fix: validate PKT-LINE packet size to prevent DoS#1
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Add guard clause to validate that PKT-LINE packet sizes are strictly greater than 4 bytes. This prevents malformed packets with invalid sizes from causing negative size calculations that crash the stream parser. - Reject packets with size <= 4 bytes - Provide specific error message for invalid packet sizes - Preserve original error handling for invalid hex values
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Add guard clause to validate that PKT-LINE packet sizes are strictly
greater than 4 bytes. This prevents malformed packets with invalid
sizes from causing negative size calculations that crash the stream parser.