43 lines
1.5 KiB
Rust
43 lines
1.5 KiB
Rust
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_HEADER_SIZE, QOI_MAGIC, QOI_PADDING};
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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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BadEncodingDataSize { size: usize, expected: usize },
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BadDecodingDataSize { size: usize },
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InvalidMagic { magic: [u8; 4] },
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// TODO: invalid colorspace
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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::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::BadDecodingDataSize { size } => {
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let min_size = QOI_HEADER_SIZE + QOI_PADDING;
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write!(f, "bad data size when decoding: {} (minimum required: {})", size, min_size)
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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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}
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}
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}
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impl StdError for Error {}
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