fix reverse buffertools use

Block.js

@@ -94,14 +94,14 @@ function spec(b) {
 
     // TODO: Create a compare method in node-buffertools that uses the correct
     //       endian so we don't have to reverse both buffers before comparing.
-    this.hash.reverse();
+    buffertools.reverse(this.hash);
 
     if (buffertools.compare(this.hash, target) > 0) {
       throw new VerificationError('Difficulty target not met');
     }
 
     // Return the hash to its normal order
-    this.hash.reverse();
+    buffertools.reverse(this.hash);
 
     return true;
   };

ScriptInterpreter.js

@@ -836,7 +836,7 @@ function spec(b) {
 
     var w = new Buffer(v.length);
     v.copy(w);
-    w.reverse();
+    w = buffertools.reverse(w);
     if (w[0] & 0x80) {
       w[0] &= 0x7f;
       return bignum.fromBuffer(w).neg();
@@ -859,9 +859,9 @@ function spec(b) {
         c = new Buffer(b.length + 1);
         b.copy(c, 1);
         c[0] = 0;
-        return c.reverse();
+        return buffertools.reverse(c);
       } else {
-        return b.reverse();
+        return buffertools.reverse(b);
       }
     } else if (cmp == 0) {
       return new Buffer([]);
@@ -871,10 +871,10 @@ function spec(b) {
         c = new Buffer(b.length + 1);
         b.copy(c, 1);
         c[0] = 0x80;
-        return c.reverse();
+        return buffertools.reverse(c);
       } else {
         b[0] |= 0x80;
-        return b.reverse();
+        return buffertools.reverse(b);
       }
     }
   };

Transaction.js

@@ -557,7 +557,7 @@ function spec(b) {
     var ins = this.ins.map(function (txin) {
       var txinObj = {
         prev_out: {
-          hash: new Buffer(txin.getOutpointHash()).reverse().toString('hex'),
+          hash: buffertools.reverse(new Buffer(txin.getOutpointHash())).toString('hex'),
           n: txin.getOutpointIndex()
         }
       };
@@ -607,7 +607,7 @@ function spec(b) {
       txin.q = 0xffffffff;
 
       var hash = new Buffer(inputobj.txid, 'hex');
-      hash.reverse();
+      hash = buffertools.reverse(hash);
       var vout = parseInt(inputobj.vout);
       var voutBuf = new Buffer(4);
       voutBuf.writeUInt32LE(vout, 0);

util/util.js

@@ -32,7 +32,7 @@ var formatHash = exports.formatHash = function (hash) {
   // Make a copy, because reverse() and toHex() are destructive.
   var hashEnd = new Buffer(10);
   hash.copy(hashEnd, 0, 22, 32);
-  return hashEnd.reverse().toString('hex');
+  return buffertools.reverse(hashEnd).toString('hex');
 };
 
 /**
@@ -42,7 +42,7 @@ var formatHashFull = exports.formatHashFull = function (hash) {
   // Make a copy, because reverse() and toHex() are destructive.
   var copy = new Buffer(hash.length);
   hash.copy(copy);
-  var hex = copy.reverse().toHex();
+  var hex = buffertools.reverse(copy).toHex();
   return hex;
 };