/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tika.parser.chm.core;
import static java.nio.charset.StandardCharsets.UTF_8;
public class ChmConstants {
/* Prevents instantiation */
private ChmConstants() {
}
public static final String DEFAULT_CHARSET = UTF_8.name();
public static final String ITSF = "ITSF";
public static final String ITSP = "ITSP";
public static final String PMGL = "PMGL";
public static final String LZXC = "LZXC";
public static final String CHM_PMGI_MARKER = "PMGI";
public static final int BYTE_ARRAY_LENGHT = 16;
public static final int CHM_ITSF_V2_LEN = 0x58;
public static final int CHM_ITSF_V3_LEN = 0x60;
public static final int CHM_ITSP_V1_LEN = 0x54;
public static final int CHM_PMGL_LEN = 0x14;
public static final int CHM_PMGI_LEN = 0x08;
public static final int CHM_LZXC_RESETTABLE_V1_LEN = 0x28;
public static final int CHM_LZXC_MIN_LEN = 0x18;
public static final int CHM_LZXC_V2_LEN = 0x1c;
public static final int CHM_SIGNATURE_LEN = 4;
public static final int CHM_VER_2 = 2;
public static final int CHM_VER_3 = 3;
public static final int CHM_VER_1 = 1;
public static final int CHM_WINDOW_SIZE_BLOCK = 0x8000;
/* my hacking */
public static final int START_PMGL = 0xCC;
public static final String CONTROL_DATA = "ControlData";
public static final String RESET_TABLE = "ResetTable";
public static final String CONTENT = "Content";
/* some constants defined by the LZX specification */
public static final int LZX_MIN_MATCH = 2;
public static final int LZX_MAX_MATCH = 257;
public static final int LZX_NUM_CHARS = 256;
public static final int LZX_BLOCKTYPE_INVALID = 0; /*
* also blocktypes 4-7
* invalid
*/
public static final int LZX_BLOCKTYPE_VERBATIM = 1;
public static final int LZX_BLOCKTYPE_ALIGNED = 2;
public static final int LZX_BLOCKTYPE_UNCOMPRESSED = 3;
public static final int LZX_PRETREE_NUM_ELEMENTS_BITS = 4; /* ??? */
public static final int LZX_PRETREE_NUM_ELEMENTS = 20;
public static final int LZX_ALIGNED_NUM_ELEMENTS = 8; /*
* aligned offset tree
* #elements
*/
public static final int LZX_NUM_PRIMARY_LENGTHS = 7; /*
* this one missing
* from spec!
*/
public static final int LZX_NUM_SECONDARY_LENGTHS = 249; /*
* length tree
* #elements
*/
/* LZX huffman defines: tweak tablebits as desired */
public static final int LZX_PRETREE_MAXSYMBOLS = LZX_PRETREE_NUM_ELEMENTS;
public static final int LZX_PRETREE_TABLEBITS = 6;
public static final int LZX_MAINTREE_MAXSYMBOLS = LZX_NUM_CHARS + 50 * 8;
public static final int LZX_MAIN_MAXSYMBOLS = LZX_NUM_CHARS * 2;
public static final int LZX_MAINTREE_TABLEBITS = 12;
public static final int LZX_LENGTH_MAXSYMBOLS = LZX_NUM_SECONDARY_LENGTHS + 1;
public static final int LZX_LENGTH_TABLEBITS = 12;
public static final int LZX_ALIGNED_MAXSYMBOLS = LZX_ALIGNED_NUM_ELEMENTS;
public static final int LZX_ALIGNED_TABLEBITS = 7;
public static final int LZX_LENTABLE_SAFETY = 64;
public static short[] EXTRA_BITS = { 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,
5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14,
15, 15, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
17, 17 };
public static int[] POSITION_BASE = { 0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32,
48, 64, 96, 128, 192, 256, 384, 512, 768, 1024, 1536, 2048, 3072,
4096, 6144, 8192, 12288, 16384, 24576, 32768, 49152, 65536, 98304,
131072, 196608, 262144, 393216, 524288, 655360, 786432, 917504,
1048576, 1179648, 1310720, 1441792, 1572864, 1703936, 1835008,
1966080, 2097152 };
}