1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 
  26 package jdk.tools.jaotc.binformat.pecoff;
  27 
  28 import java.nio.ByteBuffer;
  29 
  30 import jdk.tools.jaotc.binformat.pecoff.PECoff.IMAGE_FILE_HEADER;
  31 
  32 final class PECoffHeader {
  33     private final ByteBuffer header;
  34 
  35     PECoffHeader() {
  36         header = PECoffByteBuffer.allocate(IMAGE_FILE_HEADER.totalsize);
  37 
  38         header.putChar(IMAGE_FILE_HEADER.Machine.off, IMAGE_FILE_HEADER.IMAGE_FILE_MACHINE_AMD64);
  39         header.putInt(IMAGE_FILE_HEADER.TimeDateStamp.off, (int) (System.currentTimeMillis() / 1000));
  40         header.putInt(IMAGE_FILE_HEADER.PointerToSymbolTable.off, 0);
  41         header.putInt(IMAGE_FILE_HEADER.NumberOfSymbols.off, 0);
  42         header.putChar(IMAGE_FILE_HEADER.SizeOfOptionalHeader.off, (char) 0);
  43         header.putChar(IMAGE_FILE_HEADER.Characteristics.off, (char) 0);
  44 
  45     }
  46 
  47     // Update header with the number of total sections
  48     void setSectionCount(int count) {
  49         header.putChar(IMAGE_FILE_HEADER.NumberOfSections.off, (char) count);
  50     }
  51 
  52     // Update header with the number of total symbols
  53     void setSymbolCount(int count) {
  54         header.putInt(IMAGE_FILE_HEADER.NumberOfSymbols.off, count);
  55     }
  56 
  57     // Update header with the offset of symbol table
  58     void setSymbolOff(int offset) {
  59         header.putInt(IMAGE_FILE_HEADER.PointerToSymbolTable.off, offset);
  60     }
  61 
  62     byte[] getArray() {
  63         return header.array();
  64     }
  65 }