2014-09-06 16:25:09 -07:00

102 lines
2.8 KiB
Java

package com.limelight.binding.input.evdev;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import com.limelight.LimeLog;
public class EvdevReader {
static {
System.loadLibrary("evdev_reader");
}
// Requires root to chmod /dev/input/eventX
public static boolean setPermissions(String[] files, int octalPermissions) {
ProcessBuilder builder = new ProcessBuilder("su");
try {
Process p = builder.start();
OutputStream stdin = p.getOutputStream();
for (String file : files) {
stdin.write(String.format("chmod %o %s\n", octalPermissions, file).getBytes("UTF-8"));
}
stdin.write("exit\n".getBytes("UTF-8"));
stdin.flush();
p.waitFor();
p.destroy();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
return false;
}
// Returns the fd to be passed to other function or -1 on error
public static native int open(String fileName);
// Prevent other apps (including Android itself) from using the device while "grabbed"
public static native boolean grab(int fd);
public static native boolean ungrab(int fd);
// Used for checking device capabilities
public static native boolean hasRelAxis(int fd, short axis);
public static native boolean hasAbsAxis(int fd, short axis);
public static native boolean hasKey(int fd, short key);
public static boolean isMouse(int fd) {
// This is the same check that Android does in EventHub.cpp
return hasRelAxis(fd, EvdevEvent.REL_X) &&
hasRelAxis(fd, EvdevEvent.REL_Y) &&
hasKey(fd, EvdevEvent.BTN_LEFT);
}
public static boolean isAlphaKeyboard(int fd) {
// This is the same check that Android does in EventHub.cpp
return hasKey(fd, EvdevEvent.KEY_Q);
}
public static boolean isGamepad(int fd) {
return hasKey(fd, EvdevEvent.BTN_GAMEPAD);
}
// Returns the bytes read or -1 on error
private static native int read(int fd, byte[] buffer);
// Takes a byte buffer to use to read the output into.
// This buffer MUST be in native byte order and at least
// EVDEV_MAX_EVENT_SIZE bytes long.
public static EvdevEvent read(int fd, ByteBuffer buffer) {
int bytesRead = read(fd, buffer.array());
if (bytesRead < 0) {
LimeLog.warning("Failed to read: "+bytesRead);
return null;
}
else if (bytesRead < EvdevEvent.EVDEV_MIN_EVENT_SIZE) {
LimeLog.warning("Short read: "+bytesRead);
return null;
}
buffer.limit(bytesRead);
buffer.rewind();
// Throw away the time stamp
if (bytesRead == EvdevEvent.EVDEV_MAX_EVENT_SIZE) {
buffer.getLong();
buffer.getLong();
} else {
buffer.getInt();
buffer.getInt();
}
return new EvdevEvent(buffer.getShort(), buffer.getShort(), buffer.getInt());
}
// Closes the fd from open()
public static native int close(int fd);
}