/*
 * Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de.
 * Distributed under the terms of the MIT License.
 */
#ifndef CHECK_SUM_FS_H
#define CHECK_SUM_FS_H


#include <OS.h>


#define CHECK_SUM_FS_PRETTY_NAME        "CheckSum File System"


static const uint64 kCheckSumFSSuperBlockOffset = 16 * B_PAGE_SIZE;
static const uint64 kCheckSumFSMinSize
        = kCheckSumFSSuperBlockOffset + 16 * B_PAGE_SIZE;


static const uint32 kCheckSumFSNameLength               = 256;

static const uint32 kCheckSumFSSignatureLength  = 16;
#define CHECK_SUM_FS_SIGNATURE_1        "_1!cHEcKsUmfS!1_"
#define CHECK_SUM_FS_SIGNATURE_2        "-2@ChECkSumFs@2-"

static const uint32 kCheckSumFSVersion = 1;

struct checksumfs_super_block {
        char    signature1[kCheckSumFSSignatureLength];
        uint32  version;
        uint32  pad1;
        uint64  totalBlocks;
        uint64  freeBlocks;
        uint64  rootDir;
        uint64  blockBitmap;
        char    name[kCheckSumFSNameLength];
        char    signature2[kCheckSumFSSignatureLength];
} _PACKED;


struct checksumfs_node {
        uint32  mode;                           // node type + permissions
        uint32  attributeType;          // attribute type (attributes only)
        uint32  uid;                            // owning user ID
        uint32  gid;                            // owning group ID
        uint64  creationTime;           // in ns since the epoche
        uint64  modificationTime;       //
        uint64  changeTime;                     //
        uint64  hardLinks;                      // number of references to the node
        uint64  size;                           // content size in bytes
        uint64  parentDirectory;        // block index of the parent directory
                                                                // (directories and attributes only)
        uint64  attributeDirectory;     // block index of the attribute directory (0 if
                                                                // empty)
} _PACKED;


static const uint32 kCheckSumFSMaxDirEntryTreeDepth             = 24;

struct checksumfs_dir_entry_tree {
        uint16  depth;
} _PACKED;


struct checksumfs_dir_entry_block {
        uint16  entryCount;
        uint16  nameEnds[0];            // end offsets of the names (relative to the
                                                                // start of the first name),
                                                                // e.g. nameEnds[0] == length of first name
        // char names[];                        // string of all (unterminated) names,
                                                                // directly follows the nameEnds array
        // ...
        // uint64       nodes[];
                // node array ends at the end of the block
};


#endif  // CHECK_SUM_FS_H