rxlsb 0.1.0

Pure Rust XLSB (Excel Binary Workbook) reader/writer library
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[中文文档](README_cn.md) | English

# rxlsb - High Performance XLSB Library for Rust

A pure Rust implementation for reading and writing Excel XLSB (Binary) files with exceptional performance.

## Features

- **High Performance**: 200K rows/sec write, 2.3M rows/sec read, outperforming Java jxlsb
- **Zero-copy**: Bytes-based architecture minimizing memory copying
- **Streaming API**: Batch write, paginated read, stream processing
- **Template Filling**: Data filling based on existing templates
- **Type Safe**: Rust type system guarantees, no runtime errors

## Performance Comparison

| Operation | rxlsb (Rust) | jxlsb (Java) | Improvement |
|-----------|-------------|-------------|-------------|
| Stream Write | 201K/s | 137K/s | **+46%** |
| Batch Write | 190K/s | 111K/s | **+71%** |
| Stream Read | 2.3M/s | 1.95M/s | **+18%** |
| Paginated Read | 31K/s | 10K/s | **+210%** |

## Quick Start

### Writing XLSB Files

```rust
use rxlsb::{XlsbWriter, CellData};
use std::path::PathBuf;

let path = PathBuf::from("output.xlsb");
let mut writer = XlsbWriter::builder().path(&path).build().unwrap();

writer.write_batch("Sheet1", |row, col| {
    match col {
        0 => CellData::text(format!("Name-{}", row)),
        1 => CellData::number(row as f64),
        _ => CellData::blank(),
    }
}, 10000, 5).unwrap();

writer.close().unwrap();
```

### Reading XLSB Files

```rust
use rxlsb::{XlsbReader, CellData};
use std::path::PathBuf;

let path = PathBuf::from("output.xlsb");
let mut reader = XlsbReader::builder().path(&path).build().unwrap();

// Stream read
reader.for_each_row(0, |row_idx, cells| {
    println!("Row {}: {} cells", row_idx, cells.len());
}).unwrap();

// Paginated read
let rows = reader.read_rows(0, 0, 1000).unwrap();
println!("Read {} rows", rows.len());
```

## Installation

Add to your `Cargo.toml`:

```toml
[dependencies]
rxlsb = "0.1"
```

## API Overview

### CellData Types

```rust
pub enum CellData {
    Text(String),      // Text string
    Number(f64),       // Number (IEEE 754 double)
    Date(DateTime<Utc>), // Date/Time
    Bool(bool),        // Boolean
    Blank,             // Empty cell
    Error(CellError),  // Error value (#DIV/0!, #VALUE!, etc.)
}
```

### Write API

- `write_batch`: Batch write entire sheet, suitable for small-medium data
- `start_sheet / write_rows / end_sheet`: Stream write, suitable for large data

### Read API

- `for_each_row`: Stream read row by row, suitable for large data
- `read_rows`: Paginated read batch data, suitable for pagination display

## Architecture

- **Layer 1**: IO layer - BufferReader/BufferWriter (zero-copy Bytes)
- **Layer 2**: Container layer - ZIP container reader/writer
- **Layer 3**: Format layer - BIFF12 format serializer/deserializer
- **Layer 4**: API layer - XlsbReader/XlsbWriter/TemplateFiller

## Project Status

- ✅ Core read/write functionality complete
- ✅ Template filling support
- ✅ All tests passing (9 tests)
- ✅ Performance optimized (outperforming Java jxlsb)
- ✅ API documentation complete
- 🚧 More cell types support (formula, rich text)
- 🚧 Chart support

## Related Projects

- [jxlsb](https://github.com/your-org/jxlsb) - Java implementation
- [cxlsb](https://github.com/your-org/cxlsb) - ANSI C implementation
- [jsxlsb](https://github.com/your-org/jsxlsb) - Node.js implementation

## License

MIT License

## Contributing

Contributions welcome! Please read the contributing guidelines before submitting PRs.

## Changelog

See [CHANGELOG.md](CHANGELOG.md) for version history.