reading ext2 files and using our abstractions

1 files changed, 86 insertions, 0 deletions

diff --git a/fs/fd.c b/fs/fd.c
new file mode 100644
index 0000000..0ec134b
--- /dev/null
+++ b/fs/fd.c
@@ -0,0 +1,86 @@
+#include "kernel.h"
+#include "fd.h"
+#include "fifo.h"
+#include "kmalloc.h"
+#include "ext2.h"
+#include "log.h"
+
+bool fd_write(fd* f,uint8_t c)
+{
+    return f->write(f->data,c);
+}
+
+uint8_t fd_read(fd* f)
+{
+    return f->read(f->data);
+}
+
+bool fd_has(fd* f)
+{
+    return f->has(f->data);
+}
+
+bool fd_close(fd* f)
+{
+    return f->close(f->data);
+}
+
+fd fd_from_fifo(fifo* fif)
+{
+    fd f;
+    f.type=FD_TYPE_FIFO_BUFFERED;
+    f.data=fif;
+    f.read=fifo_get;
+    f.write=fifo_put;
+//    f.close=fd_close;
+    f.has=fifo_has;
+    return f;
+}
+
+//----
+void* ext2_init(char *path)
+{
+    uint32_t *data=kballoc(1);
+    uint32_t inode= ext2_filename_to_inode(VMEM_EXT2_RAMIMAGE,path); 
+    data[0]=inode;// pos
+    data[1]=0; //pos
+    
+    return data;
+}
+
+void ext2_write(void* x)
+{
+    kpanic("not impl");
+}
+
+uint8_t ext2_read(uint32_t* data)
+{
+    char c;
+    ext2_read_inode(VMEM_EXT2_RAMIMAGE,data[0],&c,&data[1],1);
+    return c;
+}
+
+bool ext2_has(uint32_t* data)
+{
+    uint32_t save=data[1];
+    uint32_t c=ext2_read_inode(VMEM_EXT2_RAMIMAGE,data[0],&c,&data[1],1);
+    data[1]=save;
+    return (c>0);
+
+}
+void ext2_close(void* x)
+{
+    kbfree(x);
+}
+
+fd fd_from_path(char* path)
+{
+    fd f;
+    f.type=FD_TYPE_EXT2_FILE;
+    f.data=ext2_init(path);
+    f.read=ext2_read;
+    f.write=ext2_write;
+    f.close=ext2_close;
+    f.has=ext2_has;
+    return f;
+}