51 lines
2.1 KiB
Java
51 lines
2.1 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.poifs.storage;
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import org.apache.poi.poifs.common.POIFSConstants;
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import org.apache.poi.util.LittleEndianConsts;
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/**
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* Constants used in reading/writing the Header block
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*
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* @author Marc Johnson (mjohnson at apache dot org)
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*/
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public interface HeaderBlockConstants
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{
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public static final long _signature = 0xE11AB1A1E011CFD0L;
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public static final int _bat_array_offset = 0x4c;
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public static final int _max_bats_in_header =
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(POIFSConstants.SMALLER_BIG_BLOCK_SIZE - _bat_array_offset)
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/ LittleEndianConsts.INT_SIZE; // If 4k blocks, rest is blank
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// Note - in Microsoft terms:
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// BAT ~= FAT
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// SBAT ~= MiniFAT
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// XBAT ~= DIFat
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// useful offsets
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public static final int _signature_offset = 0;
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public static final int _bat_count_offset = 0x2C;
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public static final int _property_start_offset = 0x30;
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public static final int _sbat_start_offset = 0x3C;
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public static final int _sbat_block_count_offset = 0x40;
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public static final int _xbat_start_offset = 0x44;
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public static final int _xbat_count_offset = 0x48;
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} // end public interface HeaderBlockConstants
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