1 /* slt.c: SLT data handling routines
2 Copyright (c) 2004-2016 Philip Kendall
3 Copyright (c) 2015 Stuart Brady
4 Copyright (c) 2015 Fredrick Meunier
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19
20 Author contact information:
21
22 E-mail: philip-fuse@shadowmagic.org.uk
23
24 */
25
26 #include <config.h>
27
28 #include <string.h>
29
30 #include <libspectrum.h>
31
32 #include "infrastructure/startup_manager.h"
33 #include "module.h"
34 #include "settings.h"
35 #include "slt.h"
36 #include "spectrum.h"
37 #include "ui/ui.h"
38
39 /* .slt level data */
40
41 static libspectrum_byte *slt[256];
42 static size_t slt_length[256];
43
44 static libspectrum_byte *slt_screen; /* The screenshot from the .slt file */
45 static int slt_screen_level; /* The level of the screenshot.
46 Not used for anything AFAIK */
47
48 static void slt_from_snapshot( libspectrum_snap *snap );
49 static void slt_to_snapshot( libspectrum_snap *snap );
50
51 static module_info_t slt_module_info = {
52
53 NULL,
54 NULL,
55 NULL,
56 slt_from_snapshot,
57 slt_to_snapshot,
58
59 };
60
61 static int
slt_init(void * context)62 slt_init( void *context )
63 {
64 module_register( &slt_module_info );
65
66 return 0;
67 }
68
69 void
slt_register_startup(void)70 slt_register_startup( void )
71 {
72 startup_manager_module dependencies[] = { STARTUP_MANAGER_MODULE_SETUID };
73 startup_manager_register( STARTUP_MANAGER_MODULE_SLT, dependencies,
74 ARRAY_SIZE( dependencies ), slt_init, NULL, NULL );
75 }
76
77 int
slt_trap(libspectrum_word address,libspectrum_byte level)78 slt_trap( libspectrum_word address, libspectrum_byte level )
79 {
80 size_t length;
81 libspectrum_byte *data;
82
83 if( !settings_current.slt_traps ) return 0;
84
85 if( slt_length[ level ] ) {
86
87 length = slt_length[ level ];
88 data = slt[ level ];
89
90 while( length-- ) writebyte( address++, *data++ );
91
92 }
93
94 return 0;
95 }
96
97 static void
slt_from_snapshot(libspectrum_snap * snap)98 slt_from_snapshot( libspectrum_snap *snap )
99 {
100 size_t i;
101
102 for( i=0; i<256; i++ ) {
103
104 slt_length[i] = libspectrum_snap_slt_length( snap, i );
105
106 if( slt_length[i] ) {
107
108 slt[i] = memory_pool_allocate( slt_length[i] *
109 sizeof( libspectrum_byte ) );
110
111 memcpy( slt[i], libspectrum_snap_slt( snap, i ),
112 libspectrum_snap_slt_length( snap, i ) );
113 }
114 }
115
116 if( libspectrum_snap_slt_screen( snap ) ) {
117
118 slt_screen = memory_pool_allocate( 6912 * sizeof( libspectrum_byte ) );
119
120 memcpy( slt_screen, libspectrum_snap_slt_screen( snap ), 6912 );
121 slt_screen_level = libspectrum_snap_slt_screen_level( snap );
122 }
123 }
124
125 static void
slt_to_snapshot(libspectrum_snap * snap)126 slt_to_snapshot( libspectrum_snap *snap )
127 {
128 size_t i;
129 libspectrum_byte *buffer;
130
131 for( i=0; i<256; i++ ) {
132
133 libspectrum_snap_set_slt_length( snap, i, slt_length[i] );
134
135 if( slt_length[i] ) {
136
137 buffer = libspectrum_new( libspectrum_byte, slt_length[i] );
138
139 memcpy( buffer, slt[i], slt_length[i] );
140 libspectrum_snap_set_slt( snap, i, buffer );
141 }
142 }
143
144 if( slt_screen ) {
145
146 buffer = libspectrum_new( libspectrum_byte, 6912 );
147
148 memcpy( buffer, slt_screen, 6912 );
149 libspectrum_snap_set_slt_screen( snap, buffer );
150 libspectrum_snap_set_slt_screen_level( snap, slt_screen_level );
151 }
152 }
153