fix blocks when start, end are set

Author: mafintosh

lib/replicator.js

@@ -910,9 +910,9 @@ module.exports = class Replicator {
   }
 
   addRange (session, { start = 0, end = -1, length = toLength(start, end), blocks = null, linear = false } = {}) {
-    if (blocks !== null) {
-      if (start >= blocks.length) start = blocks.length
-      if (length === -1 || start + length > blocks.length) length = blocks.length - start
+    if (blocks !== null) { // if using blocks, start, end just acts as frames around the blocks array
+      start = 0
+      end = length = blocks.length
     }
 
     const r = new RangeRequest(this._ranges, start, length === -1 ? -1 : start + length, linear, blocks)