1 files changed, 54 insertions, 0 deletions

diff --git a/src/myriadfs.h b/src/myriadfs.h
new file mode 100644
index 0000000..42a3493
--- /dev/null
+++ b/src/myriadfs.h
@@ -0,0 +1,54 @@
+#ifndef MYRIAD_FS_H
+#define MYRIAD_FS_H
+
+#include "bu/myriad.h"
+
+namespace Bu
+{
+        class Stream;
+
+        subExceptionDecl( MyriadFsException );
+
+        /**
+         * A POSIX compliant, node based filesystem built on top of Myriad.
+         *
+         * A header is placed into stream 1.
+         * Header format:
+         *   int32_t iMagicHeader  (A7188B39)
+         *   int8_t iVersion (1)
+         *   int32_t iNodeSize
+         *   int32_t iNumNodes
+         *   NodeLookup[iNumNodes] nNode
+         *
+         * Node lookup:
+         *   int32_t iInode
+         *   int32_t iPosition
+         *
+         * The node headers or inode structures have a base size of 22 bytes.
+         * Everything else in the block is used for the name.  I.e. if you have
+         * a blocksize of 512 bytes then you wind up with a max name size of
+         * 512-22=490 characters, or a blocksize of 256 gives you 234 chraacters
+         * as a max.  The node headers are all stored in stream 2.
+         * Basic node header format:
+         *   int32_t iUser
+         *   int32_t iGroup
+         *   int16_t iMeta
+         *   int16_t iPerms
+         *   int32_t iStreamIndex
+         *   int32_t iParentNode
+         *   int16_t iNameSize
+         *   char[iNameSize] sName
+         */
+        class MyriadFs
+        {
+        public:
+                MyriadFs( Bu::Stream &rStore, int iBlockSize=512 );
+                virtual ~MyriadFs();
+
+        private:
+                Bu::Stream &rStore;
+                Bu::Myriad mStore;
+        };
+};
+
+#endif