/*
 * Copyright 2012, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.jf.dexlib2;

import com.google.common.io.ByteStreams;
import org.jf.dexlib2.dexbacked.DexBackedDexFile;
import org.jf.dexlib2.dexbacked.DexBackedOdexFile;
import org.jf.dexlib2.iface.DexFile;
import org.jf.dexlib2.writer.pool.DexPool;
import org.jf.util.ExceptionWithContext;

import javax.annotation.Nonnull;
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public final class DexFileFactory {
    @Nonnull
    public static DexBackedDexFile loadDexFile(String path, int api) throws IOException {
        return loadDexFile(new File(path), new Opcodes(api));
    }

    @Nonnull
    public static DexBackedDexFile loadDexFile(File dexFile, int api) throws IOException {
        return loadDexFile(dexFile, new Opcodes(api));
    }

    @Nonnull
    public static DexBackedDexFile loadDexFile(File dexFile, @Nonnull Opcodes opcodes) throws IOException {
        ZipFile zipFile = null;
        boolean isZipFile = false;
        try {
            zipFile = new ZipFile(dexFile);
            // if we get here, it's safe to assume we have a zip file
            isZipFile = true;

            ZipEntry zipEntry = zipFile.getEntry("classes.dex");
            if (zipEntry == null) {
                throw new NoClassesDexException("zip file %s does not contain a classes.dex file", dexFile.getName());
            }
            long fileLength = zipEntry.getSize();
            if (fileLength < 40) {
                throw new ExceptionWithContext(
                        "The classes.dex file in %s is too small to be a valid dex file", dexFile.getName());
            } else if (fileLength > Integer.MAX_VALUE) {
                throw new ExceptionWithContext("The classes.dex file in %s is too large to read in", dexFile.getName());
            }
            byte[] dexBytes = new byte[(int)fileLength];
            ByteStreams.readFully(zipFile.getInputStream(zipEntry), dexBytes);
            return new DexBackedDexFile(opcodes, dexBytes);
        } catch (IOException ex) {
            // don't continue on if we know it's a zip file
            if (isZipFile) {
                throw ex;
            }
        } finally {
            if (zipFile != null) {
                try {
                    zipFile.close();
                } catch (IOException ex) {
                    // just eat it
                }
            }
        }

        InputStream inputStream = new BufferedInputStream(new FileInputStream(dexFile));

        try {
            return DexBackedDexFile.fromInputStream(opcodes, inputStream);
        } catch (DexBackedDexFile.NotADexFile ex) {
            // just eat it
        }

        // Note: DexBackedDexFile.fromInputStream will reset inputStream back to the same position, if it fails

        try {
            return DexBackedOdexFile.fromInputStream(opcodes, inputStream);
        } catch (DexBackedOdexFile.NotAnOdexFile ex) {
            // just eat it
        }

        throw new ExceptionWithContext("%s is not an apk, dex file or odex file.", dexFile.getPath());
    }

    public static void writeDexFile(String path, DexFile dexFile) throws IOException {
        DexPool.writeTo(path, dexFile);
    }

    private DexFileFactory() {}

    public static class NoClassesDexException extends ExceptionWithContext {
        public NoClassesDexException(Throwable cause) {
            super(cause);
        }

        public NoClassesDexException(Throwable cause, String message, Object... formatArgs) {
            super(cause, message, formatArgs);
        }

        public NoClassesDexException(String message, Object... formatArgs) {
            super(message, formatArgs);
        }
    }
}

@@ -2140,16 +2140,31 @@
 e(path),
+ %22classes.dex%22,
  new Opc
@@ -2321,16 +2321,31 @@
 dexFile,
+ %22classes.dex%22,
  new Opc
@@ -2436,16 +2436,226 @@
 dexFile,
+ String dexEntry, int api) throws IOException %7B%0A        return loadDexFile(dexFile, dexEntry, new Opcodes(api));%0A    %7D%0A%0A    @Nonnull%0A    public static DexBackedDexFile loadDexFile(File dexFile, String filename,
  @Nonnul
@@ -2969,29 +2969,24 @@
 etEntry(
-%22classes.dex%22
+filename
 );%0A     
@@ -3307,35 +3307,40 @@
        %22The 
-classes.dex
+%22 + filename + %22
  file in %25s 
@@ -3506,27 +3506,32 @@
 xt(%22The 
-classes.dex
+%22 + filename + %22
  file in

allow disassemble of apks with non classes.dex files