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use std::fmt::{Display, Formatter};
use std::fmt;
pub(crate) const TAG_LITERAL: u8 = 0x00;
pub(crate) const TAG_COPY1: u8 = 0x01;
pub(crate) const TAG_COPY2: u8 = 0x02;
pub(crate) const TAG_COPY4: u8 = 0x03;
#[derive(Debug)]
pub enum SnappyError {
None,
EncodeTooLarge,
DecodeTooLarge,
DstTooSmall,
Corrupt,
Unsupported,
UnsupportedLiteralLength
}
impl Display for SnappyError {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "{}", str_of_error(self))
}
}
const NONE_ERR_MSG: &str = "snappy: none error";
const ENCODE_TOO_LARGE_ERR_MSG: &str = "snappy: encode block is too large";
const DECODE_TOO_LARGE_ERR_MSG: &str = "snappy: decode block is too large";
const DST_TOO_SMALL_ERR_MSG: &str = "snappy: dst len is too small";
const CORRUPT_ERR_MSG: &str = "snappy: corrupt input";
const UNSUPPORTED_ERR_MSG: &str = "snappy: unsupported input";
const UNSUPPORTED_LITERAL_LENGTH_ERR_MSG: &str = "snappy: unsupported literal length";
fn str_of_error(err: &SnappyError) -> &'static str {
return match err {
SnappyError::None => NONE_ERR_MSG,
SnappyError::EncodeTooLarge => ENCODE_TOO_LARGE_ERR_MSG,
SnappyError::DecodeTooLarge => DECODE_TOO_LARGE_ERR_MSG,
SnappyError::DstTooSmall => DST_TOO_SMALL_ERR_MSG,
SnappyError::Corrupt => CORRUPT_ERR_MSG,
SnappyError::Unsupported => UNSUPPORTED_ERR_MSG,
SnappyError::UnsupportedLiteralLength => UNSUPPORTED_LITERAL_LENGTH_ERR_MSG
}
}