BasiliskII/src/macos_util.cpp

/*
 *  macos_util.cpp - MacOS definitions/utility functions
 *
 *  Basilisk II (C) 1997-2001 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 "sysdeps.h"
#include "cpu_emulation.h"
#include "adb.h"
#include "main.h"
#include "sony.h"
#include "disk.h"
#include "cdrom.h"
#include "macos_util.h"

#define DEBUG 0
#include "debug.h"


/*
 *  Enqueue QElem to list
 */

void EnqueueMac(uint32 elem, uint32 list)
{
        WriteMacInt32(elem + qLink, 0);
        if (!ReadMacInt32(list + qTail)) {
                WriteMacInt32(list + qHead, elem);
                WriteMacInt32(list + qTail, elem);
        } else {
                WriteMacInt32(ReadMacInt32(list + qTail) + qLink, elem);
                WriteMacInt32(list + qTail, elem);
        }
}


/*
 *  Find first free drive number, starting at num
 */

static bool is_drive_number_free(int num)
{
        uint32 e = ReadMacInt32(0x308 + qHead);
        while (e) {
                uint32 d = e - dsQLink;
                if ((int)ReadMacInt16(d + dsQDrive) == num)
                        return false;
                e = ReadMacInt32(e + qLink);
        }
        return true;
}

int FindFreeDriveNumber(int num)
{
        while (!is_drive_number_free(num))
                num++;
        return num;
}


/*
 *  Mount volume with given file handle (call this function when you are unable to
 *  do automatic media change detection and the user has to press a special key
 *  or something to mount a volume; this function will check if there's really a
 *  volume in the drive with SysIsDiskInserted(); volumes which are present on startup
 *  are automatically mounted)
 */

void MountVolume(void *fh)
{
        SonyMountVolume(fh) || DiskMountVolume(fh) || CDROMMountVolume(fh);
}


/*
 *  Calculate disk image file layout given file size and first 256 data bytes
 */

void FileDiskLayout(loff_t size, uint8 *data, loff_t &start_byte, loff_t &real_size)
{
        if (size == 419284 || size == 838484) {
                // 400K/800K DiskCopy image, 84 byte header
                start_byte = 84;
                real_size = (size - 84) & ~0x1ff;
        } else {
                // 0..511 byte header
                start_byte = size & 0x1ff;
                real_size = size - start_byte;
        }
}


uint32 DebugUtil(uint32 Selector)
{
        switch (Selector) {
                case duDebuggerGetMax:
                        return 3;
                case duDebuggerEnter:
                        return 0;
                case duDebuggerExit:
                        return 0;
                case duDebuggerPoll:
                        ADBInterrupt();
                        return 0;
                default:
                        return (uint32) paramErr;
        }
}


/*
 *  Convert time_t value to MacOS time (seconds since 1.1.1904)
 */

uint32 TimeToMacTime(time_t t)
{
        // This code is taken from glibc 2.2

        // Convert to number of seconds elapsed since 1-Jan-1904
        struct tm *local = localtime(&t);
        const int TM_EPOCH_YEAR = 1900;
        const int MAC_EPOCH_YEAR = 1904;
        int a4 = ((local->tm_year + TM_EPOCH_YEAR) >> 2) - !(local->tm_year & 3);
        int b4 = (MAC_EPOCH_YEAR >> 2) - !(MAC_EPOCH_YEAR & 3);
        int a100 = a4 / 25 - (a4 % 25 < 0);
        int b100 = b4 / 25 - (b4 % 25 < 0);
        int a400 = a100 >> 2;
        int b400 = b100 >> 2;
        int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
        uint32 days = local->tm_yday + 365 * (local->tm_year - 4) + intervening_leap_days;
        return local->tm_sec + 60 * (local->tm_min + 60 * (local->tm_hour + 24 * days));
}
Revision:	1.8
Committed:	2001-07-06T17:36:06Z (23 years, 4 months ago) by cebix
Branch:	MAIN
Changes since 1.7:	+36 -14 lines
Log Message:	replaced TIME_OFFSET constant by portable TimeToMacTime() function
#	User	Rev	Content
1	cebix	1.1	/*
2			* macos_util.cpp - MacOS definitions/utility functions
3			*
4	cebix	1.7	* Basilisk II (C) 1997-2001 Christian Bauer
5	cebix	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include "sysdeps.h"
22			#include "cpu_emulation.h"
23	jlachmann	1.6	#include "adb.h"
24	cebix	1.1	#include "main.h"
25			#include "sony.h"
26			#include "disk.h"
27			#include "cdrom.h"
28			#include "macos_util.h"
29
30			#define DEBUG 0
31			#include "debug.h"
32
33
34			/*
35			* Enqueue QElem to list
36			*/
37
38	cebix	1.3	void EnqueueMac(uint32 elem, uint32 list)
39	cebix	1.1	{
40			WriteMacInt32(elem + qLink, 0);
41			if (!ReadMacInt32(list + qTail)) {
42			WriteMacInt32(list + qHead, elem);
43			WriteMacInt32(list + qTail, elem);
44			} else {
45			WriteMacInt32(ReadMacInt32(list + qTail) + qLink, elem);
46			WriteMacInt32(list + qTail, elem);
47			}
48			}
49
50
51			/*
52			* Find first free drive number, starting at num
53			*/
54
55			static bool is_drive_number_free(int num)
56			{
57			uint32 e = ReadMacInt32(0x308 + qHead);
58			while (e) {
59			uint32 d = e - dsQLink;
60	cebix	1.2	if ((int)ReadMacInt16(d + dsQDrive) == num)
61	cebix	1.1	return false;
62			e = ReadMacInt32(e + qLink);
63			}
64			return true;
65			}
66
67			int FindFreeDriveNumber(int num)
68			{
69			while (!is_drive_number_free(num))
70			num++;
71			return num;
72			}
73
74
75			/*
76			* Mount volume with given file handle (call this function when you are unable to
77			* do automatic media change detection and the user has to press a special key
78			* or something to mount a volume; this function will check if there's really a
79			* volume in the drive with SysIsDiskInserted(); volumes which are present on startup
80			* are automatically mounted)
81			*/
82
83			void MountVolume(void *fh)
84			{
85			SonyMountVolume(fh) \|\| DiskMountVolume(fh) \|\| CDROMMountVolume(fh);
86			}
87
88
89			/*
90			* Calculate disk image file layout given file size and first 256 data bytes
91			*/
92
93			void FileDiskLayout(loff_t size, uint8 *data, loff_t &start_byte, loff_t &real_size)
94			{
95			if (size == 419284 \|\| size == 838484) {
96			// 400K/800K DiskCopy image, 84 byte header
97			start_byte = 84;
98			real_size = (size - 84) & ~0x1ff;
99			} else {
100			// 0..511 byte header
101			start_byte = size & 0x1ff;
102			real_size = size - start_byte;
103			}
104			}
105	jlachmann	1.6
106
107			uint32 DebugUtil(uint32 Selector)
108			{
109	cebix	1.8	switch (Selector) {
110			case duDebuggerGetMax:
111			return 3;
112			case duDebuggerEnter:
113			return 0;
114			case duDebuggerExit:
115			return 0;
116			case duDebuggerPoll:
117			ADBInterrupt();
118			return 0;
119			default:
120			return (uint32) paramErr;
121			}
122	jlachmann	1.6	}
123
124	cebix	1.8
125			/*
126			* Convert time_t value to MacOS time (seconds since 1.1.1904)
127			*/
128
129			uint32 TimeToMacTime(time_t t)
130			{
131			// This code is taken from glibc 2.2
132
133			// Convert to number of seconds elapsed since 1-Jan-1904
134			struct tm *local = localtime(&t);
135			const int TM_EPOCH_YEAR = 1900;
136			const int MAC_EPOCH_YEAR = 1904;
137			int a4 = ((local->tm_year + TM_EPOCH_YEAR) >> 2) - !(local->tm_year & 3);
138			int b4 = (MAC_EPOCH_YEAR >> 2) - !(MAC_EPOCH_YEAR & 3);
139			int a100 = a4 / 25 - (a4 % 25 < 0);
140			int b100 = b4 / 25 - (b4 % 25 < 0);
141			int a400 = a100 >> 2;
142			int b400 = b100 >> 2;
143			int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
144			uint32 days = local->tm_yday + 365 * (local->tm_year - 4) + intervening_leap_days;
145			return local->tm_sec + 60 * (local->tm_min + 60 * (local->tm_hour + 24 * days));
146			}