Nico Verbruggen
aaf3bf8749
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34 lines
941 B
JavaScript
34 lines
941 B
JavaScript
/**
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* Parse a tar archive (uncompressed) and return a map of entry name -> Buffer.
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*/
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function parseTar(buffer) {
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const entries = {};
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let offset = 0;
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while (offset < buffer.length) {
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const header = buffer.subarray(offset, offset + 512);
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if (header.every(b => b === 0)) break;
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let name = header.subarray(0, 100).toString('utf8').replace(/\0+$/, '');
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const prefix = header.subarray(345, 500).toString('utf8').replace(/\0+$/, '');
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if (prefix) name = prefix + '/' + name;
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name = name.replace(/^\.\//, '');
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const sizeStr = header.subarray(124, 136).toString('utf8').replace(/\0+$/, '').trim();
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const size = parseInt(sizeStr, 8) || 0;
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const typeFlag = header[156];
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offset += 512;
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if (typeFlag === 48 || typeFlag === 0) {
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entries[name] = buffer.subarray(offset, offset + size);
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}
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offset += Math.ceil(size / 512) * 512;
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}
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return entries;
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}
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module.exports = { parseTar };
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