1 files changed, 68 insertions, 0 deletions
diff --git a/tools/aapt2/ResChunkPullParser.cpp b/tools/aapt2/ResChunkPullParser.cpp
new file mode 100644
index 0000000..78ea60e
--- /dev/null
+++ b/tools/aapt2/ResChunkPullParser.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ResChunkPullParser.h"
+
+#include <androidfw/ResourceTypes.h>
+#include <cstddef>
+
+namespace aapt {
+
+using android::ResChunk_header;
+
+ResChunkPullParser::Event ResChunkPullParser::next() {
+    if (!isGoodEvent(mEvent)) {
+        return mEvent;
+    }
+
+    if (mEvent == Event::StartDocument) {
+        mCurrentChunk = mData;
+    } else {
+        mCurrentChunk = reinterpret_cast<const ResChunk_header*>(
+                reinterpret_cast<const char*>(mCurrentChunk) + mCurrentChunk->size);
+    }
+
+    const std::ptrdiff_t diff = reinterpret_cast<const char*>(mCurrentChunk)
+            - reinterpret_cast<const char*>(mData);
+    assert(diff >= 0 && "diff is negative");
+    const size_t offset = static_cast<const size_t>(diff);
+
+    if (offset == mLen) {
+        mCurrentChunk = nullptr;
+        return (mEvent = Event::EndDocument);
+    } else if (offset + sizeof(ResChunk_header) > mLen) {
+        mLastError = "chunk is past the end of the document";
+        mCurrentChunk = nullptr;
+        return (mEvent = Event::BadDocument);
+    }
+
+    if (mCurrentChunk->headerSize < sizeof(ResChunk_header)) {
+        mLastError = "chunk has too small header";
+        mCurrentChunk = nullptr;
+        return (mEvent = Event::BadDocument);
+    } else if (mCurrentChunk->size < mCurrentChunk->headerSize) {
+        mLastError = "chunk's total size is smaller than header";
+        mCurrentChunk = nullptr;
+        return (mEvent = Event::BadDocument);
+    } else if (offset + mCurrentChunk->size > mLen) {
+        mLastError = "chunk's data extends past the end of the document";
+        mCurrentChunk = nullptr;
+        return (mEvent = Event::BadDocument);
+    }
+    return (mEvent = Event::Chunk);
+}
+
+} // namespace aapt