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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* dir_iterator.h
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef IO_DIR_ITERATOR_H
#define IO_DIR_ITERATOR_H
#include "sqfs/dir_entry.h"
#include "sqfs/predef.h"
/**
* @interface sqfs_dir_iterator_t
*
* @brief An iterator over entries in a filesystem directory.
*/
typedef struct sqfs_dir_iterator_t {
sqfs_object_t obj;
/**
* @brief Read the next entry and update internal state relating to it
*
* @param it A pointer to the iterator itself
* @param out Returns a pointer to an entry on success
*
* @return Zero on success, postivie value if the end of the list was
* reached, negative @ref SQFS_ERROR value on failure.
*/
int (*next)(struct sqfs_dir_iterator_t *it, sqfs_dir_entry_t **out);
/**
* @brief If the last entry was a symlink, extract the target path
*
* @param it A pointer to the iterator itself.
* @param out Returns a pointer to a string on success. Has to be
* released with free().
*
* @return Zero on success, negative @ref SQFS_ERROR value on failure.
*/
int (*read_link)(struct sqfs_dir_iterator_t *it, char **out);
/**
* @brief If the last entry was a directory, open it.
*
* If next() returned a directory, this can be used to create a brand
* new sqfs_dir_iterator_t for it, that is independent of the current
* one and returns the sub-directories entries.
*
* @param it A pointer to the iterator itself.
* @param out Returns a pointer to a directory iterator on success.
*
* @return Zero on success, negative @ref SQFS_ERROR value on failure.
*/
int (*open_subdir)(struct sqfs_dir_iterator_t *it,
struct sqfs_dir_iterator_t **out);
/**
* @brief Skip a sub-hierarchy on a stacked iterator
*
* If an iterator would ordinarily recurse into a sub-directory,
* tell it to skip those entries. On simple, flag iterators like the
* one returned by @ref dir_iterator_create, this has no effect.
*
* @param it A pointer to the iterator itself.
*/
void (*ignore_subdir)(struct sqfs_dir_iterator_t *it);
/**
* @brief If the last entry was a regular file, open it.
*
* If next() returned a file, this can be used to create an istream
* to read from it.
*
* @param it A pointer to the iterator itself.
* @param out Returns a pointer to a @ref sqfs_istream_t on success.
*
* @return Zero on success, negative @ref SQFS_ERROR value on failure.
*/
int (*open_file_ro)(struct sqfs_dir_iterator_t *it,
sqfs_istream_t **out);
/**
* @brief Read extended attributes associated with the current entry
*
* @param it A pointer to the iterator itself.
* @param out Returns a linked list of xattr entries.
*
* @return Zero on success, negative @ref SQFS_ERROR value on failure.
*/
int (*read_xattr)(struct sqfs_dir_iterator_t *it, sqfs_xattr_t **out);
} sqfs_dir_iterator_t;
enum {
DIR_SCAN_NO_SOCK = 0x0001,
DIR_SCAN_NO_SLINK = 0x0002,
DIR_SCAN_NO_FILE = 0x0004,
DIR_SCAN_NO_BLK = 0x0008,
DIR_SCAN_NO_DIR = 0x0010,
DIR_SCAN_NO_CHR = 0x0020,
DIR_SCAN_NO_FIFO = 0x0040,
DIR_SCAN_KEEP_TIME = 0x0100,
DIR_SCAN_KEEP_UID = 0x0200,
DIR_SCAN_KEEP_GID = 0x0400,
DIR_SCAN_KEEP_MODE = 0x0800,
DIR_SCAN_ONE_FILESYSTEM = 0x1000,
DIR_SCAN_NO_RECURSION = 0x2000,
DIR_SCAN_MATCH_FULL_PATH = 0x4000,
};
typedef struct {
sqfs_u32 flags;
sqfs_u32 def_uid;
sqfs_u32 def_gid;
sqfs_u32 def_mode;
sqfs_s64 def_mtime;
/**
* @brief A prefix to attach to all returend paths
*
* If not null, this string and an additional "/" are prepended to
* all entries returned by the iterator.
*/
const char *prefix;
/**
* @brief A glob pattern that either the name must match
*
* If this is not NULL, only paths that match this globbing pattern
* are returned. If the flag DIR_SCAN_MATCH_FULL_PATH is set, the
* entire path must match, slashes cannot match wild card characters.
* If not set, only the last part of the path is tested. The iterator
* still recurses into directories, it simply doesn't report them if
* they don't match.
*/
const char *name_pattern;
} dir_tree_cfg_t;
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Construct a simple directory iterator given a path
*
* On systems with encoding aware file I/O (like Windows), the path is
* interpreted to be UTF-8 encoded and converted to the native system API
* encoding to open the directory. For each directory entry, the name in
* the native encoding is converted back to UTF-8 when reading.
*
* The implementation returned by this is simple, non-recursive, reporting
* directory contents as returned by the OS native API, i.e. not sorted,
* and including the "." and ".." entries.
*
* @param path A path to a directory on the file system.
*
* @return A pointer to a sqfs_dir_iterator_t implementation on success,
* NULL on error (message is printed to stderr).
*/
SQFS_INTERNAL sqfs_dir_iterator_t *dir_iterator_create(const char *path);
/**
* @brief Create a stacked, recursive directory tree iterator
*
* The underlying implementation automatically recurses into sub directories
* and returns a flattened list of entries, where each entry represents a full
* path. Advanced filtering, path pre-fixing et cetera can be configured.
* The typical "." and ".." entries are filtered out as well.
*
* @param path A path to a directory on the file system.
* @param cfg A @ref dir_tree_cfg_t filtering configuration.
*
* @return A pointer to a sqfs_dir_iterator_t implementation on success,
* NULL on error (message is printed to stderr).
*/
SQFS_INTERNAL
sqfs_dir_iterator_t *dir_tree_iterator_create(const char *path,
const dir_tree_cfg_t *cfg);
#ifdef __cplusplus
}
#endif
#endif /* IO_DIR_ITERATOR_H */
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