Add validation for input data

[apsonawane]

This pull request focuses on improving type safety and robustness when converting JSON configuration values to integers, and fixes a potential overflow bug in the beam search scorer. The most important changes are:

Type Safety and Robustness in Configuration Parsing:

• Replaced direct static_cast<int> conversions with SafeDoubleToInt for several configuration parameters in src/config.cpp, including context_length, max_length, batch_size, and num_beams, to prevent unsafe casts and handle errors more gracefully. [1] [2]

Bug Fix in Beam Search Scorer:

• Fixed a possible integer overflow in the calculation of per_beam by explicitly casting max_length_ to size_t before multiplication in src/beam_search_scorer.cpp.

[Copilot]

Pull request overview

This PR aims to harden JSON configuration parsing for integer-valued fields and to prevent overflow-related issues in beam search buffer sizing, improving robustness of generation configuration and runtime stability.

Changes:

• Switched selected JSON numeric-to-int conversions in src/config.cpp from direct casts to SafeDoubleToInt.
• Updated the beam search intermediate buffer sizing math in src/beam_search_scorer.cpp to use size_t arithmetic.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/config.cpp	Uses a safer conversion helper for several integer-valued JSON fields during config parsing.
src/beam_search_scorer.cpp	Adjusts per_beam sizing computation to avoid signed overflow during buffer allocation.