/*
   Bacula(R) - The Network Backup Solution

   Copyright (C) 2000-2017 Kern Sibbald

   The original author of Bacula is Kern Sibbald, with contributions
   from many others, a complete list can be found in the file AUTHORS.

   You may use this file and others of this release according to the
   license defined in the LICENSE file, which includes the Affero General
   Public License, v3.0 ("AGPLv3") and some additional permissions and
   terms pursuant to its AGPLv3 Section 7.

   This notice must be preserved when any source code is 
   conveyed and/or propagated.

   Bacula(R) is a registered trademark of Kern Sibbald.
*/
/*
 * Directory tree build/traverse routines
 *
 *    Kern Sibbald, June MMII
 *
*/

#include "htable.h"

struct s_mem {
   struct s_mem *next;                /* next buffer */
   int rem;                           /* remaining bytes */
   char *mem;                         /* memory pointer */
   char first[1];                     /* first byte */
};

#define USE_DLIST

#define foreach_child(var, list) \
    for((var)=NULL; (*((TREE_NODE **)&(var))=(TREE_NODE*)(list->child.next(var))); )

#define tree_node_has_child(node) \
        ((node)->child.size() > 0)

#define first_child(node) \
        ((TREE_NODE *)(node->child.first())

struct delta_list {
   struct delta_list *next;
   JobId_t JobId;
   int32_t FileIndex;
};

/*
 * Keep this node as small as possible because
 *   there is one for each file.
 */
struct s_tree_node {
   /* KEEP sibling as the first member to avoid having to
    *  do initialization of child */
   rblink sibling;
   rblist child;
   char *fname;                       /* file name */
   int32_t FileIndex;                 /* file index */
   uint32_t JobId;                    /* JobId */
   int32_t delta_seq;                 /* current delta sequence */
   uint16_t fname_len;                /* filename length */
   int type: 8;                       /* node type */
   unsigned int extract: 1;           /* extract item */
   unsigned int extract_dir: 1;       /* extract dir entry only */
   unsigned int hard_link: 1;         /* set if have hard link */
   unsigned int soft_link: 1;         /* set if is soft link */
   unsigned int inserted: 1;          /* set when node newly inserted */
   unsigned int loaded: 1;            /* set when the dir is in the tree */
   unsigned int can_access: 1;        /* Can access to this node */
   struct s_tree_node *parent;
   struct s_tree_node *next;          /* next hash of FileIndex */
   struct delta_list *delta_list;     /* delta parts for this node */
};
typedef struct s_tree_node TREE_NODE;

struct s_tree_root {
   /* KEEP sibling as the first member to avoid having to
    *  do initialization of child */
   rblink sibling;
   rblist child;
   const char *fname;                 /* file name */
   int32_t FileIndex;                 /* file index */
   uint32_t JobId;                    /* JobId */
   int32_t delta_seq;                 /* current delta sequence */
   uint16_t fname_len;                /* filename length */
   unsigned int type: 8;              /* node type */
   unsigned int extract: 1;           /* extract item */
   unsigned int extract_dir: 1;       /* extract dir entry only */
   unsigned int hard_link: 1;         /* set if have hard link */
   unsigned int soft_link: 1;         /* set if is soft link */
   unsigned int inserted: 1;          /* set when newly inserted */
   unsigned int loaded: 1;            /* set when the dir is in the tree */
   unsigned int can_access: 1;        /* Can access to this node */
   struct s_tree_node *parent;
   struct s_tree_node *next;          /* next hash of FileIndex */
   struct delta_list *delta_list;     /* delta parts for this node */

   /* The above ^^^ must be identical to a TREE_NODE structure */
   struct s_tree_node *first;         /* first entry in the tree */
   struct s_tree_node *last;          /* last entry in tree */
   struct s_mem *mem;                 /* tree memory */
   uint32_t total_size;               /* total bytes allocated */
   uint32_t blocks;                   /* total mallocs */
   int cached_path_len;               /* length of cached path */
   char *cached_path;                 /* cached current path */
   TREE_NODE *cached_parent;          /* cached parent for above path */
   htable hardlinks;                  /* references to first occurrence of hardlinks */
};
typedef struct s_tree_root TREE_ROOT;

/* hardlink hashtable entry */
struct s_hl_entry {
   uint64_t key;
   hlink link;
   TREE_NODE *node;
};
typedef struct s_hl_entry HL_ENTRY;

/* type values */
#define TN_ROOT    1                  /* root node */
#define TN_NEWDIR  2                  /* created directory to fill path */
#define TN_DIR     3                  /* directory entry */
#define TN_DIR_NLS 4                  /* directory -- no leading slash -- win32 */
#define TN_FILE    5                  /* file entry */

/* External interface */
TREE_ROOT *new_tree(int count);
TREE_NODE *insert_tree_node(char *path, char *fname, int type,
                            TREE_ROOT *root, TREE_NODE *parent);
TREE_NODE *make_tree_path(char *path, TREE_ROOT *root);
TREE_NODE *tree_cwd(char *path, TREE_ROOT *root, TREE_NODE *node);
TREE_NODE *tree_relcwd(char *path, TREE_ROOT *root, TREE_NODE *node);
void tree_add_delta_part(TREE_ROOT *root, TREE_NODE *node,
                         JobId_t JobId, int32_t FileIndex);
void free_tree(TREE_ROOT *root);
int tree_getpath(TREE_NODE *node, char *buf, int buf_size);
void tree_remove_node(TREE_ROOT *root, TREE_NODE *node);

/*
 * Use the following for traversing the whole tree. It will be
 *   traversed in the order the entries were inserted into the
 *   tree.
 */
#define first_tree_node(r) (r)->first
#define next_tree_node(n)  (n)->next
