filesystem.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:12k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * filesystem.c: File system helpers
- *****************************************************************************
- * Copyright (C) 2005-2006 the VideoLAN team
- * Copyright © 2005-2008 Rémi Denis-Courmont
- *
- * Authors: Rémi Denis-Courmont <rem # videolan.org>
- *
- * 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.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_charset.h>
- #include "libvlc.h" /* utf8_mkdir */
- #include <vlc_rand.h>
- #include <assert.h>
- #include <stdio.h>
- #include <errno.h>
- #include <sys/types.h>
- #ifdef HAVE_DIRENT_H
- # include <dirent.h>
- #endif
- #ifdef UNDER_CE
- # include <tchar.h>
- #endif
- #ifdef HAVE_SYS_STAT_H
- # include <sys/stat.h>
- #endif
- #ifdef HAVE_FCNTL_H
- # include <fcntl.h>
- #endif
- #ifdef WIN32
- # include <io.h>
- # ifndef UNDER_CE
- # include <direct.h>
- # endif
- #else
- # include <unistd.h>
- #endif
- #ifndef HAVE_LSTAT
- # define lstat( a, b ) stat(a, b)
- #endif
- #ifdef WIN32
- static int convert_path (const char *restrict path, wchar_t *restrict wpath)
- {
- if (!MultiByteToWideChar (CP_UTF8, 0, path, -1, wpath, MAX_PATH))
- {
- errno = ENOENT;
- return -1;
- }
- wpath[MAX_PATH] = L' ';
- return 0;
- }
- # define CONVERT_PATH(path, wpath, err)
- wchar_t wpath[MAX_PATH+1];
- if (convert_path (path, wpath))
- return (err)
- #endif
- /**
- * Opens a system file handle.
- *
- * @param filename file path to open (with UTF-8 encoding)
- * @param flags open() flags, see the C library open() documentation
- * @param mode file permissions if creating a new file
- * @return a file handle on success, -1 on error (see errno).
- */
- int utf8_open (const char *filename, int flags, mode_t mode)
- {
- #ifdef UNDER_CE
- /*_open translates to wchar internally on WinCE*/
- return _open (filename, flags, mode);
- #elif defined (WIN32)
- /*
- * open() cannot open files with non-“ANSI” characters on Windows.
- * We use _wopen() instead. Same thing for mkdir() and stat().
- */
- CONVERT_PATH(filename, wpath, -1);
- return _wopen (wpath, flags, mode);
- #endif
- const char *local_name = ToLocale (filename);
- if (local_name == NULL)
- {
- errno = ENOENT;
- return -1;
- }
- int fd;
- #ifdef O_CLOEXEC
- fd = open (local_name, flags | O_CLOEXEC, mode);
- if (fd == -1 && errno == EINVAL)
- #endif
- {
- fd = open (local_name, flags, mode);
- #ifdef HAVE_FCNTL
- if (fd != -1)
- {
- int flags = fcntl (fd, F_GETFD);
- fcntl (fd, F_SETFD, FD_CLOEXEC | ((flags != -1) ? flags : 0));
- }
- #endif
- }
- LocaleFree (local_name);
- return fd;
- }
- /**
- * Opens a FILE pointer.
- * @param filename file path, using UTF-8 encoding
- * @param mode fopen file open mode
- * @return NULL on error, an open FILE pointer on success.
- */
- FILE *utf8_fopen (const char *filename, const char *mode)
- {
- int rwflags = 0, oflags = 0;
- bool append = false;
- for (const char *ptr = mode; *ptr; ptr++)
- {
- switch (*ptr)
- {
- case 'r':
- rwflags = O_RDONLY;
- break;
- case 'a':
- rwflags = O_WRONLY;
- oflags |= O_CREAT;
- append = true;
- break;
- case 'w':
- rwflags = O_WRONLY;
- oflags |= O_CREAT | O_TRUNC;
- break;
- case '+':
- rwflags = O_RDWR;
- break;
- #ifdef O_TEXT
- case 't':
- oflags |= O_TEXT;
- break;
- #endif
- }
- }
- int fd = utf8_open (filename, rwflags | oflags, 0666);
- if (fd == -1)
- return NULL;
- if (append && (lseek (fd, 0, SEEK_END) == -1))
- {
- close (fd);
- return NULL;
- }
- FILE *stream = fdopen (fd, mode);
- if (stream == NULL)
- close (fd);
- return stream;
- }
- /**
- * Creates a directory using UTF-8 paths.
- *
- * @param dirname a UTF-8 string with the name of the directory that you
- * want to create.
- * @param mode directory permissions
- * @return 0 on success, -1 on error (see errno).
- */
- int utf8_mkdir( const char *dirname, mode_t mode )
- {
- #if defined (UNDER_CE)
- (void) mode;
- /* mkdir converts internally to wchar */
- return _mkdir(dirname);
- #elif defined (WIN32)
- (void) mode;
- CONVERT_PATH (dirname, wpath, -1);
- return _wmkdir (wpath);
- #else
- char *locname = ToLocale( dirname );
- int res;
- if( locname == NULL )
- {
- errno = ENOENT;
- return -1;
- }
- res = mkdir( locname, mode );
- LocaleFree( locname );
- return res;
- #endif
- }
- /**
- * Opens a DIR pointer.
- *
- * @param dirname UTF-8 representation of the directory name
- * @return a pointer to the DIR struct, or NULL in case of error.
- * Release with standard closedir().
- */
- DIR *utf8_opendir( const char *dirname )
- {
- #ifdef WIN32
- CONVERT_PATH (dirname, wpath, NULL);
- return (DIR *)vlc_wopendir (wpath);
- #else
- const char *local_name = ToLocale( dirname );
- if( local_name != NULL )
- {
- DIR *dir = opendir( local_name );
- LocaleFree( local_name );
- return dir;
- }
- #endif
- errno = ENOENT;
- return NULL;
- }
- /**
- * Reads the next file name from an open directory.
- *
- * @param dir The directory that is being read
- *
- * @return a UTF-8 string of the directory entry.
- * Use free() to free this memory.
- */
- char *utf8_readdir( DIR *dir )
- {
- #ifdef WIN32
- struct _wdirent *ent = vlc_wreaddir (dir);
- if (ent == NULL)
- return NULL;
- return FromWide (ent->d_name);
- #else
- struct dirent *ent;
- ent = readdir( (DIR *)dir );
- if( ent == NULL )
- return NULL;
- return vlc_fix_readdir( ent->d_name );
- #endif
- }
- static int dummy_select( const char *str )
- {
- (void)str;
- return 1;
- }
- /**
- * Does the same as utf8_scandir(), but takes an open directory pointer
- * instead of a directory path.
- */
- int utf8_loaddir( DIR *dir, char ***namelist,
- int (*select)( const char * ),
- int (*compar)( const char **, const char ** ) )
- {
- if( select == NULL )
- select = dummy_select;
- if( dir == NULL )
- return -1;
- else
- {
- char **tab = NULL;
- char *entry;
- unsigned num = 0;
- rewinddir( dir );
- while( ( entry = utf8_readdir( dir ) ) != NULL )
- {
- char **newtab;
- if( !select( entry ) )
- {
- free( entry );
- continue;
- }
- newtab = realloc( tab, sizeof( char * ) * (num + 1) );
- if( newtab == NULL )
- {
- free( entry );
- goto error;
- }
- tab = newtab;
- tab[num++] = entry;
- }
- if( compar != NULL )
- qsort( tab, num, sizeof( tab[0] ),
- (int (*)( const void *, const void *))compar );
- *namelist = tab;
- return num;
- error:{
- unsigned i;
- for( i = 0; i < num; i++ )
- free( tab[i] );
- if( tab != NULL )
- free( tab );
- }
- }
- return -1;
- }
- /**
- * Selects file entries from a directory, as GNU C scandir().
- *
- * @param dirname UTF-8 diretory path
- * @param pointer [OUT] pointer set, on succesful completion, to the address
- * of a table of UTF-8 filenames. All filenames must be freed with free().
- * The table itself must be freed with free() as well.
- *
- * @return How many file names were selected (possibly 0),
- * or -1 in case of error.
- */
- int utf8_scandir( const char *dirname, char ***namelist,
- int (*select)( const char * ),
- int (*compar)( const char **, const char ** ) )
- {
- DIR *dir = utf8_opendir (dirname);
- int val = -1;
- if (dir != NULL)
- {
- val = utf8_loaddir (dir, namelist, select, compar);
- closedir (dir);
- }
- return val;
- }
- static int utf8_statEx( const char *filename, struct stat *buf,
- bool deref )
- {
- #ifdef UNDER_CE
- /*_stat translates to wchar internally on WinCE*/
- return _stat( filename, buf );
- #elif defined (WIN32)
- CONVERT_PATH (filename, wpath, -1);
- return _wstati64 (wpath, buf);
- #endif
- #ifdef HAVE_SYS_STAT_H
- const char *local_name = ToLocale( filename );
- if( local_name != NULL )
- {
- int res = deref ? stat( local_name, buf )
- : lstat( local_name, buf );
- LocaleFree( local_name );
- return res;
- }
- errno = ENOENT;
- #endif
- return -1;
- }
- /**
- * Finds file/inode informations, as stat().
- * Consider using fstat() instead, if possible.
- *
- * @param filename UTF-8 file path
- */
- int utf8_stat( const char *filename, struct stat *buf)
- {
- return utf8_statEx( filename, buf, true );
- }
- /**
- * Finds file/inode informations, as lstat().
- * Consider using fstat() instead, if possible.
- *
- * @param filename UTF-8 file path
- */
- int utf8_lstat( const char *filename, struct stat *buf)
- {
- return utf8_statEx( filename, buf, false );
- }
- /**
- * Removes a file.
- *
- * @param filename a UTF-8 string with the name of the file you want to delete.
- * @return A 0 return value indicates success. A -1 return value indicates an
- * error, and an error code is stored in errno
- */
- int utf8_unlink( const char *filename )
- {
- #ifdef UNDER_CE
- /*_open translates to wchar internally on WinCE*/
- return _unlink( filename );
- #elif defined (WIN32)
- CONVERT_PATH (filename, wpath, -1);
- return _wunlink (wpath);
- #endif
- const char *local_name = ToLocale( filename );
- if( local_name == NULL )
- {
- errno = ENOENT;
- return -1;
- }
- int ret = unlink( local_name );
- LocaleFree( local_name );
- return ret;
- }
- /**
- * Moves a file atomically. This only works within a single file system.
- *
- * @param oldpath path to the file before the move
- * @param newpath intended path to the file after the move
- * @return A 0 return value indicates success. A -1 return value indicates an
- * error, and an error code is stored in errno
- */
- int utf8_rename (const char *oldpath, const char *newpath)
- {
- #if defined (WIN32)
- CONVERT_PATH (oldpath, wold, -1);
- CONVERT_PATH (newpath, wnew, -1);
- # ifdef UNDER_CE
- /* FIXME: errno support */
- if (MoveFileW (wold, wnew))
- return 0;
- else
- return -1;
- #else
- return _wrename (wold, wnew);
- #endif
- #endif
- const char *lo = ToLocale (oldpath);
- if (lo == NULL)
- goto error;
- const char *ln = ToLocale (newpath);
- if (ln == NULL)
- {
- LocaleFree (lo);
- error:
- errno = ENOENT;
- return -1;
- }
- int ret = rename (lo, ln);
- LocaleFree (lo);
- LocaleFree (ln);
- return ret;
- }
- int utf8_mkstemp( char *template )
- {
- static const char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
- static const int i_digits = sizeof(digits)/sizeof(*digits) - 1;
- /* */
- assert( template );
- /* Check template validity */
- const size_t i_length = strlen( template );
- char *psz_rand = &template[i_length-6];
- if( i_length < 6 || strcmp( psz_rand, "XXXXXX" ) )
- {
- errno = EINVAL;
- return -1;
- }
- /* */
- for( int i = 0; i < 256; i++ )
- {
- /* Create a pseudo random file name */
- uint8_t pi_rand[6];
- vlc_rand_bytes( pi_rand, sizeof(pi_rand) );
- for( int j = 0; j < 6; j++ )
- psz_rand[j] = digits[pi_rand[j] % i_digits];
- /* */
- int fd = utf8_open( template, O_CREAT | O_EXCL | O_RDWR, 0600 );
- if( fd >= 0 )
- return fd;
- if( errno != EEXIST )
- return -1;
- }
- errno = EEXIST;
- return -1;
- }