102 lines
2.9 KiB
Rust
102 lines
2.9 KiB
Rust
use core::convert::Infallible;
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use core::fmt::{self, Display};
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use crate::consts::{QOI_MAGIC, QOI_PIXELS_MAX};
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#[derive(Debug)]
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pub enum Error {
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InvalidChannels {
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channels: u8,
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},
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EmptyImage {
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width: u32,
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height: u32,
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},
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ImageTooLarge {
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width: u32,
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height: u32,
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},
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InvalidImageLength {
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size: usize,
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width: u32,
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height: u32,
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},
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InputBufferTooSmall {
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size: usize,
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required: usize,
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},
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OutputBufferTooSmall {
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size: usize,
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required: usize,
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},
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InvalidMagic {
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magic: u32,
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},
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UnexpectedBufferEnd,
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InvalidColorSpace {
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colorspace: u8,
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},
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InvalidPadding,
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#[cfg(feature = "std")]
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IoError(std::io::Error),
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}
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pub type Result<T> = core::result::Result<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::InvalidImageLength { size, width, height } => {
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write!(f, "invalid image length: {} for {}x{}", size, width, height)
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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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#[cfg(feature = "std")]
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Self::IoError(ref err) => {
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write!(f, "i/o error: {}", err)
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}
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}
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}
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}
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#[cfg(feature = "std")]
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impl std::error::Error 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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#[cfg(feature = "std")]
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impl From<std::io::Error> for Error {
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fn from(err: std::io::Error) -> Self {
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Self::IoError(err)
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}
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}
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