changing the size to fix size

Author: kai-ion

src/aws-cpp-sdk-core/include/smithy/client/features/ChunkingInterceptor.h

@@ -50,21 +50,13 @@ class AwsChunkedStreamBuf : public std::streambuf {
             return traits_type::to_int_type(*gptr());
         }
 
-        // Compact buffer when consumed data exceeds half buffer size
-        if (m_chunkingBufferPos > m_chunkingBuffer.GetLength() / 2) {
-            size_t remaining = m_chunkingBufferSize - m_chunkingBufferPos;
-            if (remaining > 0) {
-                std::memmove(m_chunkingBuffer.GetUnderlyingData(), 
-                           m_chunkingBuffer.GetUnderlyingData() + m_chunkingBufferPos, 
-                           remaining);
-            }
-            m_chunkingBufferSize = remaining;
-            m_chunkingBufferPos = 0;
-        }
-
         // only read and write to chunked stream if the underlying stream
         // is still in a valid state and we have buffer space
-        if (m_stream->good()) {
+        if (m_stream->good() && m_chunkingBufferPos >= m_chunkingBufferSize) {
+            // Reset buffer for new data only when buffer is consumed
+            m_chunkingBufferPos = 0;
+            m_chunkingBufferSize = 0;
+            
             // Check if we have enough space for worst-case chunk (data + header + footer)
             size_t maxChunkSize = m_data.GetLength() + 20; // data + hex header + CRLF
             if (m_chunkingBufferSize + maxChunkSize <= m_chunkingBuffer.GetLength()) {
@@ -132,7 +124,8 @@ class AwsChunkedStreamBuf : public std::streambuf {
         }
     }
 
-    Aws::Utils::Array<char> m_chunkingBuffer{DataBufferSize * 4};
+    // Buffer for chunked data plus overhead for HTTP chunked encoding headers, trailers, and safety margin
+    Aws::Utils::Array<char> m_chunkingBuffer{DataBufferSize + 128};
     size_t m_chunkingBufferSize{0};
     size_t m_chunkingBufferPos{0};
     Aws::Http::HttpRequest* m_request{nullptr};