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feat: support header-encrypted archive
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package com.github.junrar.io; | ||
|
|
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| import javax.crypto.Cipher; | ||
| import java.io.IOException; | ||
| import java.util.LinkedList; | ||
|
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| public class RawDataIo implements SeekableReadOnlyByteChannel { | ||
| private Cipher cipher = null; | ||
| private final SeekableReadOnlyByteChannel underlyingByteChannel; | ||
| private boolean isEncrypted = false; | ||
| private final LinkedList<Byte> dataPool = new LinkedList<>(); | ||
| private final byte[] reused = new byte[1]; | ||
|
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| public RawDataIo(SeekableReadOnlyByteChannel channel) { | ||
| this.underlyingByteChannel = channel; | ||
| } | ||
|
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| public Cipher getCipher() { | ||
| return cipher; | ||
| } | ||
|
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| public void setCipher(Cipher cipher) { | ||
| this.cipher = cipher; | ||
| isEncrypted = true; | ||
| } | ||
|
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| @Override | ||
| public long getPosition() throws IOException { | ||
| return underlyingByteChannel.getPosition(); | ||
| } | ||
|
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| @Override | ||
| public void setPosition(long pos) throws IOException { | ||
| underlyingByteChannel.setPosition(pos); | ||
| } | ||
|
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| @Override | ||
| public int read() throws IOException { | ||
| read(reused, 0, 1); | ||
| return reused[0]; | ||
| } | ||
|
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| @Override | ||
| public int read(byte[] buffer, int off, int count) throws IOException { | ||
| byte[] tmp = new byte[count]; | ||
| int size = readFully(tmp, count); | ||
| System.arraycopy(tmp, 0, buffer, off, count); | ||
| return size; | ||
| } | ||
|
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| @Override | ||
| public int readFully(byte[] buffer, int count) throws IOException { | ||
| if (isEncrypted) { | ||
| int remainingSize = dataPool.size(); | ||
| int toRead = count - remainingSize; | ||
| int realRead = toRead + ((~toRead + 1) & 0xF); | ||
| byte[] tmp = new byte[realRead]; | ||
|
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| if (realRead > 0) { | ||
| underlyingByteChannel.readFully(tmp, realRead); | ||
| byte[] decrypted = cipher.update(tmp); | ||
| for (int i = 0; i < decrypted.length; i++) { | ||
| dataPool.add(decrypted[i]); | ||
| } | ||
| } | ||
|
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| int realReadSize = 0; | ||
| for (int i = 0; i < count && !dataPool.isEmpty(); i++) { | ||
| buffer[i] = dataPool.poll(); | ||
| realReadSize++; | ||
| } | ||
| return realReadSize; | ||
|
|
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| } else { | ||
| return underlyingByteChannel.readFully(buffer, count); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void close() throws IOException { | ||
| this.underlyingByteChannel.close(); | ||
| } | ||
|
|
||
| } |
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