png-chunk-editor
Version:
NPM package to read and edit chunks contained in a PNG file
2 lines • 5.37 kB
JavaScript
;(()=>{var s=[137,80,78,71,13,10,26,10];function m(t){return t.slice(0,8).every((e,x)=>e===s[x])}var B=[0,1996959894,3993919788,2567524794,124634137,1886057615,3915621685,2657392035,249268274,2044508324,3772115230,2547177864,162941995,2125561021,3887607047,2428444049,498536548,1789927666,4089016648,2227061214,450548861,1843258603,4107580753,2211677639,325883990,1684777152,4251122042,2321926636,335633487,1661365465,4195302755,2366115317,997073096,1281953886,3579855332,2724688242,1006888145,1258607687,3524101629,2768942443,901097722,1119000684,3686517206,2898065728,853044451,1172266101,3705015759,2882616665,651767980,1373503546,3369554304,3218104598,565507253,1454621731,3485111705,3099436303,671266974,1594198024,3322730930,2970347812,795835527,1483230225,3244367275,3060149565,1994146192,31158534,2563907772,4023717930,1907459465,112637215,2680153253,3904427059,2013776290,251722036,2517215374,3775830040,2137656763,141376813,2439277719,3865271297,1802195444,476864866,2238001368,4066508878,1812370925,453092731,2181625025,4111451223,1706088902,314042704,2344532202,4240017532,1658658271,366619977,2362670323,4224994405,1303535960,984961486,2747007092,3569037538,1256170817,1037604311,2765210733,3554079995,1131014506,879679996,2909243462,3663771856,1141124467,855842277,2852801631,3708648649,1342533948,654459306,3188396048,3373015174,1466479909,544179635,3110523913,3462522015,1591671054,702138776,2966460450,3352799412,1504918807,783551873,3082640443,3233442989,3988292384,2596254646,62317068,1957810842,3939845945,2647816111,81470997,1943803523,3814918930,2489596804,225274430,2053790376,3826175755,2466906013,167816743,2097651377,4027552580,2265490386,503444072,1762050814,4150417245,2154129355,426522225,1852507879,4275313526,2312317920,282753626,1742555852,4189708143,2394877945,397917763,1622183637,3604390888,2714866558,953729732,1340076626,3518719985,2797360999,1068828381,1219638859,3624741850,2936675148,906185462,1090812512,3747672003,2825379669,829329135,1181335161,3412177804,3160834842,628085408,1382605366,3423369109,3138078467,570562233,1426400815,3317316542,2998733608,733239954,1555261956,3268935591,3050360625,752459403,1541320221,2607071920,3965973030,1969922972,40735498,2617837225,3943577151,1913087877,83908371,2512341634,3803740692,2075208622,213261112,2463272603,3855990285,2094854071,198958881,2262029012,4057260610,1759359992,534414190,2176718541,4139329115,1873836001,414664567,2282248934,4279200368,1711684554,285281116,2405801727,4167216745,1634467795,376229701,2685067896,3608007406,1308918612,956543938,2808555105,3495958263,1231636301,1047427035,2932959818,3654703836,1088359270,936918e3,2847714899,3736837829,1202900863,817233897,3183342108,3401237130,1404277552,615818150,3134207493,3453421203,1423857449,601450431,3009837614,3294710456,1567103746,711928724,3020668471,3272380065,1510334235,755167117];function i(t){let e=-1;for(let x=0;x<t.length;x++)e=e>>>8^B[(e^t[x])&255];return(e^-1)>>>0}function o(t){let e=0;for(let x=0;x<t.length;x++)e=e<<8|t[x]&255;return e}function u(t,e){if(!Number.isInteger(t))throw Error(`${t} is not integer.`);let x=[];for(;e>=1;)x[--e]=t&255,t>>=8;return x}function c(t){return t.map(e=>String.fromCharCode(e)).join("")}function a(t){let e=[];for(let x=0;x<t.length;x++){let d=t.charCodeAt(x);if(d>127)throw Error(`Invalid character in string "${t}" at position ${x}.`);e.push(d)}return e}function*p(t,e){let x=t.slice(8);for(;x.length>=12;){let d=f.fromBytes(x,e);yield d,x=x.slice(d.sizeTotal())}}var n=class{typeStr;typeBytes;constructor(e){if(e.length!==4)throw Error(`Invalid type "${e}". Must be 4 characters.`);let x=a(e);for(let d=0;d<x.length;d++){let r=x[d];if(!(r>64&&r<91||r>96&&r<123))throw Error(`Invalid character in type "${e}" at position ${d}.`)}this.typeStr=e,this.typeBytes=x}crc(){return i([...this.typeBytes,...this.dataBytes()])}sizeTotal(){return this.size()+12}toBytes(){return[...u(this.size(),4),...this.typeBytes,...this.dataBytes(),...u(this.crc(),4)]}into(e){if(this.typeStr!==e.typeStr)throw Error(`Invalid type ${this.typeStr} != ${e.typeStr}.`);return e.fromDataBytes(this.dataBytes())}},f=class t extends n{data;constructor(e,x){super(e),this.data=x}dataBytes(){return this.data}size(){return this.data.length}static fromBytes(e,x){let d=0,r=Math.max(o(e.slice(d,d+4)),0);d+=4;let b=e.slice(d,d+4),y=c(b);d+=4;let l=e.slice(d,d+r);if(d+=r,x!==!0){let k=o(e.slice(d,d+4))>>>0;if(d+=4,k!==i([...b,...l]))throw Error(`invalid CRC in chunk ${y}`)}return new t(y,l)}},h=class t extends n{static typeStr="tEXt";keyword;text;constructor(e,x){super(t.typeStr),this.keyword=e,this.text=x}dataBytes(){return[...a(this.keyword),0,...a(this.text)]}size(){return this.keyword.length+this.text.length+1}static fromDataBytes(e){let x=e.findIndex(b=>b===0);if(x===void 0)throw Error("Could not find separator byte.");let d=c(e.slice(0,x)),r=c(e.slice(x+1,e.length));return new t(d,r)}};var g=class t{chunks;constructor(e){this.chunks=e}insertChunk(e,x){x===void 0?this.chunks.push(e):this.chunks.splice(x,0,e)}getChunk(e){return this.chunks[e]}getChunkIndex(e){for(let x=0;x<this.chunks.length;x++)if(this.chunks[x].typeStr===e)return x}toBytes(){return[...s,...this.chunks.flatMap(e=>e.toBytes())]}static fromBytes(e){if(!m(e.slice(0,8)))throw Error("Invalid PNG signature.");let x=Array.from(p(e));return new t(x)}};})();
//# sourceMappingURL=index.global.js.map