MdeModulePkg/Bds: Wide match HTTP boot option.

Enhance BDS to wide match the HTTP boot option without matching
the specific device path data in IP device path and URI device
path node.
It's to follow UEFI Spec 2.6.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Sunny Wang <sunnywang@hpe.com>

MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c

@@ -1527,6 +1527,136 @@ BmExpandMediaDevicePath (
   return FileBuffer;
 }
 
+/**
+  Check whether Left and Right are the same without matching the specific
+  device path data in IP device path and URI device path node.
+
+  @retval TRUE  Left and Right are the same.
+  @retval FALSE Left and Right are the different.
+**/
+BOOLEAN
+BmMatchHttpBootDevicePath (
+  IN EFI_DEVICE_PATH_PROTOCOL *Left,
+  IN EFI_DEVICE_PATH_PROTOCOL *Right
+  )
+{
+  for (;  !IsDevicePathEnd (Left) && !IsDevicePathEnd (Right)
+       ;  Left = NextDevicePathNode (Left), Right = NextDevicePathNode (Right)
+       ) {
+    if (CompareMem (Left, Right, DevicePathNodeLength (Left)) != 0) {
+      if ((DevicePathType (Left) != MESSAGING_DEVICE_PATH) || (DevicePathType (Right) != MESSAGING_DEVICE_PATH)) {
+        return FALSE;
+      }
+
+      if (((DevicePathSubType (Left) != MSG_IPv4_DP) || (DevicePathSubType (Right) != MSG_IPv4_DP)) &&
+          ((DevicePathSubType (Left) != MSG_IPv6_DP) || (DevicePathSubType (Right) != MSG_IPv6_DP)) &&
+          ((DevicePathSubType (Left) != MSG_URI_DP)  || (DevicePathSubType (Right) != MSG_URI_DP))
+          ) {
+        return FALSE;
+      }
+    }
+  }
+  return (BOOLEAN) (IsDevicePathEnd (Left) && IsDevicePathEnd (Right));
+}
+
+/**
+  Get the file buffer from Load File instance.
+
+  @param FilePath    The media device path pointing to a LoadFile instance.
+  @param FullPath    Return the full device path pointing to the load option.
+  @param FileSize    Return the size of the load option.
+
+  @return  The load option buffer.
+**/
+VOID *
+BmGetFileBufferFromLoadFile (
+  IN  EFI_DEVICE_PATH_PROTOCOL        *FilePath,
+  OUT EFI_DEVICE_PATH_PROTOCOL        **FullPath,
+  OUT UINTN                           *FileSize
+  )
+{
+  EFI_STATUS                      Status;
+  EFI_HANDLE                      Handle;
+  VOID                            *FileBuffer;
+  EFI_HANDLE                      *Handles;
+  UINTN                           HandleCount;
+  UINTN                           Index;
+  EFI_DEVICE_PATH_PROTOCOL        *Node;
+  EFI_LOAD_FILE_PROTOCOL          *LoadFile;
+  UINTN                           BufferSize;
+
+  //
+  // Get file buffer from load file instance.
+  //
+  Node = FilePath;
+  Status = gBS->LocateDevicePath (&gEfiLoadFileProtocolGuid, &Node, &Handle);
+  if (!EFI_ERROR (Status) && IsDevicePathEnd (Node)) {
+    //
+    // When wide match happens, pass full device path to LoadFile (),
+    // otherwise, pass remaining device path to LoadFile ().
+    //
+    FilePath = Node;
+  } else {
+    Handle = NULL;
+    //
+    // Use wide match algorithm to find one when
+    //  cannot find a LoadFile instance to exactly match the FilePath
+    //
+    Status = gBS->LocateHandleBuffer (
+                    ByProtocol,
+                    &gEfiLoadFileProtocolGuid,
+                    NULL,
+                    &HandleCount,
+                    &Handles
+                    );
+    if (EFI_ERROR (Status)) {
+      Handles = NULL;
+      HandleCount = 0;
+    }
+    for (Index = 0; Index < HandleCount; Index++) {
+      if (BmMatchHttpBootDevicePath (DevicePathFromHandle (Handles[Index]), FilePath)) {
+        Handle = Handles[Index];
+        break;
+      }
+    }
+    if (Handles != NULL) {
+      FreePool (Handles);
+    }
+  }
+
+  if (Handle == NULL) {
+    return NULL;
+  }
+
+  Status = gBS->HandleProtocol (Handle, &gEfiLoadFileProtocolGuid, (VOID **) &LoadFile);
+  ASSERT_EFI_ERROR (Status);
+
+  BufferSize = 0;
+  FileBuffer = NULL;
+  Status = LoadFile->LoadFile (LoadFile, FilePath, TRUE, &BufferSize, FileBuffer);
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    FileBuffer = AllocatePool (BufferSize);
+    if (FileBuffer != NULL) {
+      Status = EFI_SUCCESS;
+    }
+  }
+
+  if (!EFI_ERROR (Status)) {
+    Status = LoadFile->LoadFile (LoadFile, FilePath, TRUE, &BufferSize, FileBuffer);
+  }
+
+  if (!EFI_ERROR (Status)) {
+    //
+    // LoadFile () may cause the device path of the Handle be updated.
+    //
+    *FullPath = DuplicateDevicePath (DevicePathFromHandle (Handle));
+    *FileSize = BufferSize;
+    return FileBuffer;
+  } else {
+    return NULL;
+  }
+}
+
 /**
   Get the load option by its device path.
 
@@ -1622,24 +1752,19 @@ BmGetLoadOptionBuffer (
   }
 
   //
-  // Directly reads the load option when it doesn't reside in simple file system instance (LoadFile/LoadFile2),
-  //   or it directly points to a file in simple file system instance.
+  // Get file buffer from simple file system.
   //
   Node   = FilePath;
-  Status = gBS->LocateDevicePath (&gEfiLoadFileProtocolGuid, &Node, &Handle);
-  FileBuffer = GetFileBufferByFilePath (TRUE, FilePath, FileSize, &AuthenticationStatus);
-  if (FileBuffer != NULL) {
-    if (EFI_ERROR (Status)) {
+  Status = gBS->LocateDevicePath (&gEfiSimpleFileSystemProtocolGuid, &Node, &Handle);
+  if (!EFI_ERROR (Status)) {
+    FileBuffer = GetFileBufferByFilePath (TRUE, FilePath, FileSize, &AuthenticationStatus);
+    if (FileBuffer != NULL) {
       *FullPath = DuplicateDevicePath (FilePath);
-    } else {
-      //
-      // LoadFile () may cause the device path of the Handle be updated.
-      //
-      *FullPath = AppendDevicePath (DevicePathFromHandle (Handle), Node);
     }
+    return FileBuffer;
   }
 
-  return FileBuffer;
+  return BmGetFileBufferFromLoadFile (FilePath, FullPath, FileSize);
 }
 
 /**