Add InvType

Signed-off-by: Graham <gpe@openrs2.org>

cache-550/src/main/kotlin/org/openrs2/cache/config/inv/InvType.kt

@@ -0,0 +1,24 @@
+package org.openrs2.cache.config.inv
+
+import io.netty.buffer.ByteBuf
+import org.openrs2.cache.config.ConfigType
+
+public class InvType(id: Int) : ConfigType(id) {
+    public var size: Int = 0
+
+    override fun read(buf: ByteBuf, code: Int) {
+        when (code) {
+            2 -> size = buf.readUnsignedShort()
+            else -> throw IllegalArgumentException("Unsupported config code: $code")
+        }
+    }
+
+    override fun write(buf: ByteBuf) {
+        if (size != 0) {
+            buf.writeByte(2)
+            buf.writeShort(size)
+        }
+
+        buf.writeByte(0)
+    }
+}

cache-550/src/main/kotlin/org/openrs2/cache/config/inv/InvTypeList.kt

@@ -0,0 +1,19 @@
+package org.openrs2.cache.config.inv
+
+import org.openrs2.cache.Cache
+import org.openrs2.cache.Js5Archive
+import org.openrs2.cache.Js5ConfigGroup
+import org.openrs2.cache.config.GroupConfigTypeList
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+public class InvTypeList @Inject constructor(cache: Cache) : GroupConfigTypeList<InvType>(
+    cache,
+    archive = Js5Archive.CONFIG,
+    group = Js5ConfigGroup.INVTYPE
+) {
+    override fun allocate(id: Int): InvType {
+        return InvType(id)
+    }
+}