Enum FitError 

pub enum FitError {
    TooShort {
        expected: usize,
        actual: usize,
    },
    InvalidHeaderSize(u8),
    InvalidSignature([u8; 4]),
    HeaderCrcMismatch {
        stored: u16,
        calculated: u16,
    },
    FileCrcMismatch {
        stored: u16,
        calculated: u16,
    },
    UnexpectedEof {
        offset: usize,
    },
    UnknownBaseType(u8, u8),
    UndefinedLocalMesgNum(u8),
    NonZeroReserved(u8),
    MalformedField {
        field_def_num: u8,
        size: u8,
        element_size: usize,
    },
    TooManyLocalDefinitions(usize),
    FieldTooLarge {
        kind: FieldTooLargeKind,
        size: usize,
    },
}

Anything that can go wrong while reading a FIT file.

Variants

TooShort

The byte slice is shorter than required for the operation in progress.

Fields

expected: usize

Minimum number of bytes required.

actual: usize

Actual number of bytes available.

InvalidHeaderSize(u8)

The header size byte (offset 0) is neither 12 nor 14.

InvalidSignature([u8; 4])

The 4-byte signature at offset 8..12 is not the ASCII string ".FIT".

HeaderCrcMismatch

The 14-byte header carries a non-zero CRC that does not match the CRC computed over its own first 12 bytes. Per protocol, a stored CRC of 0x0000 is treated as “skip verification” (legacy firmware) and will not trigger this error.

Fields

stored: u16

CRC value stored in the header.

calculated: u16

CRC computed over the header bytes.

FileCrcMismatch

The two trailing CRC bytes do not match the CRC computed over the header + data region preceding them.

Fields

stored: u16

CRC value stored in the file trailer.

calculated: u16

CRC computed over header + data region.

UnexpectedEof

Attempted to read past the end of the byte stream.

Fields

offset: usize

Byte offset where the read failed.

UnknownBaseType(u8, u8)

A field-definition byte’s type code (after & 0x1F) does not match any of the 17 known base types.

UndefinedLocalMesgNum(u8)

A Data message references a local message number that has not been declared by a preceding Definition message.

NonZeroReserved(u8)

The reserved byte at offset 1 of a Definition message was non-zero. We don’t error on this in production parsing (just a warning), but the variant exists for strict-mode tooling.

MalformedField

A field’s wire size is not a multiple of its base type’s element size, so the byte stream cannot be cleanly partitioned into elements.

Fields

field_def_num: u8

Field definition number that failed validation.

size: u8

Wire size in bytes.

element_size: usize

Base type element size in bytes.

TooManyLocalDefinitions(usize)

The encoder was asked to emit more than 16 distinct global message numbers in a single FIT segment. Local definition slots are limited to 4 bits (0..=15) by the protocol; LRU eviction will arrive in M9.

FieldTooLarge

A field’s wire size or count exceeds 255 bytes (u8 limit).

Fields

kind: FieldTooLargeKind

What kind of object exceeded the limit.

size: usize

The actual (oversized) value.

Trait Implementations

impl Debug for FitError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for FitError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for FitError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for FitError

fn eq(&self, other: &FitError) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for FitError

impl StructuralPartialEq for FitError