2 files changed, 3 insertions, 1 deletions
diff --git a/fxbarcode/datamatrix/BC_Base256Encoder.cpp b/fxbarcode/datamatrix/BC_Base256Encoder.cpp
index b7dd69c0f7..1010cfe32c 100644
--- a/fxbarcode/datamatrix/BC_Base256Encoder.cpp
+++ b/fxbarcode/datamatrix/BC_Base256Encoder.cpp
@@ -35,6 +35,7 @@ int32_t CBC_Base256Encoder::getEncodingMode() {
 }
 void CBC_Base256Encoder::Encode(CBC_EncoderContext& context, int32_t& e) {
   WideString buffer;
+  buffer.Reserve(context.getRemainingCharacters() + 1);
   buffer += L'\0';
   while (context.hasMoreCharacters()) {
     wchar_t c = context.getCurrentChar();
diff --git a/fxbarcode/datamatrix/BC_EncoderContext.cpp b/fxbarcode/datamatrix/BC_EncoderContext.cpp
index fe0a497d58..d9823bffe2 100644
--- a/fxbarcode/datamatrix/BC_EncoderContext.cpp
+++ b/fxbarcode/datamatrix/BC_EncoderContext.cpp
@@ -33,8 +33,9 @@ CBC_EncoderContext::CBC_EncoderContext(const WideString& msg,
                                        int32_t& e) {
   ByteString dststr;
   CBC_UtilCodingConvert::UnicodeToUTF8(msg, dststr);
-  WideString sb;
   size_t c = dststr.GetLength();
+  WideString sb;
+  sb.Reserve(c);
   for (size_t i = 0; i < c; i++) {
     wchar_t ch = static_cast<wchar_t>(dststr[i] & 0xff);
     if (ch == '?' && dststr[i] != '?') {