File size: 2,686 Bytes
9b9eafc | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | // Ghi file ZIP không nén (đủ để xuất workspace) — không cần thư viện ngoài.
const CRC_TABLE = (() => {
const t = new Uint32Array(256);
for (let n = 0; n < 256; n++) {
let c = n;
for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
t[n] = c >>> 0;
}
return t;
})();
export function crc32(data: Uint8Array): number {
let c = 0xffffffff;
for (let i = 0; i < data.length; i++) c = CRC_TABLE[(c ^ data[i]) & 0xff] ^ (c >>> 8);
return (c ^ 0xffffffff) >>> 0;
}
/** files: đường dẫn → nội dung văn bản. */
export function makeZip(files: Record<string, string>): Blob {
const enc = new TextEncoder();
const parts: Uint8Array[] = [];
const central: Uint8Array[] = [];
let offset = 0;
const now = new Date();
const time = (now.getHours() << 11) | (now.getMinutes() << 5) | (now.getSeconds() >> 1);
const date = ((now.getFullYear() - 1980) << 9) | ((now.getMonth() + 1) << 5) | now.getDate();
for (const [path, text] of Object.entries(files)) {
const name = enc.encode(path.replace(/^\/+/, ''));
const data = enc.encode(text);
const crc = crc32(data);
const local = new Uint8Array(30 + name.length);
const lv = new DataView(local.buffer);
lv.setUint32(0, 0x04034b50, true);
lv.setUint16(4, 20, true);
lv.setUint16(6, 0x0800, true);
lv.setUint16(8, 0, true);
lv.setUint16(10, time, true);
lv.setUint16(12, date, true);
lv.setUint32(14, crc, true);
lv.setUint32(18, data.length, true);
lv.setUint32(22, data.length, true);
lv.setUint16(26, name.length, true);
local.set(name, 30);
const cd = new Uint8Array(46 + name.length);
const cv = new DataView(cd.buffer);
cv.setUint32(0, 0x02014b50, true);
cv.setUint16(4, 20, true);
cv.setUint16(6, 20, true);
cv.setUint16(8, 0x0800, true);
cv.setUint16(10, 0, true);
cv.setUint16(12, time, true);
cv.setUint16(14, date, true);
cv.setUint32(16, crc, true);
cv.setUint32(20, data.length, true);
cv.setUint32(24, data.length, true);
cv.setUint16(28, name.length, true);
cv.setUint32(42, offset, true);
cd.set(name, 46);
parts.push(local, data);
central.push(cd);
offset += local.length + data.length;
}
const cdSize = central.reduce((n, c) => n + c.length, 0);
const end = new Uint8Array(22);
const ev = new DataView(end.buffer);
ev.setUint32(0, 0x06054b50, true);
ev.setUint16(8, central.length, true);
ev.setUint16(10, central.length, true);
ev.setUint32(12, cdSize, true);
ev.setUint32(16, offset, true);
return new Blob([...parts, ...central, end] as BlobPart[], { type: 'application/zip' });
}
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