BasiliskII/src/macos_util.cpp

/*
 *  macos_util.cpp - MacOS definitions/utility functions
 *
 *  Basilisk II (C) 1997-2002 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:	1.9
Committed:	2002-01-15T14:58:32Z (22 years, 10 months ago) by cebix
Branch:	MAIN
CVS Tags:	nigel-build-12, nigel-build-13, snapshot-15012002
Changes since 1.8:	+1 -1 lines
Log Message:	- documentation updates - 2001 -> 2002 - version 0.9 -> 1.0
#	Content
1	/*
2	* macos_util.cpp - MacOS definitions/utility functions
3	*
4	* Basilisk II (C) 1997-2002 Christian Bauer
5	*
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	#include "adb.h"
24	#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	void EnqueueMac(uint32 elem, uint32 list)
39	{
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	if ((int)ReadMacInt16(d + dsQDrive) == num)
61	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
106
107	uint32 DebugUtil(uint32 Selector)
108	{
109	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	}
123
124
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	}