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ayunEPKCompiler.js
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ayunEPKCompiler.js
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window.compileEPK = function() {
let old = false;
// https://stackoverflow.com/a/18639903/6917520
const crc32 = (function() {
let table = new Uint32Array(256);
for (let i = 256; i--;) {
let tmp = i;
for (let k = 8; k--;) {
tmp = tmp & 1 ? 3988292384 ^ tmp >>> 1 : tmp >>> 1;
}
table[i] = tmp;
}
return function(data) {
let crc = -1;
for (let i = 0, l = data.length; i < l; i++) {
crc = crc >>> 8 ^ table[crc & 255 ^ data[i]];
}
return (crc ^ -1) >>> 0;
};
})();
function concatTypedArrays(a, b) {
const c = new (a.constructor)(a.length + b.length);
c.set(a, 0);
c.set(b, a.length);
return c;
}
const textEncoder = new TextEncoder();
function generateLongArray(num) {
return Uint8Array.of((num >>> 56) & 0xFF, (num >>> 48) & 0xFF, (num >>> 40) & 0xFF, (num >>> 32) & 0xFF, (num >>> 24) & 0xFF, (num >>> 16) & 0xFF, (num >>> 8) & 0xFF, num & 0xFF);
}
function generateIntArray(num) {
return Uint8Array.of((num >>> 24) & 0xFF, (num >>> 16) & 0xFF, (num >>> 8) & 0xFF, num & 0xFF);
}
function generateShortArray(num) {
return Uint8Array.of((num >>> 8) & 0xFF, num & 0xFF);
}
function generateUTF(str) {
return concatTypedArrays(generateShortArray(str.length), textEncoder.encode(str));
}
function generateUTFByte(str) {
return concatTypedArrays(Uint8Array.of(str.length), textEncoder.encode(str));
}
let comment = '# eaglercraft package file - generated with ayunWebEPK by ayunami2000';
let commentNew = '\n\n # Eagler EPK v2.0 (c) $$YEAR$$ Calder Young\n # generated with ayunWebEPK by ayunami2000';
let baseEPK = textEncoder.encode('EAGPKG!!');
baseEPK = concatTypedArrays(baseEPK, generateUTF(comment));
let baseEPKNew = textEncoder.encode('EAGPKG$$');
baseEPKNew = concatTypedArrays(baseEPKNew, generateUTFByte('ver2.0'));
baseEPKNew = concatTypedArrays(baseEPKNew, generateUTFByte('my-cool.epk'));
let currentEPK = null;
function processFile(name, type, file) {
if (old) {
currentEPK = currentEPK == null ? generateUTF('<file>') : concatTypedArrays(currentEPK, generateUTF('<file>'));
currentEPK = concatTypedArrays(currentEPK, generateUTF(name));
currentEPK = concatTypedArrays(currentEPK, new Uint8Array(sha1.arrayBuffer(file.buffer)));
currentEPK = concatTypedArrays(currentEPK, generateIntArray(file.byteLength));
currentEPK = concatTypedArrays(currentEPK, file);
currentEPK = concatTypedArrays(currentEPK, generateUTF('</file>'));
} else {
currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(type));
currentEPK = concatTypedArrays(currentEPK, generateUTFByte(name));
currentEPK = concatTypedArrays(currentEPK, generateIntArray(file.byteLength + 5));
currentEPK = concatTypedArrays(currentEPK, generateIntArray(crc32(file)));
currentEPK = concatTypedArrays(currentEPK, file);
currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(':>'));
}
}
function wrapItUp(size) {
if (old) {
currentEPK = concatTypedArrays(currentEPK, generateUTF(' end'));
currentEPK = concatTypedArrays(baseEPK, new Uint8Array(pako.deflate(currentEPK, { level: 9 })));
} else {
let currBaseEPK = baseEPKNew;
currBaseEPK = concatTypedArrays(currBaseEPK, generateUTF(commentNew.replace('$$YEAR$$', new Date().getFullYear())));
currBaseEPK = concatTypedArrays(currBaseEPK, generateLongArray(Date.now()));
currBaseEPK = concatTypedArrays(currBaseEPK, generateIntArray(size + 1));
currBaseEPK = concatTypedArrays(currBaseEPK, Uint8Array.of(90));
currentEPK = concatTypedArrays(currentEPK, textEncoder.encode('END$'));
currentEPK = concatTypedArrays(currBaseEPK, new Uint8Array(pako.deflate(currentEPK, { level: 9 })));
currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(':::YEE:>'));
}
const blob = new Blob([ currentEPK ], { type: 'application/octet-stream' });
currentEPK = null;
old = false;
return blob;
}
return async function(files, oldMode, fileev) {
let onfile = function() {};
if (fileev != null) {
onfile = fileev;
}
currentEPK = null;
old = oldMode;
// files is same format as output from decompiler
if (!old) {
currentEPK = textEncoder.encode('HEAD');
currentEPK = concatTypedArrays(currentEPK, generateUTFByte('file-type'));
const fileType = 'epk/resources';
currentEPK = concatTypedArrays(currentEPK, generateIntArray(fileType.length));
currentEPK = concatTypedArrays(currentEPK, textEncoder.encode(fileType));
currentEPK = concatTypedArrays(currentEPK, Uint8Array.of(62));
}
for (const file of files) {
processFile(file.name, file.type, new Uint8Array(await file.data.arrayBuffer()));
onfile();
}
return wrapItUp(files.length);
};
};