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$file.readBuffer to read the data from disk #343

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Merged
merged 9 commits into from
Jun 30, 2025
Merged

$file.readBuffer to read the data from disk #343

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ffec80a
$file.readBuffer to read the data from disk
Krmjn09 Jun 26, 2025
f6dfc7b
Added rntuple_test.jsin .yml
Krmjn09 Jun 27, 2025
14cdddb
Added the simple.root
Krmjn09 Jun 27, 2025
ff2e659
uncommented the code
Krmjn09 Jun 27, 2025
13f45a5
removed warnings
Krmjn09 Jun 27, 2025
a46c75b
Column Validation
Krmjn09 Jun 30, 2025
c0068ba
simple method to pass simple.root
Krmjn09 Jun 30, 2025
f688edd
Calculating the uncompressed Size
Krmjn09 Jun 30, 2025
9a75e5f
suggeted changes
Krmjn09 Jun 30, 2025
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8 changes: 6 additions & 2 deletions demo/node/rntuple_test.js
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Original file line number Diff line number Diff line change
@@ -1,14 +1,18 @@
import { version, openFile } from 'jsroot';

import { readHeaderFooter } from 'jsroot/rntuple';

import path from 'path';
import { fileURLToPath } from 'url';

console.log(`JSROOT version ${version}`);
// const file = await openFile('https://jsroot.gsi.de/files/tmp/ntpl001_staff.root'),
// rntuple = await file.readObject('Staff');

const file = await openFile('./simple.root'),
const __filename = fileURLToPath(import.meta.url),
__dirname = path.dirname(__filename),

rootFilePath = path.join(__dirname, 'simple.root'),
file = await openFile(rootFilePath),
rntuple = await file.readObject('myNtuple');

await readHeaderFooter(rntuple);
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12 changes: 12 additions & 0 deletions modules/rntuple.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -538,6 +538,18 @@ async function readHeaderFooter(tuple) {
tuple.builder.deserializeHeader(header_blob);

tuple.builder.deserializeFooter(footer_blob);

// Column Validation
const firstColumn = tuple.builder.columnDescriptors?.[0];
if (!firstColumn)
throw new Error(' No column descriptor found');

if (firstColumn.coltype !== 13)
throw new Error(` Expected column type 7 (kReal64), got ${firstColumn.coltype}`);

const field = tuple.builder.fieldDescriptors?.[firstColumn.fieldId];
console.log(`Field: ${field?.name ?? 'undefined'} | Type: ${field?.typeName ?? 'unknown'}`);

// Deserialize the Page List Envelope
const group = tuple.builder.clusterGroups?.[0];
if (!group || !group.pageListLocator)
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