fix inflate wrapper check condition, issue #65

lib/inflate.js

@@ -177,6 +177,8 @@ Inflate.prototype.push = function(data, mode) {
   var chunkSize = this.options.chunkSize;
   var status, _mode;
   var next_out_utf8, tail, utf8str;
+  // allow Z_BUF_ERROR on next inflate call
+  var allowBufError = 0;
 
   if (this.ended) { return false; }
   _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);
@@ -203,6 +205,11 @@ Inflate.prototype.push = function(data, mode) {
 
     status = zlib_inflate.inflate(strm, c.Z_NO_FLUSH);    /* no bad return value */
 
+    if (status === c.Z_BUF_ERROR && allowBufError === 1) {
+      status = c.Z_OK;
+      allowBufError = 0;
+    }
+
     if (status !== c.Z_STREAM_END && status !== c.Z_OK) {
       this.onEnd(status);
       this.ended = true;
@@ -231,7 +238,11 @@ Inflate.prototype.push = function(data, mode) {
         }
       }
     }
-  } while ((strm.avail_in > 0) && status !== c.Z_STREAM_END);
+    // we need to check internal inflate buffers and state but inflate can return Z_BUF_ERROR if no output
+    if (strm.avail_in === 0 && strm.avail_out === 0) {
+      allowBufError = 1;
+    }
+  } while ((strm.avail_in > 0 || strm.avail_out === 0) && status !== c.Z_STREAM_END);
 
   if (status === c.Z_STREAM_END) {
     _mode = c.Z_FINISH;