content: /*
   * Copyright (C) 2016 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.android.apksig.internal.jar;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.SortedMap;
  import java.util.jar.Attributes;
  
  /**
   * Producer of JAR signature file ({@code *.SF}).
   *
   * @see <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#JAR_Manifest">JAR Manifest format</a>
   */
  public abstract class SignatureFileWriter {
      private SignatureFileWriter() {}
  
      public static void writeMainSection(OutputStream out, Attributes attributes)
              throws IOException {
  
          // Main section must start with the Signature-Version attribute.
          // See https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File.
          String signatureVersion = attributes.getValue(Attributes.Name.SIGNATURE_VERSION);
          if (signatureVersion == null) {
              throw new IllegalArgumentException(
                      "Mandatory " + Attributes.Name.SIGNATURE_VERSION + " attribute missing");
          }
          ManifestWriter.writeAttribute(out, Attributes.Name.SIGNATURE_VERSION, signatureVersion);
  
          if (attributes.size() > 1) {
              SortedMap<String, String> namedAttributes =
                      ManifestWriter.getAttributesSortedByName(attributes);
              namedAttributes.remove(Attributes.Name.SIGNATURE_VERSION.toString());
              ManifestWriter.writeAttributes(out, namedAttributes);
          }
          writeSectionDelimiter(out);
      }
  
      public static void writeIndividualSection(OutputStream out, String name, Attributes attributes)
              throws IOException {
          ManifestWriter.writeIndividualSection(out, name, attributes);
      }
  
      public static void writeSectionDelimiter(OutputStream out) throws IOException {
          ManifestWriter.writeSectionDelimiter(out);
      }
  }
  