Add clipboard option for byte source offset

Fix docs for byte source offset clipboard

Fix variable names for byte source offset clipboard

Copy <NO_OFFSET> if address is not backed by a file

Change final BYTE_SOURCE_OFFSET_TYPE name to be more consistent

Author: Austen Adler

Ghidra/Features/Base/src/main/help/help/topics/ClipboardPlugin/Clipboard.htm

@@ -182,6 +182,10 @@ <H3>Listing</H3>
         current selection.   The text is formatted to show the offset from the entry point of the
         function, for example: <CODE>main + 0x2</CODE></LI>
 
+        <LI><B>Byte Source Offset</B> - Copies the byte source offset from the start of the file for 
+        each address in the current selection. If the address is not backed by a file, 
+        <CODE>%3CNO_OFFSET%3E</CODE> is copied.</LI>
+        
 	<LI><B>GhidraURL</B> <A name="GhidraURL"></A> - Creates a GhidraURL for the address under the 
 	cursor then copies that URL to the clipboard.</LI>
       </UL>

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/clipboard/CodeBrowserClipboardProvider.java

@@ -44,10 +44,12 @@
 import ghidra.framework.cmd.Command;
 import ghidra.framework.model.DomainFile;
 import ghidra.framework.plugintool.PluginTool;
+import ghidra.program.database.mem.AddressSourceInfo;
 import ghidra.program.database.symbol.CodeSymbol;
 import ghidra.program.database.symbol.FunctionSymbol;
 import ghidra.program.model.address.*;
 import ghidra.program.model.listing.*;
+import ghidra.program.model.mem.Memory;
 import ghidra.program.model.symbol.*;
 import ghidra.program.util.*;
 import ghidra.util.Msg;
@@ -65,6 +67,8 @@ public class CodeBrowserClipboardProvider extends ByteCopier
 		new ClipboardType(DataFlavor.stringFlavor, "Address");
 	public static final ClipboardType ADDRESS_TEXT_WITH_OFFSET_TYPE =
 		new ClipboardType(DataFlavor.stringFlavor, "Address w/ Offset");
+	public static final ClipboardType BYTE_SOURCE_OFFSET_TYPE =
+		new ClipboardType(DataFlavor.stringFlavor, "Byte Source Offset");
 	public static final ClipboardType CODE_TEXT_TYPE =
 		new ClipboardType(DataFlavor.stringFlavor, "Formatted Code");
 	public static final ClipboardType LABELS_COMMENTS_TYPE =
@@ -94,6 +98,7 @@ private static List<ClipboardType> createCopyTypesList() {
 		list.add(CPP_BYTE_ARRAY_TYPE);
 		list.add(ADDRESS_TEXT_TYPE);
 		list.add(ADDRESS_TEXT_WITH_OFFSET_TYPE);
+		list.add(BYTE_SOURCE_OFFSET_TYPE);
 
 		return list;
 	}
@@ -221,6 +226,9 @@ public Transferable copySpecial(ClipboardType copyType, TaskMonitor monitor) {
 		else if (copyType == ADDRESS_TEXT_WITH_OFFSET_TYPE) {
 			return copySymbolString(monitor);
 		}
+		else if (copyType == BYTE_SOURCE_OFFSET_TYPE) {
+			return copyByteSourceOffset(monitor);
+		}
 		else if (copyType == CODE_TEXT_TYPE) {
 			return copyCode(monitor);
 		}
@@ -382,6 +390,29 @@ else if (delta > 0) {
 		return createStringTransferable(StringUtils.join(strings, "\n"));
 	}
 
+	private	Transferable copyByteSourceOffset(TaskMonitor monitor) {
+		AddressSetView addrs = getSelectedAddresses();
+		Memory currentMemory = currentProgram.getMemory();
+		List<String> strings = new ArrayList<>();
+		AddressIterator	addresses = addrs.getAddresses(true);
+		while (addresses.hasNext() && !monitor.isCancelled()) {
+			AddressSourceInfo addressSourceInfo = currentMemory.getAddressSourceInfo(addresses.next());
+			if (addressSourceInfo != null) {
+				long fileOffset	= addressSourceInfo.getFileOffset();
+				String fileOffsetString;
+
+				if (fileOffset == -1) {
+					fileOffsetString = "<NO_OFFSET>";
+				} else {
+					fileOffsetString = String.format("%x", addressSourceInfo.getFileOffset());
+				}
+
+				strings.add(fileOffsetString);
+			}
+		}
+		return createStringTransferable(StringUtils.join(strings, "\n"));
+	}
+
 	protected Transferable copyCode(TaskMonitor monitor) {
 
 		AddressSetView addressSet = getSelectedAddresses();