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net_java_games_input_LinuxJoystickDevice.c

/*
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 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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* Copyright (c) 2003 Sun Microsystems, Inc.  All Rights Reserved.
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/joystick.h>
#include "util.h"
#include "net_java_games_input_LinuxJoystickDevice.h"

JNIEXPORT jlong JNICALL Java_net_java_games_input_LinuxJoystickDevice_nOpen(JNIEnv *env, jclass unused, jstring path) {
      const char *path_str = (*env)->GetStringUTFChars(env, path, NULL);
      if (path_str == NULL)
            return -1;
      int fd = open(path_str, O_RDONLY | O_NONBLOCK);
      if (fd == -1)
            throwIOException(env, "Failed to open device %s (%d)\n", path_str, errno);
      (*env)->ReleaseStringUTFChars(env, path, path_str);
      return fd;
}

JNIEXPORT void JNICALL Java_net_java_games_input_LinuxJoystickDevice_nClose(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      int result = close(fd);
      if (result == -1)
            throwIOException(env, "Failed to close device (%d)\n", errno);
}

JNIEXPORT jstring JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetName(JNIEnv *env, jclass unused, jlong fd_address) {
#define BUFFER_SIZE 1024
      int fd = (int)fd_address;
      char device_name[BUFFER_SIZE];
      
      if (ioctl(fd, JSIOCGNAME(BUFFER_SIZE), device_name) == -1) {
            throwIOException(env, "Failed to get device name (%d)\n", errno);
            return NULL;
      }
      jstring jstr = (*env)->NewStringUTF(env, device_name);
      return jstr;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetVersion(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      __u32 version;
      if (ioctl(fd, JSIOCGVERSION, &version) == -1) {
            throwIOException(env, "Failed to get device version (%d)\n", errno);
            return -1;
      }
      return version;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetNumButtons(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      __u8 num_buttons;
      if (ioctl(fd, JSIOCGBUTTONS, &num_buttons) == -1) {
            throwIOException(env, "Failed to get number of buttons (%d)\n", errno);
            return -1;
      }
      return num_buttons;
}

JNIEXPORT jint JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetNumAxes(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      __u8 num_axes;
      if (ioctl(fd, JSIOCGAXES, &num_axes) == -1) {
            throwIOException(env, "Failed to get number of buttons (%d)\n", errno);
            return -1;
      }
      return num_axes;
}

JNIEXPORT jbyteArray JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetAxisMap(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      __u8 axis_map[ABS_MAX + 1];
      if (ioctl(fd, JSIOCGAXMAP, axis_map) == -1) {
            throwIOException(env, "Failed to get axis map (%d)\n", errno);
            return NULL;
      }
      
      jbyteArray axis_map_array = (*env)->NewByteArray(env, (ABS_MAX + 1));
      if (axis_map_array == NULL)
            return NULL;
      (*env)->SetByteArrayRegion(env, axis_map_array, 0, (ABS_MAX + 1), (jbyte *)axis_map);
      return axis_map_array;
}

JNIEXPORT jcharArray JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetButtonMap(JNIEnv *env, jclass unused, jlong fd_address) {
      int fd = (int)fd_address;
      __u16 button_map[KEY_MAX - BTN_MISC + 1];
      if (ioctl(fd, JSIOCGBTNMAP, button_map) == -1) {
            throwIOException(env, "Failed to get button map (%d)\n", errno);
            return NULL;
      }
      
      jcharArray button_map_array = (*env)->NewCharArray(env, (KEY_MAX - BTN_MISC + 1));
      if (button_map_array == NULL)
            return NULL;
      (*env)->SetCharArrayRegion(env, button_map_array, 0, (KEY_MAX - BTN_MISC + 1), (jchar *)button_map);
      return button_map_array;
}

JNIEXPORT jboolean JNICALL Java_net_java_games_input_LinuxJoystickDevice_nGetNextEvent(JNIEnv *env, jclass unused, jlong fd_address, jobject event_return) {
      int fd = (int)fd_address;
      jclass event_class = (*env)->GetObjectClass(env, event_return);
      if (event_class == NULL)
            return JNI_FALSE;
      jmethodID event_set = (*env)->GetMethodID(env, event_class, "set", "(JIII)V");
      if (event_set == NULL)
            return JNI_FALSE;
      struct js_event event;
      if (read(fd, &event, sizeof(event)) == -1) {
            if (errno == EAGAIN)
                  return JNI_FALSE;
            throwIOException(env, "Failed to read next device event (%d)\n", errno);
            return JNI_FALSE;
      }
      (*env)->CallVoidMethod(env, event_return, event_set, (jlong)event.time, (jint)event.value, (jint)event.type, (jint)event.number);
      return JNI_TRUE;
}

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