Struct _ion_string

Source

#[repr(C)]pub struct _ion_string {
    pub length: i32,
    pub value: *mut BYTE,
}

Fields§

§length: i32

< The number of bytes in the value array.

§value: *mut BYTE

< UTF-8 encoded text, not null-terminated.

Implementations§

Source §

impl _ion_string

Source

pub fn try_from_mut_str(src: &mut str) -> IonCResult<Self>

Constructs an ION_STRING from a &mut str.

Note that this is effectively Ion C’s &mut str type so lifetime is managed manually by the caller.

Also note, that it is possible to violate the UTF-8 invariant of the source data, so care should be taken when using this API.

§Usage

Generally, using a mutable owned source will be the safest option.

let mut buf = "Some data".to_string();
let mut ion_str = ION_STRING::try_from_mut_str(buf.as_mut_str())?;

Source

pub fn try_from_mut_bytes(src: &mut [u8]) -> IonCResult<Self>

Constructs an ION_STRING from a &mut [u8].

Note that this is effectively Ion C’s &mut [u8] type so lifetime is managed manually by the caller.

§Usage

Generally, using a mutable owned source will be the safest option.

let mut buf = b"Some data".to_vec();
let mut ion_str = ION_STRING::try_from_mut_bytes(buf.as_mut_slice())?;

Source

pub fn try_as_str(&self) -> IonCResult<&str>

Retrieves a UTF-8 slice view from an ION_STRING.

When the value pointer is null, the conversion will fail:

let ion_str = ION_STRING::default();
match ion_str.try_as_str() {
    Ok(_) => panic!("Cannot happen!"),
    Err(e) => assert_eq!(ion_error_code_IERR_NULL_VALUE, e.code),
}

When the string is not valid UTF-8, the conversion will fail:

let mut buf = b"\xFF".to_vec();
let ion_str = ION_STRING::try_from_mut_bytes(buf.as_mut_slice()).unwrap();
match ion_str.try_as_str() {
    Ok(_) => panic!("Cannot happen!"),
    Err(e) => assert_eq!(ion_error_code_IERR_INVALID_UTF8, e.code),
}

Source

pub fn try_as_bytes<'a>(&'a self) -> IonCResult<&'a [u8]>

Retrieves a slice view from an ION_STRING

When the value pointer is null, the conversion will return an IonCError:

let ion_str = ION_STRING::default();
match ion_str.try_as_bytes() {
    Ok(_) => panic!("Cannot happen!"),
    Err(e) => assert_eq!(ion_error_code_IERR_NULL_VALUE, e.code),
}