Mercurial > repos > blastem
comparison serialize.c @ 1427:4e5797b3935a
WIP - New savestate format
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 06 Aug 2017 00:06:36 -0700 |
parents | |
children | 2540c05520f2 |
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1426:957325c990d5 | 1427:4e5797b3935a |
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1 #include <string.h> | |
2 #include <stdlib.h> | |
3 #include <stdio.h> | |
4 #include "serialize.h" | |
5 #include "util.h" | |
6 | |
7 #ifndef SERIALIZE_DEFAULT_SIZE | |
8 #define SERIALIZE_DEFAULT_SIZE (256*1024) //default to enough for a Genesis save state | |
9 #endif | |
10 | |
11 | |
12 void init_serialize(serialize_buffer *buf) | |
13 { | |
14 buf->storage = SERIALIZE_DEFAULT_SIZE; | |
15 buf->size = 0; | |
16 buf->current_section_start = 0; | |
17 buf->data = malloc(SERIALIZE_DEFAULT_SIZE); | |
18 } | |
19 | |
20 static void reserve(serialize_buffer *buf, size_t amount) | |
21 { | |
22 if (amount > (buf->storage - buf->size)) { | |
23 buf->storage *= 2; | |
24 buf = realloc(buf, buf->storage + sizeof(*buf)); | |
25 } | |
26 } | |
27 | |
28 void save_int32(serialize_buffer *buf, uint32_t val) | |
29 { | |
30 reserve(buf, sizeof(val)); | |
31 buf->data[buf->size++] = val >> 24; | |
32 buf->data[buf->size++] = val >> 16; | |
33 buf->data[buf->size++] = val >> 8; | |
34 buf->data[buf->size++] = val; | |
35 } | |
36 | |
37 void save_int16(serialize_buffer *buf, uint16_t val) | |
38 { | |
39 reserve(buf, sizeof(val)); | |
40 buf->data[buf->size++] = val >> 8; | |
41 buf->data[buf->size++] = val; | |
42 } | |
43 | |
44 void save_int8(serialize_buffer *buf, uint8_t val) | |
45 { | |
46 reserve(buf, sizeof(val)); | |
47 buf->data[buf->size++] = val; | |
48 } | |
49 | |
50 void save_string(serialize_buffer *buf, char *val) | |
51 { | |
52 size_t len = strlen(val); | |
53 save_buffer8(buf, val, len); | |
54 } | |
55 | |
56 void save_buffer8(serialize_buffer *buf, void *val, size_t len) | |
57 { | |
58 reserve(buf, len); | |
59 memcpy(&buf->data[buf->size], val, len); | |
60 buf->size += len; | |
61 } | |
62 | |
63 void save_buffer16(serialize_buffer *buf, uint16_t *val, size_t len) | |
64 { | |
65 reserve(buf, len * sizeof(*val)); | |
66 for(; len != 0; len--, val++) { | |
67 buf->data[buf->size++] = *val >> 8; | |
68 buf->data[buf->size++] = *val; | |
69 } | |
70 } | |
71 | |
72 void save_buffer32(serialize_buffer *buf, uint32_t *val, size_t len) | |
73 { | |
74 reserve(buf, len * sizeof(*val)); | |
75 for(; len != 0; len--, val++) { | |
76 buf->data[buf->size++] = *val >> 24; | |
77 buf->data[buf->size++] = *val >> 16; | |
78 buf->data[buf->size++] = *val >> 8; | |
79 buf->data[buf->size++] = *val; | |
80 } | |
81 } | |
82 | |
83 void start_section(serialize_buffer *buf, uint16_t section_id) | |
84 { | |
85 save_int16(buf, section_id); | |
86 //reserve some space for size once we end this section | |
87 reserve(buf, sizeof(uint32_t)); | |
88 buf->size += sizeof(uint32_t); | |
89 //save start point for use in end_device | |
90 buf->current_section_start = buf->size; | |
91 } | |
92 | |
93 void end_section(serialize_buffer *buf) | |
94 { | |
95 size_t section_size = buf->size - buf->current_section_start; | |
96 if (section_size > 0xFFFFFFFFU) { | |
97 fatal_error("Sections larger than 4GB are not supported"); | |
98 } | |
99 uint32_t size = section_size; | |
100 uint8_t *field = buf->data + buf->current_section_start - sizeof(uint32_t); | |
101 *(field++) = size >> 24; | |
102 *(field++) = size >> 16; | |
103 *(field++) = size >> 8; | |
104 *(field++) = size; | |
105 buf->current_section_start = 0; | |
106 } | |
107 | |
108 void register_section_handler(deserialize_buffer *buf, section_handler handler, uint16_t section_id) | |
109 { | |
110 if (section_id > buf->max_handler) { | |
111 uint16_t old_max = buf->max_handler; | |
112 if (buf->max_handler < 0x8000) { | |
113 buf->max_handler *= 2; | |
114 } else { | |
115 buf->max_handler = 0xFFFF; | |
116 } | |
117 buf->handlers = realloc(buf->handlers, (buf->max_handler+1) * sizeof(handler)); | |
118 memset(buf->handlers + old_max + 1, 0, (buf->max_handler - old_max) * sizeof(handler)); | |
119 } | |
120 if (!buf->handlers) { | |
121 buf->handlers = calloc(buf->max_handler + 1, sizeof(handler)); | |
122 } | |
123 buf->handlers[section_id] = handler; | |
124 } | |
125 | |
126 void init_deserialize(deserialize_buffer *buf, uint8_t *data, size_t size) | |
127 { | |
128 buf->size = size; | |
129 buf->cur_pos = 0; | |
130 buf->data = data; | |
131 buf->handlers = NULL; | |
132 buf->max_handler = 8; | |
133 } | |
134 | |
135 uint32_t load_int32(deserialize_buffer *buf) | |
136 { | |
137 uint32_t val; | |
138 if ((buf->size - buf->cur_pos) < sizeof(val)) { | |
139 fatal_error("Failed to load required int32 field"); | |
140 } | |
141 val = buf->data[buf->cur_pos++] << 24; | |
142 val |= buf->data[buf->cur_pos++] << 16; | |
143 val |= buf->data[buf->cur_pos++] << 8; | |
144 val |= buf->data[buf->cur_pos++]; | |
145 return val; | |
146 } | |
147 | |
148 uint16_t load_int16(deserialize_buffer *buf) | |
149 { | |
150 uint16_t val; | |
151 if ((buf->size - buf->cur_pos) < sizeof(val)) { | |
152 fatal_error("Failed to load required int16 field"); | |
153 } | |
154 val = buf->data[buf->cur_pos++] << 8; | |
155 val |= buf->data[buf->cur_pos++]; | |
156 return val; | |
157 } | |
158 | |
159 uint8_t load_int8(deserialize_buffer *buf) | |
160 { | |
161 uint8_t val; | |
162 if ((buf->size - buf->cur_pos) < sizeof(val)) { | |
163 fatal_error("Failed to load required int8 field"); | |
164 } | |
165 val = buf->data[buf->cur_pos++]; | |
166 return val; | |
167 } | |
168 | |
169 void load_buffer8(deserialize_buffer *buf, void *dst, size_t len) | |
170 { | |
171 if ((buf->size - buf->cur_pos) < len) { | |
172 fatal_error("Failed to load required buffer of size %d", len); | |
173 } | |
174 memcpy(dst, buf->data + buf->cur_pos, len); | |
175 buf->cur_pos += len; | |
176 } | |
177 | |
178 void load_buffer16(deserialize_buffer *buf, uint16_t *dst, size_t len) | |
179 { | |
180 if ((buf->size - buf->cur_pos) < len * sizeof(uint16_t)) { | |
181 fatal_error("Failed to load required buffer of size %d\n", len); | |
182 } | |
183 for(; len != 0; len--, dst++) { | |
184 uint16_t value = buf->data[buf->cur_pos++] << 8; | |
185 value |= buf->data[buf->cur_pos++]; | |
186 *dst = value; | |
187 } | |
188 } | |
189 void load_buffer32(deserialize_buffer *buf, uint32_t *dst, size_t len) | |
190 { | |
191 if ((buf->size - buf->cur_pos) < len * sizeof(uint32_t)) { | |
192 fatal_error("Failed to load required buffer of size %d\n", len); | |
193 } | |
194 for(; len != 0; len--, dst++) { | |
195 uint32_t value = buf->data[buf->cur_pos++] << 24; | |
196 value |= buf->data[buf->cur_pos++] << 16; | |
197 value |= buf->data[buf->cur_pos++] << 8; | |
198 value |= buf->data[buf->cur_pos++]; | |
199 *dst = value; | |
200 } | |
201 } | |
202 | |
203 void load_section(deserialize_buffer *buf) | |
204 { | |
205 if (!buf->handlers) { | |
206 fatal_error("load_section called on a deserialize_buffer with no handlers registered\n"); | |
207 } | |
208 uint16_t section_id = load_int16(buf); | |
209 uint32_t size = load_int32(buf); | |
210 if (size > (buf->size - buf->cur_pos)) { | |
211 fatal_error("Section is bigger than remaining space in file"); | |
212 } | |
213 if (section_id > buf->max_handler || !buf->handlers[section_id].fun) { | |
214 warning("No handler for section ID %d, save state may be from a newer version\n", section_id); | |
215 buf->cur_pos += size; | |
216 return; | |
217 } | |
218 deserialize_buffer section; | |
219 init_deserialize(§ion, buf->data + buf->cur_pos, size); | |
220 buf->handlers[section_id].fun(§ion, buf->handlers[section_id].data); | |
221 buf->cur_pos += size; | |
222 } | |
223 | |
224 static const char sz_ident[] = "BLSTSZ\x01\x07"; | |
225 | |
226 uint8_t save_to_file(serialize_buffer *buf, char *path) | |
227 { | |
228 FILE *f = fopen(path, "wb"); | |
229 if (!f) { | |
230 return 0; | |
231 } | |
232 if (fwrite(sz_ident, 1, sizeof(sz_ident)-1, f) != sizeof(sz_ident)-1) { | |
233 fclose(f); | |
234 return 0; | |
235 } | |
236 if (fwrite(buf->data, 1, buf->size, f) != buf->size) { | |
237 fclose(f); | |
238 return 0; | |
239 } | |
240 fclose(f); | |
241 return 1; | |
242 } | |
243 | |
244 uint8_t load_from_file(deserialize_buffer *buf, char *path) | |
245 { | |
246 FILE *f = fopen(path, "rb"); | |
247 if (!f) { | |
248 return 0; | |
249 } | |
250 char ident[sizeof(sz_ident)-1]; | |
251 long size = file_size(f); | |
252 if (size < sizeof(ident)) { | |
253 fclose(f); | |
254 return 0; | |
255 } | |
256 if (fread(ident, 1, sizeof(ident), f) != sizeof(ident)) { | |
257 fclose(f); | |
258 return 0; | |
259 } | |
260 fclose(f); | |
261 if (memcmp(ident, sz_ident, sizeof(ident))) { | |
262 return 0; | |
263 } | |
264 buf->size = size - sizeof(ident); | |
265 buf->cur_pos = 0; | |
266 buf->data = malloc(buf->size); | |
267 buf->handlers = NULL; | |
268 buf->max_handler = 8; | |
269 if (fread(buf->data, 1, buf->size, f) != buf->size) { | |
270 free(buf->data); | |
271 buf->data = NULL; | |
272 buf->size = 0; | |
273 return 0; | |
274 } | |
275 return 1; | |
276 } |