# brotli

**Repository Path**: juuus/brotli

## Basic Information

- **Project Name**: brotli
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 18
- **Created**: 2022-07-07
- **Last Updated**: 2022-07-07

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# brotli

## 简介
Brotli 是一种通用无损压缩算法

## 效果展示
<img src="preview/preview.gif"/>

## 下载安装
```shell
npm i brotli-js -S
```
OpenHarmony npm环境配置等更多内容，请参考 [如何安装OpenHarmony npm包](https://gitee.com/openharmony-tpc/docs/blob/master/OpenHarmony_npm_usage.md) 。


## 使用说明

 ```ets
   import brotli from '../brotli-js';
 ```

```ets
@Entry
@Component
struct Index {
  @State mgs_compressed:string = "空"
  @State mgs_decompressed:string = "空"

private stringToBytes(str): Int8Array  {
  let out = new Int8Array(str.length);
  for (let i = 0; i < str.length; ++i) out[i] = str.charCodeAt(i);
  return out;
}

 private bytesToString(bytes): string {
   return String.fromCharCode.apply(null, new Uint16Array(bytes));
 }

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center }) {
      Text('Brotli').fontSize(15).fontColor(Color.Black)
      Text('Brotli is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression..')
        .textOverflow({ overflow: TextOverflow.None })
        .fontSize(12).border({ width: 1 }).padding(10)
      Text('压缩')
        .fontSize(20)
        .fontWeight(FontWeight.Bold)
        .onClick(() => {
          const str = 'test txt'
          const buf = new ArrayBuffer(str.length)
          const bufView = new Uint8Array(buf)

          for (let i = 0, strLen = str.length; i < strLen; i++) {
            bufView[i] = str.charCodeAt(i)
          }

          const compressed = brotli.compressArray(bufView, 6)
          const decompressed = brotli.decompressArray(compressed)
          const restoredStr = String.fromCharCode.apply(null, decompressed)
          this.mgs_compressed = compressed
          this.mgs_decompressed = restoredStr
        })
      Text('编码结果：'+this.mgs_compressed)
        .textOverflow({ overflow: TextOverflow.None })
        .fontSize(12).border({ width: 1 }).padding(10)
      Text('解码结果：'+this.mgs_decompressed)
        .textOverflow({ overflow: TextOverflow.None })
        .fontSize(12).border({ width: 1 }).padding(10)
    }
    .width('100%')
    .height('100%')
  }
}

```
## 接口说明

1. 压缩接口
```
  export function compressArray(uint: Uint8Array, level?: number)
```
2. 解压接口
```
  export function decompressArray(compressed)
```

## 兼容性
支持 OpenHarmony API version 8 及以上版本。

## 目录结构
```
│  config.json #应用程序配置文件
├─entry 
│	└─src
│		└─main
│        	├─ets
│          		└─MainAbility
│              		└─app.ets #应用程序入口  
│              		└─pages
│                      └─index.ets #调用实例
│              
│           ├─resources
│               └─base
│                   ├─element
│                   │    └─string.json #默认string文件
│                   └─media
│                        └─icon.png #默认程序图标
```

## 贡献代码
使用过程中发现任何问题都可以提 [Issue](https://gitee.com/openharmony-sig/brotli/issues) 给我们，当然，我们也非常欢迎你给我们发 [PR](https://gitee.com/openharmony-sig/brotli/pulls) 。

## 开源协议
本项目基于 [Apache License 2.0](https://gitee.com/openharmony-sig/brotli/blob/master/LICENSE) ，请自由地享受和参与开源。