1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.apksig.internal.jar; 18 19 import java.io.IOException; 20 import java.io.OutputStream; 21 import java.util.SortedMap; 22 import java.util.jar.Attributes; 23 24 /** 25 * Producer of JAR signature file ({@code *.SF}). 26 * 27 * @see <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#JAR_Manifest">JAR Manifest format</a> 28 */ 29 public abstract class SignatureFileWriter { 30 private SignatureFileWriter() {} 31 32 public static void writeMainSection(OutputStream out, Attributes attributes) 33 throws IOException { 34 35 // Main section must start with the Signature-Version attribute. 36 // See https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File. 37 String signatureVersion = attributes.getValue(Attributes.Name.SIGNATURE_VERSION); 38 if (signatureVersion == null) { 39 throw new IllegalArgumentException( 40 "Mandatory " + Attributes.Name.SIGNATURE_VERSION + " attribute missing"); 41 } 42 ManifestWriter.writeAttribute(out, Attributes.Name.SIGNATURE_VERSION, signatureVersion); 43 44 if (attributes.size() > 1) { 45 SortedMap<String, String> namedAttributes = 46 ManifestWriter.getAttributesSortedByName(attributes); 47 namedAttributes.remove(Attributes.Name.SIGNATURE_VERSION.toString()); 48 ManifestWriter.writeAttributes(out, namedAttributes); 49 } 50 writeSectionDelimiter(out); 51 } 52 53 public static void writeIndividualSection(OutputStream out, String name, Attributes attributes) 54 throws IOException { 55 ManifestWriter.writeIndividualSection(out, name, attributes); 56 } 57 58 public static void writeSectionDelimiter(OutputStream out) throws IOException { 59 ManifestWriter.writeSectionDelimiter(out); 60 } 61 } 62
