From b273bec120da3957862353006014c39c30d39bc8 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Thu, 21 Jan 2016 03:39:36 -0800
Subject: [PATCH] chaindb: checksum.

---
 lib/bcoin/chain.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index ca2c82a4..161bdadd 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -191,7 +191,7 @@ Chain.prototype.resetHeight = function resetHeight(height) {
     existing = this.db.get(i);
     assert(existing);
     delete this.heightLookup[existing.hash];
-    this.db.del(i);
+    this.db.remove(i);
   }
 
   this.tip = this.db.get(height);
@@ -690,6 +690,7 @@ Chain.prototype.fromJSON = function fromJSON(json) {
  */
 
 var BLOCK_SIZE = 112;
+// var BLOCK_SIZE = 116;
 
 function ChainDB(chain, options) {
   if (!(this instanceof ChainDB))
@@ -897,7 +898,7 @@ ChainDB.prototype.saveAsync = function save(entry, callback) {
   });
 };
 
-ChainDB.prototype.del = function del(height) {
+ChainDB.prototype.remove = function remove(height) {
   assert(height >= 0);
 
   this._write(this._nullBlock, height * BLOCK_SIZE);
@@ -908,7 +909,12 @@ ChainDB.prototype.del = function del(height) {
   if ((height + 1) * BLOCK_SIZE === this.size) {
     while (this.isNull(height))
       height--;
+
+    if (height < 0)
+      height = 0;
+
     fs.ftruncateSync(this.fd, (height + 1) * BLOCK_SIZE);
+
     this.size = (height + 1) * BLOCK_SIZE;
     this.tip = height;
   }
@@ -1097,11 +1103,14 @@ ChainBlock.prototype.toRaw = function toRaw() {
   utils.writeU32(res, this.bits, 72);
   utils.writeU32(res, this.nonce, 76);
   utils.copy(this.chainwork.toArray('be', 32), res, 80);
+  // utils.copy(utils.checksum(res.slice(0, 112)), res, 112);
 
   return res;
 };
 
 ChainBlock.fromRaw = function fromRaw(chain, height, p) {
+  // if (!utils.isEqual(utils.checksum(p.slice(0, 112)), p.slice(112, 116)))
+  //   throw new Error('Bad checksum');
   return new ChainBlock(chain, {
     height: height,
     hash: utils.toHex(utils.dsha256(p.slice(0, 80))),