171 lines
4.2 KiB
C++
171 lines
4.2 KiB
C++
/*
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* macos_util.cpp - MacOS definitions/utility functions
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*
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* Basilisk II (C) 1997-2008 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sysdeps.h"
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#include "cpu_emulation.h"
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#include "adb.h"
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#include "main.h"
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#include "sony.h"
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#include "disk.h"
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#include "cdrom.h"
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#include "macos_util.h"
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#include "prefs.h"
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#include <algorithm>
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#define DEBUG 0
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#include "debug.h"
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/*
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* Enqueue QElem to list
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*/
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void EnqueueMac(uint32 elem, uint32 list)
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{
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WriteMacInt32(elem + qLink, 0);
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if (!ReadMacInt32(list + qTail)) {
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WriteMacInt32(list + qHead, elem);
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WriteMacInt32(list + qTail, elem);
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} else {
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WriteMacInt32(ReadMacInt32(list + qTail) + qLink, elem);
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WriteMacInt32(list + qTail, elem);
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}
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}
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/*
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* Find first free drive number, starting at num
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*/
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static bool is_drive_number_free(int num)
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{
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uint32 e = ReadMacInt32(0x308 + qHead);
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while (e) {
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uint32 d = e - dsQLink;
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if ((int)ReadMacInt16(d + dsQDrive) == num)
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return false;
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e = ReadMacInt32(e + qLink);
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}
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return true;
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}
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int FindFreeDriveNumber(int num)
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{
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while (!is_drive_number_free(num))
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num++;
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return num;
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}
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/*
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* Mount volume with given file handle (call this function when you are unable to
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* do automatic media change detection and the user has to press a special key
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* or something to mount a volume; this function will check if there's really a
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* volume in the drive with SysIsDiskInserted(); volumes which are present on startup
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* are automatically mounted)
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*/
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void MountVolume(void *fh)
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{
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SonyMountVolume(fh) || DiskMountVolume(fh) || CDROMMountVolume(fh);
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}
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/*
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* Calculate disk image file layout given file size and first 256 data bytes
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*/
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void FileDiskLayout(loff_t size, uint8 *data, loff_t &start_byte, loff_t &real_size)
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{
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if (size == 419284 || size == 838484) {
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// 400K/800K DiskCopy image, 84 byte header
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start_byte = 84;
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real_size = (size - 84) & ~0x1ff;
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} else {
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// 0..511 byte header
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start_byte = size & 0x1ff;
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real_size = size - start_byte;
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}
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}
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uint32 DebugUtil(uint32 Selector)
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{
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switch (Selector) {
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case duDebuggerGetMax:
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return 3;
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case duDebuggerEnter:
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return 0;
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case duDebuggerExit:
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return 0;
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case duDebuggerPoll:
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ADBInterrupt();
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return 0;
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default:
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return (uint32) paramErr;
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}
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}
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/*
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* Convert time_t value to MacOS time (seconds since 1.1.1904)
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*/
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uint32 TimeToMacTime(time_t t)
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{
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// This code is taken from glibc 2.2
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// Convert to number of seconds elapsed since 1-Jan-1904
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#ifdef WIN32
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if (t == -1) {
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// failsafe as this will segfault
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return 0;
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}
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#endif
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struct tm *local = localtime(&t);
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const int TM_EPOCH_YEAR = 1900;
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const int MAC_EPOCH_YEAR = 1904;
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// Clip year and day offsets to prevent dates earlier than 1-Jan-1904
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local->tm_year = std::max(MAC_EPOCH_YEAR - TM_EPOCH_YEAR, local->tm_year + PrefsFindInt32("yearofs"));
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int a4 = ((local->tm_year + TM_EPOCH_YEAR) >> 2) - !(local->tm_year & 3);
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int b4 = (MAC_EPOCH_YEAR >> 2) - !(MAC_EPOCH_YEAR & 3);
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int a100 = a4 / 25 - (a4 % 25 < 0);
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int b100 = b4 / 25 - (b4 % 25 < 0);
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int a400 = a100 >> 2;
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int b400 = b100 >> 2;
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int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
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uint32 days = local->tm_yday + 365 * (local->tm_year - 4) + intervening_leap_days;
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int32 dayofs = -PrefsFindInt32("dayofs");
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if(dayofs > 0 && dayofs > days)
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dayofs = days;
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return local->tm_sec + 60 * (local->tm_min + 60 * (local->tm_hour + 24 * (days - dayofs)));
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}
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/*
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* Convert MacOS time to time_t (seconds since 1.1.1970)
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*/
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time_t MacTimeToTime(uint32 t)
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{
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// simply subtract number of seconds between 1.1.1904 and 1.1.1970
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return t - 2082826800;
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}
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