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package org.brotli.wrapper.android;
import android.content.Context;
import android.os.Build;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipFile;
public class JniHelper {
// Should be set on application start.
static Context context = null;
private static final String LIB_NAME = "native";
private static void tryInitialize() {
try {
System.loadLibrary(LIB_NAME);
} catch (UnsatisfiedLinkError e) {
if (context == null) {
throw e;
}
int sdk = Build.VERSION.SDK_INT;
boolean tryFallback =
(sdk >= Build.VERSION_CODES.JELLY_BEAN) && (sdk <= Build.VERSION_CODES.KITKAT);
if (!tryFallback) {
throw e;
}
try {
String libraryFileName = "lib" + LIB_NAME + ".so";
String libraryFullPath = context.getFilesDir() + File.separator + libraryFileName;
File file = new File(libraryFullPath);
if (!file.exists()) {
String apkPath = context.getApplicationInfo().sourceDir;
String pathInApk = "lib/" + Build.CPU_ABI + "/lib" + LIB_NAME + ".so";
unzip(apkPath, pathInApk, libraryFullPath);
}
System.load(libraryFullPath);
} catch (UnsatisfiedLinkError unsatisfiedLinkError) {
throw unsatisfiedLinkError;
} catch (Throwable t) {
UnsatisfiedLinkError unsatisfiedLinkError = new UnsatisfiedLinkError(
"Exception while extracting native library: " + t.getMessage());
unsatisfiedLinkError.initCause(t);
throw unsatisfiedLinkError;
}
}
}
private static final Object mutex = new Object();
private static volatile boolean alreadyInitialized;
public static void ensureInitialized() {
synchronized (mutex) {
if (!alreadyInitialized) {
// If failed, do not retry.
alreadyInitialized = true;
tryInitialize();
}
}
}
private static void unzip(String zipFileName, String entryName, String outputFileName)
throws IOException {
ZipFile zipFile = new ZipFile(zipFileName);
try {
InputStream input = zipFile.getInputStream(zipFile.getEntry(entryName));
OutputStream output = new FileOutputStream(outputFileName);
byte[] data = new byte[16384];
int len;
while ((len = input.read(data)) != -1) {
output.write(data, 0, len);
}
output.close();
input.close();
} finally {
zipFile.close();
}
}
}
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