1 files changed, 60 insertions, 0 deletions
diff --git a/os/src/filesystem.c b/os/src/filesystem.c
new file mode 100644
index 0000000..64d7e0d
--- /dev/null
+++ b/os/src/filesystem.c
@@ -0,0 +1,60 @@
+#include "filesystem.h"
+#include "fio.h"
+#include "osdebug.h"
+
+#include <stdint.h>
+#include <string.h>
+#include <hash-djb2.h>
+
+#define MAX_FS 16
+
+struct fs_t {
+    uint32_t hash;
+    fs_open_t cb;
+    void * opaque;
+};
+
+static struct fs_t fss[MAX_FS];
+
+__attribute__((constructor)) void fs_init() {
+    memset(fss, 0, sizeof(fss));
+}
+
+int register_fs(const char * mountpoint, fs_open_t callback, void * opaque) {
+    int i;
+    
+    for (i = 0; i < MAX_FS; i++) {
+        if (!fss[i].cb) {
+            fss[i].hash = hash_djb2((const uint8_t *) mountpoint, -1);
+            fss[i].cb = callback;
+            fss[i].opaque = opaque;
+            return 0;
+        }
+    }
+    
+    return -1;
+}
+
+int fs_open(const char * path, int flags, int mode) {
+    const char * slash;
+    uint32_t hash;
+    int i;
+    
+    while (path[0] == '/')
+        path++;
+    
+    slash = strchr(path, '/');
+    
+    if (!slash)
+        return -2;
+
+    hash = hash_djb2((const uint8_t *) path, slash - path);
+    path = slash + 1;
+
+    for (i = 0; i < MAX_FS; i++) {
+        if (fss[i].hash == hash)
+            return fss[i].cb(fss[i].opaque, path, flags, mode);
+    }
+    
+    return -2;
+}