static int Android_JNI_FileClose(SDL_RWops* ctx, bool release)
{
LocalReferenceHolder refs;
int result = 0;
if (!refs.init(mEnv)) {
SDL_SetError("Failed to allocate enough JVM local references");
return -1;
}
if (ctx) {
if (release) {
mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.fileNameRef);
}
jobject inputStream = (jobject)ctx->hidden.androidio.inputStreamRef;
// inputStream.close();
jmethodID mid = mEnv->GetMethodID(mEnv->GetObjectClass(inputStream),
"close", "()V");
mEnv->CallVoidMethod(inputStream, mid);
mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.inputStreamRef);
mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.readableByteChannelRef);
if (Android_JNI_ExceptionOccurred()) {
result = -1;
}
if (release) {
SDL_FreeRW(ctx);
}
}
return result;
}
extern "C" size_t Android_JNI_FileRead(SDL_RWops* ctx, void* buffer,
size_t size, size_t maxnum)
{
LocalReferenceHolder refs;
int bytesRemaining = size * maxnum;
int bytesRead = 0;
if (!refs.init(mEnv)) {
return -1;
}
jobject readableByteChannel = (jobject)ctx->hidden.androidio.readableByteChannelRef;
jmethodID readMethod = (jmethodID)ctx->hidden.androidio.readMethod;
jobject byteBuffer = mEnv->NewDirectByteBuffer(buffer, bytesRemaining);
while (bytesRemaining > 0) {
// result = readableByteChannel.read(...);
int result = mEnv->CallIntMethod(readableByteChannel, readMethod, byteBuffer);
if (Android_JNI_ExceptionOccurred()) {
return 0;
}
if (result < 0) {
break;
}
bytesRemaining -= result;
bytesRead += result;
ctx->hidden.androidio.position += result;
}
return bytesRead / size;
}
extern "C" int Android_JNI_FileOpen(SDL_RWops* ctx,
const char* fileName, const char*)
{
LocalReferenceHolder refs;
if (!refs.init(mEnv)) {
return -1;
}
if (!ctx) {
return -1;
}
jstring fileNameJString = mEnv->NewStringUTF(fileName);
ctx->hidden.androidio.fileNameRef = mEnv->NewGlobalRef(fileNameJString);
ctx->hidden.androidio.inputStreamRef = NULL;
return Android_JNI_FileOpen(ctx);
}
extern "C" size_t Android_JNI_FileRead(SDL_RWops* ctx, void* buffer,
size_t size, size_t maxnum)
{
LocalReferenceHolder refs;
jlong bytesRemaining = (jlong) (size * maxnum);
jlong bytesMax = (jlong) (ctx->hidden.androidio.size - ctx->hidden.androidio.position);
int bytesRead = 0;
/* Don't read more bytes than those that remain in the file, otherwise we get an exception */
if (bytesRemaining > bytesMax) bytesRemaining = bytesMax;
JNIEnv *mEnv = Android_JNI_GetEnv();
if (!refs.init(mEnv)) {
return -1;
}
jobject readableByteChannel = (jobject)ctx->hidden.androidio.readableByteChannelRef;
jmethodID readMethod = (jmethodID)ctx->hidden.androidio.readMethod;
jobject byteBuffer = mEnv->NewDirectByteBuffer(buffer, bytesRemaining);
while (bytesRemaining > 0) {
// result = readableByteChannel.read(...);
int result = mEnv->CallIntMethod(readableByteChannel, readMethod, byteBuffer);
if (Android_JNI_ExceptionOccurred()) {
return 0;
}
if (result < 0) {
break;
}
bytesRemaining -= result;
bytesRead += result;
ctx->hidden.androidio.position += result;
}
return bytesRead / size;
}
static int Android_JNI_FileOpen(SDL_RWops* ctx)
{
LocalReferenceHolder refs;
int result = 0;
jmethodID mid;
jobject context;
jobject assetManager;
jobject inputStream;
jclass channels;
jobject readableByteChannel;
jstring fileNameJString;
if (!refs.init(mEnv)) {
goto failure;
}
fileNameJString = (jstring)ctx->hidden.androidio.fileNameRef;
// context = SDLActivity.getContext();
mid = mEnv->GetStaticMethodID(mActivityClass,
"getContext","()Landroid/content/Context;");
context = mEnv->CallStaticObjectMethod(mActivityClass, mid);
// assetManager = context.getAssets();
mid = mEnv->GetMethodID(mEnv->GetObjectClass(context),
"getAssets", "()Landroid/content/res/AssetManager;");
assetManager = mEnv->CallObjectMethod(context, mid);
// inputStream = assetManager.open(<filename>);
mid = mEnv->GetMethodID(mEnv->GetObjectClass(assetManager),
"open", "(Ljava/lang/String;)Ljava/io/InputStream;");
inputStream = mEnv->CallObjectMethod(assetManager, mid, fileNameJString);
if (Android_JNI_ExceptionOccurred()) {
goto failure;
}
ctx->hidden.androidio.inputStreamRef = mEnv->NewGlobalRef(inputStream);
// Despite all the visible documentation on [Asset]InputStream claiming
// that the .available() method is not guaranteed to return the entire file
// size, comments in <sdk>/samples/<ver>/ApiDemos/src/com/example/ ...
// android/apis/content/ReadAsset.java imply that Android's
// AssetInputStream.available() /will/ always return the total file size
// size = inputStream.available();
mid = mEnv->GetMethodID(mEnv->GetObjectClass(inputStream),
"available", "()I");
ctx->hidden.androidio.size = mEnv->CallIntMethod(inputStream, mid);
if (Android_JNI_ExceptionOccurred()) {
goto failure;
}
// readableByteChannel = Channels.newChannel(inputStream);
channels = mEnv->FindClass("java/nio/channels/Channels");
mid = mEnv->GetStaticMethodID(channels,
"newChannel",
"(Ljava/io/InputStream;)Ljava/nio/channels/ReadableByteChannel;");
readableByteChannel = mEnv->CallStaticObjectMethod(
channels, mid, inputStream);
if (Android_JNI_ExceptionOccurred()) {
goto failure;
}
ctx->hidden.androidio.readableByteChannelRef =
mEnv->NewGlobalRef(readableByteChannel);
// Store .read id for reading purposes
mid = mEnv->GetMethodID(mEnv->GetObjectClass(readableByteChannel),
"read", "(Ljava/nio/ByteBuffer;)I");
ctx->hidden.androidio.readMethod = mid;
ctx->hidden.androidio.position = 0;
if (false) {
failure:
result = -1;
mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.fileNameRef);
if(ctx->hidden.androidio.inputStreamRef != NULL) {
mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.inputStreamRef);
}
if(ctx->hidden.androidio.readableByteChannelRef != NULL) {
mEnv->DeleteGlobalRef((jobject)ctx->hidden.androidio.readableByteChannelRef);
}
}
return result;
}