Partial implementation of sparsebundles; still needs Info.plist parsing

BasiliskII/src/Unix/disk_sparsebundle.cpp

@@ -0,0 +1,154 @@
+/*
+ *  disk_sparsebundle.cpp - Apple sparse bundle implementation
+ *
+ *  Basilisk II (C) Dave Vasilevsky
+ *
+ *  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 "disk_unix.h"
+
+#include <limits.h>
+ 
+// TODO
+// - Factory needs to actually check stuff
+// - Add to basilisk build
+// - Add to 'make links'
+
+typedef ssize_t (band_func)(int fd, void *buf, size_t len);
+
+static ssize_t band_read(int fd, void *buf, size_t len) {
+	ssize_t err = (fd == -1 ? 0 : ::read(fd, buf, len));
+	if (err == -1)
+		return err;
+	if (err < len)
+		memset((char*)buf + err, 0, len - err);
+	return len;
+}
+
+static ssize_t band_write(int fd, void *buf, size_t len) {
+	return ::write(fd, buf, len);
+}
+
+struct disk_sparsebundle : disk_generic {
+	disk_sparsebundle(char *bands, int fd, bool read_only, loff_t band_size,
+			loff_t total_size)
+	: token_fd(fd), read_only(read_only), band_size(band_size),
+			total_size(total_size), band_dir(bands), band_cur(-1), band_fd(0) {
+	}
+	
+	virtual ~disk_sparsebundle() {
+		if (band_fd)
+			close(band_fd);
+		close(token_fd);
+		free(band_dir);
+	}
+	
+	virtual bool is_read_only() { return read_only; }
+	virtual loff_t size() { return total_size; }
+	
+	virtual size_t read(void *buf, loff_t offset, size_t length) {
+		return band_do(&band_read, buf, offset, length);
+	}
+	
+	virtual size_t write(void *buf, loff_t offset, size_t length) {
+		return band_do(&band_write, buf, offset, length);
+	}
+	
+protected:
+	int token_fd;
+	bool read_only;
+	loff_t band_size, total_size;
+	char *band_dir;
+	
+	loff_t band_cur;
+	int band_fd;
+	
+	size_t band_do(band_func func, void *buf, loff_t offset, size_t length) {
+		char *b = (char*)buf;
+		loff_t band = offset / band_size;
+		size_t done = 0;
+		while (length) {
+			if (!open_band(band))
+				break;
+			
+			size_t start = offset % band_size;
+			size_t segment = band_size - start;
+			if (segment > length)
+				segment = length;
+			
+			if (band_fd != -1 && lseek(band_fd, start, SEEK_SET) == -1)
+				return done;
+			ssize_t err = func(band_fd, buf, segment);
+			if (err > 0)
+				done += err;
+			if (err < segment)
+				break;
+			
+			b += segment;
+			offset += segment;
+			length -= segment;
+			++band;
+		}
+		return done;
+	}
+	
+	// Open band index 'band', return false on error
+	bool open_band(loff_t band) {
+		if (band_cur == band)
+			return true;
+		
+		char path[PATH_MAX + 1];
+		if (snprintf(path, PATH_MAX, "%s/%lx", band_dir,
+				(unsigned long)band) >= PATH_MAX) {
+			return false;
+		}
+		
+		int oflags = read_only ? O_RDONLY : (O_RDWR | O_CREAT);
+		band_fd = open(path, oflags, 0644);
+		if (band_fd == -1) {
+			if (read_only) {
+				band_cur == -1;
+				return true;
+			} else {
+				return false;
+			}
+		}
+		
+		band_cur = band;
+		return true;
+	}
+};
+
+disk_generic *disk_sparsebundle_factory(const char *path, bool read_only) {
+	if (strstr(path, ".sparsebundle") == NULL)
+		return NULL; // FIXME: real test
+	
+	// FIXME: actually read these
+	loff_t band_size = 1048576;
+	loff_t total_size = 53687091200;
+	
+	// FIXME: check for double-mount, writable
+	int token = 0;
+	read_only = false;
+	
+	char buf[PATH_MAX + 1];
+	if (snprintf(buf, PATH_MAX, "%s/%s", path, "bands") >= PATH_MAX)
+		return NULL;
+	char *bands = strdup(buf);
+	
+	return new disk_sparsebundle(bands, token, read_only, band_size,
+		total_size);
+}

BasiliskII/src/Unix/disk_unix.h

@@ -0,0 +1,40 @@
+/*
+ *  disk_unix.h - Generic disk interface
+ *
+ *  Basilisk II (C) Dave Vasilevsky
+ *
+ *  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
+ */
+
+#ifndef DISK_UNIX_H
+#define DISK_UNIX_H
+
+#include "sysdeps.h"
+
+struct disk_generic {
+	disk_generic() { }
+	virtual ~disk_generic() { };
+	
+	virtual bool is_read_only() = 0;
+	virtual size_t read(void *buf, loff_t offset, size_t length) = 0;
+	virtual size_t write(void *buf, loff_t offset, size_t length) = 0;
+	virtual loff_t size() = 0;
+};
+
+typedef disk_generic *(disk_factory)(const char *path, bool read_only);
+
+extern disk_factory disk_sparsebundle_factory;
+
+#endif

BasiliskII/src/Unix/sys_unix.cpp

@@ -56,6 +56,7 @@
 #include "prefs.h"
 #include "user_strings.h"
 #include "sys.h"
+#include "disk_unix.h"
 
 #if defined(BINCUE)
 #include "bincue_unix.h"
@@ -83,6 +84,7 @@ struct mac_file_handle {
 	loff_t file_size;	// Size of file data (only valid if is_file is true)
 
 	bool is_media_present;		// Flag: media is inserted and available
+	disk_generic *generic_disk;
 
 #if defined(__linux__)
 	int cdrom_cap;		// CD-ROM capability flags (only valid if is_cdrom is true)
@@ -525,6 +527,7 @@ static mac_file_handle *open_filehandle(const char *name)
 		memset(fh, 0, sizeof(mac_file_handle));
 		fh->name = strdup(name);
 		fh->fd = -1;
+		fh->generic_disk = NULL;
 #if defined __MACOSX__
 		fh->ioctl_fd = -1;
 		fh->ioctl_name = NULL;
@@ -615,6 +618,18 @@ void *Sys_open(const char *name, bool read_only)
 		return fh;
 	}
 #endif
+	
+	// FIXME
+	disk_generic *generic = disk_sparsebundle_factory(name, read_only);
+	if (generic) {
+		mac_file_handle *fh = open_filehandle(name);
+		fh->generic_disk = generic;
+		fh->file_size = generic->size();
+		fh->read_only = generic->is_read_only();
+		fh->is_media_present = true;
+		sys_add_mac_file_handle(fh);
+		return fh;
+	}
 
 	int open_flags = (read_only ? O_RDONLY : O_RDWR);
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__MACOSX__)
@@ -727,6 +742,8 @@ void Sys_close(void *arg)
 	if (fh->is_bincue)
 		close_bincue(fh->bincue_fd);
 #endif
+	if (fh->generic_disk)
+		delete fh->generic_disk;
 
 	if (fh->is_cdrom)
 		cdrom_close(fh);
@@ -759,6 +776,9 @@ size_t Sys_read(void *arg, void *buffer, loff_t offset, size_t length)
 		return vhd_unix_read(fh->vhd_fd, buffer, offset, length);
 #endif
 
+	if (fh->generic_disk)
+		return fh->generic_disk->read(buffer, offset, length);
+	
 	// Seek to position
 	if (lseek(fh->fd, offset + fh->start_byte, SEEK_SET) < 0)
 		return 0;
@@ -784,6 +804,9 @@ size_t Sys_write(void *arg, void *buffer, loff_t offset, size_t length)
 		return vhd_unix_write(fh->vhd_fd, buffer, offset, length);
 #endif
 
+	if (fh->generic_disk)
+		return fh->generic_disk->write(buffer, offset, length);
+
 	// Seek to position
 	if (lseek(fh->fd, offset + fh->start_byte, SEEK_SET) < 0)
 		return 0;
@@ -813,6 +836,9 @@ loff_t SysGetFileSize(void *arg)
 		return fh->file_size;
 #endif
 
+	if (fh->generic_disk)
+		return fh->file_size;
+
 	if (fh->is_file)
 		return fh->file_size;
 	else {
@@ -950,6 +976,9 @@ bool SysIsFixedDisk(void *arg)
 	if (fh->is_vhd)
 		return true;
 #endif
+	
+	if (fh->generic_disk)
+		return true;
 
 	if (fh->is_file)
 		return true;
@@ -975,6 +1004,9 @@ bool SysIsDiskInserted(void *arg)
 		return true;
 #endif
 
+	if (fh->generic_disk)
+		return true;
+	
 	if (fh->is_file) {
 		return true;
 

SheepShaver/src/Unix/Makefile.in

@@ -59,7 +59,7 @@ SRCS = ../main.cpp main_unix.cpp ../prefs.cpp ../prefs_items.cpp prefs_unix.cpp
     ../macos_util.cpp ../timer.cpp timer_unix.cpp ../xpram.cpp xpram_unix.cpp \
     ../adb.cpp ../sony.cpp ../disk.cpp ../cdrom.cpp ../scsi.cpp \
     ../gfxaccel.cpp ../video.cpp video_blit.cpp ../audio.cpp ../ether.cpp ../thunks.cpp \
-    ../serial.cpp ../extfs.cpp \
+    ../serial.cpp ../extfs.cpp disk_sparsebundle.cpp \
     about_window_unix.cpp ../user_strings.cpp user_strings_unix.cpp \
     vm_alloc.cpp sigsegv.cpp rpc_unix.cpp \
     sshpty.c strlcpy.c $(SYSSRCS) $(CPUSRCS) $(MONSRCS) $(SLIRP_SRCS)