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feat(utils): add create zip util

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This commit is contained in:
Martin Varmuza
2024-11-18 18:24:25 +01:00
committed by martin
parent c25347c073
commit a640272964
2 changed files with 69 additions and 0 deletions
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1
packages/utils/src/index.ts
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@@ -50,3 +50,4 @@ export * from './extractUrlsFromText';
export * from './isFullPath';
export * from './asciiUtils';
export * from './resolveAfter';
export * from './zip';

68
packages/utils/src/zip.ts Normal file
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@@ -0,0 +1,68 @@
export const createZip = (buffers: { name: string; content: ArrayBuffer }[]) => {
const fileEntries: ArrayBuffer[] = [];
const centralDirectory: ArrayBuffer[] = [];
let offset = 0;
buffers.forEach(({ name, content }) => {
const fileData = content;
const fileHeader = new Uint8Array(30 + name.length);
const localFileHeader = new DataView(fileHeader.buffer);
// Local file header signature
localFileHeader.setUint32(0, 0x04034b50, true); // "PK\3\4"
localFileHeader.setUint16(4, 0x0, true); // Version needed to extract
localFileHeader.setUint16(6, 0x0, true); // General purpose bit flag
localFileHeader.setUint16(8, 0x0, true); // Compression method (none)
localFileHeader.setUint16(10, 0x0, true); // File last mod time
localFileHeader.setUint16(12, 0x0, true); // File last mod date
localFileHeader.setUint32(14, 0, true); // CRC-32 (skipped for simplicity)
localFileHeader.setUint32(18, fileData.byteLength, true); // Compressed size
localFileHeader.setUint32(22, fileData.byteLength, true); // Uncompressed size
localFileHeader.setUint16(26, name.length, true); // Filename length
// Filename
fileHeader.set(new TextEncoder().encode(name), 30);
fileEntries.push(fileHeader, fileData);
// Central directory
const centralHeader = new Uint8Array(46 + name.length);
const centralView = new DataView(centralHeader.buffer);
centralView.setUint32(0, 0x02014b50, true); // "PK\1\2"
centralView.setUint16(4, 0x0, true); // Version made by
centralView.setUint16(6, 0x0, true); // Version needed to extract
centralView.setUint16(8, 0x0, true); // General purpose bit flag
centralView.setUint16(10, 0x0, true); // Compression method (none)
centralView.setUint16(12, 0x0, true); // File last mod time
centralView.setUint16(14, 0x0, true); // File last mod date
centralView.setUint32(16, 0, true); // CRC-32
centralView.setUint32(20, fileData.byteLength, true); // Compressed size
centralView.setUint32(24, fileData.byteLength, true); // Uncompressed size
centralView.setUint16(28, name.length, true); // Filename length
centralView.setUint32(42, offset, true); // Offset of local header
centralHeader.set(new TextEncoder().encode(name), 46);
centralDirectory.push(centralHeader);
offset += fileHeader.length + fileData.byteLength;
});
// End of central directory record
const eocd = new Uint8Array(22);
const eocdView = new DataView(eocd.buffer);
eocdView.setUint32(0, 0x06054b50, true); // "PK\5\6"
eocdView.setUint16(8, centralDirectory.length, true); // Total number of entries
eocdView.setUint16(10, centralDirectory.length, true); // Total number of entries
eocdView.setUint32(
12,
centralDirectory.reduce((sum, cd) => sum + cd.byteLength, 0),
true,
); // Size of central directory
eocdView.setUint32(16, offset, true); // Offset of start of central directory
return new Blob([...fileEntries, ...centralDirectory, eocd], {
type: 'application/zip',
});
};