From 3797e28c5b6c819914312b986c0a15f36e7f658b Mon Sep 17 00:00:00 2001
From: Quinten Kock <quintenkock@gmail.com>
Date: Mon, 15 Jun 2020 19:12:11 +0200
Subject: [PATCH] Implement Unmake storing and reading (untested)

---
 Board.h | 51 ++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 34 insertions(+), 17 deletions(-)

diff --git a/Board.h b/Board.h
index 3a13c97..6f461f1 100644
--- a/Board.h
+++ b/Board.h
@@ -3,6 +3,13 @@
 
 #include "Types.h"
 
+struct Unmake {
+	byte sq_from;
+	byte sq_to;
+	byte enpassant;
+};
+
+
 class Board {
   public:
 	Board();
@@ -45,33 +52,49 @@ class Board {
 
 	const byte PTR_ENPASSANT = 0x18;
 
-	const byte UNMAKE_START = 0x1A;
+	const byte PTR_UNMAKE_START = 0x1A;
+	const byte PTR_UNMAKE_LAST = 0x7F;
 	inline byte get_unmake() __attribute__((always_inline)) {
 		return field[PTR_PTR_REVMOV];
 	}
 	byte next_unmake() {
 		field[PTR_PTR_REVMOV]++;
-		if(get_unmake() >= 0x80) {
-			field[PTR_PTR_REVMOV] = UNMAKE_START;
-			return UNMAKE_START;
+		if(get_unmake() > PTR_UNMAKE_LAST) {
+			field[PTR_PTR_REVMOV] = PTR_UNMAKE_START;
+			return PTR_UNMAKE_START;
 		}
-		while(get_unmake() & 0x88) {
-			field[PTR_PTR_REVMOV]++;
+		if(!(get_unmake() & 0x8)) {
+			field[PTR_PTR_REVMOV] += 0x8;
 		}
 		return get_unmake();
 	}
 	byte prev_unmake() {
 		field[PTR_PTR_REVMOV]--;
-		if(get_unmake() < UNMAKE_START) {
-			field[PTR_PTR_REVMOV] = 0x7F;
-			return 0x7F;
+		if(get_unmake() < PTR_UNMAKE_START) {
+			field[PTR_PTR_REVMOV] = PTR_UNMAKE_LAST;
+			return PTR_UNMAKE_LAST;
 		}
-		while(get_unmake() & 0x88) {
-			field[PTR_PTR_REVMOV]--;
+		if(!(get_unmake() & 0x8)) {
+			field[PTR_PTR_REVMOV] -= 0x8;
 		}
 		return get_unmake();
 	}
 
+	void store_unmake(Unmake *u) {
+		field[get_unmake()] = *(byte*)u;
+		for(size_t i = 0; i < sizeof(u); i++) {
+			field[next_unmake()] = *(byte*)(u+i);
+		}
+	}
+	Unmake read_unmake() {
+		Unmake u;
+		byte* ptr = (byte*) &u;
+		for(size_t i = sizeof(u) - 1; i >= 0; i++) {
+			ptr[i] = field[prev_unmake()];
+		}
+		return u;
+	}
+
 
 };
 
@@ -81,10 +104,4 @@ Board::Board() {
 }
 
 
-struct Unmake {
-	byte sq_from;
-	byte sq_to;
-	byte enpassant;
-};
-
 #endif