struct MemoryEditor
{
	enum DataFormat
	{
		DataFormat_Bin = 0,
		DataFormat_Dec = 1,
		DataFormat_Hex = 2,
		DataFormat_COUNT
	};

	// Settings
	bool            Open;                                       // = true   // set to false when DrawWindow() was closed. ignore if not using DrawWindow().
	bool            ReadOnly;                                   // = false  // disable any editing.
	int             Cols;                                       // = 16     // number of columns to display.
	bool            OptShowOptions;                             // = true   // display options button/context menu. when disabled, options will be locked unless you provide your own UI for them.
	bool            OptShowDataPreview;                         // = false  // display a footer previewing the decimal/binary/hex/float representation of the currently selected bytes.
	bool            OptShowHexII;                               // = false  // display values in HexII representation instead of regular hexadecimal: hide null/zero bytes, ascii values as ".X".
	bool            OptShowAscii;                               // = true   // display ASCII representation on the right side.
	bool            OptGreyOutZeroes;                           // = true   // display null/zero bytes using the TextDisabled color.
	bool            OptUpperCaseHex;                            // = true   // display hexadecimal values as "FF" instead of "ff".
	int             OptMidColsCount;                            // = 8      // set to 0 to disable extra spacing between every mid-cols.
	int             OptAddrDigitsCount;                         // = 0      // number of addr digits to display (default calculated based on maximum displayed addr).
	float           OptFooterExtraHeight;                       // = 0      // space to reserve at the bottom of the widget to add custom widgets
	ImU32           HighlightColor;                             //          // background color of highlighted bytes.
	ImU8(*ReadFn)(const ImU8* data, size_t off);    // = 0      // optional handler to read bytes.
	void            (*WriteFn)(ImU8* data, size_t off, ImU8 d); // = 0      // optional handler to write bytes.
	bool            (*HighlightFn)(const ImU8* data, size_t off);//= 0      // optional handler to return Highlight property (to support non-contiguous highlighting).

	// [Internal State]
	bool            ContentsWidthChanged;
	size_t          DataPreviewAddr;
	size_t          DataEditingAddr;
	bool            DataEditingTakeFocus;
	char            DataInputBuf[32];
	char            AddrInputBuf[32];
	size_t          GotoAddr;
	size_t          HighlightMin, HighlightMax;
	int             PreviewEndianess;
	ImGuiDataType   PreviewDataType;

	MemoryEditor()
	{
		// Settings
		Open = true;
		ReadOnly = false;
		Cols = 16;
		OptShowOptions = true;
		OptShowDataPreview = false;
		OptShowHexII = false;
		OptShowAscii = true;
		OptGreyOutZeroes = true;
		OptUpperCaseHex = true;
		OptMidColsCount = 8;
		OptAddrDigitsCount = 0;
		OptFooterExtraHeight = 0.0f;
		HighlightColor = IM_COL32(255, 255, 255, 50);
		ReadFn = NULL;
		WriteFn = NULL;
		HighlightFn = NULL;

		// State/Internals
		ContentsWidthChanged = false;
		DataPreviewAddr = DataEditingAddr = (size_t)-1;
		DataEditingTakeFocus = false;
		memset(DataInputBuf, 0, sizeof(DataInputBuf));
		memset(AddrInputBuf, 0, sizeof(AddrInputBuf));
		GotoAddr = (size_t)-1;
		HighlightMin = HighlightMax = (size_t)-1;
		PreviewEndianess = 0;
		PreviewDataType = ImGuiDataType_S32;
	}

	void GotoAddrAndHighlight(size_t addr_min, size_t addr_max)
	{
		GotoAddr = addr_min;
		HighlightMin = addr_min;
		HighlightMax = addr_max;
	}

	struct Sizes
	{
		int     AddrDigitsCount;
		float   LineHeight;
		float   GlyphWidth;
		float   HexCellWidth;
		float   SpacingBetweenMidCols;
		float   PosHexStart;
		float   PosHexEnd;
		float   PosAsciiStart;
		float   PosAsciiEnd;
		float   WindowWidth;

		Sizes() { memset(this, 0, sizeof(*this)); }
	};

	void CalcSizes(Sizes& s, size_t mem_size, size_t base_display_addr)
	{
		ImGuiStyle& style = ImGui::GetStyle();
		s.AddrDigitsCount = OptAddrDigitsCount;
		if (s.AddrDigitsCount == 0)
			for (size_t n = base_display_addr + mem_size - 1; n > 0; n >>= 4)
				s.AddrDigitsCount++;
		s.LineHeight = ImGui::GetTextLineHeight();
		s.GlyphWidth = ImGui::CalcTextSize("F").x + 1;                  // We assume the font is mono-space
		s.HexCellWidth = (float)(int)(s.GlyphWidth * 2.5f);             // "FF " we include trailing space in the width to easily catch clicks everywhere
		s.SpacingBetweenMidCols = (float)(int)(s.HexCellWidth * 0.25f); // Every OptMidColsCount columns we add a bit of extra spacing
		s.PosHexStart = (s.AddrDigitsCount + 2) * s.GlyphWidth;
		s.PosHexEnd = s.PosHexStart + (s.HexCellWidth * Cols);
		s.PosAsciiStart = s.PosAsciiEnd = s.PosHexEnd;
		if (OptShowAscii)
		{
			s.PosAsciiStart = s.PosHexEnd + s.GlyphWidth * 1;
			if (OptMidColsCount > 0)
				s.PosAsciiStart += (float)((Cols + OptMidColsCount - 1) / OptMidColsCount) * s.SpacingBetweenMidCols;
			s.PosAsciiEnd = s.PosAsciiStart + Cols * s.GlyphWidth;
		}
		s.WindowWidth = s.PosAsciiEnd + style.ScrollbarSize + style.WindowPadding.x * 2 + s.GlyphWidth;
	}

	// Standalone Memory Editor window
	void DrawWindow(const char* title, void* mem_data, size_t mem_size, size_t base_display_addr = 0x0000)
	{
		Sizes s;
		CalcSizes(s, mem_size, base_display_addr);
		ImGui::SetNextWindowSize(ImVec2(s.WindowWidth, s.WindowWidth * 0.60f), ImGuiCond_FirstUseEver);
		ImGui::SetNextWindowSizeConstraints(ImVec2(0.0f, 0.0f), ImVec2(s.WindowWidth, FLT_MAX));

		Open = true;
		if (ImGui::Begin(title, &Open, ImGuiWindowFlags_NoScrollbar))
		{
			if (ImGui::IsWindowHovered(ImGuiHoveredFlags_RootAndChildWindows) && ImGui::IsMouseReleased(ImGuiMouseButton_Right))
				ImGui::OpenPopup("context");
			DrawContents(mem_data, mem_size, base_display_addr);
			if (ContentsWidthChanged)
			{
				CalcSizes(s, mem_size, base_display_addr);
				ImGui::SetWindowSize(ImVec2(s.WindowWidth, ImGui::GetWindowSize().y));
			}
		}
		ImGui::End();
	}

	// Memory Editor contents only
	void DrawContents(void* mem_data_void, size_t mem_size, size_t base_display_addr = 0x0000)
	{
		if (Cols < 1)
			Cols = 1;

		ImU8* mem_data = (ImU8*)mem_data_void;
		Sizes s;
		CalcSizes(s, mem_size, base_display_addr);
		ImGuiStyle& style = ImGui::GetStyle();

		// We begin into our scrolling region with the 'ImGuiWindowFlags_NoMove' in order to prevent click from moving the window.
		// This is used as a facility since our main click detection code doesn't assign an ActiveId so the click would normally be caught as a window-move.
		const float height_separator = style.ItemSpacing.y;
		float footer_height = OptFooterExtraHeight;
		if (OptShowOptions)
			footer_height += height_separator + ImGui::GetFrameHeightWithSpacing() * 1;
		if (OptShowDataPreview)
			footer_height += height_separator + ImGui::GetFrameHeightWithSpacing() * 1 + ImGui::GetTextLineHeightWithSpacing() * 3;
		ImGui::BeginChild("##scrolling", ImVec2(0, -footer_height), false, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoNav);
		ImDrawList* draw_list = ImGui::GetWindowDrawList();

		ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
		ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));

		// We are not really using the clipper API correctly here, because we rely on visible_start_addr/visible_end_addr for our scrolling function.
		const int line_total_count = (int)((mem_size + Cols - 1) / Cols);
		ImGuiListClipper clipper;
		clipper.Begin(line_total_count, s.LineHeight);

		bool data_next = false;

		if (ReadOnly || DataEditingAddr >= mem_size)
			DataEditingAddr = (size_t)-1;
		if (DataPreviewAddr >= mem_size)
			DataPreviewAddr = (size_t)-1;

		size_t preview_data_type_size = OptShowDataPreview ? DataTypeGetSize(PreviewDataType) : 0;

		size_t data_editing_addr_next = (size_t)-1;
		if (DataEditingAddr != (size_t)-1)
		{
			// Move cursor but only apply on next frame so scrolling with be synchronized (because currently we can't change the scrolling while the window is being rendered)
			if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_UpArrow)) && (ptrdiff_t)DataEditingAddr >= (ptrdiff_t)Cols) { data_editing_addr_next = DataEditingAddr - Cols; }
			else if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_DownArrow)) && (ptrdiff_t)DataEditingAddr < (ptrdiff_t)mem_size - Cols) { data_editing_addr_next = DataEditingAddr + Cols; }
			else if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_LeftArrow)) && (ptrdiff_t)DataEditingAddr > (ptrdiff_t)0) { data_editing_addr_next = DataEditingAddr - 1; }
			else if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_RightArrow)) && (ptrdiff_t)DataEditingAddr < (ptrdiff_t)mem_size - 1) { data_editing_addr_next = DataEditingAddr + 1; }
		}

		// Draw vertical separator
		ImVec2 window_pos = ImGui::GetWindowPos();
		if (OptShowAscii)
			draw_list->AddLine(ImVec2(window_pos.x + s.PosAsciiStart - s.GlyphWidth, window_pos.y), ImVec2(window_pos.x + s.PosAsciiStart - s.GlyphWidth, window_pos.y + 9999), ImGui::GetColorU32(ImGuiCol_Border));

		const ImU32 color_text = ImGui::GetColorU32(ImGuiCol_Text);
		const ImU32 color_disabled = OptGreyOutZeroes ? ImGui::GetColorU32(ImGuiCol_TextDisabled) : color_text;

		const char* format_address = OptUpperCaseHex ? "%0*" _PRISizeT "X: " : "%0*" _PRISizeT "x: ";
		const char* format_data = OptUpperCaseHex ? "%0*" _PRISizeT "X" : "%0*" _PRISizeT "x";
		const char* format_byte = OptUpperCaseHex ? "%02X" : "%02x";
		const char* format_byte_space = OptUpperCaseHex ? "%02X " : "%02x ";

		while (clipper.Step())
			for (int line_i = clipper.DisplayStart; line_i < clipper.DisplayEnd; line_i++) // display only visible lines
			{
				size_t addr = (size_t)(line_i * Cols);
				ImGui::Text(format_address, s.AddrDigitsCount, base_display_addr + addr);

				// Draw Hexadecimal
				for (int n = 0; n < Cols && addr < mem_size; n++, addr++)
				{
					float byte_pos_x = s.PosHexStart + s.HexCellWidth * n;
					if (OptMidColsCount > 0)
						byte_pos_x += (float)(n / OptMidColsCount) * s.SpacingBetweenMidCols;
					ImGui::SameLine(byte_pos_x);

					// Draw highlight
					bool is_highlight_from_user_range = (addr >= HighlightMin && addr < HighlightMax);
					bool is_highlight_from_user_func = (HighlightFn && HighlightFn(mem_data, addr));
					bool is_highlight_from_preview = (addr >= DataPreviewAddr && addr < DataPreviewAddr + preview_data_type_size);
					if (is_highlight_from_user_range || is_highlight_from_user_func || is_highlight_from_preview)
					{
						ImVec2 pos = ImGui::GetCursorScreenPos();
						float highlight_width = s.GlyphWidth * 2;
						bool is_next_byte_highlighted = (addr + 1 < mem_size) && ((HighlightMax != (size_t)-1 && addr + 1 < HighlightMax) || (HighlightFn && HighlightFn(mem_data, addr + 1)));
						if (is_next_byte_highlighted || (n + 1 == Cols))
						{
							highlight_width = s.HexCellWidth;
							if (OptMidColsCount > 0 && n > 0 && (n + 1) < Cols && ((n + 1) % OptMidColsCount) == 0)
								highlight_width += s.SpacingBetweenMidCols;
						}
						draw_list->AddRectFilled(pos, ImVec2(pos.x + highlight_width, pos.y + s.LineHeight), HighlightColor);
					}

					if (DataEditingAddr == addr)
					{
						// Display text input on current byte
						bool data_write = false;
						ImGui::PushID((void*)addr);
						if (DataEditingTakeFocus)
						{
							ImGui::SetKeyboardFocusHere(0);
							sprintf(AddrInputBuf, format_data, s.AddrDigitsCount, base_display_addr + addr);
							sprintf(DataInputBuf, format_byte, ReadFn ? ReadFn(mem_data, addr) : mem_data[addr]);
						}
						struct UserData
						{
							// FIXME: We should have a way to retrieve the text edit cursor position more easily in the API, this is rather tedious. This is such a ugly mess we may be better off not using InputText() at all here.
							static int Callback(ImGuiInputTextCallbackData* data)
							{
								UserData* user_data = (UserData*)data->UserData;
								if (!data->HasSelection())
									user_data->CursorPos = data->CursorPos;
								if (data->SelectionStart == 0 && data->SelectionEnd == data->BufTextLen)
								{
									// When not editing a byte, always refresh its InputText content pulled from underlying memory data
									// (this is a bit tricky, since InputText technically "owns" the master copy of the buffer we edit it in there)
									data->DeleteChars(0, data->BufTextLen);
									data->InsertChars(0, user_data->CurrentBufOverwrite);
									data->SelectionStart = 0;
									data->SelectionEnd = 2;
									data->CursorPos = 0;
								}
								return 0;
							}
							char   CurrentBufOverwrite[3];  // Input
							int    CursorPos;               // Output
						};
						UserData user_data;
						user_data.CursorPos = -1;
						sprintf(user_data.CurrentBufOverwrite, format_byte, ReadFn ? ReadFn(mem_data, addr) : mem_data[addr]);
						ImGuiInputTextFlags flags = ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_EnterReturnsTrue | ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_NoHorizontalScroll | ImGuiInputTextFlags_CallbackAlways;
#if IMGUI_VERSION_NUM >= 18104
						flags |= ImGuiInputTextFlags_AlwaysOverwrite;
#else
						flags |= ImGuiInputTextFlags_AlwaysInsertMode;
#endif
						ImGui::SetNextItemWidth(s.GlyphWidth * 2);
						if (ImGui::InputText("##data", DataInputBuf, IM_ARRAYSIZE(DataInputBuf), flags, UserData::Callback, &user_data))
							data_write = data_next = true;
						else if (!DataEditingTakeFocus && !ImGui::IsItemActive())
							DataEditingAddr = data_editing_addr_next = (size_t)-1;
						DataEditingTakeFocus = false;
						if (user_data.CursorPos >= 2)
							data_write = data_next = true;
						if (data_editing_addr_next != (size_t)-1)
							data_write = data_next = false;
						unsigned int data_input_value = 0;
						if (data_write && sscanf(DataInputBuf, "%X", &data_input_value) == 1)
						{
							if (WriteFn)
								WriteFn(mem_data, addr, (ImU8)data_input_value);
							else
								mem_data[addr] = (ImU8)data_input_value;
						}
						ImGui::PopID();
					}
					else
					{
						// NB: The trailing space is not visible but ensure there's no gap that the mouse cannot click on.
						ImU8 b = ReadFn ? ReadFn(mem_data, addr) : mem_data[addr];

						if (OptShowHexII)
						{
							if ((b >= 32 && b < 128))
								ImGui::Text(".%c ", b);
							else if (b == 0xFF && OptGreyOutZeroes)
								ImGui::TextDisabled("## ");
							else if (b == 0x00)
								ImGui::Text("   ");
							else
								ImGui::Text(format_byte_space, b);
						}
						else
						{
							if (b == 0 && OptGreyOutZeroes)
								ImGui::TextDisabled("00 ");
							else
								ImGui::Text(format_byte_space, b);
						}
						if (!ReadOnly && ImGui::IsItemHovered() && ImGui::IsMouseClicked(0))
						{
							DataEditingTakeFocus = true;
							data_editing_addr_next = addr;
						}
					}
				}

				if (OptShowAscii)
				{
					// Draw ASCII values
					ImGui::SameLine(s.PosAsciiStart);
					ImVec2 pos = ImGui::GetCursorScreenPos();
					addr = line_i * Cols;
					ImGui::PushID(line_i);
					if (ImGui::InvisibleButton("ascii", ImVec2(s.PosAsciiEnd - s.PosAsciiStart, s.LineHeight)))
					{
						DataEditingAddr = DataPreviewAddr = addr + (size_t)((ImGui::GetIO().MousePos.x - pos.x) / s.GlyphWidth);
						DataEditingTakeFocus = true;
					}
					ImGui::PopID();
					for (int n = 0; n < Cols && addr < mem_size; n++, addr++)
					{
						if (addr == DataEditingAddr)
						{
							draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), ImGui::GetColorU32(ImGuiCol_FrameBg));
							draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), ImGui::GetColorU32(ImGuiCol_TextSelectedBg));
						}
						unsigned char c = ReadFn ? ReadFn(mem_data, addr) : mem_data[addr];
						char display_c = (c < 32 || c >= 128) ? '.' : c;
						draw_list->AddText(pos, (display_c == c) ? color_text : color_disabled, &display_c, &display_c + 1);
						pos.x += s.GlyphWidth;
					}
				}
			}
		ImGui::PopStyleVar(2);
		ImGui::EndChild();

		// Notify the main window of our ideal child content size (FIXME: we are missing an API to get the contents size from the child)
		ImGui::SetCursorPosX(s.WindowWidth);

		if (data_next && DataEditingAddr + 1 < mem_size)
		{
			DataEditingAddr = DataPreviewAddr = DataEditingAddr + 1;
			DataEditingTakeFocus = true;
		}
		else if (data_editing_addr_next != (size_t)-1)
		{
			DataEditingAddr = DataPreviewAddr = data_editing_addr_next;
			DataEditingTakeFocus = true;
		}

		const bool lock_show_data_preview = OptShowDataPreview;
		if (OptShowOptions)
		{
			ImGui::Separator();
			DrawOptionsLine(s, mem_data, mem_size, base_display_addr);
		}

		if (lock_show_data_preview)
		{
			ImGui::Separator();
			DrawPreviewLine(s, mem_data, mem_size, base_display_addr);
		}
	}

	void DrawOptionsLine(const Sizes& s, void* mem_data, size_t mem_size, size_t base_display_addr)
	{
		IM_UNUSED(mem_data);
		ImGuiStyle& style = ImGui::GetStyle();
		const char* format_range = OptUpperCaseHex ? "Range %0*" _PRISizeT "X..%0*" _PRISizeT "X" : "Range %0*" _PRISizeT "x..%0*" _PRISizeT "x";

		// Options menu
		if (ImGui::Button("Options"))
			ImGui::OpenPopup("context");
		if (ImGui::BeginPopup("context"))
		{
			ImGui::SetNextItemWidth(s.GlyphWidth * 7 + style.FramePadding.x * 2.0f);
			if (ImGui::DragInt("##cols", &Cols, 0.2f, 4, 32, "%d cols")) { ContentsWidthChanged = true; if (Cols < 1) Cols = 1; }
			ImGui::Checkbox("Show Data Preview", &OptShowDataPreview);
			ImGui::Checkbox("Show HexII", &OptShowHexII);
			if (ImGui::Checkbox("Show Ascii", &OptShowAscii)) { ContentsWidthChanged = true; }
			ImGui::Checkbox("Grey out zeroes", &OptGreyOutZeroes);
			ImGui::Checkbox("Uppercase Hex", &OptUpperCaseHex);

			ImGui::EndPopup();
		}

		ImGui::SameLine();
		ImGui::Text(format_range, s.AddrDigitsCount, base_display_addr, s.AddrDigitsCount, base_display_addr + mem_size - 1);
		ImGui::SameLine();
		ImGui::SetNextItemWidth((s.AddrDigitsCount + 1) * s.GlyphWidth + style.FramePadding.x * 2.0f);
		if (ImGui::InputText("##addr", AddrInputBuf, IM_ARRAYSIZE(AddrInputBuf), ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_EnterReturnsTrue))
		{
			size_t goto_addr;
			if (sscanf(AddrInputBuf, "%" _PRISizeT "X", &goto_addr) == 1)
			{
				GotoAddr = goto_addr - base_display_addr;
				HighlightMin = HighlightMax = (size_t)-1;
			}
		}

		if (GotoAddr != (size_t)-1)
		{
			if (GotoAddr < mem_size)
			{
				ImGui::BeginChild("##scrolling");
				ImGui::SetScrollFromPosY(ImGui::GetCursorStartPos().y + (GotoAddr / Cols) * ImGui::GetTextLineHeight());
				ImGui::EndChild();
				DataEditingAddr = DataPreviewAddr = GotoAddr;
				DataEditingTakeFocus = true;
			}
			GotoAddr = (size_t)-1;
		}
	}

	void DrawPreviewLine(const Sizes& s, void* mem_data_void, size_t mem_size, size_t base_display_addr)
	{
		IM_UNUSED(base_display_addr);
		ImU8* mem_data = (ImU8*)mem_data_void;
		ImGuiStyle& style = ImGui::GetStyle();
		ImGui::AlignTextToFramePadding();
		ImGui::Text("Preview as:");
		ImGui::SameLine();
		ImGui::SetNextItemWidth((s.GlyphWidth * 10.0f) + style.FramePadding.x * 2.0f + style.ItemInnerSpacing.x);
		if (ImGui::BeginCombo("##combo_type", DataTypeGetDesc(PreviewDataType), ImGuiComboFlags_HeightLargest))
		{
			for (int n = 0; n < ImGuiDataType_COUNT; n++)
				if (ImGui::Selectable(DataTypeGetDesc((ImGuiDataType)n), PreviewDataType == n))
					PreviewDataType = (ImGuiDataType)n;
			ImGui::EndCombo();
		}
		ImGui::SameLine();
		ImGui::SetNextItemWidth((s.GlyphWidth * 6.0f) + style.FramePadding.x * 2.0f + style.ItemInnerSpacing.x);
		ImGui::Combo("##combo_endianess", &PreviewEndianess, "LE\0BE\0\0");

		char buf[128] = "";
		float x = s.GlyphWidth * 6.0f;
		bool has_value = DataPreviewAddr != (size_t)-1;
		if (has_value)
			DrawPreviewData(DataPreviewAddr, mem_data, mem_size, PreviewDataType, DataFormat_Dec, buf, (size_t)IM_ARRAYSIZE(buf));
		ImGui::Text("Dec"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
		if (has_value)
			DrawPreviewData(DataPreviewAddr, mem_data, mem_size, PreviewDataType, DataFormat_Hex, buf, (size_t)IM_ARRAYSIZE(buf));
		ImGui::Text("Hex"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
		if (has_value)
			DrawPreviewData(DataPreviewAddr, mem_data, mem_size, PreviewDataType, DataFormat_Bin, buf, (size_t)IM_ARRAYSIZE(buf));
		buf[IM_ARRAYSIZE(buf) - 1] = 0;
		ImGui::Text("Bin"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
	}

	// Utilities for Data Preview
	const char* DataTypeGetDesc(ImGuiDataType data_type) const
	{
		const char* descs[] = { "Int8", "Uint8", "Int16", "Uint16", "Int32", "Uint32", "Int64", "Uint64", "Float", "Double" };
		IM_ASSERT(data_type >= 0 && data_type < ImGuiDataType_COUNT);
		return descs[data_type];
	}

	size_t DataTypeGetSize(ImGuiDataType data_type) const
	{
		const size_t sizes[] = { 1, 1, 2, 2, 4, 4, 8, 8, sizeof(float), sizeof(double) };
		IM_ASSERT(data_type >= 0 && data_type < ImGuiDataType_COUNT);
		return sizes[data_type];
	}

	const char* DataFormatGetDesc(DataFormat data_format) const
	{
		const char* descs[] = { "Bin", "Dec", "Hex" };
		IM_ASSERT(data_format >= 0 && data_format < DataFormat_COUNT);
		return descs[data_format];
	}

	bool IsBigEndian() const
	{
		uint16_t x = 1;
		char c[2];
		memcpy(c, &x, 2);
		return c[0] != 0;
	}

	static void* EndianessCopyBigEndian(void* _dst, void* _src, size_t s, int is_little_endian)
	{
		if (is_little_endian)
		{
			uint8_t* dst = (uint8_t*)_dst;
			uint8_t* src = (uint8_t*)_src + s - 1;
			for (int i = 0, n = (int)s; i < n; ++i)
				memcpy(dst++, src--, 1);
			return _dst;
		}
		else
		{
			return memcpy(_dst, _src, s);
		}
	}

	static void* EndianessCopyLittleEndian(void* _dst, void* _src, size_t s, int is_little_endian)
	{
		if (is_little_endian)
		{
			return memcpy(_dst, _src, s);
		}
		else
		{
			uint8_t* dst = (uint8_t*)_dst;
			uint8_t* src = (uint8_t*)_src + s - 1;
			for (int i = 0, n = (int)s; i < n; ++i)
				memcpy(dst++, src--, 1);
			return _dst;
		}
	}

	void* EndianessCopy(void* dst, void* src, size_t size) const
	{
		static void* (*fp)(void*, void*, size_t, int) = NULL;
		if (fp == NULL)
			fp = IsBigEndian() ? EndianessCopyBigEndian : EndianessCopyLittleEndian;
		return fp(dst, src, size, PreviewEndianess);
	}

	const char* FormatBinary(const uint8_t* buf, int width) const
	{
		IM_ASSERT(width <= 64);
		size_t out_n = 0;
		static char out_buf[64 + 8 + 1];
		int n = width / 8;
		for (int j = n - 1; j >= 0; --j)
		{
			for (int i = 0; i < 8; ++i)
				out_buf[out_n++] = (buf[j] & (1 << (7 - i))) ? '1' : '0';
			out_buf[out_n++] = ' ';
		}
		IM_ASSERT(out_n < IM_ARRAYSIZE(out_buf));
		out_buf[out_n] = 0;
		return out_buf;
	}

	// [Internal]
	void DrawPreviewData(size_t addr, const ImU8* mem_data, size_t mem_size, ImGuiDataType data_type, DataFormat data_format, char* out_buf, size_t out_buf_size) const
	{
		uint8_t buf[8];
		size_t elem_size = DataTypeGetSize(data_type);
		size_t size = addr + elem_size > mem_size ? mem_size - addr : elem_size;
		if (ReadFn)
			for (int i = 0, n = (int)size; i < n; ++i)
				buf[i] = ReadFn(mem_data, addr + i);
		else
			memcpy(buf, mem_data + addr, size);

		if (data_format == DataFormat_Bin)
		{
			uint8_t binbuf[8];
			EndianessCopy(binbuf, buf, size);
			ImSnprintf(out_buf, out_buf_size, "%s", FormatBinary(binbuf, (int)size * 8));
			return;
		}

		out_buf[0] = 0;
		switch (data_type)
		{
		case ImGuiDataType_S8:
		{
			int8_t int8 = 0;
			EndianessCopy(&int8, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhd", int8); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", int8 & 0xFF); return; }
			break;
		}
		case ImGuiDataType_U8:
		{
			uint8_t uint8 = 0;
			EndianessCopy(&uint8, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhu", uint8); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", uint8 & 0XFF); return; }
			break;
		}
		case ImGuiDataType_S16:
		{
			int16_t int16 = 0;
			EndianessCopy(&int16, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hd", int16); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", int16 & 0xFFFF); return; }
			break;
		}
		case ImGuiDataType_U16:
		{
			uint16_t uint16 = 0;
			EndianessCopy(&uint16, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hu", uint16); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", uint16 & 0xFFFF); return; }
			break;
		}
		case ImGuiDataType_S32:
		{
			int32_t int32 = 0;
			EndianessCopy(&int32, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%d", int32); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", int32); return; }
			break;
		}
		case ImGuiDataType_U32:
		{
			uint32_t uint32 = 0;
			EndianessCopy(&uint32, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%u", uint32); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", uint32); return; }
			break;
		}
		case ImGuiDataType_S64:
		{
			int64_t int64 = 0;
			EndianessCopy(&int64, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%lld", (long long)int64); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)int64); return; }
			break;
		}
		case ImGuiDataType_U64:
		{
			uint64_t uint64 = 0;
			EndianessCopy(&uint64, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%llu", (long long)uint64); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)uint64); return; }
			break;
		}
		case ImGuiDataType_Float:
		{
			float float32 = 0.0f;
			EndianessCopy(&float32, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", float32); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", float32); return; }
			break;
		}
		case ImGuiDataType_Double:
		{
			double float64 = 0.0;
			EndianessCopy(&float64, buf, size);
			if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", float64); return; }
			if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", float64); return; }
			break;
		}
		case ImGuiDataType_COUNT:
			break;
		} // Switch
		IM_ASSERT(0); // Shouldn't reach
	}
};

#undef _PRISizeT
#undef ImSnprintf

#ifdef _MSC_VER
#pragma warning (pop)
#endif