diff --git a/lib/zlib/deflate.js b/lib/zlib/deflate.js
index edd21c9..3dbdc8f 100644
--- a/lib/zlib/deflate.js
+++ b/lib/zlib/deflate.js
@@ -457,26 +457,23 @@ function lm_init(s) {
 }
 
 function DeflateState() {
-  this.status = 0;
-  /* as the name implies */
-  //this.pending_buf = Z_NULL;    /* output still pending */
-  this.pending_buf_size = 0;
-  /* size of pending_buf */
-  this.pending_out = 0;
-  /* next pending byte to output to the stream */
-  this.pending = 0;
-  /* nb of bytes in the pending buffer */
-  this.last_flush = Z_NULL;
-  /* value of flush param for previous deflate call */
+  // z_streamp strm;            /* pointer back to this zlib stream */
+  this.status = 0;            /* as the name implies */
+  // pending_buf = Z_NULL;      /* output still pending */
+  this.pending_buf_size = 0;  /* size of pending_buf */
+  this.pending_out = 0;       /* next pending byte to output to the stream */
+  this.pending = 0;           /* nb of bytes in the pending buffer */
+  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */
+  //  gz_headerp  gzhead;       /* gzip header information to write */
+  //  uInt   gzindex;           /* where in extra, name, or comment */
+  //  Byte  method;             /* can only be DEFLATED */
+  this.last_flush = Z_NULL;   /* value of flush param for previous deflate call */
 
-  this.w_size = 0;
-  /* LZ77 window size (32K by default) */
-  this.w_bits = 0;
-  /* log2(w_size)  (8..16) */
-  this.w_mask = 0;
-  /* w_size - 1 */
+  this.w_size = 0;  /* LZ77 window size (32K by default) */
+  this.w_bits = 0;  /* log2(w_size)  (8..16) */
+  this.w_mask = 0;  /* w_size - 1 */
 
-  //this.window = Z_NULL;
+  this.window = null;
   /* Sliding window. Input bytes are read into the second half of the window,
    * and move to the first half later to keep a dictionary of at least wSize
    * bytes. With this organization, matches are limited to a distance of
@@ -495,17 +492,12 @@ function DeflateState() {
    * An index in this array is thus a window index modulo 32K.
    */
 
-  this.head = null;
-  /* Heads of the hash chains or NIL. */
+  this.head = null;   /* Heads of the hash chains or NIL. */
 
-  this.ins_h = 0;
-  /* hash index of string to be inserted */
-  this.hash_size = 0;
-  /* number of elements in hash table */
-  this.hash_bits = 0;
-  /* log2(hash_size) */
-  this.hash_mask = 0;
-  /* hash_size-1 */
+  this.ins_h = 0;       /* hash index of string to be inserted */
+  this.hash_size = 0;   /* number of elements in hash table */
+  this.hash_bits = 0;   /* log2(hash_size) */
+  this.hash_mask = 0;   /* hash_size-1 */
 
   this.hash_shift = 0;
   /* Number of bits by which ins_h must be shifted at each input
@@ -519,18 +511,12 @@ function DeflateState() {
    * negative when the window is moved backwards.
    */
 
-  this.match_length = 0;
-  /* length of best match */
-  this.prev_match = 0;
-  /* previous match */
-  this.match_available = 1;
-  /* set if previous match exists */
-  this.strstart = 0;
-  /* start of string to insert */
-  this.match_start = 0;
-  /* start of matching string */
-  this.lookahead = 0;
-  /* number of valid bytes ahead in window */
+  this.match_length = 0;      /* length of best match */
+  this.prev_match = 0;        /* previous match */
+  this.match_available = 1;   /* set if previous match exists */
+  this.strstart = 0;          /* start of string to insert */
+  this.match_start = 0;       /* start of matching string */
+  this.lookahead = 0;         /* number of valid bytes ahead in window */
 
   this.prev_length = 0;
   /* Length of the best match at previous step. Matches not greater than this
@@ -554,10 +540,8 @@ function DeflateState() {
    * max_insert_length is used only for compression levels <= 3.
    */
 
-  this.level = 0;
-  /* compression level (1..9) */
-  this.strategy = 0;
-  /* favor or force Huffman coding*/
+  this.level = 0;     /* compression level (1..9) */
+  this.strategy = 0;  /* favor or force Huffman coding*/
 
   this.good_match = 0;
   /* Use a faster search when the previous match is longer than this */