From 5c0604dbf95bc30a71a1594c5207f82dd7dc965d Mon Sep 17 00:00:00 2001
From: Regina König
Date: Wed, 19 Aug 2020 17:30:00 +0200
Subject: able to append one symbol to an existing file

---
 .../ProtocolInformation/ProtocolInformation.c      | 38 +++++++++++++---------
 1 file changed, 23 insertions(+), 15 deletions(-)

(limited to 'memtestEDK')

diff --git a/memtestEDK/Memtest/ProtocolInformation/ProtocolInformation.c b/memtestEDK/Memtest/ProtocolInformation/ProtocolInformation.c
index 547c91e..ddc6e82 100644
--- a/memtestEDK/Memtest/ProtocolInformation/ProtocolInformation.c
+++ b/memtestEDK/Memtest/ProtocolInformation/ProtocolInformation.c
@@ -18,6 +18,9 @@ UefiMain (
   EFI_BOOT_SERVICES* bs = SystemTable->BootServices;
   EFI_GUID sfspGuid = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
 
+  EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *Console = SystemTable->ConOut;
+
+
   EFI_HANDLE* handleBuffer = NULL;
   EFI_HANDLE* handleBuffer2 = NULL;   
   UINTN handleCount = 0;
@@ -179,32 +182,37 @@ UefiMain (
             Print(L"File Buffer Pointer: %p\n", fileBuffer);
             Print(L"File Content: %a\n", fileBuffer);
 
+
             UINT64 currPos;
 
             token->GetPosition(token, &currPos);
             Print(L"Current File Position: %d\n", currPos);
 
-            fileBuffer[0] = (CHAR16) 'X';
-            Print(L"New file Buffer: %a\n", fileBuffer);
 
-            token->SetPosition(token, 0);
 
-            efiStatus = token->Write(token, &fileSize, fileBuffer);
+            fileBuffer[0] = (CHAR16) 'C';
+            fileBuffer[1] = (CHAR16) '\0';
+            Console->OutputString(Console, fileBuffer);
+            UINTN length = 2;
+            fileSize += 2;
+
+            token->SetPosition(token, 35);
+
+            efiStatus = token->Write(token, &length, fileBuffer);
 
             Print(L"Status after file write: %r\n", efiStatus);
 
+            token->SetPosition(token, fileSize - 2);
+
+            efiStatus = token->Read(token, &fileSize, fileBuffer);
+            Print(L"File Content after write: %a\n", fileBuffer);
+
+
+            token->SetPosition(token, 0);
+
+            efiStatus = token->Read(token, &fileSize, fileBuffer);
+            Print(L"File Content after write: %a\n", fileBuffer);
 
-/*
-          EFI_FILE_OPEN         Open;
-  EFI_FILE_CLOSE        Close;
-  EFI_FILE_DELETE       Delete;
-  EFI_FILE_READ         Read;
-  EFI_FILE_WRITE        Write;
-  EFI_FILE_GET_POSITION GetPosition;
-  EFI_FILE_SET_POSITION SetPosition;
-  EFI_FILE_GET_INFO     GetInfo;
-  EFI_FILE_SET_INFO     SetInfo;
-  EFI_FILE_FLUSH        Flush;*/
           }
         }
       }
-- 
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