HarmonyOS 使用pako包进行gzip压缩解压缩的时候，解压缩后的数据比原数据少了10个字符 -？

Question

压缩：pako.gzip(rowData, { level: 9 })

解压缩：pako.ungzip(res, { to: ‘string’ })

其中rowData为base64 string，res为压缩后的Uint8Array数据。

Answer 1

参考示例：

import { buffer, util } from '@kit.ArkTS';
import pako from 'pako'

@Entry
@Component
struct Index {
  build() {
    Column() {
      Button("截图")
        .onClick(() => {
          let s = '123456789101111111111'
          let u = new Uint8Array(buffer.from(s, 'utf-8').buffer);
          // let rowData = new util.Base64Helper().encodeToStringSync(u)
          let rowData =
            'FAAAADAwMDIwMDAyMDI0MDUyODAwMDAw+xrWAFRRUlJWT1BKTmZpZmRXVF1eX1xfXlpjaGJmY2ZoZmZoa25nbHFua29rb25lZmhpZmpdV1pfXmJgaXB0hX+Qp6+3wMLJz9HQ0djWn2pikLS5rn9lVZnIxsLCvr27uLq5ubm3srKvq6qnpaWoqKiooZuThnJsZFVRUmJgYVldYl5UTUVIRz5BPUJOVlZXYFlmf3BST1leX2piaW5uaXFveH6CipCRlpOVmZibnZqZm52nq6icnJubnJ2eoaqoq6urq6qqqaepqKqvr6+wsa+vr6ysra+rqaiqrq+ws7Szsquus7W4srS0tbOzs7SztLS0trSyr7S0srS0s7Kxs7W1tLWztbS1t7a2s7SztbW0tbi5tbe3t7a2uLe2tLe4uLe4ubq5uri5uLi2t7i4tbW3uLe3t7e4ure5uLi5uLm5ubm5ubi5uLq6u7u5t7m7uru9u7y7vby7u7u7u7y9u7y9vby7u727vL2+vL2+vby/vr29vby+v7+9vb2+vry9vr2+v76+vr2+vr27vL67uLa2tra2tra3t7a1tbe3uLW2tbe3uLe4t7S0uLi3tbW2uLi3tre3ubi4t7m3t7e4uLi4ubq6ubq4urm5ubm5u7i5ubm5ubu6ubm6ubm5uLq8vLq7ubq0rrW4t7G0ubq6u7y7vb6+vL68u7u5u7y9vr2+vLu9vby9uby8vLy8vLy8vLy8vLy9vbu8u729vL6+v7++vb2+vr6/wL++vr2+vby7u7q5ubWuqaikpqGnqKuzs7e5uLm6u7q8vr67vLu8u7q5urq6ubq6urq6u7q6u7y8urm7ubu/v8O+wr+8vb++vr6/v8C/vr/Av7/Av77BwU1LTE9UUUxLUFJaWltlZWNgXlpeXV5bXmJiZGViZWRoa2hpaWlsa2tsbG1ua2xsaWVqZGVhWlRYWFteXGhvcn5+l6artb7Eys3N0NLazIVlYKG1vZp3XVyxyMbDwcG+vLm5uLq6uLa1sa+rqKShqqqmqaOclolzbGldVltdYGVaV2BcV01GRUM8REE+Sk1KVWtbXHBwWVlKT1pib2htbm5ubXyEg4eMkZeSk5uVnZyanJmdqqyjnZ2cnJ2enaCoqa2rqquoqqinqKiqr6+wsLCxsa+qra+vq62sq62vsbGys7OrsbW1tbO1tLSysrO0s7KztLOzs7SytLKztLS0tLWzs7W2tLa0tba1tbSztLS0tLW3t7a4t7i3tbW1trW2uLe3t7i5uLi2uLm4uLe3tra4uLe3uLi3uLm3ubq6ubm5uLm4uLm5uLm6uLm5ubm4ubm8vLy7vL28u7u8vLy7u728vLy8vLu7u7y8vr29vb29vb6+vb6+vr6+vry+vb6+v7++v769vb2+vr29vb69vLy7urm4t7S2trW3tri4tre2tre3tre3uLe0tbe4uLe2t7e2tra3uLi5ubi5t7i5uLm5uLi5ubm5uLm5uLm4ubq5urq6ubm6urq5ubq7u7q5vL68u7i4s6+1trSytrm6vLu7ury7u769u7y7ur6/vLy8vby8vb68urq8u7u8u7y7u7u8vLy7vL28vLy8vLy9vb6/vr6/v729vb+/vr6+vr69vLy9vLq3t7axsK2rqaWhoqepsLO2t7e5ubq8vLy7u7u5ubq6ubm5vLu6uru6vLu8u7q6u7i7v8HBwL++vL29vr69vr6+v7/Av7+/wMC/v8BNTk5QUlBOSE1VaWppYl9dWlxdX1xcWl1kZ2hlY2NlZ2ppaWpqa25ubHBucW9sbm1xa2ZmYlpeXVZXXV1laHOBfZWkrLfCx8nOztDU2bNrX2uuubSHblV+xMnGwr/Cvry7ubm5ure1t7Oxr6uno6aqqainoJ6WgHFrYVxdYF1iWldfYFpOSkdBQEdBOD5GT1xqaFdRZGFgTU9fYVxiZmxtbm55hYeIjJKWk5CVl5uZmZmZn6qpoZqen52fnp+iq6urrKuqqamop6enrK+wra+xsK6vrLCxr66trK6vsrKwsbKur7K0tLSys7K0tbKys7O0tLOztLSztLSzs7S0tLO2tbW0trW2tbS0tre1tLW1tLS1tre1tba2t7a3t7i3tre4t7e2t7e3uLm6t7a3t7a2uLe2ubi3t7i4ubi6ube5ube4ubm4ubi5urm6uru6urq5u7q7urm7vLu6u7u7vLy8vLu6u7u5u7q7ur27u72+vb6+vr6+vr6+vr29vby9vr29vr+9vr6+vr6+v77Avr69vb29vLy6urq3tra3t7a3t7a3t7a3t7e2t7a1tre3t7e3tba4ubm3t7e4uLe5uLm6ubi4uLi4ubi4uLm6ubq5ubq5urm5ubm6u7q5urq7u7y9u7m4tq+wtreztLm6u728vbu8u7y9vb29vLy+vLu7ury7uru8vby7vLq7u7y8vLu8vL26uru8u729vby+vry8vL2+vr69vL2/v7/AwL6/vr29vr29u7u7urm3t7Ovr6unoaOlqauusbO1urq7vLq5ubm6ure2uLm5ubq6ury8u7u7u7q6vcDBxMLAvr2+vr6/v76+v7+/v8DAwMDAv7/ARU9UUUtRTUpTY2lnbGJcW1ldXV1eX11gZWVlZGNhZmdqa2tra2tvb2xwdHBub25vb2ZjY1xfYl9aWV9iZmZzgYSQoLC5vcDJ09PT19KOaF2HtreefGNfrMrIxsK/wsC+u7q4uLy4trq2sbCwraelqauqqaKjnpF+dGhdW19cXl1XVmBZT0hCPT9GQDw9Q1FaYG1bSmNlamVYX1tXXmNkam5udYKHi46Mk5OUlJGXmZiYmqaupZ2bnJucnp6fqKysqqyrqampp6uqqa6usK6usa+ura+wsq+urKuurrGzsLKxrrGzs7SzsrSzs7KxsbO0tLKxsbK0s7O0s7KytLW0srSzs7W0tbW2tbW1tba2tbS0tbW1t7S3tLW0t7e3trW2t7i4uLm2t7m4t7a2uLe4ube3t7m4uLi4ubi5uri4ubi3t7i4t7e4ubq4ubq6u7y6u7u6urq6u7y8u7i7vL28vb28u7u8uru6ury9vLy8vr29vb29vb29vr69vb68vL29vb2+vb6+vr69v7++wL++vr6/v76+vLu9u7y5uLe5uLi2t7W2tre3t7e2tra1t7e2tbW2t7e4tri3t7e4uLi5ubi4uLm4uLq4ubi5ubq4uLm5uru6ubm6urq7ubi6urq7urq5ubKosbm3s7W5u7u7u7u7vLy7vLu9vL29vru8vLu7u7q6ury7u7y7u7y8vLy7vL68vL29vLy8vLy8vLy9vby8vr29vLu9v8C/vr+/vr6+vr2+vr29vL28vLy5uLi1s7OzrKWlpKSkrLCztLW2tba5urm4ubi5urm6urq7uru7uru5ury/wMPCwL6+v7+/v7+/v7+/wL/Av76/wMDBwElKT1FPUVFOVmBmZGhiXF1bXl1bYGJiY2JhYmVlY2ZmZ2ppbG1ubm1wbXBsbW5va2piZGJjYlpgXVddYWRmc36GkJ+yu7m/ydLU1ti+c2Nopbixim9ecb'
          console.log('rowData    ' + rowData);

          const res: string | Uint8Array | undefined = pako.gzip(rowData, { level: 9 });
          console.log('res' + res);

          let ss: string | Uint8Array | undefined = pako.ungzip(res, { to: 'string' })
          console.log('ss' + ss)

        }).margin(10)
    }
    .width('100%')
    .height('100%')
    .alignItems(HorizontalAlign.Center)
  }
}