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//! Error type for `.xls` parsing.
/// Errors produced while opening or decoding a `.xls` workbook.
#[derive(Debug, thiserror::Error)]
pub enum Error {
/// The input is not an OLE2 / CFB compound file (`.xls` is OLE2-based).
#[error("not an OLE2/CFB file (.xls must start with the D0CF11E0 magic)")]
NotOle2,
/// A raw pre-OLE2 Excel 2.0/3.0/4.0 stream (BIFF2–BIFF4) was detected.
/// These predate the OLE2-wrapped `[MS-XLS]` format and are out of scope —
/// only BIFF5/7 (`Book`) and BIFF8 (`Workbook`) workbooks are read.
#[error("legacy Excel 2.0/3.0/4.0 stream (BIFF2-4) — unsupported; only BIFF5/7/8 is read")]
LegacyBiff,
/// The OLE2 container could not be opened.
#[error("failed to open compound file: {0}")]
Cfb(#[from] std::io::Error),
/// An OLE2-looking package is too corrupt or truncated to expose a bounded
/// workbook stream through either the strict CFB reader or tolerant fallback.
#[error("invalid CFB package: {0}")]
InvalidCfb(&'static str),
/// Neither the `Workbook` (BIFF8) nor `Book` (BIFF5/7) stream was found.
#[error("missing Workbook/Book stream")]
MissingWorkbook,
/// The BIFF record stream is malformed.
#[error("malformed BIFF stream: {0}")]
Biff(&'static str),
/// A ZIP-based spreadsheet container could not be opened as a ZIP package.
#[error("invalid ZIP package: {0}")]
Zip(&'static str),
/// An OOXML part's XML tree (`xmltree::XmlTree`) could not be parsed or
/// edited: malformed markup (mismatched/unclosed tags, invalid UTF-8, a
/// malformed entity reference, a misplaced XML declaration) or a budget was
/// exceeded (nesting depth, node count, attributes per element). Edits are
/// rejected rather than repaired, so a damaged part is never silently
/// rewritten into different content.
#[error("malformed or over-budget xml: {0}")]
Xml(&'static str),
/// The workbook uses an unsupported `FILEPASS` encryption mode/password.
/// Extraction is refused rather than emitting ciphertext.
#[error("unsupported encrypted workbook (FILEPASS)")]
Encrypted,
/// The input is an OLE2-wrapped encrypted OOXML package (`EncryptedPackage`
/// plus `EncryptionInfo`) rather than a readable BIFF workbook stream.
#[error("unsupported encrypted OOXML package")]
EncryptedPackage,
/// The input is an encrypted OpenDocument package. The manifest advertises
/// encrypted payload streams, but rxls does not decrypt password-protected ODF.
#[error("unsupported encrypted OpenDocument package")]
EncryptedOpenDocument,
/// The workbook parsed but contained no indexable text.
#[error("no indexable text")]
NoText,
/// The requested worksheet index does not exist or is not a grid worksheet.
#[error("sheet index out of range")]
SheetOutOfRange,
}
/// Convenience alias.
pub type Result<T> = std::result::Result<T, Error>;