com.phonegap.plugins.xapkreader.XAPKReader.java Source code

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Here is the source code for com.phonegap.plugins.xapkreader.XAPKReader.java

Source

/**
 * cordova is available under *either* the terms of the modified BSD license *or* the
 * MIT License (2008). See http://opensource.org/licenses/alphabetical for full text.
 *
 * Copyright (c) Quentin Aupetit 2013
 */

package com.phonegap.plugins.xapkreader;

import java.io.BufferedInputStream;
import java.io.IOException;

import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin;
import org.apache.cordova.PluginResult;
import org.json.JSONArray;
import org.json.JSONException;

import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.util.Base64;
import android.util.Log;

import com.android.vending.expansion.zipfile.APKExpansionSupport;
import com.android.vending.expansion.zipfile.ZipResourceFile;
import com.google.android.vending.expansion.downloader.Helpers;

public class XAPKReader extends CordovaPlugin {
    final static int mainVersion = 1;
    final static int patchVersion = 1;

    @Override
    public boolean execute(String action, JSONArray args, final CallbackContext callbackContext)
            throws JSONException {
        if (action.equals("get")) {
            final String filename = args.getString(0);
            try {
                Context ctx = cordova.getActivity().getApplicationContext();
                // Read file as array buffer
                byte[] data = XAPKReader.readFile(ctx, filename);
                if (null != data) {
                    // Encode to Base64 string
                    String encoded = Base64.encodeToString(data, Base64.DEFAULT);
                    // Return file data as base64 string
                    callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, encoded));
                } else {
                    callbackContext.error("File not found.");
                }
            } catch (Exception e) {
                e.printStackTrace();
                callbackContext.error(e.getMessage());
            }
            return true;
        }
        return false;
    }

    private static byte[] readFile(Context ctx, String filename) throws IOException {
        // Get APKExpensionFile
        ZipResourceFile expansionFile = APKExpansionSupport.getAPKExpansionZipFile(ctx, XAPKReader.mainVersion,
                XAPKReader.patchVersion);

        if (null == expansionFile) {
            Log.e("XAPKReader", "APKExpansionFile not found.");
            return null;
        }

        // Find file in ExpansionFile
        String fileName = Helpers.getExpansionAPKFileName(ctx, true, XAPKReader.patchVersion);
        fileName = fileName.substring(0, fileName.lastIndexOf("."));
        AssetFileDescriptor file = expansionFile.getAssetFileDescriptor(fileName + "/" + filename);

        if (null == file) {
            Log.e("XAPKReader", "File not found (" + filename + ").");
            return null;
        }

        // Read file
        int size = (int) file.getLength();
        byte[] data = new byte[size];
        BufferedInputStream buf = new BufferedInputStream(file.createInputStream());
        buf.read(data, 0, data.length);
        buf.close();

        return data;
    }
}