Can zip.js support safari browser unZip?

[BarryJame]

When I Quote u Zip.js ,I found it can work very well except iOS Safari Browser,it shows below.

[gildas-lormeau]

As I write this, Safari does not support DataView#getBigUint64 (see here) so it must be polyfilled if you want to read files using zip64. Here is below an implementation based on this response from Stack Overflow. You have to run this script before using zip.js.

if (DataView.prototype.getBigUint64 === undefined) {
  DataView.prototype.getBigUint64 = function(byteOffset, littleEndian) {
    // split 64-bit number into two 32-bit parts
    const left =  this.getUint32(byteOffset, littleEndian);
    const right = this.getUint32(byteOffset+4, littleEndian);

    // combine the two 32-bit values
    const combined = littleEndian? left + 2**32*right : 2**32*left + right;

    if (!Number.isSafeInteger(combined)) {
      console.warn(combined, 'exceeds MAX_SAFE_INTEGER. Precision may be lost');
    }

    return combined;
  };
}

[BarryJame]

thks boss

[phamconganh]

@gildas-lormeau, i get the same issue but it is view.getUnit16 on safari. Can you tell me how to fix this?
TypeError: undefined is not an object (evaluating 't.getUint16')

[gildas-lormeau]

Is it just slow or not running at all?

[phamconganh]

I test on safari 12.2, it's not running. On firefox it's slow. On safari 15 and 16 it's not much different from normal, about 50ms slow

[phamconganh]

On firefox slow about 500ms, on chrome 70+ it's pretty fast, about 30ms. All zip test data from 200Kb with password

[gildas-lormeau]

Do you see any errors when running on Safari? For example zip.js relies on the TransformStream API which is available on Safari since the version 14.1 (see https://developer.mozilla.org/en-US/docs/Web/API/TransformStream/TransformStream#browser_compatibility). If you or your build don't provide a polyfill for this API, it won't work.

[gildas-lormeau]

In addition, I guess the slowness comes from the fact that zip.js uses the DecompressionStream native API which is not available (yet?) on Firefox.