content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import com.google.protobuf.ArrayDecoders.Registers;
  import java.io.IOException;
  import junit.framework.TestCase;
  
  public class ArrayDecodersTest extends TestCase {
  
    private static final int TAG = WireFormat.makeTag(1, WireFormat.WIRETYPE_LENGTH_DELIMITED);
    private static final ByteString NEGATIVE_SIZE_0 = generateNegativeLength(0);
    private static final ByteString NEGATIVE_SIZE_1 = generateNegativeLength(1);
  
    private Registers registers;
  
    @Override
    public void setUp() {
      registers = new Registers();
      registers.int1 = TAG;
    }
  
    public void testException_decodeString() {
      try {
        ArrayDecoders.decodeString(NEGATIVE_SIZE_0.toByteArray(), 0, registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeStringRequireUtf8() {
      try {
        ArrayDecoders.decodeStringRequireUtf8(NEGATIVE_SIZE_0.toByteArray(), 0, registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeBytes() {
      try {
        ArrayDecoders.decodeBytes(NEGATIVE_SIZE_0.toByteArray(), 0, registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeStringList_first() {
      try {
        ArrayDecoders.decodeStringList(
            TAG,
            NEGATIVE_SIZE_0.toByteArray(),
            0,
            NEGATIVE_SIZE_0.size(),
            new ProtobufArrayList<Object>(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeStringList_second() {
      try {
        ArrayDecoders.decodeStringList(
            TAG,
            NEGATIVE_SIZE_1.toByteArray(),
            0,
            NEGATIVE_SIZE_1.size(),
            new ProtobufArrayList<Object>(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeStringListRequireUtf8_first() {
      try {
        ArrayDecoders.decodeStringListRequireUtf8(
            TAG,
            NEGATIVE_SIZE_0.toByteArray(),
            0,
            NEGATIVE_SIZE_0.size(),
            new ProtobufArrayList<Object>(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeStringListRequireUtf8_second() {
      try {
        ArrayDecoders.decodeStringListRequireUtf8(
            TAG,
            NEGATIVE_SIZE_1.toByteArray(),
            0,
            NEGATIVE_SIZE_1.size(),
            new ProtobufArrayList<Object>(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeBytesList_first() {
      try {
        ArrayDecoders.decodeBytesList(
            TAG,
            NEGATIVE_SIZE_0.toByteArray(),
            0,
            NEGATIVE_SIZE_0.size(),
            new ProtobufArrayList<Object>(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeBytesList_second() {
      try {
        ArrayDecoders.decodeBytesList(
            TAG,
            NEGATIVE_SIZE_1.toByteArray(),
            0,
            NEGATIVE_SIZE_1.size(),
            new ProtobufArrayList<Object>(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeUnknownField() {
      try {
        ArrayDecoders.decodeUnknownField(
            TAG,
            NEGATIVE_SIZE_0.toByteArray(),
            0,
            NEGATIVE_SIZE_0.size(),
            UnknownFieldSetLite.newInstance(),
            registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    public void testException_decodeHugeField() {
      byte[] badBytes =
          new byte[] {
            (byte) 0x80, (byte) 0xFF, (byte) 0xFF, (byte) 0xEF, 0x73, 0x74, 0x69, 0x6E, 0x67
          };
      try {
        ArrayDecoders.decodeUnknownField(
            TAG, badBytes, 0, badBytes.length, UnknownFieldSetLite.newInstance(), registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
  
      try {
        ArrayDecoders.decodeBytes(badBytes, 0, registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
  
      byte[] badBytesList =
          new byte[] {
            0x01,
            0x77,
            0x0A,
            (byte) 0x80,
            (byte) 0xFF,
            (byte) 0xFF,
            (byte) 0xEF,
            0x73,
            0x74,
            0x69,
            0x6E,
            0x67
          };
      try {
        ArrayDecoders.decodeBytesList(
            TAG, badBytesList, 0, badBytes.length, new ProtobufArrayList<>(), registers);
        fail();
      } catch (InvalidProtocolBufferException expected) {
      }
    }
  
    private static ByteString generateNegativeLength(int count) {
      try {
        ByteString.Output byteStringOutput = ByteString.newOutput();
        CodedOutputStream codedOutput = CodedOutputStream.newInstance(byteStringOutput);
  
        // Write out count - 1 valid 0 length fields; we only write out tags after the field since
        // ArrayDecoders expects the first tag to already have been parsed.
        for (int i = 0; i < count; i++) {
          codedOutput.writeInt32NoTag(0);
          codedOutput.writeInt32NoTag(TAG);
        }
  
        // Write out a negative length
        codedOutput.writeInt32NoTag(-1);
  
        codedOutput.flush();
  
        return byteStringOutput.toByteString();
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    }
  }
  