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Serial port APIs of SerialPundit
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/*
* This file is part of SerialPundit.
*
* Copyright (C) 2014-2016, Rishi Gupta. All rights reserved.
*
* The SerialPundit is DUAL LICENSED. It is made available under the terms of the GNU Affero
* General Public License (AGPL) v3.0 for non-commercial use and under the terms of a commercial
* license for commercial use of this software.
*
* The SerialPundit 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.
*/
package com.serialpundit.serial.internal;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import com.serialpundit.core.SerialComException;
import com.serialpundit.core.SerialComPlatform;
import com.serialpundit.core.SerialComSystemProperty;
/**
* This class is an interface between java and native shared library. The native library is found
* in the root of 'sp-tty.jar' file. Silicon labs provide only windows dll.
*
* @author Rishi Gupta
*/
public final class SerialComCP210xRuntimeJNIBridge {
/**
* Allocates a new SerialComCP210xRuntimeJNIBridge object.
*/
public SerialComCP210xRuntimeJNIBridge() {
}
/**
* Extract native library from jar in a working directory, load and link it. The root of sp-tty.jar file
* is searched for the required native library for vendor specific communication. It also load vendor's
* native shared library.
*
* @param libDirectory directory in which native library will be extracted and vendor library will be found.
* @param vlibName name of vendor library to load and link.
* @param cpuArch architecture of CPU this library is running on.
* @param osType operating system this library is running on.
* @param serialComSystemProperty instance of SerialComSystemProperty to get required java properties.
* @return true on success.
* @throws SerialComException if java system properties can not be accessed or required files can not be
* accessed, if shared library is not found, it can not be loaded, linked and initialized etc.
*/
public static boolean loadNativeLibrary(File libDirectory, String vlibName, int cpuArch, int osType,
SerialComSystemProperty serialComSystemProperty) throws SerialComException {
String libToExtractFromJar = null;
File libFile = null;
InputStream input = null;
FileOutputStream output = null;
String fileSeparator = null;
fileSeparator = serialComSystemProperty.getfileSeparator();
if((fileSeparator == null) || (fileSeparator.length() == 0)) {
throw new SerialComException("The file.separator java system property is either null or empty !");
}
/* Find the native library that will be extracted based on arch and os type */
if(cpuArch == SerialComPlatform.ARCH_AMD64) {
switch(osType) {
case SerialComPlatform.OS_WINDOWS:
libToExtractFromJar = "spcp210xrwinx64.dll";
break;
case SerialComPlatform.OS_LINUX:
libToExtractFromJar = "spcp210xrlnxx64.so";
break;
case SerialComPlatform.OS_MAC_OS_X:
libToExtractFromJar = "spcp210xrmacx64.dylib";
break;
default :
}
}
else if(cpuArch == SerialComPlatform.ARCH_X86) {
switch(osType) {
case SerialComPlatform.OS_WINDOWS:
libToExtractFromJar = "spcp210xrwinx86.dll";
break;
case SerialComPlatform.OS_LINUX:
libToExtractFromJar = "spcp210xrlnxx86.so";
break;
case SerialComPlatform.OS_MAC_OS_X:
libToExtractFromJar = "spcp210xrmacx86.dylib";
break;
default :
}
}
else {
throw new SerialComException("This architecture is unknown to this library. Please contact us !");
}
/* Extract shared library from jar into working directory */
try {
libFile = new File(libDirectory.getAbsolutePath() + fileSeparator + libToExtractFromJar);
input = SerialComPortJNIBridge.class.getResourceAsStream("/" + libToExtractFromJar);
output = new FileOutputStream(libFile);
if(input != null) {
int read;
byte[] buffer = new byte[4096];
while((read = input.read(buffer)) != -1){
output.write(buffer, 0, read);
}
output.flush();
output.close();
output = null;
if(!((libFile != null) && libFile.exists() && libFile.isFile())) {
throw new SerialComException("Can not extract native shared library " + libToExtractFromJar + " from sp-tty.jar file !");
}
}else {
throw new SerialComException("Can not get shared library " + libToExtractFromJar + " resource as stream from sp-tty.jar file !");
}
} catch (Exception e) {
throw (SerialComException) new SerialComException(libFile.toString()).initCause(e);
} finally {
try {
if(output != null) {
output.close();
}
} catch (Exception e) {
// ignore
}
try {
if(input != null) {
input.close();
}
} catch (Exception e) {
// ignore
}
}
// load libraries in reverse order of dependencies
/* Try loading the dynamic shared library from the local file system finally as privileged action */
final File vlibFileFinal = new File(libDirectory.getAbsolutePath() + fileSeparator + vlibName);
final File libFileFinal = libFile;
try {
AccessController.doPrivileged(new PrivilegedAction() {
public Boolean run() {
// vendor supplied shared library
System.load(vlibFileFinal.toString());
return true;
}
});
} catch (Exception e) {
throw (SerialComException) new SerialComException("Could not load " + vlibFileFinal.toString() + " native library !").initCause(e);
} catch (UnsatisfiedLinkError e) {
throw (SerialComException) new SerialComException(e.getMessage()).initCause(e);
}
try {
AccessController.doPrivileged(new PrivilegedAction() {
public Boolean run() {
// JNI glue shared library
System.load(libFileFinal.toString());
return true;
}
});
} catch (Exception e) {
throw (SerialComException) new SerialComException("Could not load " + libFileFinal.toString() + " native library !").initCause(e);
} catch (UnsatisfiedLinkError e) {
throw (SerialComException) new SerialComException(e.getMessage()).initCause(e);
}
return true;
}
/* Native library calls */
public native int readLatch(long handle);
public native int writeLatch(long handle, long mask, long latchValue);
public native String getPartNumber(long handle);
public native String getDeviceProductString(long handle);
public native String getDeviceSerialNumber(long handle);
public native String getDeviceInterfaceString(long handle);
}