Restructure source files

1 files changed, 45 insertions, 0 deletions

diff --git a/src/server/buffer.cpp b/src/server/buffer.cpp
new file mode 100644
index 0000000..7b4c92d
--- /dev/null
+++ b/src/server/buffer.cpp
@@ -0,0 +1,45 @@
+struct Buffer {
+	const char *name;
+	Page *storage;
+
+	Buffer(const char *name) : name(name), storage(new Page()) {}
+
+	void free_storage() {
+		while (storage) {
+			Page *iter = storage;
+			storage = storage->next;
+			delete iter;
+		}
+	}
+
+	void read_file(const char *pathname) {
+		free_storage();
+		int file = open(pathname, O_RDONLY);
+		storage = new Page();
+		int bytes_read = read(file, storage->elements, PAGE_SIZE);
+		Page *iter = storage;
+		while (bytes_read > 0) {
+			iter->gap_start = bytes_read;
+			iter->element_count = bytes_read;
+			iter->next = new Page();
+			iter->next->prev = iter;
+			iter = iter->next;
+			bytes_read = read(file, iter->elements, PAGE_SIZE);
+		}
+		if (iter->element_count == 0) {
+			delete iter;
+		}
+		close(file);
+	}
+
+	void write_file(const char *pathname) {
+		int file = open(pathname, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+		Page *iter = storage;
+		while (iter) {
+			write(file, iter->elements, iter->gap_start);
+			write(file, iter->elements + iter->gap_end, PAGE_SIZE - iter->gap_end);
+			iter = iter->next;
+		}
+		close(file);
+	}
+};