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extfs_unix.cpp
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2000-01-21
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/*
* extfs_unix.cpp - MacOS file system for access native file system access, Unix specific stuff
*
* Basilisk II (C) 1997-1999 Christian Bauer
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include "sysdeps.h"
#include "extfs.h"
#include "extfs_defs.h"
#define DEBUG 0
#include "debug.h"
// Default Finder flags
const uint16 DEFAULT_FINDER_FLAGS = kHasBeenInited;
/*
* Initialization
*/
void extfs_init(void)
{
}
/*
* Deinitialization
*/
void extfs_exit(void)
{
}
/*
* Add component to path name
*/
void add_path_component(char *path, const char *component)
{
int l = strlen(path);
if (l < MAX_PATH_LENGTH-1 && path[l-1] != '/') {
path[l] = '/';
path[l+1] = 0;
}
strncat(path, component, MAX_PATH_LENGTH-1);
}
/*
* Finder info and resource forks are kept in helper files
*
* Finder info:
* /path/.finf/file
* Resource fork:
* /path/.rsrc/file
*/
// Layout of Finder info helper files (all fields big-endian)
struct finf_struct {
uint32 type;
uint32 creator;
uint16 flags;
uint8 pad0[22]; // total size: 32 bytes to match the size of FInfo+FXInfo
};
static void make_helper_path(const char *src, char *dest, const char *add, bool only_dir = false)
{
dest[0] = 0;
// Get pointer to last component of path
const char *last_part = strrchr(src, '/');
if (last_part)
last_part++;
else
last_part = src;
// Copy everything before
strncpy(dest, src, last_part-src);
dest[last_part-src] = 0;
// Add additional component
strncat(dest, add, MAX_PATH_LENGTH-1);
// Add last component
if (!only_dir)
strncat(dest, last_part, MAX_PATH_LENGTH-1);
}
static int create_helper_dir(const char *path, const char *add)
{
char helper_dir[MAX_PATH_LENGTH];
make_helper_path(path, helper_dir, add, true);
return mkdir(helper_dir, 0777);
}
static int open_helper(const char *path, const char *add, int flag)
{
char helper_path[MAX_PATH_LENGTH];
make_helper_path(path, helper_path, add);
if ((flag & O_ACCMODE) == O_RDWR || (flag & O_ACCMODE) == O_WRONLY)
flag |= O_CREAT;
int fd = open(helper_path, flag, 0666);
if (fd < 0) {
if (errno == ENOENT && (flag & O_CREAT)) {
// One path component was missing, probably the helper
// directory. Try to create it and re-open the file.
int ret = create_helper_dir(path, add);
if (ret < 0)
return ret;
fd = open(helper_path, flag, 0666);
}
}
return fd;
}
static int open_finf(const char *path, int flag)
{
return open_helper(path, ".finf/", flag);
}
static int open_rsrc(const char *path, int flag)
{
return open_helper(path, ".rsrc/", flag);
}
/*
* Get/set finder type/creator for file specified by full path
*/
struct ext2type {
const char *ext;
uint32 type;
uint32 creator;
};
static const ext2type e2t_translation[] = {
{".Z", 'ZIVM', 'LZIV'},
{".gz", 'Gzip', 'Gzip'},
{".hqx", 'TEXT', 'SITx'},
{".pdf", 'PDF ', 'CARO'},
{".ps", 'TEXT', 'ttxt'},
{".sit", 'SIT!', 'SITx'},
{".tar", 'TARF', 'TAR '},
{".uu", 'TEXT', 'SITx'},
{".uue", 'TEXT', 'SITx'},
{".zip", 'ZIP ', 'ZIP '},
{".8svx", '8SVX', 'SNDM'},
{".aifc", 'AIFC', 'TVOD'},
{".aiff", 'AIFF', 'TVOD'},
{".au", 'ULAW', 'TVOD'},
{".mid", 'MIDI', 'TVOD'},
{".midi", 'MIDI', 'TVOD'},
{".mp2", 'MPG ', 'TVOD'},
{".mp3", 'MPG ', 'TVOD'},
{".wav", 'WAVE', 'TVOD'},
{".bmp", 'BMPf', 'ogle'},
{".gif", 'GIFf', 'ogle'},
{".lbm", 'ILBM', 'GKON'},
{".ilbm", 'ILBM', 'GKON'},
{".jpg", 'JPEG', 'ogle'},
{".jpeg", 'JPEG', 'ogle'},
{".pict", 'PICT', 'ogle'},
{".png", 'PNGf', 'ogle'},
{".sgi", '.SGI', 'ogle'},
{".tga", 'TPIC', 'ogle'},
{".tif", 'TIFF', 'ogle'},
{".tiff", 'TIFF', 'ogle'},
{".html", 'TEXT', 'MOSS'},
{".txt", 'TEXT', 'ttxt'},
{".rtf", 'TEXT', 'MSWD'},
{".c", 'TEXT', 'R*ch'},
{".C", 'TEXT', 'R*ch'},
{".cc", 'TEXT', 'R*ch'},
{".cpp", 'TEXT', 'R*ch'},
{".cxx", 'TEXT', 'R*ch'},
{".h", 'TEXT', 'R*ch'},
{".hh", 'TEXT', 'R*ch'},
{".hpp", 'TEXT', 'R*ch'},
{".hxx", 'TEXT', 'R*ch'},
{".s", 'TEXT', 'R*ch'},
{".S", 'TEXT', 'R*ch'},
{".i", 'TEXT', 'R*ch'},
{".mpg", 'MPEG', 'TVOD'},
{".mpeg", 'MPEG', 'TVOD'},
{".mov", 'MooV', 'TVOD'},
{".fli", 'FLI ', 'TVOD'},
{".avi", 'VfW ', 'TVOD'},
{NULL, 0, 0} // End marker
};
void get_finder_type(const char *path, uint32 &type, uint32 &creator)
{
type = 0;
creator = 0;
// Open Finder info file
int fd = open_finf(path, O_RDONLY);
if (fd >= 0) {
// Read file
finf_struct finf;
if (read(fd, &finf, sizeof(finf_struct)) >= 8) {
// Type/creator are in Finder info file, return them
type = ntohl(finf.type);
creator = ntohl(finf.creator);
close(fd);
return;
}
close(fd);
}
// No Finder info file, translate file name extension to MacOS type/creator
int path_len = strlen(path);
for (int i=0; e2t_translation[i].ext; i++) {
int ext_len = strlen(e2t_translation[i].ext);
if (path_len < ext_len)
continue;
if (!strcmp(path + path_len - ext_len, e2t_translation[i].ext)) {
type = e2t_translation[i].type;
creator = e2t_translation[i].creator;
break;
}
}
}
void set_finder_type(const char *path, uint32 type, uint32 creator)
{
// Open Finder info file
int fd = open_finf(path, O_RDWR);
if (fd < 0)
return;
// Read file
finf_struct finf;
finf.flags = DEFAULT_FINDER_FLAGS;
memset(&finf, 0, sizeof(finf_struct));
read(fd, &finf, sizeof(finf_struct));
// Set Finder flags
finf.type = htonl(type);
finf.creator = htonl(creator);
// Update file
lseek(fd, 0, SEEK_SET);
write(fd, &finf, sizeof(finf_struct));
close(fd);
}
/*
* Get/set finder flags for file/dir specified by full path
*/
void get_finder_flags(const char *path, uint16 &flags)
{
flags = DEFAULT_FINDER_FLAGS; // Default
// Open Finder info file
int fd = open_finf(path, O_RDONLY);
if (fd < 0)
return;
// Read Finder flags
finf_struct finf;
if (read(fd, &finf, sizeof(finf_struct)) >= 10)
flags = ntohs(finf.flags);
// Close file
close(fd);
}
void set_finder_flags(const char *path, uint16 flags)
{
// Open Finder info file
int fd = open_finf(path, O_RDWR);
if (fd < 0)
return;
// Read file
finf_struct finf;
memset(&finf, 0, sizeof(finf_struct));
finf.flags = DEFAULT_FINDER_FLAGS;
read(fd, &finf, sizeof(finf_struct));
// Set Finder flags
finf.flags = htons(flags);
// Update file
lseek(fd, 0, SEEK_SET);
write(fd, &finf, sizeof(finf_struct));
close(fd);
}
/*
* Resource fork emulation functions
*/
uint32 get_rfork_size(const char *path)
{
// Open resource file
int fd = open_rsrc(path, O_RDONLY);
if (fd < 0)
return 0;
// Get size
off_t size = lseek(fd, 0, SEEK_END);
// Close file and return size
close(fd);
return size < 0 ? 0 : size;
}
int open_rfork(const char *path, int flag)
{
return open_rsrc(path, flag);
}
void close_rfork(const char *path, int fd)
{
close(fd);
}
/*
* Read "length" bytes from file to "buffer",
* returns number of bytes read (or -1 on error)
*/
ssize_t extfs_read(int fd, void *buffer, size_t length)
{
return read(fd, buffer, length);
}
/*
* Write "length" bytes from "buffer" to file,
* returns number of bytes written (or -1 on error)
*/
ssize_t extfs_write(int fd, void *buffer, size_t length)
{
return write(fd, buffer, length);
}
/*
* Remove file/directory (and associated helper files),
* returns false on error (and sets errno)
*/
bool extfs_remove(const char *path)
{
// Remove helpers first, don't complain if this fails
char helper_path[MAX_PATH_LENGTH];
make_helper_path(path, helper_path, ".finf/", false);
remove(helper_path);
make_helper_path(path, helper_path, ".rsrc/", false);
remove(helper_path);
// Now remove file or directory (and helper directories in the directory)
if (remove(path) < 0) {
if (errno == EISDIR || errno == ENOTEMPTY) {
helper_path[0] = 0;
strncpy(helper_path, path, MAX_PATH_LENGTH-1);
add_path_component(helper_path, ".finf");
rmdir(helper_path);
helper_path[0] = 0;
strncpy(helper_path, path, MAX_PATH_LENGTH-1);
add_path_component(helper_path, ".rsrc");
rmdir(helper_path);
return rmdir(path) == 0;
} else
return false;
}
return true;
}
/*
* Rename/move file/directory (and associated helper files),
* returns false on error (and sets errno)
*/
bool extfs_rename(const char *old_path, const char *new_path)
{
// Rename helpers first, don't complain if this fails
char old_helper_path[MAX_PATH_LENGTH], new_helper_path[MAX_PATH_LENGTH];
make_helper_path(old_path, old_helper_path, ".finf/", false);
make_helper_path(new_path, new_helper_path, ".finf/", false);
create_helper_dir(new_path, ".finf/");
rename(old_helper_path, new_helper_path);
make_helper_path(old_path, old_helper_path, ".rsrc/", false);
make_helper_path(new_path, new_helper_path, ".rsrc/", false);
create_helper_dir(new_path, ".rsrc/");
rename(old_helper_path, new_helper_path);
// Now rename file
return rename(old_path, new_path) == 0;
}