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lib.c
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lib.c
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#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <jni.h>
#include <android/log.h>
#include "android.h"
void *jni_get_assets_file(JNIEnv *env, jobject ctx, char *filename, int *length) {
(*env)->PushLocalFrame(env, 10);
jmethodID get_assets_m = (*env)->GetMethodID(env, (*env)->GetObjectClass(env, ctx), "getAssets", "()Landroid/content/res/AssetManager;");
jobject asset_manager = (*env)->CallObjectMethod(env, ctx, get_assets_m);
jstring jfile = (*env)->NewStringUTF(env, filename);
jmethodID open_m = (*env)->GetMethodID(env, (*env)->GetObjectClass(env, asset_manager), "open", "(Ljava/lang/String;)Ljava/io/InputStream;");
jobject input_stream = (*env)->CallObjectMethod(env, asset_manager, open_m, jfile);
jmethodID close_m = (*env)->GetMethodID(env, (*env)->FindClass(env, "java/io/InputStream"), "close", "()V");
jmethodID read_m = (*env)->GetMethodID(env, (*env)->FindClass(env, "java/io/InputStream"), "read", "([B)I");
jmethodID available_m = (*env)->GetMethodID(env, (*env)->FindClass(env, "java/io/InputStream"), "available", "()I");
int file_size = (*env)->CallIntMethod(env, input_stream, available_m);
jbyteArray buffer = (*env)->NewByteArray(env, file_size);
(*env)->CallIntMethod(env, input_stream, read_m, buffer);
(*env)->CallVoidMethod(env, input_stream, close_m);
jbyte *bytes = (*env)->GetByteArrayElements(env, buffer, 0);
(*length) = file_size;
void *new = malloc(*length);
memcpy(new, bytes, *length);
(*env)->DeleteLocalRef(env, jfile);
(*env)->ReleaseByteArrayElements(env, buffer, bytes, 0);
(*env)->PopLocalFrame(env, NULL);
return new;
}
void *jni_get_txt_file(JNIEnv *env, jobject ctx, char *filename) {
int length = 0;
char *bytes = jni_get_assets_file(env, ctx, filename, &length);
bytes = realloc(bytes, length + 1);
bytes[length] = '\0';
return bytes;
}
const char *jni_get_external_storage_path(JNIEnv *env) {
(*env)->PushLocalFrame(env, 10);
// Get File object for the external storage directory.
jclass environment_c = (*env)->FindClass(env, "android/os/Environment");
jmethodID method = (*env)->GetStaticMethodID(env, environment_c, "getExternalStorageDirectory", "()Ljava/io/File;");
jobject file_obj = (*env)->CallStaticObjectMethod(env, environment_c, method);
jmethodID get_path_m = (*env)->GetMethodID(env, (*env)->GetObjectClass(env, file_obj), "getAbsolutePath", "()Ljava/lang/String;");
jstring path = (*env)->CallObjectMethod(env, file_obj, get_path_m);
(*env)->DeleteLocalRef(env, file_obj);
path = (*env)->PopLocalFrame(env, path);
return (*env)->GetStringUTFChars(env, path, 0);
}
jobject jni_get_pref(JNIEnv *env, jobject ctx, char *key) {
(*env)->PushLocalFrame(env, 10);
jclass shared_pref_c = (*env)->FindClass(env, "android/content/SharedPreferences");
jmethodID get_string_m = (*env)->GetMethodID(env, shared_pref_c, "getString", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;");
jmethodID get_pref_m = (*env)->GetMethodID(env, (*env)->GetObjectClass(env, ctx), "getSharedPreferences", "(Ljava/lang/String;I)Landroid/content/SharedPreferences;");
jstring package_name_s = jni_get_package_name(env, ctx);
jobject pref_o = (*env)->CallObjectMethod(env, ctx, get_pref_m, package_name_s, ANDROID_MODE_PRIVATE);
jstring path = jni_concat_strings3(env, package_name_s, (*env)->NewStringUTF(env, "."), (*env)->NewStringUTF(env, key));
jstring value = (*env)->CallObjectMethod(env, pref_o, get_string_m, path, NULL);
(*env)->PopLocalFrame(env, NULL);
return value;
}
jobject jni_set_pref_str(JNIEnv *env, jobject ctx, char *key, char *str) {
(*env)->PushLocalFrame(env, 10);
jclass shared_pref_c = (*env)->FindClass(env, "android/content/SharedPreferences");
jclass shared_pref_editor_c = (*env)->FindClass(env, "android/content/SharedPreferences$Editor");
jmethodID edit_m = (*env)->GetMethodID(env, shared_pref_c, "edit", "()Landroid/content/SharedPreferences$Editor;");
jmethodID get_pref_m = (*env)->GetMethodID(env, (*env)->GetObjectClass(env, ctx), "getSharedPreferences", "(Ljava/lang/String;I)Landroid/content/SharedPreferences;");
jstring package_name_s = jni_get_package_name(env, ctx);
jobject pref_o = (*env)->CallObjectMethod(env, ctx, get_pref_m, package_name_s, ANDROID_MODE_PRIVATE);
jstring editor_o = (*env)->CallObjectMethod(env, pref_o, edit_m);
jmethodID put_string_m = (*env)->GetMethodID(env, shared_pref_editor_c, "putString", "(Ljava/lang/String;Ljava/lang/String;)Landroid/content/SharedPreferences$Editor;");
jstring path = jni_concat_strings3(env, package_name_s, (*env)->NewStringUTF(env, "."), (*env)->NewStringUTF(env, key));
jstring value = (*env)->CallObjectMethod(env, editor_o, put_string_m, path, (*env)->NewStringUTF(env, str));
(*env)->PopLocalFrame(env, NULL);
return value;
}
// Added in POSIX 2008, not C standard
__attribute__((weak))
char *stpcpy(char *dst, const char *src) {
const size_t len = strlen(src);
return (char *)memcpy (dst, src, len + 1) + len;
}