Add pack.js

test/pack.js

@@ -0,0 +1,105 @@
+// Copyright (c) 2013-2024 Cesanta Software Limited
+
+const Pack = async function(files) {
+  let out = `// DO NOT EDIT. This file is generated
+#include <stddef.h>
+#include <string.h>
+#include <time.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+const char *mg_unlist(size_t no);
+const char *mg_unpack(const char *, size_t *, time_t *);
+
+#if defined(__cplusplus)
+}
+#endif
+`;
+  //const str2bytes = str => new TextEncoder().encode(str);
+  let no = 1;
+  for (const f of files) {
+    let byteArray = new TextEncoder().encode(f.data);
+    if (f.zip) {
+       const cs = new CompressionStream('gzip');
+       const writer = cs.writable.getWriter();
+       writer.write(byteArray);
+       writer.close();
+       const resp = new Response(cs.readable);
+       const arr = await resp.arrayBuffer();
+       byteArray = new Uint8Array(arr);
+    }
+    const bytes = Array.from(byteArray);
+
+    // console.log(f.path, bytes);
+    out += `
+static const unsigned char v${no}[] = {`;
+    // concat(0) appends trailing 0, in order to make any file an asciz string
+    out += bytes.concat(0).join(',');
+    out +=`};`;
+    no++;
+  }
+
+  out += `
+
+static const struct packed_file {
+  const char *name;
+  const unsigned char *data;
+  size_t size;
+  time_t mtime;
+} packed_files[] = {`;
+
+  no = 1;
+  for (const f of files) {
+    out += `
+  {"/${f.path}${f.zip ? '.gz' : ''}", v${no}, sizeof(v${no}), 0},`;
+    no++;
+  }
+    out +=`
+  {NULL, NULL, 0, 0}
+};
+`;
+
+  out += `
+static int scmp(const char *a, const char *b) {
+  while (*a && (*a == *b)) a++, b++;
+  return *(const unsigned char *) a - *(const unsigned char *) b;
+}
+
+const char *mg_unlist(size_t no) {
+  return packed_files[no].name;
+}
+
+const char *mg_unpack(const char *name, size_t *size, time_t *mtime) {
+  const struct packed_file *p;
+  for (p = packed_files; p->name != NULL; p++) {
+    if (scmp(p->name, name) != 0) continue;
+    if (size != NULL) *size = p->size - 1;
+    if (mtime != NULL) *mtime = p->mtime;
+    return (const char *) p->data;
+  }
+  return NULL;
+};
+`;
+
+  return out;
+};
+
+// Script entry point
+
+const fs = require('fs');
+const path = require('path');
+const [, , ...args] = process.argv;
+
+const files = args.map(f => ({
+  path: f,
+  data: fs.readFileSync(f, 'utf8'),
+  zip: true,
+}));
+
+(async () => {
+  const text = await Pack(files);
+  process.stdout.write(text);
+})();
+