From bd79cde9742b0fa7b5f38f7b820180f57ba2f55e Mon Sep 17 00:00:00 2001
From: Josh F <josh@vector35.com>
Date: Thu, 21 Jul 2022 16:30:49 -0400
Subject: Add FileMetadata::GetLast{Undo,Redo}Entry, add valid field to
 BNUndoEntry

---
 binaryninjaapi.h  |  2 ++
 binaryninjacore.h |  3 +++
 filemetadata.cpp  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+)

diff --git a/binaryninjaapi.h b/binaryninjaapi.h
index 1c33f70b..692c6901 100644
--- a/binaryninjaapi.h
+++ b/binaryninjaapi.h
@@ -1079,6 +1079,8 @@ namespace BinaryNinja {
 		std::vector<Ref<User>> GetUsers();
 		std::vector<UndoEntry> GetUndoEntries();
 		std::vector<UndoEntry> GetRedoEntries();
+		std::optional<UndoEntry> GetLastUndoEntry();
+		std::optional<UndoEntry> GetLastRedoEntry();
 		void ClearUndoEntries();
 
 		bool OpenProject();
diff --git a/binaryninjacore.h b/binaryninjacore.h
index be051b50..6c830729 100644
--- a/binaryninjacore.h
+++ b/binaryninjacore.h
@@ -1940,6 +1940,7 @@ extern "C"
 
 	struct BNUndoEntry
 	{
+		bool valid;
 		BNUser* user;
 		char* hash;
 		BNUndoAction* actions;
@@ -3164,6 +3165,8 @@ extern "C"
 
 	BINARYNINJACOREAPI BNUndoEntry* BNGetUndoEntries(BNFileMetadata* file, size_t* count);
 	BINARYNINJACOREAPI BNUndoEntry* BNGetRedoEntries(BNFileMetadata* file, size_t* count);
+	BINARYNINJACOREAPI BNUndoEntry BNGetLastUndoEntry(BNFileMetadata* file);
+	BINARYNINJACOREAPI BNUndoEntry BNGetLastRedoEntry(BNFileMetadata* file);
 	BINARYNINJACOREAPI void BNFreeUndoEntries(BNUndoEntry* entries, size_t count);
 	BINARYNINJACOREAPI void BNClearUndoEntries(BNFileMetadata* file);
 
diff --git a/filemetadata.cpp b/filemetadata.cpp
index 9d9b2a3a..5d01c3b0 100644
--- a/filemetadata.cpp
+++ b/filemetadata.cpp
@@ -364,6 +364,8 @@ vector<UndoEntry> FileMetadata::GetUndoEntries()
 	result.reserve(numEntries);
 	for (size_t i = 0; i < numEntries; i++)
 	{
+		if (!entries[i].valid)
+			continue;
 		UndoEntry temp;
 		temp.timestamp = entries[i].timestamp;
 		temp.hash = entries[i].hash;
@@ -390,6 +392,8 @@ vector<UndoEntry> FileMetadata::GetRedoEntries()
 	result.reserve(numEntries);
 	for (size_t i = 0; i < numEntries; i++)
 	{
+		if (!entries[i].valid)
+			continue;
 		UndoEntry temp;
 		temp.timestamp = entries[i].timestamp;
 		temp.hash = entries[i].hash;
@@ -407,6 +411,48 @@ vector<UndoEntry> FileMetadata::GetRedoEntries()
 }
 
 
+std::optional<UndoEntry> FileMetadata::GetLastUndoEntry()
+{
+	BNUndoEntry bnEntry = BNGetLastUndoEntry(m_object);
+
+	if (!bnEntry.valid)
+		return {};
+
+	UndoEntry entry;
+	entry.timestamp = bnEntry.timestamp;
+	entry.hash = bnEntry.hash;
+	entry.user = new User(BNNewUserReference(bnEntry.user));
+	size_t actionCount = bnEntry.actionCount;
+	for (size_t actionIndex = 0; actionIndex < actionCount; actionIndex++)
+	{
+		entry.actions.emplace_back(bnEntry.actions[actionIndex]);
+	}
+
+	return entry;
+}
+
+
+std::optional<UndoEntry> FileMetadata::GetLastRedoEntry()
+{
+	BNUndoEntry bnEntry = BNGetLastRedoEntry(m_object);
+
+	if (!bnEntry.valid)
+		return {};
+
+	UndoEntry entry;
+	entry.timestamp = bnEntry.timestamp;
+	entry.hash = bnEntry.hash;
+	entry.user = new User(BNNewUserReference(bnEntry.user));
+	size_t actionCount = bnEntry.actionCount;
+	for (size_t actionIndex = 0; actionIndex < actionCount; actionIndex++)
+	{
+		entry.actions.emplace_back(bnEntry.actions[actionIndex]);
+	}
+
+	return entry;
+}
+
+
 void FileMetadata::ClearUndoEntries()
 {
 	BNClearUndoEntries(m_object);
-- 
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