cmake: remove xxd dependency

html/gulpfile.js

@@ -1,6 +1,39 @@
 const { src, dest, task } = require("gulp");
 const clean = require('gulp-clean');
-const inlinesource = require('gulp-inline-source');
+const inlineSource = require('gulp-inline-source');
+const rename = require("gulp-rename");
+const through = require('through2');
+
+const toCHeader = () => {
+    return through.obj((file, enc, cb) => {
+        const buf = file.contents;
+        const len = buf.length;
+        let idx = 0;
+        let data = "unsigned char index_html[] = {\n  ";
+
+        for (const value of buf) {
+            idx++;
+
+            let current = value < 0 ? value + 256 : value;
+
+            data += "0x";
+            data += (current >>> 4).toString(16);
+            data += (current & 0xF).toString(16);
+
+            if (idx === len) {
+                data += "\n";
+            } else {
+                data += idx % 12 === 0 ? ",\n  " : ", ";
+            }
+        }
+
+        data += "};\n";
+        data += `unsigned int index_html_len = ${len};\n`;
+        file.contents = Buffer.from(data);
+
+        return cb(null, file);
+    });
+};
 
 task('clean', () => {
     return src('dist', {read: false, allowEmpty: true})
@@ -9,6 +42,8 @@ task('clean', () => {
 
 task('default', () => {
     return src('dist/index.html')
-        .pipe(inlinesource())
+        .pipe(inlineSource())
+        .pipe(toCHeader())
+        .pipe(rename("html.h"))
         .pipe(dest('../src/'));
 });