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RomFsEncryptedProvider complete

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This commit is contained in:
Dmitry Isaenko 2020-04-29 17:35:34 +03:00
parent 8225f0fcba
commit 416e5280a6
1 changed files with 67 additions and 19 deletions
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84
src/main/java/konogonka/Tools/RomFs/RomFsEncryptedProvider.java
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@ -26,7 +26,7 @@ import java.util.Arrays;
public class RomFsEncryptedProvider implements IRomFsProvider{
private static long level6Offset;
private long level6Offset;
private File file;
private Level6Header header;
@ -189,33 +189,80 @@ public class RomFsEncryptedProvider implements IRomFsProvider{
Thread workerThread;
PipedInputStream streamIn = new PipedInputStream(streamOut);
workerThread = new Thread(() -> {
System.out.println("RomFsDecryptedProvider -> getContent(): Executing thread");
try {
long subFileRealPosition = level6Offset + header.getFileDataOffset() + entry.getFileOffset();
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
bis.skip(subFileRealPosition);
int readPice = 8388608; // 8mb NOTE: consider switching to 1mb 1048576
byte[] encryptedBlock;
byte[] dectyptedBlock;
long readFrom = 0;
long realFileSize = entry.getFileSize();
RandomAccessFile raf = new RandomAccessFile(file, "r");
byte[] readBuf;
//0
AesCtrDecryptSimple decryptor = new AesCtrDecryptSimple(key, sectionCTR, mediaStartOffset * 0x200);
while (readFrom < realFileSize) {
if (realFileSize - readFrom < readPice)
readPice = Math.toIntExact(realFileSize - readFrom); // it's safe, I guarantee
readBuf = new byte[readPice];
if (bis.read(readBuf) != readPice) {
System.out.println("RomFsDecryptedProvider -> getContent(): Unable to read requested size from file.");
long startBlock = (entry.getFileOffset() + header.getFileDataOffset()) / 0x200;
decryptor.skipNext(level6Offset / 0x200 + startBlock);
long abosluteOffsetPosition = romFSoffsetPosition + (mediaStartOffset * 0x200);
raf.seek(abosluteOffsetPosition + level6Offset + startBlock * 0x200);
//1
long ignoreBytes = (entry.getFileOffset() + header.getFileDataOffset()) - startBlock * 0x200;
if (ignoreBytes > 0) {
encryptedBlock = new byte[0x200];
if (raf.read(encryptedBlock) == 0x200) {
dectyptedBlock = decryptor.dectyptNext(encryptedBlock);
// If we have extra-small file that is less then a block and even more
if ((0x200 - ignoreBytes) > entry.getFileSize()){
streamOut.write(dectyptedBlock, (int)ignoreBytes, (int) entry.getFileSize()); // safe cast
raf.close();
streamOut.close();
return;
}
streamOut.write(readBuf);
readFrom += readPice;
else {
streamOut.write(dectyptedBlock, (int) ignoreBytes, 0x200 - (int) ignoreBytes);
}
bis.close();
}
else {
throw new Exception("RomFsEncryptedProvider(): Unable to get 512 bytes from 1st bock for Directory Metadata Table");
}
startBlock++;
}
long endBlock = (entry.getFileSize() + ignoreBytes) / 0x200 + startBlock; // <- pointing to place where any data related to this media-block ends
//2
int extraData = (int) ((endBlock - startBlock)*0x200 - (entry.getFileSize() + ignoreBytes));
if (extraData < 0)
endBlock--;
//3
while ( startBlock < endBlock ) {
encryptedBlock = new byte[0x200];
if (raf.read(encryptedBlock) == 0x200) {
dectyptedBlock = decryptor.dectyptNext(encryptedBlock);
streamOut.write(dectyptedBlock);
}
else
throw new Exception("RomFsEncryptedProvider(): Unable to get 512 bytes from block for Directory Metadata Table");
startBlock++;
}
//4
if (extraData != 0){ // In case we didn't get what we want
encryptedBlock = new byte[0x200];
if (raf.read(encryptedBlock) == 0x200) {
dectyptedBlock = decryptor.dectyptNext(encryptedBlock);
streamOut.write(dectyptedBlock, 0, Math.abs(extraData));
}
else
throw new Exception("RomFsEncryptedProvider(): Unable to get 512 bytes from block for Directory Metadata Table");
}
raf.close();
streamOut.close();
} catch (Exception e) {
System.out.println("RomFsDecryptedProvider -> getContent(): Unable to provide stream");
@ -226,6 +273,7 @@ public class RomFsEncryptedProvider implements IRomFsProvider{
workerThread.start();
return streamIn;
}
@Override
public File getFile() {
return file;