From 2c4ace2c2cf853c85d9b32d42e8bae39d88a7355 Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Mon, 15 Nov 2021 19:48:08 +0300
Subject: add routines to get dir entries

---
 Library/UefiShellUfmCommandLib/dir.c | 64 ++++++++++++++++++++++++++++++++++++
 Library/UefiShellUfmCommandLib/dir.h | 30 +++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 Library/UefiShellUfmCommandLib/dir.c
 create mode 100644 Library/UefiShellUfmCommandLib/dir.h

diff --git a/Library/UefiShellUfmCommandLib/dir.c b/Library/UefiShellUfmCommandLib/dir.c
new file mode 100644
index 0000000..12bc13b
--- /dev/null
+++ b/Library/UefiShellUfmCommandLib/dir.c
@@ -0,0 +1,64 @@
+#include <Library/UefiLib.h>
+#include <Library/DebugLib.h>
+#include <Library/ShellLib.h>
+#include <Library/BaseLib.h>
+#include <Library/MemoryAllocationLib.h>
+
+#include "dir.h"
+
+struct dir_list *dirl_alloc(CHAR16 *search_path, CONST UINT64 attr)
+{
+	EFI_STATUS status = EFI_SUCCESS;
+	EFI_SHELL_FILE_INFO *list_head = NULL, *node = NULL;
+	UINTN length = 0;
+	struct dir_list *dl;
+
+	status = ShellOpenFileMetaArg(search_path, EFI_FILE_MODE_READ, &list_head);
+	if(EFI_ERROR(status))
+		return NULL;
+
+	for(node = (EFI_SHELL_FILE_INFO *)GetFirstNode(&list_head->Link);
+			!IsNull(&list_head->Link, &node->Link);
+			node = (EFI_SHELL_FILE_INFO *)GetNextNode(&list_head->Link, &node->Link))
+	{
+		ASSERT(node != NULL);
+		ASSERT(node->Info != NULL);
+		ASSERT((node->Info->Attribute & EFI_FILE_VALID_ATTR) == node->Info->Attribute);
+
+		if((node->Info->Attribute & attr) != attr ||
+				StrCmp(node->FileName, L".") == 0) {
+			EFI_SHELL_FILE_INFO *tmp;
+			tmp = (EFI_SHELL_FILE_INFO *)GetPreviousNode(&list_head->Link, &node->Link);
+			
+			// I have stolen code below in the source code of InternalFreeShellFileInfoNode():
+			RemoveEntryList(&node->Link);
+			FreePool((VOID*)node->Info);
+			FreePool((VOID*)node->FileName);
+			FreePool((VOID*)node->FullName);
+			gEfiShellProtocol->CloseFile(node->Handle);
+			FreePool(node);
+			node = tmp;
+			continue;
+		}
+
+		length++;
+	}
+
+	dl = AllocatePool(sizeof(struct dir_list));
+	if(!dl) {
+		ShellCloseFileMetaArg(&list_head);
+		return NULL;
+	}
+
+	dl->list_head = list_head;
+	dl->len = length;
+	return dl;
+}	
+
+VOID dirl_release(struct dir_list *dl)
+{
+	if(dl->list_head)
+		ShellCloseFileMetaArg(&dl->list_head);
+
+	FreePool(dl);
+}
diff --git a/Library/UefiShellUfmCommandLib/dir.h b/Library/UefiShellUfmCommandLib/dir.h
new file mode 100644
index 0000000..be560ad
--- /dev/null
+++ b/Library/UefiShellUfmCommandLib/dir.h
@@ -0,0 +1,30 @@
+#ifndef UFM_DIR_H
+#define UFM_DIR_H
+
+#include <Uefi.h>
+
+struct dir_list {
+	EFI_SHELL_FILE_INFO *list_head;
+	int len; // number of elements in list
+};
+
+/*
+ * Opens a directory and gets all its entries
+ *
+ * search_path: the pointer to path string
+ * attr: required file attributes
+ *
+ * return: A pointer to the allocated structure or NULL if allocation fails
+*/
+struct dir_list *dirl_alloc(CHAR16 *search_path, CONST UINT64 attr);
+
+/*
+ * Deletes the directory list, frees the structure
+ *
+ * dl: the pointer to the directory list
+ *
+ * return: VOID
+*/
+VOID dirl_release(struct dir_list *dl);
+
+#endif /* UFM_DIR_H */
-- 
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