Merge branch 'develop-BA-FS26' into 'develop'HEADdevelop

Merge of BA-FS26 branch into develop

See merge request teachos/kernel!49

1 files changed, 46 insertions, 0 deletions

diff --git a/kernel/src/filesystem/open_file_descriptor.cpp b/kernel/src/filesystem/open_file_descriptor.cpp
new file mode 100644
index 0000000..a5567bf
--- /dev/null
+++ b/kernel/src/filesystem/open_file_descriptor.cpp
@@ -0,0 +1,46 @@
+#include <kernel/filesystem/open_file_descriptor.hpp>
+
+#include <kernel/filesystem/dentry.hpp>
+
+#include <kstd/memory>
+#include <kstd/os/error.hpp>
+
+#include <cstddef>
+
+namespace kernel::filesystem
+{
+  open_file_descriptor::open_file_descriptor(kstd::shared_ptr<dentry> const & dentry)
+      : m_dentry(dentry)
+      , m_offset(0)
+  {
+    if (!dentry)
+    {
+      kstd::os::panic("[FILESYSTEM] open_file_descriptor constructed with null dentry.");
+    }
+  }
+
+  auto open_file_descriptor::read(void * buffer, size_t size) -> size_t
+  {
+    auto read_bytes = m_dentry->get_inode()->read(buffer, m_offset, size);
+    m_offset += read_bytes;
+    return read_bytes;
+  }
+
+  auto open_file_descriptor::write(void const * buffer, size_t size) -> size_t
+  {
+    auto written_bytes = m_dentry->get_inode()->write(buffer, m_offset, size);
+    m_offset += written_bytes;
+    return written_bytes;
+  }
+
+  auto open_file_descriptor::offset() const -> size_t
+  {
+    return m_offset;
+  }
+
+  auto open_file_descriptor::get_dentry() const -> kstd::shared_ptr<dentry> const &
+  {
+    return m_dentry;
+  }
+
+}  // namespace kernel::filesystem
\ No newline at end of file