Crate excelstream 

excelstream

A high-performance Rust library for streaming Excel import/export operations.

Features

• Streaming Read: Read large Excel files without loading entire file into memory
• Streaming Write: Write millions of rows with constant ~80MB memory usage
• Formula Support: Write Excel formulas that calculate correctly
• High Performance: 30K-45K rows/sec throughput with streaming
• Better Errors: Context-rich error messages with debugging info
• Multiple Formats: Support for XLSX, XLS, ODS formats
• Type Safety: Strong typing with Rust’s type system
• Zero-copy: Minimize memory allocations where possible

Quick Start

Reading Excel Files (Streaming)

use excelstream::streaming_reader::StreamingReader;

let mut reader = StreamingReader::open("data.xlsx")?;

for row_result in reader.rows("Sheet1")? {
    let row = row_result?;
    println!("Row: {:?}", row);
}

Writing Excel Files (Streaming)

use excelstream::writer::ExcelWriter;
use excelstream::types::CellValue;

let mut writer = ExcelWriter::new("output.xlsx")?;

// Write header
writer.write_header(&["Name", "Age", "City"])?;

// Write data rows with typed values
writer.write_row_typed(&[
    CellValue::String("Alice".to_string()),
    CellValue::Int(30),
    CellValue::String("New York".to_string()),
])?;

// Write with formulas
writer.write_row_typed(&[
    CellValue::String("Total".to_string()),
    CellValue::Formula("=COUNT(B2:B10)".to_string()),
    CellValue::Empty,
])?;

writer.save()?;

Re-exports

pub use error::ExcelError;

pub use error::Result;

pub use streaming_reader::StreamingReader as ExcelReader;

pub use types::Cell;

pub use types::CellStyle;

pub use types::CellValue;

pub use types::ProtectionOptions;

pub use types::Row;

pub use types::StyledCell;

pub use writer::ExcelWriter;

pub use csv_reader::CsvReader;

pub use csv_writer::CsvWriter;

pub use http_csv_writer::HttpCsvWriter;

Modules

append

Incremental append mode for Excel files

csv

CSV utilities for encoding and parsing

csv_reader

CSV file reading with streaming support and decompression

csv_writer

CSV file writing with streaming support and compression

error

Error types for the rust-excelize library

fast_writer

Fast Excel writer optimized for streaming

http_csv_writer

HTTP streaming CSV writer

streaming_reader

Streaming reader for XLSX files with optimized memory usage

types

Type definitions for Excel data

writer

Excel file writing with streaming support

Enums

CompressionMethod

Compression method to use for ZIP entries