feat: add basic resource pack parsing of pack.mcmeta

This parses the pack format ID and the description from the local file,
from both a ZIP and a folder, and hooks it into the model.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/minecraft/mod/tasks/LocalResourcePackParseTask.cpp

@@ -0,0 +1,95 @@
+#include "LocalResourcePackParseTask.h"
+
+#include "FileSystem.h"
+#include "Json.h"
+
+#include <quazip/quazip.h>
+#include <quazip/quazipfile.h>
+
+LocalResourcePackParseTask::LocalResourcePackParseTask(int token, ResourcePack& rp)
+    : Task(nullptr, false), m_token(token), m_resource_pack(rp)
+{}
+
+bool LocalResourcePackParseTask::abort()
+{
+    m_aborted = true;
+    return true;
+}
+
+void LocalResourcePackParseTask::executeTask()
+{
+    switch (m_resource_pack.type()) {
+        case ResourceType::FOLDER:
+            processAsFolder();
+            break;
+        case ResourceType::ZIPFILE:
+            processAsZip();
+            break;
+        default:
+            qWarning() << "Invalid type for resource pack parse task!";
+            emitFailed(tr("Invalid type."));
+    }
+
+    if (isFinished())
+        return;
+
+    if (m_aborted)
+        emitAborted();
+    else
+        emitSucceeded();
+}
+
+// https://minecraft.fandom.com/wiki/Tutorials/Creating_a_resource_pack#Formatting_pack.mcmeta
+void LocalResourcePackParseTask::processMCMeta(QByteArray&& raw_data)
+{
+    try {
+        auto json_doc = QJsonDocument::fromJson(raw_data);
+        auto pack_obj = Json::requireObject(json_doc.object(), "pack", {});
+
+        m_resource_pack.setPackFormat(Json::ensureInteger(pack_obj, "pack_format", 0));
+        m_resource_pack.setDescription(Json::ensureString(pack_obj, "description", ""));
+    } catch (Json::JsonException& e) {
+        qWarning() << "JsonException: " << e.what() << e.cause();
+        emitFailed(tr("Failed to process .mcmeta file."));
+    }
+}
+
+void LocalResourcePackParseTask::processAsFolder()
+{
+    QFileInfo mcmeta_file_info(FS::PathCombine(m_resource_pack.fileinfo().filePath(), "pack.mcmeta"));
+    if (mcmeta_file_info.isFile()) {
+        QFile mcmeta_file(mcmeta_file_info.filePath());
+        if (!mcmeta_file.open(QIODevice::ReadOnly))
+            return;
+
+        auto data = mcmeta_file.readAll();
+        if (data.isEmpty() || data.isNull())
+            return;
+
+        processMCMeta(std::move(data));
+    }
+}
+
+void LocalResourcePackParseTask::processAsZip()
+{
+    QuaZip zip(m_resource_pack.fileinfo().filePath());
+    if (!zip.open(QuaZip::mdUnzip))
+        return;
+
+    QuaZipFile file(&zip);
+
+    if (zip.setCurrentFile("pack.mcmeta")) {
+        if (!file.open(QIODevice::ReadOnly)) {
+            qCritical() << "Failed to open file in zip.";
+            zip.close();
+            return;
+        }
+
+        auto data = file.readAll();
+
+        processMCMeta(std::move(data));
+
+        file.close();
+        zip.close();
+    }
+}