43 lines
1.5 KiB
Rust
43 lines
1.5 KiB
Rust
//! Contains a single utility function for deserializing from [bincode].
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//!
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//! [bincode]: https://docs.rs/bincode
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use {crate::instruction::InstructionError, bincode::config::Options};
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/// Deserialize with a limit based the maximum amount of data a program can expect to get.
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/// This function should be used in place of direct deserialization to help prevent OOM errors
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pub fn limited_deserialize<T>(instruction_data: &[u8], limit: u64) -> Result<T, InstructionError>
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where
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T: serde::de::DeserializeOwned,
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{
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bincode::options()
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.with_limit(limit)
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.with_fixint_encoding() // As per https://github.com/servo/bincode/issues/333, these two options are needed
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.allow_trailing_bytes() // to retain the behavior of bincode::deserialize with the new `options()` method
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.deserialize_from(instruction_data)
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.map_err(|_| InstructionError::InvalidInstructionData)
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}
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#[cfg(test)]
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pub mod tests {
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use {super::*, solana_program::system_instruction::SystemInstruction};
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#[test]
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fn test_limited_deserialize_advance_nonce_account() {
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let item = SystemInstruction::AdvanceNonceAccount;
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let serialized = bincode::serialize(&item).unwrap();
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assert_eq!(
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serialized.len(),
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4,
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"`SanitizedMessage::get_durable_nonce()` may need a change"
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);
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assert_eq!(
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limited_deserialize::<SystemInstruction>(&serialized, 4).as_ref(),
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Ok(&item)
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);
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assert!(limited_deserialize::<SystemInstruction>(&serialized, 3).is_err());
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}
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}
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