Initial commit, 2 years later

1 files changed, 106 insertions, 0 deletions

diff --git a/java/sources/digital/cabin/ezipc/EzIPC.java b/java/sources/digital/cabin/ezipc/EzIPC.java
new file mode 100644
index 0000000..7c9943d
--- /dev/null
+++ b/java/sources/digital/cabin/ezipc/EzIPC.java
@@ -0,0 +1,106 @@
+package digital.cabin.ezipc;
+
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+import com.sun.jna.Library;
+import com.sun.jna.Native;
+import com.sun.jna.platform.linux.ErrNo;
+
+
+public abstract class EzIPC
+{
+    protected interface LibraryNamedFIFO extends Library
+    {
+        static LibraryNamedFIFO INSTANCE =
+            Native.load("c", LibraryNamedFIFO.class);
+
+        public int mkfifo(String pathname, int mode);
+    }
+
+
+    protected LibraryNamedFIFO lib;
+
+    protected String connPath;
+
+    protected FileInputStream  in_pipe;
+    protected FileOutputStream out_pipe;
+
+
+    public EzIPC(String connPath) throws IOException
+    {
+        this.lib = LibraryNamedFIFO.INSTANCE;
+        this.connPath = connPath;
+
+        if(lib.mkfifo(connPath+"_c2s", 0660) != 0)
+            if(Native.getLastError() != ErrNo.EEXIST)
+                throw new IOException("Could not create client->server pipe");
+
+        if(lib.mkfifo(connPath+"_s2c", 0660) != 0)
+            if(Native.getLastError() != ErrNo.EEXIST)
+                throw new IOException("Could not create server->client pipe");
+
+        this.in_pipe  = null;
+        this.out_pipe = null;
+    }
+
+    public abstract void open() throws IOException;
+
+    public void close() throws IOException
+    {
+        if(in_pipe  != null)  in_pipe.close();
+        if(out_pipe != null) out_pipe.close();
+    }
+
+
+    // FIXME: check write() return val
+    public boolean send(byte[] data) throws IOException
+    {
+        if(out_pipe == null) return false;
+        if(data.length == 0) return true;
+
+        // FIXME: JAVA DOES NOT HAVE FUCKING UNSIGNED BRO
+        ByteBuffer bb = ByteBuffer.allocate(8);
+        bb.order(ByteOrder.nativeOrder()); // Imagine not being native by def.
+        bb.putLong(data.length);
+
+        out_pipe.write(bb.array());
+        out_pipe.write(data);
+
+        return true;
+    }
+
+    // FIXME: check write() return val
+    public boolean receive(byte[] data) throws IOException
+    {
+        if(in_pipe == null)  return false;
+        if(data.length == 0) return true;
+
+        byte[] bytes = new byte[8];
+
+        // FIXME: yikes
+        while(in_pipe.available() < 8);
+        in_pipe.read(bytes);
+
+        ByteBuffer bb = ByteBuffer.wrap(bytes);
+        bb.order(ByteOrder.nativeOrder()); // Imagine not being native by def.
+
+        // FIXME: JAVA DOES NOT HAVE FUCKING UNSIGNED BRO
+        long in_size   = bb.getLong();
+        long read_size = in_size > data.length ? data.length : in_size;
+
+        // FIXME: yikes
+        while(in_pipe.available() < read_size);
+        long read = in_pipe.read(data);
+
+        // truncate
+        for(long i = 0; i < (in_size - read_size); i++) in_pipe.read();
+
+        return true;
+    }
+}