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package ch.jodersky.jni
import java.io.{File, FileOutputStream, InputStream, OutputStream}
import scala.io.Source
/**
* Provides enhanced native library loading functionality.
*/
object NativeLoader {
/** Name of the shared library file that is contained in a jar. */
final val LibraryName = "library"
final val BufferSize = 4096
/** Extract a resource from this class loader to a temporary file. */
private def extract(path: String): Option[File] = {
var in: Option[InputStream] = None
var out: Option[OutputStream] = None
try {
in = Option(NativeLoader.getClass.getResourceAsStream(path))
if (in.isEmpty) return None
val file = File.createTempFile(path, "")
out = Some(new FileOutputStream(file))
val buffer = new Array[Byte](BufferSize)
var length = -1;
do {
length = in.get.read(buffer)
if (length != -1) out.get.write(buffer, 0, length)
} while (length != -1)
Some(file)
} finally {
in.foreach(_.close)
out.foreach(_.close)
}
}
private def loadError(msg: String): Nothing = throw new UnsatisfiedLinkError(
"Error during native library extraction " +
"(this can happen if your platform is not supported): " +
msg
)
def fullLibraryPath(libraryPath: String, platform: Platform) = {
libraryPath + "/native/" + platform.id + "/" + LibraryName
}
private def loadFromJar(libraryPath: String): Unit = {
val platform = Platform.current.getOrElse{
loadError("Cannot determine current platform.")
}
val resource = fullLibraryPath(libraryPath, platform)
val file = extract(resource) getOrElse loadError(
s"Shared library $resource not found."
)
System.load(file.getAbsolutePath())
}
/**
* Load a native library from the available library path or fall back
* to extracting and loading a native library from available resources.
*/
def load(library: String, libraryPath: String): Unit = try {
System.loadLibrary(library)
} catch {
case ex: UnsatisfiedLinkError => loadFromJar(libraryPath)
}
}
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