asar coverage - build #322

src/asar/
File: src/asar/libsmw.cpp
Date: 2025-10-31 07:59:23
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1 #include <algorithm>
2 #include "asar.h"
3 #include "libmisc.h"
4 #include "crc32.h"
5
6 #include "platform/file-helpers.h"
7
8 mapper_t mapper=lorom;
9 int sa1banks[8]={0<<20, 1<<20, -1, -1, 2<<20, 3<<20, -1, -1};
10 const unsigned char * romdata= nullptr; // NOTE: Changed into const to prevent direct write access - use writeromdata() functions below
11 int romlen;
12 static bool header;
13 unsigned char freespacebyte;
14 static FileHandleType thisfile = InvalidFileHandle;
15
16 autoarray<writtenblockdata> writtenblocks;
17 static int last_writtenblock_ind = 0;
18 // not immediately put into writtenblocks to allow the freespace finder to use
19 // the reclaimed space.
20 static autoarray<writtenblockdata> cleared_rats_tag_blocks;
21 std::vector<writtenblockdata> found_rats_tags;
22 bool found_rats_tags_initialized;
23
24 // RPG Hacker: Uses binary search to find the insert position of our ROM write
25 483469 static int findromwritepos(int snesoffset, int searchstartpos, int searchendpos)
26 {
27
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 483469 if (searchendpos == searchstartpos)
28 {
29 139441 return searchstartpos;
30 }
31
32 344028 int centerpos = searchstartpos + ((searchendpos - searchstartpos) / 2);
33
34
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 344028 if (writtenblocks[centerpos].snesoffset >= snesoffset)
35 {
36 126868 return findromwritepos(snesoffset, searchstartpos, centerpos);
37 }
38
39 217160 return findromwritepos(snesoffset, centerpos + 1, searchendpos);
40 }
41
42
43 150447 static void addromwriteforbank(int snesoffset, int numbytes)
44 {
45
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 156342 if(numbytes == 0) return;
46
47 // common case: this rom write is immediately after the last one.
48
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 150289 if(last_writtenblock_ind < writtenblocks.count) {
49
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 150073 auto& blk = writtenblocks[last_writtenblock_ind];
50
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 150073 if(blk.snesoffset + blk.numbytes == snesoffset && (blk.snesoffset&0xff0000)==(snesoffset&0xff0000)) {
51 // check if we overlap with next block
52 24600 if(last_writtenblock_ind+1 >= writtenblocks.count
53
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 12300 || writtenblocks[last_writtenblock_ind+1].snesoffset > snesoffset+numbytes) {
54 // if not, merge with previous written block
55 11822 blk.numbytes += numbytes;
56 11822 return;
57 }
58 }
59 }
60 138467 int currentbank = (snesoffset & 0xFF0000);
61
62
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 138467 int insertpos = findromwritepos(snesoffset, 0, writtenblocks.count);
63
64
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 138207 if (insertpos > 0 && (writtenblocks[insertpos - 1].snesoffset & 0xFF0000) == currentbank
65
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 276674 && writtenblocks[insertpos - 1].snesoffset + writtenblocks[insertpos - 1].numbytes >= snesoffset)
66 {
67 // Merge if we overlap with a preceding block
68
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 137367 int firstend = writtenblocks[insertpos - 1].snesoffset + writtenblocks[insertpos - 1].numbytes;
69 137367 int secondend = snesoffset + numbytes;
70
71
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 137367 int newend = (firstend > secondend ? firstend : secondend);
72
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 137367 numbytes = newend - writtenblocks[insertpos - 1].snesoffset;
74
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 137367 snesoffset = writtenblocks[insertpos - 1].snesoffset;
75
76 137367 writtenblocks.remove(insertpos - 1);
77 137367 insertpos -= 1;
78 }
79
80
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 265211 while (insertpos < writtenblocks.count && (writtenblocks[insertpos].snesoffset & 0xFF0000) == currentbank
81
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 265768 && snesoffset + numbytes >= writtenblocks[insertpos].snesoffset)
82 {
83 // Merge if we overlap with a succeeding block
84 557 int firstend = snesoffset + numbytes;
85
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 557 int secondend = writtenblocks[insertpos].snesoffset + writtenblocks[insertpos].numbytes;
86
87
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 557 int newend = (firstend > secondend ? firstend : secondend);
88
89 557 numbytes = newend - snesoffset;
90
91 557 writtenblocks.remove(insertpos);
92 }
93
94 // Insert ROM write
95 69313 writtenblockdata blockdata;
96 138467 blockdata.snesoffset = snesoffset;
97 138467 blockdata.pcoffset = snestopc(snesoffset);
98 138467 blockdata.numbytes = numbytes;
99
100
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 138467 writtenblocks.insert(insertpos, blockdata);
101 138467 last_writtenblock_ind = insertpos;
102 }
103
104
105 150289 void addromwrite(int pcoffset, int numbytes)
106 {
107 150289 int snesaddr = pctosnes(pcoffset);
108 150289 int bytesleft = numbytes;
109
110 // RPG Hacker: Some kind of witchcraft which I actually hope works as intended
111 // Basically, the purpose of this is to sort all ROM writes into banks for the sake of cleanness
112
113
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 150447 while ((snesaddr >> 16) != ((snesaddr + bytesleft) >> 16))
114 {
115 158 int bytesinbank = ((snesaddr + 0x10000) & 0xffff0000) - snesaddr;
116
117 158 addromwriteforbank(snesaddr, bytesinbank);
118
119 158 pcoffset += bytesinbank;
120 158 snesaddr = pctosnes(pcoffset);
121 158 bytesleft -= bytesinbank;
122 }
123
124 150289 addromwriteforbank(snesaddr, bytesleft);
125 150289 }
126
127 27 void writeromdata(int pcoffset, const void * indata, int numbytes)
128 {
129
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 27 memcpy(const_cast<unsigned char*>(romdata) + pcoffset, indata, (size_t)numbytes);
130 27 addromwrite(pcoffset, numbytes);
131 27 }
132
133 149668 void writeromdata_byte(int pcoffset, unsigned char indata, bool add_write)
134 {
135 149668 memcpy(const_cast<unsigned char*>(romdata) + pcoffset, &indata, 1);
136
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 149668 if(add_write)
137 140546 addromwrite(pcoffset, 1);
138 149668 }
139
140 127 void writeromdata_bytes(int pcoffset, unsigned char indata, int numbytes, bool add_write)
141 {
142
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 127 memset(const_cast<unsigned char*>(romdata) + pcoffset, indata, (size_t)numbytes);
143
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 127 if(add_write)
144 ✗ addromwrite(pcoffset, numbytes);
145 127 }
146
147 110 int ratsstart(int snesaddr)
148 {
149 110 int pcaddr=snestopc(snesaddr);
150
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 110 if (pcaddr<0) return -1;
151 106 const unsigned char * start=romdata+pcaddr-0x10000;
152
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 132252 for (int i=0x10000;i>=0 && start+i >= romdata;i--)
153 {
154
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 132250 if (!strncmp((const char*)start+i, "STAR", 4) &&
155
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 104 (start[i+4]^start[i+6])==0xFF && (start[i+5]^start[i+7])==0xFF)
156 {
157
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 104 if ((start[i+4]|(start[i+5]<<8))>0x10000-i-8-1) return pctosnes((int)(start-romdata+i));
158 ✗ return -1;
159 }
160 }
161 2 return -1;
162 }
163
164 6 static void handleprot(int loc, char * name, int len, const unsigned char * contents)
165 {
166 (void)loc; // RPG Hacker: Silence "unused argument" warning.
167
168
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 6 if (!strncmp(name, "PROT", 4))
169 {
170
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 6 memcpy(name, "NULL", 4);//to block recursion, in case someone is an idiot
171
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 6 if (len%3) return;
172 6 len/=3;
173
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 14 for (int i=0;i<len;i++) removerats((contents[(i*3)+0] )|(contents[(i*3)+1]<<8 )|(contents[(i*3)+2]<<16), 0x00);
174 }
175 }
176
177 28 void removerats(int snesaddr, unsigned char clean_byte)
178 {
179 28 int addr=ratsstart(snesaddr);
180
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 28 if (addr<0) return;
181 // randomdude999: don't forget bank borders
182 28 WalkMetadata(pctosnes(snestopc(addr)+8), handleprot);
183 28 addr=snestopc(addr);
184 // don't use writeromdata() because this must not go to the writtenblocks list.
185
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 28 int len = (romdata[addr+4]|(romdata[addr+5]<<8))+9;
186
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 28 memset(const_cast<unsigned char*>(romdata) + addr, clean_byte, len);
187
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 28 cleared_rats_tag_blocks[cleared_rats_tag_blocks.count] = writtenblockdata{addr, 0, len};
188 }
189
190 275 void handle_cleared_rats_tags()
191 {
192
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 303 for(int i = 0; i < cleared_rats_tag_blocks.count; i++) {
193 28 auto & block = cleared_rats_tag_blocks[i];
194 28 addromwrite(block.pcoffset, block.numbytes);
195 }
196 275 cleared_rats_tag_blocks.reset();
197 275 }
198
199 54 static void find_rats_tags()
200 {
201 // TODO: should probably look for overlapping rats tags too, just in case.
202 // note that found_rats_tags must not have overlaps, but we can merge overlapped rats tags into one
203 54 found_rats_tags.clear();
204
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 37749006 for(int pos = 0; pos < romlen;) {
205
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 37748952 if (!strncmp((const char*)romdata+pos, "STAR", 4) &&
206
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 4 (romdata[pos+4]^romdata[pos+6])==0xFF &&
207
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 4 (romdata[pos+5]^romdata[pos+7])==0xFF) {
208
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 4 int block_len = (romdata[pos+4]|(romdata[pos+5]<<8))+1+8;
209
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 4 found_rats_tags.push_back(writtenblockdata{pos, 0, block_len});
210 4 pos += block_len;
211 4 } else {
212 37748948 pos++;
213 }
214 }
215 54 found_rats_tags_initialized = true;
216 54 }
217
218 562 static inline int trypcfreespace(int start, int alt_start, int end, int size, int banksize, int minalign, unsigned char freespacebyte, bool write_rats)
219 {
220
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 562 if(alt_start >= 0) start = std::max(start, alt_start);
221
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 562 if(!found_rats_tags_initialized) find_rats_tags();
222
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 143160 while (start+size<=end)
223 {
224
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 143122 if (write_rats &&
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 142878 ((start+8)&~banksize)!=((start+size-1)&~banksize&0xFFFFFF)//if the contents won't fit in this bank...
226 )
227 {
228 // if we are not already at the end of the bank
229
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 2578 if((start&banksize&0xFFFFF8) != (banksize&0xFFFFF8)) {
230 2574 start&=~banksize&0xFFFFFF;//round it down to the start of the bank,
231 2574 start|=banksize&0xFFFFF8;//then round it up to the end minus the RATS tag...
232 72586 continue;
233 //} else if((start&banksize) == (banksize&0xFFFFF8)) {
234 // we are exactly 8 bytes off the end, allow this one to continue
235 } else {
236 // less than 8 bytes left in this bank
237 // go to the start of the next bank
238 4 start = (start+7) & ~7;
239 4 continue;
240 }
241 }
242
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 140544 else if(!write_rats &&
243
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 244 (start&~banksize) != ((start+size-1)&~banksize))
244 {
245 // go to next bank.
246 ✗ start = (start|banksize)+1;
247 ✗ continue;
248 }
249
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 140544 if (minalign)
250 {
251 6 start&=~minalign&0xFFFFFF;
252 6 start|=minalign&0xFFFFF8;
253 }
254 140544 bool bad=false;
255
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 8817016 for (int i=0;i<size;i++)
256 {
257
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 8816040 if (romdata[start+i]!=freespacebyte)
258 {
259 // TheBiob: fix freedata align freezing.
260
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 139568 if ((start & minalign) == 0x7FF8 && i < 8) i = 8;
261 139568 start+=i;
262
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 139568 if (!i) start++;//this could check for a rats tag instead, but somehow I think this will give better performance.
263 139568 bad=true;
264 139568 break;
265 }
266 }
267
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 140544 if (bad) continue;
268 // check against collisions with rats tags.
269 // lower_bound returns first element where comp() is false,
270 // i.e. the first RATS tag that starts after our spot
271
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 976 auto rats = std::lower_bound(found_rats_tags.begin(), found_rats_tags.end(), start, [](writtenblockdata& blk, int start){
272 14 return blk.pcoffset < start;
273 });
274 // if there's a rats tag after us,
275
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 976 if(rats != found_rats_tags.end()) {
276 // check that it doesn't intersect our spot
277
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 4 if(rats->pcoffset < start+size) {
278 // our spot ends inside this rats tag, skip to the end of it
279 ✗ start = rats->pcoffset + rats->numbytes;
280 ✗ continue;
281 }
282 }
283 // if there's a rats tag before us,
284
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 976 if(rats != found_rats_tags.begin()) {
285 10 rats--;
286 // and it doesn't end before our spot starts,
287
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 10 if(start >= rats->pcoffset && start < rats->pcoffset+rats->numbytes) {
288 // we're inside this rats tag, skip to its end
289 2 start = rats->pcoffset + rats->numbytes;
290 2 continue;
291 }
292 }
293 // check against collisions with any written blocks.
294 // written blocks go through like 3x snes->pc->snes and are then sorted by snes.
295 // todo: this is janky..... should sort writtenblocks by pc maybe??
296 974 int snesstart = pctosnes(start);
297 // this gives the index of the first block whose snespos is >= start.
298
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 974 int writtenblock_pos = findromwritepos(snesstart, 0, writtenblocks.count);
299 // we might need to check the preceding block too.
300 // (but we don't need to check any older ones, as blocks are merged together)
301
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 974 if(writtenblock_pos > 0) writtenblock_pos--;
302
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 1492 for(; writtenblock_pos < writtenblocks.count; writtenblock_pos++)
303 {
304
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 980 auto & block = writtenblocks[writtenblock_pos];
305
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 980 if(snesstart < block.snesoffset+block.numbytes
306
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 462 && snesstart+size > block.snesoffset)
307 {
308 450 start = block.pcoffset + block.numbytes;
309 450 bad = true;
310 450 break;
311 }
312 // blocks are sorted by snesoffset, so if they start after our end we know there are no more that could intersect
313
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 530 if(block.snesoffset > snesstart+size) break;
314 }
315
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 974 if (bad) continue;
316
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 524 if(write_rats)
317 {
318 486 size-=8;
319
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 486 addromwrite(start+8, size);
320
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 486 if (size) size--;//rats tags eat one byte more than specified for some reason
321
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 486 writeromdata_byte(start+0, 'S');
322
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 486 writeromdata_byte(start+1, 'T');
323
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 486 writeromdata_byte(start+2, 'A');
324
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 486 writeromdata_byte(start+3, 'R');
325
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 486 writeromdata_byte(start+4, (unsigned char)(size&0xFF));
326
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 486 writeromdata_byte(start+5, (unsigned char)((size>>8)&0xFF));
327
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 486 writeromdata_byte(start+6, (unsigned char)((size&0xFF)^0xFF));
328
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 486 writeromdata_byte(start+7, (unsigned char)(((size>>8)&0xFF)^0xFF));
329 505 return start+8;
330 }
331 else
332 {
333 // not sure if needs to be done here,
334 // but it needs to be done somewhere
335
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 38 addromwrite(start, size);
336 38 return start;
337 }
338 }
339 38 return -1;
340 }
341
342 40 static void expandrom(int newromlen) {
343 40 writeromdata_bytes(romlen, freespacebyte, newromlen - romlen, false);
344 40 romlen = newromlen;
345 40 int log_len = 0;
346
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 846 for(; 1<<log_len < romlen; log_len++);
347 40 writeromdata_byte(snestopc(0xffd7), log_len - 10);
348 40 }
349
350 //This function finds a block of freespace. -1 means "no freespace found", anything else is a PC address.
351 //isforcode=false tells it to favor banks 40+, true tells it to avoid them entirely.
352 //It automatically adds a RATS tag.
353
354 524 int getpcfreespace(int size, int target_bank, bool autoexpand, bool respectbankborders, bool align, bool write_rats, int search_start)
355 {
356 // TODO: probably should error if specifying target_bank and align, or target_bank and respectbankborders
357
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 524 if (!size) {
358 // return a dummy valid address. 0x8000 should work in most mappers
359 ✗ if(target_bank >= 0) return snestopc(target_bank << 16 | 0x8000);
360 ✗ return 0;
361 }
362
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 524 if (size>0x10000 && (write_rats || respectbankborders)) return -1;
363 524 bool isforcode = target_bank == -2;
364
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 524 if(write_rats)
365 486 size+=8;
366
367 270 auto find_for_fixed_bank = [&](int banksize, bool force_high_half = false) {
368
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 16 if(!force_high_half && (target_bank & 0x40) == 0x40)
369
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 2 return trypcfreespace(snestopc(target_bank<<16), search_start, min(romlen, snestopc(target_bank<<16)+0x10000), size, banksize, 0, freespacebyte, write_rats);
370 else
371
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 14 return trypcfreespace(snestopc(target_bank<<16 | 0x8000), search_start, min(romlen, snestopc(target_bank<<16 | 0x8000)+0x8000), size, banksize, 0, freespacebyte, write_rats);
372 524 };
373
374
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 524 if (mapper==lorom)
375 {
376
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 510 if(target_bank >= 0) return find_for_fixed_bank(0x7fff);
377
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 498 if (size>0x8008 && respectbankborders) return -1;
378 517 rebootlorom:
379
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 536 if (romlen>0x200000 && !isforcode)
380 {
381
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 56 int pos=trypcfreespace(search_start >= 0 ? 0 : 0x200000-8, search_start, (romlen<0x400000)?romlen:0x400000, size,
382
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 28 respectbankborders?0x7FFF:0xFFFFFF, align?0x7FFF:(respectbankborders || size<32768)?0:0x7FFF, freespacebyte, write_rats);
383
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 28 if (pos>=0) return pos;
384 }
385
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 1010 int pos=trypcfreespace(search_start >= 0 ? 0 : 0x80000, search_start, (romlen<0x200000)?romlen:0x200000, size,
386
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 502 respectbankborders?0x7FFF:0xFFFFFF, align?0x7FFF:(respectbankborders || size<32768)?0:0x7FFF, freespacebyte, write_rats);
387
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 508 if (pos>=0) return pos;
388
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 38 if (autoexpand)
389 {
390 if(0);
391
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 38 else if (romlen==0x080000) expandrom(0x10'0000);
392
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 4 else if (romlen==0x100000) expandrom(0x20'0000);
393
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 2 else if (isforcode) return -1;//no point creating freespace that can't be used
394
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 2 else if (romlen==0x200000 || romlen==0x300000)
395
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 2 expandrom(0x40'0000);
396 ✗ else return -1;
397 38 autoexpand=false;
398 38 goto rebootlorom;
399 }
400 }
401
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 14 if (mapper==hirom)
402 {
403
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 10 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
404 while(true) {
405
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 6 if (isforcode) {
406
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 2 for(int i = 0x8000; i < min(romlen, 0x40'0000); i += 0x1'0000){
407
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 2 int space = trypcfreespace(i, search_start, min(i+0x7FFF, romlen), size, 0x7FFF, align?0xFFFF:0, freespacebyte, write_rats);
408
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 2 if(space != -1) return space;
409 }
410 } else {
411
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 4 int space = trypcfreespace(0, search_start, romlen, size, respectbankborders?0xFFFF:0xFFFFFF, align?0xFFFF:0, freespacebyte, write_rats);
412
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 4 if(space != -1) return space;
413 }
414 ✗ if(!autoexpand || romlen >= 0x40'0000) break;
415 // new len = next power of 2 from current romlen (but at least a bank....)
416 ✗ int newlen = 0x1'0000;
417 ✗ for(; newlen <= romlen; newlen*=2);
418 ✗ expandrom(newlen);
419 ✗ }
420 ✗ return -1;
421 }
422
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 4 if (mapper==exlorom)
423 {
424 ✗ if(target_bank >= 0) return find_for_fixed_bank(0x7fff);
425 // RPG Hacker: Not really 100% sure what to do here, but I suppose this simplified code will do
426 // and we won't need all the complicated stuff from LoROM above?
427 ✗ if (isforcode)
428 {
429 ✗ trypcfreespace(0, search_start, min(romlen, 0x200000), size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
430 }
431 ✗ return trypcfreespace(0, search_start, romlen, size, 0x7FFF, align ? 0x7FFF : 0, freespacebyte, write_rats);
432 }
433
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 4 if (mapper==exhirom)
434 {
435 ✗ if(target_bank >= 0) return find_for_fixed_bank(0xffff);
436 ✗ if (isforcode)
437 {
438 ✗ for(int i = 0x8000; i < romlen && i < 0x400000; i += 0x10000){
439 ✗ int space = trypcfreespace(i, search_start, min(i+0x7FFF, romlen), size, 0x7FFF, align?0xFFFF:0, freespacebyte, write_rats);
440 ✗ if(space != -1) return space;
441 }
442 ✗ return -1;
443 }
444 ✗ return trypcfreespace(0, search_start, romlen, size, respectbankborders?0xFFFF:0xFFFFFF, align?0xFFFF:0, freespacebyte, write_rats);
445 }
446
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 4 if (mapper==sfxrom)
447 {
448
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 2 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
449
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 2 if (!isforcode) return -1;
450 // try not to overwrite smw stuff
451
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 2 return trypcfreespace(search_start >= 0 ? 0 : 0x80000, search_start, romlen, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
452 }
453
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 2 if (mapper==sa1rom)
454 {
455
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 2 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
456 4 rebootsa1rom:
457 4 int nextbank=-1;
458
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 20 for (int i=0;i<8;i++)
459 {
460
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 18 if (i&2) continue;
461
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 10 if (sa1banks[i]+0x100000>romlen)
462 {
463
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 8 if (sa1banks[i]<=romlen && sa1banks[i]+0x100000>romlen) nextbank=sa1banks[i];
464 8 continue;
465 }
466
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 2 int pos=trypcfreespace(sa1banks[i]?sa1banks[i]:0x80000, search_start, sa1banks[i]+0x100000, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
467
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 2 if (pos>=0) return pos;
468 }
469
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 2 if (autoexpand && nextbank>=0)
470 {
471
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 2 expandrom(nextbank+0x10'0000);
472 2 autoexpand=false;
473 2 goto rebootsa1rom;
474 }
475 }
476 ✗ if (mapper==bigsa1rom)
477 {
478 ✗ if(target_bank >= 0) return find_for_fixed_bank(0xffff);
479 ✗ if(!isforcode && romlen > 0x400000)
480 {
481 ✗ int pos=trypcfreespace(0x400000, search_start, romlen, size, 0xFFFF, align?0xFFFF:0, freespacebyte, write_rats);
482 ✗ if(pos>=0) return pos;
483 }
484 ✗ int pos=trypcfreespace(search_start >= 0 ? 0 : 0x080000, search_start, romlen, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
485 ✗ if(pos>=0) return pos;
486 }
487 ✗ return -1;
488 }
489
490 28 void WalkMetadata(int loc, void(*func)(int loc, char * name, int len, const unsigned char * contents))
491 {
492 28 int pcoff=snestopc(loc);
493
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 28 if (strncmp((const char*)romdata+pcoff-8, "STAR", 4)) return;
494 28 const unsigned char * metadata=romdata+pcoff;
495
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 34 while (is_upper(metadata[0]) && is_upper(metadata[1]) && is_upper(metadata[2]) && is_upper(metadata[3]))
496 {
497
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 10 if (!strncmp((const char*)metadata, "STOP", 4))
498 {
499 4 metadata=romdata+pcoff;
500
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 10 while (is_upper(metadata[0]) && is_upper(metadata[1]) && is_upper(metadata[2]) && is_upper(metadata[3]))
501 {
502
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 10 if (!strncmp((const char*)metadata, "STOP", 4))
503 {
504 4 break;
505 }
506 6 func(pctosnes((int)(metadata-romdata)), (char*)const_cast<unsigned char*>(metadata), metadata[4], metadata+5);
507 6 metadata+=5+metadata[4];
508 }
509 4 break;
510 }
511 6 metadata+=5+metadata[4];
512 }
513 }
514
515 524 int getsnesfreespace(int size, int target_bank, bool autoexpand, bool respectbankborders, bool align, bool write_rats, int search_start)
516 {
517 524 int pcfree = getpcfreespace(size, target_bank, autoexpand, respectbankborders, align, write_rats, snestopc(search_start));
518 524 int snesfree = pctosnes(pcfree);
519
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 524 if(snesfree == -1) return -1;
520 524 bool isforcode = target_bank == -2;
521 // not sure if this is ever a concern for other mappers...
522
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 524 if(isforcode && (mapper == hirom || mapper == exhirom)) {
523 2 snesfree = snesfree & ~0x400000;
524 // maybe this should throw an internal error or something instead lol
525
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 2 if((snesfree&0x8000) != 0x8000) return -1;
526 }
527 524 return snesfree;
528 }
529
530 3 bool openrom(const char * filename, bool confirm)
531 {
532 3 closerom();
533 3 thisfile = open_file(filename, FileOpenMode_ReadWrite);
534
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 3 if (thisfile == InvalidFileHandle)
535 {
536 ✗ throw_err_null(pass, err_open_rom_failed);
537 ✗ return false;
538 }
539 3 header=false;
540
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 3 if (strlen(filename)>4)
541 {
542
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 3 const char * fnameend=strchr(filename, '\0')-4;
543
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 3 header=(!stricmp(fnameend, ".smc"));
544 }
545
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 3 romlen=(int)get_file_size(thisfile)-(header*512);
546
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 3 if (romlen<0) romlen=0;
547
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 3 set_file_pos(thisfile, header*512);
548 3 romdata=(unsigned char*)malloc(sizeof(unsigned char)*16*1024*1024);
549 3 int truelen=(int)read_file(thisfile, (void*)romdata, (uint32_t)romlen);
550
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 3 if (truelen!=romlen)
551 {
552 ✗ free(const_cast<unsigned char*>(romdata));
553 ✗ throw_err_null(pass, err_open_rom_failed);
554 ✗ return false;
555 }
556
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 3 memset(const_cast<unsigned char*>(romdata)+romlen, 0x00, (size_t)(16*1024*1024-romlen));
557
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 3 if (confirm && snestopc(0x00FFC0)+21<(int)romlen && strncmp((const char*)romdata+snestopc(0x00FFC0), "SUPER MARIOWORLD ", 21))
558 {
559 ✗ closerom(false);
560 ✗ if(header) throw_err_null(pass, err_open_rom_not_smw_extension);
561 ✗ else throw_err_null(pass, err_open_rom_not_smw_header);
562 ✗ return false;
563 }
564
565 3 romdata_r=(unsigned char*)malloc((size_t)romlen);
566 3 romlen_r=romlen;
567
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 3 memcpy((void*)romdata_r, romdata, (size_t)romlen);//recently allocated, dead
568
569 3 return true;
570 }
571
572 6 uint32_t closerom(bool save)
573 {
574 6 uint32_t romCrc = 0;
575
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 6 if (thisfile != InvalidFileHandle && save && romlen)
576 {
577
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 3 set_file_pos(thisfile, header*512);
578 3 write_file(thisfile, romdata, (uint32_t)romlen);
579
580 // do a quick re-read of the header, and include that in the crc32 calculation if necessary
581 {
582
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 3 uint8_t* filedata = (uint8_t*)malloc(sizeof(uint8_t) * (romlen + header * 512));
583
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 3 if (header)
584 {
585 ✗ set_file_pos(thisfile, 0u);
586 ✗ read_file(thisfile, filedata, 512);
587 }
588
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 3 memcpy(filedata + (header * 512), romdata, sizeof(uint8_t) * (size_t)romlen);
589
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 3 romCrc = crc32(filedata, (unsigned int)(romlen + header * 512));
590 3 free(filedata);
591 }
592 }
593
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 6 if (thisfile != InvalidFileHandle) close_file(thisfile);
594
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 6 if (romdata) free(const_cast<unsigned char*>(romdata));
595
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 6 if (romdata_r) free(const_cast<unsigned char*>(romdata_r));
596 6 thisfile= InvalidFileHandle;
597 6 romdata= nullptr;
598 6 romdata_r = nullptr;
599 6 romlen=0;
600 6 return romCrc;
601 }
602
603 27 static unsigned int getchecksum()
604 {
605 27 unsigned int checksum=0;
606
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 27 if((romlen & (romlen-1)) == 0)
607 {
608 // romlen is a power of 2, just add up all the bytes
609
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 131107 for (int i=0;i<romlen;i++) checksum+=romdata[i];
610 }
611 else
612 {
613 // assume romlen is the sum of 2 powers of 2 - i haven't seen any real rom that isn't,
614 // and if you make such a rom, fixing its checksum is your problem.
615 4 int firstpart = bitround(romlen) >> 1;
616 4 int secondpart = romlen - firstpart;
617
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 4 int repeatcount = firstpart / secondpart;
618 4 unsigned int secondpart_sum = 0;
619
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 32782 for(int i = 0; i < firstpart; i++) checksum += romdata[i];
620
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 12 for(int i = firstpart; i < romlen; i++) secondpart_sum += romdata[i];
621 4 checksum += secondpart_sum * repeatcount;
622 }
623 27 return checksum&0xFFFF;
624 }
625
626 27 void fixchecksum()
627 {
628 // randomdude999: clear out checksum bytes before recalculating checksum, this should make it correct on roms that don't have a checksum yet
629 27 writeromdata(snestopc(0x00FFDC), "\xFF\xFF\0\0", 4);
630 27 int checksum=(int)getchecksum();
631 27 writeromdata_byte(snestopc(0x00FFDE), (unsigned char)(checksum&255));
632 27 writeromdata_byte(snestopc(0x00FFDF), (unsigned char)((checksum>>8)&255));
633 27 writeromdata_byte(snestopc(0x00FFDC), (unsigned char)((checksum&255)^255));
634 27 writeromdata_byte(snestopc(0x00FFDD), (unsigned char)(((checksum>>8)&255)^255));
635 27 }
636