solana/sdk/src/loader_instruction.rs

use crate::pubkey::Pubkey;
use crate::transaction::{AccountMeta, Instruction};

#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
pub enum LoaderInstruction {
    /// Write program data into an account
    ///
    /// * key[0] - the account to write into.
    ///
    /// The transaction must be signed by key[0]
    Write { offset: u32, bytes: Vec<u8> },

    /// Finalize an account loaded with program data for execution.
    /// The exact preparation steps is loader specific but on success the loader must set the executable
    /// bit of the Account
    ///
    /// * key[0] - the account to prepare for execution
    ///
    /// The transaction must be signed by key[0]
    Finalize,
}

impl LoaderInstruction {
    pub fn new_write(
        account_id: &Pubkey,
        program_id: &Pubkey,
        offset: u32,
        bytes: Vec<u8>,
    ) -> Instruction {
        let account_metas = vec![AccountMeta::new(*account_id, true)];
        Instruction::new(
            *program_id,
            &LoaderInstruction::Write { offset, bytes },
            account_metas,
        )
    }

    pub fn new_finalize(account_id: &Pubkey, program_id: &Pubkey) -> Instruction {
        let account_metas = vec![AccountMeta::new(*account_id, true)];
        Instruction::new(*program_id, &LoaderInstruction::Finalize, account_metas)
    }
}