stellar-xdr 30.0.0

Stellar XDR types, encoding, and decoding.
Documentation 
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#![cfg(feature = "std")]

use crate::{BytesM, Limits, ReadXdr, ScVal, VecM};

#[test]
fn valid_len() {
    let data = [
        0x00, 0x00, 0x00, 0x11, // SCV_MAP
        0x00, 0x00, 0x00, 0x01, // Some
        0x00, 0x00, 0x00, 0x01, // map length
        0x00, 0x00, 0x00, 0x0f, // SCV_SYMBOL
        0x00, 0x00, 0x00, 0x03, // symbol length: 3
        0x63, 0x6e, 0x74, 0x00, // symbol value : "cnt"
        0x00, 0x00, 0x00, 0x03, // SCV_U32
        0x00, 0x00, 0x00, 0x2a, // 42
    ];
    let result = ScVal::from_xdr(data, Limits::none());
    assert!(result.is_ok());
}

#[test]
fn invalid_len() {
    let data = [
        0x00, 0x00, 0x00, 0x11, // SCV_MAP
        0x00, 0x00, 0x00, 0x01, // Some
        0xff, 0xff, 0xff, 0xff, // map length (first byte invalid)
        0x00, 0x00, 0x00, 0x0f, // SCV_SYMBOL
        0x00, 0x00, 0x00, 0x03, // symbol length: 3
        0x63, 0x6e, 0x74, 0x00, // symbol value : "cnt"
        0x00, 0x00, 0x00, 0x03, // SCV_U32
        0x00, 0x00, 0x00, 0x2a, // 42
    ];
    let result = ScVal::from_xdr(data, Limits::none());
    assert!(result.is_err());
}

#[test]
fn valid_bytes_len() {
    let data = [
        0x00, 0x00, 0x00, 0x08, // length
        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    ];
    let result: Result<BytesM, _> = BytesM::from_xdr(data, Limits::none());
    assert_eq!(
        result,
        Ok(BytesM::try_from([1, 2, 3, 4, 5, 6, 7, 8]).unwrap())
    );
}

#[test]
fn valid_bytes_len_greater_than_preallocated_bytes_limit() {
    let mut data = [0x01u8; 3000];
    data[0] = 0x00; // length
    data[1] = 0x00; // length
    data[2] = 0x0B; // length
    data[3] = 0xB4; // length
    let result: Result<BytesM, _> = BytesM::from_xdr(data, Limits::none());
    assert_eq!(result, Ok(BytesM::try_from([0x01u8; 2996]).unwrap()));
}

#[test]
fn invalid_bytes_len() {
    let data = [
        0xFF, 0xFF, 0xFF, 0xFF, // length
        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    ];
    let result: Result<BytesM, _> = BytesM::from_xdr(data, Limits::none());
    assert!(result.is_err());
}

#[test]
fn into_iter_owned() {
    let v: VecM<u32, 5> = VecM::try_from(vec![1u32, 2, 3]).unwrap();
    let collected: Vec<u32> = v.into_iter().collect();
    assert_eq!(collected, vec![1, 2, 3]);
}

#[test]
fn into_iter_ref() {
    let v: VecM<u32, 5> = VecM::try_from(vec![1u32, 2, 3]).unwrap();
    let collected: Vec<&u32> = (&v).into_iter().collect();
    assert_eq!(collected, vec![&1, &2, &3]);
}

#[test]
fn into_iter_for_loop() {
    let v: VecM<u32, 5> = VecM::try_from(vec![10u32, 20, 30]).unwrap();
    let mut sum = 0;
    for item in v {
        sum += item;
    }
    assert_eq!(sum, 60);
}

#[test]
fn decode_capacity_does_not_exceed_len() {
    for len in [0u32, 1, 2, 3, 4, 5, 8, 9, 16, 17, 33, 65] {
        let mut data = len.to_be_bytes().to_vec();
        for i in 0..len {
            data.extend_from_slice(&i.to_be_bytes());
        }
        let v = VecM::<u32>::from_xdr(&data, Limits::none()).unwrap();
        assert_eq!(v.len(), len as usize);
        assert_eq!(
            v.capacity(),
            len as usize,
            "len {len}: reserved capacity should not exceed the encoded length"
        );
    }
}