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sdl_loadsave.c
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/* sz81 Copyright (C) 2007-2011 Thunor <[email protected]>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Includes */
#include "sdl_engine.h"
#include "common.h"
#include "loadp.h"
/* Error macros */
#define ERROR_D() mem[16384] = 12;
#define ERROR_INV1() mem[16384] = 128;
#define ERROR_INV2() mem[16384] = 129;
#define ERROR_INV3() mem[16384] = 130;
/* Function prototypes */
char *strtoupper(char *original);
bool parseNumber(const char* input,
unsigned int min,
unsigned int max,
char term,
unsigned int* out);
char *strzx81_to_ascii(int memaddr);
char *strzx80_to_ascii(int memaddr);
void fwrite_unsigned_short_little_endian(unsigned short *source, FILE *fp);
void fwrite_int_little_endian(int *source, FILE *fp);
void fwrite_unsigned_long_little_endian(unsigned long *source, FILE *fp);
void fread_unsigned_short_little_endian(unsigned short *target, FILE *fp);
void fread_int_little_endian(int *target, FILE *fp);
void fread_unsigned_long_little_endian(unsigned long *target, FILE *fp);
#ifdef PLATFORM_RISCOS
extern char riscos_prog_dir[];
#endif
/***************************************************************************
* Load File Dialog Directory List Populate *
***************************************************************************/
/* This is called from multiple places.
*
* On entry: int refresh = TRUE if this is just a directory refresh
* else FALSE */
void load_file_dialog_dirlist_populate(int refresh) {
int filetypes;
if (*sdl_emulator.model == MODEL_ZX80) {
filetypes = DIRLIST_FILETYPE_ZX80;
} else {
filetypes = DIRLIST_FILETYPE_ZX81;
}
/* Repopulate the load file dialog's directory list */
dirlist_populate(load_file_dialog.dir,
&load_file_dialog.dirlist, &load_file_dialog.dirlist_sizeof,
&load_file_dialog.dirlist_count, filetypes);
/* If this is just a refresh then don't reset these */
if (!refresh) {
load_file_dialog.dirlist_top = 0;
load_file_dialog.dirlist_selected = 0;
}
}
/***************************************************************************
* Save State Dialog Slots Populate *
***************************************************************************/
/* This function will open the currently loaded program's save state folder
* and create it if it's not found to exist. It will then scan it looking
* for savsta1.ss{o|p} to savsta9.ss{o|p} */
int save_state_dialog_slots_populate(void) {
struct dirent *direntry;
char foldername[256];
char parentname[256];
int retval = FALSE;
int count, index;
DIR *dirstream;
/* Wipe the slots ready for fresh data */
for (count = 0; count < 9; count++)
save_state_dialog.slots[count] = 0;
/* Build a path to the currently loaded program's save state folder */
#if defined(PLATFORM_GP2X) || defined(__amigaos4__) || defined(_WIN32)
strcpy(foldername, LOCAL_DATA_DIR);
#elif defined(PLATFORM_RISCOS)
strcpy(foldername, riscos_prog_dir);
strcatdelimiter(foldername);
strcat(foldername, LOCAL_DATA_DIR);
#else
strcpy(foldername, getenv ("HOME"));
strcatdelimiter(foldername);
strcat(foldername, LOCAL_DATA_DIR);
#endif
strcatdelimiter(foldername);
strcat(foldername, LOCAL_SAVSTA_DIR);
strcatdelimiter(foldername);
/* Here I'm going to create a single letter parent directory which
* is the first letter of the program name. Due to some nonsense
* experienced with my GP2X FAT32 Sandisk SD card creating m instead
* of M, showing m in termula2x but M plugged into my card reader on
* my Linux desktop computer I'm going to force the parent to lower-
* case so that MazezaM.p will save as local/m/MazezaM.p and fingers-
* crossed it'll universally work */
foldername[index = strlen(foldername)] =
tolower(file_dialog_basename(load_file_dialog.loaded)[0]);
foldername[++index] = 0;
strcpy(parentname, foldername);
/* parentname will now be something like local/m and
* foldername will now be something like local/m/MazezaM.p */
strcatdelimiter(foldername);
strcat(foldername, file_dialog_basename(load_file_dialog.loaded));
/* Firstly attempt to open the folder */
if ((dirstream = opendir(foldername)) == NULL) {
/* The path doesn't yet exist so attempt to create everything
* from parentname and onwards */
mkdir(parentname, 0755);
mkdir(foldername, 0755);
/* Attempt to open the newly created folder */
dirstream = opendir(foldername);
}
if (dirstream != NULL) {
while ((direntry = readdir(dirstream))) {
if (strlen(direntry->d_name) >= 5 &&
direntry->d_name[strlen(direntry->d_name) - 5] >= '1' &&
direntry->d_name[strlen(direntry->d_name) - 5] <= '9' &&
((*sdl_emulator.model == MODEL_ZX80 &&
sdl_filetype_casecmp(direntry->d_name, ".sso") == 0) ||
(((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K)) &&
sdl_filetype_casecmp(direntry->d_name, ".ssp") == 0))) {
save_state_dialog.slots[direntry->d_name
[strlen(direntry->d_name) - 5] - '1'] = TRUE;
}
}
closedir(dirstream);
} else {
retval = TRUE;
fprintf(stderr, "%s: Cannot read from directory %s\n", __func__,
foldername);
}
return retval;
}
/***************************************************************************
* Save File *
***************************************************************************/
/* This function replaces z81's save_p.
*
* On entry: if method = SAVE_FILE_METHOD_NAMEDSAVE then parameter holds
* the contents of the hl register pair which points to the
* area in the ZX81's memory that contains the program name.
* if method = SAVE_FILE_METHOD_STATESAVE then parameter holds
* the slot number 0 to 8.
* for all other methods parameter is ignored.
* On exit: returns TRUE on error, REPEAT if prepared for ROM save
* else FALSE */
int sdl_save_file(int parameter, int method) {
char fullpath[256]={0}, filename[256];
struct Notification notification;
int retval = FALSE;
int index;
FILE *fp;
int idxend, vars;
char *extend = 0;
char *comma = 0;
int start = 0;
int length = 0;
bool found = false;
bool zx80_4k = false;
bool repeat = false;
if ((method == SAVE_FILE_METHOD_NAMEDSAVE) ||
(method == SAVE_FILE_METHOD_UNNAMEDSAVE)) {
if (method == SAVE_FILE_METHOD_NAMEDSAVE) {
/* Build a path from the last entered directory */
strcpy(fullpath, load_file_dialog.dir);
/* Add a directory delimiter if required */
strcatdelimiter(fullpath);
strcpy(filename, strzx81_to_ascii(parameter));
}
else if (method == SAVE_FILE_METHOD_UNNAMEDSAVE) {
zx80_4k = true;
/* Build a path from the last entered directory */
strcpy(fullpath, load_file_dialog.dir);
/* Add a directory delimiter if required */
strcatdelimiter(fullpath);
/* At the moment I'm not looking to develop a Save As dialog
* just for ZX80 files, but I'm happy to implement some other
* methods to name the files:
* 1. Date and time stamped files e.g. zx80-20110115-234836.o
* (the GP2X won't support this but everything else is OK)
* 2. Incremented filenames e.g. zx80-0001.o, zx80-0002.o etc.
* 3. Filenames embedded within a xxxx REM SAVE "progname"
* (works on any platform and is actually quit cool :) ) */
index = 0x4028; /* Start of user program area */
vars = mem[0x4009] << 8 | mem[0x4008]; /* VARS */
while (index < vars) {
if (mem[index] == 0xfe && mem[index + 1] == 0xea &&
mem[index + 2] == 0x01) { /* REM SAVE " */
idxend = index = index + 3; /* Position on first char */
while (mem[idxend] != 0x01 && mem[idxend] < 0x80 &&
mem[idxend] != 0x76 && idxend < vars) idxend++;
if (index < idxend) {
mem[--idxend] |= 0x80; /* +80h marks last char */
strcpy(filename, strzx80_to_ascii(index));
mem[idxend] &= ~0x80; /* Remove +80h */
index = vars; /* Exit loop */
}
}
index++;
}
if (index == vars) {
/* Create a unique filename using the date and time Redundant
rightnow = time(NULL);
timestruct = localtime(&rightnow);
strftime(filename, sizeof(filename), "zx80-%Y%m%d-%H%M%S.o", timestruct);*/
/* Create a unique filename using the next highest number
* (it'll return 0 if the directory couldn't be opened or 1 as
* the base number when no files exist that match the pattern) */
index = get_filename_next_highest(fullpath, "zx80prog%4d");
sprintf(filename, "zx80prog%04i.o", index);
}
}
// find last ;
extend = strrchr(filename, ';');
if (extend) {
// verify , after last ;
++extend;
comma = strrchr(extend, ',');
if (comma) {
found = true; // Have found ; and ,
++comma;
if (!parseNumber(extend, 0, 0xffff, ',', (unsigned int*)&start)) {
fprintf(stderr, "Illegal start address, generating error 1\n");
ERROR_INV1();
retval = TRUE;
} else if (!parseNumber(comma, 1, 0x10000, 0, (unsigned int*)&length)) {
fprintf(stderr, "Illegal length, generating error 2\n");
ERROR_INV2();
retval = TRUE;
} else if (start + length > 0x10000) {
// Check that the end address is within 64kB
fprintf(stderr, "Start %i + length %i too large, generating error 3\n", start, length);
ERROR_INV3();
retval = TRUE;
}
}
}
if (!retval) {
if (!found) {
/* Add a file extension if one hasn't already been affixed and it is not a memory save*/
if (zx80_4k) {
/* Add a file extension if one hasn't already been affixed */
if (sdl_filetype_casecmp(filename, ".o") != 0 &&
sdl_filetype_casecmp(filename, ".80") != 0)
strcat(filename, ".o");
}
else {
if (sdl_filetype_casecmp(filename, ".p") != 0 &&
sdl_filetype_casecmp(filename, ".81") != 0)
strcat(filename, ".p");
}
}
else {
--extend;
*extend = 0;
}
/* Add program name */
strcat(fullpath, filename);
}
} else if (method == SAVE_FILE_METHOD_STATESAVE) {
/* Build a path to the currently loaded program's save state folder */
#if defined(PLATFORM_GP2X) || defined(__amigaos4__) || defined(_WIN32)
strcpy(fullpath, LOCAL_DATA_DIR);
#elif defined(PLATFORM_RISCOS)
strcpy(fullpath, riscos_prog_dir);
strcatdelimiter(fullpath);
strcat(fullpath, LOCAL_DATA_DIR);
#else
strcpy(fullpath, getenv ("HOME"));
strcatdelimiter(fullpath);
strcat(fullpath, LOCAL_DATA_DIR);
#endif
strcatdelimiter(fullpath);
strcat(fullpath, LOCAL_SAVSTA_DIR);
strcatdelimiter(fullpath);
fullpath[index = strlen(fullpath)] =
tolower(file_dialog_basename(load_file_dialog.loaded)[0]);
fullpath[++index] = 0;
strcatdelimiter(fullpath);
strcat(fullpath, file_dialog_basename(load_file_dialog.loaded));
strcatdelimiter(fullpath);
/* Form an appropriate filename */
if (*sdl_emulator.model == MODEL_ZX80) {
sprintf(filename, "savsta%i.sso", parameter + 1);
} else if ((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K)) {
sprintf(filename, "savsta%i.ssp", parameter + 1);
}
/* Append filename to fullpath */
strcat(fullpath, filename);
}
/* Attempt to open the file */
if ((!retval) &&
((fp = fopen(fullpath, "wb")) != NULL)) {
if (method == SAVE_FILE_METHOD_STATESAVE) {
/* Printer variables are reinitialised when a new file
* is opened on output so saving them is futile.
* Saving keyports and sound variables is unneccessary.
* signal_int_flag is being updated by the SDL timer
* likely in another thread so no point in saving that.
* refresh_screen I'm forcing to 1 anyway.
*
* To make these files platform independent I'm saving
* and restoring everything by the byte in little-endian
* format. These are the integer sizes on my development
* computer (GNU/Linux 32bit):
*
* sizeof(long) = 4 bytes
* sizeof(int) = 4 bytes
* sizeof(short) = 2 bytes
* sizeof(char) = 1 byte */
/* The entire contents of memory */
fwrite(mem, 1, 64 * 1024, fp); /* unsigned char */
fwrite_int_little_endian(&sdl_emulator.ramsize, fp);
/* Variables from z80.h */
fwrite_unsigned_long_little_endian(&frames, fp);
fwrite_int_little_endian(&framewait, fp);
fwrite_int_little_endian(&vsx, fp);
fwrite_int_little_endian(&vsy, fp);
fwrite_int_little_endian(&RasterX, fp);
fwrite_int_little_endian(&RasterY, fp);
fwrite_int_little_endian(&S_RasterX, fp);
fwrite_int_little_endian(&S_RasterY, fp);
fwrite_int_little_endian(&nmi_pending, fp);
fwrite_int_little_endian(&hsync_pending, fp);
fwrite_int_little_endian(&NMI_generator, fp);
fwrite_int_little_endian(&VSYNC_state, fp);
fwrite_int_little_endian(&HSYNC_state, fp);
fwrite_int_little_endian(&SYNC_signal, fp);
fwrite_int_little_endian(&psync, fp);
fwrite_int_little_endian(&sync_len, fp);
fwrite_int_little_endian(&rowcounter, fp);
fwrite_int_little_endian(&hsync_counter, fp);
fwrite_int_little_endian(&VSYNC_TOLERANCEMIN, fp);
fwrite_int_little_endian(&VSYNC_TOLERANCEMAX, fp);
fwrite_int_little_endian(&FRAME_SCAN, fp);
fwrite(&rowcounter_hold, 1, 1, fp);
fwrite(&running_rom, 1, 1, fp);
fwrite(&frameNotSync, 1, 1, fp);
/* Z80 Registers */
fwrite(&a, 1, 1, fp); /* unsigned char */
fwrite(&f, 1, 1, fp);
fwrite(&b, 1, 1, fp);
fwrite(&c, 1, 1, fp);
fwrite(&d, 1, 1, fp);
fwrite(&e, 1, 1, fp);
fwrite(&h, 1, 1, fp);
fwrite(&l, 1, 1, fp);
fwrite(&r, 1, 1, fp);
fwrite(&a1, 1, 1, fp);
fwrite(&f1, 1, 1, fp);
fwrite(&b1, 1, 1, fp);
fwrite(&c1, 1, 1, fp);
fwrite(&d1, 1, 1, fp);
fwrite(&e1, 1, 1, fp);
fwrite(&h1, 1, 1, fp);
fwrite(&l1, 1, 1, fp);
fwrite(&i, 1, 1, fp);
fwrite(&iff1, 1, 1, fp);
fwrite(&iff2, 1, 1, fp);
fwrite(&im, 1, 1, fp);
fwrite_unsigned_short_little_endian(&pc, fp);
fwrite_unsigned_short_little_endian(&ix, fp);
fwrite_unsigned_short_little_endian(&iy, fp);
fwrite_unsigned_short_little_endian(&sp, fp);
fwrite_unsigned_short_little_endian(&m1cycles, fp);
fwrite(&radjust, 1, 1, fp); /* unsigned char */
fwrite(&ixoriy, 1, 1, fp); /* unsigned char */
fwrite(&new_ixoriy, 1, 1, fp);
fwrite(&intsample, 1, 1, fp);
fwrite(&op, 1, 1, fp);
fwrite_int_little_endian(&scanlineCounter, fp);
fwrite_int_little_endian(&videoFlipFlop1Q, fp);
fwrite_int_little_endian(&videoFlipFlop2Q, fp);
fwrite_int_little_endian(&videoFlipFlop3Q, fp);
fwrite_int_little_endian(&videoFlipFlop3Clear, fp);
fwrite_int_little_endian(&prevVideoFlipFlop3Q, fp);
fwrite_int_little_endian(&lineClockCarryCounter, fp);
fwrite_int_little_endian(&scanline_len, fp);
fwrite_int_little_endian(&sync_type, fp);
fwrite_int_little_endian(&nosync_lines, fp);
/* Variables from common.h */
fwrite_unsigned_long_little_endian(&tstates, fp);
fwrite(&UDGEnabled, 1, 1, fp);
fwrite_int_little_endian(&sound, fp);
fwrite_int_little_endian(&sound_vsync, fp);
fwrite_int_little_endian(&sound_ay, fp);
fwrite_int_little_endian(&sound_ay_type, fp);
fwrite_int_little_endian(&interrupted, fp);
fwrite_int_little_endian(&zx80, fp);
fwrite_int_little_endian(&chromamode, fp);
fwrite(&bordercolour, 1, 1, fp);
fwrite(&bordercolournew, 1, 1, fp);
fwrite(&fullcolour, 1, 1, fp);
fwrite(&chroma_set, 1, 1, fp);
} else {
if (found) {
fwrite(mem + start, 1, length, fp);
}
else
{
/* Write up to and including E_LINE */
if (*sdl_emulator.model == MODEL_ZX80) {
fwrite(mem + 0x4000, 1, (mem[0x400b] << 8 | mem[0x400a]) - 0x4000, fp);
} else if ((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K)) {
fwrite(mem + 0x4009, 1, (mem[0x4015] << 8 | mem[0x4014]) - 0x4009, fp);
}
/* Copy fullpath across to the load file dialog as
* then we have a record of what was last saved */
strcpy(load_file_dialog.loaded, fullpath);
if (rom_patches.save.use_rom)
{
repeat = true;
}
}
}
/* Close the file now as we've finished with it */
fclose(fp);
} else {
retval = TRUE;
}
if (retval)
{
/* Warn the user via the GUI that the save failed */
if (method == SAVE_FILE_METHOD_STATESAVE) {
strcpy(notification.title, "Save State");
} else {
strcpy(notification.title, "Save");
}
strcpy(notification.text, "Failed");
notification.timeout = NOTIFICATION_TIMEOUT_1250;
notification_show(NOTIFICATION_SHOW, ¬ification);
}
else {
if (method != SAVE_FILE_METHOD_STATESAVE) {
/* Refresh the load file dialog's directory list */
load_file_dialog_dirlist_populate(TRUE);
}
}
return repeat ? REPEAT : retval;
}
/***************************************************************************
* Load File *
***************************************************************************/
/* This function replaces z81's load_p.
*
* On entry: if method = LOAD_FILE_METHOD_NAMEDLOAD then parameter holds
* the contents of the hl register pair which points to the
* area in the ZX81's memory that contains the program name.
* if method = LOAD_FILE_METHOD_STATELOAD then parameter holds
* the slot number 0 to 8.
* for all other methods parameter is ignored.
* On exit: returns TRUE on error, REPEAT if prepared for ROM load
* else FALSE */
int sdl_load_file(int parameter, int method) {
char fullpath[256] = {0}, filename[256];
struct Notification notification;
int retval = FALSE;
int count, index;
int ramsize;
FILE *fp;
char *extend = 0;
int start = -1;
bool repeat = false;
/* If requested, read and set the preset method instead */
if (method == LOAD_FILE_METHOD_DETECT) {
method = load_file_dialog.method;
load_file_dialog.method = LOAD_FILE_METHOD_NONE;
}
if (method == LOAD_FILE_METHOD_AUTOLOAD) {
/* Check that the file type is compatible with the machine model */
if ((*sdl_emulator.model == MODEL_ZX80 &&
(sdl_filetype_casecmp(sdl_com_line.filename, ".o") == 0 ||
sdl_filetype_casecmp(sdl_com_line.filename, ".80") == 0)) ||
(((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K)) &&
(sdl_filetype_casecmp(sdl_com_line.filename, ".p") == 0 ||
sdl_filetype_casecmp(sdl_com_line.filename, ".81") == 0)) ||
(sdl_filetype_casecmp(sdl_com_line.filename, ".p81") == 0)) {
/* Copy the filename to fullpath which we'll be using below */
strcpy(fullpath, sdl_com_line.filename);
} else {
fprintf(stderr, "%s: File type is incompatible with machine model.\n",
__func__);
retval = TRUE;
}
} else if (method == LOAD_FILE_METHOD_FORCEDLOAD) {
#ifdef __amigaos4__
strcpy(fullpath, amiga_file_request_retval);
#else
/* Build a path from the last entered directory */
strcpy(fullpath, load_file_dialog.dir);
/* Add a directory delimiter if required */
strcatdelimiter(fullpath);
/* Add load_file_dialog.selected item */
strcat(fullpath, load_file_dialog.dirlist +
load_file_dialog.dirlist_selected * load_file_dialog.dirlist_sizeof);
#endif
} else if (method == LOAD_FILE_METHOD_SELECTLOAD) {
/* Let the load file dialog know what we are doing */
load_file_dialog.method = method;
#ifdef __amigaos4__
/* This will return NULL if the user cancelled */
if ((amiga_file_request_retval = amiga_file_request("SZ81: Load file", FALSE)) != NULL)
load_file_dialog.method = LOAD_FILE_METHOD_SELECTLOADOK;
#else
/* Show the load file dialog */
toggle_ldfile_state();
/* Wait for the user to select Load or Exit
* which will close the dialog */
emulator_hold(&load_file_dialog.state);
#endif
/* If Load was selected then the method will have been updated */
if (load_file_dialog.method == LOAD_FILE_METHOD_SELECTLOADOK) {
#ifdef __amigaos4__
strcpy(fullpath, amiga_file_request_retval);
#else
/* Build a path from the last entered directory */
strcpy(fullpath, load_file_dialog.dir);
/* Add a directory delimiter if required */
strcatdelimiter(fullpath);
/* Add load_file_dialog.selected item */
strcat(fullpath, load_file_dialog.dirlist +
load_file_dialog.dirlist_selected * load_file_dialog.dirlist_sizeof);
#endif
} else {
retval = TRUE;
}
} else if (method == LOAD_FILE_METHOD_STATELOAD) {
/* Build a path to the currently loaded program's save state folder */
#if defined(PLATFORM_GP2X) || defined(__amigaos4__) || defined(_WIN32)
strcpy(fullpath, LOCAL_DATA_DIR);
#elif defined(PLATFORM_RISCOS)
strcpy(fullpath, riscos_prog_dir);
strcatdelimiter(fullpath);
strcat(fullpath, LOCAL_DATA_DIR);
#else
strcpy(fullpath, getenv ("HOME"));
strcatdelimiter(fullpath);
strcat(fullpath, LOCAL_DATA_DIR);
#endif
strcatdelimiter(fullpath);
strcat(fullpath, LOCAL_SAVSTA_DIR);
strcatdelimiter(fullpath);
fullpath[index = strlen(fullpath)] =
tolower(file_dialog_basename(load_file_dialog.loaded)[0]);
fullpath[++index] = 0;
strcatdelimiter(fullpath);
strcat(fullpath, file_dialog_basename(load_file_dialog.loaded));
strcatdelimiter(fullpath);
/* Form an appropriate filename */
if (*sdl_emulator.model == MODEL_ZX80) {
sprintf(filename, "savsta%i.sso", parameter + 1);
} else if ((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K)) {
sprintf(filename, "savsta%i.ssp", parameter + 1);
}
/* Append filename to fullpath */
strcat(fullpath, filename);
}
if (!retval) {
if (method == LOAD_FILE_METHOD_NAMEDLOAD) {
/* Get translated program name */
strcpy(filename, strzx81_to_ascii(parameter));
#ifdef DEBUG_LOAD_SAVE
fprintf(stderr, "Named load: %s\n", filename);
#endif
extend = strrchr(filename, ';');
if (extend) {
// Terminate the file name
*extend++ = '\0';
// Attempt to read the start address
if (!parseNumber(extend, 0, 65535, 0, (unsigned int*)&start))
{
fprintf(stderr, "Mem load address parse error, generating error 1\n");
ERROR_INV1();
retval = TRUE;
}
else if (start >= (0x4000 + sdl_emulator.ramsize * 0x400)) {
// start address cannot be greater than top of RAM
fprintf(stderr, "Mem load address %i higher than top of RAM, generating error 3\n", start);
ERROR_INV3();
retval = TRUE;
}
}
else {
/* Add a file extension if one hasn't already been affixed */
if (sdl_filetype_casecmp(filename, ".p") != 0 &&
sdl_filetype_casecmp(filename, ".81") != 0)
strcat(filename, ".p");
}
}
}
if (!retval) {
for (count = 0; count < 2; count++) {
if (method == LOAD_FILE_METHOD_NAMEDLOAD) {
/* Attempt to open the file firstly in lowercase and then
* in uppercase as program files are obtained in either */
/* Convert filename to uppercase on second attempt */
if (count == 1) strcpy(filename, strtoupper(filename));
/* Build a path from the last entered directory */
strcpy(fullpath, load_file_dialog.dir);
/* Add a directory delimiter if required */
strcatdelimiter(fullpath);
#if 0
/* Add the local program dir. This will only really work
* on platforms that aren't changing load_file_dialog.dir */
#ifdef __amigaos4__
strcat(fullpath, LOCAL_PROGRM_DIR);
strcatdelimiter(fullpath);
#endif
#endif
/* Add translated program name */
strcat(fullpath, filename);
}
/* Attempt to open the file */
#ifdef DEBUG_LOAD_SAVE
fprintf(stderr, "fopen: %s\n", fullpath);
#endif
if ((fp = fopen(fullpath, "rb")) != NULL) {
if (method == LOAD_FILE_METHOD_STATELOAD) {
/* Printer variables are reinitialised when a new file
* is opened on output so saving them is futile.
* Saving keyports and sound variables is unneccessary.
* signal_int_flag is being updated by the SDL timer
* likely in another thread so no point in saving that.
* refresh_screen I'm forcing to 1 anyway.
*
* To make these files platform independent I'm saving
* and restoring everything by the byte in little-endian
* format. These are the integer sizes on my development
* computer (GNU/Linux 32bit):
*
* sizeof(long) = 4 bytes
* sizeof(int) = 4 bytes
* sizeof(short) = 2 bytes
* sizeof(char) = 1 byte */
/* The entire contents of memory */
fread(mem, 1, 64 * 1024, fp); /* unsigned char */
fread_int_little_endian(&sdl_emulator.ramsize, fp);
sdl_emulator_ramsize = sdl_emulator.ramsize; // Prevent reset
/* Variables from z80.h */
fread_unsigned_long_little_endian(&frames, fp);
fread_int_little_endian(&framewait, fp);
fread_int_little_endian(&vsx, fp);
fread_int_little_endian(&vsy, fp);
fread_int_little_endian(&RasterX, fp);
fread_int_little_endian(&RasterY, fp);
fread_int_little_endian(&S_RasterX, fp);
fread_int_little_endian(&S_RasterY, fp);
fread_int_little_endian(&nmi_pending, fp);
fread_int_little_endian(&hsync_pending, fp);
fread_int_little_endian(&NMI_generator, fp);
fread_int_little_endian(&VSYNC_state, fp);
fread_int_little_endian(&HSYNC_state, fp);
fread_int_little_endian(&SYNC_signal, fp);
fread_int_little_endian(&psync, fp);
fread_int_little_endian(&sync_len, fp);
fread_int_little_endian(&rowcounter, fp);
fread_int_little_endian(&hsync_counter, fp);
fread_int_little_endian(&VSYNC_TOLERANCEMIN, fp);
fread_int_little_endian(&VSYNC_TOLERANCEMAX, fp);
fread_int_little_endian(&FRAME_SCAN, fp);
fread(&rowcounter_hold, 1, 1, fp);
fread(&running_rom, 1, 1, fp);
fread(&frameNotSync, 1, 1, fp);
/* Z80 Registers */
fread(&a, 1, 1, fp); /* unsigned char */
fread(&f, 1, 1, fp);
fread(&b, 1, 1, fp);
fread(&c, 1, 1, fp);
fread(&d, 1, 1, fp);
fread(&e, 1, 1, fp);
fread(&h, 1, 1, fp);
fread(&l, 1, 1, fp);
fread(&r, 1, 1, fp);
fread(&a1, 1, 1, fp);
fread(&f1, 1, 1, fp);
fread(&b1, 1, 1, fp);
fread(&c1, 1, 1, fp);
fread(&d1, 1, 1, fp);
fread(&e1, 1, 1, fp);
fread(&h1, 1, 1, fp);
fread(&l1, 1, 1, fp);
fread(&i, 1, 1, fp);
fread(&iff1, 1, 1, fp);
fread(&iff2, 1, 1, fp);
fread(&im, 1, 1, fp);
fread_unsigned_short_little_endian(&pc, fp);
fread_unsigned_short_little_endian(&ix, fp);
fread_unsigned_short_little_endian(&iy, fp);
fread_unsigned_short_little_endian(&sp, fp);
fread_unsigned_short_little_endian(&m1cycles, fp);
fread(&radjust, 1, 1, fp); /* unsigned char */
fread(&ixoriy, 1, 1, fp); /* unsigned char */
fread(&new_ixoriy, 1, 1, fp);
fread(&intsample, 1, 1, fp);
fread(&op, 1, 1, fp);
fread_int_little_endian(&scanlineCounter, fp);
fread_int_little_endian(&videoFlipFlop1Q, fp);
fread_int_little_endian(&videoFlipFlop2Q, fp);
fread_int_little_endian(&videoFlipFlop3Q, fp);
fread_int_little_endian(&videoFlipFlop3Clear, fp);
fread_int_little_endian(&prevVideoFlipFlop3Q, fp);
fread_int_little_endian(&lineClockCarryCounter, fp);
fread_int_little_endian(&scanline_len, fp);
fread_int_little_endian(&sync_type, fp);
fread_int_little_endian(&nosync_lines, fp);
/* Variables from common.h */
fread_unsigned_long_little_endian(&tstates, fp);
fread(&UDGEnabled, 1, 1, fp);
fread_int_little_endian(&sound, fp);
fread_int_little_endian(&sound_vsync, fp);
fread_int_little_endian(&sound_ay, fp);
fread_int_little_endian(&sound_ay_type, fp);
fread_int_little_endian(&interrupted, fp);
fread_int_little_endian(&zx80, fp);
sdl_emulator_model = zx80;
fread_int_little_endian(&chromamode, fp);
fread(&bordercolour, 1, 1, fp);
fread(&bordercolournew, 1, 1, fp);
fread(&fullcolour, 1, 1, fp);
fread(&chroma_set, 1, 1, fp);
// Restore memory partition and display offsets
rom4k = (zx80 == 1) ? 1 : 0;
init_mem_structures(sdl_emulator.ramsize);
rom4k ? rom4kPatches() : rom8kPatches();
setDisplayBoundaries();
} else {
if (method == LOAD_FILE_METHOD_AUTOLOAD ||
method == LOAD_FILE_METHOD_FORCEDLOAD)
{
/* To duplicate these values: in mainloop in z80.c around
* line 189, change #if 0 to #if 1 and recompile. Run
* the emulator, load a suitably sized program by typing
* LOAD or LOAD "something" and view the console output.
*
* It's likely I've been a bit too thorough recording these
* values because I know from looking at the ZX81 ROM that
* DE points to the program name in memory which would get
* overwritten on LOAD and make it redundant, and HL and A
* are modified soon after anyway, but there's no harm done.
*
* Note that the ZX81's RAMTOP won't be greater than 0x8000
* unless POKEd by the user.
*/
if (*sdl_emulator.model == MODEL_ZX80) {
/* Registers (common values) */
a = 0x00; f = 0x44; b = 0x00; c = 0x00;
d = 0x07; e = 0xae; h = 0x40; l = 0x2a;
pc = 0x0283;
ix = 0x0000; iy = 0x4000; i = 0x0e; r = 0xdd;
a1 = 0x00; f1 = 0x00; b1 = 0x00; c1 = 0x21;
d1 = 0xd8; e1 = 0xf0; h1 = 0xd8; l1 = 0xf0;
iff1 = 0x00; iff2 = 0x00; im = 0x02;
radjust = 0x6a;
/* Machine Stack (common values) */
if (sdl_emulator.ramsize >= 16) {
sp = 0x8000 - 4;
} else {
sp = 0x4000 - 4 + sdl_emulator.ramsize * 1024;
}
mem[sp + 0] = 0x47;
mem[sp + 1] = 0x04;
mem[sp + 2] = 0xba;
mem[sp + 3] = 0x3f;
/* Now override if RAM configuration changes things
* (there's a possibility these changes are unimportant) */
if (sdl_emulator.ramsize == 16) {
mem[sp + 2] = 0x22;
}
} else if ((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K)){
/* Registers (common values) */
a = 0x0b; f = 0x00; b = 0x00; c = 0x02;
d = 0x40; e = 0x9b; h = 0x40; l = 0x99;
pc = 0x0207;
ix = 0x0281; iy = 0x4000; i = 0x1e; r = 0xdd;
a1 = 0xf8; f1 = 0xa9; b1 = 0x00; c1 = 0x00;
d1 = 0x00; e1 = 0x2b; h1 = 0x00; l1 = 0x00;
iff1 = 0; iff2 = 0; im = 2;
radjust = 0xa4;
/* GOSUB Stack (common values) */
if (sdl_emulator.ramsize >= 16) {
sp = 0x8000 - 4;
} else {
sp = 0x4000 - 4 + sdl_emulator.ramsize * 1024;
}
mem[sp + 0] = 0x76;
mem[sp + 1] = 0x06;
mem[sp + 2] = 0x00;
mem[sp + 3] = 0x3e;
/* Now override if RAM configuration changes things,
without these changes Multi-scroll sometimes fail to start */
if (sdl_emulator.ramsize >= 4) {
d = 0x43; h = 0x43;
a1 = 0xec; b1 = 0x81; c1 = 0x02;
radjust = 0xa9;
}
/* System variables */
mem[0x4000] = 0xff; /* ERR_NR */
mem[0x4001] = 0x80; /* FLAGS */
mem[0x4002] = sp & 0xff; /* ERR_SP lo */
mem[0x4003] = sp >> 8; /* ERR_SP hi */
mem[0x4004] = (sp + 4) & 0xff; /* RAMTOP lo */
mem[0x4005] = (sp + 4) >> 8; /* RAMTOP hi */
mem[0x4006] = 0x00; /* MODE */
mem[0x4007] = 0xfe; /* PPC lo */
mem[0x4008] = 0xff; /* PPC hi */
}
}
if (sdl_emulator.ramsize > 48) {
ramsize = 48;
} else {
ramsize = sdl_emulator.ramsize;
}
if (start < 0)
{
if (rom_patches.load.use_rom &&
((method == LOAD_FILE_METHOD_NAMEDLOAD) || (method == LOAD_FILE_METHOD_SELECTLOAD)))
{
repeat = true;
}
else
{
/* Read in up to 48K of data */
if (*sdl_emulator.model == MODEL_ZX80)
{
fread(mem + 0x4000, 1, ramsize * 1024, fp);
}
else if ((*sdl_emulator.model == MODEL_ZX81) || (*sdl_emulator.model == MODEL_ZX80_8K))
{
// Skip the file name if .p81
if (sdl_filetype_casecmp(fullpath, ".p81") == 0)
{
while (!(fgetc(fp) & 0x80));
}
fread(mem + 0x4009, 1, ramsize * 1024 - 9, fp);
}
}
/* Copy fullpath across to the load file dialog as
* then we have a record of what was last loaded */
strcpy(load_file_dialog.loaded, fullpath);
}
else {
// Find the size of the file
fseek(fp, 0, SEEK_END); // seek to end of file
long size = ftell(fp); // get current file pointer
fseek(fp, 0, SEEK_SET);
int orgstart = start;
#ifdef DEBUG_LOAD_SAVE
fprintf(stderr, "Request to load %i bytes to address %i from %s\n", (int)size, start, fullpath);
#endif
/* Do we need to skip the start? */
int ramstart = (LowRAM) ? 0x2000 : 0x4000;
int offset = 0;
int length = (int)size;
if (start < ramstart) {
offset = ramstart - start;
start = ramstart;
length -= offset;
}
if (length > 0) {
// Make sure don't read past end of memory
if (LowRAM) ramsize += 8;
if ((start + length) > (ramsize * 1024 + ramstart)) {
length -= ((start + length) - (ramsize * 1024 + ramstart));
}
if (length > 0) {
if (offset) fseek(fp, offset, SEEK_SET);
fread(mem + start, 1, length, fp);
#ifdef DEBUG_LOAD_SAVE
fprintf(stderr, "Load %i bytes to address %i from %s\n", length, start, fullpath);
#endif
}
}
// Report error if nothing was loaded
if (length <= 0) {
fprintf(stderr, "Error 3, No memory to load. Load Addr %i Length %i Mem Start %i\n",
orgstart, (int)size, ramstart);
ERROR_INV3();
retval = TRUE;
}
}
}
/* Close the file now as we've finished with it */
fclose(fp);
break;
} else {
if (!(method == LOAD_FILE_METHOD_NAMEDLOAD)){
retval = TRUE;
break;
}
else if (count == 1) {
ERROR_D();
retval = TRUE;
}
}
}
if (retval)
{
if (method == LOAD_FILE_METHOD_AUTOLOAD)
{
fprintf(stderr, "%s: Cannot read from %s\n", __func__, fullpath);
}
else
{
if (method == LOAD_FILE_METHOD_NAMEDLOAD ||
method == LOAD_FILE_METHOD_SELECTLOAD ||
method == LOAD_FILE_METHOD_FORCEDLOAD ||
method == LOAD_FILE_METHOD_STATELOAD)
{
/* Warn the user via the GUI that the load failed */
if (method == LOAD_FILE_METHOD_STATELOAD)
{
strcpy(notification.title, "Load State");
} else
{
strcpy(notification.title, "Load");
}