Enum Error 

#[non_exhaustive]
pub enum Error {
    Io(Error),
    InvalidSignature([u8; 4]),
    InvalidPageTag,
    InvalidPageEnd,
    InvalidCookieHeaderEnd,
    UnexpectedEof,
    TooManyPages(u32),
    TooManyCookies(u32),
    CookieTooLarge {
        component: Component,
        size: u32,
    },
    CookieTotalTooLarge(u32),
    MalformedOffsets,
}

Errors produced while decoding a .binarycookies file.

Every malformed input maps to a variant here; the decoder never panics.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Io(Error)

The underlying reader failed; only from_reader / from_path produce this.

InvalidSignature([u8; 4])

The file does not start with the cook magic; carries the four bytes found.

InvalidPageTag

A page does not start with the 00 00 01 00 tag.

InvalidPageEnd

A page header does not end with the 00 00 00 00 marker.

InvalidCookieHeaderEnd

A cookie header does not end with the 00 00 00 00 marker.

UnexpectedEof

The input ended before the structure it declares was fully read.

TooManyPages(u32)

The declared page count exceeds the hardening cap of 65 536.

TooManyCookies(u32)

The declared per-page cookie count exceeds the hardening cap of 1 048 576.

CookieTooLarge

One of the five cookie components is longer than 4096 bytes.

Fields

component: Component

Which component overflowed.

size: u32

Length of the offending component in bytes.

CookieTotalTooLarge(u32)

The five cookie components together exceed 4096 bytes.

MalformedOffsets

Cookie string offsets are not monotonically increasing.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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 From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.