libmount/dist/libmount.min.mjs

Standalone FAT12, FAT16, FAT32, VFAT implementation in JavaScript

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class zb{constructor(a,b,c,d,e){this.j=a;this.bs=b;this.m=e;this.g=c;this.root=new gb(this,"/",Oa);this.h=d}getName(){return"FAT"+this.g.T}getLabel(){return wb(this)?.pa??this.m.decode(this.bs.Wa).trimEnd()}setLabel(a){var b=wb(this);if(a){var c=this.m;const d=(new Uint8Array(11)).fill(32);a&&d.set(c.encode(a.substring(0,11)).subarray(0,11));a=Ka(d);(b=b?.P??xb(this,Oa,1))&&T(this.j,b,a)}else b&&ob(this,b)}getOEMName(){return this.m.decode(this.bs.Ua).trimEnd()}getId(){return this.bs.Va}getSizeOfCluster(){return this.g.ca}getCountOfClusters(){return this.g.fa}getFreeClusters(){let a=
0;for(let b=2;b<=this.g.U;b++)this.h.g(b)===0&&a++;return a}getRoot(){return this.root}};class Ab{constructor(a,b){this.g=a;this.h=b}capacity(){return this.g.g.capacity}getFileSystem(){a:{var a=this.g,b=this.h;if(a.g.capacity<512)var c=null;else{try{var d=a.g.read(0,512),e=new O(d);P(e.g.length>=512);z(e,0);const B=D(e,3),M=D(e,8),q={I:H(e),$:G(e),Y:H(e),V:G(e),Ca:H(e),Oa:H(e),ua:G(e),ga:H(e),Ea:H(e),ya:H(e),eb:e.o(),Pa:e.o(),Ka:-1,Sa:-1,Ta:-1,Aa:-1,ta:-1,Ia:-1};P([512,1024,2048,4096].includes(q.I));P([1,2,4,8,16,32,64,128].includes(q.$));P(q.Y>0);P(q.V>0);P((q.Ca<<5)%q.I===0);P(q.Ca===
0||q.ga>0);P(q.Oa>0||q.Pa>65535);q.ga===0&&(q.Ka=e.o(),q.Sa=H(e),q.Ta=H(e),q.Aa=e.o(),q.ta=H(e),q.Ia=H(e),A(e,12),P(q.Aa>=2),P(q.Ia>=0),P(q.ta>0));var f={hb:B,Ua:M,v:q,bb:G(e),fb:G(e),$a:G(e),Va:e.o(),Wa:D(e,11),cb:D(e,8),Za:D(e,510-e.i)};const r=f.v;var g=r.ga===0;const C=r.I,E=r.$;var h=r.Y;const w=r.V,J=r.Ca;var k=r.Oa;const Q=r.ga;var m=r.Pa;const ka=r.Ka,R=r.Aa,V=g?0:Math.ceil((J<<5)/C);e=g?ka:Q;k=k?k:m;m=k-(h+e*w+V);const W=Math.floor(m/E);d=g?32:W<4087?12:16;h+=e*w;var l={ba:e,ma:k,ab:m,ca:C*
E,fa:W,T:d,U:W+1,ia:h+V,ka:C*(h+(g?(R-2)*E:0)),ha:(1<<Math.min(28,d))-1};const N=Array(f.v.V);for(g=0;g<f.v.V;g++)N[g]=(f.v.Y+g*l.ba)*f.v.I;let X;if(l.T===12)X=new Ua(a,l,N);else if(l.T===16)X=new Va(a,N);else if(l.T===32){const la=f.v.I*f.v.ta;g=la+492;var n=a.g.read(la,512);var p=new O(n);const ma=p.o(),Y=A(p,480).o();p.o();p.o();const F=A(p,12).o();P(ma===1096897106&&Y===1631679090&&F===2857697280);X=new Wa(a,l,N,g)}else throw new ca;c=new zb(a,f,l,X,b);break a}catch(B){if(B.name==="ValidationError"){c=
null;break a}throw B;}c=void 0}}return c}getPartitions(){if(this.g.g.capacity<512)return[];var a=this.g.g.read(0,512);a=new O(a);try{return Ga(a).map(({ea:b,la:c,za:d,na:e})=>({active:b===128,type:c,relativeSectors:d,totalSectors:e}))}catch(b){if(b.name==="ValidationError")return[];throw b;}}write(a){const b=this.g,c=a.bytsPerSec,d=a.zeroRegions;a=a.dataSectors;for(const {i:e,count:f}of d)y(b,c*e,(new Uint8Array(c*f)).fill(0));for(const {i:e,data:f}of a)y(b,c*e,f)}};const Bb=a=>({capacity:a.length,read:(b,c)=>a.slice(b,b+c),write:(b,c)=>a.set(c,b)}),Cb=(a,b)=>{const c=a.relativeSectors*512,d=b.read,e=b.write;a={capacity:a.totalSectors*512,read:(f,g)=>d(c+f,g)};e&&(a.write=(f,g)=>e(c+f,g));return a};const Db=t("LIBMNTJS"),Eb=t("Non-system disk or disk error\r\nreplace and strike any key when ready\r\n"),Fb=t("NO NAME    "),Gb=new Map([[160,[254,40,1,8,0,1,4]],[180,[252,40,1,9,0,2,4]],[320,[255,40,2,8,1,1,7]],[360,[253,40,2,9,1,2,7]],[720,[249,80,2,9,1,3,7]],[1200,[249,80,2,15,0,7,14]],[1440,[240,80,2,18,0,9,14]],[2880,[240,80,2,36,1,9,15]]]),Z=(a,b,c,d)=>Number.isInteger(d)&&(d=Number(d),d>=a&&d<=b)?d:c,Hb=(a,b)=>{a+=2;let c=12;b===32?c-=5:b===16?c-=4:(a*=3,c-=2);return(a>>>c)+((a&(1<<c)-1)===
0?0:1)},Ib=(a,b)=>{var c=Number.MAX_SAFE_INTEGER;c=a=Z(0,c,c,a);var d=b?.type,e=32;d==="FAT12"?e=12:d==="FAT16"?e=16:d==="FAT32"?e=32:c<=4194304?e=12:c<536870912&&(e=16);c=e;d=Math.min(4294967295,Math.floor(a/512));a=b?.numFATs===1?1:2;e=0;let f=32;c!==32&&(e=Z(1,512,512,b?.rootEntCnt),e=(e>>4)+((e&15)===0?0:1),f=1);var g=1,h=268435438;c===12?(g=0,h=4078):c===16&&(g=4087,h=65518);var k=d-f-e;if(k<a)return null;var m=Z(0,16,16,b?.compat);g+=m;h-=m;a:{m=h;b=b?.secPerClus;if(Number.isInteger(b)&&(b=
[1,2,4,8,16,32,64,128].indexOf(Number(b)),b>=0))break a;if(c===32)b=d<=532480?0:3;else{b=Hb(m,c);b=k-a*b;for(var l=0;l<6&&m<b;)l++,m*=2;b=l}}l=1<<b;m=Math.ceil((k+(1<<b+1))/((1<<b+9+3)/c+a));k=Math.floor((k-m*a)/l);if(k<g)return null;k>h&&(k=h);m=Hb(k,c);var n=f+m*a+e;h=d-(n+k*l);n%=l;n=n===0?0:l-n;let p=0;if(n>h){k--;h+=l;if(k<g)return null;g=Hb(k,c);p=(m-g)*a;m=g}d-=h-n;return{T:c,qa:9,Da:b,Y:f+(n+p),V:a,Ba:e,ba:m,ma:d,fa:k,ua:248,ya:255,Ea:63}};ns.fdisk=a=>{const b=new Uint8Array(512);Ha(new O(b),a.map(({active:c,type:d,relativeSectors:e,totalSectors:f})=>{const g={sa:0,La:0,Ma:0};return{ea:c?128:0,Na:g,la:d,Ja:g,za:e,na:f}}));return{bytsPerSec:512,zeroRegions:[],dataSectors:[{i:0,data:b}]}};
ns.mkfsvfat=(a,b)=>{var c=Gb.get(a/1024);if(c){const [Jb,Kb,Ya,Za,$a,ab,bb]=c;a=Kb*Ya*Za;a={T:12,qa:9,Da:$a,Y:1,V:2,Ba:bb,ba:ab,ma:a,fa:a-(1+ab*2+bb)>>$a,ua:Jb,ya:Ya,Ea:Za}}else a=Ib(a,b);var d=a;if(!d)return null;a=d.T;c=d.qa;const e=d.Da,f=d.Y,g=d.V,h=d.Ba,k=d.ba,m=d.ma,l=d.fa;var n=d.T,p=d.qa,B=d.Da,M=d.Y,q=d.V,r=d.ba,C=d.ma,E=n===32,w=E?420:448;const J=1<<p;p=d.Ba<<p-5;var Q=new Uint8Array(3),ka=(new Uint8Array(8)).fill(32),R=new Date;B=1<<B;var V=C>65535?0:C,W=Z(0,255,d.ua,b?.media),N=E?0:r,
X=Z(0,65535,d.Ea,b?.secPerTrk);d=Z(0,65535,d.ya,b?.numHeads);var la=Z(0,4294967295,0,b?.hiddSec),ma=C>65535?C:0;C=Z(0,4294967295,(v(R)<<16|x(R))>>>0,b?.id);R=(new Uint8Array(8)).fill(32);var Y=new Uint8Array(w);ka.set((b?.oemName??Db).subarray(0,8));R.set(t("FAT"+n));if((n=b?.bs)&&n.length>=512)Q.set(n.subarray(0,3)),Y.set(n.subarray(510-w,510));else{n=wa;var F=ya;w=510-w;E&&(n=xa,F=za);Q.set(n);Y.set(F);Y.set((b?.message??Eb).subarray(0,509-w-F.length),F.length)}F=(n=a===32)?r:N;w=M+F*q+(n?0:Math.ceil((p<<
5)/J));const Lb=Math.floor(((V?V:ma)-w)/B);E=[];E.push({i:0,count:w+(n?B:0)});w=[];const Ca=new Uint8Array(J);var na=new O(Ca);z(na,0);const Mb=N===0;L(L(L(K(L(L(K(L(K(L(I(I(na,Q),ka),J),B),M),q),p),V),W),N),X),d).u(la).u(ma);Mb&&A(L(L(L(L(na.u(r),0),0).u(2),1),6),12);L(I(I(I(K(K(K(na,0),0),41).u(C),Fb),R),Y),43605);w.push({i:0,data:Ca});r=new Uint8Array(J);r[0]=W;for(p=0;p<a/4-1;p++)r[p+1]=255;n&&(r[8]=255,r[9]=255,r[10]=255,r[11]=15,p=new Uint8Array(J),Q=Lb-1,Da(Da((new O(p)).u(1096897106),480).u(1631679090).u(Q).u(2),
12).u(2857697280),w.push({i:1,data:p}),w.push({i:6,data:Ca}),w.push({i:7,data:p}));for(p=0;p<q;p++)w.push({i:M+p*F,data:r});b?.label&&(r=new Uint8Array(J),M=M+F*q+(n?0*B:0),q=(new Uint8Array(11)).fill(32),q.set(b.label.subarray(0,11)),Ja(new O(r),0,Ka(q)),w.push({i:M,data:r}));return{sectors:{bytsPerSec:J,zeroRegions:E,dataSectors:w},id:C,type:"FAT"+a,totSec:m,rsvdSecCnt:f,numFATs:g,fatSz:k,rootDirSectors:h,countOfClusters:l,secPerClus:1<<e,bytsPerSec:1<<c}};
ns.mount=(a,b)=>{a instanceof Uint8Array&&(a=Bb(a));const c=b?.partition;c&&(a=Cb(c,a));return new Ab(new Ba(a),b?.codepage??ba)};
export const { fdisk, mkfsvfat, mount } = ns;