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/** Copyright (c) 2010 Scott A. Crosby. <scott@sacrosby.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package crosby.binary.file;
import com.google.protobuf.ByteString;
/**
* Base class that contains the metadata about a fileblock.
*
* Subclasses of this include additional fields, such as byte offsets that let a
* fileblock be read in a random-access fashion, or the data itself.
*
* @author crosby
*
*/
public class FileBlockBase {
/** If a block header is bigger than this, fail. We use excessively large header size as an indication of corrupt files */
static final int MAX_HEADER_SIZE = 64*1024;
/** If a block's size is bigger than this, fail. We use excessively large block sizes as an indication of corrupt files */
static final int MAX_BODY_SIZE = 32*1024*1024;
protected FileBlockBase(String type, ByteString indexdata) {
this.type = type;
this.indexdata = indexdata;
}
/** Identifies the type of the data within a block */
protected final String type;
/**
* Block metadata, stored in the index block and as a prefix for every
* block.
*/
protected final ByteString indexdata;
public String getType() {
return type;
}
public ByteString getIndexData() {
return indexdata;
}
}
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