CacheVerifier.java

package net.scapeemulator.cache.tools;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.zip.CRC32;

import net.scapeemulator.cache.Container;
import net.scapeemulator.cache.FileStore;
import net.scapeemulator.cache.ReferenceTable;
import net.scapeemulator.cache.ReferenceTable.Entry;

public final class CacheVerifier {

	public static void main(String[] args) throws IOException {
		try (FileStore store = FileStore.open("../game/data/cache/")) {
			for (int type = 0; type < store.getFileCount(255); type++) {
				ReferenceTable table = ReferenceTable.decode(Container.decode(store.read(255, type)).getData());
				for (int file = 0; file < table.capacity(); file++) {
					Entry entry = table.getEntry(file);
					if (entry == null)
						continue;

					ByteBuffer buffer;
					try {
						buffer = store.read(type, file);
					} catch (IOException ex) {
						System.out.println(type+":"+file+ " error");
						continue;
					}

					if (buffer.capacity() <= 2) {
						System.out.println(type+":"+file+ " missing");
						continue;
					}

					byte[] bytes = new byte[buffer.limit() - 2]; // last two bytes are the version and shouldn't be included
					buffer.position(0);
					buffer.get(bytes, 0, bytes.length);

					CRC32 crc = new CRC32();
					crc.update(bytes, 0, bytes.length);

					if ((int) crc.getValue() != entry.getCrc()) {
						System.out.println(type+":"+file+ " corrupt");
					}

					buffer.position(buffer.limit() - 2);
					if ((buffer.getShort() & 0xFFFF) != entry.getVersion()) {
						System.out.println(type+":"+file+ " out of date");
					}
				}
			}
		}
	}

}