Module strength 

Strength calculation for magic rules

This module implements the strength calculation algorithm based on libmagic’s apprentice_magic_strength function. Strength is used to order rules during evaluation, giving priority to more specific rules.

Algorithm Overview

The default strength of a rule is calculated based on several factors:

• Type specificity: String types have higher strength than numeric types
• Operator specificity: Equality operators are more specific than bitwise
• Offset type: Absolute offsets are more reliable than indirect/relative
• Value length: Longer strings are more specific matches

The calculated strength can be modified using !:strength directives in magic files, which apply arithmetic operations to the default strength.

Constants

MAX_STRENGTH

Maximum strength value (clamped to prevent overflow)

MIN_STRENGTH

Minimum strength value (clamped to prevent negative strength)

Functions

apply_strength_modifier

Apply a strength modifier to a base strength value.

calculate_default_strength

Calculate the default strength of a magic rule based on its specificity.

calculate_rule_strength

Calculate the final strength of a magic rule, including any modifiers.

into_sorted_by_strength

Sort magic rules by strength and return the sorted vec (consuming the input).

sort_rules_by_strength

Sort magic rules by their calculated strength in descending order.