update to test changes

Author: kai-ion

src/aws-cpp-sdk-core/source/http/interceptor/ChunkingInterceptor.cpp

@@ -22,21 +22,26 @@ class AwsChunkedIOStream : public Aws::IOStream {
 
     protected:
         int_type underflow() override {
-            char buffer[8192];
-            size_t bytesRead = m_chunkStream.BufferedRead(buffer, sizeof(buffer));
+            if (gptr() < egptr()) {
+                return traits_type::to_int_type(*gptr());
+            }
+            
+            size_t bytesRead = m_chunkStream.BufferedRead(m_buffer, sizeof(m_buffer));
             if (bytesRead == 0) {
                 return traits_type::eof();
             }
 
-            // Copy to internal buffer
-            m_buffer.assign(buffer, buffer + bytesRead);
-            setg(&m_buffer[0], &m_buffer[0], &m_buffer[0] + bytesRead);
+            setg(m_buffer, m_buffer, m_buffer + bytesRead);
             return traits_type::to_int_type(*gptr());
         }
 
+        std::streamsize showmanyc() override {
+            return egptr() - gptr();
+        }
+
     private:
         Aws::Utils::Stream::AwsChunkedStream<>& m_chunkStream;
-        std::vector<char> m_buffer;
+        char m_buffer[8192];
     };
 
     Aws::Utils::Stream::AwsChunkedStream<> m_chunkStream;