1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

use solana_program::{
    account_info::AccountInfo, entrypoint::ProgramResult, program_error::ProgramError,
    pubkey::Pubkey,
};

// Safety verification functions
pub fn check_account_key(account: &AccountInfo, key: &Pubkey) -> ProgramResult {
    if account.key != key {
        return Err(ProgramError::InvalidArgument);
    }
    Ok(())
}

pub fn check_account_owner(account: &AccountInfo, owner: &Pubkey) -> ProgramResult {
    if account.owner != owner {
        return Err(ProgramError::InvalidArgument);
    }
    Ok(())
}

pub fn check_signer(account: &AccountInfo) -> ProgramResult {
    if !(account.is_signer) {
        return Err(ProgramError::MissingRequiredSignature);
    }
    Ok(())
}

pub(crate) const FP_32_ONE: u64 = 1 << 32;

/// a is fp0, b is fp32 and result is a/b fp0
pub(crate) fn fp32_div(a: u64, b_fp32: u64) -> u64 {
    (((a as u128) << 32) / (b_fp32 as u128)) as u64
}

/// a is fp0, b is fp32 and result is a*b fp0
pub(crate) fn fp32_mul(a: u64, b_fp32: u64) -> u64 {
    (((a as u128) * (b_fp32 as u128)) >> 32) as u64
}