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inform7/inform6/Tests/Assistants/dumb-frotz/fastmem.c
Graham Nelson 114e94f090 Initial commit
2019-02-05 00:44:07 +00:00

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/*
* fastmem.c
*
* Memory related functions (fast version without virtual memory)
*
*/
#include <stdio.h>
#include <string.h>
#include "frotz.h"
#ifdef __MSDOS__
#include <alloc.h>
#define malloc(size) farmalloc (size)
#define realloc(size,p) farrealloc (size,p)
#define free(size) farfree (size)
#define memcpy(d,s,n) _fmemcpy (d,s,n)
#else
#include <stdlib.h>
#ifndef SEEK_SET
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif
#define far
#endif
extern void seed_random (int);
extern void restart_screen (void);
extern void refresh_text_style (void);
extern void call (zword, int, zword *, int);
extern void split_window (zword);
extern void script_open (void);
extern void script_close (void);
extern void (*op0_opcodes[]) (void);
extern void (*op1_opcodes[]) (void);
extern void (*op2_opcodes[]) (void);
extern void (*var_opcodes[]) (void);
char save_name[MAX_FILE_NAME + 1] = DEFAULT_SAVE_NAME;
char auxilary_name[MAX_FILE_NAME + 1] = DEFAULT_AUXILARY_NAME;
zbyte far *zmp = NULL;
zbyte far *pcp = NULL;
static FILE *story_fp = NULL;
static zbyte far *undo[MAX_UNDO_SLOTS];
static undo_slots = 0;
static undo_count = 0;
static undo_valid = 0;
/*
* get_header_extension
*
* Read a value from the header extension (former mouse table).
*
*/
zword get_header_extension (int entry)
{
zword addr;
zword val;
if (h_extension_table == 0 || entry > hx_table_size)
return 0;
addr = h_extension_table + 2 * entry;
LOW_WORD (addr, val)
return val;
}/* get_header_extension */
/*
* set_header_extension
*
* Set an entry in the header extension (former mouse table).
*
*/
void set_header_extension (int entry, zword val)
{
zword addr;
if (h_extension_table == 0 || entry > hx_table_size)
return;
addr = h_extension_table + 2 * entry;
SET_WORD (addr, val)
}/* set_header_extension */
/*
* restart_header
*
* Set all header fields which hold information about the interpreter.
*
*/
void restart_header (void)
{
zword screen_x_size;
zword screen_y_size;
zbyte font_x_size;
zbyte font_y_size;
int i;
SET_BYTE (H_CONFIG, h_config)
SET_WORD (H_FLAGS, h_flags)
if (h_version >= V4) {
SET_BYTE (H_INTERPRETER_NUMBER, h_interpreter_number)
SET_BYTE (H_INTERPRETER_VERSION, h_interpreter_version)
SET_BYTE (H_SCREEN_ROWS, h_screen_rows)
SET_BYTE (H_SCREEN_COLS, h_screen_cols)
}
/* It's less trouble to use font size 1x1 for V5 games, especially
because of a bug in the unreleased German version of "Zork 1" */
if (h_version != V6) {
screen_x_size = (zword) h_screen_cols;
screen_y_size = (zword) h_screen_rows;
font_x_size = 1;
font_y_size = 1;
} else {
screen_x_size = h_screen_width;
screen_y_size = h_screen_height;
font_x_size = h_font_width;
font_y_size = h_font_height;
}
if (h_version >= V5) {
SET_WORD (H_SCREEN_WIDTH, screen_x_size)
SET_WORD (H_SCREEN_HEIGHT, screen_y_size)
SET_BYTE (H_FONT_HEIGHT, font_y_size)
SET_BYTE (H_FONT_WIDTH, font_x_size)
SET_BYTE (H_DEFAULT_BACKGROUND, h_default_background)
SET_BYTE (H_DEFAULT_FOREGROUND, h_default_foreground)
}
if (h_version == V6)
for (i = 0; i < 8; i++)
storeb ((zword) (H_USER_NAME + i), h_user_name[i]);
SET_BYTE (H_STANDARD_HIGH, h_standard_high)
SET_BYTE (H_STANDARD_LOW, h_standard_low)
}/* restart_header */
/*
* init_memory
*
* Allocate memory and load the story file.
*
*/
void init_memory (void)
{
long size;
zword addr;
unsigned n;
int i, j;
static struct {
enum story story_id;
zword release;
zbyte serial[6];
} records[] = {
{ SHERLOCK, 21, "871214" },
{ SHERLOCK, 26, "880127" },
{ BEYOND_ZORK, 47, "870915" },
{ BEYOND_ZORK, 49, "870917" },
{ BEYOND_ZORK, 51, "870923" },
{ BEYOND_ZORK, 57, "871221" },
{ ZORK_ZERO, 296, "881019" },
{ ZORK_ZERO, 366, "890323" },
{ ZORK_ZERO, 383, "890602" },
{ ZORK_ZERO, 393, "890714" },
{ SHOGUN, 292, "890314" },
{ SHOGUN, 295, "890321" },
{ SHOGUN, 311, "890510" },
{ SHOGUN, 322, "890706" },
{ ARTHUR, 54, "890606" },
{ ARTHUR, 63, "890622" },
{ ARTHUR, 74, "890714" },
{ JOURNEY, 26, "890316" },
{ JOURNEY, 30, "890322" },
{ JOURNEY, 77, "890616" },
{ JOURNEY, 83, "890706" },
{ LURKING_HORROR, 203, "870506" },
{ LURKING_HORROR, 219, "870912" },
{ LURKING_HORROR, 221, "870918" },
{ UNKNOWN, 0, "------" }
};
/* Open story file */
if ((story_fp = fopen (story_name, "rb")) == NULL)
os_fatal ("Cannot open story file");
/* Allocate memory for story header */
if ((zmp = (zbyte far *) malloc (64)) == NULL)
os_fatal ("Out of memory");
/* Load header into memory */
if (fread (zmp, 1, 64, story_fp) != 64)
os_fatal ("Story file read error");
/* Copy header fields to global variables */
LOW_BYTE (H_VERSION, h_version)
if (h_version < V1 || h_version > V8)
os_fatal ("Unknown Z-code version");
LOW_BYTE (H_CONFIG, h_config)
if (h_version == V3 && (h_config & CONFIG_BYTE_SWAPPED))
os_fatal ("Byte swapped story file");
LOW_WORD (H_RELEASE, h_release)
LOW_WORD (H_RESIDENT_SIZE, h_resident_size)
LOW_WORD (H_START_PC, h_start_pc)
LOW_WORD (H_DICTIONARY, h_dictionary)
LOW_WORD (H_OBJECTS, h_objects)
LOW_WORD (H_GLOBALS, h_globals)
LOW_WORD (H_DYNAMIC_SIZE, h_dynamic_size)
LOW_WORD (H_FLAGS, h_flags)
for (i = 0, addr = H_SERIAL; i < 6; i++, addr++)
LOW_BYTE (addr, h_serial[i])
/* Auto-detect buggy story files that need special fixes */
for (i = 0; records[i].story_id != UNKNOWN; i++) {
if (h_release == records[i].release) {
for (j = 0; j < 6; j++)
if (h_serial[j] != records[i].serial[j])
goto no_match;
story_id = records[i].story_id;
}
no_match: ;
}
LOW_WORD (H_ABBREVIATIONS, h_abbreviations)
LOW_WORD (H_FILE_SIZE, h_file_size)
/* Calculate story file size in bytes */
if (h_file_size != 0) {
story_size = (long) 2 * h_file_size;
if (h_version >= V4)
story_size *= 2;
if (h_version >= V6)
story_size *= 2;
} else { /* some old games lack the file size entry */
fseek (story_fp, 0, SEEK_END);
story_size = ftell (story_fp);
fseek (story_fp, 64, SEEK_SET);
}
LOW_WORD (H_CHECKSUM, h_checksum)
LOW_WORD (H_ALPHABET, h_alphabet)
LOW_WORD (H_FUNCTIONS_OFFSET, h_functions_offset)
LOW_WORD (H_STRINGS_OFFSET, h_strings_offset)
LOW_WORD (H_TERMINATING_KEYS, h_terminating_keys)
LOW_WORD (H_EXTENSION_TABLE, h_extension_table)
/* Zork Zero Macintosh doesn't have the graphics flag set */
if (story_id == ZORK_ZERO && h_release == 296)
h_flags |= GRAPHICS_FLAG;
/* Adjust opcode tables */
if (h_version <= V4) {
op0_opcodes[0x09] = z_pop;
op1_opcodes[0x0f] = z_not;
} else {
op0_opcodes[0x09] = z_catch;
op1_opcodes[0x0f] = z_call_n;
}
/* Allocate memory for story data */
if ((zmp = (zbyte far *) realloc (zmp, story_size)) == NULL)
os_fatal ("Out of memory");
/* Load story file in chunks of 32KB */
n = 0x8000;
for (size = 64; size < story_size; size += n) {
if (story_size - size < 0x8000)
n = (unsigned) (story_size - size);
SET_PC (size)
if (fread (pcp, 1, n, story_fp) != n)
os_fatal ("Story file read error");
}
/* Read header extension table */
hx_table_size = get_header_extension (HX_TABLE_SIZE);
hx_unicode_table = get_header_extension (HX_UNICODE_TABLE);
}/* init_memory */
/*
* init_undo
*
* Allocate memory for multiple undo. It is important not to occupy
* all the memory available, since the IO interface may need memory
* during the game, e.g. for loading sounds or pictures.
*
*/
void init_undo (void)
{
void far *reserved;
if (reserve_mem != 0)
if ((reserved = malloc (reserve_mem)) == NULL)
return;
while (undo_slots < option_undo_slots && undo_slots < MAX_UNDO_SLOTS) {
void far *mem = malloc ((long) sizeof (stack) + h_dynamic_size);
if (mem == NULL)
break;
undo[undo_slots++] = mem;
}
if (reserve_mem != 0)
free (reserved);
}/* init_undo */
/*
* reset_memory
*
* Close the story file and deallocate memory.
*
*/
void reset_memory (void)
{
fclose (story_fp);
while (undo_slots--)
free (undo[undo_slots]);
free (zmp);
}/* reset_memory */
/*
* storeb
*
* Write a byte value to the dynamic Z-machine memory.
*
*/
void storeb (zword addr, zbyte value)
{
if (addr >= h_dynamic_size)
runtime_error ("Store out of dynamic memory");
if (addr == H_FLAGS + 1) { /* flags register is modified */
h_flags &= ~(SCRIPTING_FLAG | FIXED_FONT_FLAG);
h_flags |= value & (SCRIPTING_FLAG | FIXED_FONT_FLAG);
if (value & SCRIPTING_FLAG) {
if (!ostream_script)
script_open ();
} else {
if (ostream_script)
script_close ();
}
refresh_text_style ();
}
SET_BYTE (addr, value)
}/* storeb */
/*
* storew
*
* Write a word value to the dynamic Z-machine memory.
*
*/
void storew (zword addr, zword value)
{
storeb ((zword) (addr + 0), hi (value));
storeb ((zword) (addr + 1), lo (value));
}/* storew */
/*
* z_restart, re-load dynamic area, clear the stack and set the PC.
*
* no zargs used
*
*/
void z_restart (void)
{
static bool first_restart = TRUE;
flush_buffer ();
os_restart_game (RESTART_BEGIN);
seed_random (0);
if (!first_restart) {
fseek (story_fp, 0, SEEK_SET);
if (fread (zmp, 1, h_dynamic_size, story_fp) != h_dynamic_size)
os_fatal ("Story file read error");
}
restart_header ();
restart_screen ();
sp = fp = stack + STACK_SIZE;
if (h_version != V6) {
long pc = (long) h_start_pc;
SET_PC (pc)
} else call (h_start_pc, 0, NULL, 0);
if (first_restart && option_profiling) {
long pc;
GET_PC (pc)
prof_enter(pc);
}
first_restart = FALSE;
os_restart_game (RESTART_END);
}/* z_restart */
/*
* get_default_name
*
* Read a default file name from the memory of the Z-machine and
* copy it to a string.
*
*/
static void get_default_name (char *default_name, zword addr)
{
if (addr != 0) {
zbyte len;
int i;
LOW_BYTE (addr, len)
addr++;
for (i = 0; i < len; i++) {
zbyte c;
LOW_BYTE (addr, c)
addr++;
if (c >= 'A' && c <= 'Z')
c += 'a' - 'A';
default_name[i] = c;
}
default_name[i] = 0;
if (strchr (default_name, '.') == NULL)
strcpy (default_name + i, ".AUX");
} else strcpy (default_name, auxilary_name);
}/* get_default_name */
/*
* z_restore, restore [a part of] a Z-machine state from disk
*
* zargs[0] = address of area to restore (optional)
* zargs[1] = number of bytes to restore
* zargs[2] = address of suggested file name
*
*/
void z_restore (void)
{
char new_name[MAX_FILE_NAME + 1];
char default_name[MAX_FILE_NAME + 1];
FILE *gfp;
zword success = 0;
if (zargc != 0) {
/* Get the file name */
get_default_name (default_name, (zargc >= 3) ? zargs[2] : 0);
if (os_read_file_name (new_name, default_name, FILE_LOAD_AUX) == 0)
goto finished;
strcpy (auxilary_name, default_name);
/* Open auxilary file */
if ((gfp = fopen (new_name, "rb")) == NULL)
goto finished;
/* Load auxilary file */
success = fread (zmp + zargs[0], 1, zargs[1], gfp);
/* Close auxilary file */
fclose (gfp);
} else {
long pc;
zword release;
zword addr;
int i;
/* Get the file name */
if (os_read_file_name (new_name, save_name, FILE_RESTORE) == 0)
goto finished;
strcpy (save_name, new_name);
/* Open game file */
if ((gfp = fopen (new_name, "rb")) == NULL)
goto finished;
/* Load game file */
release = (unsigned) fgetc (gfp) << 8;
release |= fgetc (gfp);
(void) fgetc (gfp);
(void) fgetc (gfp);
/* Check the release number */
if (release == h_release) {
pc = (long) fgetc (gfp) << 16;
pc |= (unsigned) fgetc (gfp) << 8;
pc |= fgetc (gfp);
SET_PC (pc)
sp = stack + (fgetc (gfp) << 8);
sp += fgetc (gfp);
fp = stack + (fgetc (gfp) << 8);
fp += fgetc (gfp);
for (i = (int) (sp - stack); i < STACK_SIZE; i++) {
stack[i] = (unsigned) fgetc (gfp) << 8;
stack[i] |= fgetc (gfp);
}
fseek (story_fp, 0, SEEK_SET);
for (addr = 0; addr < h_dynamic_size; addr++) {
int skip = fgetc (gfp);
for (i = 0; i < skip; i++)
zmp[addr++] = fgetc (story_fp);
zmp[addr] = fgetc (gfp);
(void) fgetc (story_fp);
}
/* Check for errors */
if (ferror (gfp) || ferror (story_fp) || addr != h_dynamic_size)
os_fatal ("Error reading save file");
/* Reset upper window (V3 only) */
if (h_version == V3)
split_window (0);
/* Initialise story header */
restart_header ();
/* Success */
success = 2;
} else print_string ("Invalid save file\n");
/* Close game file */
fclose (gfp);
}
finished:
if (h_version <= V3)
branch (success);
else
store (success);
}/* z_restore */
/*
* restore_undo
*
* This function does the dirty work for z_restore_undo.
*
*/
int restore_undo (void)
{
if (undo_slots == 0) /* undo feature unavailable */
return -1;
else if (undo_valid == 0) /* no saved game state */
return 0;
else { /* undo possible */
long pc;
if (undo_count == 0)
undo_count = undo_slots;
memcpy (stack, undo[undo_count - 1], sizeof (stack));
memcpy (zmp, undo[undo_count - 1] + sizeof (stack), h_dynamic_size);
pc = ((long) stack[0] << 16) | stack[1];
sp = stack + stack[2];
fp = stack + stack[3];
SET_PC (pc)
restart_header ();
undo_count--;
undo_valid--;
return 2;
}
}/* restore_undo */
/*
* z_restore_undo, restore a Z-machine state from memory.
*
* no zargs used
*
*/
void z_restore_undo (void)
{
store ((zword) restore_undo ());
}/* restore_undo */
/*
* z_save, save [a part of] the Z-machine state to disk.
*
* zargs[0] = address of memory area to save (optional)
* zargs[1] = number of bytes to save
* zargs[2] = address of suggested file name
*
*/
void z_save (void)
{
char new_name[MAX_FILE_NAME + 1];
char default_name[MAX_FILE_NAME + 1];
FILE *gfp;
zword success = 0;
if (zargc != 0) {
/* Get the file name */
get_default_name (default_name, (zargc >= 3) ? zargs[2] : 0);
if (os_read_file_name (new_name, default_name, FILE_SAVE_AUX) == 0)
goto finished;
strcpy (auxilary_name, default_name);
/* Open auxilary file */
if ((gfp = fopen (new_name, "wb")) == NULL)
goto finished;
/* Write auxilary file */
success = fwrite (zmp + zargs[0], zargs[1], 1, gfp);
/* Close auxilary file */
fclose (gfp);
} else {
long pc;
zword addr;
zword nsp, nfp;
int skip;
int i;
/* Get the file name */
if (os_read_file_name (new_name, save_name, FILE_SAVE) == 0)
goto finished;
strcpy (save_name, new_name);
/* Open game file */
if ((gfp = fopen (new_name, "wb")) == NULL)
goto finished;
/* Write game file */
fputc ((int) hi (h_release), gfp);
fputc ((int) lo (h_release), gfp);
fputc ((int) hi (h_checksum), gfp);
fputc ((int) lo (h_checksum), gfp);
GET_PC (pc)
fputc ((int) (pc >> 16) & 0xff, gfp);
fputc ((int) (pc >> 8) & 0xff, gfp);
fputc ((int) (pc) & 0xff, gfp);
nsp = (int) (sp - stack);
nfp = (int) (fp - stack);
fputc ((int) hi (nsp), gfp);
fputc ((int) lo (nsp), gfp);
fputc ((int) hi (nfp), gfp);
fputc ((int) lo (nfp), gfp);
for (i = nsp; i < STACK_SIZE; i++) {
fputc ((int) hi (stack[i]), gfp);
fputc ((int) lo (stack[i]), gfp);
}
fseek (story_fp, 0, SEEK_SET);
for (addr = 0, skip = 0; addr < h_dynamic_size; addr++)
if (zmp[addr] != fgetc (story_fp) || skip == 255 || addr + 1 == h_dynamic_size) {
fputc (skip, gfp);
fputc (zmp[addr], gfp);
skip = 0;
} else skip++;
/* Close game file and check for errors */
if (fclose (gfp) == EOF || ferror (story_fp)) {
print_string ("Error writing save file\n");
goto finished;
}
/* Success */
success = 1;
}
finished:
if (h_version <= V3)
branch (success);
else
store (success);
}/* z_save */
/*
* save_undo
*
* This function does the dirty work for z_save_undo.
*
*/
int save_undo (void)
{
long pc;
if (undo_slots == 0) /* undo feature unavailable */
return -1;
else { /* save undo possible */
if (undo_count == undo_slots)
undo_count = 0;
GET_PC (pc)
stack[0] = (zword) (pc >> 16);
stack[1] = (zword) (pc & 0xffff);
stack[2] = (zword) (sp - stack);
stack[3] = (zword) (fp - stack);
memcpy (undo[undo_count], stack, sizeof (stack));
memcpy (undo[undo_count] + sizeof (stack), zmp, h_dynamic_size);
if (++undo_count == undo_slots)
undo_count = 0;
if (++undo_valid > undo_slots)
undo_valid = undo_slots;
return 1;
}
}/* save_undo */
/*
* z_save_undo, save the current Z-machine state for a future undo.
*
* no zargs used
*
*/
void z_save_undo (void)
{
store ((zword) save_undo ());
}/* z_save_undo */
/*
* z_verify, check the story file integrity.
*
* no zargs used
*
*/
void z_verify (void)
{
zword checksum = 0;
long i;
/* Sum all bytes in story file except header bytes */
fseek (story_fp, 64, SEEK_SET);
for (i = 64; i < story_size; i++)
checksum += fgetc (story_fp);
/* Branch if the checksums are equal */
branch (checksum == h_checksum);
}/* z_verify */
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