[
https://issues.apache.org/jira/browse/COMPRESS-514?focusedWorklogId=433593&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-433593
]
ASF GitHub Bot logged work on COMPRESS-514:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 15/May/20 08:16
Start Date: 15/May/20 08:16
Worklog Time Spent: 10m
Work Description: akelday commented on a change in pull request #98:
URL: https://github.com/apache/commons-compress/pull/98#discussion_r425640169
##########
File path:
src/main/java/org/apache/commons/compress/archivers/sevenz/HeaderChannelBuffer.java
##########
@@ -0,0 +1,173 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.commons.compress.archivers.sevenz;
+
+import org.apache.commons.compress.utils.IOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.BufferUnderflowException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+import java.util.zip.CRC32;
+
+/**
+ * Enables little-endian primitive type reads from a {@link
ReadableByteChannel}
+ * or {@link InputStream}, internally using a paged-in {@link ByteBuffer}.
+ * <br>
+ * Access is serial only but does allow a
+ * virtual buffer capacity of {@code Long.MAX_VALUE}.
+ * If the requested capacity is within the maximum page size (default 16MiB)
+ * the buffer will be fully read and held in a {@link HeaderInMemoryBuffer}.
+ *
+ * @NotThreadSafe
+ * @since 1.21
+ */
+class HeaderChannelBuffer implements HeaderBuffer {
+ private static final int DEFAULT_PAGE_MAX = 16_777_216;
+ // This must match the largest get<Element> (currently getLong)
+ private static final int MAX_GET_ELEMENT_SIZE = 8;
+ private final ReadableByteChannel channel;
+ private final ByteBuffer buffer;
+ private long remaining;
+
+ private HeaderChannelBuffer(final ReadableByteChannel channel, final long
capacity, final int maxPageBytes) {
+ this.channel = channel;
+ this.buffer =
ByteBuffer.allocate(maxPageBytes).order(ByteOrder.LITTLE_ENDIAN);
Review comment:
Good point, easier to understand as well. Done.
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Issue Time Tracking
-------------------
Worklog Id: (was: 433593)
Time Spent: 20m (was: 10m)
> SevenZFile fails with encoded header over 2GiB
> ----------------------------------------------
>
> Key: COMPRESS-514
> URL: https://issues.apache.org/jira/browse/COMPRESS-514
> Project: Commons Compress
> Issue Type: Bug
> Components: Archivers
> Affects Versions: 1.20
> Reporter: A Kelday
> Priority: Minor
> Attachments: HeaderChannelBuffer.java
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When reading what some may call a large encrypted 7zip file (1.2TB with 22
> million files), the read fails at the header stage with the trace below. Is
> this within the spec? I've written some code to handle it, because I did
> actually need to extract the file in java. If that's of any use I can provide
> it (it's a naive wrapper that just pages in a buffer at a time).
>
> {code:java}
> Exception in thread "main" java.io.IOException: Cannot handle
> unpackSize2416988886
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.assertFitsIntoInt(SevenZFile.java:1523)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.readEncodedHeader(SevenZFile.java:622)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.initializeArchive(SevenZFile.java:532)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.readHeaders(SevenZFile.java:468)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:337)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:129)
> at
> org.apache.commons.compress.archivers.sevenz.SevenZFile.<init>(SevenZFile.java:116)
> {code}
> 7zip itself can also open it (and display/extract etc.), here are the stats:
>
>
> {code:java}
> Size: 2 489 903 580 875
> Packed Size: 1 349 110 308 832
> Folders: 40 005
> Files: 22 073 957
> CRC: E26F6A96
> {code}
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