Package org.h2.compress

Examples of org.h2.compress.CompressLZF.compress()

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        conn.close();
        Compressor compress = new CompressLZF();
        int pageSize = Constants.DEFAULT_PAGE_SIZE;
        byte[] buff = new byte[pageSize];
        byte[] test = new byte[2 * pageSize];
        compress.compress(buff, pageSize, test, 0);
        for (int j = 0; j < 4; j++) {
            long time = System.currentTimeMillis();
            for (int i = 0; i < 1000; i++) {
                InputStream in = FileSystem.getInstance("memFS:").openFileInputStream("memFS:compress.h2.db");
                int total = 0;
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                while (true) {
                    int len = in.read(buff);
                    if (len < 0) {
                        break;
                    }
                    total += compress.compress(buff, pageSize, test, 0);
                }
                in.close();
            }
            System.out.println("compress: " + (System.currentTimeMillis() - time) + " ms");
        }
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            while (true) {
                int len = in.read(buff);
                if (len < 0) {
                    break;
                }
                int b = compress.compress(buff, pageSize, test, 0);
                byte[] data = new byte[b];
                System.arraycopy(test, 0, data, 0, b);
                comp.add(data);
            }
            in.close();
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        conn.close();
        Compressor compress = new CompressLZF();
        int pageSize = Constants.DEFAULT_PAGE_SIZE;
        byte[] buff = new byte[pageSize];
        byte[] test = new byte[2 * pageSize];
        compress.compress(buff, pageSize, test, 0);
        for (int j = 0; j < 4; j++) {
            long time = System.currentTimeMillis();
            for (int i = 0; i < 1000; i++) {
                InputStream in = FileSystem.getInstance("memFS:").openFileInputStream("memFS:compress.h2.db");
                int total = 0;
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                while (true) {
                    int len = in.read(buff);
                    if (len < 0) {
                        break;
                    }
                    total += compress.compress(buff, pageSize, test, 0);
                }
                in.close();
            }
            System.out.println("compress: " + (System.currentTimeMillis() - time) + " ms");
        }
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            while (true) {
                int len = in.read(buff);
                if (len < 0) {
                    break;
                }
                int b = compress.compress(buff, pageSize, test, 0);
                byte[] data = new byte[b];
                System.arraycopy(test, 0, data, 0, b);
                comp.add(data);
            }
            in.close();
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                    CompressTool tool = CompressTool.getInstance();
                    byte[] buff = new byte[1024];
                    Random r = new Random();
                    while (!stop) {
                        r.nextBytes(buff);
                        byte[] test = tool.expand(tool.compress(buff, "LZF"));
                        assertEquals(buff, test);
                    }
                }
            };
            tasks[i] = t;
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            for (int j = 0; j < i; j++) {
                buff.append((char) ('1' + j));
            }
            String test = buff.toString();
            byte[] in = test.getBytes();
            assertEquals(in, utils.expand(utils.compress(in, "LZF")));
        }
    }

    private void testDatabase() throws Exception {
        deleteDb("memFS:compress");
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            }
            CompressTool utils = CompressTool.getInstance();
            // level 9 is highest, strategy 2 is huffman only
            for (String a : new String[] { "LZF", "No", "Deflate", "Deflate level 9 strategy 2" }) {
                long time = System.currentTimeMillis();
                byte[] out = utils.compress(buff, a);
                byte[] test = utils.expand(out);
                if (testPerformance) {
                    System.out.println("p:" + pattern + " len: " + out.length + " time: " + (System.currentTimeMillis() - time) + " " + a);
                }
                assertEquals(buff.length, test.length);
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