implement read and write bytes from device

2 files changed, 32 insertions, 0 deletions

diff --git a/kernel/filesystem/include/filesystem/device_file.hpp b/kernel/filesystem/include/filesystem/device_file.hpp
new file mode 100644
index 0000000..08d81f6
--- /dev/null
+++ b/kernel/filesystem/include/filesystem/device_file.hpp
@@ -0,0 +1,30 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_DEVICE_FILE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_DEVICE_FILE_HPP
+
+#include "devices/block_device.hpp"
+#include "devices/device.hpp"
+#include "filesystem/file.hpp"
+
+#include <cstddef>
+
+namespace filesystem
+{
+  struct device_file : file
+  {
+    device_file(devices::device * device);
+
+    auto open() -> void override;
+
+    auto read(void * buffer, size_t offset, size_t size) const -> size_t override;
+    auto write(void const * buffer, size_t offset, size_t size) -> size_t override;
+
+  private:
+    using block_op = void (*)(size_t idx, size_t off, size_t len, size_t done, devices::block_device * device,
+                              std::byte * scratch, void * buffer);
+    auto process_blocks(size_t offset, size_t size, void * buffer, block_op op) const -> size_t;
+
+    devices::device * m_device;
+  };
+}  // namespace filesystem
+
+#endif
diff --git a/kernel/filesystem/include/filesystem/open_file_description.hpp b/kernel/filesystem/include/filesystem/open_file_description.hpp
index e4febbd..3241ea4 100644
--- a/kernel/filesystem/include/filesystem/open_file_description.hpp
+++ b/kernel/filesystem/include/filesystem/open_file_description.hpp
@@ -9,6 +9,8 @@ namespace filesystem
 {
   struct open_file_description
   {
+    open_file_description(file * file);
+
     ~open_file_description() = default;
 
     auto read(void * buffer, size_t size) -> size_t;