Support section data lookup within static libraries

core/org.eclipse.cdt.core/.settings/.api_filters

@@ -14,4 +14,12 @@
             </message_arguments>
         </filter>
     </resource>
+    <resource path="utils/org/eclipse/cdt/utils/coff/Coff64.java" type="org.eclipse.cdt.utils.coff.Coff64$Symbol">
+        <filter id="336658481">
+            <message_arguments>
+                <message_argument value="org.eclipse.cdt.utils.coff.Coff64.Symbol"/>
+                <message_argument value="SC_EXTERNAL"/>
+            </message_arguments>
+        </filter>
+    </resource>
 </component>

core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/coff/Coff64.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2023 Space Codesign Systems and others.
+ * Copyright (c) 2000, 2024 Space Codesign Systems and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -13,6 +13,7 @@
  *     QNX Software Systems - Initial Coff class
  *     Alexander Fedorov (ArSysOp) - Bug 561992
  *     John Dallaway - Provide additional section header flags (#652)
+ *     John Dallaway - Support offset into archive file (#630)
  *******************************************************************************/
 package org.eclipse.cdt.utils.coff;
 
@@ -329,9 +330,17 @@ file, a new function (as
 
 		RandomAccessFile sfile;
 
-		public SectionHeader(RandomAccessFile file, long offset) throws IOException {
+		private final long objOffset; // the offset of this binary object within the file (eg archive file)
+
+		public SectionHeader(RandomAccessFile file, long hdrOffset) throws IOException {
+			this(file, 0, hdrOffset);
+		}
+
+		/** @since 8.4 */
+		public SectionHeader(RandomAccessFile file, long objOffset, long hdrOffset) throws IOException {
 			sfile = file;
-			file.seek(offset);
+			this.objOffset = objOffset;
+			file.seek(hdrOffset + objOffset);
 			byte[] hdr = new byte[SCNHSZ];
 			file.readFully(hdr);
 			ReadMemoryAccess memory = new ReadMemoryAccess(hdr, true);
@@ -409,7 +418,8 @@ public String toString() {
 		 * @since 5.1
 		 */
 		public ByteBuffer mapSectionData() throws IOException {
-			return sfile.getChannel().map(MapMode.READ_ONLY, s_scnptr, s_paddr).load().asReadOnlyBuffer();
+			long size = s_paddr == 0 ? s_size : s_paddr;
+			return sfile.getChannel().map(MapMode.READ_ONLY, s_scnptr + objOffset, size).load().asReadOnlyBuffer();
 		}
 	}
 
@@ -525,6 +535,9 @@ public static class Symbol {
 		/** @since 5.3 */
 		public final static int T_LNGDBL = 0x16; /* -1 0000 	long double (special case bit pattern) */
 
+		/** @since 8.4 */
+		public static final int SC_EXTERNAL = 2; /* external symbol storage class */
+
 		public byte[] _n_name = new byte[SYMNMLEN]; /* Symbol name, or pointer into
 													string table if symbol name
 													is greater than SYMNMLEN.  */

core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/coff/PE64.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2023 Space Codesign Systems and others.
+ * Copyright (c) 2000, 2024 Space Codesign Systems and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -762,7 +762,7 @@ public SectionHeader[] getSectionHeaders() throws IOException {
 			}
 			offset += FileHeader.FILHSZ + fileHeader.f_opthdr;
 			for (int i = 0; i < scnhdrs.length; i++, offset += SectionHeader.SCNHSZ) {
-				scnhdrs[i] = new SectionHeader(accessFile, offset + peOffset);
+				scnhdrs[i] = new SectionHeader(accessFile, peOffset, offset);
 			}
 		}
 		return scnhdrs;

core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/elf/Elf.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2016 QNX Software Systems and others.
+ * Copyright (c) 2000, 2024 QNX Software Systems and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -11,6 +11,7 @@
  * Contributors:
  *     QNX Software Systems - initial API and implementation
  *     Markus Schorn (Wind River Systems)
+ *     John Dallaway - Support offset into archive file (#630)
  *******************************************************************************/
 package org.eclipse.cdt.utils.elf;
 
@@ -333,12 +334,23 @@ public class Section {
 		public long sh_addralign;
 		public long sh_entsize;
 
+		private final long objOffset; // the offset of this binary object within the file (eg archive file)
+
+		public Section() {
+			this(0);
+		}
+
+		/** @since 8.4 */
+		public Section(long objOffset) {
+			this.objOffset = objOffset;
+		}
+
 		/**
 		 * @since 5.1
 		 */
 		public ByteBuffer mapSectionData() throws IOException {
 			makeSureNotCompressed();
-			return efile.getChannel().map(MapMode.READ_ONLY, sh_offset, sh_size).load().asReadOnlyBuffer();
+			return efile.getChannel().map(MapMode.READ_ONLY, sh_offset + objOffset, sh_size).load().asReadOnlyBuffer();
 		}
 
 		public byte[] loadSectionData() throws IOException {
@@ -1037,7 +1049,7 @@ public Section[] getSections() throws IOException {
 			sections = new Section[length];
 			for (int i = 0; i < length; i++) {
 				efile.seek(ehdr.e_shoff + i * (ehdr.e_shentsize & 0xffff)); // unsigned short
-				sections[i] = new Section();
+				sections[i] = new Section(elfOffset);
 				sections[i].sh_name = efile.readIntE();
 				sections[i].sh_type = efile.readIntE();
 				switch (ehdr.e_ident[ELFhdr.EI_CLASS]) {

core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/elf/parser/ElfBinaryObject.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2015 QNX Software Systems and others.
+ * Copyright (c) 2000, 2024 QNX Software Systems and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -10,6 +10,7 @@
  *
  * Contributors:
  *     QNX Software Systems - Initial API and implementation
+ *     John Dallaway - Fix archive header processing (#630)
  *******************************************************************************/
 package org.eclipse.cdt.utils.elf.parser;
 
@@ -182,6 +183,9 @@ protected void addSymbols(Elf.Symbol[] array, int type, List<Symbol> list) {
 	public <T> T getAdapter(Class<T> adapter) {
 		if (adapter.equals(Elf.class)) {
 			try {
+				if (header != null) {
+					return (T) new Elf(getPath().toOSString(), header.getObjectDataOffset());
+				}
 				return (T) new Elf(getPath().toOSString());
 			} catch (IOException e) {
 			}