fg-optional-arabic.bin

# Prepare header magic = b'FGOA' version = data['version'] rules = data['optional_features'] rule_count = len(rules)

body.append(rule.get('priority', 50))

print(f"Generated output_bin_path with rule_count rules") If this file is intended for a specific engine, use its tooling:

import mmap class OptionalArabicRules: def init (self, bin_path): with open(bin_path, 'rb') as f: self.data = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) self.parse_header()

// ... load rule table from body_offset fclose(f); return hdr;

# Hypothetical compiler hb-compile-features -f optional-arabic.txt -o fg-optional-arabic.bin 4.1 Loading in a C/C++ Application #include <stdio.h> #include <stdint.h> typedef struct uint32_t magic; uint32_t version; uint32_t rule_count; uint32_t body_offset; FGHeader;

body.append(len(inputs)) for ch in inputs: body.extend(struct.pack('<I', ch)) # Unicode codepoint

def parse_header(self): self.magic = self.data[:4] self.version = int.from_bytes(self.data[4:8], 'little') self.rule_count = int.from_bytes(self.data[8:12], 'little') # ... parse rules When shaping Arabic text, after mandatory shaping, apply optional rules:

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