Enum Error 

pub enum Error {
    UnexpectedEof,
    BadMagic,
    BadHeader,
    BadOffset,
    MissingTable(&'static str),
    MissingCff,
    Cff2NotImplemented,
    GlyphOutOfRange(u16),
    UnsupportedCmapFormat(u16),
    Cff(&'static str),
    BadStructure(&'static str),
    CharstringStackOverflow,
    CharstringStackUnderflow,
    CharstringBadSubrIndex(i32),
    CharstringNoLocalSubrs,
    CharstringTooDeep,
    CharstringTooLong,
    CharstringUnsupportedOp(u16),
    CharstringSeacBadComponent(u8),
    CharstringSeacNested,
    CharstringTransientIndex(i32),
    // some variants omitted
}

Errors emitted during font parsing or glyph lookup.

Variants

UnexpectedEof

The input slice was too short for the requested header / structure.

BadMagic

The sfnt magic version did not match OTTO, 0x00010000, or true.

BadHeader

The table count in the sfnt header is implausibly large.

BadOffset

An offset / length field pointed outside the file.

MissingTable(&'static str)

A required table was missing from the table directory.

MissingCff

The font has no CFF or CFF2 table.

Cff2NotImplemented

CFF2-flavoured fonts are parsed for metadata (header, Top DICT, structural INDEXes — see the cff2 module), but Type 2 charstring decoding for CFF2 (with blend + vsindex resolution against the ItemVariationStore) is not yet implemented; Font::glyph_outline returns this error on a CFF2 font.

GlyphOutOfRange(u16)

A glyph index was out of range vs. maxp.numGlyphs / CharStrings INDEX count.

UnsupportedCmapFormat(u16)

A cmap subtable used a format we do not implement in round 1.

Cff(&'static str)

CFF-specific failure with a brief reason.

BadStructure(&'static str)

A varying-length structure was malformed in a non-CFF table (head, hhea, maxp, hmtx, name, cmap).

CharstringStackOverflow

Operand stack overflowed (>= 192 entries).

CharstringStackUnderflow

Operator consumed more operands than the stack held.

CharstringBadSubrIndex(i32)

Operator referenced a subroutine number outside the INDEX range.

CharstringNoLocalSubrs

callsubr was used in a font that has no Local Subrs INDEX.

CharstringTooDeep

Subroutine recursion exceeded the spec cap (TN5177 §4.5: 10).

CharstringTooLong

Charstring processed too many bytes (DoS bound).

CharstringUnsupportedOp(u16)

Charstring used an operator we don’t yet implement.

CharstringSeacBadComponent(u8)

endchar was used in its deprecated four-operand seac form (TN5177 Appendix C / Type 1 seac) but a referenced component glyph could not be resolved through the Standard Encoding table + the font’s charset. The contained byte is the unresolved Standard-Encoding code (bchar or achar).

CharstringSeacNested

Nested seac was attempted. The spec forbids it (TN5177 Appendix C: “This construct may not be nested.”).

CharstringTransientIndex(i32)

A put / get storage operator (TN5177 §4.5) referenced a transient-array index outside 0..32 (Appendix B fixes the array at 32 elements). The contained value is the offending index.

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

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, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Error

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 PartialEq for Error

fn eq(&self, other: &Error) -> 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 StructuralPartialEq for Error