1 /*
2 * Copyright 2016 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty5.handler.codec.compression;
17
18 import io.netty5.buffer.api.Buffer;
19
20
21 final class CompressionUtil {
22
23 private CompressionUtil() { }
24
25 static void checkChecksum(BufferChecksum checksum, Buffer uncompressed, int currentChecksum) {
26 checksum.reset();
27 checksum.update(uncompressed,
28 uncompressed.readerOffset(), uncompressed.readableBytes());
29
30 final int checksumResult = (int) checksum.getValue();
31 if (checksumResult != currentChecksum) {
32 throw new DecompressionException(String.format(
33 "stream corrupted: mismatching checksum: %d (expected: %d)",
34 checksumResult, currentChecksum));
35 }
36 }
37 }