49 lines
1.8 KiB
Java
49 lines
1.8 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.compression;
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import io.netty.buffer.ByteBuf;
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import java.nio.ByteBuffer;
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final class CompressionUtil {
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private CompressionUtil() { }
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static void checkChecksum(ByteBufChecksum checksum, ByteBuf uncompressed, int currentChecksum) {
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checksum.reset();
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checksum.update(uncompressed,
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uncompressed.readerIndex(), uncompressed.readableBytes());
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final int checksumResult = (int) checksum.getValue();
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if (checksumResult != currentChecksum) {
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throw new DecompressionException(String.format(
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"stream corrupted: mismatching checksum: %d (expected: %d)",
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checksumResult, currentChecksum));
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}
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}
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static ByteBuffer safeNioBuffer(ByteBuf buffer) {
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return buffer.nioBufferCount() == 1 ? buffer.internalNioBuffer(buffer.readerIndex(), buffer.readableBytes())
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: buffer.nioBuffer();
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}
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static ByteBuffer safeNioBuffer(ByteBuf buffer, int index, int length) {
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return buffer.nioBufferCount() == 1 ? buffer.internalNioBuffer(index, length)
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: buffer.nioBuffer(index, length);
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}
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}
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