commit bf12a66730d3a11588b5a97016817766575bffbd
Author: beerpsi <beerpsi@duck.com>
Date:   Wed Jul 10 16:44:47 2024 +0700

    push

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..65d44d2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.ruff_cache
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3c5eebe
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# x
+
+Miscellaneous scripts that don't need their own repo.
+
+## Arcaea
+- `acaca/arcpack.py`: Script to extract Arcaea Nintendo Switch `arc.pack` files
+
+## CHUNITHM
+- `chuni/rekey_opt.ps1`: Rekeys a CHUNITHM International option so that audio doesn't shit
+the bed when importing into the Japanese version. There must be a `bin` folder next
+to this script with [DereTore](https://github.com/OpenCGSS/DereTore/releases/latest)
+and [SonicAudioTools](https://github.com/blueskythlikesclouds/SonicAudioTools/releases/latest)
+extracted into it.
+
+## Card Maker
+- `cm/cmpack.py`: Script to work with Card Maker `.pac` files
diff --git a/acaca/arcpack.py b/acaca/arcpack.py
new file mode 100644
index 0000000..b8ca195
--- /dev/null
+++ b/acaca/arcpack.py
@@ -0,0 +1,83 @@
+# pyright: reportAny=false
+"""
+Script to extract arc.pack files used by Arcaea Nintendo Switch.
+
+Usage:
+
+- Extract the contents of an arc.pack file:
+    python arcpack.py x arc.pack arc.json output
+"""
+import argparse
+import json
+import os
+from pathlib import Path
+from typing import TypedDict, cast
+
+
+class ArcJSONEntry(TypedDict):
+    OriginalFilename: str
+    Offset: int
+    Length: int
+
+
+class ArcJSONGroup(TypedDict):
+    Name: str
+    Offset: int
+    Length: int
+    OrderedEntries: list[ArcJSONEntry]
+
+
+class ArcJSON(TypedDict):
+    Groups: list[ArcJSONGroup]
+
+
+def arcpack_extract(args: argparse.Namespace):
+    arcpack = cast(Path, args.arcpack)
+    arcjson = cast(Path, args.arcjson)
+    output = cast(Path, args.output_directory)
+
+    with arcjson.open("r", encoding="utf-8") as f:
+        toc: ArcJSON = json.load(f)
+    
+    try:
+        from tqdm import tqdm
+
+        total = 0
+
+        for group in toc["Groups"]:
+            total += len(group["OrderedEntries"])
+
+        pb = tqdm(
+            desc="Extracting pack",
+            total=total,
+        )
+    except ImportError:
+        pb = None
+    
+    with arcpack.open("rb") as f:
+        for group in toc["Groups"]:
+            for entry in group["OrderedEntries"]:
+                target = output / entry["OriginalFilename"]
+
+                target.mkdir(parents=True, exist_ok=True)
+
+                _ = f.seek(entry["Offset"], os.SEEK_SET)
+
+                with target.open("wb") as ft:
+                    _ = ft.write(f.read(entry["Length"]))
+
+                if pb is not None:
+                    _ = pb.update(1)
+    
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="arc.pack extractor")
+    subcommands = parser.add_subparsers(required=True)
+
+    extract_command = subcommands.add_parser("x", help="Extract")
+    _ = extract_command.add_argument("arcpack", type=Path)
+    _ = extract_command.add_argument("arcjson", type=Path)
+    _ = extract_command.add_argument("output_directory", type=Path)
+
+    args = parser.parse_args()
+    args.func(args)
diff --git a/chuni/rekey_opt.ps1 b/chuni/rekey_opt.ps1
new file mode 100644
index 0000000..eacf357
--- /dev/null
+++ b/chuni/rekey_opt.ps1
@@ -0,0 +1,38 @@
+param (
+    [Parameter(Mandatory=$true)]
+    [string]$opt
+)
+
+Add-Type -Path "bin/DereTore.Exchange.Audio.HCA.dll"
+
+$ccFrom = [DereTore.Exchange.Audio.HCA.CipherConfig]::new()
+$ccFrom.Key1 = 3728959580
+$ccFrom.Key2 = 7782811
+
+$ccTo = [DereTore.Exchange.Audio.HCA.CipherConfig]::new()
+$ccTo.Key1 = 3458615040
+$ccTo.Key2 = 7667487
+$ccTo.CipherType = 56
+
+Get-ChildItem (Join-Path $opt "cueFile") | ForEach-Object {
+    $acb = (Get-ChildItem "$($_.FullName)\*.acb" | Select-Object -First 1).FullName
+    $unpacked_folder = "$($_.FullName)\$([IO.Path]::GetFileNameWithoutExtension($acb))"
+    
+    .\bin\AcbEditor.exe "$acb"
+
+    Get-ChildItem "$unpacked_folder\*.hca" | ForEach-Object {
+        $inputStream = [IO.FileStream]::new($_.FullName, [IO.FileMode]::Open, [IO.FileAccess]::Read)
+        $outputStream = [IO.FileStream]::new("$($_.FullName).new", [IO.FileMode]::Create, [IO.FileAccess]::Write)
+        $converter = [DereTore.Exchange.Audio.HCA.CipherConverter]::new($inputStream, $outputStream, $ccFrom, $ccTo)
+        $converter.Convert()
+        
+        $outputStream.Dispose()
+        $inputStream.Dispose()
+
+        Move-Item -Force "$($_.FullName).new" "$($_.FullName)"
+    }
+
+    .\bin\AcbEditor.exe "$unpacked_folder"
+
+    Remove-Item -Recurse "$unpacked_folder"
+}
\ No newline at end of file
diff --git a/cm/cmpack.py b/cm/cmpack.py
new file mode 100644
index 0000000..1d58234
--- /dev/null
+++ b/cm/cmpack.py
@@ -0,0 +1,391 @@
+# pyright: reportAny=false
+"""
+A script to work with the packed filesystem used by CardMaker
+(CardMaker_Data/StreamingAssets/MU3/Data/A000.pac).
+
+Usage:
+
+- Extract the contents of a pac file:
+    python cmpack.py x <.pac file> <output directory>
+- Create a pac file from a base directory:
+    python cmpack.py a <.pac file> <input directory>
+- List contents of a .pac file:
+    python cmpack.py l <.pac file>
+
+The pac file format:
+
+- Header (32 bytes)
+  - Magic: 50 41 43 4B ("PACK")
+  - Reserved: The game fills in 4 random bytes.
+  - Number of entries: 64-bit signed integer
+  - Offset of string table: 64-bit signed integer. The string table is used for storing
+  filenames, and is encoded with UTF-16 LE.
+  - Offset of file data: 64-bit signed integer.
+- Entries (28 byte * number of entries)
+  - Type: 32-bit signed integer
+    - 0: File
+    - 1: Directory
+  - Flags: 32-bit signed integer, always set to 0.
+  - Offset of filename: 32-bit signed integer, is the *character* offset of the filename
+  in the string. **NOT A BYTE OFFSET!**
+  - Length of filename: 32-bit signed integer
+  - Length of file data: 32-bit signed integer
+  - Offset of file data: 64-bit signed integer, starting from the offset of file data declared
+  in the header.
+- String table
+- File data
+- Adler32 checksum of all of the above
+"""
+import argparse
+import os
+import random
+import struct
+import zlib
+from collections.abc import Generator
+from dataclasses import dataclass
+from io import BufferedIOBase
+from pathlib import Path
+from typing import Any, NamedTuple, cast
+
+PACK_MAGIC = 0x4B434150
+PACK_HEADER_FORMAT = "<IIqqq"
+PACK_ENTRY_FORMAT = "<iiiiiq"
+
+
+class PackHeader(NamedTuple):
+    """
+    The header of a CardMaker pack file.
+    """
+
+    magic: int
+    """
+    Constant `0x4B434150`.
+    """
+
+    reserved: int
+    """
+    Reserved field.
+    """
+
+    num_entries: int
+    """
+    Number of entries (files and folders) in the pack.
+    """
+
+    offset_string: int
+    """
+    Offset to the string table (UTF-16 LE) containing all filenames.
+    """
+
+    offset_data: int
+    """
+    Offset to actual file data.
+    """
+
+
+class PackEntry(NamedTuple):
+    """
+    A CardMaker pack file entry.
+    """
+
+    type: int
+    """
+    The type of the entry: `0` for files, and `1` for folders.
+    """
+
+    flags: int
+    """
+    Unused and should be set to `0`.
+    """
+
+    name_offset: int
+    """
+    The **character** offset of the filename in the string table.
+    """
+
+    name_length: int
+    """
+    The length of the filename.
+    """
+
+    data_length: int
+    """
+    If entry is a file, the length of the file data. If entry is a folder,
+    the number of children.
+    """
+
+    data_offset: int
+    """
+    If entry is a file, the offset of the file data, starting from
+    :attr:`PackHeader.offset_data`. If entry is a folder, the starting index
+    of its children in the list of entries.
+    """
+
+
+class PackFile:
+    def __init__(self, entry: PackEntry, string_table: str) -> None:
+        if entry.type != 0:
+            raise ValueError(f"Invalid entry ID {entry.type} (expected 0).")
+
+        self.name = string_table[
+            entry.name_offset : entry.name_offset + entry.name_length
+        ]
+        self.offset = entry.data_offset
+        self.length = entry.data_length
+
+
+class PackFolder:
+    def __init__(
+        self, entries: list[PackEntry], entry_id: int, string_table: str
+    ) -> None:
+        entry = entries[entry_id]
+
+        if entry.type != 1:
+            raise ValueError(f"Invalid entry ID {entry.type} (expected 1).")
+
+        self.name = string_table[
+            entry.name_offset : entry.name_offset + entry.name_length
+        ]
+        self.files: dict[str, PackFile] = {}
+        self.folders: dict[str, PackFolder] = {}
+
+        for i in range(entry.data_length):
+            child_id = entry.data_offset + i
+            child_entry = entries[child_id]
+
+            if child_entry.type == 0:
+                f = PackFile(child_entry, string_table)
+                self.files[f.name] = f
+            elif child_entry.type == 1:
+                f = PackFolder(entries, child_id, string_table)
+                self.folders[f.name] = f
+            else:
+                raise ValueError(
+                    f"Entry {child_id} has unknown type {child_entry.type}."
+                )
+
+
+@dataclass
+class Pack:
+    header: PackHeader
+    entries: list[PackEntry]
+    root: PackFolder
+
+
+def decode_pack_meta(f: BufferedIOBase):
+    header = PackHeader._make(struct.unpack(PACK_HEADER_FORMAT, f.read(32)))
+
+    if header.magic != PACK_MAGIC:
+        raise Exception(f"Invalid pack file: {header.magic:x} != {PACK_MAGIC:x}")
+
+    _ = f.seek(header.offset_string, os.SEEK_SET)
+    string_table = f.read(header.offset_data - header.offset_string).decode("utf-16-le")
+
+    _ = f.seek(32, os.SEEK_SET)
+    entries: list[PackEntry] = []
+
+    for _ in range(header.num_entries):
+        entries.append(PackEntry._make(struct.unpack(PACK_ENTRY_FORMAT, f.read(28))))
+
+    tree = PackFolder(entries, 0, string_table)
+
+    return Pack(header, entries, tree)
+
+
+def traverse_pack(
+    folder: PackFolder, path: Path
+) -> Generator[tuple[Path, PackFile], Any, None]:
+    for file in folder.files.values():
+        yield (path / file.name, file)
+
+    for folder in folder.folders.values():
+        child_path = path / folder.name
+
+        yield from traverse_pack(folder, child_path)
+
+
+def walk_breadth_first(root: Path) -> Generator[tuple[Path, list[Path]], Any, None]:
+    children = list(root.iterdir())
+
+    yield root, children
+
+    for path in children:
+        if path.is_dir():
+            yield from walk_breadth_first(path)
+
+
+def pack_extract(args: argparse.Namespace):
+    archive_name = cast(Path, args.archive_name)
+    output_directory = cast(Path, args.output_directory)
+
+    if output_directory.exists() and not output_directory.is_dir():
+        raise ValueError(f"Output {output_directory} is not a folder.")
+
+    if not output_directory.exists():
+        output_directory.mkdir(parents=True)
+
+    with archive_name.open("rb") as f:
+        actual_checksum = zlib.adler32(f.read()[:-4])
+        _ = f.seek(-4, os.SEEK_END)
+        expected_checksum = struct.unpack("<i", f.read(4))[0]
+
+        if actual_checksum != expected_checksum:
+            raise RuntimeError(f"Invalid pack file, checksums don't match: {actual_checksum:x} != {expected_checksum:x}")
+        
+        _ = f.seek(0)
+        pack = decode_pack_meta(f)
+
+        try:
+            from tqdm import tqdm
+
+            pb = tqdm(
+                desc="Extracting pack",
+                total=len([x for x in pack.entries if x.type == 0]),
+            )
+        except ImportError:
+            pb = None
+
+        for path, file in traverse_pack(pack.root, output_directory):
+            path.parent.mkdir(parents=True, exist_ok=True)
+
+            _ = f.seek(pack.header.offset_data + file.offset, os.SEEK_SET)
+
+            with path.open("wb") as fo:
+                _ = fo.write(f.read(file.length))
+
+            if pb is not None:
+                _ = pb.update(1)
+
+
+def pack_archive(args: argparse.Namespace):
+    archive_name = cast(Path, args.archive_name)
+    root = cast(Path, args.root_directory)
+
+    string_table = ""
+    string_table_lookup: dict[str, int] = {}
+    entries = [
+        {
+            "type": 1,
+            "flags": 0,
+            "name_length": 0,
+            "name_offset": 0,
+            "data_offset": 1,
+        }
+    ]
+    entry_indexes = {root: 0}
+
+    files: list[Path] = []
+    file_offset = 0
+
+    # Figure out the pack entries by walking the file tree
+    # breadth first.
+    for parent, children in walk_breadth_first(root):
+        if parent == root:
+            entries[0]["data_length"] = len(children)
+
+        if entry_index := entry_indexes.get(parent):
+            entries[entry_index]["data_offset"] = len(entries)
+            entries[entry_index]["data_length"] = len(children)
+
+        for child in children:
+            if (name_offset := string_table_lookup.get(child.name)) is None:
+                name_offset = string_table_lookup[child.name] = len(string_table)
+                string_table += child.name
+
+            entry = {
+                "flags": 0,
+                "name_length": len(child.name),
+                "name_offset": name_offset,
+            }
+
+            if child.is_dir():
+                entry["type"] = 1
+                entry_indexes[child] = len(entries)
+                # data_offset and data_length will be filled in when we walk to them as the parent.
+            else:
+                size = child.stat().st_size
+
+                entry["type"] = 0
+                entry["data_offset"] = file_offset
+                entry["data_length"] = size
+
+                files.append(child)
+                file_offset += size
+
+            entries.append(entry)
+
+    # Actually write the pack.
+    with archive_name.open("wb") as f:
+        checksum = 1
+        string_table_bytes = string_table.encode("utf-16-le")
+        num_entries = len(entries)
+
+        # 32 bytes for the header, and 28 bytes for each entry in the pack.
+        offset_string = 32 + 28 * num_entries
+
+        header = PackHeader(
+            PACK_MAGIC,
+            random.randrange(0, 255) << 24
+            | random.randrange(0, 255) << 16
+            | random.randrange(0, 255) << 8
+            | random.randrange(0, 255),
+            num_entries,
+            offset_string,
+            offset_string + len(string_table_bytes),
+        )
+        data = struct.pack(PACK_HEADER_FORMAT, *header)
+        checksum = zlib.adler32(data, checksum)
+        _ = f.write(data)
+
+        for entry in entries:
+            data = struct.pack(PACK_ENTRY_FORMAT, *PackEntry(**entry))
+            checksum = zlib.adler32(data, checksum)
+            _ = f.write(data)
+
+        checksum = zlib.adler32(string_table_bytes, checksum)
+        _ = f.write(string_table_bytes)
+
+        for file in files:
+            with file.open("rb") as fp:
+                data = fp.read()
+                checksum = zlib.adler32(data, checksum)
+                _ = f.write(data)
+        
+        _ = f.write(struct.pack("<i", checksum))
+
+
+def pack_list(args: argparse.Namespace):
+    archive_name = cast(Path, args.archive_name)
+
+    with archive_name.open("rb") as f:
+        pack = decode_pack_meta(f)
+
+        print("  Size  Name")
+        print("------  ------")
+
+        for path, file in traverse_pack(pack.root, Path("")):
+            print(f"{file.length:6}  {path}")
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="Script for working with CardMaker pack files"
+    )
+    subcommands = parser.add_subparsers(required=True)
+
+    extract_command = subcommands.add_parser("x", help="Extract a CardMaker pack")
+    _ = extract_command.add_argument("archive_name", type=Path)
+    _ = extract_command.add_argument("output_directory", type=Path)
+    _ = extract_command.set_defaults(func=pack_extract)
+
+    archive_command = subcommands.add_parser("a", help="Create a CardMaker pack")
+    _ = archive_command.add_argument("archive_name", type=Path)
+    _ = archive_command.add_argument("root_directory", type=Path)
+    _ = archive_command.set_defaults(func=pack_archive)
+
+    list_command = subcommands.add_parser("l", help="List contents of a CardMaker pack")
+    _ = list_command.add_argument("archive_name", type=Path)
+    _ = list_command.set_defaults(func=pack_list)
+
+    args = parser.parse_args()
+    args.func(args)