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fileio.c
1497 lines (1265 loc) · 33.3 KB
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fileio.c
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/* $Id: fileio.c,v 1.3 2000/07/05 15:20:34 jholder Exp $
* --------------------------------------------------------------------
* see doc/License.txt for License Information
* --------------------------------------------------------------------
*
* File name: $Id: fileio.c,v 1.3 2000/07/05 15:20:34 jholder Exp $
*
* Description:
*
* Modification history:
* $Log: fileio.c,v $
* Revision 1.3 2000/07/05 15:20:34 jholder
* Updated code to remove warnings.
*
* Revision 1.2 2000/05/25 22:28:56 jholder
* changes routine names to reflect zmachine opcode names per spec 1.0
*
* Revision 1.1.1.1 2000/05/10 14:21:34 jholder
*
* imported
*
*
* --------------------------------------------------------------------
*/
/*
* fileio.c
*
* File manipulation routines. Should be generic.
*
*/
#include "ztypes.h"
#include "jzexe.h" /* mol 951115 */
/* Static data */
extern int GLOBALVER;
#ifdef USE_ZLIB
static gzFile gfp = NULL; /* Zcode file pointer */
#else
static FILE *gfp = NULL; /* Zcode file pointer */
#endif
static FILE *sfp = NULL; /* Script file pointer */
static FILE *rfp = NULL; /* Record file pointer */
#if defined BUFFER_FILES
#ifndef USE_ZLIB
static char gfpbuffer[BUFSIZ];
#endif
static char sfpbuffer[BUFSIZ];
static char rfpbuffer[BUFSIZ];
#endif
char save_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1] = "story.sav";
char script_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1] = "story.scr";
char record_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1] = "story.rec";
char auxilary_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1] = "story.aux";
static int undo_valid = 0;
static int script_file_valid = FALSE;
static long story_offset = 0; /* mol 951114 */
char *magic = ( char * ) MAGIC_STRING; /* mol */
static int save_restore( const char *, int );
/*
* analyze_exefile
*
* This function is called if the game file seems to be a JZEXE file
* (standalone game file). If that is the case, story_offset is set
* to the beginning of the Z code and the function returns TRUE,
* otherwise no action is taken and it returns FALSE.
*
* Magnus Olsson, November 1995
*/
int analyze_exefile( void )
{
int c, i;
if ( story_offset > 0 )
{
/* This is wrong; we shouldn't be doing this. */
return FALSE;
}
/* Look for the magic string, starting from the beginning. */
jz_rewind( gfp );
i = 0;
while ( ( c = jz_getc( gfp ) ) > -1 )
{
if ( c != magic[i] )
{
if ( c == magic[0] )
{
i = 1; /* Next character should match magic[1] */
}
else
{
i = 0;
}
}
else if ( ++i == MAGIC_END )
{
/* Found the magic string! The next byte must be zero. */
if ( jz_getc( gfp ) != 0 )
{
return FALSE;
}
/* Read offset and return. We won't concern ourselves with possible
* read errors, since their consequences will be detected later on,
* when we try to interpret the file as Z code. */
story_offset = jz_getc( gfp );
story_offset += 256L * jz_getc( gfp );
story_offset += 65536L * jz_getc( gfp );
return TRUE;
}
}
/* If we get here, we've reached the end of the infile without success. */
return FALSE;
} /* analyze_exefile */
/*
* check_blorb
*
* This function checks if the game looks like a blorb file and finds
* the first (supposedly only) ZCOD IFF chunk.
*
*/
int check_blorb( void )
{
int c, i, n, offset;
char s[4];
jz_seek( gfp, story_offset, SEEK_SET );
/* Look for the blorb IFF header. */
for ( i = 0; i < 4; i++)
{
c = jz_getc( gfp );
if ( c == EOF )
return FALSE;
s[i] = c;
}
if ( strncmp( s, "FORM", 4 ) )
return FALSE;
jz_seek( gfp, story_offset + 8, SEEK_SET );
for ( i = 0; i < 4; i++)
{
c = jz_getc( gfp );
if ( c == EOF )
return FALSE;
s[i] = c;
}
if ( strncmp( s, "IFRS", 4 ) )
return FALSE;
offset = 12;
while ( !jz_seek( gfp, story_offset + offset, SEEK_SET ) )
{
/* Read chunk header. */
for ( i = 0; i < 4; i++)
{
c = jz_getc( gfp );
if ( c == EOF )
return FALSE;
s[i] = c;
}
n = 0;
for ( i = 0; i < 4; i++)
{
c = jz_getc( gfp );
if ( c == EOF )
return FALSE;
n = n * 256 + c;
}
offset += 8;
/* Search for ZCOD. */
if ( !strncmp( s, "ZCOD", 4 ) )
{
story_offset += offset;
return TRUE;
}
/* Ensure that progress is made. */
if ( n < 0 )
break;
offset += n;
}
/* Either no ZCOD in file or read a negative chunk size (error). */
return FALSE;
} /* check_blorb */
/*
* set_names
*
* Set up the story names intelligently.
* John Holder, 28 Sept 1995
*/
void set_names( const char *storyname )
{
char *per_pos = 0;
strcpy( save_name, storyname );
strcpy( script_name, storyname );
strcpy( record_name, storyname );
strcpy( auxilary_name, storyname );
/* experimental setting of save_name, added by John Holder 26 July 1995 */
per_pos = strrchr( storyname, '.' ); /* find last '.' in storyname. */
if ( per_pos ) /* The story file looks like "Odius.dat" or "odieus.z3" */
{
per_pos = strrchr( save_name, '.' );
*( per_pos ) = '\0';
strcat( save_name, ".sav" );
per_pos = strrchr( script_name, '.' );
*( per_pos ) = '\0';
strcat( script_name, ".scr" );
per_pos = strrchr( record_name, '.' );
*( per_pos ) = '\0';
strcat( record_name, ".rec" );
per_pos = strrchr( auxilary_name, '.' );
*( per_pos ) = '\0';
strcat( auxilary_name, ".aux" );
}
else /* The story file looks like: "OdieusQuest" */
{
strcat( save_name, ".sav" );
strcat( script_name, ".src" );
strcat( record_name, ".rec" );
strcat( auxilary_name, ".aux" );
}
} /* set_names */
/*
* open_story
*
* Open game file for read.
*
*/
void open_story( const char *storyname )
{
char *path, *p;
char tmp[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1];
path = p = 0;
if ( !STANDALONE_FLAG )
{
story_offset = 0;
}
else
{
/* standalone game; offset to story start is saved in low-endian */
/* format after magic string */
story_offset =
(unsigned char) magic[MAGIC_END + 1] +
(unsigned char) magic[MAGIC_END + 2] * 256L +
(unsigned char) magic[MAGIC_END + 3] * 65536L;
}
strcpy( tmp, storyname );
if ( ( gfp = jz_open( tmp, "rb" ) ) != NULL )
{
#if defined BUFFER_FILES
#ifndef USE_ZLIB
setbuf( gfp, gfpbuffer );
#endif
#endif
set_names( storyname );
return;
#if defined MSDOS || defined OS2
}
else
{
sprintf( tmp, "%s.exe", storyname );
if ( ( gfp = jz_open( tmp, "rb" ) ) != NULL )
{
#if defined BUFFER_FILES
#ifndef USE_ZLIB
setbuf( gfp, gfpbuffer );
#endif
#endif
set_names( storyname );
return;
}
#endif
}
if ( !STANDALONE_FLAG && ( path = getenv( "INFOCOM_PATH" ) ) == NULL )
{
fprintf( stderr, "%s ", tmp );
fatal( "open_story(): Zcode file not found" );
}
else if ( STANDALONE_FLAG && ( path = getenv( "PATH" ) ) == NULL )
{
fprintf( stderr, "%s ", tmp );
fatal( "open_story(): Zcode file not found" );
}
/* dos path will be like: */
/* SET INFOCOM_PATH = C:\INFOCOM\LTOI1;C:\INFOCOM\LTOI2;C:\INFOCOM\INFORM */
#if defined MSDOS || defined OS2
p = strtok( path, ";" );
#else
/* UNIX path will be like: */
/* setenv INFOCOM_PATH /usr/local/lib/ltoi1:/usr/local/lib/ltoi2 */
p = strtok( path, ":" );
#endif
while ( p )
{
sprintf( tmp, "%s/%s", p, storyname );
if ( ( gfp = jz_open( tmp, "rb" ) ) != NULL )
{
#if defined BUFFER_FILES
#ifndef USE_ZLIB
setbuf( gfp, gfpbuffer );
#endif
#endif
set_names( storyname );
return;
#if defined MSDOS || defined OS2
}
else
{
sprintf( tmp, "%s/%s.exe", p, storyname );
if ( ( gfp = jz_open( tmp, "rb" ) ) != NULL )
{
#if defined BUFFER_FILES
#ifndef USE_ZLIB
setbuf( gfp, gfpbuffer );
#endif
#endif
set_names( storyname );
return;
}
#endif
}
#if defined MSDOS || defined OS2
p = strtok( NULL, ";" );
#else
p = strtok( NULL, ":" );
#endif
}
fprintf( stderr, "%s ", tmp );
fatal( "open_story(): Zcode file not found" );
} /* open_story */
/*
* close_story
*
* Close game file if open.
*
*/
void close_story( void )
{
if ( gfp != NULL )
{
jz_close( gfp );
}
} /* close_story */
/*
* get_story_size
*
* Calculate the size of the game file. Only used for very old games that do not
* have the game file size in the header.
*
*/
unsigned int get_story_size( void )
{
unsigned long file_length;
/* Read whole file to calculate file size */
jz_rewind( gfp );
for ( file_length = 0; jz_getc( gfp ) != EOF; file_length++ )
;
jz_rewind( gfp );
/* Calculate length of file in game allocation units */
file_length =
( file_length + ( unsigned long ) ( story_scaler - 1 ) ) / ( unsigned long ) story_scaler;
return ( ( unsigned int ) file_length );
} /* get_story_size */
/*
* read_page
*
* Read one game file page.
*
*/
void read_page( int page, void *buffer )
{
unsigned long file_size;
unsigned int pages, offset;
/* Seek to start of page */
jz_seek( gfp, story_offset + ( long ) page * PAGE_SIZE, SEEK_SET );
/* Read the page */
#ifdef USE_ZLIB
if ( gzread( gfp, buffer, PAGE_SIZE ) == -1 )
#else
if ( fread( buffer, PAGE_SIZE, 1, gfp ) != 1 )
#endif
{
/* Read failed. Are we in the last page? */
file_size = ( unsigned long ) h_file_size *story_scaler;
pages = ( unsigned int ) ( ( unsigned long ) file_size / PAGE_SIZE );
offset = ( unsigned int ) ( ( unsigned long ) file_size & PAGE_MASK );
if ( ( unsigned int ) page == pages )
{
/* Read partial page if this is the last page in the game file */
jz_seek( gfp, story_offset + ( long ) page * PAGE_SIZE, SEEK_SET );
#ifdef USE_ZLIB
if ( gzread( gfp, buffer, offset ) == -1 )
#else
if ( fread( buffer, offset, 1, gfp ) != 1 )
#endif
{
fatal( "read_page(): Zcode file read error" );
}
}
}
} /* read_page */
/*
* z_verify
*
* Verify game ($verify verb). Add all bytes in game file except for bytes in
* the game file header.
*
*/
void z_verify( void )
{
unsigned long file_size;
unsigned int pages, offset;
unsigned int start, end, i, j;
zword_t checksum = 0;
zbyte_t buffer[PAGE_SIZE] = { 0 };
char szBuffer[6] = { 0 };
/* Print version banner */
z_new_line( );
write_string( "Running on " );
write_string( JZIPVER );
write_string( " (" );
switch ( JTERP )
{
case INTERP_GENERIC:
write_string( "Generic" );
break;
case INTERP_AMIGA:
write_string( "Amiga" );
break;
case INTERP_ATARI_ST:
write_string( "Atari ST" );
break;
case INTERP_MSDOS:
write_string( "DOS" );
break;
case INTERP_UNIX:
write_string( "UNIX" );
break;
case INTERP_VMS:
write_string( "VMS" );
break;
}
write_string( "). Reporting Spec " );
sprintf( szBuffer, "%d.%d", get_byte( H_STANDARD_HIGH ), get_byte( H_STANDARD_LOW ) );
write_string( szBuffer );
write_string( " Compliance." );
z_new_line( );
write_string( "Compile options: " );
#ifdef USE_QUETZAL
write_string( "USE_QUETZAL " );
#endif
#ifdef STRICTZ
write_string( "STRICTZ " );
#endif
#ifdef USE_ZLIB
write_string( "USE_ZLIB " );
#endif
#ifdef LOUSY_RANDOM
write_string( "LOUSY_RANDOM " );
#endif
#ifdef HARD_COLORS
write_string( "HARD_COLORS " );
#endif
z_new_line( );
write_string( "Release " );
write_string( JZIPRELDATE );
write_string( "." );
z_new_line( );
write_string( "Playing a Version " );
z_print_num( (zword_t) GLOBALVER );
write_string( " Story." );
z_new_line( );
z_new_line( );
/* Calculate game file dimensions */
file_size = ( unsigned long ) h_file_size *story_scaler;
pages = ( unsigned int ) ( ( unsigned long ) file_size / PAGE_SIZE );
offset = ( unsigned int ) file_size & PAGE_MASK;
/* Sum all bytes in game file, except header bytes */
for ( i = 0; i <= pages; i++ )
{
read_page( i, buffer );
start = ( i == 0 ) ? 64 : 0;
end = ( i == pages ) ? offset : PAGE_SIZE;
for ( j = start; j < end; j++ )
{
checksum += buffer[j];
}
}
/* Make a conditional jump based on whether the checksum is equal */
conditional_jump( checksum == h_checksum );
} /* z_verify */
/*
* get_default_name
*
* Read a default file name from the memory of the Z-machine and
* copy it to an array.
*
*/
static void get_default_name( char *default_name, zword_t addr )
{
zbyte_t len;
zbyte_t c;
unsigned int i;
if ( addr != 0 )
{
len = get_byte( addr );
for ( i = 0; i < len; i++ )
{
addr++;
c = get_byte( addr );
default_name[i] = c;
}
default_name[i] = 0;
if ( strchr( default_name, '.' ) == 0 )
{
strcpy( default_name + i, ".aux" );
}
}
else
{
strcpy( default_name, auxilary_name );
}
} /* get_default_name */
/*
* z_save
*
* Saves data to disk. Returns:
* 0 = save failed
* 1 = save succeeded
*
*/
int z_save( int argc, zword_t table, zword_t bytes, zword_t name )
{
char new_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1];
char default_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1];
FILE *afp;
#if defined BUFFER_FILES
char afpbuffer[BUFSIZ];
#endif
int status = 0;
if ( argc == 3 )
{
get_default_name( default_name, name );
if ( get_file_name( new_name, default_name, GAME_SAVE_AUX ) != 0 )
{
goto finished;
}
if ( ( afp = fopen( new_name, "wb" ) ) == NULL )
{
goto finished;
}
#if defined BUFFER_FILES
setbuf( afp, afpbuffer );
#endif
status = fwrite( datap + table, bytes, 1, afp );
fclose( afp );
if ( status != 0 )
{
strcpy( auxilary_name, default_name );
}
status = !status;
}
else
{
/* Get the file name */
status = 1;
if ( get_file_name( new_name, save_name, GAME_SAVE ) == 0 )
{
/* Do a save operation */
if ( save_restore( new_name, GAME_SAVE ) == 0 )
{
/* Cleanup file */
file_cleanup( new_name, GAME_SAVE );
/* Save the new name as the default file name */
strcpy( save_name, new_name );
/* Indicate success */
status = 0;
}
}
}
finished:
/* Return result of save to Z-code */
if ( h_type < V4 )
{
conditional_jump( status == 0 );
}
else
{
store_operand( (zword_t)(( status == 0 ) ? 1 : 0) );
}
return ( status );
} /* z_save */
/*
* z_restore
*
* Restore game state from disk. Returns:
* 0 = restore failed
* 2 = restore succeeded
*/
int z_restore( int argc, zword_t table, zword_t bytes, zword_t name )
{
char new_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1];
char default_name[Z_FILENAME_MAX + Z_PATHNAME_MAX + 1];
FILE *afp;
#if defined BUFFER_FILES
char afpbuffer[BUFSIZ];
#endif
int status;
status = 0;
if ( argc == 3 )
{
get_default_name( default_name, name );
if ( get_file_name( new_name, default_name, GAME_LOAD_AUX ) != 0 )
{
goto finished;
}
if ( ( afp = fopen( new_name, "rb" ) ) == NULL )
{
goto finished;
}
#if defined BUFFER_FILES
setbuf( afp, afpbuffer );
#endif
status = fread( datap + table, bytes, 1, afp );
fclose( afp );
if ( status != 0 )
{
strcpy( auxilary_name, default_name );
store_operand( (zword_t) bytes );
return ( 0 );
}
status = !status;
}
else
{
/* Get the file name */
status = 1;
if ( get_file_name( new_name, save_name, GAME_RESTORE ) == 0 )
{
/* Do the restore operation */
if ( save_restore( new_name, GAME_RESTORE ) == 0 )
{
/* Reset the status region (this is just for Seastalker) */
if ( h_type < V4 )
{
z_split_window( 0 );
blank_status_line( );
}
/* Cleanup file */
file_cleanup( new_name, GAME_SAVE );
/* Save the new name as the default file name */
strcpy( save_name, new_name );
/* Indicate success */
status = 0;
}
}
}
finished:
/* Return result of save to Z-code */
if ( h_type < V4 )
{
conditional_jump( status == 0 );
}
else
{
store_operand( (zword_t)(( status == 0 ) ? 2 : 0) );
}
return ( status );
} /* z_restore */
/*
* z_save_undo
*
* Save the current Z machine state in memory for a future undo. Returns:
* -1 = feature unavailable
* 0 = save failed
* 1 = save succeeded
*
*/
void z_save_undo( void )
{
/* Check if undo is available first */
if ( undo_datap != NULL )
{
/* Save the undo data and return success */
save_restore( NULL, UNDO_SAVE );
store_operand( 1 );
}
else
{
/* If no memory for data area then say undo is not available */
store_operand( ( zword_t ) - 1 );
}
} /* z_save_undo */
/*
* z_restore_undo
*
* Restore the current Z machine state from memory. Returns:
* -1 = feature unavailable
* 0 = restore failed
* 2 = restore succeeded
*
*/
void z_restore_undo( void )
{
/* Check if undo is available first */
if ( undo_datap != NULL )
{
/* If no undo save done then return an error */
if ( undo_valid > 0 )
{
/* Restore the undo data and return success */
save_restore( NULL, UNDO_RESTORE );
store_operand( 2 );
}
else
{
store_operand( 0 );
}
}
else
{
/* If no memory for data area then say undo is not available */
store_operand( ( zword_t ) - 1 );
}
} /* z_restore_undo */
/*
* swap_bytes
*
* Swap the low and high bytes in every word of the specified array.
* The length is specified in BYTES!
*
* This routine added by Mark Phillips(msp@bnr.co.uk), Thanks Mark!
*/
#if !defined(USE_QUETZAL)
void swap_bytes( zword_t * ptr, int len )
{
unsigned char *pbyte;
unsigned char tmp;
len /= 2; /* convert len into number of 2 byte words */
pbyte = ( unsigned char * ) ptr;
while ( len )
{
tmp = pbyte[0];
pbyte[0] = pbyte[1];
pbyte[1] = tmp;
pbyte += 2;
len--;
}
return;
}
#endif
/*
* save_restore
*
* Common save and restore code. Just save or restore the game stack and the
* writeable data area.
*
*/
static int save_restore( const char *file_name, int flag )
{
FILE *tfp = NULL;
#if defined BUFFER_FILES
char tfpbuffer[BUFSIZ];
#endif
int scripting_flag = 0, status = 0;
#if !defined(USE_QUETZAL)
zword_t zw;
int little_endian = 0;
/* Find out if we are big-endian */
zw = 0x0001;
if ( *( zbyte_t * ) & zw )
{ /* We are little-endian, like an Intel 80x86 chip. */
little_endian = 1;
}
#endif
if ( flag == UNDO_SAVE && undo_valid == undo_size )
{
zbyte_t * tmp;
--undo_valid;
tmp = undo_stack[0];
memmove( undo_stack, undo_stack + 1, undo_valid * sizeof ( zbyte_t * ) );
undo_stack[undo_valid] = tmp;
tmp = undo_datap[0];
memmove( undo_datap, undo_datap + 1, undo_valid * sizeof ( zbyte_t * ) );
undo_datap[undo_valid] = tmp;
}
/* Open the save file and disable scripting */
if ( flag == GAME_SAVE || flag == GAME_RESTORE )
{
if ( ( tfp = fopen( file_name, ( flag == GAME_SAVE ) ? "wb" : "rb" ) ) == NULL )
{
output_line( "Cannot open SAVE file" );
return ( 1 );
}
#if defined BUFFER_FILES
setbuf( tfp, tfpbuffer );
#endif
scripting_flag = get_word( H_FLAGS ) & SCRIPTING_FLAG;
set_word( H_FLAGS, get_word( H_FLAGS ) & ( ~SCRIPTING_FLAG ) );
}
#if defined(USE_QUETZAL)
if ( flag == GAME_SAVE )
{
status = !save_quetzal( tfp, gfp );
}
else if ( flag == GAME_RESTORE )
{
status = !restore_quetzal( tfp, gfp );
}
else
{
#endif /* defined(USE_QUETZAL) */
/* Push PC, FP, version and store SP in special location */
stack[--sp] = ( zword_t ) ( pc / PAGE_SIZE );
stack[--sp] = ( zword_t ) ( pc % PAGE_SIZE );
stack[--sp] = fp;
stack[--sp] = h_version;
stack[0] = sp;
/* Save or restore stack */
#if !defined(USE_QUETZAL)
if ( flag == GAME_SAVE )
{
if ( little_endian )
swap_bytes( stack, sizeof ( stack ) );
if ( status == 0 && fwrite( stack, sizeof ( stack ), 1, tfp ) != 1 )
status = 1;
if ( little_endian )
swap_bytes( stack, sizeof ( stack ) );
}
else if ( flag == GAME_RESTORE )
{
if ( little_endian )
swap_bytes( stack, sizeof ( stack ) );
if ( status == 0 && fread( stack, sizeof ( stack ), 1, tfp ) != 1 )
status = 1;
if ( little_endian )
swap_bytes( stack, sizeof ( stack ) );
}
else
#endif /* !defined(USE_QUETZAL) */
{
if ( flag == UNDO_SAVE )
{
memmove( undo_stack[undo_valid], stack, sizeof ( stack ) );
}
else /* if (flag == UNDO_RESTORE) */
{
--undo_valid;
memmove( stack, undo_stack[undo_valid], sizeof ( stack ) );
}
}
/* Restore SP, check version, restore FP and PC */
sp = stack[0];
if ( stack[sp++] != h_version )
{
fatal( "save_restore(): Wrong game or version" );
}
fp = stack[sp++];
pc = stack[sp++];
pc += ( unsigned long ) stack[sp++] * PAGE_SIZE;
/* Save or restore writeable game data area */