1 files changed, 120 insertions, 0 deletions
diff --git a/library/test/src/androidx/multidex/ZipEntryReader.java b/library/test/src/androidx/multidex/ZipEntryReader.java
new file mode 100644
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--- /dev/null
+++ b/library/test/src/androidx/multidex/ZipEntryReader.java
@@ -0,0 +1,120 @@
+/*
+ * 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.
+ */
+/* Apache Harmony HEADER because the code in this class comes mostly from ZipFile, ZipEntry and
+ * ZipConstants from android libcore.
+ */
+
+package androidx.multidex;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipException;
+
+class ZipEntryReader {
+    static final Charset UTF_8 = Charset.forName("UTF-8");
+   /**
+     * General Purpose Bit Flags, Bit 0.
+     * If set, indicates that the file is encrypted.
+     */
+    private static final int GPBF_ENCRYPTED_FLAG = 1 << 0;
+
+    /**
+     * Supported General Purpose Bit Flags Mask.
+     * Bit mask of bits not supported.
+     * Note: The only bit that we will enforce at this time
+     * is the encrypted bit. Although other bits are not supported,
+     * we must not enforce them as this could break some legitimate
+     * use cases (See http://b/8617715).
+     */
+    private static final int GPBF_UNSUPPORTED_MASK = GPBF_ENCRYPTED_FLAG;
+    private static final long CENSIG = 0x2014b50;
+
+    static ZipEntry readEntry(ByteBuffer in) throws IOException {
+
+        int sig = in.getInt();
+        if (sig != CENSIG) {
+             throw new ZipException("Central Directory Entry not found");
+        }
+
+        in.position(8);
+        int gpbf = in.getShort() & 0xffff;
+
+        if ((gpbf & GPBF_UNSUPPORTED_MASK) != 0) {
+            throw new ZipException("Invalid General Purpose Bit Flag: " + gpbf);
+        }
+
+        int compressionMethod = in.getShort() & 0xffff;
+        int time = in.getShort() & 0xffff;
+        int modDate = in.getShort() & 0xffff;
+
+        // These are 32-bit values in the file, but 64-bit fields in this object.
+        long crc = ((long) in.getInt()) & 0xffffffffL;
+        long compressedSize = ((long) in.getInt()) & 0xffffffffL;
+        long size = ((long) in.getInt()) & 0xffffffffL;
+
+        int nameLength = in.getShort() & 0xffff;
+        int extraLength = in.getShort() & 0xffff;
+        int commentByteCount = in.getShort() & 0xffff;
+
+        // This is a 32-bit value in the file, but a 64-bit field in this object.
+        in.position(42);
+        long localHeaderRelOffset = ((long) in.getInt()) & 0xffffffffL;
+
+        byte[] nameBytes = new byte[nameLength];
+        in.get(nameBytes, 0, nameBytes.length);
+        String name = new String(nameBytes, 0, nameBytes.length, UTF_8);
+
+        ZipEntry entry = new ZipEntry(name);
+        entry.setMethod(compressionMethod);
+        entry.setTime(getTime(time, modDate));
+
+        entry.setCrc(crc);
+        entry.setCompressedSize(compressedSize);
+        entry.setSize(size);
+
+        // The RI has always assumed UTF-8. (If GPBF_UTF8_FLAG isn't set, the encoding is
+        // actually IBM-437.)
+        if (commentByteCount > 0) {
+            byte[] commentBytes = new byte[commentByteCount];
+            in.get(commentBytes, 0, commentByteCount);
+            entry.setComment(new String(commentBytes, 0, commentBytes.length, UTF_8));
+        }
+
+        if (extraLength > 0) {
+            byte[] extra = new byte[extraLength];
+            in.get(extra, 0, extraLength);
+            entry.setExtra(extra);
+        }
+
+        return entry;
+
+    }
+
+    private static long getTime(int time, int modDate) {
+        GregorianCalendar cal = new GregorianCalendar();
+        cal.set(Calendar.MILLISECOND, 0);
+        cal.set(1980 + ((modDate >> 9) & 0x7f), ((modDate >> 5) & 0xf) - 1,
+                modDate & 0x1f, (time >> 11) & 0x1f, (time >> 5) & 0x3f,
+                (time & 0x1f) << 1);
+        return cal.getTime().getTime();
+    }
+
+}