/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012-2015 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.bck2brwsr.emul.zip;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.zip.ZipEntry;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 final class ZipArchive {

     private Entry first;

     public static ZipArchive createZip(InputStream is) throws IOException {

         ZipArchive a = new ZipArchive();

         readZip(is, a);

         return a;

     }

     public static ZipArchive createReal(InputStream is) throws IOException {

         ZipArchive a = new ZipArchive();

         realZip(is, a);

         return a;

     }

     /**

      * Registers entry name and data

      */

     final void register(String entry, InputStream is) throws IOException {

         byte[] arr = new byte[12 * 4096];

         for (int i = 0; i < arr.length; i++) {

             int ch = is.read();

             if (ch == -1) {

                 byte[] tmp = new byte[i];

                 FastJar.arraycopy(arr, 0, tmp, 0, i);

                 arr = tmp;

                 break;

             }

             arr[i] = (byte) ch;

         }

         first = new Entry (entry, arr, first);

     }

     @Override

     public String toString() {

         StringBuilder sb = new StringBuilder();

         Entry e = first;

         while (e != null) {

             String string = e.name;

             byte[] bs = e.arr;

             sb.append(string).append(" = ").append(toString(bs)).append("\n");

             e = e.next;

         }

         return sb.toString();

     }

     public void assertEquals(ZipArchive zip, String msg) {

         boolean ok = true;

         StringBuilder sb = new StringBuilder();

         sb.append(msg);

         Entry e = first;

         while (e != null) {

             String string = e.name;

             byte[] bs = e.arr;

             byte[] other = zip.find(string);

             e = e.next;

             sb.append("\n");

             if (other == null) {

                 sb.append("EXTRA ").append(string).append(" = ").append(toString(bs));

                 ok = false;

                 continue;

             }

             if (equals(bs, other)) {

                 sb.append("OK    ").append(string);

                 continue;

             } else {

                 sb.append("DIFF  ").append(string).append(" = ").append(toString(bs)).append("\n");

                 sb.append("    TO").append(string).append(" = ").append(toString(other)).append("\n");

                 ok = false;

                 continue;

             }

         }

         e = zip.first;

         while (e != null) {

             String string = e.name;

             if (find(string) == null) {

                 sb.append("MISS  ").append(string).append(" = ").append(toString(e.arr));

                 ok = false;

             }

             e = e.next;

         }

         if (!ok) {

             assert false : sb.toString();

         }

     }

     public static void readZip(InputStream is, ZipArchive data) throws IOException {

         ZipInputStream zip = new org.apidesign.bck2brwsr.emul.zip.ZipInputStream(is);

         for (;;) {

             ZipEntry en = zip.getNextEntry();

             if (en == null) {

                 return;

             }

             data.register(en.getName(), zip);

         }

     }

     public static void realZip(InputStream is, ZipArchive data) throws IOException {

         java.util.zip.ZipInputStream zip = new java.util.zip.ZipInputStream(is);

         for (;;) {

             ZipEntry en = zip.getNextEntry();

             if (en == null) {

                 return;

             }

             data.register(en.getName(), zip);

         }

     }

     private byte[] find(String name) {

         Entry e = first;

         while (e != null) {

             if (e.name.equals(name)) {

                 return e.arr;

             }

             e = e.next;

         }

         return null;

     }

     private boolean equals(byte[] bs, byte[] other) {

         if (bs.length != other.length) {

             return false;

         }

         for (int i = 0; i < bs.length; i++) {

             if (bs[i] != other[i]) {

                 return false;

             }

         }

         return true;

     }

     private Object toString(byte[] arr) {

         StringBuilder sb = new StringBuilder();

         sb.append("[");

         String sep = "";

         for (int i = 0; i < arr.length; i++) {

             sb.append(sep).append(arr[i]);

             sep = ", ";

         }

         sb.append("]");

         return sb.toString();

     }

     private static final class Entry {

         final String name;

         final byte[] arr;

         final Entry next;

         public Entry(String name, byte[] arr, Entry next) {

             this.name = name;

             this.arr = arr;

             this.next = next;

         }

     }

 }