Simple conversion script that converts Godot html5 export to gzipped version, with decompressing wasm and pck files using pako

convert.sh

#!/bin/bash
### usage ./convert.sh game
## where game is baseName of the export
 
if [ ! "$1" ]; then
    read -p 'Game name: ' game
else
    game="$1"
fi

echo "gzipping wasm and pck files"

gzip -f "$game.wasm"
gzip -f "$game.pck"

f="$game.html"
if [ -f $f -a -r $f ]; then
f="$f"
else
f="index.html"
fi
 
inflate=$(cat <<\EOF
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e;f--,c+=a[o++]<<de,de+=8}e.adler=i.check=n(c),c=0,de=0,i.mode=M;case M:if(0===i.havedict)return e.next_out=s,e.avail_out=u,e.next_in=o,e.avail_in=f,i.hold=c,i.bits=de,B;e.adler=i.check=1,i.mode=K;case K:if(t===x||t===y)break e;case P:if(i.last){c>>>=7&de,de-=7&de,i.mode=ae;break}for(;de<3;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}switch(i.last=1&c,c>>>=1,de-=1,3&c){case 0:i.mode=Y;break;case 1:if(l(i),i.mode=Q,t===y){c>>>=2,de-=2;break e}break;case 2:i.mode=X;break;case 3:e.msg="invalid block type",i.mode=se}c>>>=2,de-=2;break;case Y:for(c>>>=7&de,de-=7&de;de<32;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if((65535&c)!=(c>>>16^65535)){e.msg="invalid stored block lengths",i.mode=se;break}if(i.length=65535&c,c=0,de=0,i.mode=q,t===y)break e;case q:i.mode=G;case G:if(he=i.length){if(he>f&&(he=f),he>u&&(he=u),0===he)break e;h.arraySet(r,a,o,he,s),f-=he,o+=he,u-=he,s+=he,i.length-=he;break}i.mode=K;break;case X:for(;de<14;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if(i.nlen=257+(31&c),c>>>=5,de-=5,i.ndist=1+(31&c),c>>>=5,de-=5,i.ncode=4+(15&c),c>>>=4,de-=4,i.nlen>286||i.ndist>30){e.msg="too many length or distance symbols",i.mode=se;break}i.have=0,i.mode=W;case W:for(;i.have<i.ncode;){for(;de<3;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}i.lens[Ae[i.have++]]=7&c,c>>>=3,de-=3}for(;i.have<19;)i.lens[Ae[i.have++]]=0;if(i.lencode=i.lendyn,i.lenbits=7,Se={bits:i.lenbits},ye=k(_,i.lens,0,19,i.lencode,0,i.work,Se),i.lenbits=Se.bits,ye){e.msg="invalid code lengths set",i.mode=se;break}i.have=0,i.mode=J;case J:for(;i.have<i.nlen+i.ndist;){for(;Be=i.lencode[c&(1<<i.lenbits)-1],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(me<=de);){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if(_e<16)c>>>=me,de-=me,i.lens[i.have++]=_e;else{if(16===_e){for(Ee=me+2;de<Ee;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if(c>>>=me,de-=me,0===i.have){e.msg="invalid bit length repeat",i.mode=se;break}xe=i.lens[i.have-1],he=3+(3&c),c>>>=2,de-=2}else if(17===_e){for(Ee=me+3;de<Ee;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}de-=me,xe=0,he=3+(7&(c>>>=me)),c>>>=3,de-=3}else{for(Ee=me+7;de<Ee;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}de-=me,xe=0,he=11+(127&(c>>>=me)),c>>>=7,de-=7}if(i.have+he>i.nlen+i.ndist){e.msg="invalid bit length repeat",i.mode=se;break}for(;he--;)i.lens[i.have++]=xe}}if(i.mode===se)break;if(0===i.lens[256]){e.msg="invalid code -- missing end-of-block",i.mode=se;break}if(i.lenbits=9,Se={bits:i.lenbits},ye=k(g,i.lens,0,i.nlen,i.lencode,0,i.work,Se),i.lenbits=Se.bits,ye){e.msg="invalid literal/lengths set",i.mode=se;break}if(i.distbits=6,i.distcode=i.distdyn,Se={bits:i.distbits},ye=k(v,i.lens,i.nlen,i.ndist,i.distcode,0,i.work,Se),i.distbits=Se.bits,ye){e.msg="invalid distances set",i.mode=se;break}if(i.mode=Q,t===y)break e;case Q:i.mode=V;case V:if(f>=6&&u>=258){e.next_out=s,e.avail_out=u,e.next_in=o,e.avail_in=f,i.hold=c,i.bits=de,m(e,ce),s=e.next_out,r=e.output,u=e.avail_out,o=e.next_in,a=e.input,f=e.avail_in,c=i.hold,de=i.bits,i.mode===K&&(i.back=-1);break}for(i.back=0;Be=i.lencode[c&(1<<i.lenbits)-1],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(me<=de);){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if(ke&&0==(240&ke)){for(ge=me,ve=ke,pe=_e;Be=i.lencode[pe+((c&(1<<ge+ve)-1)>>ge)],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(ge+me<=de);){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}c>>>=ge,de-=ge,i.back+=ge}if(c>>>=me,de-=me,i.back+=me,i.length=_e,0===ke){i.mode=ne;break}if(32&ke){i.back=-1,i.mode=K;break}if(64&ke){e.msg="invalid literal/length code",i.mode=se;break}i.extra=15&ke,i.mode=$;case $:if(i.extra){for(Ee=i.extra;de<Ee;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}i.length+=c&(1<<i.extra)-1,c>>>=i.extra,de-=i.extra,i.back+=i.extra}i.was=i.length,i.mode=ee;case ee:for(;Be=i.distcode[c&(1<<i.distbits)-1],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(me<=de);){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if(0==(240&ke)){for(ge=me,ve=ke,pe=_e;Be=i.distcode[pe+((c&(1<<ge+ve)-1)>>ge)],me=Be>>>24,ke=Be>>>16&255,_e=65535&Be,!(ge+me<=de);){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}c>>>=ge,de-=ge,i.back+=ge}if(c>>>=me,de-=me,i.back+=me,64&ke){e.msg="invalid distance code",i.mode=se;break}i.offset=_e,i.extra=15&ke,i.mode=te;case te:if(i.extra){for(Ee=i.extra;de<Ee;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}i.offset+=c&(1<<i.extra)-1,c>>>=i.extra,de-=i.extra,i.back+=i.extra}if(i.offset>i.dmax){e.msg="invalid distance too far back",i.mode=se;break}i.mode=ie;case ie:if(0===u)break e;if(he=ce-u,i.offset>he){if((he=i.offset-he)>i.whave&&i.sane){e.msg="invalid distance too far back",i.mode=se;break}he>i.wnext?(he-=i.wnext,be=i.wsize-he):be=i.wnext-he,he>i.length&&(he=i.length),we=i.window}else we=r,be=s-i.offset,he=i.length;he>u&&(he=u),u-=he,i.length-=he;do{r[s++]=we[be++]}while(--he);0===i.length&&(i.mode=V);break;case ne:if(0===u)break e;r[s++]=i.length,u--,i.mode=V;break;case ae:if(i.wrap){for(;de<32;){if(0===f)break e;f--,c|=a[o++]<<de,de+=8}if(ce-=u,e.total_out+=ce,i.total+=ce,ce&&(e.adler=i.check=i.flags?w(i.check,r,ce,s-ce):b(i.check,r,ce,s-ce)),ce=u,(i.flags?c:n(c))!==i.check){e.msg="incorrect data check",i.mode=se;break}c=0,de=0}i.mode=re;case re:if(i.wrap&&i.flags){for(;de<32;){if(0===f)break e;f--,c+=a[o++]<<de,de+=8}if(c!==(4294967295&i.total)){e.msg="incorrect length check",i.mode=se;break}c=0,de=0}i.mode=oe;case oe:ye=E;break e;case se:ye=A;break e;case fe:return z;case le:default:return Z}return e.next_out=s,e.avail_out=u,e.next_in=o,e.avail_in=f,i.hold=c,i.bits=de,(i.wsize||ce!==e.avail_out&&i.mode<se&&(i.mode<ae||t!==p))&&d(e,e.output,e.next_out,ce-e.avail_out)?(i.mode=fe,z):(ue-=e.avail_in,ce-=e.avail_out,e.total_in+=ue,e.total_out+=ce,i.total+=ce,i.wrap&&ce&&(e.adler=i.check=i.flags?w(i.check,r,ce,e.next_out-ce):b(i.check,r,ce,e.next_out-ce)),e.data_type=i.bits+(i.last?64:0)+(i.mode===K?128:0)+(i.mode===Q||i.mode===q?256:0),(0===ue&&0===ce||t===p)&&ye===S&&(ye=R),ye)},i.inflateEnd=function(e){if(!e||!e.state)return Z;var t=e.state;return t.window&&(t.window=null),e.state=null,S},i.inflateGetHeader=function(e,t){var i;return e&&e.state?0==(2&(i=e.state).wrap)?Z:(i.head=t,t.done=!1,S):Z},i.inflateSetDictionary=function(e,t){var i,n,a=t.length;return e&&e.state?0!==(i=e.state).wrap&&i.mode!==M?Z:i.mode===M&&(n=1,(n=b(n,t,a,0))!==i.check)?A:d(e,t,a,a)?(i.mode=fe,z):(i.havedict=1,S):Z},i.inflateInfo="pako inflate (from Nodeca project)"},{"../utils/common":1,"./adler32":3,"./crc32":5,"./inffast":7,"./inftrees":9}],9:[function(e,t,i){"use strict";var n=e("../utils/common"),a=[3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0],r=[16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,72,78],o=[1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0],s=[16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64];t.exports=function(e,t,i,f,l,d,u,c){var h,b,w,m,k,_,g,v,p,x=c.bits,y=0,S=0,E=0,B=0,Z=0,A=0,z=0,R=0,N=0,O=0,C=null,I=0,T=new n.Buf16(16),U=new n.Buf16(16),D=null,F=0;for(y=0;y<=15;y++)T[y]=0;for(S=0;S<f;S++)T[t[i+S]]++;for(Z=x,B=15;B>=1&&0===T[B];B--);if(Z>B&&(Z=B),0===B)return l[d++]=20971520,l[d++]=20971520,c.bits=1,0;for(E=1;E<B&&0===T[E];E++);for(Z<E&&(Z=E),R=1,y=1;y<=15;y++)if(R<<=1,(R-=T[y])<0)return-1;if(R>0&&(0===e||1!==B))return-1;for(U[1]=0,y=1;y<15;y++)U[y+1]=U[y]+T[y];for(S=0;S<f;S++)0!==t[i+S]&&(u[U[t[i+S]]++]=S);if(0===e?(C=D=u,_=19):1===e?(C=a,I-=257,D=r,F-=257,_=256):(C=o,D=s,_=-1),O=0,S=0,y=E,k=d,A=Z,z=0,w=-1,N=1<<Z,m=N-1,1===e&&N>852||2===e&&N>592)return 1;for(;;){g=y-z,u[S]<_?(v=0,p=u[S]):u[S]>_?(v=D[F+u[S]],p=C[I+u[S]]):(v=96,p=0),h=1<<y-z,E=b=1<<A;do{l[k+(O>>z)+(b-=h)]=g<<24|v<<16|p|0}while(0!==b);for(h=1<<y-1;O&h;)h>>=1;if(0!==h?(O&=h-1,O+=h):O=0,S++,0==--T[y]){if(y===B)break;y=t[i+u[S]]}if(y>Z&&(O&m)!==w){for(0===z&&(z=Z),k+=E,R=1<<(A=y-z);A+z<B&&!((R-=T[A+z])<=0);)A++,R<<=1;if(N+=1<<A,1===e&&N>852||2===e&&N>592)return 1;l[w=O&m]=Z<<24|A<<16|k-d|0}}return 0!==O&&(l[k+O]=y-z<<24|64<<16|0),c.bits=Z,0}},{"../utils/common":1}],10:[function(e,t,i){"use strict";t.exports={2:"need dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"}},{}],11:[function(e,t,i){"use strict";t.exports=function(){this.input=null,this.next_in=0,this.avail_in=0,this.total_in=0,this.output=null,this.next_out=0,this.avail_out=0,this.total_out=0,this.msg="",this.state=null,this.data_type=2,this.adler=0}},{}],"/lib/inflate.js":[function(e,t,i){"use strict";function n(e){if(!(this instanceof n))return new n(e);this.options=o.assign({chunkSize:16384,windowBits:0,to:""},e||{});var t=this.options;t.raw&&t.windowBits>=0&&t.windowBits<16&&(t.windowBits=-t.windowBits,0===t.windowBits&&(t.windowBits=-15)),!(t.windowBits>=0&&t.windowBits<16)||e&&e.windowBits||(t.windowBits+=32),t.windowBits>15&&t.windowBits<48&&0==(15&t.windowBits)&&(t.windowBits|=15),this.err=0,this.msg="",this.ended=!1,this.chunks=[],this.strm=new d,this.strm.avail_out=0;var i=r.inflateInit2(this.strm,t.windowBits);if(i!==f.Z_OK)throw new Error(l[i]);this.header=new u,r.inflateGetHeader(this.strm,this.header)}function a(e,t){var i=new n(t);if(i.push(e,!0),i.err)throw i.msg||l[i.err];return i.result}var r=e("./zlib/inflate"),o=e("./utils/common"),s=e("./utils/strings"),f=e("./zlib/constants"),l=e("./zlib/messages"),d=e("./zlib/zstream"),u=e("./zlib/gzheader"),c=Object.prototype.toString;n.prototype.push=function(e,t){var i,n,a,l,d,u,h=this.strm,b=this.options.chunkSize,w=this.options.dictionary,m=!1;if(this.ended)return!1;n=t===~~t?t:!0===t?f.Z_FINISH:f.Z_NO_FLUSH,"string"==typeof e?h.input=s.binstring2buf(e):"[object ArrayBuffer]"===c.call(e)?h.input=new Uint8Array(e):h.input=e,h.next_in=0,h.avail_in=h.input.length;do{if(0===h.avail_out&&(h.output=new o.Buf8(b),h.next_out=0,h.avail_out=b),(i=r.inflate(h,f.Z_NO_FLUSH))===f.Z_NEED_DICT&&w&&(u="string"==typeof w?s.string2buf(w):"[object ArrayBuffer]"===c.call(w)?new Uint8Array(w):w,i=r.inflateSetDictionary(this.strm,u)),i===f.Z_BUF_ERROR&&!0===m&&(i=f.Z_OK,m=!1),i!==f.Z_STREAM_END&&i!==f.Z_OK)return this.onEnd(i),this.ended=!0,!1;h.next_out&&(0!==h.avail_out&&i!==f.Z_STREAM_END&&(0!==h.avail_in||n!==f.Z_FINISH&&n!==f.Z_SYNC_FLUSH)||("string"===this.options.to?(a=s.utf8border(h.output,h.next_out),l=h.next_out-a,d=s.buf2string(h.output,a),h.next_out=l,h.avail_out=b-l,l&&o.arraySet(h.output,h.output,a,l,0),this.onData(d)):this.onData(o.shrinkBuf(h.output,h.next_out)))),0===h.avail_in&&0===h.avail_out&&(m=!0)}while((h.avail_in>0||0===h.avail_out)&&i!==f.Z_STREAM_END);return i===f.Z_STREAM_END&&(n=f.Z_FINISH),n===f.Z_FINISH?(i=r.inflateEnd(this.strm),this.onEnd(i),this.ended=!0,i===f.Z_OK):n!==f.Z_SYNC_FLUSH||(this.onEnd(f.Z_OK),h.avail_out=0,!0)},n.prototype.onData=function(e){this.chunks.push(e)},n.prototype.onEnd=function(e){e===f.Z_OK&&("string"===this.options.to?this.result=this.chunks.join(""):this.result=o.flattenChunks(this.chunks)),this.chunks=[],this.err=e,this.msg=this.strm.msg},i.Inflate=n,i.inflate=a,i.inflateRaw=function(e,t){return t=t||{},t.raw=!0,a(e,t)},i.ungzip=a},{"./utils/common":1,"./utils/strings":2,"./zlib/constants":4,"./zlib/gzheader":6,"./zlib/inflate":8,"./zlib/messages":10,"./zlib/zstream":11}]},{},[])("/lib/inflate.js")});</script>
EOF
)
inflate=$(echo $inflate | sed -e 's/[\/&]/\\&/g')

find="<script type=\"text/javascript\" src=\"$game.js\"></script>"
replace="$inflate<script type=\"text/javascript\" src=\"$game.js\"></script>"
if grep -q "'$game.js'" "$f"; then
    echo "using 3.1 version"
    find="<script type='text/javascript' src='$game.js'></script>"
    replace="$inflate<script type='text/javascript' src='$game.js'></script>"
fi    

if [[ "$OSTYPE" = *"linux"* ]]; then
SED="sed -i\"\""
else
SED="sed -i \"\""
fi

echo "placing paco inside $f..."
$SED -e "s@$find@$replace@" "$f"

echo "modifying $game.js to load gziped files..."
find="function loadXHR(resolve, reject, file, tracker) {"
replace=$(cat <<\EOF
    function loadXHR(resolve, reject, file, tracker) {  if (file.substr(-5) === '.wasm' || file.substr(-4) === '.pck') { file += '.gz'; var resolve_orig = resolve; resolve = function(xhr) { return resolve_orig(xhr.responseURL.substr(-3) === '.gz' ? { response: pako.inflate(xhr.response),    responseType: xhr.responseType, responseURL: xhr.responseURL, status: xhr.status,   statusText: xhr.statusText } : xhr); }; }
EOF
)

$SED -e "s@$find@$replace@" "$game.js"

Thanks a lot man !

Wow! Really works!
Thank you very much.
From 20,6 to 5,4 Mb or from 2:52 min to 0:45 min to load (even in a slow 1 mbps internet).

I added some changes you might consider implementing:
https://gist.github.com/hanfil/114f295a4825f44def7f63b2eedd9f08/revisions
Just some small improvement. Minimizing html and javascript file.

Lots of codes in the js file has been changed in 3.2.4rc. XHR load functions have been omitted. Is it still possible to compress files in the new version?

I'd recommend configuring your web server to serve precompressed Brotli files instead of using this script. This way, you don't have to modify the HTML and JavaScript files.

Here's an example for Apache: https://gist.github.com/Calinou/fc0fe1003c95380054f0084f9476e476

Since all web browsers that can run Godot support Brotli, there's also no point in creating precompressed gzip files anymore. Brotli at level 11 is often 10-15% smaller than gzip at level 9 🙂

If you host your project on GitHub Pages, the HTML/CSS/JavaScript/WASM files will use on-the-fly gzip compression which still helps decrease the download size significantly. The PCK file won't use on-the-fly compression though. Unfortunately, itch.io doesn't use on-the-fly compression for WASM files.

@Calinou Hi. This script compress 12 mb wasm to 3 mb wasm.gz. Can you tell me how you can make it work in version 3.3? Thanks!

@Calinou Hi. This script compress 12 mb wasm to 3 mb wasm.gz. Can you tell me how you can make it work in version 3.3? Thanks!

You can get on-the-fly compression to work with any Godot version by configuring the web server, or using a host that enables gzip/Brotli compression for WebAssembly files. I've explained everything in the above comment 🙂

The nice thing about on-the-fly compression is that you don't need to modify any logic to use it. On top of that, you't don't have to use a slow gzip/Brotli implementation since you can can rely on the browser's native implementation.

@Calinou Hi. This script compress 12 mb wasm to 3 mb wasm.gz. Can you tell me how you can make it work in version 3.3? Thanks!
@DarkMessiah
see my game_library.[https://github.com/Atem1995/game_library/blob/main/dodge_the_creeps/dodge_the_creeps.js]
1、add pako_*_.js to the *.html file
2、gzip the *.wasm and *.pck.
first, change the 'loadFetch' function:

function loadFetch(file, tracker, fileSize, raw) {
	var p_file = file

	tracker[file] = {
		total: fileSize || 0,
		loaded: 0,
		done: false,
	};

	if (file.endsWith(".wasm") || file.endsWith(".pck")) {
		file += ".gz"
	}

	return fetch(file).then(function (response) {
		if (!response.ok) {
			return Promise.reject(new Error(`Failed loading file '${file}'`));
		}

		const tr = getTrackedResponse(response, tracker[p_file]);
		return Promise.resolve(tr.arrayBuffer().then( buffer => {
			return new Response(pako.inflate(buffer), { headers: tr.headers }) 
		}))
		
	});
}

and then change 'this.preload' for ".pck" loaded:

this.preload = function (pathOrBuffer, destPath, fileSize) {
	let buffer = null;
	if (typeof pathOrBuffer === 'string') {
		const me = this;
		return this.loadPromise(pathOrBuffer, fileSize).then(function (buf) {
			buf.arrayBuffer().then(data => {
				me.preloadedFiles.push({
					path: destPath || pathOrBuffer,
					buffer: data,
				});
			})
			return Promise.resolve();
		});
	} else if (pathOrBuffer instanceof ArrayBuffer) {
		buffer = new Uint8Array(pathOrBuffer);
	} else if (ArrayBuffer.isView(pathOrBuffer)) {
		buffer = new Uint8Array(pathOrBuffer.buffer);
	}
	if (buffer) {
		this.preloadedFiles.push({
			path: destPath,
			buffer: pathOrBuffer,
		});
		return Promise.resolve();
	}
	return Promise.reject(new Error('Invalid object for preloading'));
};

@Atem1995 thanks for your code, the game is loading in local.
The problem is that when I upload it on a server I get this while loading: incorrect header check

Any thoughts?

Thanks in advance,
Alessandro

https://github.com/Atem1995/game_library See my game_library's issues.maybe the same problem.

…

---Original--- From: ***@***.***> Date: Tue, May 17, 2022 23:22 PM To: ***@***.***>; Cc: ***@***.******@***.***>; Subject: Re: natrim/convert.sh @havana24 commented on this gist. @Atem1995 thanks for your code, the game is loading in local. The problem is that when I upload it on a server I get this while loading: incorrect header check Any thoughts? Thanks in advance, Alessandro — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>

Yeah i seem to receive the same header check issue, did you ever find a solution?
@Atem1995

I revised the original script with @Atem1995 's revisions
https://gist.github.com/threethan/37df33ff775e00cc17670e41c074def8

@Calinou Hi. This script compress 12 mb wasm to 3 mb wasm.gz. Can you tell me how you can make it work in version 3.3? Thanks!
@DarkMessiah
see my game_library.[https://github.com/Atem1995/game_library/blob/main/dodge_the_creeps/dodge_the_creeps.js]
1、add pako_*_.js to the *.html file
2、gzip the *.wasm and *.pck.
first, change the 'loadFetch' function:

function loadFetch(file, tracker, fileSize, raw) {
	var p_file = file

	tracker[file] = {
		total: fileSize || 0,
		loaded: 0,
		done: false,
	};

	if (file.endsWith(".wasm") || file.endsWith(".pck")) {
		file += ".gz"
	}

	return fetch(file).then(function (response) {
		if (!response.ok) {
			return Promise.reject(new Error(`Failed loading file '${file}'`));
		}

		const tr = getTrackedResponse(response, tracker[p_file]);
		return Promise.resolve(tr.arrayBuffer().then( buffer => {
			return new Response(pako.inflate(buffer), { headers: tr.headers }) 
		}))
		
	});
}

and then change 'this.preload' for ".pck" loaded:

this.preload = function (pathOrBuffer, destPath, fileSize) {
	let buffer = null;
	if (typeof pathOrBuffer === 'string') {
		const me = this;
		return this.loadPromise(pathOrBuffer, fileSize).then(function (buf) {
			buf.arrayBuffer().then(data => {
				me.preloadedFiles.push({
					path: destPath || pathOrBuffer,
					buffer: data,
				});
			})
			return Promise.resolve();
		});
	} else if (pathOrBuffer instanceof ArrayBuffer) {
		buffer = new Uint8Array(pathOrBuffer);
	} else if (ArrayBuffer.isView(pathOrBuffer)) {
		buffer = new Uint8Array(pathOrBuffer.buffer);
	}
	if (buffer) {
		this.preloadedFiles.push({
			path: destPath,
			buffer: pathOrBuffer,
		});
		return Promise.resolve();
	}
	return Promise.reject(new Error('Invalid object for preloading'));
};

can we use it for 7z compression instead of gzip
if yes please give me the steps

can we use it for 7z compression instead of gzip

No, as web browsers only support gzip and Brotli compression. The 7Z format uses LZMA2 compression.

Thank you, but the gzip size i getting larger for my .wasm it nears 38MB I want it to get it around 18-20MB
for in work and the original size of my .wasm is 131MB can you help to reduce it?

can we use it for 7z compression instead of gzip

No, as web browsers only support gzip and Brotli compression. The 7Z format uses LZMA2 compression.

But the compression of 7z is getting less than the gzip size how to use it for loading and preloading the .wasm and .pck with a .7z extension can help with this, please?

Sir, please give me a reply on how to use it
and how to compress the file up to 20 MB from 131MB for Gzip file compression.

Is there any one to solve my problem?

@havana24 @Atem1995
About `incorrect header check error:
I solved this error and upload my game at CrazyGames QATool and works ok:
1- Comment or remove this lines:

// if (file.endsWith(".wasm") || file.endsWith(".pck")) {
//		file += ".gz"
//	}

2- Rename Gzipped .wasm and .pck files and remove .gz extension.
And now my game runs ok on both local and remote servers.