CID#1078782: fix memory leak

Change-Id: I4a98e68b5f74de787e28925e2e55de96f1cb980e

vcl/source/gdi/pdfwriter_impl.cxx

@@ -5993,7 +5993,7 @@ bool PDFWriterImpl::finalizeSignature()
     // Prepare buffer and calculate PDF file digest
     CHECK_RETURN( (osl_File_E_None == osl_setFilePos( m_aFile, osl_Pos_Absolut, 0) ) );
 
-    HASHContext *hc = HASH_Create(HASH_AlgSHA1);
+    boost::scoped_ptr<HASHContext> hc(HASH_Create(HASH_AlgSHA1));
 
     if (!hc)
     {
@@ -6001,7 +6001,7 @@ bool PDFWriterImpl::finalizeSignature()
         return false;
     }
 
-    HASH_Begin(hc);
+    HASH_Begin(hc.get());
 
     char *buffer = new char[m_nSignatureContentOffset + 1];
     sal_uInt64 bytesRead;
@@ -6012,7 +6012,7 @@ bool PDFWriterImpl::finalizeSignature()
     if (bytesRead != (sal_uInt64)m_nSignatureContentOffset - 1)
         SAL_WARN("vcl.gdi", "PDF Signing: First buffer read failed!");
 
-    HASH_Update(hc, reinterpret_cast<const unsigned char*>(buffer), bytesRead);
+    HASH_Update(hc.get(), reinterpret_cast<const unsigned char*>(buffer), bytesRead);
     delete[] buffer;
 
     CHECK_RETURN( (osl_File_E_None == osl_setFilePos( m_aFile, osl_Pos_Absolut, m_nSignatureContentOffset + MAX_SIGNATURE_CONTENT_LENGTH + 1) ) );
@@ -6021,14 +6021,14 @@ bool PDFWriterImpl::finalizeSignature()
     if (bytesRead != (sal_uInt64) nLastByteRangeNo)
         SAL_WARN("vcl.gdi", "PDF Signing: Second buffer read failed!");
 
-    HASH_Update(hc, reinterpret_cast<const unsigned char*>(buffer), bytesRead);
+    HASH_Update(hc.get(), reinterpret_cast<const unsigned char*>(buffer), bytesRead);
     delete[] buffer;
 
     SECItem digest;
     unsigned char hash[SHA1_LENGTH];
     digest.data = hash;
-    HASH_End(hc, digest.data, &digest.len, SHA1_LENGTH);
-    HASH_Destroy(hc);
+    HASH_End(hc.get(), digest.data, &digest.len, SHA1_LENGTH);
+    HASH_Destroy(hc.get());
 
     const char *pass = OUStringToOString( m_aContext.SignPassword, RTL_TEXTENCODING_UTF8 ).getStr();