From 447fc70ad2f9f92380724d56f5bfa95e22d96f62 Mon Sep 17 00:00:00 2001
From: Collin Smith <collinsmith70@gmail.com>
Date: Mon, 17 Aug 2020 20:31:28 -0700
Subject: [PATCH] Stubbed out D2SReader#copyTo(D2S,CharData)

---
 core/src/com/riiablo/save/d2s/D2SReader.java  | 40 ++++++++++++++++++-
 .../src/com/riiablo/save/d2s/D2SReader96.java |  8 ++++
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/core/src/com/riiablo/save/d2s/D2SReader.java b/core/src/com/riiablo/save/d2s/D2SReader.java
index 438123dc..21ca842a 100644
--- a/core/src/com/riiablo/save/d2s/D2SReader.java
+++ b/core/src/com/riiablo/save/d2s/D2SReader.java
@@ -1,5 +1,6 @@
 package com.riiablo.save.d2s;
 
+import io.netty.util.ByteProcessor;
 import org.apache.logging.log4j.Logger;
 
 import com.riiablo.io.ByteInput;
@@ -8,12 +9,30 @@ import com.riiablo.io.UnsafeNarrowing;
 import com.riiablo.item.ItemReader;
 import com.riiablo.log.Log;
 import com.riiablo.log.LogManager;
+import com.riiablo.save.CharData;
 
 public enum D2SReader {
   INSTANCE;
 
   private static final Logger log = LogManager.getLogger(D2SReader.class);
 
+  // set the value of it in the d2s data to be zero and iterate through all the bytes
+  public int calculateChecksum(ByteInput in) {
+    ChecksumCalculator checksumCalculator = new ChecksumCalculator();
+    in.buffer().forEachByte(checksumCalculator);
+    return checksumCalculator.checksum;
+  }
+
+  private static class ChecksumCalculator implements ByteProcessor {
+    int checksum = 0;
+
+    @Override
+    public boolean process(byte value) {
+      checksum = (checksum << 1) + value;
+      return true;
+    }
+  }
+
   public D2S readD2S(ByteInput in) {
     log.trace("Reading d2s...");
     log.trace("Validating d2s signature");
@@ -59,10 +78,29 @@ public enum D2SReader {
         case D2S.VERSION_109:
         default:
           log.error("Unsupported d2s version: " + D2S.getVersionString(d2s.version));
+          return d2s;
+      }
+    } finally {
+      Log.remove("d2s.version");
+    }
+  }
+
+  CharData copyTo(D2S d2s, CharData data) {
+    try {
+      Log.put("d2s.version", d2s.version);
+      switch (d2s.version) {
+        case D2S.VERSION_110:
+          return D2SReader96.copyTo(d2s, data);
+        case D2S.VERSION_100:
+        case D2S.VERSION_107:
+        case D2S.VERSION_108:
+        case D2S.VERSION_109:
+        default:
+          log.error("Unsupported d2s version: " + D2S.getVersionString(d2s.version));
+          return data;
       }
     } finally {
       Log.remove("d2s.version");
     }
-    return d2s;
   }
 }
diff --git a/core/src/com/riiablo/save/d2s/D2SReader96.java b/core/src/com/riiablo/save/d2s/D2SReader96.java
index 15cd82c0..2b390d26 100644
--- a/core/src/com/riiablo/save/d2s/D2SReader96.java
+++ b/core/src/com/riiablo/save/d2s/D2SReader96.java
@@ -19,6 +19,7 @@ import com.riiablo.item.ItemReader;
 import com.riiablo.item.Stat;
 import com.riiablo.log.Log;
 import com.riiablo.log.LogManager;
+import com.riiablo.save.CharData;
 import com.riiablo.util.DebugUtils;
 
 public class D2SReader96 {
@@ -441,4 +442,11 @@ public class D2SReader96 {
     }
     return golem;
   }
+
+  static CharData copyTo(D2S d2s, CharData data) {
+    throw new UnsupportedOperationException();
+  }
+
+  // TODO: Tuples should be specific to versions -- versions may have different data types, fields, etc
+//  static class D2SData extends D2S {}
 }