src/core/android/SDL_android.cpp
author Tim Angus <tim@blackcompanystudios.co.uk>
Fri, 26 Aug 2011 13:23:40 +0100
changeset 6189 b5a665fbaedc
parent 6186 e565ac981de6
child 6191 2c0d35b1af4e
permissions -rwxr-xr-x
* Take a global reference to the activity to prevent the reference being GCed
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#include "SDL_stdinc.h"
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#ifdef __ANDROID__
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#include "SDL_android.h"
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extern "C" {
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#include "../../events/SDL_events_c.h"
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#include "../../video/android/SDL_androidkeyboard.h"
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#include "../../video/android/SDL_androidtouch.h"
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#include "../../video/android/SDL_androidvideo.h"
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#include <android/log.h>
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#define LOG_TAG "SDL_android"
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//#define LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
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//#define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
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#define LOGI(...) do {} while (false)
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#define LOGE(...) do {} while (false)
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/* Impelemented in audio/android/SDL_androidaudio.c */
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extern void Android_RunAudioThread();
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} // C
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/*******************************************************************************
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 This file links the Java side of Android with libsdl
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*******************************************************************************/
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#include <jni.h>
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#include <android/log.h>
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/*******************************************************************************
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                               Globals
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*******************************************************************************/
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static JNIEnv* mEnv = NULL;
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static JNIEnv* mAudioEnv = NULL;
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static JavaVM* mJavaVM;
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// Main activity
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static jclass mActivityClass;
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// method signatures
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static jmethodID midCreateGLContext;
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static jmethodID midFlipBuffers;
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static jmethodID midAudioInit;
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static jmethodID midAudioWriteShortBuffer;
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static jmethodID midAudioWriteByteBuffer;
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static jmethodID midAudioQuit;
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// Accelerometer data storage
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static float fLastAccelerometer[3];
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/*******************************************************************************
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                 Functions called by JNI
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*******************************************************************************/
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// Library init
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extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
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{
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    JNIEnv *env;
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    mJavaVM = vm;
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    LOGI("JNI_OnLoad called");
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    if (mJavaVM->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
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        LOGE("Failed to get the environment using GetEnv()");
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        return -1;
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    }
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    return JNI_VERSION_1_4;
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}
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// Called before SDL_main() to initialize JNI bindings
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extern "C" void SDL_Android_Init(JNIEnv* env, jclass cls)
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{
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");
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    mEnv = env;
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    mActivityClass = (jclass)env->NewGlobalRef(cls);
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    midCreateGLContext = mEnv->GetStaticMethodID(mActivityClass,
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                                "createGLContext","(II)Z");
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    midFlipBuffers = mEnv->GetStaticMethodID(mActivityClass,
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                                "flipBuffers","()V");
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    midAudioInit = mEnv->GetStaticMethodID(mActivityClass, 
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                                "audioInit", "(IZZI)Ljava/lang/Object;");
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    midAudioWriteShortBuffer = mEnv->GetStaticMethodID(mActivityClass,
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                                "audioWriteShortBuffer", "([S)V");
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    midAudioWriteByteBuffer = mEnv->GetStaticMethodID(mActivityClass,
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                                "audioWriteByteBuffer", "([B)V");
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    midAudioQuit = mEnv->GetStaticMethodID(mActivityClass,
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                                "audioQuit", "()V");
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    if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||
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       !midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {
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        __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL: Couldn't locate Java callbacks, check that they're named and typed correctly");
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    }
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init() finished!");
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}
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// Resize
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
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                                    JNIEnv* env, jclass jcls,
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                                    jint width, jint height, jint format)
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{
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    Android_SetScreenResolution(width, height, format);
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}
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// Keydown
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(
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                                    JNIEnv* env, jclass jcls, jint keycode)
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{
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    Android_OnKeyDown(keycode);
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}
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// Keyup
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
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                                    JNIEnv* env, jclass jcls, jint keycode)
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{
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    Android_OnKeyUp(keycode);
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}
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// Touch
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(
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                                    JNIEnv* env, jclass jcls,
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                                    jint touch_device_id_in, jint pointer_finger_id_in,
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                                    jint action, jfloat x, jfloat y, jfloat p)
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{
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    Android_OnTouch(touch_device_id_in, pointer_finger_id_in, action, x, y, p);
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}
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// Accelerometer
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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                                    JNIEnv* env, jclass jcls,
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                                    jfloat x, jfloat y, jfloat z)
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{
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    fLastAccelerometer[0] = x;
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    fLastAccelerometer[1] = y;
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    fLastAccelerometer[2] = z;   
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}
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// Quit
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(
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                                    JNIEnv* env, jclass cls)
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{    
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    // Inject a SDL_QUIT event
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    SDL_SendQuit();
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}
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// Pause
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extern "C" void Java_org_libsdl_app_SDLActivity_nativePause(
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                                    JNIEnv* env, jclass cls)
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{
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    if (Android_Window) {
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        SDL_SendWindowEvent(Android_Window, SDL_WINDOWEVENT_HIDDEN, 0, 0);
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        SDL_SendWindowEvent(Android_Window, SDL_WINDOWEVENT_FOCUS_LOST, 0, 0);
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    }
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}
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// Resume
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeResume(
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                                    JNIEnv* env, jclass cls)
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{
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    if (Android_Window) {
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        SDL_SendWindowEvent(Android_Window, SDL_WINDOWEVENT_SHOWN, 0, 0);
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        SDL_SendWindowEvent(Android_Window, SDL_WINDOWEVENT_FOCUS_GAINED, 0, 0);
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    }
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(
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                                    JNIEnv* env, jclass cls)
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{
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    /* This is the audio thread, with a different environment */
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    mAudioEnv = env;
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    Android_RunAudioThread();
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}
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/*******************************************************************************
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             Functions called by SDL into Java
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*******************************************************************************/
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extern "C" SDL_bool Android_JNI_CreateContext(int majorVersion, int minorVersion)
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{
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    if (mEnv->CallStaticBooleanMethod(mActivityClass, midCreateGLContext, majorVersion, minorVersion)) {
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        return SDL_TRUE;
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    } else {
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        return SDL_FALSE;
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    }
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}
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extern "C" void Android_JNI_SwapWindow()
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{
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    mEnv->CallStaticVoidMethod(mActivityClass, midFlipBuffers); 
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}
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extern "C" void Android_JNI_SetActivityTitle(const char *title)
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{
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    jmethodID mid;
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    mid = mEnv->GetStaticMethodID(mActivityClass,"setActivityTitle","(Ljava/lang/String;)V");
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    if (mid) {
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        mEnv->CallStaticVoidMethod(mActivityClass, mid, mEnv->NewStringUTF(title));
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    }
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}
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extern "C" void Android_JNI_GetAccelerometerValues(float values[3])
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{
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    int i;
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    for (i = 0; i < 3; ++i) {
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        values[i] = fLastAccelerometer[i];
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    }
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}
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//
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// Audio support
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//
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static jboolean audioBuffer16Bit = JNI_FALSE;
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static jboolean audioBufferStereo = JNI_FALSE;
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static jobject audioBuffer = NULL;
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static void* audioBufferPinned = NULL;
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extern "C" int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames)
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{
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    int audioBufferFrames;
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    int status;
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    JNIEnv *env;
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    static bool isAttached = false;    
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    status = mJavaVM->GetEnv((void **) &env, JNI_VERSION_1_4);
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    if(status < 0) {
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        LOGE("callback_handler: failed to get JNI environment, assuming native thread");
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        status = mJavaVM->AttachCurrentThread(&env, NULL);
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        if(status < 0) {
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            LOGE("callback_handler: failed to attach current thread");
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            return 0;
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        }
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        isAttached = true;
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    }
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    __android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");
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    audioBuffer16Bit = is16Bit;
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    audioBufferStereo = channelCount > 1;
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    audioBuffer = env->CallStaticObjectMethod(mActivityClass, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);
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    if (audioBuffer == NULL) {
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        __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL audio: didn't get back a good audio buffer!");
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        return 0;
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    }
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    audioBuffer = env->NewGlobalRef(audioBuffer);
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    jboolean isCopy = JNI_FALSE;
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    if (audioBuffer16Bit) {
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        audioBufferPinned = env->GetShortArrayElements((jshortArray)audioBuffer, &isCopy);
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        audioBufferFrames = env->GetArrayLength((jshortArray)audioBuffer);
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    } else {
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        audioBufferPinned = env->GetByteArrayElements((jbyteArray)audioBuffer, &isCopy);
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        audioBufferFrames = env->GetArrayLength((jbyteArray)audioBuffer);
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    }
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    if (audioBufferStereo) {
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        audioBufferFrames /= 2;
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    }
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    if (isAttached) {
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        mJavaVM->DetachCurrentThread();
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    }
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    return audioBufferFrames;
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}
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extern "C" void * Android_JNI_GetAudioBuffer()
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{
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    return audioBufferPinned;
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}
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extern "C" void Android_JNI_WriteAudioBuffer()
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{
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    if (audioBuffer16Bit) {
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        mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);
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        mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteShortBuffer, (jshortArray)audioBuffer);
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    } else {
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        mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);
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        mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);
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    }
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    /* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */
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}
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extern "C" void Android_JNI_CloseAudioDevice()
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{
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    int status;
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    JNIEnv *env;
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    static bool isAttached = false;    
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    status = mJavaVM->GetEnv((void **) &env, JNI_VERSION_1_4);
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    if(status < 0) {
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        LOGE("callback_handler: failed to get JNI environment, assuming native thread");
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        status = mJavaVM->AttachCurrentThread(&env, NULL);
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        if(status < 0) {
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            LOGE("callback_handler: failed to attach current thread");
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            return;
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        }
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        isAttached = true;
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    }
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    env->CallStaticVoidMethod(mActivityClass, midAudioQuit); 
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    if (audioBuffer) {
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        env->DeleteGlobalRef(audioBuffer);
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        audioBuffer = NULL;
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        audioBufferPinned = NULL;
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    }
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    if (isAttached) {
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        mJavaVM->DetachCurrentThread();
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    }
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}
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// Test for an exception and call SDL_SetError with its detail if one occurs
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static bool Android_JNI_ExceptionOccurred()
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{
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    jthrowable exception = mEnv->ExceptionOccurred();
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    if (exception != NULL) {
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        jmethodID mid;
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        // Until this happens most JNI operations have undefined behaviour
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        mEnv->ExceptionClear();
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        jclass exceptionClass = mEnv->GetObjectClass(exception);
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        jclass classClass = mEnv->FindClass("java/lang/Class");
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        mid = mEnv->GetMethodID(classClass, "getName", "()Ljava/lang/String;");
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        jstring exceptionName = (jstring)mEnv->CallObjectMethod(exceptionClass, mid);
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        const char* exceptionNameUTF8 = mEnv->GetStringUTFChars(exceptionName, 0);
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        mid = mEnv->GetMethodID(exceptionClass, "getMessage", "()Ljava/lang/String;");
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        jstring exceptionMessage = (jstring)mEnv->CallObjectMethod(exception, mid);
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        if (exceptionMessage != NULL) {
tim@5650
   361
            const char* exceptionMessageUTF8 = mEnv->GetStringUTFChars(
tim@5650
   362
                    exceptionMessage, 0);
tim@5650
   363
            SDL_SetError("%s: %s", exceptionNameUTF8, exceptionMessageUTF8);
tim@5650
   364
            mEnv->ReleaseStringUTFChars(exceptionMessage, exceptionMessageUTF8);
tim@5650
   365
            mEnv->DeleteLocalRef(exceptionMessage);
tim@5650
   366
        } else {
tim@5650
   367
            SDL_SetError("%s", exceptionNameUTF8);
tim@5650
   368
        }
tim@5650
   369
tim@5650
   370
        mEnv->ReleaseStringUTFChars(exceptionName, exceptionNameUTF8);
tim@5650
   371
        mEnv->DeleteLocalRef(exceptionName);
tim@5650
   372
        mEnv->DeleteLocalRef(classClass);
tim@5650
   373
        mEnv->DeleteLocalRef(exceptionClass);
tim@5650
   374
        mEnv->DeleteLocalRef(exception);
tim@5650
   375
tim@5650
   376
        return true;
tim@5650
   377
    }
tim@5650
   378
tim@5650
   379
    return false;
tim@5650
   380
}
tim@5650
   381
icculus@5582
   382
static int Android_JNI_FileOpen(SDL_RWops* ctx)
icculus@5582
   383
{
tim@5650
   384
    int result = 0;
tim@5650
   385
tim@5650
   386
    jmethodID mid;
tim@5650
   387
    jobject context;
tim@5650
   388
    jobject assetManager;
tim@5650
   389
    jobject inputStream;
tim@5650
   390
    jclass channels;
tim@5650
   391
    jobject readableByteChannel;
tim@5650
   392
    jstring fileNameJString;
tim@5650
   393
tim@5650
   394
    bool allocatedLocalFrame = false;
tim@5650
   395
tim@5650
   396
    if (mEnv->PushLocalFrame(16) < 0) {
tim@5650
   397
        SDL_SetError("Failed to allocate enough JVM local references");
tim@5650
   398
        goto failure;
tim@5650
   399
    } else {
tim@5650
   400
        allocatedLocalFrame = true;
tim@5650
   401
    }
tim@5650
   402
tim@5650
   403
    fileNameJString = (jstring)ctx->hidden.androidio.fileName;
icculus@5582
   404
icculus@5582
   405
    // context = SDLActivity.getContext();
tim@5650
   406
    mid = mEnv->GetStaticMethodID(mActivityClass,
icculus@5582
   407
            "getContext","()Landroid/content/Context;");
tim@5650
   408
    context = mEnv->CallStaticObjectMethod(mActivityClass, mid);
icculus@5582
   409
icculus@5582
   410
    // assetManager = context.getAssets();
icculus@5582
   411
    mid = mEnv->GetMethodID(mEnv->GetObjectClass(context),
tim@5650
   412
            "getAssets", "()Landroid/content/res/AssetManager;");
tim@5650
   413
    assetManager = mEnv->CallObjectMethod(context, mid);
icculus@5582
   414
icculus@5582
   415
    // inputStream = assetManager.open(<filename>);
icculus@5582
   416
    mid = mEnv->GetMethodID(mEnv->GetObjectClass(assetManager),
icculus@5582
   417
            "open", "(Ljava/lang/String;)Ljava/io/InputStream;");
tim@5650
   418
    inputStream = mEnv->CallObjectMethod(assetManager, mid, fileNameJString);
tim@5650
   419
    if (Android_JNI_ExceptionOccurred()) {
tim@5650
   420
        goto failure;
icculus@5582
   421
    }
icculus@5582
   422
tim@5650
   423
    ctx->hidden.androidio.inputStream = inputStream;
tim@5650
   424
    ctx->hidden.androidio.inputStreamRef = mEnv->NewGlobalRef(inputStream);
tim@5650
   425
icculus@5582
   426
    // Despite all the visible documentation on [Asset]InputStream claiming
icculus@5582
   427
    // that the .available() method is not guaranteed to return the entire file
icculus@5582
   428
    // size, comments in <sdk>/samples/<ver>/ApiDemos/src/com/example/ ...
icculus@5582
   429
    // android/apis/content/ReadAsset.java imply that Android's
icculus@5582
   430
    // AssetInputStream.available() /will/ always return the total file size
icculus@5582
   431
icculus@5582
   432
    // size = inputStream.available();
icculus@5582
   433
    mid = mEnv->GetMethodID(mEnv->GetObjectClass(inputStream),
icculus@5582
   434
            "available", "()I");
icculus@5582
   435
    ctx->hidden.androidio.size = mEnv->CallIntMethod(inputStream, mid);
tim@5650
   436
    if (Android_JNI_ExceptionOccurred()) {
tim@5650
   437
        goto failure;
icculus@5582
   438
    }
icculus@5582
   439
icculus@5582
   440
    // readableByteChannel = Channels.newChannel(inputStream);
tim@5650
   441
    channels = mEnv->FindClass("java/nio/channels/Channels");
icculus@5582
   442
    mid = mEnv->GetStaticMethodID(channels,
icculus@5582
   443
            "newChannel",
icculus@5582
   444
            "(Ljava/io/InputStream;)Ljava/nio/channels/ReadableByteChannel;");
tim@5650
   445
    readableByteChannel = mEnv->CallStaticObjectMethod(
icculus@5582
   446
            channels, mid, inputStream);
tim@5650
   447
    if (Android_JNI_ExceptionOccurred()) {
tim@5650
   448
        goto failure;
icculus@5582
   449
    }
icculus@5582
   450
tim@5650
   451
    ctx->hidden.androidio.readableByteChannel = readableByteChannel;
tim@5650
   452
    ctx->hidden.androidio.readableByteChannelRef =
tim@5650
   453
        mEnv->NewGlobalRef(readableByteChannel);
tim@5650
   454
icculus@5582
   455
    // Store .read id for reading purposes
icculus@5582
   456
    mid = mEnv->GetMethodID(mEnv->GetObjectClass(readableByteChannel),
icculus@5582
   457
            "read", "(Ljava/nio/ByteBuffer;)I");
icculus@5582
   458
    ctx->hidden.androidio.readMethod = mid;
icculus@5582
   459
icculus@5582
   460
    ctx->hidden.androidio.position = 0;
icculus@5582
   461
tim@5650
   462
    if (false) {
tim@5650
   463
failure:
tim@5650
   464
        result = -1;
tim@5650
   465
tim@5650
   466
        mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.fileNameRef);
tim@5650
   467
tim@5650
   468
        if(ctx->hidden.androidio.inputStreamRef != NULL) {
tim@5650
   469
            mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.inputStreamRef);
tim@5650
   470
        }
tim@5650
   471
    }
tim@5650
   472
tim@5650
   473
    if (allocatedLocalFrame) {
tim@5650
   474
        mEnv->PopLocalFrame(NULL);
tim@5650
   475
    }
tim@5650
   476
tim@5650
   477
    return result;
icculus@5582
   478
}
icculus@5582
   479
icculus@5582
   480
extern "C" int Android_JNI_FileOpen(SDL_RWops* ctx,
icculus@5582
   481
        const char* fileName, const char*)
icculus@5582
   482
{
icculus@5582
   483
    if (!ctx) {
icculus@5582
   484
        return -1;
icculus@5582
   485
    }
icculus@5582
   486
icculus@5582
   487
    jstring fileNameJString = mEnv->NewStringUTF(fileName);
icculus@5582
   488
    ctx->hidden.androidio.fileName = fileNameJString;
icculus@5582
   489
    ctx->hidden.androidio.fileNameRef = mEnv->NewGlobalRef(fileNameJString);
tim@5650
   490
    ctx->hidden.androidio.inputStreamRef = NULL;
tim@5650
   491
    mEnv->DeleteLocalRef(fileNameJString);
icculus@5582
   492
icculus@5582
   493
    return Android_JNI_FileOpen(ctx);
icculus@5582
   494
}
icculus@5582
   495
icculus@5582
   496
extern "C" size_t Android_JNI_FileRead(SDL_RWops* ctx, void* buffer,
icculus@5582
   497
        size_t size, size_t maxnum)
icculus@5582
   498
{
icculus@5582
   499
    int bytesRemaining = size * maxnum;
icculus@5582
   500
    int bytesRead = 0;
icculus@5582
   501
icculus@5582
   502
    jobject readableByteChannel = (jobject)ctx->hidden.androidio.readableByteChannel;
icculus@5582
   503
    jmethodID readMethod = (jmethodID)ctx->hidden.androidio.readMethod;
icculus@5582
   504
    jobject byteBuffer = mEnv->NewDirectByteBuffer(buffer, bytesRemaining);
icculus@5582
   505
icculus@5582
   506
    while (bytesRemaining > 0) {
icculus@5582
   507
        // result = readableByteChannel.read(...);
icculus@5582
   508
        int result = mEnv->CallIntMethod(readableByteChannel, readMethod, byteBuffer);
icculus@5582
   509
tim@5650
   510
        if (Android_JNI_ExceptionOccurred()) {
tim@5650
   511
            mEnv->DeleteLocalRef(byteBuffer);
icculus@5582
   512
            return 0;
icculus@5582
   513
        }
icculus@5582
   514
icculus@5582
   515
        if (result < 0) {
icculus@5582
   516
            break;
icculus@5582
   517
        }
icculus@5582
   518
icculus@5582
   519
        bytesRemaining -= result;
icculus@5582
   520
        bytesRead += result;
icculus@5582
   521
        ctx->hidden.androidio.position += result;
icculus@5582
   522
    }
icculus@5582
   523
tim@5650
   524
    mEnv->DeleteLocalRef(byteBuffer);
tim@5650
   525
icculus@5582
   526
    return bytesRead / size;
icculus@5582
   527
}
icculus@5582
   528
icculus@5582
   529
extern "C" size_t Android_JNI_FileWrite(SDL_RWops* ctx, const void* buffer,
icculus@5582
   530
        size_t size, size_t num)
icculus@5582
   531
{
icculus@5582
   532
    SDL_SetError("Cannot write to Android package filesystem");
icculus@5582
   533
    return 0;
icculus@5582
   534
}
icculus@5582
   535
icculus@5582
   536
static int Android_JNI_FileClose(SDL_RWops* ctx, bool release)
icculus@5582
   537
{
icculus@5582
   538
    int result = 0;
icculus@5582
   539
icculus@5582
   540
    if (ctx) {
icculus@5582
   541
        if (release) {
icculus@5582
   542
            mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.fileNameRef);
icculus@5582
   543
        }
icculus@5582
   544
icculus@5582
   545
        jobject inputStream = (jobject)ctx->hidden.androidio.inputStream;
icculus@5582
   546
icculus@5582
   547
        // inputStream.close();
icculus@5582
   548
        jmethodID mid = mEnv->GetMethodID(mEnv->GetObjectClass(inputStream),
icculus@5582
   549
                "close", "()V");
icculus@5582
   550
        mEnv->CallVoidMethod(inputStream, mid);
icculus@5582
   551
        mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.inputStreamRef);
icculus@5582
   552
        mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.readableByteChannelRef);
tim@5650
   553
        if (Android_JNI_ExceptionOccurred()) {
icculus@5582
   554
            result = -1;
icculus@5582
   555
        }
icculus@5582
   556
icculus@5582
   557
        if (release) {
icculus@5582
   558
            SDL_FreeRW(ctx);
icculus@5582
   559
        }
icculus@5582
   560
    }
icculus@5582
   561
icculus@5582
   562
    return result;
icculus@5582
   563
}
icculus@5582
   564
icculus@5582
   565
icculus@5582
   566
extern "C" long Android_JNI_FileSeek(SDL_RWops* ctx, long offset, int whence)
icculus@5582
   567
{
icculus@5582
   568
    long newPosition;
icculus@5582
   569
icculus@5582
   570
    switch (whence) {
icculus@5582
   571
        case RW_SEEK_SET:
icculus@5582
   572
            newPosition = offset;
icculus@5582
   573
            break;
icculus@5582
   574
        case RW_SEEK_CUR:
icculus@5582
   575
            newPosition = ctx->hidden.androidio.position + offset;
icculus@5582
   576
            break;
icculus@5582
   577
        case RW_SEEK_END:
icculus@5582
   578
            newPosition = ctx->hidden.androidio.size + offset;
icculus@5582
   579
            break;
icculus@5582
   580
        default:
icculus@5582
   581
            SDL_SetError("Unknown value for 'whence'");
icculus@5582
   582
            return -1;
icculus@5582
   583
    }
icculus@5582
   584
    if (newPosition < 0) {
icculus@5582
   585
        newPosition = 0;
icculus@5582
   586
    }
icculus@5582
   587
    if (newPosition > ctx->hidden.androidio.size) {
icculus@5582
   588
        newPosition = ctx->hidden.androidio.size;
icculus@5582
   589
    }
icculus@5582
   590
icculus@5582
   591
    long movement = newPosition - ctx->hidden.androidio.position;
icculus@5582
   592
    jobject inputStream = (jobject)ctx->hidden.androidio.inputStream;
icculus@5582
   593
icculus@5582
   594
    if (movement > 0) {
tim@5993
   595
        unsigned char buffer[1024];
tim@5993
   596
icculus@5582
   597
        // The easy case where we're seeking forwards
icculus@5582
   598
        while (movement > 0) {
icculus@5994
   599
            long amount = (long) sizeof (buffer);
icculus@5994
   600
            if (amount > movement) {
icculus@5994
   601
                amount = movement;
icculus@5994
   602
            }
icculus@5994
   603
            size_t result = Android_JNI_FileRead(ctx, buffer, 1, amount);
tim@5993
   604
tim@5993
   605
            if (result <= 0) {
tim@5993
   606
                // Failed to read/skip the required amount, so fail
icculus@5582
   607
                return -1;
icculus@5582
   608
            }
tim@5993
   609
tim@5993
   610
            movement -= result;
icculus@5582
   611
        }
icculus@5582
   612
    } else if (movement < 0) {
icculus@5582
   613
        // We can't seek backwards so we have to reopen the file and seek
icculus@5582
   614
        // forwards which obviously isn't very efficient
icculus@5582
   615
        Android_JNI_FileClose(ctx, false);
icculus@5582
   616
        Android_JNI_FileOpen(ctx);
icculus@5582
   617
        Android_JNI_FileSeek(ctx, newPosition, RW_SEEK_SET);
icculus@5582
   618
    }
icculus@5582
   619
icculus@5582
   620
    ctx->hidden.androidio.position = newPosition;
icculus@5582
   621
icculus@5582
   622
    return ctx->hidden.androidio.position;
icculus@5582
   623
}
icculus@5582
   624
icculus@5582
   625
extern "C" int Android_JNI_FileClose(SDL_RWops* ctx)
icculus@5582
   626
{
icculus@5582
   627
    return Android_JNI_FileClose(ctx, true);
icculus@5582
   628
}
icculus@5582
   629
slouken@6044
   630
#endif /* __ANDROID__ */
slouken@6044
   631
slouken@4981
   632
/* vi: set ts=4 sw=4 expandtab: */