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ZIP CRC-32 checksum lisätty: purkaminen ei enää epäonnistu

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Local file header ja central directory entry -tietueista puuttui
CRC-32 kenttä. Lisätty crc32()-funktio ja kirjoitetaan checksum
molempiin ZIP-rakenteisiin.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
jaakko
2026-04-07 06:31:42 +03:00
parent f2ca4890df
commit 01d8b597e1
1 changed files with 17 additions and 3 deletions
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20
network-poc/static/index.html
View File

@@ -1989,7 +1989,18 @@
if (!card) return;
const files = projectFiles[cardId];
// Luodaan ZIP ilman ulkoisia kirjastoja (yksinkertainen uncompressed ZIP)
// CRC-32 laskenta ZIP-tiedostoille
function crc32(bytes) {
let crc = 0xFFFFFFFF;
for (let i = 0; i < bytes.length; i++) {
crc ^= bytes[i];
for (let j = 0; j < 8; j++) {
crc = (crc >>> 1) ^ (crc & 1 ? 0xEDB88320 : 0);
}
}
return (crc ^ 0xFFFFFFFF) >>> 0;
}
const entries = Object.entries(files);
const parts = [];
const centralDir = [];
@@ -1998,6 +2009,7 @@
for (const [name, content] of entries) {
const nameBytes = new TextEncoder().encode(name);
const contentBytes = new TextEncoder().encode(content);
const crc = crc32(contentBytes);
// Local file header
const header = new Uint8Array(30 + nameBytes.length);
@@ -2005,8 +2017,9 @@
view.setUint32(0, 0x04034b50, true); // Signature
view.setUint16(4, 20, true); // Version needed
view.setUint16(8, 0, true); // Method: store
view.setUint32(18, contentBytes.length, true); // Compressed size
view.setUint32(22, contentBytes.length, true); // Uncompressed size
view.setUint32(14, crc, true); // CRC-32
view.setUint32(18, contentBytes.length, true);
view.setUint32(22, contentBytes.length, true);
view.setUint16(26, nameBytes.length, true);
header.set(nameBytes, 30);
@@ -2016,6 +2029,7 @@
cdView.setUint32(0, 0x02014b50, true);
cdView.setUint16(4, 20, true);
cdView.setUint16(6, 20, true);
cdView.setUint32(16, crc, true); // CRC-32
cdView.setUint32(20, contentBytes.length, true);
cdView.setUint32(24, contentBytes.length, true);
cdView.setUint16(28, nameBytes.length, true);