[COMPRESS-706] Add support for reading LHA archive format

src/main/java/org/apache/commons/compress/archivers/ArchiveStreamFactory.java

@@ -37,6 +37,7 @@
 import org.apache.commons.compress.archivers.dump.DumpArchiveInputStream;
 import org.apache.commons.compress.archivers.jar.JarArchiveInputStream;
 import org.apache.commons.compress.archivers.jar.JarArchiveOutputStream;
+import org.apache.commons.compress.archivers.lha.LhaArchiveInputStream;
 import org.apache.commons.compress.archivers.sevenz.SevenZFile;
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
@@ -90,6 +91,8 @@ public class ArchiveStreamFactory implements ArchiveStreamProvider {
 
     private static final int DUMP_SIGNATURE_SIZE = 32;
 
+    private static final int LHA_SIGNATURE_SIZE = 22;
+
     private static final int SIGNATURE_SIZE = 12;
 
     /**
@@ -174,6 +177,13 @@ public class ArchiveStreamFactory implements ArchiveStreamProvider {
      */
     public static final String JAR = "jar";
 
+    /**
+     * Constant (value {@value}) used to identify the LHA archive format.
+     * Not supported as an output stream type.
+     * @since 1.29.0
+     */
+    public static final String LHA = "lha";
+
     /**
      * Constant used to identify the TAR archive format.
      *
@@ -255,6 +265,18 @@ public static String detect(final InputStream in) throws ArchiveException {
         if (DumpArchiveInputStream.matches(dumpsig, signatureLength)) {
             return DUMP;
         }
+        // LHA needs a bigger buffer to check the signature
+        final byte[] lhasig = new byte[LHA_SIGNATURE_SIZE];
+        in.mark(lhasig.length);
+        try {
+            signatureLength = IOUtils.readFully(in, lhasig);
+            in.reset();
+        } catch (final IOException e) {
+            throw new ArchiveException("IOException while reading LHA signature", (Throwable) e);
+        }
+        if (LhaArchiveInputStream.matches(lhasig, signatureLength)) {
+            return LHA;
+        }
         // Tar needs an even bigger buffer to check the signature; read the first block
         final byte[] tarHeader = new byte[TAR_HEADER_SIZE];
         in.mark(tarHeader.length);
@@ -439,6 +461,13 @@ public <I extends ArchiveInputStream<? extends ArchiveEntry>> I createArchiveInp
                 }
                 return (I) arjBuilder.get();
             }
+            if (LHA.equalsIgnoreCase(archiverName)) {
+                final LhaArchiveInputStream.Builder lhaBuilder = LhaArchiveInputStream.builder().setInputStream(in);
+                if (actualEncoding != null) {
+                    lhaBuilder.setCharset(actualEncoding);
+                }
+                return (I) lhaBuilder.get();
+            }
             if (ZIP.equalsIgnoreCase(archiverName)) {
                 final ZipArchiveInputStream.Builder zipBuilder = ZipArchiveInputStream.builder().setInputStream(in);
                 if (actualEncoding != null) {
@@ -593,7 +622,7 @@ public String getEntryEncoding() {
 
     @Override
     public Set<String> getInputStreamArchiveNames() {
-        return Sets.newHashSet(AR, ARJ, ZIP, TAR, JAR, CPIO, DUMP, SEVEN_Z);
+        return Sets.newHashSet(AR, ARJ, LHA, ZIP, TAR, JAR, CPIO, DUMP, SEVEN_Z);
     }
 
     @Override

src/main/java/org/apache/commons/compress/archivers/ArchiveStreamProvider.java

@@ -36,6 +36,7 @@ public interface ArchiveStreamProvider {
      * @param <I>          The {@link ArchiveInputStream} type.
      * @param archiverName the archiver name, i.e. {@value org.apache.commons.compress.archivers.ArchiveStreamFactory#AR},
      *                     {@value org.apache.commons.compress.archivers.ArchiveStreamFactory#ARJ},
+     *                     {@value org.apache.commons.compress.archivers.ArchiveStreamFactory#LHA},
      *                     {@value org.apache.commons.compress.archivers.ArchiveStreamFactory#ZIP},
      *                     {@value org.apache.commons.compress.archivers.ArchiveStreamFactory#TAR},
      *                     {@value org.apache.commons.compress.archivers.ArchiveStreamFactory#JAR},

src/main/java/org/apache/commons/compress/archivers/lha/CRC16.java

@@ -0,0 +1,94 @@
+/*
+ * 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
+ *
+ *   https://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.lha;
+
+import java.util.zip.Checksum;
+
+/**
+ * CRC-16 checksum implementation based on polynomial x^16 + x^15 + x^2 + 1 (0x8005) and
+ * the initial value 0x0000. This CRC variant is also known as CRC-16-MODBUS, CRC-16-IBM
+ * and CRC-16-ANSI.
+ */
+class CRC16 implements Checksum {
+    private static final int INITIAL_VALUE = 0x0000;
+
+    private static final int[] CRC16_TABLE = {
+        0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
+        0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
+        0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
+        0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
+        0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
+        0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
+        0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
+        0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
+        0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
+        0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
+        0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
+        0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
+        0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
+        0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
+        0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
+        0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
+        0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
+        0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
+        0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
+        0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
+        0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
+        0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
+        0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
+        0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
+        0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
+        0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
+        0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
+        0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
+        0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
+        0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
+        0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
+        0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
+    };
+
+    private int crc;
+
+    CRC16() {
+        reset();
+    }
+
+    @Override
+    public long getValue() {
+        return this.crc;
+    }
+
+    @Override
+    public void reset() {
+        this.crc = INITIAL_VALUE;
+    }
+
+    @Override
+    public void update(final int b) {
+        this.crc = (this.crc >>> 8) ^ CRC16_TABLE[(this.crc ^ b) & 0xff];
+    }
+
+    @Override
+    public void update(final byte[] b, final int off, final int len) {
+        for (int i = 0; i < len; i++) {
+            update(b[off + i]);
+        }
+    }
+}