content: /*
   * Copyright (C) 2007 The Android Open Source Project
   *
   * Licensed 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 com.taobao.android.dx.dex.file;
  
  import com.taobao.android.dex.DexFormat;
  import com.taobao.android.dex.SizeOf;
  import com.taobao.android.dx.rop.cst.CstString;
  import com.taobao.android.dx.util.AnnotatedOutput;
  import com.taobao.android.dx.util.Hex;
  
  /**
   * File header section of a {@code .dex} file.
   */
  public final class HeaderItem extends IndexedItem {
      /**
       * Constructs an instance.
       */
      public HeaderItem() {
          // This space intentionally left blank.
      }
  
      /** {@inheritDoc} */
      @Override
      public ItemType itemType() {
          return ItemType.TYPE_HEADER_ITEM;
      }
  
      /** {@inheritDoc} */
      @Override
      public int writeSize() {
          return SizeOf.HEADER_ITEM;
      }
  
      /** {@inheritDoc} */
      @Override
      public void addContents(DexFile file) {
          // Nothing to do here.
      }
  
      /** {@inheritDoc} */
      @Override
      public void writeTo(DexFile file, AnnotatedOutput out) {
          int mapOff = file.getMap().getFileOffset();
          Section firstDataSection = file.getFirstDataSection();
          Section lastDataSection = file.getLastDataSection();
          int dataOff = firstDataSection.getFileOffset();
          int dataSize = lastDataSection.getFileOffset() +
              lastDataSection.writeSize() - dataOff;
  
          String magic = file.getDexOptions().getMagic();
  
          if (out.annotates()) {
              out.annotate(8, "magic: " + new CstString(magic).toQuoted());
              out.annotate(4, "checksum");
              out.annotate(20, "signature");
              out.annotate(4, "file_size:       " +
                           Hex.u4(file.getFileSize()));
              out.annotate(4, "header_size:     " + Hex.u4(SizeOf.HEADER_ITEM));
              out.annotate(4, "endian_tag:      " + Hex.u4(DexFormat.ENDIAN_TAG));
              out.annotate(4, "link_size:       0");
              out.annotate(4, "link_off:        0");
              out.annotate(4, "map_off:         " + Hex.u4(mapOff));
          }
  
          // Write the magic number.
          for (int i = 0; i < 8; i++) {
              out.writeByte(magic.charAt(i));
          }
  
          // Leave space for the checksum and signature.
          out.writeZeroes(24);
  
          out.writeInt(file.getFileSize());
          out.writeInt(SizeOf.HEADER_ITEM);
          out.writeInt(DexFormat.ENDIAN_TAG);
  
          /*
           * Write zeroes for the link size and data, as the output
           * isn't a staticly linked file.
           */
          out.writeZeroes(8);
  
          out.writeInt(mapOff);
  
          // Write out each section's respective header part.
          file.getStringIds().writeHeaderPart(out);
          file.getTypeIds().writeHeaderPart(out);
          file.getProtoIds().writeHeaderPart(out);
          file.getFieldIds().writeHeaderPart(out);
          file.getMethodIds().writeHeaderPart(out);
          file.getClassDefs().writeHeaderPart(out);
  
          if (out.annotates()) {
              out.annotate(4, "data_size:       " + Hex.u4(dataSize));
              out.annotate(4, "data_off:        " + Hex.u4(dataOff));
          }
  
          out.writeInt(dataSize);
          out.writeInt(dataOff);
      }
  }
  