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diff --git a/lib/arena.h b/lib/arena.h
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+/* Copyright (C) 2025 Aryadev Chavali
+
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
+ * details.
+
+ * You may distribute and modify this code under the terms of the GNU General
+ * Public License Version 2, which you should have received a copy of along with
+ * this program.  If not, please go to <https://www.gnu.org/licenses/>.
+
+ * Created: 2025-04-05
+ * Description: Arena
+ */
+
+#ifndef ARENA_H
+#define ARENA_H
+
+#include <base.h>
+#include <stdio.h>
+
+#define PAGE_DEFAULT_SIZE 1024
+#define MEMORY_ALIGNMENT  8
+
+typedef struct Page
+{
+  struct Page *next;
+  u64 size, capacity;
+  u8 data[];
+} page_t;
+
+page_t *page_create(u64 size);
+void page_resize(page_t **page, u64 newsize);
+// Append - fail (by returning <0) if not enough space.
+i64 page_append(page_t *page, void *data, u64 size);
+// Append - will resize if necessary
+u64 page_rappend(page_t **page, void *data, u64 size);
+
+typedef struct Aren
+{
+  page_t *start, *end;
+} arena_t;
+
+void *arena_alloc(arena_t *arena, u64 size);
+void *arena_realloc(arena_t *arena, void *ptr, u64 oldsize, u64 newsize);
+void *arena_copy(arena_t *arena, void *ptr, u64 size);
+void arena_attach(arena_t *arena, page_t *page);
+void arena_reset(arena_t *arena);
+void arena_cleanup(arena_t *arena);
+
+#endif