libjava/classpath/native/jni/gstreamer-peer/gst_input_stream.c - rust-lang/gcc - Git at Google

 /*GstInputStream.c - Header file for the GstClasspathPlugin
  Copyright (C) 2007 Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2, or (at your option)
 any later version.

 GNU Classpath is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GNU Classpath; see the file COPYING.  If not, write to the
 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 02110-1301 USA.

 Linking this library statically or dynamically with other modules is
 making a combined work based on this library.  Thus, the terms and
 conditions of the GNU General Public License cover the whole
 combination.

 As a special exception, the copyright holders of this library give you
 permission to link this library with independent modules to produce an
 executable, regardless of the license terms of these independent
 modules, and to copy and distribute the resulting executable under
 terms of your choice, provided that you also meet, for each linked
 independent module, the terms and conditions of the license of that
 module.  An independent module is a module which is not derived from
 or based on this library.  If you modify this library, you may extend
 this exception to your version of the library, but you are not
 obligated to do so.  If you do not wish to do so, delete this
 exception statement from your version. */

 #include <jni.h>
 #include <jcl.h>

 #include <string.h>
 #include <stdlib.h>

 #include <gdk/gdk.h>

 #include <glib.h>

 #include "gst_peer.h"

 #include "gnu_javax_sound_sampled_gstreamer_io_GstInputStream.h"
 #include "gst_input_stream.h"

 /* for caching */
 static jmethodID readID = NULL;
 static jmethodID pointerConstructorID = NULL;
 static jmethodID availableID = NULL;

 static jfieldID streamID = NULL;
 static jfieldID pointerDataID = NULL;

 struct _GstInputStreamPrivate
 {
   JavaVM *vm;
   jclass readerClass;
   jclass pointerClass;

   jobject reader;
 };

 /* ************************************************************************** */

 static void init_pointer_IDs (JNIEnv* env);

 /* ************************************************************************** */

 /* JNI Methods */

 JNIEXPORT void JNICALL
 Java_gnu_javax_sound_sampled_gstreamer_io_GstInputStream_init_1id_1cache
   (JNIEnv *env, jclass clazz)
 {
   readID = (*env)->GetMethodID(env, clazz, "read", "([BII)I");
   availableID = (*env)->GetMethodID(env, clazz, "available", "()I");

   streamID = (*env)->GetFieldID(env, clazz, "gstInputStream",
                                 "Lgnu/classpath/Pointer;");
   init_pointer_IDs(env);
 }

 JNIEXPORT void JNICALL
 Java_gnu_javax_sound_sampled_gstreamer_io_GstInputStream_init_1instance
   (JNIEnv *env, jobject reader)
 {
   GstInputStream *istream = NULL;

   jclass localReader = NULL;
   jclass localPointer = NULL;
   jobject _pointer = NULL;

   istream = (GstInputStream *) JCL_malloc (env, sizeof (GstInputStream));
   if (istream == NULL)
     return;

   istream->priv = (GstInputStreamPrivate *)
       JCL_malloc (env, sizeof (GstInputStreamPrivate));
   if (istream->priv == NULL)
     {
       JCL_free (env, istream);
       return;
     }

   /* get a local references first */
   localReader = (*env)->GetObjectClass(env, reader);
   if (localReader == NULL)
     {
       JCL_free (env, istream->priv);
       JCL_free (env, istream);
       JCL_ThrowException (env, "java/lang/InternalError",
                                "Class Initialization failed.");

       return;
     }

 #if SIZEOF_VOID_P == 8
   localPointer = JCL_FindClass (env, "gnu/classpath/Pointer64");
 #else
 # if SIZEOF_VOID_P == 4
   localPointer = JCL_FindClass (env, "gnu/classpath/Pointer32");
 # else
 #   error "Pointer size is not supported."
 # endif /* SIZEOF_VOID_P == 4 */
 #endif /* SIZEOF_VOID_P == 8 */

   if (localReader == NULL || localPointer == NULL)
     {
       JCL_free (env, istream->priv);
       JCL_free (env, istream);
       JCL_ThrowException (env, "java/lang/InternalError",
                                "Class Initialization failed.");
       return;
     }

   /* fill out our structure */
   istream->priv->readerClass = (*env)->NewGlobalRef(env, localReader);
   istream->priv->pointerClass = (*env)->NewGlobalRef(env, localPointer);
   (*env)->GetJavaVM(env, &istream->priv->vm);
   istream->priv->reader = (*env)->NewGlobalRef(env, reader);

   _pointer = (*env)->GetObjectField(env, reader, streamID);

    /* this should be always null */
   if (_pointer == NULL)
     {
 #if SIZEOF_VOID_P == 8
       _pointer = (*env)->NewObject(env, istream->priv->pointerClass,
                                    pointerConstructorID, (jlong) istream);
 #else
       _pointer = (*env)->NewObject(env, istream->priv->pointerClass,
                                    pointerConstructorID, (jint) istream);
 #endif
     }
   else
     {
 #if SIZEOF_VOID_P == 8
       (*env)->SetLongField(env, reader, streamID, (jlong) istream);
 #else
       (*env)->SetIntField(env, reader, streamID, (jint) istream);
 #endif
     }

     /* store back our pointer into the calling class */
     (*env)->SetObjectField(env, reader, streamID, _pointer);
 }

 /* exported library functions */

 void
 gst_input_stream_clean (GstInputStream *self)
 {
   JNIEnv *env = NULL;

   env = gst_get_jenv (self->priv->vm);

   (*env)->DeleteGlobalRef (env, self->priv->reader);
   (*env)->DeleteGlobalRef (env, self->priv->readerClass);
   (*env)->DeleteGlobalRef (env, self->priv->pointerClass);

   JCL_free (env, self->priv);
   JCL_free (env, self);
 }

 int
 gst_input_stream_available (GstInputStream *self)
 {
   JNIEnv *env = NULL;

   if (self == NULL || self->priv == NULL ||
       self->priv->vm == NULL || self->priv->reader == NULL)
     {
       return -1;
     }

   env = gst_get_jenv (self->priv->vm);
   if (env == NULL)
     {
       g_warning("GstInputStream::gst_input_stream_available " \
                 "failed to get java env");
       return -1;
     }

   return (*env)->CallIntMethod (env, self->priv->reader, availableID);
 }

 int
 gst_input_stream_read (GstInputStream *self, int *data, int offset,
                        int length)
 {
   JNIEnv *env = NULL;

   int ret = -1;
   jbyteArray buffer;
   jbyte *bytes = NULL;

   if (self == NULL || self->priv == NULL ||
       self->priv->vm == NULL || self->priv->reader == NULL)
     {
       return -1;
     }

   env = gst_get_jenv (self->priv->vm);
   if (env == NULL)
     {
       g_warning("GstInputStream::gst_input_stream_read failed to get java env");
       return -1;
     }

   buffer = (*env)->NewByteArray (env, length);
   if (buffer == NULL)
     {
       g_warning ("GstInputStream::gst_input_stream_read called, failed");
       return -1;
     }

   ret = (*env)->CallIntMethod (env, self->priv->reader, readID, buffer, 0,
                                length);
   if (ret < 0)
     {
       (*env)->DeleteLocalRef(env, buffer);
       return ret;
     }

   bytes = (*env)->GetByteArrayElements (env, buffer, NULL);

   /* copy bytes and release */
   memcpy (data + offset, bytes, ret);

   (*env)->ReleaseByteArrayElements (env, buffer, bytes, 0);
   (*env)->DeleteLocalRef (env, buffer);

   return ret;
 }

 /* private functions */

 static void init_pointer_IDs (JNIEnv* env)
 {
   jclass pointerClass = NULL;

 #if SIZEOF_VOID_P == 8
   pointerClass = JCL_FindClass (env, "gnu/classpath/Pointer64");
   if (pointerClass != NULL)
     {
       pointerDataID = (*env)->GetFieldID (env, pointerClass, "data", "J");
       pointerConstructorID = (*env)->GetMethodID (env, pointerClass, "<init>",
                                                   "(J)V");
     }
 #else
 # if SIZEOF_VOID_P == 4
   pointerClass = JCL_FindClass (env, "gnu/classpath/Pointer32");
   if (pointerClass != NULL)
     {
       pointerDataID = (*env)->GetFieldID(env, pointerClass, "data", "I");
       pointerConstructorID = (*env)->GetMethodID(env, pointerClass,
                                                  "<init>", "(I)V");
     }
 # else
 #   error "Pointer size is not supported."
 # endif /* SIZEOF_VOID_P == 4 */
 #endif /* SIZEOF_VOID_P == 8 */
 }
	/*GstInputStream.c - Header file for the GstClasspathPlugin
	Copyright (C) 2007 Free Software Foundation, Inc.

	This file is part of GNU Classpath.

	GNU Classpath is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	GNU Classpath is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with GNU Classpath; see the file COPYING. If not, write to the
	Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301 USA.

	Linking this library statically or dynamically with other modules is
	making a combined work based on this library. Thus, the terms and
	conditions of the GNU General Public License cover the whole
	combination.

	As a special exception, the copyright holders of this library give you
	permission to link this library with independent modules to produce an
	executable, regardless of the license terms of these independent
	modules, and to copy and distribute the resulting executable under
	terms of your choice, provided that you also meet, for each linked
	independent module, the terms and conditions of the license of that
	module. An independent module is a module which is not derived from
	or based on this library. If you modify this library, you may extend
	this exception to your version of the library, but you are not
	obligated to do so. If you do not wish to do so, delete this
	exception statement from your version. */

	#include <jni.h>
	#include <jcl.h>

	#include <string.h>
	#include <stdlib.h>

	#include <gdk/gdk.h>

	#include <glib.h>

	#include "gst_peer.h"

	#include "gnu_javax_sound_sampled_gstreamer_io_GstInputStream.h"
	#include "gst_input_stream.h"

	/* for caching */
	static jmethodID readID = NULL;
	static jmethodID pointerConstructorID = NULL;
	static jmethodID availableID = NULL;

	static jfieldID streamID = NULL;
	static jfieldID pointerDataID = NULL;

	struct _GstInputStreamPrivate
	{
	JavaVM *vm;
	jclass readerClass;
	jclass pointerClass;

	jobject reader;
	};

	/* ************************************************************************** */

	static void init_pointer_IDs (JNIEnv* env);

	/* ************************************************************************** */

	/* JNI Methods */

	JNIEXPORT void JNICALL
	Java_gnu_javax_sound_sampled_gstreamer_io_GstInputStream_init_1id_1cache
	(JNIEnv *env, jclass clazz)
	{
	readID = (*env)->GetMethodID(env, clazz, "read", "([BII)I");
	availableID = (*env)->GetMethodID(env, clazz, "available", "()I");

	streamID = (*env)->GetFieldID(env, clazz, "gstInputStream",
	"Lgnu/classpath/Pointer;");
	init_pointer_IDs(env);
	}

	JNIEXPORT void JNICALL
	Java_gnu_javax_sound_sampled_gstreamer_io_GstInputStream_init_1instance
	(JNIEnv *env, jobject reader)
	{
	GstInputStream *istream = NULL;

	jclass localReader = NULL;
	jclass localPointer = NULL;
	jobject _pointer = NULL;

	istream = (GstInputStream *) JCL_malloc (env, sizeof (GstInputStream));
	if (istream == NULL)
	return;

	istream->priv = (GstInputStreamPrivate *)
	JCL_malloc (env, sizeof (GstInputStreamPrivate));
	if (istream->priv == NULL)
	{
	JCL_free (env, istream);
	return;
	}

	/* get a local references first */
	localReader = (*env)->GetObjectClass(env, reader);
	if (localReader == NULL)
	{
	JCL_free (env, istream->priv);
	JCL_free (env, istream);
	JCL_ThrowException (env, "java/lang/InternalError",
	"Class Initialization failed.");

	return;
	}

	#if SIZEOF_VOID_P == 8
	localPointer = JCL_FindClass (env, "gnu/classpath/Pointer64");
	#else
	# if SIZEOF_VOID_P == 4
	localPointer = JCL_FindClass (env, "gnu/classpath/Pointer32");
	# else
	# error "Pointer size is not supported."
	# endif /* SIZEOF_VOID_P == 4 */
	#endif /* SIZEOF_VOID_P == 8 */

	if (localReader == NULL \|\| localPointer == NULL)
	{
	JCL_free (env, istream->priv);
	JCL_free (env, istream);
	JCL_ThrowException (env, "java/lang/InternalError",
	"Class Initialization failed.");
	return;
	}

	/* fill out our structure */
	istream->priv->readerClass = (*env)->NewGlobalRef(env, localReader);
	istream->priv->pointerClass = (*env)->NewGlobalRef(env, localPointer);
	(*env)->GetJavaVM(env, &istream->priv->vm);
	istream->priv->reader = (*env)->NewGlobalRef(env, reader);

	_pointer = (*env)->GetObjectField(env, reader, streamID);

	/* this should be always null */
	if (_pointer == NULL)
	{
	#if SIZEOF_VOID_P == 8
	_pointer = (*env)->NewObject(env, istream->priv->pointerClass,
	pointerConstructorID, (jlong) istream);
	#else
	_pointer = (*env)->NewObject(env, istream->priv->pointerClass,
	pointerConstructorID, (jint) istream);
	#endif
	}
	else
	{
	#if SIZEOF_VOID_P == 8
	(*env)->SetLongField(env, reader, streamID, (jlong) istream);
	#else
	(*env)->SetIntField(env, reader, streamID, (jint) istream);
	#endif
	}

	/* store back our pointer into the calling class */
	(*env)->SetObjectField(env, reader, streamID, _pointer);
	}

	/* exported library functions */

	void
	gst_input_stream_clean (GstInputStream *self)
	{
	JNIEnv *env = NULL;

	env = gst_get_jenv (self->priv->vm);

	(*env)->DeleteGlobalRef (env, self->priv->reader);
	(*env)->DeleteGlobalRef (env, self->priv->readerClass);
	(*env)->DeleteGlobalRef (env, self->priv->pointerClass);

	JCL_free (env, self->priv);
	JCL_free (env, self);
	}

	int
	gst_input_stream_available (GstInputStream *self)
	{
	JNIEnv *env = NULL;

	if (self == NULL \|\| self->priv == NULL \|\|
	self->priv->vm == NULL \|\| self->priv->reader == NULL)
	{
	return -1;
	}

	env = gst_get_jenv (self->priv->vm);
	if (env == NULL)
	{
	g_warning("GstInputStream::gst_input_stream_available " \
	"failed to get java env");
	return -1;
	}

	return (*env)->CallIntMethod (env, self->priv->reader, availableID);
	}

	int
	gst_input_stream_read (GstInputStream self, int data, int offset,
	int length)
	{
	JNIEnv *env = NULL;

	int ret = -1;
	jbyteArray buffer;
	jbyte *bytes = NULL;

	if (self == NULL \|\| self->priv == NULL \|\|
	self->priv->vm == NULL \|\| self->priv->reader == NULL)
	{
	return -1;
	}

	env = gst_get_jenv (self->priv->vm);
	if (env == NULL)
	{
	g_warning("GstInputStream::gst_input_stream_read failed to get java env");
	return -1;
	}

	buffer = (*env)->NewByteArray (env, length);
	if (buffer == NULL)
	{
	g_warning ("GstInputStream::gst_input_stream_read called, failed");
	return -1;
	}

	ret = (*env)->CallIntMethod (env, self->priv->reader, readID, buffer, 0,
	length);
	if (ret < 0)
	{
	(*env)->DeleteLocalRef(env, buffer);
	return ret;
	}

	bytes = (*env)->GetByteArrayElements (env, buffer, NULL);

	/* copy bytes and release */
	memcpy (data + offset, bytes, ret);

	(*env)->ReleaseByteArrayElements (env, buffer, bytes, 0);
	(*env)->DeleteLocalRef (env, buffer);

	return ret;
	}

	/* private functions */

	static void init_pointer_IDs (JNIEnv* env)
	{
	jclass pointerClass = NULL;

	#if SIZEOF_VOID_P == 8
	pointerClass = JCL_FindClass (env, "gnu/classpath/Pointer64");
	if (pointerClass != NULL)
	{
	pointerDataID = (*env)->GetFieldID (env, pointerClass, "data", "J");
	pointerConstructorID = (*env)->GetMethodID (env, pointerClass, "<init>",
	"(J)V");
	}
	#else
	# if SIZEOF_VOID_P == 4
	pointerClass = JCL_FindClass (env, "gnu/classpath/Pointer32");
	if (pointerClass != NULL)
	{
	pointerDataID = (*env)->GetFieldID(env, pointerClass, "data", "I");
	pointerConstructorID = (*env)->GetMethodID(env, pointerClass,
	"<init>", "(I)V");
	}
	# else
	# error "Pointer size is not supported."
	# endif /* SIZEOF_VOID_P == 4 */
	#endif /* SIZEOF_VOID_P == 8 */
	}