content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.itsaky.androidide.javac.services;
  
  import static openjdk.tools.javac.jvm.ClassFile.Version.V45_3;
  
  import android.text.TextUtils;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Arrays;
  import java.util.Set;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import jdkx.tools.ForwardingJavaFileObject;
  import jdkx.tools.JavaFileObject;
  import openjdk.tools.javac.code.ClassFinder.BadClassFile;
  import openjdk.tools.javac.code.Symbol;
  import openjdk.tools.javac.code.Symbol.ClassSymbol;
  import openjdk.tools.javac.jvm.ClassFile;
  import openjdk.tools.javac.jvm.ClassFile.Version;
  import openjdk.tools.javac.jvm.ClassReader;
  import openjdk.tools.javac.resources.CompilerProperties.Warnings;
  import openjdk.tools.javac.util.Context;
  import openjdk.tools.javac.util.Log;
  import openjdk.tools.javac.util.Name;
  import org.slf4j.LoggerFactory;
  
  /**
   * @author lahvac
   */
  public class NBClassReader extends ClassReader {
  
    private static final org.slf4j.Logger LOG = LoggerFactory.getLogger(NBClassReader.class);
    private final NBNames nbNames;
    private final Log log;
  
    public static void preRegister(Context context) {
      context.put(classReaderKey, (Context.Factory<ClassReader>) NBClassReader::new);
    }
  
    public NBClassReader(Context context) {
      super(context);
  
      nbNames = NBNames.instance(context);
      log = Log.instance(context);
  
      NBAttributeReader[] readers = {
          new NBAttributeReader(
              nbNames._org_netbeans_EnclosingMethod, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
            public void read(Symbol sym, int attrLen) {
              int newbp = bp + attrLen;
              readEnclosingMethodAttr(sym);
              bp = newbp;
            }
          },
      };
  
      for (NBAttributeReader r : readers) {
        attributeReaders.put(r.getName(), r);
      }
    }
  
    @Override
    public BadClassFile badClassFile(final String key, final Object... args) {
      LOG.debug("Bad class file {} {}", key, TextUtils.join(", ", args), new RuntimeException());
      return super.badClassFile(key, args);
    }
  
    @Override
    public void readClassFile(ClassSymbol c) {
      try {
        super.readClassFile(c);
      } catch (BadClassFile cf) {
        if ("compiler.misc.bad.class.file.header".equals(cf.getDiagnostic().getCode())) {
          JavaFileObject origFile = c.classfile;
          try (InputStream in = origFile.openInputStream()) {
            byte[] data = readFile(in);
            int major = (Byte.toUnsignedInt(data[6]) << 8) + Byte.toUnsignedInt(data[7]);
            int maxMajor = ClassFile.Version.MAX().major;
            if (maxMajor < major) {
              if (log.currentSourceFile() != null) {
                log.warning(0, Warnings.BigMajorVersion(origFile, major, maxMajor));
              }
              data[6] = (byte) (maxMajor >> 8);
              data[7] = (byte) (maxMajor & 0xFF);
              c.classfile =
                  new ForwardingJavaFileObject<JavaFileObject>(origFile) {
                    @Override
                    public InputStream openInputStream() {
                      return new ByteArrayInputStream(data);
                    }
                  };
              super.readClassFile(c);
              return;
            }
          } catch (IOException ex) {
            Logger.getLogger(NBClassReader.class.getName()).log(Level.FINE, null, ex);
          } finally {
            c.classfile = origFile;
          }
        }
        throw cf;
      }
    }
  
    static byte[] readFile(final InputStream in) throws IOException {
      byte[] data = new byte[Math.max(in.available(), 256)];
      int off = 0;
      int read;
      while ((read = in.read(data, off, data.length - off)) != (-1)) {
        off += read;
        if (data.length == off) {
          data = Arrays.copyOf(data, 2 * (data.length + in.available()));
        }
      }
      return Arrays.copyOf(data, off);
    }
  
    private abstract class NBAttributeReader extends AttributeReader {
  
      private NBAttributeReader(Name name, Version version, Set<AttributeKind> kinds) {
        super(name, version, kinds);
      }
  
      private Name getName() {
        return name;
      }
    }
  }
  