implement 'getTextureFile' and 'getTexturePreview' Netop

client/src/main/kotlin/org/hso/texturesyncclient/controller/net/Connection.kt

@@ -1,6 +1,8 @@
 package org.hso.texturesyncclient.controller.net
 
 import com.google.gson.*
+import javafx.scene.image.Image
+import org.hso.texturesyncclient.model.Sha256
 import org.hso.texturesyncclient.model.Texture
 import java.io.*
 import java.lang.RuntimeException
@@ -164,6 +166,54 @@ class Connection(val address: InetAddress, val port: Int = 10796) : Closeable {
 
     }
 
+    @Throws(IOException::class, ConnectionException::class)
+    @Synchronized
+    fun getTextureFile(hash : Sha256) : ByteArray {
+        val io = getStreams()
+
+        val obj = JsonObject()
+        obj.add("get_texture_file", {
+            val inner = JsonObject()
+            inner.addProperty("texture_hash", hash.toString())
+            inner
+        }())
+
+        JsonPackage(obj).write(io.second)
+
+        when (val pkg = Package.read(io.first)) {
+            is JsonPackage -> throw ConnectionUnexpecedPacketException()
+            is BinaryPackage -> return pkg.content
+            is ErrorPackage -> throw ConnectionErrorException(pkg)
+            else -> throw RuntimeException("Unreachable")
+        }
+
+    }
+
+    @Throws(IOException::class, ConnectionException::class)
+    @Synchronized
+    fun getTexturePreview(hash : Sha256) : Image {
+        val io = getStreams()
+
+        val obj = JsonObject()
+        obj.add("get_texture_file", {
+            val inner = JsonObject()
+            inner.addProperty("texture_hash", hash.toString())
+            inner.addProperty("desired_format", "jpeg")
+            inner
+        }())
+
+        JsonPackage(obj).write(io.second)
+
+        when (val pkg = Package.read(io.first)) {
+            is JsonPackage -> throw ConnectionUnexpecedPacketException()
+            is BinaryPackage -> {
+                return Image(ByteArrayInputStream(pkg.content))
+            }
+            is ErrorPackage -> throw ConnectionErrorException(pkg)
+            else -> throw RuntimeException("Unreachable")
+        }
+    }
+
     @Throws(IOException::class)
     @Synchronized
     override fun close() {