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// SPDX-License-Identifier: MIT
//
// Copyright 2016-2025, Johann Tuffe.
use std::io::{Read, Seek};
use crate::{
datatype::DataRef,
formats::{format_excel_f64_ref, CellFormat},
utils::{read_f64, read_i32, read_u32, read_usize},
Cell, CellErrorType, Dimensions, XlsbError,
};
use super::{cell_format, parse_formula, wide_str, RecordIter};
/// A cells reader for xlsb files
pub struct XlsbCellsReader<'a, RS>
where
RS: Read + Seek,
{
iter: RecordIter<'a, RS>,
formats: &'a [CellFormat],
strings: &'a [String],
extern_sheets: &'a [String],
metadata_names: &'a [(String, String)],
typ: u16,
row: u32,
is_1904: bool,
dimensions: Dimensions,
buf: Vec<u8>,
}
impl<'a, RS> XlsbCellsReader<'a, RS>
where
RS: Read + Seek,
{
pub(crate) fn new(
mut iter: RecordIter<'a, RS>,
formats: &'a [CellFormat],
strings: &'a [String],
extern_sheets: &'a [String],
metadata_names: &'a [(String, String)],
is_1904: bool,
) -> Result<Self, XlsbError> {
let mut buf = Vec::with_capacity(1024);
// BrtWsDim
let _ = iter.next_skip_blocks(
0x0094,
&[
(0x0081, None), // BrtBeginSheet
(0x0093, None), // BrtWsProp
],
&mut buf,
)?;
let dimensions = parse_dimensions(&buf[..16]);
// BrtBeginSheetData
let _ = iter.next_skip_blocks(
0x0091,
&[
(0x0085, Some(0x0086)), // Views
(0x0025, Some(0x0026)), // AC blocks
(0x01E5, None), // BrtWsFmtInfo
(0x0186, Some(0x0187)), // Col Infos
],
&mut buf,
)?;
Ok(XlsbCellsReader {
iter,
formats,
is_1904,
strings,
extern_sheets,
metadata_names,
dimensions,
typ: 0,
row: 0,
buf,
})
}
pub fn dimensions(&self) -> Dimensions {
self.dimensions
}
pub fn next_cell(&mut self) -> Result<Option<Cell<DataRef<'a>>>, XlsbError> {
// loop until end of sheet
let value = loop {
self.buf.clear();
self.typ = self.iter.read_type()?;
let _ = self.iter.fill_buffer(&mut self.buf)?;
let value = match self.typ {
// 0x0001 => continue, // Data::Empty, // BrtCellBlank
0x0002 => {
// BrtCellRk MS-XLSB 2.5.122
let d100 = (self.buf[8] & 1) != 0;
let is_int = (self.buf[8] & 2) != 0;
self.buf[8] &= 0xFC;
if is_int {
let v = (read_i32(&self.buf[8..12]) >> 2) as i64;
if d100 {
let v = (v as f64) / 100.0;
format_excel_f64_ref(
v,
cell_format(self.formats, &self.buf),
self.is_1904,
)
} else {
DataRef::Int(v)
}
} else {
let mut v = [0u8; 8];
v[4..].copy_from_slice(&self.buf[8..12]);
let v = read_f64(&v);
let v = if d100 { v / 100.0 } else { v };
format_excel_f64_ref(v, cell_format(self.formats, &self.buf), self.is_1904)
}
}
0x0003 => {
let error = match self.buf[8] {
0x00 => CellErrorType::Null,
0x07 => CellErrorType::Div0,
0x0F => CellErrorType::Value,
0x17 => CellErrorType::Ref,
0x1D => CellErrorType::Name,
0x24 => CellErrorType::Num,
0x2A => CellErrorType::NA,
0x2B => CellErrorType::GettingData,
c => return Err(XlsbError::CellError(c)),
};
// BrtCellError
DataRef::Error(error)
}
0x0004 | 0x000A => DataRef::Bool(self.buf[8] != 0), // BrtCellBool or BrtFmlaBool
0x0005 | 0x0009 => {
let v = read_f64(&self.buf[8..16]);
format_excel_f64_ref(v, cell_format(self.formats, &self.buf), self.is_1904)
} // BrtCellReal or BrtFmlaNum
0x0006 | 0x0008 => DataRef::String(wide_str(&self.buf[8..], &mut 0)?.into_owned()), // BrtCellSt or BrtFmlaString
0x0007 => {
// BrtCellIsst
let isst = read_usize(&self.buf[8..12]);
DataRef::SharedString(&self.strings[isst])
}
0x0000 => {
// BrtRowHdr
self.row = read_u32(&self.buf);
if self.row > 0x0010_0000 {
return Ok(None); // invalid row
}
continue;
}
0x0092 => return Ok(None), // BrtEndSheetData
_ => continue, // anything else, ignore and try next, without changing idx
};
break value;
};
let col = read_u32(&self.buf);
Ok(Some(Cell::new((self.row, col), value)))
}
pub fn next_formula(&mut self) -> Result<Option<Cell<String>>, XlsbError> {
let value = loop {
self.typ = self.iter.read_type()?;
let _ = self.iter.fill_buffer(&mut self.buf)?;
let value = match self.typ {
// 0x0001 => continue, // Data::Empty, // BrtCellBlank
0x0008 => {
// BrtFmlaString
let cch = read_u32(&self.buf[8..]) as usize;
let formula = &self.buf[14 + cch * 2..];
let cce = read_u32(formula) as usize;
let rgce = &formula[4..4 + cce];
parse_formula(rgce, self.extern_sheets, self.metadata_names)?
}
0x0009 => {
// BrtFmlaNum
let formula = &self.buf[18..];
let cce = read_u32(formula) as usize;
let rgce = &formula[4..4 + cce];
parse_formula(rgce, self.extern_sheets, self.metadata_names)?
}
0x000A | 0x000B => {
// BrtFmlaBool | BrtFmlaError
let formula = &self.buf[11..];
let cce = read_u32(formula) as usize;
let rgce = &formula[4..4 + cce];
parse_formula(rgce, self.extern_sheets, self.metadata_names)?
}
0x0000 => {
// BrtRowHdr
self.row = read_u32(&self.buf);
if self.row > 0x0010_0000 {
return Ok(None); // invalid row
}
continue;
}
0x0092 => return Ok(None), // BrtEndSheetData
_ => continue, // anything else, ignore and try next, without changing idx
};
break value;
};
let col = read_u32(&self.buf);
Ok(Some(Cell::new((self.row, col), value)))
}
}
fn parse_dimensions(buf: &[u8]) -> Dimensions {
Dimensions {
start: (read_u32(&buf[0..4]), read_u32(&buf[8..12])),
end: (read_u32(&buf[4..8]), read_u32(&buf[12..16])),
}
}