69 lines
2.5 KiB
Rust
69 lines
2.5 KiB
Rust
use std::convert::Infallible;
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use std::error::Error as StdError;
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use std::fmt::{self, Display};
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use std::result::Result as StdResult;
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use crate::consts::{QOI_MAGIC, QOI_PIXELS_MAX};
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub enum Error {
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InvalidChannels { channels: u8 },
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EmptyImage { width: u32, height: u32 },
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ImageTooLarge { width: u32, height: u32 },
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BadEncodingDataSize { size: usize, expected: usize },
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InputBufferTooSmall { size: usize, required: usize },
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OutputBufferTooSmall { size: usize, required: usize },
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InvalidMagic { magic: u32 },
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UnexpectedBufferEnd,
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InvalidColorSpace { colorspace: u8 },
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InvalidPadding,
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}
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pub type Result<T> = StdResult<T, Error>;
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impl Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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Self::InvalidChannels { channels } => {
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write!(f, "invalid number of channels: {}", channels)
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}
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Self::EmptyImage { width, height } => {
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write!(f, "image contains no pixels: {}x{}", width, height)
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}
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Self::ImageTooLarge { width, height } => {
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let mp = QOI_PIXELS_MAX / 1_000_000;
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write!(f, "image is too large: {}x{} (max={}Mp)", width, height, mp)
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}
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Self::BadEncodingDataSize { size, expected } => {
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write!(f, "bad data size when encoding: {} (expected: {})", size, expected)
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}
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Self::InputBufferTooSmall { size, required } => {
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write!(f, "input buffer size too small: {} (minimum required: {})", size, required)
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}
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Self::OutputBufferTooSmall { size, required } => {
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write!(f, "output buffer size too small: {} (minimum required: {})", size, required)
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}
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Self::InvalidMagic { magic } => {
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write!(f, "invalid magic: expected {:?}, got {:?}", QOI_MAGIC, magic)
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}
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Self::UnexpectedBufferEnd => {
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write!(f, "unexpected input buffer end while decoding")
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}
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Self::InvalidColorSpace { colorspace } => {
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write!(f, "invalid color space: {} (expected 0 or 1)", colorspace)
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}
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Self::InvalidPadding => {
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write!(f, "invalid padding (stream end marker)")
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}
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}
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}
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}
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impl StdError for Error {}
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impl From<Infallible> for Error {
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fn from(_: Infallible) -> Self {
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unreachable!()
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}
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}
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