| /* |
| * SimpleOutputStream |
| * |
| * Author: Lasse Collin <lasse.collin@tukaani.org> |
| * |
| * This file has been put into the public domain. |
| * You can do whatever you want with this file. |
| */ |
| |
| package org.tukaani.xz; |
| |
| import java.io.IOException; |
| import org.tukaani.xz.simple.SimpleFilter; |
| |
| class SimpleOutputStream extends FinishableOutputStream { |
| private static final int FILTER_BUF_SIZE = 4096; |
| |
| private FinishableOutputStream out; |
| private final SimpleFilter simpleFilter; |
| |
| private final byte[] filterBuf = new byte[FILTER_BUF_SIZE]; |
| private int pos = 0; |
| private int unfiltered = 0; |
| |
| private IOException exception = null; |
| private boolean finished = false; |
| |
| private final byte[] tempBuf = new byte[1]; |
| |
| static int getMemoryUsage() { |
| return 1 + FILTER_BUF_SIZE / 1024; |
| } |
| |
| SimpleOutputStream(FinishableOutputStream out, |
| SimpleFilter simpleFilter) { |
| if (out == null) |
| throw new NullPointerException(); |
| |
| this.out = out; |
| this.simpleFilter = simpleFilter; |
| } |
| |
| public void write(int b) throws IOException { |
| tempBuf[0] = (byte)b; |
| write(tempBuf, 0, 1); |
| } |
| |
| public void write(byte[] buf, int off, int len) throws IOException { |
| if (off < 0 || len < 0 || off + len < 0 || off + len > buf.length) |
| throw new IndexOutOfBoundsException(); |
| |
| if (exception != null) |
| throw exception; |
| |
| if (finished) |
| throw new XZIOException("Stream finished or closed"); |
| |
| while (len > 0) { |
| // Copy more unfiltered data into filterBuf. |
| int copySize = Math.min(len, FILTER_BUF_SIZE - (pos + unfiltered)); |
| System.arraycopy(buf, off, filterBuf, pos + unfiltered, copySize); |
| off += copySize; |
| len -= copySize; |
| unfiltered += copySize; |
| |
| // Filter the data in filterBuf. |
| int filtered = simpleFilter.code(filterBuf, pos, unfiltered); |
| assert filtered <= unfiltered; |
| unfiltered -= filtered; |
| |
| // Write out the filtered data. |
| try { |
| out.write(filterBuf, pos, filtered); |
| } catch (IOException e) { |
| exception = e; |
| throw e; |
| } |
| |
| pos += filtered; |
| |
| // If end of filterBuf was reached, move the pending unfiltered |
| // data to the beginning of the buffer so that more data can |
| // be copied into filterBuf on the next loop iteration. |
| if (pos + unfiltered == FILTER_BUF_SIZE) { |
| System.arraycopy(filterBuf, pos, filterBuf, 0, unfiltered); |
| pos = 0; |
| } |
| } |
| } |
| |
| private void writePending() throws IOException { |
| assert !finished; |
| |
| if (exception != null) |
| throw exception; |
| |
| try { |
| out.write(filterBuf, pos, unfiltered); |
| } catch (IOException e) { |
| exception = e; |
| throw e; |
| } |
| |
| finished = true; |
| } |
| |
| public void flush() throws IOException { |
| throw new UnsupportedOptionsException("Flushing is not supported"); |
| } |
| |
| public void finish() throws IOException { |
| if (!finished) { |
| // If it fails, don't call out.finish(). |
| writePending(); |
| |
| try { |
| out.finish(); |
| } catch (IOException e) { |
| exception = e; |
| throw e; |
| } |
| } |
| } |
| |
| public void close() throws IOException { |
| if (out != null) { |
| if (!finished) { |
| // out.close() must be called even if writePending() fails. |
| // writePending() saves the possible exception so we can |
| // ignore exceptions here. |
| try { |
| writePending(); |
| } catch (IOException e) {} |
| } |
| |
| try { |
| out.close(); |
| } catch (IOException e) { |
| // If there is an earlier exception, the exception |
| // from out.close() is lost. |
| if (exception == null) |
| exception = e; |
| } |
| |
| out = null; |
| } |
| |
| if (exception != null) |
| throw exception; |
| } |
| } |