93 lines
2.8 KiB
Rust
93 lines
2.8 KiB
Rust
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//! State transition types
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use crate::{error::TokenError, instruction::MAX_SIGNERS, option::COption};
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use solana_sdk::{program_error::ProgramError, pubkey::Pubkey};
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use std::mem::size_of;
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/// Mint data.
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#[repr(C)]
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#[derive(Clone, Copy, Debug, Default, PartialEq)]
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pub struct Mint {
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/// Optional owner, used to mint new tokens. The owner may only
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/// be provided during mint creation. If no owner is present then the mint
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/// has a fixed supply and no further tokens may be minted.
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pub owner: COption<Pubkey>,
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/// Number of base 10 digits to the right of the decimal place.
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pub decimals: u8,
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/// Is `true` if this structure has been initialized
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pub is_initialized: bool,
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}
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impl IsInitialized for Mint {
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fn is_initialized(&self) -> bool {
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self.is_initialized
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}
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}
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/// Account data.
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#[repr(C)]
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#[derive(Clone, Copy, Debug, Default, PartialEq)]
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pub struct Account {
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/// The mint associated with this account
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pub mint: Pubkey,
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/// The owner of this account.
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pub owner: Pubkey,
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/// The amount of tokens this account holds.
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pub amount: u64,
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/// If `delegate` is `Some` then `delegated_amount` represents
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/// the amount authorized by the delegate
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pub delegate: COption<Pubkey>,
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/// Is `true` if this structure has been initialized
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pub is_initialized: bool,
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/// Is this a native token
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pub is_native: bool,
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/// The amount delegated
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pub delegated_amount: u64,
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}
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impl IsInitialized for Account {
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fn is_initialized(&self) -> bool {
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self.is_initialized
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}
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}
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/// Multisignature data.
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#[repr(C)]
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#[derive(Clone, Copy, Debug, Default, PartialEq)]
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pub struct Multisig {
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/// Number of signers required
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pub m: u8,
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/// Number of valid signers
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pub n: u8,
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/// Is `true` if this structure has been initialized
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pub is_initialized: bool,
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/// Signer public keys
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pub signers: [Pubkey; MAX_SIGNERS],
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}
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impl IsInitialized for Multisig {
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fn is_initialized(&self) -> bool {
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self.is_initialized
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}
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}
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/// Check is a token state is initialized
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pub trait IsInitialized {
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/// Is initialized
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fn is_initialized(&self) -> bool;
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}
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/// Unpacks a token state from a bytes buffer while assuring that the state is initialized.
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pub fn unpack<T: IsInitialized>(input: &mut [u8]) -> Result<&mut T, ProgramError> {
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let mut_ref: &mut T = unpack_unchecked(input)?;
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if !mut_ref.is_initialized() {
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return Err(TokenError::UninitializedState.into());
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}
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Ok(mut_ref)
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}
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/// Unpacks a token state from a bytes buffer without checking that the state is initialized.
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pub fn unpack_unchecked<T: IsInitialized>(input: &mut [u8]) -> Result<&mut T, ProgramError> {
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if input.len() != size_of::<T>() {
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return Err(ProgramError::InvalidAccountData);
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}
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#[allow(clippy::cast_ptr_alignment)]
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Ok(unsafe { &mut *(&mut input[0] as *mut u8 as *mut T) })
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}
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