Enum InvalidColumn 

pub enum InvalidColumn {
    EmptyDictionary,
    FirstOffsetNotZero,
    DecreasingOffsets,
    TokenTooLarge,
    MissingPadding,
    CodeOutOfRange,
    BadRowOffsets,
    DecodedLenOverflow,
    EmptyToken,
    UnsortedTokens,
    IncompleteAlphabet,
}

A violation found while validating compressed buffers.

Two kinds. Safety violations would let an unchecked decoder read or write out of bounds, or prevent a search tokenizer from making progress — these are exactly the obligations an unsafe safety-level constructor must uphold. A safety-valid dictionary can still be semantically malformed. Conformance violations decode safely but make search/tokenize give wrong answers. validate_safety checks only the former; validate checks both.

Variants

EmptyDictionary

The dictionary has no token, so it cannot be used by the search tokenizer.

FirstOffsetNotZero

The first dictionary offset is not zero.

DecreasingOffsets

Dictionary offsets decrease (offsets[i] > offsets[i + 1]), which would underflow the unchecked token-length subtraction.

TokenTooLarge

A dictionary token is longer than MAX_TOKEN_SIZE.

MissingPadding

A token offset has fewer than MAX_TOKEN_SIZE readable bytes after it, so the decoder’s fixed-width read runs off the end.

CodeOutOfRange

The dictionary has more than 2^16 entries, or a code does not index the dictionary (code >= num_tokens). In either case, the u16 token/code type cannot address the requested entry.

BadRowOffsets

Row offsets are not non-decreasing, or the last exceeds the code count.

DecodedLenOverflow

The column’s tokens sum to more than usize::MAX decoded bytes, so the decoded-length computation overflows and would under-size the output buffer.

EmptyToken

A dictionary token has zero length (offsets are not strictly increasing), so the search tokenizer would not make progress.

UnsortedTokens

Dictionary tokens are not in strictly ascending bytewise order, so they are not sorted (binary search breaks) or not unique.

IncompleteAlphabet

The dictionary lacks one or more of the 256 single-byte tokens, so some inputs are not encodable.

Trait Implementations

impl Clone for InvalidColumn

fn clone(&self) -> InvalidColumn

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for InvalidColumn

impl Debug for InvalidColumn

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

Formats the value using the given formatter.

impl Display for InvalidColumn

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

Formats the value using the given formatter.

impl Eq for InvalidColumn

impl Error for InvalidColumn

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 InvalidColumn

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for InvalidColumn