add sla .ctb format and a few related printer targets

bin/ctb2rsla.mjs

@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+
+import fs from 'fs/promises';
+import path from 'path';
+import { CTB } from '../src/kiri/mode/sla/work/x_ctb.js';
+
+let [,, input, output] = process.argv;
+
+if (!input) {
+    console.error("usage: node bin/ctb2rsla.mjs input.ctb [output.rsla]");
+    process.exit(1);
+}
+
+output = output || input.replace(/\.ctb$/i, "") + ".rsla";
+
+let data = await fs.readFile(input);
+let ctb = CTB.read(data);
+let { header, machine } = ctb;
+let lastPercent = -1;
+
+console.log([
+    "ctb",
+    machine || "unknown-machine",
+    `${header.resolutionX}x${header.resolutionY}`,
+    `${header.layerCount} layers`,
+    `${path.basename(output)}`
+].join(" "));
+
+let file = await CTB.toRSLA(data, (progress, message) => {
+    let percent = Math.floor(progress * 100);
+    if (percent !== lastPercent) {
+        lastPercent = percent;
+        process.stderr.write(`\r${message} ${percent}%`);
+    }
+});
+
+if (lastPercent >= 0) process.stderr.write("\n");
+await fs.writeFile(output, Buffer.from(file));
+console.log(`wrote ${output}`);