Add the initial llfs implementation

project/Core/Src/llfs.c

@@ -0,0 +1,52 @@
+/**
+ * @file llfs.c
+ * @brief Linked List Filesystem implementation (llfs)
+ * @author Lorenz C.
+ * @todo Implement file extension filter
+ */
+
+#include <string.h>
+#define LOGGER_LEVEL_WARN
+#include "log.h"
+#include "llfs.h"
+
+extern struct llfs_data_file *llfs_root;
+const char* TAG = "llfs";
+
+
+// TODO: Implement file extension filter
+size_t llfs_file_list(llfs_file_t *file_list, size_t max_files, char* filter) {
+    size_t file_count = 0;
+    const struct llfs_data_file *file = llfs_root;
+
+    LOG_DEBUG(TAG, "Getting file list with filter: %s", filter);
+
+    while (file != NULL && file_count < max_files) {
+        file_list[file_count].data = file->data;
+        file_list[file_count].name = file->name;
+        file_list[file_count].len = file->len;
+        file_count++;
+        file = file->next;
+    }
+
+    LOG_DEBUG(TAG, "Files found: %d", file_count);
+    return file_count;
+}
+
+llfs_file_t *llfs_file_open(const char *name) {
+    const struct llfs_data_file *file = llfs_root;
+
+    LOG_DEBUG(TAG, "Opening file: %s", name);
+
+    while (file != NULL) {
+        if (strcmp(file->name, name) == 0) {
+            LOG_DEBUG(TAG, "File found: %s, size: %d", file->name, file->len);
+            return (llfs_file_t *) file;
+        }
+        file = file->next;
+    }
+
+    LOG_DEBUG(TAG, "File not found: %s", name);
+    return NULL;
+}
+