/deno-ja/denoflate - Scrapbox Reader

generated at 2/12/2025, 10:02:22 AM
denoflate
Web Assemblyで書かれたDeno用圧縮/解凍module
https://deno.land/x/denoflate
hazae41/denoflate

例: PlantUML online serverにファイルを送ってsvgへのリンクを受け取る
shdeno run --allow-net https://scrapbox.io/api/code/deno-ja/denoflate/index.ts https://scrapbox.io/api/code/deno-ja/denoflate/sample.pu
# http://www.plantuml.com/plantuml/svg/0J80pVz2Rs8jFa5iQMDb83eWQ6LiR6yAGMnfOsKjFa9lOY0w8EQNfUQShEYgdkE1f-E1Yk-zYm00
index.tsimport { deflate } from "https://deno.land/x/denoflate@1.1/mod.ts";
import { encode64 } from "./encoder.ts";
import { textToBuffer } from "./converter.ts";

const res = await fetch(Deno.args[0]);
const text = await res.text();
console.log(`http://www.plantuml.com/plantuml/svg/${encode64(deflate(textToBuffer(text), 9))}`);

converter.tsexport function textToBuffer(text: string) {
  const ascii_string = unescape(encodeURIComponent(text)); // 間にこれを噛まさないと文字化けする
  let buffer = new Uint8Array(ascii_string.length);
  for (let i = 0; i < ascii_string.length; i++) {
    buffer[i] = ascii_string.charCodeAt(i);
  }
  
  return buffer;
}

sample.puBob->Alice : hello
Alice->Bob : 日本語でおｋ

from http://plantuml.sourceforge.net/codejavascript2.html
encoder.tsexport function encode64(data: Uint8Array) {
  let r = '';
  for (let i = 0; i < data.length; i += 3) {
    if (i + 2 === data.length) {
      r += append3bytes(data[i], data[i + 1], 0);
    } else if (i + 1 === data.length) {
      r += append3bytes(data[i], 0, 0);
    } else {
      r += append3bytes(data[i], data[i + 1], data[i + 2]);
    }
  }
  return r;
}

function encode6bit(b: number) {
  if (b < 10) return String.fromCharCode(48 + b);
  b -= 10;
  if (b < 26) return String.fromCharCode(65 + b);
  b -= 26;
  if (b < 26)  return String.fromCharCode(97 + b);
  b -= 26;
  if (b === 0) return '-';
  if (b === 1) return '_';
  return '?';
}

function append3bytes(b1: number, b2: number, b3: number) {
  const c1 = b1 >> 2;
  const c2 = ((b1 & 0x3) << 4) | (b2 >> 4);
  const c3 = ((b2 & 0xF) << 2) | (b3 >> 6);
  const c4 = b3 & 0x3F;
  return encode6bit(c1 & 0x3F)
    + encode6bit(c2 & 0x3F)
    + encode6bit(c3 & 0x3F)
    + encode6bit(c4 & 0x3F);
}