->dir_hash_table_size);
|
|
|
|
for (const auto &it : this->directories) {
|
|
BuildDirectoryContext *cur_dir = it.get();
|
|
DirectoryEntry *cur_entry = GetDirectoryEntry(dir_table, cur_dir->entry_offset);
|
|
|
|
/* Set entry fields. */
|
|
cur_entry->parent = cur_dir == this->root ? 0 : cur_dir->parent->entry_offset;
|
|
cur_entry->sibling = (cur_dir->sibling == nullptr) ? EmptyEntry : cur_dir->sibling->entry_offset;
|
|
cur_entry->child = (cur_dir->child == nullptr) ? EmptyEntry : cur_dir->child->entry_offset;
|
|
cur_entry->file = (cur_dir->file == nullptr) ? EmptyEntry : cur_dir->file->entry_offset;
|
|
|
|
/* Insert into hash table. */
|
|
const u32 name_size = cur_dir->path_len;
|
|
const size_t hash_ind = CalculatePathHash(cur_entry->parent, cur_dir->path.get(), 0, name_size) % num_dir_hash_table_entries;
|
|
cur_entry->hash = dir_hash_table[hash_ind];
|
|
dir_hash_table[hash_ind] = cur_dir->entry_offset;
|
|
|
|
/* Set name. */
|
|
cur_entry->name_size = name_size;
|
|
if (name_size) {
|
|
std::memcpy(cur_entry->name, cur_dir->path.get(), name_size);
|
|
for (size_t i = name_size; i < util::AlignUp(name_size, 4); i++) {
|
|
cur_entry->name[i] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Write to file. */
|
|
R_ASSERT(fsFileWrite(&metadata_file, 0, dir_hash_table, this->dir_hash_table_size, FsWriteOption_None));
|
|
R_ASSERT(fsFileWrite(&metadata_file, this->dir_hash_table_size, dir_table, this->dir_table_size, FsWriteOption_None));
|
|
}
|
|
|
|
/* Delete maps. */
|
|
this->root = nullptr;
|
|
this->directories.clear();
|
|
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 = FilePartitionOffset;
|
|
header->dir_hash_table_ofs = util::AlignUp(FilePartitionOffset + this->file_partition_size, 4);
|
|
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;
|
|
|
|
/* Save metadata to the SD card, to save on memory space. */
|
|
{
|
|
R_ASSERT(fsFileFlush(&metadata_file));
|
|
out_infos->emplace_back(header->dir_hash_table_ofs, metadata_size, DataSourceType::Metadata, new RemoteFile(metadata_file));
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|