initial fs implementation (mounting /app0/)

src/core/file_sys/fs.cpp

@@ -0,0 +1,91 @@
+#include "fs.h"
+
+#include <algorithm>
+
+namespace Core::FileSys {
+
+constexpr int RESERVED_HANDLES = 3;  // First 3 handles are stdin,stdout,stderr
+
+void MntPoints::mount(const std::string& host_folder, const std::string& guest_folder) {
+    std::scoped_lock lock{m_mutex};
+
+    MntPair pair;
+    pair.host_path = host_folder;
+    pair.guest_path = guest_folder;
+
+    m_mnt_pairs.push_back(pair);
+}
+void MntPoints::unmount(const std::string& path) {}  // TODO!
+void MntPoints::unmountAll() {
+    std::scoped_lock lock{m_mutex};
+    m_mnt_pairs.clear();
+}
+std::string MntPoints::getHostDirectory(const std::string& guest_directory) {
+    std::scoped_lock lock{m_mutex};
+    for (auto& pair : m_mnt_pairs) {
+        if (pair.guest_path.starts_with(guest_directory)) {
+            return pair.host_path + guest_directory;
+        }
+    }
+    // hack for relative path , get app0 and assuming it goes from there
+    for (auto& pair : m_mnt_pairs) {
+        if (pair.guest_path.starts_with("/app0")) {
+            std::replace(pair.host_path.begin(), pair.host_path.end(), '\\', '/');
+            return pair.host_path + guest_directory;
+        }
+    }
+    return "";
+}
+std::string MntPoints::getHostFile(const std::string& guest_file) {
+    std::scoped_lock lock{m_mutex};
+
+    for (auto& pair : m_mnt_pairs) {
+        //horrible code but it works :D
+        int find = guest_file.find(pair.guest_path);
+        if (find == 0) {
+            std::string npath = guest_file.substr(pair.guest_path.size(), guest_file.size()-1);
+            std::replace(pair.host_path.begin(), pair.host_path.end(), '\\', '/');
+            return pair.host_path + npath;
+        }
+    }
+    return "";
+}
+int HandleTable::createHandle() {
+    std::scoped_lock lock{m_mutex};
+    auto* file = new File{};
+    file->isDirectory = false;
+    file->isOpened = false;
+
+    int existingFilesNum = m_files.size();
+
+    for (int index = 0; index < existingFilesNum; index++) {
+        if (m_files.at(index) == nullptr) {
+            m_files[index] = file;
+            return index + RESERVED_HANDLES;
+        }
+    }
+
+    m_files.push_back(file);
+
+    return m_files.size() + RESERVED_HANDLES - 1;
+}
+void HandleTable::deleteHandle(int d) {
+    std::scoped_lock lock{m_mutex};
+    delete m_files.at(d - RESERVED_HANDLES);
+    m_files[d - RESERVED_HANDLES] = nullptr;
+}
+
+File* HandleTable::getFile(int d) {
+    std::scoped_lock lock{m_mutex};
+    return m_files.at(d - RESERVED_HANDLES);
+}
+File* HandleTable::getFile(const std::string& host_name) {
+    std::scoped_lock lock{m_mutex};
+    for (auto* file : m_files) {
+        if (file != nullptr && file->m_host_name == host_name) {
+            return file;
+        }
+    }
+    return nullptr;
+}
+}  // namespace Core::FileSys