From fa0fa1fcb494483020a736a2bc2c5c639a2bd870 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 26 May 2025 17:05:36 +0200
Subject: Progress with web version

---
 web/storage.cpp | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

(limited to 'web/storage.cpp')

diff --git a/web/storage.cpp b/web/storage.cpp
index 4d0959f..cbf9e9c 100644
--- a/web/storage.cpp
+++ b/web/storage.cpp
@@ -13,13 +13,12 @@ std::string getprefix() {
 }
 
 EM_ASYNC_JS(int, loadfs, (), {
-	const dir = '/tables';
 	const inBrowser = typeof window !== 'undefined';
 	const inWorker = typeof WorkerGlobalScope !== 'undefined' &&
 	    self instanceof WorkerGlobalScope;
+	console.assert(inBrowser || inWorker, "Non-browsers not supported");
 
-	if (!(inBrowser || inWorker))
-		return;
+	const dir = '/tables';
 
 	if (!FS.analyzePath(dir).exists)
 		FS.mkdir(dir);
@@ -38,6 +37,30 @@ EM_ASYNC_JS(int, loadfs, (), {
 	}
 });
 
+EM_ASYNC_JS(int, download_and_store, (const char *key, const char *url), {
+	const inBrowser = typeof window !== 'undefined';
+	const inWorker = typeof WorkerGlobalScope !== 'undefined' &&
+	    self instanceof WorkerGlobalScope;
+	console.assert(inBrowser || inWorker, "Non-browsers not supported");
+
+	url = UTF8ToString(url);
+	key = UTF8ToString(key);
+	let response = await fetch(url);
+	if (!response.ok) {
+		console.log("Error downloading data for " + key);
+		console.log("" + response.status + ": " + response.statusText);
+		return 0;
+	}
+
+	console.log("Data for " + key + " downloaded, writing to storage...");
+	let data = await response.bytes();
+	var stream = FS.open("/tables/" + key, "w+");
+	FS.write(stream, data, 0, data.length, 0);
+	FS.close(stream);
+	console.log("Data for " + key + " stored (" + data.length + " bytes)");
+	return 1;
+});
+
 bool storage::read(std::string key, size_t data_size, char *data)
 {
 	loadfs();
@@ -65,3 +88,9 @@ bool storage::write(std::string key, size_t data_size, const char *data)
 
 	return !ofs.fail();
 }
+
+int storage::download(std::string key, std::string url)
+{
+	loadfs();
+	return download_and_store(key.c_str(), url.c_str());
+}
-- 
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