binary insert and buffer uniqify.

lib/bcoin/utils.js

@@ -2511,7 +2511,12 @@ utils.binarySearch = function binarySearch(items, key, compare, insert) {
 
 utils.binaryInsert = function binaryInsert(items, item, compare) {
   var i = utils.binarySearch(items, item, compare, true);
-  items.splice(i, 0, item);
+  if (i === 0)
+    items.unshift(item);
+  else if (i === items.length)
+    items.push(item);
+  else
+    items.splice(i, 0, item);
   return i;
 };
 
@@ -2531,6 +2536,34 @@ utils.binaryRemove = function binaryRemove(items, item, compare) {
   return true;
 };
 
+/**
+ * Unique-ify and sort an array of buffers.
+ * @param {Buffer[]} items
+ * @returns {Buffer[]}
+ */
+
+utils.uniqBuffer = function uniqBuffer(items) {
+  var out = [];
+  var i, j, item;
+
+  for (i = 0; i < items.length; i++) {
+    item = items[i];
+    j = utils.binarySearch(out, item, utils.cmp, true);
+
+    if (j < out.length && utils.cmp(out[j], item) === 0)
+      continue;
+
+    if (j === 0)
+      out.unshift(item);
+    else if (j === out.length)
+      out.push(item);
+    else
+      out.splice(j, 0, item);
+  }
+
+  return out;
+};
+
 /**
  * Normalize a path.
  * @param {String} path