From d3cf3f08d1343d6b265516d5a79ce2d197b59d26 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sun, 4 Jan 2026 14:05:49 +0800
Subject: feat(file-system): implement read and write FAT32 File System and
 basic shell

---
 include/fs/file.h | 39 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

(limited to 'include/fs/file.h')

diff --git a/include/fs/file.h b/include/fs/file.h
index 2f23176..a92d8f8 100644
--- a/include/fs/file.h
+++ b/include/fs/file.h
@@ -10,6 +10,8 @@ enum FileType
     FD_PIPE
 };
 
+class Pipe;
+
 struct file
 {
     enum FileType type;
@@ -17,11 +19,46 @@ struct file
     char readable;
     char writable;
 
-    struct pipe *pipe; // pipeline pointer
+    Pipe *pipe; // pipeline pointer
     Inode *ip;         // VFS Inode
     uint32 off;        // Current Offset
 };
 
+class Pipe
+{
+public:
+    static constexpr uint32_t SIZE = 512;
+
+    Pipe() : nread(0), nwrite(0), read_open(true), write_open(true)
+    {
+        lock.init("pipe");
+    }
+
+    // forbid copy
+    Pipe(const Pipe &) = delete;
+    Pipe &operator=(const Pipe &) = delete;
+
+    ~Pipe()
+    {
+        //
+    }
+
+    // creates a pair of connected file objects
+    static int create_pair(struct file **f0, struct file **f1);
+
+    int read(uint64_t addr, int n);
+    int write(uint64_t addr, int n);
+    void close(bool is_writer);
+
+private:
+    Spinlock lock;
+    char data[SIZE];
+    uint32_t nread;  // read
+    uint32_t nwrite; // write
+    bool read_open;
+    bool write_open;
+};
+
 namespace FileTable
 {
     void init();
-- 
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