1 files changed, 49 insertions, 0 deletions
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..7ff4e41
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,49 @@
+use lopdf::{Dictionary, Object};
+
+bitflags! {
+    pub struct FieldFlags: u32 {
+        const READONLY          = 0x1;
+        const REQUIRED          = 0x2;
+    }
+}
+
+bitflags! {
+    pub struct ButtonFlags: u32 {
+        const NO_TOGGLE_TO_OFF  = 0x8000;
+        const RADIO             = 0x10000;
+        const PUSHBUTTON        = 0x20000;
+        const RADIO_IN_UNISON   = 0x4000000;
+
+    }
+}
+
+bitflags! {
+    pub struct ChoiceFlags: u32 {
+        const COBMO             = 0x20000;
+        const EDIT              = 0x40000;
+        const SORT              = 0x80000;
+        const MULTISELECT       = 0x200000;
+        const DO_NOT_SPELLCHECK = 0x800000;
+        const COMMIT_ON_CHANGE  = 0x8000000;
+    }
+}
+
+pub fn is_read_only(field: &Dictionary) -> bool {
+    let flags = FieldFlags::from_bits_truncate(get_field_flags(field));
+
+    flags.intersects(FieldFlags::READONLY)
+}
+
+pub fn is_required(field: &Dictionary) -> bool {
+    let flags = FieldFlags::from_bits_truncate(get_field_flags(field));
+
+    flags.intersects(FieldFlags::REQUIRED)
+}
+
+pub fn get_field_flags(field: &Dictionary) -> u32 {
+    field
+        .get(b"Ff")
+        .unwrap_or(&Object::Integer(0))
+        .as_i64()
+        .unwrap() as u32
+}