### Example: Initialize tables and encrypt a block

Source: https://docs.rs/aegis_vm/latest/aegis_vm/whitebox/fn.init_tables.html

Example usage of `init_tables` and `whitebox_encrypt`. It initializes the tables at startup without any key, then encrypts a 16-byte block.

```rust
use aegis_vm::whitebox;

// Initialize tables at startup (no key involved!)
let tables = whitebox::init_tables();

// Use for encryption
let mut block = [0u8; 16];
whitebox::whitebox_encrypt(&mut block, &tables);
```

--------------------------------

### into_ok example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows how to use into_ok on a Result with an infallible error type to get the Ok value without panicking.

```rust
fn only_good_news() -> Result<String, !> {
    Ok("this is fine".into())
}

let s: String = only_good_news().into_ok();
println!("{s}");
```

--------------------------------

### and_then examples

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=

Examples for the and_then method, showing chaining fallible operations that may return Err.

```rust
assert_eq!(Ok(2).and_then(sq_then_to_string), Ok(4.to_string()));
assert_eq!(Ok(1_000_000).and_then(sq_then_to_string), Err("overflowed"));
assert_eq!(Err("not a number").and_then(sq_then_to_string), Err("not a number"));
```

```rust
use std::{io::ErrorKind, path::Path};

// Note: on Windows "/" maps to "C:\"
let root_modified_time = Path::new("/").metadata().and_then(|md| md.modified());
assert!(root_modified_time.is_ok());

let should_fail = Path::new("/bad/path").metadata().and_then(|md| md.modified());
assert!(should_fail.is_err());
assert_eq!(should_fail.unwrap_err().kind(), ErrorKind::NotFound);
```

--------------------------------

### RustAegis VM crate documentation and example

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/lib.rs.html?search=std%3A%3Avec

Crate-level documentation for RustAegis VM, a custom VM for code virtualization and protection. Includes a Rust example showing bytecode execution: 40 + 2 = 42.

```rust
//! # RustAegis VM
//!
//! Custom Virtual Machine for code virtualization and protection.
//!
//! This VM converts critical Rust code to custom bytecode that is interpreted
//! at runtime, making static analysis and patching extremely difficult.
//!
//! ## Features
//!
//! - **Hybrid Architecture**: Stack + Register based for flexibility
//! - **60+ Opcodes**: Complete instruction set for complex logic
//! - **Anti-Analysis**: Opaque predicates, timing checks, integrity verification
//! - **Cross-Platform**: Works on iOS and Android
//! - **OLLVM Compatible**: Uses fastrand instead of rand crate
//!
//! ## Example
//!
//! ```rust
//! use aegis_vm::{execute, build_config::opcodes::{stack, arithmetic, exec}};
//!
//! // Simple bytecode: 40 + 2 = 42
//! let bytecode = [
//!     stack::PUSH_IMM8, 40,
//!     stack::PUSH_IMM8, 2,
//!     arithmetic::ADD,
//!     exec::HALT,
//! ];
//!
//! let result = execute(&bytecode, &[]).unwrap();
//! assert_eq!(result, 42);
//! ```
```

--------------------------------

### Result::is_ok_and Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the is_ok_and method, which returns true if the result is Ok and the value matches a predicate.

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.is_ok_and(|x| x > 1), true);

let x: Result<u32, &str> = Ok(0);
assert_eq!(x.is_ok_and(|x| x > 1), false);

let x: Result<u32, &str> = Err("hey");
assert_eq!(x.is_ok_and(|x| x > 1), false);

let x: Result<String, &str> = Ok("ownership".to_string());
assert_eq!(x.as_ref().is_ok_and(|x| x.len() > 1), true);
println!("still alive {:?}", x);
```

--------------------------------

### Result::is_ok Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the is_ok method, which returns true if the result is Ok.

```rust
let x: Result<i32, &str> = Ok(-3);
assert_eq!(x.is_ok(), true);

let x: Result<i32, &str> = Err("Some error message");
assert_eq!(x.is_ok(), false);
```

--------------------------------

### Example output in binary

Source: https://docs.rs/aegis_vm/latest/aegis_vm/attr.obfuscate_strings.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Shows the difference between plaintext and encrypted bytes in the binary.

```rust
// Before: plaintext visible
"VM bytecode decryption failed"

// After: only encrypted bytes visible
[0x4a, 0x7f, 0x2c, 0x91, 0x3e, ...]
```

--------------------------------

### map() example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Demonstrates using `map` to apply a function to the `Ok` value of a `Result`, leaving `Err` untouched. The example parses each line of a string and prints the doubled value.

```rust
let line = "1\n2\n3\n4\n";

for num in line.lines() {
    match num.parse::<i32>().map(|i| i * 2) {
        Ok(n) => println!("{n}"),
        Err(..) => {}
    }
}
```

--------------------------------

### unwrap_or_default example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows how to use unwrap_or_default to get the contained value or a default when parsing fails.

```rust
let good_year_from_input = "1909";
let bad_year_from_input = "190blarg";
let good_year = good_year_from_input.parse().unwrap_or_default();
let bad_year = bad_year_from_input.parse().unwrap_or_default();

assert_eq!(1909, good_year);
assert_eq!(0, bad_year);
```

--------------------------------

### as_mut() example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows using `as_mut()` to get mutable references to the `Ok` or `Err` values and modify them in place.

```rust
fn mutate(r: &mut Result<i32, i32>) {
    match r.as_mut() {
        Ok(v) => *v = 42,
        Err(e) => *e = 0,
    }
}

let mut x: Result<i32, i32> = Ok(2);
mutate(&mut x);
assert_eq!(x.unwrap(), 42);

let mut x: Result<i32, i32> = Err(13);
mutate(&mut x);
assert_eq!(x.unwrap_err(), 0);
```

--------------------------------

### run

Source: https://docs.rs/aegis_vm/latest/aegis_vm

Runs the VM with the given bytecode and arguments, returning the result.

```APIDOC
## [FUNCTION] run

### Description
Runs the VM with the given bytecode and arguments, returning the result.

### Signature
```rust
pub fn run(bytecode: &[u8], args: &[u8]) -> VmResult<i64>
```

### Parameters
- **bytecode** (`&[u8]`) - The bytecode to execute.
- **args** (`&[u8]`) - The arguments to pass to the VM.

### Returns
- **VmResult<i64>** - The result of the execution, or an error.
```

--------------------------------

### into_err example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows how to use into_err on a Result with an infallible Ok type to get the Err value without panicking.

```rust
fn only_bad_news() -> Result<!, String> {
    Err("Oops, it failed".into())
}

let error: String = only_bad_news().into_err();
println!("{error}");
```

--------------------------------

### BuildInfo::new - Create new build info

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/bytecode.rs.html?search=

Starts the implementation of BuildInfo with a new method to create build info. The method body is not shown in the source.

```rust
impl BuildInfo {
    /// Create new build info
    
```

--------------------------------

### run

Source: https://docs.rs/aegis_vm/latest/aegis_vm?search=

Runs bytecode in the VM with a default state, returning the result.

```APIDOC
## run

### Description
Runs bytecode in the VM with a default state, returning the result.

### Signature
`pub fn run(bytecode: &[u8], args: &[u8]) -> VmResult<u64>`

### Parameters
- **bytecode** (slice of u8) - Required - The bytecode to run.
- **args** (slice of u8) - Required - Arguments passed to the VM.

### Returns
- **VmResult<u64>** - The result of execution, or an error.
```

--------------------------------

### new

Source: https://docs.rs/aegis_vm/latest/aegis_vm/whitebox/struct.WhiteboxCryptoContext.html?search=

Creates a new WBC crypto context, generating tables and deriving keys at startup.

```APIDOC
## new

### Description
Creates a new WBC crypto context. Generates tables and derives keys at startup (cold path). Uses build-time pre-computed domain hashes; no domain strings exist in the binary.

### Method
new

### Signature
pub fn new() -> Self

### Returns
- **Self** - A new WhiteboxCryptoContext instance.
```

--------------------------------

### iter_mut: Mutate contained value via iterator

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows `iter_mut` to get a mutable iterator over the contained value. The example modifies the `Ok` value to 40 and asserts the result.

```rust
let mut x: Result<u32, &str> = Ok(7);
match x.iter_mut().next() {
    Some(v) => *v = 40,
    None => {},
}
assert_eq!(x, Ok(40));

let mut x: Result<u32, &str> = Err("nothing!");
assert_eq!(x.iter_mut().next(), None);
```

--------------------------------

### as_deref_mut: Mutate Ok value through DerefMut

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows `as_deref_mut` to get mutable references to the `Ok` value via `DerefMut`. The example mutates the string to uppercase and asserts both `Ok` and `Err` cases.

```rust
let mut s = "HELLO".to_string();
let mut x: Result<String, u32> = Ok("hello".to_string());
let y: Result<&mut str, &mut u32> = Ok(&mut s);
assert_eq!(x.as_deref_mut().map(|x| { x.make_ascii_uppercase(); x }), y);

let mut i = 42;
let mut x: Result<String, u32> = Err(42);
let y: Result<&mut str, &mut u32> = Err(&mut i);
assert_eq!(x.as_deref_mut().map(|x| { x.make_ascii_uppercase(); x }), y);
```

--------------------------------

### ok() example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Demonstrates converting a `Result` to an `Option` using `ok()`, which returns `Some(value)` for `Ok` and `None` for `Err`.

```rust
let x: Result<u32, &str> = Ok(2);
assert_eq!(x.ok(), Some(2));

let x: Result<u32, &str> = Err("Nothing here");
assert_eq!(x.ok(), None);
```

--------------------------------

### Result::is_err Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the is_err method, which returns true if the result is Err.

```rust
let x: Result<i32, &str> = Ok(-3);
assert_eq!(x.is_err(), false);

let x: Result<i32, &str> = Err("Some error message");
assert_eq!(x.is_err(), true);
```

--------------------------------

### Result::cloned for &T Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the cloned method on Result<&T, E>, which clones the Ok value.

```rust
let val = 12;
let x: Result<&i32, i32> = Ok(&val);
assert_eq!(x, Ok(&12));
let cloned = x.cloned();
assert_eq!(cloned, Ok(12));
```

--------------------------------

### init_tables_lite()

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/whitebox/mod.rs.html?search=u32+-%3E+bool

Initializes lightweight whitebox tables (~40KB instead of ~500KB). Less secure but smaller footprint. Note: Lite tables still use runtime key derivation for now.

```APIDOC
## init_tables_lite()

### Description
Initializes lightweight whitebox tables (~40KB instead of ~500KB). Less secure but smaller footprint. Note: Lite tables still use runtime key derivation for now.

### Method
Function

### Signature
```rust
pub fn init_tables_lite() -> WhiteboxTablesLite
```

### Returns
- **WhiteboxTablesLite** - The lightweight whitebox tables.
```

--------------------------------

### Result::copied for &T Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the copied method on Result<&T, E>, which copies the Ok value.

```rust
let val = 12;
let x: Result<&i32, i32> = Ok(&val);
assert_eq!(x, Ok(&12));
let copied = x.copied();
assert_eq!(copied, Ok(12));
```

--------------------------------

### Box::new_uninit_in example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/native/type.NativeFunction.html?search=u32+-%3E+bool

Constructs a new box with uninitialized contents in the provided allocator. Shows deferred initialization with `write` and `assume_init`. Requires nightly-only `allocator_api` feature.

```rust
#![feature(allocator_api)]

use std::alloc::System;

let mut five = Box::<u32, _>::new_uninit_in(System);
// Deferred initialization:
five.write(5);
let five = unsafe { five.assume_init() };

assert_eq!(*five, 5)
```

--------------------------------

### WhiteboxCryptoContext::new: Initialize context

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/whitebox/mod.rs.html?search=

This snippet is the body of `WhiteboxCryptoContext::new`, which generates tables and derives keys at startup (cold path). It uses pre-computed domain hashes so no domain strings exist in the binary.

```rust
use crate::build_config::whitebox_config::{
    get_bytecode_domain_hash, get_smc_domain_hash
};

let tables = init_tables();

// Use pre-computed domain hashes (strings don't exist in binary!)
let bytecode_hash = get_bytecode_domain_hash();
let smc_hash = get_smc_domain_hash();

let bytecode_key = derive_key_from_hash_with_tables(&bytecode_hash, &tables);
```

--------------------------------

### init_tables

Source: https://docs.rs/aegis_vm/latest/aegis_vm/whitebox/fn.init_tables.html

Documentation for the init_tables function in the aegis_vm whitebox module.

```APIDOC
## Function init_tables

### Description
Initializes whitebox tables from build-time embedded data. The AES key is used only during compilation and does not exist at runtime, providing true white-box security. Tables are reconstructed from an entropy pool and deltas.

### Signature
```rust
pub fn init_tables() -> WhiteboxTables
```

### Parameters
None.

### Returns
- **WhiteboxTables** - The initialized whitebox tables used for encryption operations.

### Example
```rust
use aegis_vm::whitebox;

// Initialize tables at startup (no key involved!)
let tables = whitebox::init_tables();

// Use for encryption
let mut block = [0u8; 16];
whitebox::whitebox_encrypt(&mut block, &tables);
```
```

--------------------------------

### Result::cloned for &mut T Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the cloned method on Result<&mut T, E>, which clones the Ok value.

```rust
let mut val = 12;
let x: Result<&mut i32, i32> = Ok(&mut val);
assert_eq!(x, Ok(&mut 12));
let cloned = x.cloned();
assert_eq!(cloned, Ok(12));
```

--------------------------------

### expect: Recommended message style for environment variable

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows the recommended message style for `expect`: describe the reason you expect the `Result` to be `Ok`. The example reads an environment variable and panics with a message explaining the expected condition.

```rust
let path = std::env::var("IMPORTANT_PATH")
    .expect("env variable `IMPORTANT_PATH` should be set by `wrapper_script.sh`");
```

--------------------------------

### Result::copied for &mut T Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the copied method on Result<&mut T, E>, which copies the Ok value.

```rust
let mut val = 12;
let x: Result<&mut i32, i32> = Ok(&mut val);
assert_eq!(x, Ok(&mut 12));
let copied = x.copied();
assert_eq!(copied, Ok(12));
```

--------------------------------

### Result::flatten Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Examples for the flatten method on Result<Result<T, E>, E>, which removes one level of nesting.

```rust
let x: Result<Result<&'static str, u32>, u32> = Ok(Ok("hello"));
assert_eq!(Ok("hello"), x.flatten());

let x: Result<Result<&'static str, u32>, u32> = Ok(Err(6));
assert_eq!(Err(6), x.flatten());

let x: Result<Result<&'static str, u32>, u32> = Err(6);
assert_eq!(Err(6), x.flatten());
```

```rust
let x: Result<Result<Result<&'static str, u32>, u32>, u32> = Ok(Ok(Ok("hello")));
assert_eq!(Ok(Ok("hello")), x.flatten());
assert_eq!(Ok("hello"), x.flatten().flatten());
```

--------------------------------

### Result::transpose Example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Example for the transpose method on Result<Option<T>, E>, which converts a Result of an Option into an Option of a Result.

```rust
#[derive(Debug, Eq, PartialEq)]
struct SomeErr;

let x: Result<Option<i32>, SomeErr> = Ok(Some(5));
let y: Option<Result<i32, SomeErr>> = Some(Ok(5));
assert_eq!(x.transpose(), y);
```

--------------------------------

### Box::take and Box::write example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/native/type.NativeFunction.html?search=u32+-%3E+bool

Shows how to take a value out of a box and then reuse the same allocation for a new value using Box::take and Box::write.

```rust
// take the value out of the box
let (value, uninit) = Box::take(c);
assert_eq!(value, 5);

// reuse the box for a second value
let c = Box::write(uninit, 6);
assert_eq!(*c, 6);
```

--------------------------------

### Register and call native functions with NativeRegistry

Source: https://docs.rs/aegis_vm/latest/aegis_vm/native/index.html?search=

Shows how to create a NativeRegistry, register native functions with IDs 0 and 1, and call them from the VM. The first function ignores arguments and returns 42; the second doubles the first argument if present, otherwise returns 0. Calls return Result values that unwrap to the expected results.

```rust
use aegis_vm::native::{NativeRegistry, NativeFunction};

let mut registry = NativeRegistry::new();

// Register a simple function
registry.register(0, |_args| 42);

// Register a function that uses arguments
registry.register(1, |args| {
    if args.is_empty() { return 0; }
    args[0] * 2
});

// Call from VM
assert_eq!(registry.call(0, &[]).unwrap(), 42);
assert_eq!(registry.call(1, &[21]).unwrap(), 42);
```

--------------------------------

### Usage example with obfuscate_strings

Source: https://docs.rs/aegis_vm/latest/aegis_vm/attr.obfuscate_strings.html?search=Option%3CT%3E%2C+%28T+-%3E+U%29+-%3E+Option%3CU%3E

Example of applying the obfuscate_strings attribute to a function. All string literals in the function are encrypted at compile time.

```rust
use aegis_vm_macro::obfuscate_strings;

#[obfuscate_strings]
fn error_handler(code: u32) -> &'static str {
    match code {
        1 => "Invalid input",      // Encrypted!
        2 => "Access denied",      // Encrypted!
        _ => "Unknown error",      // Encrypted!
    }
}
```

--------------------------------

### run

Source: https://docs.rs/aegis_vm/latest/aegis_vm/engine/index.html?search=std%3A%3Avec

Main execution loop without native functions.

```APIDOC
## run

### Description
Main execution loop without native functions.

### Parameters
- **bytecode** (unknown) - Required - The bytecode to execute.

### Returns
- **result** (unknown) - The result of the execution.
```

--------------------------------

### map_or_else() example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Demonstrates using `map_or_else` to apply a fallback function to the `Err` value or a function to the `Ok` value. The example uses a closure that multiplies the error by 2.

```rust
let k = 21;

let x : Result<_, &str> = Ok("foo");
assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);

let x : Result<&str, _> = Err("bar");
assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
```

--------------------------------

### and_then chaining example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows how to chain fallible operations that may return Err using and_then. The example assumes sq_then_to_string is a function that returns Result<String, &str>.

```rust
assert_eq!(Ok(2).and_then(sq_then_to_string), Ok(4.to_string()));
assert_eq!(Ok(1_000_000).and_then(sq_then_to_string), Err("overflowed"));
assert_eq!(Err("not a number").and_then(sq_then_to_string), Err("not a number"));
```

--------------------------------

### BuildInfo::new

Source: https://docs.rs/aegis_vm/latest/aegis_vm/bytecode/struct.BuildInfo.html

Creates a new BuildInfo instance with the given build ID and protection level.

```APIDOC
## BuildInfo::new

### Description
Creates a new BuildInfo instance with the specified build ID and protection level.

### Method
`pub fn new(build_id: u64, protection_level: ProtectionLevel) -> Self`

### Parameters
- **build_id** (u64) - Required - Unique build identifier (derived from HMAC)
- **protection_level** (ProtectionLevel) - Required - Protection level used

### Returns
- **Self** - A new BuildInfo instance

### Example
```rust
let info = BuildInfo::new(12345, ProtectionLevel::High);
```
```

--------------------------------

### Equivalent cleanup using drop(Box::from_non_null(non_null))

Source: https://docs.rs/aegis_vm/latest/aegis_vm/native/type.NativeFunction.html?search=u32+-%3E+bool

Equivalent to the manual cleanup example, but uses Box::from_non_null inside drop to let the Box destructor handle cleanup. This is a simpler alternative to explicit deallocation.

```rust
let x = Box::new(String::from("Hello"));
let non_null = Box::into_non_null(x);
unsafe {
    drop(Box::from_non_null(non_null));
}
```

--------------------------------

### run

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/lib.rs.html?search=u32+-%3E+bool

Runs bytecode with a given state.

```APIDOC
## [Function] run

### Description
Runs a bytecode program with a given state and returns the result.

### Signature
```rust
pub fn run(bytecode: &[u8], args: &[u8], state: VmState) -> VmResult<i64>
```

### Parameters
- **bytecode** (`&[u8]`) - Required - The bytecode to execute.
- **args** (`&[u8]`) - Required - Arguments passed to the VM.
- **state** (`VmState`) - Required - The initial VM state.

### Returns
- **VmResult<i64>** - The result of the execution, or an error.
```

--------------------------------

### is_err_and example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/error/type.VmResult.html?search=std%3A%3Avec

Shows how to use `is_err_and` to check if a `Result` is `Err` and its value matches a predicate. The example uses `ErrorKind` comparisons and demonstrates that `as_ref()` can be used to avoid consuming the `Result`.

```rust
use std::io::{Error, ErrorKind};

let x: Result<u32, Error> = Err(Error::new(ErrorKind::NotFound, "!"));
assert_eq!(x.is_err_and(|x| x.kind() == ErrorKind::NotFound), true);

let x: Result<u32, Error> = Err(Error::new(ErrorKind::PermissionDenied, "!"));
assert_eq!(x.is_err_and(|x| x.kind() == ErrorKind::NotFound), false);

let x: Result<u32, Error> = Ok(123);
assert_eq!(x.is_err_and(|x| x.kind() == ErrorKind::NotFound), false);

let x: Result<u32, String> = Err("ownership".to_string());
assert_eq!(x.as_ref().is_err_and(|x| x.len() > 1), true);
println!("still alive {:?}", x);
```

--------------------------------

### try_call_once example

Source: https://docs.rs/aegis_vm/latest/aegis_vm/type.SpinOnce.html?search=

Example of using try_call_once to allow the initialization closure to fail. If the closure returns an error, the Once remains uninitialized. The method blocks if another initialization is running and panics if the Once previously panicked.

```rust
use spin;

static INIT: spin::Once<usize> = spin::Once::new();

fn get_cached_val() -> Result<usize, String> {
    INIT.try_call_once(expensive_fallible_computation).map(|x| *x)
}

fn expensive_fallible_computation() -> Result<usize, String> {
    // ...
}
```

--------------------------------

### Initialize lightweight whitebox tables

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/whitebox/mod.rs.html?search=u32+-%3E+bool

Creates a smaller whitebox table set (~40KB instead of ~500KB) with reduced security. The lite version only uses the tbox and tbox_last tables, extracting tbox_last from round 9. Note that lite tables still use runtime key derivation for now.

```rust
/// Initialize lightweight whitebox tables (~40KB instead of ~500KB)
/// Less secure but smaller footprint
///
/// **NOTE**: Lite tables still use runtime key derivation for now.
/// For maximum security, use full `init_tables()` instead.
pub fn init_tables_lite() -> WhiteboxTablesLite {
    use crate::build_config::whitebox_config::reconstruct_tbox;

    // For lite version, we only need tbox and tbox_last
    let full_tbox = reconstruct_tbox();

    // Extract tbox_last from round 9
    let mut tbox_last = [[0u8; 256]; AES_BLOCK_SIZE];
    for (pos, tbox_pos) in tbox_last.iter_mut().enumerate() {
        tbox_pos.copy_from_slice(&full_tbox[AES_ROUNDS - 1][pos]);
    }

    WhiteboxTablesLite {
        tbox: full_tbox,
        tbox_last,
    }
}
```

--------------------------------

### BytecodeHeader::new

Source: https://docs.rs/aegis_vm/latest/aegis_vm/bytecode/struct.BytecodeHeader.html?search=

Creates a new BytecodeHeader instance with the given build ID, timestamp, and flags.

```APIDOC
## BytecodeHeader::new

### Description
Creates a new BytecodeHeader instance with the specified build ID, timestamp, and flags.

### Method
new

### Signature
pub fn new(build_id: u64, timestamp: u64, flags: u16) -> Self

### Parameters
- **build_id** (u64) - Required - Unique build identifier
- **timestamp** (u64) - Required - Build timestamp (Unix epoch seconds)
- **flags** (u16) - Required - Protection flags

### Returns
- **Self** - A new BytecodeHeader instance
```

--------------------------------

### w_str_get wrapper

Source: https://docs.rs/aegis_vm/latest/src/aegis_vm/handlers/dispatch.rs.html

Wrapper for string get handler.

```rust
super::handle_str_get(s)
}
```

--------------------------------

### BuildInfo::new

Source: https://docs.rs/aegis_vm/latest/aegis_vm/bytecode/struct.BuildInfo.html?search=u32+-%3E+bool

Creates a new BuildInfo instance with the given build ID and protection level. This is the primary constructor for the struct.

```APIDOC
## BuildInfo::new

### Description
Creates a new BuildInfo instance with the provided build ID and protection level.

### Method
`pub fn new(build_id: u64, protection_level: ProtectionLevel) -> Self`

### Parameters
- **build_id** (u64) - Required - Unique build identifier (derived from HMAC)
- **protection_level** (ProtectionLevel) - Required - Protection level used

### Returns
- **Self** - A new BuildInfo instance with the given parameters.

### Example
```rust
let info = BuildInfo::new(12345, ProtectionLevel::Standard);
```
```