1 //
2 // Copyright(C) 2005-2014 Simon Howard
3 //
4 // This program is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU General Public License
6 // as published by the Free Software Foundation; either version 2
7 // of the License, or (at your option) any later version.
8 //
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13 //
14 //
15 // Parses "Frame" sections in dehacked files
16 //
17
18 #include <stdio.h>
19 #include <stdlib.h>
20
21 #include "doomtype.h"
22 #include "d_items.h"
23 #include "info.h"
24
25 #include "deh_defs.h"
26 #include "deh_io.h"
27 #include "deh_main.h"
28 #include "deh_mapping.h"
29
DEH_BEGIN_MAPPING(state_mapping,state_t)30 DEH_BEGIN_MAPPING(state_mapping, state_t)
31 DEH_MAPPING("Sprite number", sprite)
32 DEH_MAPPING("Sprite subnumber", frame)
33 DEH_MAPPING("Duration", tics)
34 DEH_MAPPING("Next frame", nextstate)
35 DEH_UNSUPPORTED_MAPPING("Action pointer")
36 DEH_END_MAPPING
37
38 static void *DEH_FrameStart(deh_context_t *context, char *line)
39 {
40 int frame_number = 0;
41 state_t *state;
42
43 if (sscanf(line, "Frame %i", &frame_number) != 1)
44 {
45 DEH_Warning(context, "Parse error on section start");
46 return NULL;
47 }
48
49 if (frame_number < 0 || frame_number >= NUMSTATES)
50 {
51 DEH_Warning(context, "Invalid frame number: %i", frame_number);
52 return NULL;
53 }
54
55 if (frame_number >= DEH_VANILLA_NUMSTATES)
56 {
57 DEH_Warning(context, "Attempt to modify frame %i: this will cause "
58 "problems in Vanilla dehacked.", frame_number);
59 }
60
61 state = &states[frame_number];
62
63 return state;
64 }
65
66 // Simulate a frame overflow: Doom has 967 frames in the states[] array, but
67 // DOS dehacked internally only allocates memory for 966. As a result,
68 // attempts to set frame 966 (the last frame) will overflow the dehacked
69 // array and overwrite the weaponinfo[] array instead.
70 //
71 // This is noticable in Batman Doom where it is impossible to switch weapons
72 // away from the fist once selected.
73
DEH_FrameOverflow(deh_context_t * context,char * varname,int value)74 static void DEH_FrameOverflow(deh_context_t *context, char *varname, int value)
75 {
76 if (!strcasecmp(varname, "Duration"))
77 {
78 weaponinfo[0].ammo = value;
79 }
80 else if (!strcasecmp(varname, "Codep frame"))
81 {
82 weaponinfo[0].upstate = value;
83 }
84 else if (!strcasecmp(varname, "Next frame"))
85 {
86 weaponinfo[0].downstate = value;
87 }
88 else if (!strcasecmp(varname, "Unknown 1"))
89 {
90 weaponinfo[0].readystate = value;
91 }
92 else if (!strcasecmp(varname, "Unknown 2"))
93 {
94 weaponinfo[0].atkstate = value;
95 }
96 else
97 {
98 DEH_Error(context, "Unable to simulate frame overflow: field '%s'",
99 varname);
100 }
101 }
102
DEH_FrameParseLine(deh_context_t * context,char * line,void * tag)103 static void DEH_FrameParseLine(deh_context_t *context, char *line, void *tag)
104 {
105 state_t *state;
106 char *variable_name, *value;
107 int ivalue;
108
109 if (tag == NULL)
110 return;
111
112 state = (state_t *) tag;
113
114 // Parse the assignment
115
116 if (!DEH_ParseAssignment(line, &variable_name, &value))
117 {
118 // Failed to parse
119
120 DEH_Warning(context, "Failed to parse assignment");
121 return;
122 }
123
124 // all values are integers
125
126 ivalue = atoi(value);
127
128 if (state == &states[NUMSTATES - 1])
129 {
130 DEH_FrameOverflow(context, variable_name, ivalue);
131 }
132 else
133 {
134 // set the appropriate field
135
136 DEH_SetMapping(context, &state_mapping, state, variable_name, ivalue);
137 }
138 }
139
DEH_FrameSHA1Sum(sha1_context_t * context)140 static void DEH_FrameSHA1Sum(sha1_context_t *context)
141 {
142 int i;
143
144 for (i=0; i<NUMSTATES; ++i)
145 {
146 DEH_StructSHA1Sum(context, &state_mapping, &states[i]);
147 }
148 }
149
150 deh_section_t deh_section_frame =
151 {
152 "Frame",
153 NULL,
154 DEH_FrameStart,
155 DEH_FrameParseLine,
156 NULL,
157 DEH_FrameSHA1Sum,
158 };
159
160