ZipTexturePack.java

package net.zhuoweizhang.mcpelauncher;

import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.zip.*;

public class ZipTexturePack implements TexturePack {

	private HashMap<String, ZipEntry> entries = new HashMap<String, ZipEntry>();
	private ZipFile zipFile;
	private File file;

	public ZipTexturePack(File file) throws ZipException, IOException {
		this.file = file;
		this.zipFile = new ZipFile(file);
		putZipEntriesIntoMap();
	}

	private void putZipEntriesIntoMap() {
		Enumeration<? extends ZipEntry> i = zipFile.entries();
		while (i.hasMoreElements()) {
			ZipEntry entry = i.nextElement();
			if (entry.getName().contains("__MACOSX")) continue; //A pox on ye, Mac OS X
			entries.put(getFilenameOnly(entry.getName()), entry);
		}
	}

	public InputStream getInputStream(String fileName) throws IOException {
		ZipEntry realEntry = getEntry(fileName);
		if (realEntry == null) return null;
		return zipFile.getInputStream(realEntry);
	}

	public long getSize(String fileName) throws IOException {
		ZipEntry realEntry = getEntry(fileName);
		if (realEntry == null) return -1;
		return realEntry.getSize();
	}

	private ZipEntry getEntry(String fileName) {
		String name = getFilenameOnly(fileName);
		return entries.get(name);
	}

	public void close() throws IOException {
		zipFile.close();
	}

	private static String getFilenameOnly(String location) {
		String[] segments = location.split("/");
		return segments[segments.length - 1];
	}
}