blender-archive/source/blender/blenlib/BLI_fileops.h

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup bli
 * \brief File and directory operations.
 */

#pragma once

#include <stdint.h>
#include <stdio.h>
#include <sys/stat.h>

/* for size_t (needed on windows) */
#include <stddef.h>

#include <limits.h> /* for PATH_MAX */

#include "BLI_compiler_attrs.h"
#include "BLI_fileops_types.h"
#include "BLI_utildefines.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifndef PATH_MAX
#  define PATH_MAX 4096
#endif

/* -------------------------------------------------------------------- */
/** \name Common
 * \{ */

/**
 * Returns the st_mode from stat-ing the specified path name, or 0 if stat fails
 * (most likely doesn't exist or no access).
 */
int BLI_exists(const char *path) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
int BLI_copy(const char *file, const char *to) ATTR_NONNULL();
/**
 * \return zero on success (matching 'rename' behavior).
 */
int BLI_rename(const char *from, const char *to) ATTR_NONNULL();
/**
 * Deletes the specified file or directory (depending on dir), optionally
 * doing recursive delete of directory contents.
 *
 * \return zero on success (matching 'remove' behavior).
 */
int BLI_delete(const char *file, bool dir, bool recursive) ATTR_NONNULL();
/**
 * Soft deletes the specified file or directory (depending on dir) by moving the files to the
 * recycling bin, optionally doing recursive delete of directory contents.
 *
 * \return zero on success (matching 'remove' behavior).
 */
int BLI_delete_soft(const char *file, const char **error_message) ATTR_NONNULL();
#if 0 /* Unused */
int BLI_move(const char *path, const char *to) ATTR_NONNULL();
int BLI_create_symlink(const char *path, const char *to) ATTR_NONNULL();
#endif

/* Keep in sync with the definition of struct `direntry` in `BLI_fileops_types.h`. */
#ifdef WIN32
#  if defined(_MSC_VER)
typedef struct _stat64 BLI_stat_t;
#  else
typedef struct _stat BLI_stat_t;
#  endif
#else
typedef struct stat BLI_stat_t;
#endif

int BLI_fstat(int fd, BLI_stat_t *buffer) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
int BLI_stat(const char *path, BLI_stat_t *buffer) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
int64_t BLI_ftell(FILE *stream) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
int BLI_fseek(FILE *stream, int64_t offset, int whence);
int64_t BLI_lseek(int fd, int64_t offset, int whence);

#ifdef WIN32
int BLI_wstat(const wchar_t *path, BLI_stat_t *buffer);
#endif

typedef enum eFileAttributes {
  FILE_ATTR_READONLY = 1 << 0,        /* Read-only or Immutable. */
  FILE_ATTR_HIDDEN = 1 << 1,          /* Hidden or invisible. */
  FILE_ATTR_SYSTEM = 1 << 2,          /* Used by the Operating System. */
  FILE_ATTR_ARCHIVE = 1 << 3,         /* Marked as archived. */
  FILE_ATTR_COMPRESSED = 1 << 4,      /* Compressed. */
  FILE_ATTR_ENCRYPTED = 1 << 5,       /* Encrypted. */
  FILE_ATTR_RESTRICTED = 1 << 6,      /* Protected by OS. */
  FILE_ATTR_TEMPORARY = 1 << 7,       /* Used for temporary storage. */
  FILE_ATTR_SPARSE_FILE = 1 << 8,     /* Sparse File. */
  FILE_ATTR_OFFLINE = 1 << 9,         /* Contents available after a short delay. */
  FILE_ATTR_ALIAS = 1 << 10,          /* Mac Alias or Windows LNK. File-based redirection. */
  FILE_ATTR_REPARSE_POINT = 1 << 11,  /* File has associated re-parse point. */
  FILE_ATTR_SYMLINK = 1 << 12,        /* Reference to another file. */
  FILE_ATTR_JUNCTION_POINT = 1 << 13, /* Folder Symbolic-link. */
  FILE_ATTR_MOUNT_POINT = 1 << 14,    /* Volume mounted as a folder. */
  FILE_ATTR_HARDLINK = 1 << 15,       /* Duplicated directory entry. */
} eFileAttributes;

#define FILE_ATTR_ANY_LINK \
  (FILE_ATTR_ALIAS | FILE_ATTR_REPARSE_POINT | FILE_ATTR_SYMLINK | FILE_ATTR_JUNCTION_POINT | \
   FILE_ATTR_MOUNT_POINT | FILE_ATTR_HARDLINK)

/** \} */

/* -------------------------------------------------------------------- */
/** \name Directories
 * \{ */

struct direntry;

/**
 * Does the specified path point to a directory?
 * \note Would be better in `fileops.c` except that it needs `stat.h` so add here.
 */
bool BLI_is_dir(const char *path) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
/**
 * Does the specified path point to a non-directory?
 */
bool BLI_is_file(const char *path) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
/**
 * \return true on success (i.e. given path now exists on FS), false otherwise.
 */
bool BLI_dir_create_recursive(const char *dir) ATTR_NONNULL();
/**
 * Returns the number of free bytes on the volume containing the specified pathname.
 *
 * \note Not actually used anywhere.
 */
double BLI_dir_free_space(const char *dir) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
/**
 * Copies the current working directory into *dir (max size maxncpy), and
 * returns a pointer to same.
 *
 * \note can return NULL when the size is not big enough
 */
char *BLI_current_working_dir(char *dir, size_t maxncpy) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
eFileAttributes BLI_file_attributes(const char *path);

/** \} */

/* -------------------------------------------------------------------- */
/** \name File-List
 * \{ */

/**
 * Scans the contents of the directory named *dirname, and allocates and fills in an
 * array of entries describing them in *filelist.
 *
 * \return The length of filelist array.
 */
unsigned int BLI_filelist_dir_contents(const char *dir, struct direntry **r_filelist);
/**
 * Deep-duplicate of a single direntry.
 */
void BLI_filelist_entry_duplicate(struct direntry *dst, const struct direntry *src);
/**
 * Deep-duplicate of a #direntry array including the array itself.
 */
void BLI_filelist_duplicate(struct direntry **dest_filelist,
                            struct direntry *const src_filelist,
                            unsigned int nrentries);
/**
 * Frees storage for a single direntry, not the direntry itself.
 */
void BLI_filelist_entry_free(struct direntry *entry);
/**
 * Frees storage for an array of #direntry, including the array itself.
 */
void BLI_filelist_free(struct direntry *filelist, unsigned int nrentries);

/**
 * Convert given entry's size into human-readable strings.
 */
void BLI_filelist_entry_size_to_string(const struct stat *st,
                                       uint64_t sz,
                                       bool compact,
                                       char r_size[FILELIST_DIRENTRY_SIZE_LEN]);
/**
 * Convert given entry's modes into human-readable strings.
 */
void BLI_filelist_entry_mode_to_string(const struct stat *st,
                                       bool compact,
                                       char r_mode1[FILELIST_DIRENTRY_MODE_LEN],
                                       char r_mode2[FILELIST_DIRENTRY_MODE_LEN],
                                       char r_mode3[FILELIST_DIRENTRY_MODE_LEN]);
/**
 * Convert given entry's owner into human-readable strings.
 */
void BLI_filelist_entry_owner_to_string(const struct stat *st,
                                        bool compact,
                                        char r_owner[FILELIST_DIRENTRY_OWNER_LEN]);
/**
 * Convert given entry's time into human-readable strings.
 *
 * \param r_is_today: optional, returns true if the date matches today's.
 * \param r_is_yesterday: optional, returns true if the date matches yesterday's.
 */
void BLI_filelist_entry_datetime_to_string(const struct stat *st,
                                           int64_t ts,
                                           bool compact,
                                           char r_time[FILELIST_DIRENTRY_TIME_LEN],
                                           char r_date[FILELIST_DIRENTRY_DATE_LEN],
                                           bool *r_is_today,
                                           bool *r_is_yesterday);

/** \} */

/* -------------------------------------------------------------------- */
/** \name Files
 * \{ */

FILE *BLI_fopen(const char *filename, const char *mode) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
void *BLI_gzopen(const char *filename, const char *mode) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
int BLI_open(const char *filename, int oflag, int pmode) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
int BLI_access(const char *filename, int mode) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();

/**
 * Returns true if the file with the specified name can be written.
 * This implementation uses access(2), which makes the check according
 * to the real UID and GID of the process, not its effective UID and GID.
 * This shouldn't matter for Blender, which is not going to run privileged anyway.
 */
bool BLI_file_is_writable(const char *file) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
/**
 * Creates the file with nothing in it, or updates its last-modified date if it already exists.
 * Returns true if successful (like the unix touch command).
 */
bool BLI_file_touch(const char *file) ATTR_NONNULL();
bool BLI_file_alias_target(const char *filepath, char *r_targetpath) ATTR_WARN_UNUSED_RESULT;

bool BLI_file_magic_is_gzip(const char header[4]);

size_t BLI_file_zstd_from_mem_at_pos(void *buf,
                                     size_t len,
                                     FILE *file,
                                     size_t file_offset,
                                     int compression_level) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
size_t BLI_file_unzstd_to_mem_at_pos(void *buf, size_t len, FILE *file, size_t file_offset)
    ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
bool BLI_file_magic_is_zstd(const char header[4]);

/**
 * Returns the file size of an opened file descriptor.
 */
size_t BLI_file_descriptor_size(int file) ATTR_WARN_UNUSED_RESULT;
/**
 * Returns the size of a file.
 */
size_t BLI_file_size(const char *path) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();

/**
 * Compare if one was last modified before the other.
 *
 * \return true when is `file1` older than `file2`.
 */
bool BLI_file_older(const char *file1, const char *file2) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();

/**
 * Reads the contents of a text file.
 *
 * \return the lines in a linked list (an empty list when file reading fails).
 */
struct LinkNode *BLI_file_read_as_lines(const char *file) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
void *BLI_file_read_text_as_mem(const char *filepath, size_t pad_bytes, size_t *r_size);
/**
 * Return the text file data with:

 * - Newlines replaced with '\0'.
 * - Optionally trim white-space, replacing trailing <space> & <tab> with '\0'.
 *
 * This is an alternative to using #BLI_file_read_as_lines,
 * allowing us to loop over lines without converting it into a linked list
 * with individual allocations.
 *
 * \param trim_trailing_space: Replace trailing spaces & tabs with nil.
 * This arguments prevents the caller from counting blank lines (if that's important).
 * \param pad_bytes: When this is non-zero, the first byte is set to nil,
 * to simplify parsing the file.
 * It's recommended to pass in 1, so all text is nil terminated.
 *
 * Example looping over lines:
 *
 * \code{.c}
 * size_t data_len;
 * char *data = BLI_file_read_text_as_mem_with_newline_as_nil(filepath, true, 1, &data_len);
 * char *data_end = data + data_len;
 * for (char *line = data; line != data_end; line = strlen(line) + 1) {
 *  printf("line='%s'\n", line);
 * }
 * \endcode
 */
void *BLI_file_read_text_as_mem_with_newline_as_nil(const char *filepath,
                                                    bool trim_trailing_space,
                                                    size_t pad_bytes,
                                                    size_t *r_size);
void *BLI_file_read_binary_as_mem(const char *filepath, size_t pad_bytes, size_t *r_size);
/**
 * Frees memory from a previous call to #BLI_file_read_as_lines.
 */
void BLI_file_free_lines(struct LinkNode *lines);

#ifdef __APPLE__
/**
 * Expand the leading `~` in the given path to `/Users/$USER`.
 * This doesn't preserve the trailing path separator.
 * Giving a path without leading `~` is not an error.
 */
const char *BLI_expand_tilde(const char *path_with_tilde);
#endif
/* This weirdo pops up in two places. */
#if !defined(WIN32)
#  ifndef O_BINARY
#    define O_BINARY 0
#  endif
#else
void BLI_get_short_name(char short_name[256], const char *filename);
#endif

/** \} */

#ifdef __cplusplus
}
#endif