Cleanup some IO overhead

app/src/main/cpp/archive.c

@@ -459,7 +459,7 @@ Java_com_hippo_UriArchiveAccessor_getFilename(JNIEnv *env, jobject thiz, jint in
 }
 
 JNIEXPORT void JNICALL
-Java_com_hippo_UriArchiveAccessor_extractToFd(JNIEnv *env, jobject thiz, jint index, jobject fd) {
+Java_com_hippo_UriArchiveAccessor_extractToFd(JNIEnv *env, jobject thiz, jint index, jint fd) {
     EH_UNUSED(env);
     EH_UNUSED(thiz);
     index = entries[index].index;
@@ -467,10 +467,7 @@ Java_com_hippo_UriArchiveAccessor_extractToFd(JNIEnv *env, jobject thiz, jint in
     int ret;
     ret = archive_get_ctx(&ctx, index);
     if (!ret) {
-        jclass fdClass = (*env)->FindClass(env, "java/io/FileDescriptor");
-        jfieldID fdClassDescriptorFieldID = (*env)->GetFieldID(env, fdClass, "descriptor", "I");
-        int realfd = (*env)->GetIntField(env, fd, fdClassDescriptorFieldID);
-        archive_read_data_into_fd(ctx->arc, realfd);
+        archive_read_data_into_fd(ctx->arc, fd);
         ctx->using = 0;
     }
 }

app/src/main/java/com/hippo/UriArchiveAccessor.kt

@@ -34,7 +34,7 @@ class UriArchiveAccessor(ctx: Context, private val uri: Uri) {
 
     private external fun openArchive(fd: Int, size: Long): Int
     private external fun extractToByteBuffer(index: Int): ByteBuffer?
-    external fun extractToFd(index: Int, fd: FileDescriptor)
+    external fun extractToFd(index: Int, fd: Int)
     external fun getFilename(index: Int): String
     external fun needPassword(): Boolean
     external fun providePassword(str: String): Boolean

app/src/main/java/com/hippo/ehviewer/gallery/ArchivePageLoader.kt

@@ -144,7 +144,7 @@ class ArchivePageLoader(context: Context, uri: Uri, passwdFlow: Flow<String>) :
             e.printStackTrace()
             return false
         }
-        archiveAccessor.extractToFd(index, fd.fileDescriptor)
+        archiveAccessor.extractToFd(index, fd.fd)
         try {
             fd.close()
         } catch (e: IOException) {