Add Methods to JNI Code in Tor Fork

[bitmold]

Would be nice to be able to display Orbot's dependencies on the about screen. I'm not sure how to get code into the guardian project fork of tor. Could you please add this @uniqx

org_torproject_jni_TorService.h

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_libeventVersion
  (JNIEnv *env, jobject obj);

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_opensslVersion
  (JNIEnv *env, jobject obj);

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_zlibVersion
  (JNIEnv *env, jobject obj);

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_zstdVersion
  (JNIEnv *env, jobject obj);

for org_torproject_jni_TorService.c
these #includes

#include "lib/compress/compress.h"
#include "lib/crypt_ops/crypto_init.h"
#include "lib/evloop/procmon.h"

and these methods at the bottom:

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_libeventVersion
  (JNIEnv *env, jobject obj) {
    return  (*env)->NewStringUTF(env, tor_libevent_get_version_str());
}

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_opensslVersion
  (JNIEnv *env, jobject obj) {
    return  (*env)->NewStringUTF(env, crypto_get_library_version_string());
}

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_zlibVersion
  (JNIEnv *env, jobject obj) {
    return  (*env)->NewStringUTF(env, tor_compress_version_str(ZLIB_METHOD));
}

JNIEXPORT jstring JNICALL Java_org_torproject_jni_TorService_zstdVersion
  (JNIEnv *env, jobject obj) {
    return  (*env)->NewStringUTF(env, tor_compress_version_str(ZSTD_METHOD));
}

[bitmold]

I've tested this in tor-android with the additional Java and it works fine.

[syphyr]

UNUSED(obj); should be added to each function in org_torproject_jni_TorService.c
syphyr/tor@4d3b8ff

[syphyr]

After adding JNI functions to tor, I have everything working in Orbot with the following changes:
syphyr@8af0be8
syphyr/orbot@a429587