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use super::encoding;
/// Any zip-related error, from invalid archives to encoding problems.
#[derive(Debug, thiserror::Error)]
pub enum Error {
/// Not a valid zip file, or a variant that is unsupported.
#[error("format: {0}")]
Format(#[from] FormatError),
/// Something is not supported by this crate
#[error("unsupported: {0}")]
Unsupported(#[from] UnsupportedError),
/// Invalid UTF-8, Shift-JIS, or any problem encountered while decoding text in general.
#[error("encoding: {0:?}")]
Encoding(#[from] encoding::DecodingError),
/// I/O-related error
#[error("io: {0}")]
IO(#[from] std::io::Error),
/// Could not read as a zip because size could not be determined
#[error("size must be known to open zip file")]
UnknownSize,
}
#[derive(Debug, thiserror::Error)]
pub enum UnsupportedError {
#[error("unsupported compression method: {0:?}")]
UnsupportedCompressionMethod(crate::format::Method),
}
/// Specific zip format errors, mostly due to invalid zip archives but that could also stem from
/// implementation shortcomings.
#[derive(Debug, thiserror::Error)]
pub enum FormatError {
/// The end of central directory record was not found.
///
/// This usually indicates that the file being read is not a zip archive.
#[error("end of central directory record not found")]
DirectoryEndSignatureNotFound,
/// The zip64 end of central directory record could not be parsed.
///
/// This is only returned when a zip64 end of central directory *locator* was found,
/// so the archive should be zip64, but isn't.
#[error("zip64 end of central directory record not found")]
Directory64EndRecordInvalid,
/// Corrupted/partial zip file: the offset we found for the central directory
/// points outside of the current file.
#[error("directory offset points outside of file")]
DirectoryOffsetPointsOutsideFile,
/// The central record is corrupted somewhat.
///
/// This can happen when the end of central directory record advertises
/// a certain number of files, but we weren't able to read the same number of central directory
/// headers.
#[error("invalid central record: expected to read {expected} files, got {actual}")]
InvalidCentralRecord { expected: u16, actual: u16 },
/// An extra field (that we support) was not decoded correctly.
///
/// This can indicate an invalid zip archive, or an implementation error in this crate.
#[error("could not decode extra field")]
InvalidExtraField,
/// End of central directory record claims an impossible number of file.
///
/// Each entry takes a minimum amount of size, so if the overall archive size is smaller than
/// claimed_records_count * minimum_entry_size, we know it's not a valid zip file.
#[error("impossible number of files: claims to have {claimed_records_count}, but zip size is {zip_size}")]
ImpossibleNumberOfFiles {
claimed_records_count: u64,
zip_size: u64,
},
/// The local file header (before the file data) could not be parsed correctly.
#[error("invalid local file header")]
InvalidLocalHeader,
/// The data descriptor (after the file data) could not be parsed correctly.
#[error("invalid data descriptor")]
InvalidDataDescriptor,
/// The uncompressed size didn't match
#[error("uncompressed size didn't match: expected {expected}, got {actual}")]
WrongSize { expected: u64, actual: u64 },
/// The CRC-32 checksum didn't match.
#[error("checksum didn't match: expected {expected:x?}, got {actual:x?}")]
WrongChecksum { expected: u32, actual: u32 },
}
impl From<Error> for std::io::Error {
fn from(e: Error) -> Self {
match e {
Error::IO(e) => e,
e => std::io::Error::new(std::io::ErrorKind::Other, e),
}
}
}