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/*
* Licensed 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 ai.vespa.airlift.zstd;
import java.util.Arrays;
class BlockCompressionState
{
public final int[] hashTable;
public final int[] chainTable;
private final long baseAddress;
// starting point of the window with respect to baseAddress
private int windowBaseOffset;
public BlockCompressionState(CompressionParameters parameters, long baseAddress)
{
this.baseAddress = baseAddress;
hashTable = new int[1 << parameters.getHashLog()];
chainTable = new int[1 << parameters.getChainLog()]; // TODO: chain table not used by Strategy.FAST
}
public void reset()
{
Arrays.fill(hashTable, 0);
Arrays.fill(chainTable, 0);
}
public void enforceMaxDistance(long inputLimit, int maxDistance)
{
int distance = (int) (inputLimit - baseAddress);
int newOffset = distance - maxDistance;
if (windowBaseOffset < newOffset) {
windowBaseOffset = newOffset;
}
}
public long getBaseAddress()
{
return baseAddress;
}
public int getWindowBaseOffset()
{
return windowBaseOffset;
}
}
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