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quetzal.c
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quetzal.c
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/* $Id: quetzal.c,v 1.3 2000/07/05 15:20:34 jholder Exp $
* --------------------------------------------------------------------
* see doc/License.txt for License Information
* --------------------------------------------------------------------
*
* File name: $Id: quetzal.c,v 1.3 2000/07/05 15:20:34 jholder Exp $
*
* Description:
*
* Modification history:
* $Log: quetzal.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
*
*
* --------------------------------------------------------------------
*/
/* quetzal.c
*
* routines to handle QUETZAL save format
*/
#include <stdio.h>
#include "ztypes.h"
/* You may want to define these as getc and putc, but then the code gets
* quite big (especially for put_c).
*/
#define get_c getc
#define put_c fputc
/* Some systems appear to have this in funny places, rather than in <stdio.h>
* where it should be.
*/
#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif
#if defined(USE_QUETZAL) /* don't compile anything otherwise */
typedef unsigned long ul_t;
/* IDs of chunks we understand */
#define ID_FORM 0x464f524d
#define ID_IFZS 0x49465a53
#define ID_IFhd 0x49466864
#define ID_UMem 0x554d656d
#define ID_CMem 0x434d656d
#define ID_Stks 0x53746b73
#define ID_ANNO 0x414e4e4f
/* macros to write QUETZAL files */
#define write_byte(fp,b) (put_c ((unsigned)(b),fp) != EOF)
#define write_bytx(fp,b) write_byte(fp,(b) & 0xFF)
#define write_word(fp,w) \
(write_bytx(fp,(w)>> 8) && write_bytx(fp,(w)))
#define write_long(fp,l) \
(write_bytx(fp,(ul_t)(l)>>24) && write_bytx(fp,(ul_t)(l)>>16) && \
write_bytx(fp,(ul_t)(l)>> 8) && write_bytx(fp,(ul_t)(l)))
#define write_chnk(fp,id,len) \
(write_long(fp,id) && write_long(fp,len))
#define write_run(fp,run) \
(write_byte(fp,0) && write_byte(fp,(run)))
/* save_quetzal
*
* attempt to save game in QUETZAL format; return TRUE on success
*/
#ifdef USE_ZLIB
int save_quetzal( FILE * sfp, gzFile gfp )
#else
int save_quetzal( FILE * sfp, FILE * gfp )
#endif
{
ul_t ifzslen = 0, cmemlen = 0, stkslen = 0, tmp_pc;
int c;
zword_t i, j, n, init_fp, tmp_fp, nstk, nvars, args;
zword_t frames[STACK_SIZE / 4 + 1];
zbyte_t var;
long cmempos, stkspos;
/* write IFZS header */
if ( !write_chnk( sfp, ID_FORM, 0 ) )
return FALSE;
if ( !write_long( sfp, ID_IFZS ) )
return FALSE;
/* write IFhd chunk */
if ( !write_chnk( sfp, ID_IFhd, 13 ) )
return FALSE;
if ( !write_word( sfp, h_version ) )
return FALSE;
for ( i = 0; i < 6; ++i )
if ( !write_byte( sfp, get_byte( H_RELEASE_DATE + i ) ) )
return FALSE;
if ( !write_word( sfp, h_checksum ) )
return FALSE;
if ( !write_long( sfp, ( ( ul_t ) pc ) << 8 ) ) /* includes pad byte */
return FALSE;
/* write CMem chunk */
/* j is current run length */
if ( ( cmempos = ftell( sfp ) ) < 0 )
return FALSE;
if ( !write_chnk( sfp, ID_CMem, 0 ) )
return FALSE;
jz_rewind( gfp );
for ( i = 0, j = 0, cmemlen = 0; i < h_restart_size; ++i )
{
if ( ( c = jz_getc( gfp ) ) == EOF )
return FALSE;
c ^= get_byte( i );
if ( c == 0 )
++j;
else
{
/* write any run there may be */
if ( j > 0 )
{
for ( ; j > 0x100; j -= 0x100 )
{
if ( !write_run( sfp, 0xFF ) )
return FALSE;
cmemlen += 2;
}
if ( !write_run( sfp, j - 1 ) )
return FALSE;
cmemlen += 2;
j = 0;
}
/* write this byte */
if ( !write_byte( sfp, c ) )
return FALSE;
++cmemlen;
}
}
/* there may be a run here, which we ignore */
if ( cmemlen & 1 ) /* chunk length must be even */
if ( !write_byte( sfp, 0 ) )
return FALSE;
/* write Stks chunk */
if ( ( stkspos = ftell( sfp ) ) < 0 )
return FALSE;
if ( !write_chnk( sfp, ID_Stks, 0 ) )
return FALSE;
/* frames is a list of FPs, most recent first */
frames[0] = sp - 5; /* what FP would be if we did a call now */
for ( init_fp = fp, n = 0; init_fp <= STACK_SIZE - 5; init_fp = stack[init_fp + 2] )
frames[++n] = init_fp;
init_fp = frames[n] + 4;
if ( h_type != 6 )
{ /* write a dummy frame for stack used before first call */
for ( i = 0; i < 6; ++i )
if ( !write_byte( sfp, 0 ) )
return FALSE;
nstk = STACK_SIZE - 1 - init_fp;
if ( !write_word( sfp, nstk ) )
return FALSE;
for ( i = STACK_SIZE - 1; i > init_fp; --i )
if ( !write_word( sfp, stack[i] ) )
return FALSE;
stkslen = 8 + 2 * nstk;
}
for ( i = n; i > 0; --i )
{
/* write out one stack frame.
*
* tmp_fp : FP when this frame was current
* tmp_pc : PC on return from this frame, plus 000pvvvv
* nvars : number of local vars for this frame
* args : argument mask for this frame
* nstk : words of evaluation stack used for this frame
* var : variable to store result
*/
tmp_fp = frames[i];
nvars = ( stack[tmp_fp + 1] & VARS_MASK ) >> VAR_SHIFT;
args = stack[tmp_fp + 1] & ARGS_MASK;
nstk = tmp_fp - frames[i - 1] - nvars - 4;
tmp_pc = stack[tmp_fp + 3] + ( ul_t ) stack[tmp_fp + 4] * PAGE_SIZE;
switch ( stack[tmp_fp + 1] & TYPE_MASK )
{
case FUNCTION:
var = read_data_byte( &tmp_pc ); /* also increments tmp_pc */
tmp_pc = ( tmp_pc << 8 ) | nvars;
break;
case PROCEDURE:
var = 0;
tmp_pc = ( tmp_pc << 8 ) | 0x10 | nvars; /* set procedure flag */
break;
/* case ASYNC: */
default:
output_line( "Illegal Z-machine operation: can't save while in interrupt." );
return FALSE;
}
if ( args != 0 )
args = ( 1 << args ) - 1; /* make args into bitmap */
if ( !write_long( sfp, tmp_pc ) )
return FALSE;
if ( !write_byte( sfp, var ) )
return FALSE;
if ( !write_byte( sfp, args ) )
return FALSE;
if ( !write_word( sfp, nstk ) )
return FALSE;
for ( j = 0; j < nvars + nstk; ++j, --tmp_fp )
if ( !write_word( sfp, stack[tmp_fp] ) )
return FALSE;
stkslen += 8 + 2 * ( nvars + nstk );
}
/* fill in lengths for variable-sized chunks */
ifzslen = 3 * 8 + 4 + 14 + cmemlen + stkslen;
if ( cmemlen & 1 )
++ifzslen;
( void ) fseek( sfp, ( long ) 4, SEEK_SET );
if ( !write_long( sfp, ifzslen ) )
return FALSE;
( void ) fseek( sfp, cmempos + 4, SEEK_SET );
if ( !write_long( sfp, cmemlen ) )
return FALSE;
( void ) fseek( sfp, stkspos + 4, SEEK_SET );
if ( !write_long( sfp, stkslen ) )
return FALSE;
return TRUE;
}
/* end save_quetzal */
/* read_word
*
* attempt to read a word; return TRUE on success
*/
static int read_word( FILE * fp, zword_t * result )
{
int a, b;
if ( ( a = get_c( fp ) ) == EOF )
return FALSE;
if ( ( b = get_c( fp ) ) == EOF )
return FALSE;
*result = ( ( zword_t ) a << 8 ) | b;
return TRUE;
}
/* read_long
*
* attempt to read a longword; return TRUE on success
*/
static int read_long( FILE * fp, ul_t * result )
{
int a, b, c, d;
if ( ( a = get_c( fp ) ) == EOF )
return FALSE;
if ( ( b = get_c( fp ) ) == EOF )
return FALSE;
if ( ( c = get_c( fp ) ) == EOF )
return FALSE;
if ( ( d = get_c( fp ) ) == EOF )
return FALSE;
*result = ( ( ul_t ) a << 24 ) | ( ( ul_t ) b << 16 ) | ( ( ul_t ) c << 8 ) | d;
#ifdef QDEBUG
printf( "%c%c%c%c", a, b, c, d );
#endif
return TRUE;
}
/* restore_quetzal
*
* attempt to restore game in QUETZAL format; return TRUE on success
*/
#define GOT_HEADER 0x01
#define GOT_STACK 0x02
#define GOT_MEMORY 0x04
#define GOT_NONE 0x00
#define GOT_ALL 0x07
#define GOT_ERROR 0x80
#ifdef USE_ZLIB
int restore_quetzal( FILE * sfp, gzFile gfp )
#else
int restore_quetzal( FILE * sfp, FILE * gfp )
#endif
{
ul_t ifzslen, currlen, tmpl, skip = 0;
zword_t i, tmpw;
zbyte_t progress = GOT_NONE;
int x, y;
/* check for IFZS file */
if ( !read_long( sfp, &tmpl ) || !read_long( sfp, &ifzslen ) )
return FALSE;
if ( !read_long( sfp, &currlen ) )
return FALSE;
if ( tmpl != ID_FORM || currlen != ID_IFZS )
{
output_line( "This is not a saved game file!" );
return FALSE;
}
if ( ( ifzslen & 1 ) || ifzslen < 4 )
return FALSE;
ifzslen -= 4;
/* read a chunk and process it */
while ( ifzslen > 0 )
{
/* read chunk header */
if ( ifzslen < 8 )
return FALSE;
if ( !read_long( sfp, &tmpl ) || !read_long( sfp, &currlen ) )
return FALSE;
ifzslen -= 8;
/* body of chunk */
if ( ifzslen < currlen )
return FALSE;
skip = currlen & 1;
ifzslen -= currlen + skip;
switch ( tmpl )
{
case ID_IFhd:
if ( progress & GOT_HEADER )
{
output_line( "Save file has two IFhd chunks!" );
return FALSE;
}
progress |= GOT_HEADER;
if ( currlen < 13 || !read_word( sfp, &i ) )
return FALSE;
if ( i != h_version )
progress = GOT_ERROR;
for ( i = H_RELEASE_DATE; i < H_RELEASE_DATE + 6; ++i )
{
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
if ( x != ( int ) get_byte( i ) )
progress = GOT_ERROR;
}
if ( !read_word( sfp, &i ) )
return FALSE;
if ( i != h_checksum )
progress = GOT_ERROR;
if ( progress == GOT_ERROR )
{
output_line( "File was not saved from this story!" );
return FALSE;
}
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
pc = ( ul_t ) x << 16;
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
pc |= ( ul_t ) x << 8;
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
pc |= ( ul_t ) x;
for ( i = 13; ( ul_t ) i < currlen; ++i )
( void ) get_c( sfp ); /* skip rest of chunk */
break;
case ID_Stks:
if ( progress & GOT_STACK )
{
output_line( "File contains two stack chunks!" );
break;
}
progress |= GOT_STACK;
sp = STACK_SIZE;
if ( h_type != 6 )
{
/* dummy stack frame for stack used before call */
if ( currlen < 8 )
return FALSE;
for ( i = 0; i < 6; ++i )
if ( get_c( sfp ) != 0 )
return FALSE;
if ( !read_word( sfp, &tmpw ) )
return FALSE;
currlen -= 8;
if ( currlen < (unsigned long)(tmpw * 2) )
return FALSE;
for ( i = 0; i < tmpw; ++i )
if ( !read_word( sfp, stack + ( --sp ) ) )
return FALSE;
currlen -= tmpw * 2;
}
for ( fp = STACK_SIZE - 1, frame_count = 0; currlen > 0; currlen -= 8 )
{
if ( currlen < 8 )
return FALSE;
if ( sp < 4 )
{
output_line( "error: this save-file has too much stack, and I can't cope." );
return FALSE;
}
/* read PC, procedure flag, and arg count */
if ( !read_long( sfp, &tmpl ) )
return FALSE;
y = ( zword_t ) tmpl & 0x0F;
tmpw = y << VAR_SHIFT; /* number of variables */
/* read result variable */
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
if ( tmpl & 0x10 )
{
tmpw |= PROCEDURE;
tmpl >>= 8;
}
else
{
tmpw |= FUNCTION;
tmpl >>= 8;
--tmpl;
/* sanity check on result variable */
if ( read_data_byte( &tmpl ) != ( zbyte_t ) x )
{
output_line( "error: wrong variable number on stack (wrong story file?)." );
return FALSE;
}
--tmpl; /* read_data_byte increments it */
}
stack[--sp] = ( zword_t ) ( tmpl / PAGE_SIZE );
stack[--sp] = ( zword_t ) ( tmpl % PAGE_SIZE );
stack[--sp] = fp;
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
++x; /* hopefully x now contains a single set bit */
for ( i = 0; i < 8; ++i )
if ( x & ( 1 << i ) )
break;
if ( x ^ ( 1 << i ) ) /* if more than 1 bit set */
{
output_line
( "error: this game uses incomplete argument lists (which I can't handle)." );
return FALSE;
}
tmpw |= i;
stack[--sp] = tmpw;
fp = sp - 1; /* FP for next frame */
if ( !read_word( sfp, &tmpw ) )
return FALSE;
tmpw += y; /* local vars plus eval stack used */
if ( tmpw >= sp )
{
output_line( "error: this save-file uses more stack than I can cope with." );
return FALSE;
}
if ( currlen < (unsigned long)(tmpw * 2) )
return FALSE;
for ( i = 0; i < tmpw; ++i )
if ( !read_word( sfp, stack + ( --sp ) ) )
return FALSE;
currlen -= tmpw * 2;
}
break;
case ID_ANNO:
z_buffer_mode( ON );
for ( ; currlen > 0; --currlen )
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
else
write_char( x );
write_char( ( char ) 13 );
break;
case ID_CMem:
if ( !( progress & GOT_MEMORY ) )
{
jz_rewind( gfp );
i = 0; /* bytes written to data area */
for ( ; currlen > 0; --currlen )
{
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
if ( x == 0 ) /* start run */
{
if ( currlen < 2 )
{
output_line( "File contains bogus CMem chunk" );
for ( ; currlen > 0; --currlen )
( void ) get_c( sfp ); /* skip rest */
currlen = 1;
i = 0xFFFF;
break; /* keep going in case there's a UMem */
}
--currlen;
if ( ( x = get_c( sfp ) ) == EOF )
return FALSE;
for ( ; x >= 0 && i < h_restart_size; --x, ++i )
if ( ( y = jz_getc( gfp ) ) == EOF )
return FALSE;
else
set_byte( i, y );
}
else /* not a run */
{
if ( ( y = jz_getc( gfp ) ) == EOF )
return FALSE;
set_byte( i, x ^ y );
++i;
}
if ( i > h_restart_size )
{
output_line( "warning: CMem chunk too long!" );
for ( ; currlen > 1; --currlen )
( void ) get_c( sfp ); /* skip rest */
break; /* keep going in case there's a UMem */
}
}
/* if chunk is short, assume a run */
for ( ; i < h_restart_size; ++i )
if ( ( y = jz_getc( gfp ) ) == EOF )
return FALSE;
else
set_byte( i, y );
if ( currlen == 0 )
progress |= GOT_MEMORY; /* only if succeeded */
break;
}
/* Fall thru (to default) if already got memory */
case ID_UMem:
if ( !( progress & GOT_MEMORY ) )
{
if ( currlen == h_restart_size )
{
if ( fread( datap, h_restart_size, 1, sfp ) == 1 )
{
progress |= GOT_MEMORY; /* only if succeeded */
break;
}
}
else
output_line( "warning: UMem chunk wrong size!" );
/* and fall thru into default */
}
/* Fall thru (to default) if already got memory */
default:
( void ) fseek( sfp, currlen, SEEK_CUR ); /* skip chunk */
break;
}
if ( skip )
( void ) get_c( sfp ); /* skip pad byte */
}
if ( !( progress & GOT_HEADER ) )
output_line( "error: no header chunk in file." );
if ( !( progress & GOT_STACK ) )
output_line( "error: no stack chunk in file." );
if ( !( progress & GOT_MEMORY ) )
output_line( "error: no memory chunk in file." );
return ( progress == GOT_ALL );
}
#endif /* defined(USE_QUETZAL) */