asar coverage - build #102

src/asar/
File: src/asar/libsmw.cpp
Date: 2024-01-19 21:01:10
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1 #include <algorithm>
2 #include "asar.h"
3 #include "crc32.h"
4
5 #include "platform/file-helpers.h"
6
7 mapper_t mapper=lorom;
8 int sa1banks[8]={0<<20, 1<<20, -1, -1, 2<<20, 3<<20, -1, -1};
9 const unsigned char * romdata= nullptr; // NOTE: Changed into const to prevent direct write access - use writeromdata() functions below
10 int romlen;
11 static bool header;
12 static FileHandleType thisfile = InvalidFileHandle;
13
14 asar_error_id openromerror;
15
16 autoarray<writtenblockdata> writtenblocks;
17 // not immediately put into writtenblocks to allow the freespace finder to use
18 // the reclaimed space.
19 autoarray<writtenblockdata> cleared_rats_tag_blocks;
20 std::vector<writtenblockdata> found_rats_tags;
21 bool found_rats_tags_initialized;
22
23 // RPG Hacker: Uses binary search to find the insert position of our ROM write
24 1037786 static int findromwritepos(int snesoffset, int searchstartpos, int searchendpos)
25 {
26
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 1595704 if (searchendpos == searchstartpos)
27 {
28 239920 return searchstartpos;
29 }
30
31 1116030 int centerpos = searchstartpos + ((searchendpos - searchstartpos) / 2);
32
33
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 1116030 if (writtenblocks[centerpos].snesoffset >= snesoffset)
34 {
35 198243 return findromwritepos(snesoffset, searchstartpos, centerpos);
36 }
37
38 719605 return findromwritepos(snesoffset, centerpos + 1, searchendpos);
39 }
40
41
42 476986 static void addromwriteforbank(int snesoffset, int numbytes)
43 {
44 476986 int currentbank = (snesoffset & 0xFF0000);
45
46
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 476986 int insertpos = findromwritepos(snesoffset, 0, writtenblocks.count);
47
48
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 475646 if (insertpos > 0 && (writtenblocks[insertpos - 1].snesoffset & 0xFF0000) == currentbank
49
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 951809 && writtenblocks[insertpos - 1].snesoffset + writtenblocks[insertpos - 1].numbytes >= snesoffset)
50 {
51 // Merge if we overlap with a preceding block
52
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 471970 int firstend = writtenblocks[insertpos - 1].snesoffset + writtenblocks[insertpos - 1].numbytes;
53 471970 int secondend = snesoffset + numbytes;
54
55
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 236037 int newend = (firstend > secondend ? firstend : secondend);
56
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 471970 numbytes = newend - writtenblocks[insertpos - 1].snesoffset;
58
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 471970 snesoffset = writtenblocks[insertpos - 1].snesoffset;
59
60 471970 writtenblocks.remove(insertpos - 1);
61 236037 insertpos -= 1;
62 }
63
64
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 631752 while (insertpos < writtenblocks.count && (writtenblocks[insertpos].snesoffset & 0xFF0000) == currentbank
65
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 773464 && snesoffset + numbytes >= writtenblocks[insertpos].snesoffset)
66 {
67 // Merge if we overlap with a succeeding block
68 1581 int firstend = snesoffset + numbytes;
69
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 3130 int secondend = writtenblocks[insertpos].snesoffset + writtenblocks[insertpos].numbytes;
70
71
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 1581 int newend = (firstend > secondend ? firstend : secondend);
72
73 3130 numbytes = newend - snesoffset;
74
75 3130 writtenblocks.remove(insertpos);
76 }
77
78 // Insert ROM write
79 writtenblockdata blockdata;
80 476986 blockdata.snesoffset = snesoffset;
81 476986 blockdata.pcoffset = snestopc(snesoffset);
82 476986 blockdata.numbytes = numbytes;
83
84
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 476986 writtenblocks.insert(insertpos, blockdata);
85 476986 }
86
87
88 476498 void addromwrite(int pcoffset, int numbytes)
89 {
90 476498 int snesaddr = pctosnes(pcoffset);
91 238331 int bytesleft = numbytes;
92
93 // RPG Hacker: Some kind of witchcraft which I actually hope works as intended
94 // Basically, the purpose of this is to sort all ROM writes into banks for the sake of cleanness
95
96
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 476986 while (((snesaddr >> 16) & 0xFF) != (((snesaddr + bytesleft) >> 16) & 0xFF))
97 {
98 488 int bytesinbank = ((snesaddr + 0x10000) & 0xFF0000) - snesaddr;
99
100 488 addromwriteforbank(snesaddr, bytesinbank);
101
102 488 pcoffset += bytesinbank;
103 488 snesaddr = pctosnes(pcoffset);
104 488 bytesleft -= bytesinbank;
105 }
106
107 476498 addromwriteforbank(snesaddr, bytesleft);
108 476498 }
109
110 470 void writeromdata(int pcoffset, const void * indata, int numbytes)
111 {
112 470 memcpy(const_cast<unsigned char*>(romdata) + pcoffset, indata, (size_t)numbytes);
113 470 addromwrite(pcoffset, numbytes);
114 470 }
115
116 448051 void writeromdata_byte(int pcoffset, unsigned char indata)
117 {
118 448051 memcpy(const_cast<unsigned char*>(romdata) + pcoffset, &indata, 1);
119 448051 addromwrite(pcoffset, 1);
120 448051 }
121
122 ✗ void writeromdata_bytes(int pcoffset, unsigned char indata, int numbytes)
123 {
124 ✗ memset(const_cast<unsigned char*>(romdata) + pcoffset, indata, (size_t)numbytes);
125 ✗ addromwrite(pcoffset, numbytes);
126 ✗ }
127
128 204 int ratsstart(int snesaddr)
129 {
130 204 int pcaddr=snestopc(snesaddr);
131
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 204 if (pcaddr<0x7FFF8) return -1;
132 180 const unsigned char * start=romdata+pcaddr-0x10000;
133
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 2952 for (int i=0x10000;i>=0;i--)
134 {
135
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 2952 if (!strncmp((const char*)start+i, "STAR", 4) &&
136
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 180 (start[i+4]^start[i+6])==0xFF && (start[i+5]^start[i+7])==0xFF)
137 {
138
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 180 if ((start[i+4]|(start[i+5]<<8))>0x10000-i-8-1) return pctosnes((int)(start-romdata+i));
139 ✗ return -1;
140 }
141 }
142 ✗ return -1;
143 }
144
145 18 static void handleprot(int loc, char * name, int len, const unsigned char * contents)
146 {
147 (void)loc; // RPG Hacker: Silence "unused argument" warning.
148
149
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 18 if (!strncmp(name, "PROT", 4))
150 {
151 18 memcpy(name, "NULL", 4);//to block recursion, in case someone is an idiot
152
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 18 if (len%3) return;
153 18 len/=3;
154
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 42 for (int i=0;i<len;i++) removerats((contents[(i*3)+0] )|(contents[(i*3)+1]<<8 )|(contents[(i*3)+2]<<16), 0x00);
155 }
156 }
157
158 48 void removerats(int snesaddr, unsigned char clean_byte)
159 {
160 48 int addr=ratsstart(snesaddr);
161
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 48 if (addr<0) return;
162 // randomdude999: don't forget bank borders
163 42 WalkMetadata(pctosnes(snestopc(addr)+8), handleprot);
164 42 addr=snestopc(addr);
165 // don't use writeromdata() because this must not go to the writtenblocks list.
166 42 int len = (romdata[addr+4]|(romdata[addr+5]<<8))+9;
167 42 memset(const_cast<unsigned char*>(romdata) + addr, clean_byte, len);
168 42 cleared_rats_tag_blocks[cleared_rats_tag_blocks.count] = writtenblockdata{addr, 0, len};
169 }
170
171 692 void handle_cleared_rats_tags()
172 {
173
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 734 for(int i = 0; i < cleared_rats_tag_blocks.count; i++) {
174 21 auto & block = cleared_rats_tag_blocks[i];
175 42 addromwrite(block.pcoffset, block.numbytes);
176 }
177 692 cleared_rats_tag_blocks.reset();
178 692 }
179
180 120 void find_rats_tags()
181 {
182 // TODO: should probably look for overlapping rats tags too, just in case.
183 // note that found_rats_tags must not have overlaps, but we can merge overlapped rats tags into one
184 120 found_rats_tags.clear();
185
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 88080384 for(int pos = 0; pos < romlen;) {
186
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 88080264 if (!strncmp((const char*)romdata+pos, "STAR", 4) &&
187
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 12 (romdata[pos+4]^romdata[pos+6])==0xFF &&
188
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 12 (romdata[pos+5]^romdata[pos+7])==0xFF) {
189 12 int block_len = (romdata[pos+4]|(romdata[pos+5]<<8))+1+8;
190
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 12 found_rats_tags.push_back(writtenblockdata{pos, 0, block_len});
191 12 pos += block_len;
192 12 } else {
193 88080252 pos++;
194 }
195 }
196 120 found_rats_tags_initialized = true;
197 120 }
198
199 1518 static inline int trypcfreespace(int start, int alt_start, int end, int size, int banksize, int minalign, unsigned char freespacebyte, bool write_rats)
200 {
201
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 1524 if(alt_start >= 0) start = std::max(start, alt_start);
202
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 1518 if(!found_rats_tags_initialized) find_rats_tags();
203
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 428334 while (start+size<=end)
204 {
205
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 428244 if (write_rats &&
206
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 427740 ((start+8)&~banksize)!=((start+size-1)&~banksize&0xFFFFFF)//if the contents won't fit in this bank...
207 )
208 {
209 // if we are not already at the end of the bank
210
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 7734 if((start&banksize&0xFFFFF8) != (banksize&0xFFFFF8)) {
211 7722 start&=~banksize&0xFFFFFF;//round it down to the start of the bank,
212 7722 start|=banksize&0xFFFFF8;//then round it up to the end minus the RATS tag...
213 217269 continue;
214 //} else if((start&banksize) == (banksize&0xFFFFF8)) {
215 // we are exactly 8 bytes off the end, allow this one to continue
216 } else {
217 // less than 8 bytes left in this bank
218 // go to the start of the next bank
219 12 start = (start+7) & ~7;
220 12 continue;
221 }
222 }
223
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 210507 else if(!write_rats &&
224
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 504 (start&~banksize) != ((start+size-1)&~banksize))
225 {
226 // go to next bank.
227 ✗ start = (start|banksize)+1;
228 ✗ continue;
229 }
230
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 420510 if (minalign)
231 {
232 18 start&=~minalign&0xFFFFFF;
233 18 start|=minalign&0xFFFFF8;
234 }
235 210255 bool bad=false;
236
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 26447328 for (int i=0;i<size;i++)
237 {
238
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 26444634 if (romdata[start+i]!=freespacebyte)
239 {
240 // TheBiob: fix freedata align freezing.
241
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 417816 if ((start & minalign) == 0x7FF8 && i < 8) i = 8;
242 417816 start+=i;
243
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 417816 if (!i) start++;//this could check for a rats tag instead, but somehow I think this will give better performance.
244 208908 bad=true;
245 208908 break;
246 }
247 }
248
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 419163 if (bad) continue;
249 // check against collisions with rats tags.
250 // lower_bound returns first element where comp() is false,
251 // i.e. the first RATS tag that starts after our spot
252
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 2694 auto rats = std::lower_bound(found_rats_tags.begin(), found_rats_tags.end(), start, [](writtenblockdata& blk, int start){
253
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 42 return blk.pcoffset < start;
254 });
255 // if there's a rats tag after us,
256
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 2694 if(rats != found_rats_tags.end()) {
257 // check that it doesn't intersect our spot
258
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 12 if(rats->pcoffset < start+size) {
259 // our spot ends inside this rats tag, skip to the end of it
260 ✗ start = rats->pcoffset + rats->numbytes;
261 ✗ continue;
262 }
263 }
264 // if there's a rats tag before us,
265
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 2694 if(rats != found_rats_tags.begin()) {
266 15 rats--;
267 // and it doesn't end before our spot starts,
268
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 30 if(start >= rats->pcoffset && start < rats->pcoffset+rats->numbytes) {
269 // we're inside this rats tag, skip to its end
270 6 start = rats->pcoffset + rats->numbytes;
271 6 continue;
272 }
273 }
274 // check against collisions with any written blocks.
275 // written blocks go through like 3x snes->pc->snes and are then sorted by snes.
276 // todo: this is janky..... should sort writtenblocks by pc maybe??
277 2688 int snesstart = pctosnes(start);
278 // this gives the index of the first block whose snespos is >= start.
279
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 2688 int writtenblock_pos = findromwritepos(snesstart, 0, writtenblocks.count);
280 // we might need to check the preceding block too.
281 // (but we don't need to check any older ones, as blocks are merged together)
282
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 2688 if(writtenblock_pos > 0) writtenblock_pos--;
283
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 4476 for(; writtenblock_pos < writtenblocks.count; writtenblock_pos++)
284 {
285
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 1533 auto & block = writtenblocks[writtenblock_pos];
286
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 3066 if(snesstart < block.snesoffset+block.numbytes
287
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 1278 && snesstart+size > block.snesoffset)
288 {
289 1260 start = block.pcoffset + block.numbytes;
290 630 bad = true;
291 630 break;
292 }
293 // blocks are sorted by snesoffset, so if they start after our end we know there are no more that could intersect
294
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 1806 if(block.snesoffset > snesstart+size) break;
295 }
296
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 1974 if (bad) continue;
297
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 1428 if(write_rats)
298 {
299 1356 size-=8;
300
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 1356 addromwrite(start+8, size);
301
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 1356 if (size) size--;//rats tags eat one byte more than specified for some reason
302
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 1356 writeromdata_byte(start+0, 'S');
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 1356 writeromdata_byte(start+1, 'T');
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 1356 writeromdata_byte(start+2, 'A');
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 1356 writeromdata_byte(start+3, 'R');
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 1356 writeromdata_byte(start+4, (unsigned char)(size&0xFF));
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 1356 writeromdata_byte(start+5, (unsigned char)((size>>8)&0xFF));
308
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 1356 writeromdata_byte(start+6, (unsigned char)((size&0xFF)^0xFF));
309
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 1356 writeromdata_byte(start+7, (unsigned char)(((size>>8)&0xFF)^0xFF));
310 1392 return start+8;
311 }
312 else
313 {
314 // not sure if needs to be done here,
315 // but it needs to be done somewhere
316
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 72 addromwrite(start, size);
317 72 return start;
318 }
319 }
320 45 return -1;
321 }
322
323 //This function finds a block of freespace. -1 means "no freespace found", anything else is a PC address.
324 //isforcode=false tells it to favor banks 40+, true tells it to avoid them entirely.
325 //It automatically adds a RATS tag.
326
327 1434 int getpcfreespace(int size, int target_bank, bool autoexpand, bool respectbankborders, bool align, unsigned char freespacebyte, bool write_rats, int search_start)
328 {
329 // TODO: probably should error if specifying target_bank and align, or target_bank and respectbankborders
330
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 1434 if (!size) {
331 // return a dummy valid address. 0x8000 should work in most mappers
332
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 6 if(target_bank >= 0) return snestopc(target_bank << 16 | 0x8000);
333 3 return 0;
334 }
335
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 1428 if (size>0x10000) return -1;
336 1428 bool isforcode = target_bank == -2;
337
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 1428 if(write_rats)
338 1356 size+=8;
339
340 30 auto find_for_fixed_bank = [&](int banksize, bool force_high_half = false) {
341
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 30 if(!force_high_half && (target_bank & 0x40) == 0x40)
342 6 return trypcfreespace(snestopc(target_bank<<16), search_start, min(romlen, snestopc(target_bank<<16)+0x10000), size, banksize, 0, freespacebyte, write_rats);
343 else
344 24 return trypcfreespace(snestopc(target_bank<<16 | 0x8000), search_start, min(romlen, snestopc(target_bank<<16 | 0x8000)+0x8000), size, banksize, 0, freespacebyte, write_rats);
345 1428 };
346
347
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 1428 if (mapper==lorom)
348 {
349
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 1386 if(target_bank >= 0) return find_for_fixed_bank(0x7fff);
350
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 1368 if (size>0x8008 && respectbankborders) return -1;
351 1368 rebootlorom:
352
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 1458 if (romlen>0x200000 && !isforcode)
353 {
354
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 210 int pos=trypcfreespace(search_start >= 0 ? 0 : 0x200000-8, search_start, (romlen<0x400000)?romlen:0x400000, size,
355
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 84 respectbankborders?0x7FFF:0xFFFFFF, align?0x7FFF:(respectbankborders || size<32768)?0:0x7FFF, freespacebyte, write_rats);
356
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 84 if (pos>=0) return pos;
357 }
358
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 3423 int pos=trypcfreespace(search_start >= 0 ? 0 : 0x80000, search_start, (romlen<0x200000)?romlen:0x200000, size,
359
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 1356 respectbankborders?0x7FFF:0xFFFFFF, align?0x7FFF:(respectbankborders || size<32768)?0:0x7FFF, freespacebyte, write_rats);
360
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 1374 if (pos>=0) return pos;
361
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 90 if (autoexpand)
362 {
363 if(0);
364
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 90 else if (romlen==0x080000)
365 {
366 78 romlen=0x100000;
367
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 78 writeromdata_byte(snestopc(0x00FFD7), 0x0A);
368 }
369
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 12 else if (romlen==0x100000)
370 {
371 6 romlen=0x200000;
372
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 6 writeromdata_byte(snestopc(0x00FFD7), 0x0B);
373 }
374
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 6 else if (isforcode) return -1;//no point creating freespace that can't be used
375
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 6 else if (romlen==0x200000 || romlen==0x300000)
376 {
377 6 romlen=0x400000;
378
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 6 writeromdata_byte(snestopc(0x00FFD7), 0x0C);
379 }
380 ✗ else return -1;
381 45 autoexpand=false;
382 90 goto rebootlorom;
383 }
384 }
385
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 42 if (mapper==hirom)
386 {
387
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 30 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
388
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 18 if (isforcode)
389 {
390
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 6 for(int i = 0x8000; i < min(romlen, 0x400000); i += 0x10000){
391
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 9 int space = trypcfreespace(i, search_start, min(i+0x7FFF, romlen), size, 0x7FFF, align?0xFFFF:0, freespacebyte, write_rats);
392
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 6 if(space != -1) return space;
393 }
394 ✗ return -1;
395 }
396
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 18 return trypcfreespace(0, search_start, romlen, size, 0xFFFF, align?0xFFFF:0, freespacebyte, write_rats);
397 }
398
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 12 if (mapper==exlorom)
399 {
400 ✗ if(target_bank >= 0) return find_for_fixed_bank(0x7fff);
401 // RPG Hacker: Not really 100% sure what to do here, but I suppose this simplified code will do
402 // and we won't need all the complicated stuff from LoROM above?
403 ✗ if (isforcode)
404 {
405 ✗ trypcfreespace(0, search_start, min(romlen, 0x200000), size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
406 }
407 ✗ return trypcfreespace(0, search_start, romlen, size, 0x7FFF, align ? 0x7FFF : 0, freespacebyte, write_rats);
408 }
409
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 12 if (mapper==exhirom)
410 {
411 ✗ if(target_bank >= 0) return find_for_fixed_bank(0xffff);
412 ✗ if (isforcode)
413 {
414 ✗ for(int i = 0x8000; i < romlen && i < 0x400000; i += 0x10000){
415 ✗ int space = trypcfreespace(i, search_start, min(i+0x7FFF, romlen), size, 0x7FFF, align?0xFFFF:0, freespacebyte, write_rats);
416 ✗ if(space != -1) return space;
417 }
418 ✗ return -1;
419 }
420 ✗ return trypcfreespace(0, search_start, romlen, size, 0xFFFF, align?0xFFFF:0, freespacebyte, write_rats);
421 }
422
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 12 if (mapper==sfxrom)
423 {
424
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 6 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
425
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 6 if (!isforcode) return -1;
426 // try not to overwrite smw stuff
427
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 12 return trypcfreespace(search_start >= 0 ? 0 : 0x80000, search_start, romlen, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
428 }
429
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 6 if (mapper==sa1rom)
430 {
431
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 6 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
432 6 rebootsa1rom:
433 6 int nextbank=-1;
434
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 60 for (int i=0;i<8;i++)
435 {
436
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 54 if (i&2) continue;
437
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 30 if (sa1banks[i]+0x100000>romlen)
438 {
439
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 24 if (sa1banks[i]<=romlen && sa1banks[i]+0x100000>romlen) nextbank=sa1banks[i];
440 24 continue;
441 }
442
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 9 int pos=trypcfreespace(sa1banks[i]?sa1banks[i]:0x80000, search_start, sa1banks[i]+0x100000, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
443
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 6 if (pos>=0) return pos;
444 }
445
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 6 if (autoexpand && nextbank>=0)
446 {
447 6 unsigned char x7FD7[]={0, 0x0A, 0x0B, 0x0C, 0x0C, 0x0D, 0x0D, 0x0D, 0x0D};
448 6 romlen=nextbank+0x100000;
449
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 6 writeromdata_byte(0x7FD7, x7FD7[romlen>>20]);
450 3 autoexpand=false;
451 6 goto rebootsa1rom;
452 }
453 }
454 ✗ if (mapper==bigsa1rom)
455 {
456 ✗ if(target_bank >= 0) return find_for_fixed_bank(0xffff);
457 ✗ if(!isforcode && romlen > 0x400000)
458 {
459 ✗ int pos=trypcfreespace(0x400000, search_start, romlen, size, 0xFFFF, align?0xFFFF:0, freespacebyte, write_rats);
460 ✗ if(pos>=0) return pos;
461 }
462 ✗ int pos=trypcfreespace(search_start >= 0 ? 0 : 0x080000, search_start, romlen, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
463 ✗ if(pos>=0) return pos;
464 }
465 ✗ return -1;
466 }
467
468 42 void WalkMetadata(int loc, void(*func)(int loc, char * name, int len, const unsigned char * contents))
469 {
470 42 int pcoff=snestopc(loc);
471
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 42 if (strncmp((const char*)romdata+pcoff-8, "STAR", 4)) return;
472 42 const unsigned char * metadata=romdata+pcoff;
473
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 60 while (is_upper(metadata[0]) && is_upper(metadata[1]) && is_upper(metadata[2]) && is_upper(metadata[3]))
474 {
475
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 30 if (!strncmp((const char*)metadata, "STOP", 4))
476 {
477 6 metadata=romdata+pcoff;
478
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 30 while (is_upper(metadata[0]) && is_upper(metadata[1]) && is_upper(metadata[2]) && is_upper(metadata[3]))
479 {
480
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 30 if (!strncmp((const char*)metadata, "STOP", 4))
481 {
482 6 break;
483 }
484 18 func(pctosnes((int)(metadata-romdata)), (char*)const_cast<unsigned char*>(metadata), metadata[4], metadata+5);
485 18 metadata+=5+metadata[4];
486 }
487 6 break;
488 }
489 18 metadata+=5+metadata[4];
490 }
491 }
492
493 1434 int getsnesfreespace(int size, int target_bank, bool autoexpand, bool respectbankborders, bool align, unsigned char freespacebyte, bool write_rats, int search_start)
494 {
495 1434 return pctosnes(getpcfreespace(size, target_bank, autoexpand, respectbankborders, align, freespacebyte, write_rats, snestopc(search_start)));
496 }
497
498 236 bool openrom(const char * filename, bool confirm)
499 {
500 236 closerom();
501 236 thisfile = open_file(filename, FileOpenMode_ReadWrite);
502
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 236 if (thisfile == InvalidFileHandle)
503 {
504 ✗ openromerror = error_id_open_rom_failed;
505 ✗ return false;
506 }
507 236 header=false;
508
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 236 if (strlen(filename)>4)
509 {
510 236 const char * fnameend=strchr(filename, '\0')-4;
511 236 header=(!stricmp(fnameend, ".smc"));
512 }
513 236 romlen=(int)get_file_size(thisfile)-(header*512);
514
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 236 if (romlen<0) romlen=0;
515 236 set_file_pos(thisfile, header*512);
516 236 romdata=(unsigned char*)malloc(sizeof(unsigned char)*16*1024*1024);
517 236 int truelen=(int)read_file(thisfile, (void*)romdata, (uint32_t)romlen);
518
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 236 if (truelen!=romlen)
519 {
520 ✗ openromerror = error_id_open_rom_failed;
521 ✗ free(const_cast<unsigned char*>(romdata));
522 ✗ return false;
523 }
524 236 memset(const_cast<unsigned char*>(romdata)+romlen, 0x00, (size_t)(16*1024*1024-romlen));
525
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 236 if (confirm && snestopc(0x00FFC0)+21<(int)romlen && strncmp((const char*)romdata+snestopc(0x00FFC0), "SUPER MARIOWORLD ", 21))
526 {
527 ✗ closerom(false);
528 ✗ openromerror = header ? error_id_open_rom_not_smw_extension : error_id_open_rom_not_smw_header;
529 ✗ return false;
530 }
531
532 236 romdata_r=(unsigned char*)malloc((size_t)romlen);
533 236 romlen_r=romlen;
534 236 memcpy((void*)romdata_r, romdata, (size_t)romlen);//recently allocated, dead
535
536 236 return true;
537 }
538
539 472 uint32_t closerom(bool save)
540 {
541 236 uint32_t romCrc = 0;
542
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 472 if (thisfile != InvalidFileHandle && save && romlen)
543 {
544 160 set_file_pos(thisfile, header*512);
545 160 write_file(thisfile, romdata, (uint32_t)romlen);
546
547 // do a quick re-read of the header, and include that in the crc32 calculation if necessary
548 {
549 160 uint8_t* filedata = (uint8_t*)malloc(sizeof(uint8_t) * (romlen + header * 512));
550
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 160 if (header)
551 {
552 ✗ set_file_pos(thisfile, 0u);
553 ✗ read_file(thisfile, filedata, 512);
554 }
555 160 memcpy(filedata + (header * 512), romdata, sizeof(uint8_t) * (size_t)romlen);
556 160 romCrc = crc32(filedata, (unsigned int)(romlen + header * 512));
557 160 free(filedata);
558 }
559 }
560
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 472 if (thisfile != InvalidFileHandle) close_file(thisfile);
561
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 472 if (romdata) free(const_cast<unsigned char*>(romdata));
562
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 472 if (romdata_r) free(const_cast<unsigned char*>(romdata_r));
563 472 thisfile= InvalidFileHandle;
564 472 romdata= nullptr;
565 472 romdata_r = nullptr;
566 472 romlen=0;
567 472 return romCrc;
568 }
569
570 470 static unsigned int getchecksum()
571 {
572 244 unsigned int checksum=0;
573
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 470 if((romlen & (romlen-1)) == 0)
574 {
575 // romlen is a power of 2, just add up all the bytes
576
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 123732385 for (int i=0;i<romlen;i++) checksum+=romdata[i];
577 }
578 else
579 {
580 // assume romlen is the sum of 2 powers of 2 - i haven't seen any real rom that isn't,
581 // and if you make such a rom, fixing its checksum is your problem.
582 195 int firstpart = bitround(romlen) >> 1;
583 195 int secondpart = romlen - firstpart;
584 195 int repeatcount = firstpart / secondpart;
585 99 unsigned int secondpart_sum = 0;
586
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 33732081 for(int i = 0; i < firstpart; i++) checksum += romdata[i];
587
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 29362709 for(int i = firstpart; i < romlen; i++) secondpart_sum += romdata[i];
588 195 checksum += secondpart_sum * repeatcount;
589 }
590 470 return checksum&0xFFFF;
591 }
592
593 470 void fixchecksum()
594 {
595 // randomdude999: clear out checksum bytes before recalculating checksum, this should make it correct on roms that don't have a checksum yet
596 470 writeromdata(snestopc(0x00FFDC), "\xFF\xFF\0\0", 4);
597 470 int checksum=(int)getchecksum();
598 470 writeromdata_byte(snestopc(0x00FFDE), (unsigned char)(checksum&255));
599 470 writeromdata_byte(snestopc(0x00FFDF), (unsigned char)((checksum>>8)&255));
600 470 writeromdata_byte(snestopc(0x00FFDC), (unsigned char)((checksum&255)^255));
601 470 writeromdata_byte(snestopc(0x00FFDD), (unsigned char)(((checksum>>8)&255)^255));
602 470 }
603