block_header impl

cairo_vm_hints/src/hint_processor.rs

@@ -69,6 +69,9 @@ fn run_hint(
                 vm, exec_scope, hint_data, constants,
             )
         }
+        lib::block_header::HINT_RLP_BIGINT_SIZE => {
+            lib::block_header::hint_rlp_bigint_size(vm, exec_scope, hint_data, constants)
+        }
         _ => Err(HintError::UnknownHint(
             hint_data.code.to_string().into_boxed_str(),
         )),

cairo_vm_hints/src/hints/lib/block_header/mod.rs

@@ -1 +1,32 @@
+use cairo_vm::hint_processor::builtin_hint_processor::builtin_hint_processor_definition::HintProcessorData;
+use cairo_vm::hint_processor::builtin_hint_processor::hint_utils::{
+    get_integer_from_var_name, insert_value_into_ap,
+};
+use cairo_vm::types::exec_scope::ExecutionScopes;
+use cairo_vm::types::relocatable::MaybeRelocatable;
+use cairo_vm::vm::{errors::hint_errors::HintError, vm_core::VirtualMachine};
+use cairo_vm::Felt252;
+use std::cmp::Ordering;
+use std::collections::HashMap;
 
+pub const HINT_RLP_BIGINT_SIZE: &str = "memory[ap] = 1 if ids.byte <= 127 else 0";
+
+const FELT_127: Felt252 = Felt252::from_hex_unchecked("0x7F");
+
+pub fn hint_rlp_bigint_size(
+    vm: &mut VirtualMachine,
+    _exec_scope: &mut ExecutionScopes,
+    hint_data: &HintProcessorData,
+    _constants: &HashMap<String, Felt252>,
+) -> Result<(), HintError> {
+    match get_integer_from_var_name("byte", vm, &hint_data.ids_data, &hint_data.ap_tracking)?
+        .cmp(&FELT_127)
+    {
+        Ordering::Less | Ordering::Equal => {
+            insert_value_into_ap(vm, MaybeRelocatable::Int(Felt252::ONE))?
+        }
+        Ordering::Greater => insert_value_into_ap(vm, MaybeRelocatable::Int(Felt252::ZERO))?,
+    };
+
+    Ok(())
+}