HPCC-35955 Fix error parsing XML when deleting orphan file

[jackdelv]

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35955

Jirabot Action Result:
Workflow Transition To: Merge Pending
Updated PR

[Copilot]

Pull request overview

This PR addresses HPCC-35955 by adjusting how XRef XML content is read into a MemoryBuffer, aiming to prevent XML parsing errors when handling orphan file deletion scenarios in the Dali DFU XRef subsystem.

Changes:

• Changed readXrefBranch() to allocate/read exactly fileSize bytes (instead of fileSize + 1) and removed explicit null-termination.
• Left the rest of the XRef file-backed load path unchanged.

[Copilot]

Changing reserveTruncate() from (fileSize+1) to fileSize removes the null terminator previously appended by this helper, but other callers still assume a terminator is present (e.g. CXRefNode::serializeBranch drops len-1 and will now truncate the last byte). Either restore the prior contract (ensure a terminator without counting it in dst.length()), or update all call sites and the function comment to treat dst as a length-delimited buffer with no terminator.

[jackdelv]

Fixed. I left the null terminator in and changed to use the const char * overload of createPTreeFromXMLString. This way it still avoids trying to process the null terminator.

[github-actions]

Jirabot Action Result:
Added fix version: 9.14.70
Added fix version: 10.0.44
Added fix version: 10.2.18
Workflow Transition: 'Resolve issue'