From f7113c94abce7deec8bece794a3748cbee8a9a08 Mon Sep 17 00:00:00 2001
From: Edoardo La Greca
Date: Thu, 7 Aug 2025 18:40:35 +0200
Subject: implement attach

---
 src/main/kotlin/Connection.kt         | 24 +++++++++++++++++++++++-
 src/main/kotlin/ProtocolTranslator.kt |  8 +++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

(limited to 'src/main/kotlin')

diff --git a/src/main/kotlin/Connection.kt b/src/main/kotlin/Connection.kt
index 13b928d..a7de8cc 100644
--- a/src/main/kotlin/Connection.kt
+++ b/src/main/kotlin/Connection.kt
@@ -114,8 +114,30 @@ class Connection(transLay: TransportLayer) : ProtocolTranslator {
         TODO("Not yet implemented")
     }
 
-    override fun attach() {
+    override fun attach(fid: UInt, afid: UInt, uname: String, aname: String): String? {
+        val omsg = OutMessage(NinePMessageType.TATTACH, this.tagGen.generate(), listOf("fid", "afid", "uname", "aname"),
+            mapOf(
+                "fid" to BigInteger(fid.toString()),
+                "afid" to BigInteger(afid.toString())
+            ),
+            mapOf(
+                "uname" to uname,
+                "aname" to aname
+            ),
+            emptyMap(),
+            this.maxSize
+        )
+        omsg.write(this.tl)
+        val checkErr = checkedInMessage(omsg.tag)
+        if (checkErr.first != null) {
+            return checkErr.first
+        }
+        val imsg = checkErr.second!!
 
+        imsg.applyField(InMessage.Field("qid", InMessage.Field.Type.RAW, 13u))
+        val qid = QID(imsg.fieldsRaw["qid"]!!.toList())
+        this.pathInfo.addPath(PathInfo.Path(aname.split("/"), fid, qid))
+        return null
     }
 
     override fun walk(fid: UInt, newfid: UInt, wname: List<String>): String? {
diff --git a/src/main/kotlin/ProtocolTranslator.kt b/src/main/kotlin/ProtocolTranslator.kt
index 0cdfa53..4dad240 100644
--- a/src/main/kotlin/ProtocolTranslator.kt
+++ b/src/main/kotlin/ProtocolTranslator.kt
@@ -43,8 +43,14 @@ interface ProtocolTranslator {
 
     /**
      * Establish a connection.
+     *
+     * @param fid FID that represents the root directory of the desired file tree.
+     * @param afid A FID previously established by an auth message.
+     * @param uname A user identifier.
+     * @param aname The desired file tree to access.
+     * @return a possible error.
      */
-    fun attach()
+    fun attach(fid: UInt, afid: UInt, uname: String, aname: String): String?
 
     /**
      * Descend a directory hierarchy.
-- 
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