core/inflator.js

   1 import { inflateInit, inflate, inflateReset } from "../vendor/pako/lib/zlib/inflate.js";
   2 import ZStream from "../vendor/pako/lib/zlib/zstream.js";
   3
   4 Inflate.prototype = {
   5     inflate: function (data, flush, expected) {
   6         this.strm.input = data;
   7         this.strm.avail_in = this.strm.input.length;
   8         this.strm.next_in = 0;
   9         this.strm.next_out = 0;
  10
  11         // resize our output buffer if it's too small
  12         // (we could just use multiple chunks, but that would cause an extra
  13         // allocation each time to flatten the chunks)
  14         if (expected > this.chunkSize) {
  15             this.chunkSize = expected;
  16             this.strm.output = new Uint8Array(this.chunkSize);
  17         }
  18
  19         this.strm.avail_out = this.chunkSize;
  20
  21         inflate(this.strm, flush);
  22
  23         return new Uint8Array(this.strm.output.buffer, 0, this.strm.next_out);
  24     },
  25
  26     reset: function () {
  27         inflateReset(this.strm);
  28     }
  29 };
  30
  31 export default function Inflate() {
  32     this.strm = new ZStream();
  33     this.chunkSize = 1024 * 10 * 10;
  34     this.strm.output = new Uint8Array(this.chunkSize);
  35     this.windowBits = 5;
  36
  37     inflateInit(this.strm, this.windowBits);
  38 };