1 /* 2 * Copyright (c) 2016, 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.elf; 27 28 import java.io.File; 29 import java.io.FileOutputStream; 30 31 final class ElfContainer { 32 33 private final File outputFile; 34 private FileOutputStream outputStream; 35 private long fileOffset; 36 37 ElfContainer(String fileName) { 38 39 outputFile = new File(fileName); 40 if (outputFile.exists()) { 41 outputFile.delete(); 42 } 43 44 try { 45 outputStream = new FileOutputStream(outputFile); 46 } catch (Exception e) { 47 System.out.println("ElfContainer: Can't create file " + fileName); 48 } 49 fileOffset = 0; 50 } 51 52 void close() { 53 try { 54 outputStream.close(); 55 } catch (Exception e) { 56 System.out.println("ElfContainer: close failed"); 57 } 58 } 59 60 void writeBytes(byte[] bytes) { 61 if (bytes == null) { 62 return; 63 } 64 try { 65 outputStream.write(bytes); 66 } catch (Exception e) { 67 System.out.println("ElfContainer: writeBytes failed"); 68 } 69 fileOffset += bytes.length; 70 } 71 72 // Write bytes to output file with up front alignment padding 73 void writeBytes(byte[] bytes, int alignment) { 74 if (bytes == null) { 75 return; 76 } 77 try { 78 // Pad to alignment 79 while ((fileOffset & (alignment - 1)) != 0) { 80 outputStream.write(0); 81 fileOffset++; 82 } 83 outputStream.write(bytes); 84 } catch (Exception e) { 85 System.out.println("ElfContainer: writeBytes failed"); 86 } 87 fileOffset += bytes.length; 88 } 89 }