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Thread: compress / decompresss gzip encoded json

  1. #1
    Join Date
    Dec 2012
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    4

    compress / decompresss gzip encoded json

    Hi,

    In my application, I receive large JSON files from an AJAX request. To optimize that I want to compress the files using gzip.

    Is there any library that supports decompressing / compressing of gzip files in the browser?

    Does anyone have a better idea to optimize the amount of data to transmit?


    Thank you very much for your help!

  2. #2
    Join Date
    Dec 2012
    Posts
    3
    I think you can set the server to gzip certain requests automatically. If your browser supports them, it'll 'unzip' automatically.

    It's a .htaccess feature if you're running on Apache. Try Googling that.

    Other than trying to reduce the amount of data needed, not sure how you could optimize any further. Perhaps break the request into multiple smaller ones (i.e. pagination)?

  3. #3
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    Dec 2012
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    4
    Quote Originally Posted by CrackyD View Post
    I think you can set the server to gzip certain requests automatically. If your browser supports them, it'll 'unzip' automatically.

    It's a .htaccess feature if you're running on Apache. Try Googling that.

    Other than trying to reduce the amount of data needed, not sure how you could optimize any further. Perhaps break the request into multiple smaller ones (i.e. pagination)?
    Thanks a lot for your hint :-) Thats exactly the thing I need.... hopefully it works on mobile device browsers as well.

    to any other interested users: there you can find a good explanation about how automatic gzip compression works http://betterexplained.com/articles/...p-compression/

  4. #4
    Join Date
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    Versailles, France
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    1,272
    Json has qualities, but is not always the best solution to transfer data...

    In the case of a mySQL table, for example, simple strings (with | separators and a number N of fields - in the file name before the suffix ?) can be useful to read the keys (the N first fields) and all the values (the N-following fields...). This avoid the useless repetitions of the keys !
    Last edited by 007Julien; 12-03-2012 at 09:55 AM.

  5. #5
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    Jul 2008
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    urbana, il
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    2,787
    Quote Originally Posted by projs1 View Post
    Hi,

    In my application, I receive large JSON files from an AJAX request. To optimize that I want to compress the files using gzip.

    Is there any library that supports decompressing / compressing of gzip files in the browser?


    Thank you very much for your help!
    Code:
    /* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
     * Version: 1.0.1
     * LastModified: Dec 25 1999.
     * updated and compressed by dandavis, 2012 (attribution only derivative)
     * Presumed abandonware, but retain this notice for public use.
     */
    
    // 5kb:
    var inflate=function(){function U(){this[J]=this[R]=null}function V(){this.n=this.b=this.e=0,this.t=null}function K(h,v,u,b,a,p){this[D]=16,this.N_MAX=288,this[z]=0,this[C]=null,this.m=0;var q=B(this[D]+1),m,c,l,g,d,e,f,i=B(this[D]+1),j,k,A,w=new V,r=B(this[D]);g=B(this.N_MAX);var x,s=B(this[D]+1),n,t,y;y=this[C]=null;for(d=0;d<q[E];d++)q[d]=0;for(d=0;d<i[E];d++)i[d]=0;for(d=0;d<r[E];d++)r[d]=null;for(d=0;d<g[E];d++)g[d]=0;for(d=0;d<s[E];d++)s[d]=0;m=256<v?h[256]:this[D],j=h,k=0,d=v;do q[j[k]]++,k++;while(0<--d);if(q[0]==v)this[C]=null,this[z]=this.m=0;else{for(e=1;e<=this[D]&&0==q[e];e++);f=e,p<e&&(p=e);for(d=this[D];0!=d&&0==q[d];d--);l=d,p>d&&(p=d);for(n=1<<e;e<d;e++,n<<=1)if(0>(n-=q[e])){this[z]=2,this.m=p;return}if(0>(n-=q[d]))this[z]=2,this.m=p;else{q[d]+=n,s[1]=e=0,j=q,k=1;for(A=2;0<--d;)s[A++]=e+=j[k++];j=h,d=k=0;do 0!=(e=j[k++])&&(g[s[e]++]=d);while(++d<v);v=s[l],s[0]=d=0,j=g,k=0,g=-1,x=i[0]=0,A=null;for(t=0;f<=l;f++)for(h=q[f];0<h--;){for(;f>x+i[1+g];){x+=i[1+g],g++,t=(t=l-x)>p?p:t;if((c=1<<(e=f-x))>h+1){c-=h+1;for(A=f;++e<t&&!((c<<=1)<=q[++A]);)c-=q[A]}x+e>m&&x<m&&(e=m-x),t=1<<e,i[1+g]=e,A=B(t);for(c=0;c<t;c++)A[c]=new V;null==y?y=this[C]=new U:y=y[R]=new U,y[R]=null,y[J]=A,r[g]=A,0<g&&(s[g]=d,w.b=i[g],w.e=16+e,w.t=A,e=(d&(1<<x)-1)>>x-i[g],r[g-1][e].e=w.e,r[g-1][e].b=w.b,r[g-1][e].n=w.n,r[g-1][e].t=w.t)}w.b=f-x,k>=v?w.e=99:j[k]<u?(w.e=256>j[k]?16:15,w.n=j[k++]):(w.e=a[j[k]-u],w.n=b[j[k++]-u]),c=1<<f-x;for(e=d>>x;e<t;e+=c)A[e].e=w.e,A[e].b=w.b,A[e].n=w.n,A[e].t=w.t;for(e=1<<f-1;0!=(d&e);e>>=1)d^=e;for(d^=e;(d&(1<<x)-1)!=s[g];)x-=i[g],g--}this.m=i[1],this[z]=0!=n&&1!=l?1:0}}}function f(h){for(;y<h;)H|=(M[E]==S?-1:M.charCodeAt(S++)&255)<<y,y+=8}function i(h){return H&ba[h]}function l(h){H>>=h,y-=h}function N(h,v,u){var b,a,p;if(0==u)return 0;for(p=0;;){f(r),a=s[J][i(r)];for(b=a.e;16<b;){if(99==b)return-1;l(a.b),b-=16,f(b),a=a.t[i(b)],b=a.e}l(a.b);if(16==b)j&=F-1,h[v+p++]=n[j++]=a.n;else{if(15==b)break;f(b),k=a.n+i(b),l(b),f(I),a=T[J][i(I)];for(b=a.e;16<b;){if(99==b)return-1;l(a.b),b-=16,f(b),a=a.t[i(b)],b=a.e}l(a.b),f(b),G=j-a.n-i(b);for(l(b);0<k&&p<u;)k--,G&=F-1,j&=F-1,h[v+p++]=n[j++]=n[G++]}if(p==u)return u}return t=-1,p}function ca(h,j,k){var b,a,p,q,m,c,n,g=B(316);for(b=0;b<g[E];b++)g[b]=0;f(5),c=257+i(5),l(5),f(5),n=1+i(5),l(5),f(4),b=4+i(4),l(4);if(286<c||30<n)return-1;for(a=0;a<b;a++)f(3),g[W[a]]=i(3),l(3);for(;19>a;a++)g[W[a]]=0;r=7,a=new K(g,19,19,null,null,r);if(0!=a[z])return-1;s=a[C],r=a.m,q=c+n;for(b=p=0;b<q;)if(f(r),m=s[J][i(r)],a=m.b,l(a),a=m.n,16>a)g[b++]=p=a;else if(16==a){f(2),a=3+i(2),l(2);if(b+a>q)return-1;for(;0<a--;)g[b++]=p}else{17==a?(f(3),a=3+i(3),l(3)):(f(7),a=11+i(7),l(7));if(b+a>q)return-1;for(;0<a--;)g[b++]=0;p=0}r=da,a=new K(g,c,257,X,Y,r),0==r&&(a[z]=1);if(0!=a[z])return 1==a[z],-1;s=a[C],r=a.m;for(b=0;b<n;b++)g[b]=g[b+c];return I=ea,a=new K(g,n,0,Z,$,I),T=a[C],I=a.m,0==I&&257<c?-1:(1==a[z],0!=a[z]?-1:N(h,j,k))}function fa(h,v,u){var b,a;for(b=0;b<u&&(!L||-1!=t);){if(0<k){if(t!=ga)for(;0<k&&b<u;)k--,G&=F-1,j&=F-1,h[v+b++]=n[j++]=n[G++];else{for(;0<k&&b<u;)k--,j&=F-1,f(8),h[v+b++]=n[j++]=i(8),l(8);0==k&&(t=-1)}if(b==u)break}if(-1==t){if(L)break;f(1),0!=i(1)&&(L=!0),l(1),f(2),t=i(2),l(2),s=null,k=0}switch(t){case 0:a=h;var p=v+b,q=u-b,m=void 0,m=y&7;l(m),f(16),m=i(16),l(16),f(16);if(m!=(~H&65535))a=-1;else{l(16),k=m;for(m=0;0<k&&m<q;)k--,j&=F-1,f(8),a[p+m++]=n[j++]=i(8),l(8);a=(0==k&&(t=-1),m)}break;case 1:if(null!=s)a=N(h,v+b,u-b);else a:{a=h,p=v+b,q=u-b;if(null==O){for(var c=void 0,m=B(288),c=0;144>c;c++)m[c]=8;for(;256>c;c++)m[c]=9;for(;280>c;c++)m[c]=7;for(;288>c;c++)m[c]=8;P=7,c=new K(m,288,257,X,Y,P);if(0!=c[z]){a=(alert("HufBuild error: "+c[z]),-1);break a}O=c[C],P=c.m;for(c=0;30>c;c++)m[c]=5;Q=5,c=new K(m,30,0,Z,$,Q);if(1<c[z]){a=(O=null,alert("HufBuild error: "+c[z]),-1);break a}aa=c[C],Q=c.m}a=(s=O,T=aa,r=P,I=Q,N(a,p,q))}break;case 2:null!=s?a=N(h,v+b,u-b):a=ca(h,v+b,u-b);break;default:a=-1}if(-1==a)return L?0:-1;b+=a}return b}var B=Array,z="status",E="length",C="root",D="BMAX",J="list",R="next",Q,F=32768,ga=0,da=9,ea=6,n,j,O=null,aa,P,H,y,t,L,k,G,s,T,r,I,M,S,ba=[0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535],X=[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],Y=[0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,99,99],Z=[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],$=[0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13],W=[16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15];return window.inflate=function(h){var f,i,b;null==n&&(n=B(2*F)),y=H=j=0,t=-1,L=!1,k=G=0,s=null,M=h,S=0,f=B(1024);for(h="";0<(i=fa(f,0,f[E]));)for(b=0;b<i;b++)h+=String.fromCharCode(f[b]);return M=null,h}}();

  6. #6
    Join Date
    Jul 2008
    Location
    urbana, il
    Posts
    2,787

    (cont)

    Code:
    // 8kb:
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r=e.extra_base,n=e.max_code,u=e.max_length,a=e.static_tree,f,l,c,h,p=0;for(l=0;15>=l;l++)j[l]=0;o[F[q]].dl=0;for(e=q+1;573>e;e++)f=F[e],l=o[o[f].dl].dl+1,l>u&&(l=u,p++),o[f].dl=l,f>n||(j[l]++,c=0,f>=r&&(c=i[f-r]),h=o[f].fc,Y+=h*(l+c),null!=a&&(Z+=h*(a[f].dl+c)));if(0!=p){do{for(l=u-1;0==j[l];)l--;j[l]--,j[l+1]+=2,j[u]--,p-=2}while(0<p);for(l=u;0!=l;l--)for(f=j[l];0!=f;)i=F[--e],i>n||(o[i].dl!=l&&(Y+=(l-o[i].dl)*o[i].fc,o[i].fc=l),f--)}xt(t,s)},Nt=function(e,t){var n,r=-1,i,s=e[0].dl,o=0,u=7,a=4;0==s&&(u=138,a=3),e[t+1].dl=65535;for(n=0;n<=t;n++)i=s,s=e[n+1].dl,++o<u&&i==s||(o<a?D[i].fc+=o:0!=i?(i!=r&&D[i].fc++,D[16].fc++):10>=o?D[17].fc++:D[18].fc++,o=0,r=i,0==s?(u=138,a=3):i==s?(u=6,a=3):(u=7,a=4))},Ct=function(e,t){var n,r=-1,i,s=e[0].dl,o=0,u=7,a=4;0==s&&(u=138,a=3);for(n=0;n<=t;n++)if(i=s,s=e[n+1].dl,!(++o<u&&i==s)){if(o<a){do dt(i,D);while(0!=--o)}else 0!=i?(i!=r&&(dt(i,D),o--),dt(16,D),Ot(o-3,2)):10>=o?(dt(17,D),Ot(o-3,3)):(dt(18,D),Ot(o-11,7));o=0,r=i,0==s?(u=138,a=3):i==s?(u=6,a=3):(u=7,a=4)}},kt=function(e){var t,n,r;r=E-d,V[K]=Q,Tt(P),Tt(H);var i;Nt(A,P.max_code),Nt(O,H.max_code),Tt(B);for(i=18;3<=i&&0==D[ft[i]].dl;i--);i=(Y+=3*(i+1)+14,i),t=Y+3+7>>3,n=Z+3+7>>3,n<=t&&(t=n);if(r+4<=t&&0<=d){Ot(0+e,3),_t(),ht(r),ht(~r);for(i=0;i<r;i++)ct(a[d+i])}else if(n==t)Ot(2+e,3),At(M,_);else{Ot(4+e,3),r=P.max_code+1,t=H.max_code+1,i+=1,Ot(r-257,5),Ot(t-1,5),Ot(i-4,4);for(n=0;n<i;n++)Ot(D[ft[n]].dl,3);Ct(A,r-1),Ct(O,t-1),At(A,O)}Et(),0!=e&&_t()},Lt=function(e,t){l[$++]=t,0==e?A[t].fc++:(e--,A[U[t]+256+1].fc++,O[(256>e?z[e]:z[256+(e>>7)])&255].fc++,f[J++]=e,Q|=G),G<<=1,0==($&7)&&(V[K++]=Q,Q=0,G=1);if(2<k&&0==($&4095)){var n=8*$,r=E-d,i;for(i=0;30>i;i++)n+=O[i].fc*(5+ut[i]);n>>=3;if(J<parseInt($/2)&&n<parseInt(r/2))return!0}return 8191==$||8192==J},At=function(e,t){var n,r,i=0,s=0,o=0,u=0,a,c;if(0!=$)do 0==(i&7)&&(u=V[o++]),r=l[i++]&255,0==(u&1)?dt(r,e):(a=U[r],dt(a+256+1,e),c=ot[a],0!=c&&(r-=W[a],Ot(r,c)),n=f[s++],a=(256>n?z[n]:z[256+(n>>7)])&255,dt(a,t),c=ut[a],0!=c&&(n-=X[a],Ot(n,c))),u>>=1;while(i<$);dt(256,e)},Ot=function(e,t){p>16-t?(h|=e<<p,ht(h),h=e>>16-p,p+=t-16):(h|=e<<p,p+=t)},Mt=function(e,t){var n=0;do n|=e&1,e>>=1,n<<=1;while(0<--t);return n>>1},_t=function(){8<p?ht(h):0<p&&ct(h),p=h=0};return window.deflate=function(s,o){var u,h;et=s,tt=0,"undefined"==typeof o&&(o=6),(u=o)?1>u?u=1:9<u&&(u=9):u=6,k=u,x=r=!1;if(null==i){e=t=n=null,i=[8192],a=[65536],f=[8192],l=[32832],c=Array(65536),A=[573];for(u=0;573>u;u++)A[u]=new nt;O=[61];for(u=0;61>u;u++)O[u]=new nt;M=[288];for(u=0;288>u;u++)M[u]=new nt;_=[30];for(u=0;30>u;u++)_[u]=new nt;D=[39];for(u=0;39>u;u++)D[u]=new nt;P=new rt,H=new rt,B=new rt,j=[16],F=[573],R=[573],U=Array(256),z=[512],W=[29],X=[30],V=Array(1024)}for(var p=[1024],d=[];0<(u=bt(p,0,p.length));){var v=[u];for(h=0;h<u;h++)v[h]=String.fromCharCode(p[h]);d[d.length]=v.join("")}return et=null,d.join("")}}()

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