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rockbox/apps/plugins/zxbox/snapshot.c
Amaury Pouly d7871914ac Fix dangerous casts 
On Windows 64-bit, the size of long is 32-bit, thus any pointer to long cast is
not valid. In any case, one should use intptr_t and ptrdiff_t when casting
to integers. This commit attempts to fix all instances reported by GCC.
When relevant, I replaced code by the macros PTR_ADD, ALIGN_UP from system.h

Change-Id: I2273b0e8465d3c4689824717ed5afa5ed238a2dc
2017-02-04 17:24:47 +01:00

700 lines
15 KiB
C
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/*
* Copyright (C) 1996-1998 Szeredi Miklos
* Email: mszeredi@inf.bme.hu
*
* 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. See the file COPYING.
*
* 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.
*
*/
#include <stdlib.h>
#include <string.h> /* size_t */
#include "zxmisc.h"
#include "spperif.h"
#include "z80.h"
#include "snapshot.h"
#include "compr.h"
#include "interf.h"
#include "spconf.h"
/* include this at last to avoid clashes with stdio functions */
#include "helpers.h"
#define COMPRESS_SAVE 1
static char quick_snap_file[]= ROCKBOX_DIR "/zxboxq.z80";
typedef struct {
int isfile;
int fd;
unsigned len;
byte *at;
} SNFILE;
#define sngetc(snfp) ((snfp)->isfile ? getc((snfp)->fd) : snmgetc(snfp))
static int snmgetc(SNFILE *snfp)
{
if(!snfp->len) return EOF;
snfp->len--;
return *snfp->at++;
}
static int snread(void *ptr, int size, SNFILE *snfp)
{
int i;
byte *dest;
if(snfp->isfile)
return (int) rb->read( snfp->fd,ptr, (size_t) size);
dest = (byte *) ptr;
for(i = 0; snfp->len && size; i++, snfp->len--, size--)
*dest++ = *snfp->at++;
return i;
}
/* These structures are taken from 'spconv' by Henk de Groot */
struct sna_s {
byte i;
byte lbk;
byte hbk;
byte ebk;
byte dbk;
byte cbk;
byte bbk;
byte fbk;
byte abk;
byte l;
byte h;
byte e;
byte d;
byte c;
byte b;
byte iyl;
byte iyh;
byte ixl;
byte ixh;
byte iff2;
byte r;
byte f;
byte a;
byte spl;
byte sph;
byte im;
byte border;
};
#define sna_size 27 /* sizeof(struct sna_s)=27 */
struct z80_1_s {
byte a; /*00*/
byte f; /*01*/
byte c; /*02*/
byte b; /*03*/
byte l; /*04*/
byte h; /*05*/
byte pcl; /*06*/
byte pch; /*07*/
byte spl; /*08*/
byte sph; /*09*/
byte i; /*0A*/
byte r; /*0B*/
byte data; /*0C*/
byte e; /*0D*/
byte d; /*0E*/
byte cbk; /*0F*/
byte bbk; /*10*/
byte ebk; /*11*/
byte dbk; /*12*/
byte lbk; /*13*/
byte hbk; /*14*/
byte abk; /*15*/
byte fbk; /*16*/
byte iyl; /*17*/
byte iyh; /*18*/
byte ixl; /*19*/
byte ixh; /*1A*/
byte iff1; /*1B*/
byte iff2; /*1C*/
byte im; /*1D*/
};
#define z80_145_size 0x1e /* length of z80 V1.45 header */
struct z80_2_s {
/* Extended 2.01 and 3.0 header, flagged with PC=0 */
byte h2_len_l; /*1E*/
byte h2_len_h; /*1F*/
byte n_pcl; /*20*/
byte n_pch; /*21*/
byte hardware; /*22*/
byte samram; /*23*/
byte if1_paged; /*24*/
byte r_ldir_emu; /*25*/
byte last_out; /*26*/
byte sound_reg[16]; /*27*/
/* Continues with extended 3.0 header, but this part is not used anyway */
};
#define z80_201_ext_size 23 /* length of extended z80 V2.01 header */
#define z80_300_ext_size 54 /* length of extended z80 V3.0 header */
struct z80_page_s {
byte blklen_l; /*00*/
byte blklen_h; /*01*/
byte page_num; /*02*/
};
#define z80_pg_size 3 /* sizeof(struct z80_page_s)=3 */
static int savfd;
static int memptr;
int compr_read_byte(void)
{
if(memptr < 0x10000) return z80_proc.mem[memptr++];
else return -1;
}
void compr_put_byte(int i)
{
putc(i, savfd);
}
#define STORE_NORMAL_REGS(head) \
head.f = RF; /* F reg */ \
head.a = RA; /* A reg */ \
head.b = RB; /* B reg */ \
head.c = RC; /* C reg */ \
head.d = RD; /* D reg */ \
head.e = RE; /* E reg */ \
head.h = RH; /* H reg */ \
head.l = RL; /* L reg */ \
head.fbk = FBK; /* F' reg */ \
head.abk = ABK; /* A' reg */ \
head.bbk = BBK; /* B' reg */ \
head.cbk = CBK; /* C' reg */ \
head.dbk = DBK; /* D' reg */ \
head.ebk = EBK; /* E' reg */ \
head.hbk = HBK; /* H' reg */ \
head.lbk = LBK; /* L' reg */ \
head.iyh = YH; /* IY reg */ \
head.iyl = YL; \
head.ixh = XH; /* IX reg */ \
head.ixl = XL
#define LOAD_NORMAL_REGS(head) \
RF = head.f; /* F reg */ \
RA = head.a; /* A reg */ \
RB = head.b; /* B reg */ \
RC = head.c; /* C reg */ \
RD = head.d; /* D reg */ \
RE = head.e; /* E reg */ \
RH = head.h; /* H reg */ \
RL = head.l; /* L reg */ \
FBK = head.fbk; /* F' reg */ \
ABK = head.abk; /* A' reg */ \
BBK = head.bbk; /* B' reg */ \
CBK = head.cbk; /* C' reg */ \
DBK = head.dbk; /* D' reg */ \
EBK = head.ebk; /* E' reg */ \
HBK = head.hbk; /* H' reg */ \
LBK = head.lbk; /* L' reg */ \
YH = head.iyh; /* IY reg */ \
YL = head.iyl; \
XH = head.ixh; /* IX reg */ \
XL = head.ixl
static void snsh_z80_save(int fd)
{
struct z80_1_s z80;
int to_comp = COMPRESS_SAVE;
STORE_NORMAL_REGS(z80);
z80.i = RI; /* I reg */
z80.r = RR; /* R reg */
z80.sph = SPH; /* SP reg */
z80.spl = SPL;
z80.pch = PCH; /* PC reg */
z80.pcl = PCL;
z80.iff1 = z80_proc.iff1; /* iff1 */
z80.iff2 = z80_proc.iff2; /* iff2 */
z80.im = (z80_proc.it_mode & 0x03) | 0x60;
/*
Bit 0-1: Interrupt mode (0, 1 or 2)
Bit 2 : 1=Issue 2 emulation
Bit 3 : 1=Double interrupt frequency
Bit 4-5: 1=High video synchronisation
3=Low video synchronisation
0,2=Normal
Bit 6-7: 0=Cursor/Protek/AGF joystick
1=Kempston joystick
2=Sinclair 1 joystick
3=Sinclair 2 joystick
*/
z80.data = ((RR >> 7) & 0x01) |
((z80_proc.ula_outport & 0x07) << 1) |
(to_comp ? 0x20 : 0);
/*
Bit 0 : Bit 7 of the R-register
Bit 1-3: Border colour
Bit 4 : 1=Basic SamRom switched in
Bit 5 : 1=Block of data is compressed
Bit 6-7: No meaning
*/
rb->write(fd,&z80,z80_145_size);
if(!to_comp)
rb->write(fd,z80_proc.mem + 0x4000,0xC000);
else {
memptr = 0x4000;
savfd = fd;
compr();
}
}
static void snsh_sna_save(int fd)
{
struct sna_s sna;
byte saves1, saves2;
STORE_NORMAL_REGS(sna);
sna.i = RI; /* I reg */
sna.r = RR; /* R reg */
sna.border = z80_proc.ula_outport & 0x07;
SP -= 2;
sna.sph = SPH; /* SP reg */
sna.spl = SPL;
saves1 = z80_proc.mem[SP];
saves2 = z80_proc.mem[(dbyte)(SP+1)];
if(SP >= 0x4000) {
z80_proc.mem[SP] = PCL;
if(SP < 0xFFFF) z80_proc.mem[SP+1] = PCH;
}
sna.iff2 = z80_proc.iff2 ? 0xff : 0x00; /* iff2 */
sna.im = z80_proc.it_mode & 0x03;
rb->write(fd,&sna, sna_size);
rb->write(fd,z80_proc.mem + 0x4000, 0xC000);
if(SP > 0x4000) {
z80_proc.mem[SP] = saves1;
if(SP < 0xFFFF) z80_proc.mem[SP+1] = saves2;
}
SP += 2;
}
#define GET_DATA(c) { \
if(!datalen) break; \
c = sngetc(fp); \
if(c == EOF) break; \
if(datalen > 0) datalen--; \
}
static void read_compressed_data(SNFILE *fp, byte *start, unsigned size,
long datalen)
{
int j;
int times, last_ed, ch;
byte *p, *end;
p = start;
end = start+size;
last_ed = 0;
while(p < end) {
GET_DATA(ch);
if(ch != 0xED) {
last_ed = 0;
*p++ = ch;
}
else {
if(last_ed) {
last_ed = 0;
p--;
GET_DATA(times);
if(times == 0) break;
GET_DATA(ch);
if(p + times > end) {
put_msg("Warning: Repeat parameter too large in snapshot");
times = (int) ((intptr_t) end - (intptr_t) p);
}
for(j = 0; j < times; j++) *p++ = ch;
}
else {
last_ed = 1;
*p++ = 0xED;
}
}
}
if(datalen < 0) {
if(sngetc(fp) != 0 || sngetc(fp) != 0xED ||
sngetc(fp) != 0xED || sngetc(fp) != 0)
put_msg("Warning: Illegal ending of snapshot");
}
if(datalen > 0) {
while(datalen) {
if(sngetc(fp) == EOF) break;
datalen--;
}
put_msg("Warning: Page too long in snapshot");
}
if(p < end) put_msg("Warning: Page too short in snapshot");
}
static int read_header(void *p, int size, SNFILE *fp)
{
int res;
res = snread(p, size, fp);
if(res != size) {
put_msg("Error, End Of File in snapshot header");
return 0;
}
return 1;
}
static int read_z80_page(SNFILE *fp)
{
struct z80_page_s page;
unsigned datalen;
unsigned pos = 0;
int validpage;
int res;
res = snread(&page, z80_pg_size, fp);
if(res == 0) return 0;
if(res != z80_pg_size) {
put_msg("Error, End Of File in page header");
return 0;
}
datalen = (page.blklen_h << 8) | page.blklen_l;
validpage = 1;
switch(page.page_num) {
case 4:
pos = 0x8000;
break;
case 5:
pos = 0xC000;
break;
case 8:
pos = 0x4000;
break;
default:
validpage = 0;
while(datalen) {
if(sngetc(fp) == EOF) {
put_msg("Warning: Page too short in snapshot");
break;
}
datalen--;
}
}
if(validpage) read_compressed_data(fp, z80_proc.mem+pos, 0x4000,
(long) datalen);
return 1;
}
static void snsh_z80_load(SNFILE *fp)
{
struct z80_1_s z80;
if(!read_header(&z80, z80_145_size, fp)) return;
if(z80.pch == 0 && z80.pcl == 0) {
struct z80_2_s z80_2;
int ext_size, rem;
if(!read_header(&z80_2, 2, fp)) return;
ext_size = z80_2.h2_len_l | (z80_2.h2_len_h << 8);
if(ext_size < z80_201_ext_size) {
put_msg("Error in Z80 header");
return;
}
if(!read_header(&z80_2.n_pcl, z80_201_ext_size, fp)) return;
rem = ext_size - z80_201_ext_size;
for(; rem; rem--) sngetc(fp);
if(z80_2.hardware >= 3 && (ext_size == z80_201_ext_size ||
z80_2.hardware >= 4)) {
put_msg("Can't load non 48k snapshot");
return;
}
if(z80_2.if1_paged) {
put_msg("Can't load snapshot: IF1 roma paged in");
return;
}
PCH = z80_2.n_pch;
PCL = z80_2.n_pcl;
while(read_z80_page(fp));
}
else {
if(z80.data == 0xFF) z80.data = 1;
if(z80.data & 0x20)
read_compressed_data(fp, z80_proc.mem + 0x4000, 0xC000, -1);
else {
if(snread(z80_proc.mem + 0x4000, 0xC000, fp) != 0xC000)
put_msg("Warning: Snapshot file too short (z80)");
else if(sngetc(fp) != EOF)
put_msg("Warning: Snapshot file too long");
}
PCH = z80.pch;
PCL = z80.pcl;
}
LOAD_NORMAL_REGS(z80);
RI = z80.i; /* I reg */
RR = (z80.r & 0x7F) | ((z80.data & 0x01) << 7); /* R reg */
SPH = z80.sph; /* SP reg */
SPL = z80.spl;
z80_proc.ula_outport = (z80_proc.ula_outport & ~(0x07)) |
((z80.data >> 1) & 0x07);
/*
Bit 0 : Bit 7 of the R-register
Bit 1-3: Border colour
Bit 4 : 1=Basic SamRom switched in
Bit 5 : 1=Block of data is compressed
Bit 6-7: No meaning
*/
z80_proc.iff1 = z80.iff1 ? 1 : 0;
z80_proc.iff2 = z80.iff2 ? 1 : 0;
z80_proc.it_mode = z80.im & 0x03;
/*
Bit 0-1: Interrupt mode (0, 1 or 2)
Bit 2 : 1=Issue 2 emulation
Bit 3 : 1=Double interrupt frequency
Bit 4-5: 1=High video synchronisation
3=Low video synchronisation
0,2=Normal
Bit 6-7: 0=Cursor/Protek/AGF joystick
1=Kempston joystick
2=Sinclair 1 joystick
3=Sinclair 2 joystick
*/
z80_proc.haltstate = 0;
sp_init_screen_mark();
}
static void snsh_sna_load(SNFILE *fp)
{
struct sna_s sna;
if(!read_header(&sna, sna_size, fp)) return;
if(snread(z80_proc.mem+0x4000, 0xC000, fp) != 0xC000)
put_msg("Warning: Snapshot file too short (sna)");
else if(sngetc(fp) != EOF)
put_msg("Warning: Snapshot file too long");
LOAD_NORMAL_REGS(sna);
RI = sna.i; /* I reg */
RR = sna.r; /* R reg */
z80_proc.ula_outport = (z80_proc.ula_outport & ~(0x07)) |
(sna.border & 0x07);
SPH = sna.sph; /* SP reg */
SPL = sna.spl;
PCL = z80_proc.mem[SP];
if(SP >= 0x4000) z80_proc.mem[SP] = 0;
SP++;
PCH = z80_proc.mem[SP];
if(SP >= 0x4000) z80_proc.mem[SP] = 0;
SP++;
z80_proc.iff1 = z80_proc.iff2 = sna.iff2 ? 1 : 0;
z80_proc.it_mode = sna.im & 0x03;
z80_proc.haltstate = 0;
sp_init_screen_mark();
}
static void save_snapshot_file_type(char *name, int type)
{
int snsh;
snsh = rb->open(name, O_WRONLY);
if(snsh < 0) {
snsh = rb->creat(name, 0666);
if(snsh < 0) {
put_msg("Could not create snapshot file");
return;
}
}
if(type == SN_SNA) snsh_sna_save(snsh);
else if(type == SN_Z80) snsh_z80_save(snsh);
rb->close(snsh);
}
void save_snapshot_file(char *name)
{
int type;
rb->strlcpy(filenamebuf, name, MAXFILENAME-10 + 1);
type = SN_Z80;
if(check_ext(filenamebuf, "z80")) type = SN_Z80;
else if(check_ext(filenamebuf, "sna")) type = SN_SNA;
else {
add_extension(filenamebuf, "z80");
type = SN_Z80;
}
save_snapshot_file_type(filenamebuf, type);
char msgbuf [MAXFILENAME];
rb->snprintf(msgbuf,MAXFILENAME, "Saved snapshot to file %s", filenamebuf);
put_msg(msgbuf);
}
void save_quick_snapshot(void)
{
save_snapshot_file_type(quick_snap_file, SN_Z80);
}
void save_snapshot(void)
{
char name[MAXFILENAME];
name[0]='/';
name[1]='\0';
put_msg("Enter name of snapshot file to save:");
if (!rb->kbd_input((char*)&name, sizeof name))
save_snapshot_file(&name[0]);
}
void load_snapshot_file_type(char *name, int type)
{
int filetype = FT_SNAPSHOT;
int snsh;
SNFILE snfil;
rb->strlcpy(filenamebuf, name, MAXFILENAME-10 + 1);
spcf_find_file_type(filenamebuf, &filetype, &type);
if(type < 0) type = SN_Z80;
snsh = rb->open(filenamebuf, O_RDONLY);
if(snsh < 0) {
#ifndef USE_GRAY
rb->splashf(HZ, "Could not open snapshot file `%s'",filenamebuf);
#endif
return;
}
snfil.isfile = 1;
snfil.fd = snsh;
if(type == SN_SNA) snsh_sna_load(&snfil);
else if(type == SN_Z80) snsh_z80_load(&snfil);
rb->close(snsh);
}
void snsh_z80_load_intern(byte *p, unsigned len)
{
SNFILE snfil;
snfil.isfile = 0;
snfil.at = p;
snfil.len = len;
snsh_z80_load(&snfil);
}
void load_quick_snapshot(void)
{
int qsnap;
qsnap = rb->open(quick_snap_file,O_RDONLY);
if(qsnap < 0) {
put_msg("No quick snapshot saved yet");
return;
}
else
rb->close ( qsnap );
load_snapshot_file_type(quick_snap_file, SN_Z80);
}
void load_snapshot(void)
{
char *name;
put_msg("Enter name of snapshot file to load:");
name = spif_get_filename();
if(name == NULL) return;
load_snapshot_file_type(name, -1);
}
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