From 8e5b09c28644fba6078728aacf515d1af8c218ba Mon Sep 17 00:00:00 2001
From: Edoardo La Greca
Date: Sat, 9 Aug 2025 18:44:09 +0200
Subject: implement open and add FileMode

---
 src/main/kotlin/Connection.kt | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

(limited to 'src/main/kotlin/Connection.kt')

diff --git a/src/main/kotlin/Connection.kt b/src/main/kotlin/Connection.kt
index 6630567..1aeb4b1 100644
--- a/src/main/kotlin/Connection.kt
+++ b/src/main/kotlin/Connection.kt
@@ -2,8 +2,10 @@ import except.MsizeValueTooBigException
 import except.RErrorException
 import except.UnaccessibleFileException
 import except.UnknownVersionException
+import java.io.File
 import java.io.IOException
 import java.math.BigInteger
+import kotlin.io.path.Path
 
 /**
  * This class represents a 9P connection. It provides a practical implementation with networking to the 9P methods
@@ -182,8 +184,25 @@ class Connection(transLay: TransportLayer) : ProtocolTranslator {
         this.pathInfo.addPath(PathInfo.Path(wname, newfid, qids.last()))
     }
 
-    override fun open(path: String) {
-        TODO("Not yet implemented")
+    override fun open(fid: UInt, mode: FileMode): Pair<QID, UInt> {
+        val omsg = OutMessage(NinePMessageType.TOPEN, this.tagGen.generate(), listOf("fid", "mode"),
+            mapOf(
+                "fid" to BigInteger(fid.toString()),
+                "mode" to BigInteger(mode.toModeByte().toString())
+            ),
+            emptyMap(),
+            emptyMap(),
+            this.maxSize
+        )
+        omsg.write(this.tl)
+        val imsg = checkedInMessage(omsg.tag)
+        imsg.applySchema(listOf(
+            InMessage.Field("qid", InMessage.Field.Type.RAW, 13u),
+            InMessage.Field("iounit", InMessage.Field.Type.INTEGER, 4u)
+        ))
+        val qid = QID(imsg.fieldsRaw["qid"]!!.toList())
+        val iounit = imsg.fieldsInt["iounit"]!!.toInt().toUInt()
+        return Pair(qid, iounit)
     }
 
     override fun create(path: String) {
-- 
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