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annotate src/org/tmatesoft/hg/internal/DeflaterDataSerializer.java @ 599:55b7987c1796

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Do not instantiate intermediate arrays
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 May 2013 15:29:26 +0200
parents 243202f1bda5
children 7c0d2ce340b8
rev   line source
534
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.IOException;
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20 import java.util.zip.Deflater;
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21 import java.util.zip.DeflaterOutputStream;
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22
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23 /**
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24 * {@link DeflaterOutputStream} counterpart for {@link DataSerializer} API
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 class DeflaterDataSerializer extends DataSerializer {
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31 private static final int AUX_BUFFER_CAPACITY = 5; // room for 5 ints
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33 private final DataSerializer delegate;
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34 private final Deflater deflater;
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35 private final byte[] deflateOutBuffer;
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36 private final byte[] auxBuffer;
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37
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38 public DeflaterDataSerializer(DataSerializer delegateSerializer, Deflater def, int bufferSizeHint) {
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39 delegate = delegateSerializer;
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40 deflater = def;
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41 deflateOutBuffer = new byte[bufferSizeHint <= 0 ? 2048 : bufferSizeHint];
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42 auxBuffer = new byte[4 * AUX_BUFFER_CAPACITY]; // sizeof(int) * capacity
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43 }
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44
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45 @Override
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46 public void writeInt(int... values) throws IOException {
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47 for (int i = 0; i < values.length; i+= AUX_BUFFER_CAPACITY) {
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48 int idx = 0;
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49 for (int j = i, x = Math.min(values.length, i + AUX_BUFFER_CAPACITY); j < x; j++) {
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50 int v = values[j];
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51 auxBuffer[idx++] = (byte) ((v >>> 24) & 0x0ff);
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52 auxBuffer[idx++] = (byte) ((v >>> 16) & 0x0ff);
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53 auxBuffer[idx++] = (byte) ((v >>> 8) & 0x0ff);
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54 auxBuffer[idx++] = (byte) (v & 0x0ff);
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55 }
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56 internalWrite(auxBuffer, 0, idx);
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57 }
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58 }
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59
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60 @Override
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61 public void write(byte[] data, int offset, int length) throws IOException {
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62 // @see DeflaterOutputStream#write(byte[], int, int)
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63 int stride = deflateOutBuffer.length;
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64 for (int i = 0; i < length; i += stride) {
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65 internalWrite(data, offset + i, Math.min(stride, length - i));
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66 }
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67 }
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69 private void internalWrite(byte[] data, int offset, int length) throws IOException {
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70 deflater.setInput(data, offset, length);
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71 while (!deflater.needsInput()) {
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72 deflate();
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73 }
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74 }
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75
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76 @Override
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77 public void done() {
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78 delegate.done();
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79 }
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81 public void finish() throws IOException {
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82 if (!deflater.finished()) {
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83 deflater.finish();
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84 while (!deflater.finished()) {
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85 deflate();
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86 }
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90 protected void deflate() throws IOException {
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91 int len = deflater.deflate(deflateOutBuffer, 0, deflateOutBuffer.length);
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92 if (len > 0) {
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93 delegate.write(deflateOutBuffer, 0, len);
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94 }
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95 }
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96 }