fix(res): implemented parsing RES_TABLE_TYPE_LIBRARY chunks (#1663)(PR …

…#1664) * core: Implemented parsing RES_TABLE_TYPE_LIBRARY chunks * skip unknown data at the end of type chunk
skylot · Sep 10, 2022 · b507065 · b507065
1 parent 9114821
commit b507065
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Showing 2 changed files with 60 additions and 13 deletions.
diff --git a/jadx-core/src/main/java/jadx/core/xmlgen/ParserConstants.java b/jadx-core/src/main/java/jadx/core/xmlgen/ParserConstants.java
@@ -28,9 +28,12 @@ protected ParserConstants() {
 	protected static final int RES_XML_LAST_CHUNK_TYPE = 0x017f;
 	protected static final int RES_XML_RESOURCE_MAP_TYPE = 0x0180;
 
-	protected static final int RES_TABLE_PACKAGE_TYPE = 0x0200;
-	protected static final int RES_TABLE_TYPE_TYPE = 0x0201;
-	protected static final int RES_TABLE_TYPE_SPEC_TYPE = 0x0202;
+	protected static final int RES_TABLE_PACKAGE_TYPE = 0x0200; // 512
+	protected static final int RES_TABLE_TYPE_TYPE = 0x0201; // 513
+	protected static final int RES_TABLE_TYPE_SPEC_TYPE = 0x0202; // 514
+	protected static final int RES_TABLE_TYPE_LIBRARY = 0x0203; // 515
+	protected static final int RES_TABLE_TYPE_OVERLAY = 0x0204; // 516
+	protected static final int RES_TABLE_TYPE_STAGED_ALIAS = 0x0206; // 517
 
 	/**
 	 * Type constants

diff --git a/jadx-core/src/main/java/jadx/core/xmlgen/ResTableParser.java b/jadx-core/src/main/java/jadx/core/xmlgen/ResTableParser.java
@@ -153,13 +153,28 @@ private PackageChunk parsePackage() throws IOException {
 		while (is.getPos() < endPos) {
 			long chunkStart = is.getPos();
 			int type = is.readInt16();
-			if (type == RES_NULL_TYPE) {
-				continue;
-			}
-			if (type == RES_TABLE_TYPE_SPEC_TYPE) {
-				parseTypeSpecChunk();
-			} else if (type == RES_TABLE_TYPE_TYPE) {
-				parseTypeChunk(chunkStart, pkg);
+			LOG.trace("res package chunk start at {} type {}", chunkStart, type);
+			switch (type) {
+				case RES_NULL_TYPE:
+					LOG.info("Null chunk type encountered at offset {}", chunkStart);
+					break;
+				case RES_TABLE_TYPE_TYPE: // 0x0201
+					parseTypeChunk(chunkStart, pkg);
+					break;
+				case RES_TABLE_TYPE_SPEC_TYPE: // 0x0202
+					parseTypeSpecChunk(chunkStart);
+					break;
+				case RES_TABLE_TYPE_LIBRARY: // 0x0203
+					parseLibraryTypeChunk(chunkStart);
+					break;
+				case RES_TABLE_TYPE_OVERLAY: // 0x0204
+					throw new IOException(
+							String.format("Encountered unsupported chunk type TYPE_OVERLAY at offset 0x%x ", chunkStart));
+				case RES_TABLE_TYPE_STAGED_ALIAS: // 0x0206
+					throw new IOException(
+							String.format("Encountered unsupported chunk type TYPE_STAGED_ALIAS at offset 0x%x ", chunkStart));
+				default:
+					LOG.warn("Unknown chunk type {} encountered at offset {}", type, chunkStart);
 			}
 		}
 		return pkg;
@@ -192,17 +207,39 @@ private String makeNewKeyName(int idx) {
 	}
 
 	@SuppressWarnings("unused")
-	private void parseTypeSpecChunk() throws IOException {
+	private void parseTypeSpecChunk(long chunkStart) throws IOException {
 		is.checkInt16(0x0010, "Unexpected type spec header size");
-		/* int size = */
-		is.readInt32();
+		int chunkSize = is.readInt32();
+		long expectedEndPos = chunkStart + chunkSize;
 
 		int id = is.readInt8();
 		is.skip(3);
 		int entryCount = is.readInt32();
 		for (int i = 0; i < entryCount; i++) {
 			int entryFlag = is.readInt32();
 		}
+		if (is.getPos() != expectedEndPos) {
+			throw new IOException(String.format("Error reading type spec chunk at offset 0x%x", chunkStart));
+		}
+	}
+
+	private void parseLibraryTypeChunk(long chunkStart) throws IOException {
+		LOG.trace("parsing library type chunk starting at offset {}", chunkStart);
+		is.checkInt16(12, "Unexpected header size");
+		int chunkSize = is.readInt32();
+		long expectedEndPos = chunkStart + chunkSize;
+		int count = is.readInt32();
+		for (int i = 0; i < count; i++) {
+			int packageId = is.readInt32();
+			String packageName = is.readString16Fixed(128);
+			LOG.info("Found resource shared library {}, pkgId: {}", packageName, packageId);
+			if (is.getPos() > expectedEndPos) {
+				throw new IOException("reading after chunk end");
+			}
+		}
+		if (is.getPos() != expectedEndPos) {
+			throw new IOException(String.format("Error reading library chunk at offset 0x%x", chunkStart));
+		}
 	}
 
 	private void parseTypeChunk(long start, PackageChunk pkg) throws IOException {
@@ -241,6 +278,13 @@ private void parseTypeChunk(long start, PackageChunk pkg) throws IOException {
 				parseEntry(pkg, id, i, config.getQualifiers());
 			}
 		}
+		if (chunkEnd > is.getPos()) {
+			// Skip remaining unknown data in this chunk (e.g. type 8 entries")
+			long skipSize = chunkEnd - is.getPos();
+			LOG.debug("Unknown data at the end of type chunk encountered, skipping {} bytes and continuing at offset {}", skipSize,
+					chunkEnd);
+			is.skip(skipSize);
+		}
 	}
 
 	private void parseEntry(PackageChunk pkg, int typeId, int entryId, String config) throws IOException {