ShellPkg: Fix ASCII and UNICODE file pipes.

Fix various errors when piping a UNICODE or ASCII file to a simple shell application that reads standard input and writes it to standard output.

1) When the memory file is created by CreateFileInferfaceMem() to capture the pipe output, no UNICODE BOM is written to the memory file. Later, when the memory file is read by the application using ShellFileHandleReadLine(), the function indicates that the file is ASCII because there is no BOM.

2) If the file is piped as ASCII, the ASCII memory image is not correctly created by FileInterfaceMemWrite() as each ASCII character is followed by '\0' in the image (when the ASCII data is written to the memory image, the file position should only be incremented by half the buffer size).

3) ShellFileHandleReadLine() does not read ASCII files correctly (writes to Buffer need to be cast as CHAR8*).

4) FileInterfaceMemRead() and FileInterfaceMemWrite() as somewhat hard to read and difficult to debug with certain tools due to the typecasting of This. Added a local variable (MemFile) of the correct type to these functions and used it instead of This.

Enhancement: ShellFileHandleReadLine() now returns EFI_END_OF_FILE when appropriate.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jim Dailey <jim_dailey@dell.com>
reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

1 files changed, 39 insertions, 18 deletions

diff --git a/ShellPkg/Library/UefiShellLib/UefiShellLib.c b/ShellPkg/Library/UefiShellLib/UefiShellLib.c
index 9e815c56a6..4b53c7080c 100644
--- a/ShellPkg/Library/UefiShellLib/UefiShellLib.c
+++ b/ShellPkg/Library/UefiShellLib/UefiShellLib.c
@@ -1,6 +1,7 @@
 /** @file

   Provides interface to shell functionality for shell commands and applications.

 

+  Copyright 2016 Dell Inc.

   Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>

   This program and the accompanying materials

   are licensed and made available under the terms and conditions of the BSD License

@@ -4097,6 +4098,7 @@ ShellFileHandleReturnLine(
 

   @retval EFI_SUCCESS           The operation was successful.  The line is stored in

                                 Buffer.

+  @retval EFI_END_OF_FILE       There are no more lines in the file.

   @retval EFI_INVALID_PARAMETER Handle was NULL.

   @retval EFI_INVALID_PARAMETER Size was NULL.

   @retval EFI_BUFFER_TOO_SMALL  Size was not large enough to store the line.

@@ -4142,45 +4144,64 @@ ShellFileHandleReadLine(
     }

   }

 

+  if (*Ascii) {

+    CharSize = sizeof(CHAR8);

+  } else {

+    CharSize = sizeof(CHAR16);

+  }

   for (CountSoFar = 0;;CountSoFar++){

     CharBuffer = 0;

-    if (*Ascii) {

-      CharSize = sizeof(CHAR8);

-    } else {

-      CharSize = sizeof(CHAR16);

-    }

     Status = gEfiShellProtocol->ReadFile(Handle, &CharSize, &CharBuffer);

     if (  EFI_ERROR(Status)

        || CharSize == 0

        || (CharBuffer == L'\n' && !(*Ascii))

        || (CharBuffer ==  '\n' && *Ascii)

      ){

+      if (CharSize == 0) {

+        Status = EFI_END_OF_FILE;

+      }

       break;

     }

     //

     // if we have space save it...

     //

-    if ((CountSoFar+1)*sizeof(CHAR16) < *Size){

+    if ((CountSoFar + 1) * CharSize < *Size){

       ASSERT(Buffer != NULL);

-      ((CHAR16*)Buffer)[CountSoFar] = CharBuffer;

-      ((CHAR16*)Buffer)[CountSoFar+1] = CHAR_NULL;

+      if (*Ascii) {

+        ((CHAR8*)Buffer)[CountSoFar] = (CHAR8) CharBuffer;

+        ((CHAR8*)Buffer)[CountSoFar+1] = '\0';

+      }

+      else {

+        ((CHAR16*)Buffer)[CountSoFar] = CharBuffer;

+        ((CHAR16*)Buffer)[CountSoFar+1] = CHAR_NULL;

+      }

     }

   }

 

   //

   // if we ran out of space tell when...

   //

-  if ((CountSoFar+1)*sizeof(CHAR16) > *Size){

-    *Size = (CountSoFar+1)*sizeof(CHAR16);

-    if (!Truncate) {

-      gEfiShellProtocol->SetFilePosition(Handle, OriginalFilePosition);

-    } else {

-      DEBUG((DEBUG_WARN, "The line was truncated in ShellFileHandleReadLine"));

+  if (Status != EFI_END_OF_FILE){

+    if ((CountSoFar + 1) * CharSize > *Size){

+      *Size = (CountSoFar + 1) * CharSize;

+      if (!Truncate) {

+        gEfiShellProtocol->SetFilePosition(Handle, OriginalFilePosition);

+      } else {

+        DEBUG((DEBUG_WARN, "The line was truncated in ShellFileHandleReadLine"));

+      }

+      return (EFI_BUFFER_TOO_SMALL);

+    }

+

+    if (*Ascii) {

+      if (CountSoFar && ((CHAR8*)Buffer)[CountSoFar - 1] == '\r') {

+        ((CHAR8*)Buffer)[CountSoFar - 1] = '\0';

+      }

+    }

+    else {

+      if (CountSoFar && Buffer[CountSoFar - 1] == L'\r') {

+        Buffer[CountSoFar - 1] = CHAR_NULL;

+      }

     }

-    return (EFI_BUFFER_TOO_SMALL);

-  }

-  while(Buffer[StrLen(Buffer)-1] == L'\r') {

-    Buffer[StrLen(Buffer)-1] = CHAR_NULL;

   }

 

   return (Status);