From dde32cdf497fe54312eca476bc32e147671d3c0d Mon Sep 17 00:00:00 2001
From: Rusty Wagner <dontpanic@binaryninja.com>
Date: Fri, 20 Mar 2015 01:21:01 -0400
Subject: Code cross references, undo for creation of functions

---
 binaryninjaapi.h | 12 ++++++++++++
 binaryview.cpp   | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/binaryninjaapi.h b/binaryninjaapi.h
index d7c2c091..26bf6759 100644
--- a/binaryninjaapi.h
+++ b/binaryninjaapi.h
@@ -338,6 +338,13 @@ namespace BinaryNinja
 		uint64_t GetAddress() const;
 	};
 
+	struct ReferenceSource
+	{
+		Ref<Function> func;
+		Ref<Architecture> arch;
+		uint64_t addr;
+	};
+
 	class BinaryView: public RefCountObject
 	{
 	protected:
@@ -352,6 +359,7 @@ namespace BinaryNinja
 		static size_t InsertCallback(void* ctxt, uint64_t offset, const void* src, size_t len);
 		static size_t RemoveCallback(void* ctxt, uint64_t offset, uint64_t len);
 		static BNModificationStatus GetModificationCallback(void* ctxt, uint64_t offset);
+		static bool IsValidOffsetCallback(void* ctxt, uint64_t offset);
 		static uint64_t GetStartCallback(void* ctxt);
 		static uint64_t GetLengthCallback(void* ctxt);
 		static uint64_t GetEntryPointCallback(void* ctxt);
@@ -364,6 +372,7 @@ namespace BinaryNinja
 		virtual size_t PerformRemove(uint64_t offset, uint64_t len) { (void)offset; (void)len; return 0; }
 
 		virtual BNModificationStatus PerformGetModification(uint64_t offset) { (void)offset; return Original; }
+		virtual bool PerformIsValidOffset(uint64_t offset);
 		virtual uint64_t PerformGetStart() const { return 0; }
 		virtual uint64_t PerformGetLength() const { return 0; }
 		virtual uint64_t PerformGetEntryPoint() const { return 0; }
@@ -423,6 +432,7 @@ namespace BinaryNinja
 
 		void AddFunctionForAnalysis(Architecture* arch, uint64_t addr);
 		void AddEntryPointForAnalysis(Architecture* arch, uint64_t start);
+		void RemoveAnalysisFunction(Function* func);
 		void UpdateAnalysis();
 		void AbortAnalysis();
 
@@ -435,6 +445,8 @@ namespace BinaryNinja
 		Ref<BasicBlock> GetRecentBasicBlockForAddress(uint64_t addr);
 		std::vector<Ref<BasicBlock>> GetBasicBlocksForAddress(uint64_t addr);
 
+		std::vector<ReferenceSource> GetCodeReferences(uint64_t addr);
+
 		Ref<Symbol> GetSymbolByAddress(uint64_t addr);
 		Ref<Symbol> GetSymbolByRawName(const std::string& name);
 		std::vector<Ref<Symbol>> GetSymbolsByName(const std::string& name);
diff --git a/binaryview.cpp b/binaryview.cpp
index 2f6e42ef..a965d67c 100644
--- a/binaryview.cpp
+++ b/binaryview.cpp
@@ -188,6 +188,13 @@ BNModificationStatus BinaryView::GetModificationCallback(void* ctxt, uint64_t of
 }
 
 
+bool BinaryView::IsValidOffsetCallback(void* ctxt, uint64_t offset)
+{
+	BinaryView* view = (BinaryView*)ctxt;
+	return view->PerformIsValidOffset(offset);
+}
+
+
 uint64_t BinaryView::GetStartCallback(void* ctxt)
 {
 	BinaryView* view = (BinaryView*)ctxt;
@@ -224,6 +231,13 @@ bool BinaryView::SaveCallback(void* ctxt, BNFileAccessor* file)
 }
 
 
+bool BinaryView::PerformIsValidOffset(uint64_t offset)
+{
+	uint8_t val;
+	return PerformRead(&val, offset, 1) == 1;
+}
+
+
 bool BinaryView::IsModified() const
 {
 	return BNIsViewModified(m_view);
@@ -425,6 +439,12 @@ void BinaryView::AddEntryPointForAnalysis(Architecture* arch, uint64_t addr)
 }
 
 
+void BinaryView::RemoveAnalysisFunction(Function* func)
+{
+	BNRemoveAnalysisFunction(m_view, func->GetFunctionObject());
+}
+
+
 void BinaryView::UpdateAnalysis()
 {
 	BNUpdateAnalysis(m_view);
@@ -515,6 +535,25 @@ vector<Ref<BasicBlock>> BinaryView::GetBasicBlocksForAddress(uint64_t addr)
 }
 
 
+vector<ReferenceSource> BinaryView::GetCodeReferences(uint64_t addr)
+{
+	size_t count;
+	BNReferenceSource* refs = BNGetCodeReferences(m_view, addr, &count);
+
+	vector<ReferenceSource> result;
+	for (size_t i = 0; i < count; i++)
+	{
+		ReferenceSource src;
+		src.func = new Function(BNNewFunctionReference(refs[i].func));
+		src.arch = new CoreArchitecture(refs[i].arch);
+		src.addr = refs[i].addr;
+	}
+
+	BNFreeCodeReferences(refs, count);
+	return result;
+}
+
+
 Ref<Symbol> BinaryView::GetSymbolByAddress(uint64_t addr)
 {
 	BNSymbol* sym = BNGetSymbolByAddress(m_view, addr);
-- 
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