Ensure ZILB encoder handles all typed data lists correctly

runtime/bin/filter.cc

 // Copyright (c) 2013, 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.
 
 #include "bin/dartutils.h"
 #include "bin/filter.h"
 #include "bin/io_buffer.h"
 
 #include "include/dart_api.h"
 
@@ skipping 136 matching lines @@
   Filter* filter = GetFilter(filter_obj);
   Dart_Handle data_obj = Dart_GetNativeArgument(args, 1);
   intptr_t start = DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 2));
   intptr_t end = DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 3));
   intptr_t chunk_length = end - start;
   intptr_t length;
   Dart_TypedData_Type type;
   uint8_t* buffer = NULL;
   Dart_Handle result = Dart_TypedDataAcquireData(
       data_obj, &type, reinterpret_cast<void**>(&buffer), &length);
+
   if (!Dart_IsError(result)) {
+    ASSERT(type == Dart_TypedData_kUint8 || type == Dart_TypedData_kInt8);
+    if (type != Dart_TypedData_kUint8 && type != Dart_TypedData_kInt8) {
+      Dart_TypedDataReleaseData(data_obj);
+      Dart_ThrowException(DartUtils::NewInternalError(
+          "Invalid argument passed to Filter_Process"));
+    }
     uint8_t* zlib_buffer = new uint8_t[chunk_length];
     if (zlib_buffer == NULL) {
       Dart_TypedDataReleaseData(data_obj);
       Dart_ThrowException(DartUtils::NewInternalError(
           "Failed to allocate buffer for zlib"));
     }
     memmove(zlib_buffer, buffer + start, chunk_length);
     Dart_TypedDataReleaseData(data_obj);
     buffer = zlib_buffer;
   } else {
@@ skipping 231 matching lines @@
   }
 
   delete[] current_buffer_;
   current_buffer_ = NULL;
   // Either 0 Byte processed or error
   return error ? -1 : 0;
 }
 
 }  // namespace bin
 }  // namespace dart