162 lines
5.9 KiB
Java
162 lines
5.9 KiB
Java
/*
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Copyright 2018-2022 Dmitry Isaenko
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This file is part of libKonogonka.
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libKonogonka is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libKonogonka is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with libKonogonka. If not, see <https://www.gnu.org/licenses/>.
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*/
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package libKonogonka.Tools.RomFs;
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import libKonogonka.Converter;
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import libKonogonka.ctraes.AesCtrBufferedInputStream;
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import libKonogonka.ctraes.AesCtrDecryptSimple;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.nio.file.Files;
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public class RomFsConstruct {
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//private final static Logger log = LogManager.getLogger(RomFsConstruct.class);
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private Level6Header header;
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private FileSystemEntry rootEntry;
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private final BufferedInputStream stream;
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private int headerSize;
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private byte[] directoryMetadataTable;
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private byte[] fileMetadataTable;
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private final File file;
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private long offsetPositionInFile;
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private final long level6Offset;
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RomFsConstruct(File file,
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long level6Offset) throws Exception{
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if (level6Offset < 0)
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throw new Exception("Incorrect Level 6 Offset");
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this.file = file;
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this.level6Offset = level6Offset;
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this.stream = new BufferedInputStream(Files.newInputStream(file.toPath()));
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constructEverything();
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}
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RomFsConstruct(File file,
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long ncaOffset, // NCA offset position
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long level6Offset,
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AesCtrDecryptSimple decryptor,
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long mediaStartOffset,
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long mediaEndOffset
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) throws Exception {
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if (level6Offset < 0)
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throw new Exception("Incorrect Level 6 Offset");
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this.file = file;
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this.level6Offset = level6Offset;
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this.offsetPositionInFile = ncaOffset + (mediaStartOffset * 0x200);
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this.stream = new AesCtrBufferedInputStream(
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decryptor,
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ncaOffset,
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mediaStartOffset,
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mediaEndOffset,
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Files.newInputStream(file.toPath()));
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constructEverything();
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}
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private void constructEverything() throws Exception{
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goToStartingPosition();
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constructHeader();
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directoryMetadataTableLengthCheck();
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directoryMetadataTableConstruct();
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fileMetadataTableLengthCheck();
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fileMetadataTableConstruct();
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constructRootFilesystemEntry();
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stream.close();
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}
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private void goToStartingPosition() throws Exception{
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skipBytes(offsetPositionInFile + level6Offset);
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}
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private void constructHeader() throws Exception{
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byte[] headerSizeBytes = detectHeaderSize();
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byte[] rawDataChunk = new byte[headerSize-0x8];
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if (stream.read(rawDataChunk) != headerSize-0x8)
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throw new Exception(String.format("Failed to read header (0x%x)", (headerSize-0x8)));
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byte[] lv6headerBytes = new byte[headerSize];
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System.arraycopy(headerSizeBytes, 0, lv6headerBytes, 0, 0x8);
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System.arraycopy(rawDataChunk, 0, lv6headerBytes, 0x8, headerSize-0x8);
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this.header = new Level6Header(lv6headerBytes);
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}
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private byte[] detectHeaderSize() throws Exception{
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byte[] lv6HeaderSizeRaw = new byte[0x8];
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if (stream.read(lv6HeaderSizeRaw) != 0x8)
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throw new Exception("Failed to read header size");
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headerSize = Converter.getLEint(lv6HeaderSizeRaw, 0);
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return lv6HeaderSizeRaw;
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}
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private void directoryMetadataTableLengthCheck() throws Exception{
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if (header.getDirectoryMetadataTableLength() < 0)
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throw new Exception("Not supported: DirectoryMetadataTableLength < 0");
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}
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private void directoryMetadataTableConstruct() throws Exception{
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skipBytes(header.getDirectoryMetadataTableOffset() - headerSize);
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directoryMetadataTable = new byte[(int) header.getDirectoryMetadataTableLength()];
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if (stream.read(directoryMetadataTable) != (int) header.getDirectoryMetadataTableLength())
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throw new Exception("Failed to read "+header.getDirectoryMetadataTableLength());
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}
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private void fileMetadataTableLengthCheck() throws Exception{
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if (header.getFileMetadataTableLength() < 0)
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throw new Exception("Not supported: FileMetadataTableLength < 0");
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}
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private void fileMetadataTableConstruct() throws Exception{
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skipBytes(header.getFileMetadataTableOffset() - header.getFileHashTableOffset());
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fileMetadataTable = new byte[(int) header.getFileMetadataTableLength()];
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if (stream.read(fileMetadataTable) != (int) header.getFileMetadataTableLength())
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throw new Exception("Failed to read "+header.getFileMetadataTableLength());
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}
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private void constructRootFilesystemEntry() throws Exception{
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try {
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rootEntry = new FileSystemEntry(directoryMetadataTable, fileMetadataTable);
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}
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catch (Exception e){
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throw new Exception("File: " + file.getName(), e);
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}
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}
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private void skipBytes(long size) throws Exception{
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long mustSkip = size;
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long skipped = 0;
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while (mustSkip > 0){
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skipped += stream.skip(mustSkip);
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mustSkip = size - skipped;
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}
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}
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Level6Header getHeader() { return header; }
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FileSystemEntry getRootEntry(){ return rootEntry; }
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byte[] getDirectoryMetadataTable() { return directoryMetadataTable; }
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byte[] getFileMetadataTable() { return fileMetadataTable;}
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}
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