Bugfix for broken protobuf decoding in case of Uint8List views with non-zero offsets

lib/src/protobuf/coded_buffer_reader.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of protobuf;
 
 class CodedBufferReader {
   static const int DEFAULT_RECURSION_LIMIT = 64;
   static const int DEFAULT_SIZE_LIMIT = 64 << 20;
 
@@ skipping 109 matching lines @@
   int readSfixed32() => _readByteData(4).getInt32(0, Endianness.LITTLE_ENDIAN);
   Int64 readSfixed64() {
     var data = _readByteData(8);
     var view = new Uint8List.view(data.buffer, data.offsetInBytes, 8);
     return new Int64.fromBytes(view);
   }
   bool readBool() => _readRawVarint32() != 0;
   List<int> readBytes() {
     int length = readInt32();
     _checkLimit(length);
-    return new Uint8List.view(_buffer.buffer, _bufferPos - length, length);
+    return new Uint8List.view(_buffer.buffer,
+        _buffer.offsetInBytes + _bufferPos - length, length);
   }
   String readString() => _UTF8.decode(readBytes());
   double readFloat() =>
       _readByteData(4).getFloat32(0, Endianness.LITTLE_ENDIAN);
   double readDouble() =>
       _readByteData(8).getFloat64(0, Endianness.LITTLE_ENDIAN);
 
   int readTag() {
     if (isAtEnd()) {
       _lastTag = 0;
@@ skipping 62 matching lines @@
     for (int i = 0; i < 5; i++) {
       int byte = _readRawVarintByte();
       hi |= (byte & 0x7f) << ((i * 7) + 3);
       if ((byte & 0x80) == 0) return new Int64.fromInts(hi, lo);
     }
     throw new InvalidProtocolBufferException.malformedVarint();
   }
 
   ByteData _readByteData(int sizeInBytes) {
     _checkLimit(sizeInBytes);
-    return new ByteData.view(
-        _buffer.buffer, _bufferPos - sizeInBytes, sizeInBytes);
+    return new ByteData.view(_buffer.buffer,
+        _buffer.offsetInBytes + _bufferPos - sizeInBytes, sizeInBytes);
   }
 }