| /* |
| * 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.apksigner.core.internal.jar; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| import java.util.jar.Attributes; |
| |
| /** |
| * Producer of {@code META-INF/MANIFEST.MF} file. |
| */ |
| public abstract class ManifestWriter { |
| |
| private static final byte[] CRLF = new byte[] {'\r', '\n'}; |
| private static final int MAX_LINE_LENGTH = 70; |
| |
| private ManifestWriter() {} |
| |
| public static void writeMainSection(OutputStream out, Attributes attributes) |
| throws IOException { |
| |
| // Main section must start with the Manifest-Version attribute. |
| // See https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File. |
| String manifestVersion = attributes.getValue(Attributes.Name.MANIFEST_VERSION); |
| if (manifestVersion == null) { |
| throw new IllegalArgumentException( |
| "Mandatory " + Attributes.Name.MANIFEST_VERSION + " attribute missing"); |
| } |
| writeAttribute(out, Attributes.Name.MANIFEST_VERSION, manifestVersion); |
| |
| if (attributes.size() > 1) { |
| SortedMap<String, String> namedAttributes = getAttributesSortedByName(attributes); |
| namedAttributes.remove(Attributes.Name.MANIFEST_VERSION.toString()); |
| writeAttributes(out, namedAttributes); |
| } |
| writeSectionDelimiter(out); |
| } |
| |
| public static void writeIndividualSection(OutputStream out, String name, Attributes attributes) |
| throws IOException { |
| writeAttribute(out, "Name", name); |
| |
| if (!attributes.isEmpty()) { |
| writeAttributes(out, getAttributesSortedByName(attributes)); |
| } |
| writeSectionDelimiter(out); |
| } |
| |
| static void writeSectionDelimiter(OutputStream out) throws IOException { |
| out.write(CRLF); |
| } |
| |
| static void writeAttribute(OutputStream out, Attributes.Name name, String value) |
| throws IOException { |
| writeAttribute(out, name.toString(), value); |
| } |
| |
| private static void writeAttribute(OutputStream out, String name, String value) |
| throws IOException { |
| writeLine(out, name + ": " + value); |
| } |
| |
| private static void writeLine(OutputStream out, String line) throws IOException { |
| byte[] lineBytes = line.getBytes("UTF-8"); |
| int offset = 0; |
| int remaining = lineBytes.length; |
| boolean firstLine = true; |
| while (remaining > 0) { |
| int chunkLength; |
| if (firstLine) { |
| // First line |
| chunkLength = Math.min(remaining, MAX_LINE_LENGTH); |
| } else { |
| // Continuation line |
| out.write(CRLF); |
| out.write(' '); |
| chunkLength = Math.min(remaining, MAX_LINE_LENGTH - 1); |
| } |
| out.write(lineBytes, offset, chunkLength); |
| offset += chunkLength; |
| remaining -= chunkLength; |
| firstLine = false; |
| } |
| out.write(CRLF); |
| } |
| |
| static SortedMap<String, String> getAttributesSortedByName(Attributes attributes) { |
| Set<Map.Entry<Object, Object>> attributesEntries = attributes.entrySet(); |
| SortedMap<String, String> namedAttributes = new TreeMap<String, String>(); |
| for (Map.Entry<Object, Object> attribute : attributesEntries) { |
| String attrName = attribute.getKey().toString(); |
| String attrValue = attribute.getValue().toString(); |
| namedAttributes.put(attrName, attrValue); |
| } |
| return namedAttributes; |
| } |
| |
| static void writeAttributes( |
| OutputStream out, SortedMap<String, String> attributesSortedByName) throws IOException { |
| for (Map.Entry<String, String> attribute : attributesSortedByName.entrySet()) { |
| String attrName = attribute.getKey(); |
| String attrValue = attribute.getValue(); |
| writeAttribute(out, attrName, attrValue); |
| } |
| } |
| } |