asar coverage - build #301

src/asar/
File: src/asar/libsmw.cpp
Date: 2025-03-18 20:16:22
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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 483266 static int findromwritepos(int snesoffset, int searchstartpos, int searchendpos)
26 {
27
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 483266 if (searchendpos == searchstartpos)
28 {
29 139381 return searchstartpos;
30 }
31
32 343885 int centerpos = searchstartpos + ((searchendpos - searchstartpos) / 2);
33
34
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 343885 if (writtenblocks[centerpos].snesoffset >= snesoffset)
35 {
36 126830 return findromwritepos(snesoffset, searchstartpos, centerpos);
37 }
38
39 217055 return findromwritepos(snesoffset, centerpos + 1, searchendpos);
40 }
41
42
43 150399 static void addromwriteforbank(int snesoffset, int numbytes)
44 {
45
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 156290 if(numbytes == 0) return;
46
47 // common case: this rom write is immediately after the last one.
48
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 150240 if(last_writtenblock_ind < writtenblocks.count) {
49
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 150023 auto& blk = writtenblocks[last_writtenblock_ind];
50
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 150023 if(blk.snesoffset + blk.numbytes == snesoffset && (blk.snesoffset&0xff0000)==(snesoffset&0xff0000)) {
51 // check if we overlap with next block
52 24586 if(last_writtenblock_ind+1 >= writtenblocks.count
53
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 12293 || writtenblocks[last_writtenblock_ind+1].snesoffset > snesoffset+numbytes) {
54 // if not, merge with previous written block
55 11815 blk.numbytes += numbytes;
56 11815 return;
57 }
58 }
59 }
60 138425 int currentbank = (snesoffset & 0xFF0000);
61
62
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 138425 int insertpos = findromwritepos(snesoffset, 0, writtenblocks.count);
63
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 138164 if (insertpos > 0 && (writtenblocks[insertpos - 1].snesoffset & 0xFF0000) == currentbank
65
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 276589 && writtenblocks[insertpos - 1].snesoffset + writtenblocks[insertpos - 1].numbytes >= snesoffset)
66 {
67 // Merge if we overlap with a preceding block
68
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 137324 int firstend = writtenblocks[insertpos - 1].snesoffset + writtenblocks[insertpos - 1].numbytes;
69 137324 int secondend = snesoffset + numbytes;
70
71
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 137324 int newend = (firstend > secondend ? firstend : secondend);
72
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 137324 numbytes = newend - writtenblocks[insertpos - 1].snesoffset;
74
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 137324 snesoffset = writtenblocks[insertpos - 1].snesoffset;
75
76 137324 writtenblocks.remove(insertpos - 1);
77 137324 insertpos -= 1;
78 }
79
80
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 265149 while (insertpos < writtenblocks.count && (writtenblocks[insertpos].snesoffset & 0xFF0000) == currentbank
81
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 265705 && snesoffset + numbytes >= writtenblocks[insertpos].snesoffset)
82 {
83 // Merge if we overlap with a succeeding block
84 556 int firstend = snesoffset + numbytes;
85
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 556 int secondend = writtenblocks[insertpos].snesoffset + writtenblocks[insertpos].numbytes;
86
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 556 int newend = (firstend > secondend ? firstend : secondend);
88
89 556 numbytes = newend - snesoffset;
90
91 556 writtenblocks.remove(insertpos);
92 }
93
94 // Insert ROM write
95 69296 writtenblockdata blockdata;
96 138425 blockdata.snesoffset = snesoffset;
97 138425 blockdata.pcoffset = snestopc(snesoffset);
98 138425 blockdata.numbytes = numbytes;
99
100
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 138425 writtenblocks.insert(insertpos, blockdata);
101 138425 last_writtenblock_ind = insertpos;
102 }
103
104
105 150240 void addromwrite(int pcoffset, int numbytes)
106 {
107 150240 int snesaddr = pctosnes(pcoffset);
108 150240 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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 150399 while ((snesaddr >> 16) != ((snesaddr + bytesleft) >> 16))
114 {
115 159 int bytesinbank = ((snesaddr + 0x10000) & 0xffff0000) - snesaddr;
116
117 159 addromwriteforbank(snesaddr, bytesinbank);
118
119 159 pcoffset += bytesinbank;
120 159 snesaddr = pctosnes(pcoffset);
121 159 bytesleft -= bytesinbank;
122 }
123
124 150240 addromwriteforbank(snesaddr, bytesleft);
125 150240 }
126
127 28 void writeromdata(int pcoffset, const void * indata, int numbytes)
128 {
129
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 28 memcpy(const_cast<unsigned char*>(romdata) + pcoffset, indata, (size_t)numbytes);
130 28 addromwrite(pcoffset, numbytes);
131 28 }
132
133 149628 void writeromdata_byte(int pcoffset, unsigned char indata, bool add_write)
134 {
135 149628 memcpy(const_cast<unsigned char*>(romdata) + pcoffset, &indata, 1);
136
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 149628 if(add_write)
137 140502 addromwrite(pcoffset, 1);
138 149628 }
139
140 128 void writeromdata_bytes(int pcoffset, unsigned char indata, int numbytes, bool add_write)
141 {
142
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 128 memset(const_cast<unsigned char*>(romdata) + pcoffset, indata, (size_t)numbytes);
143
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 128 if(add_write)
144 ✗ addromwrite(pcoffset, numbytes);
145 128 }
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
190 276 void handle_cleared_rats_tags()
191 {
192
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 304 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 }
196 276 cleared_rats_tag_blocks.reset();
197 276 }
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 &&
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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
218 552 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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 552 if(alt_start >= 0) start = std::max(start, alt_start);
221
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 552 if(!found_rats_tags_initialized) find_rats_tags();
222
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 143088 while (start+size<=end)
223 {
224
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 143050 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 72555 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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 140472 else if(!write_rats &&
243
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 172 (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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 140472 if (minalign)
250 {
251 6 start&=~minalign&0xFFFFFF;
252 6 start|=minalign&0xFFFFF8;
253 }
254 140472 bool bad=false;
255
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 8816844 for (int i=0;i<size;i++)
256 {
257
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 8815886 if (romdata[start+i]!=freespacebyte)
258 {
259 // TheBiob: fix freedata align freezing.
260
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 139514 if ((start & minalign) == 0x7FF8 && i < 8) i = 8;
261 139514 start+=i;
262
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 139514 if (!i) start++;//this could check for a rats tag instead, but somehow I think this will give better performance.
263 139514 bad=true;
264 139514 break;
265 }
266 }
267
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 140472 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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 958 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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 958 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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 958 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??
296 956 int snesstart = pctosnes(start);
297 // this gives the index of the first block whose snespos is >= start.
298
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 956 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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 956 if(writtenblock_pos > 0) writtenblock_pos--;
302
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 1464 for(; writtenblock_pos < writtenblocks.count; writtenblock_pos++)
303 {
304
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 962 auto & block = writtenblocks[writtenblock_pos];
305
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 962 if(snesstart < block.snesoffset+block.numbytes
306
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 454 && snesstart+size > block.snesoffset)
307 {
308 442 start = block.pcoffset + block.numbytes;
309 442 bad = true;
310 442 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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 520 if(block.snesoffset > snesstart+size) break;
314 }
315
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 956 if (bad) continue;
316
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 514 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');
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 486 writeromdata_byte(start+1, 'T');
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 486 writeromdata_byte(start+2, 'A');
324
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 486 writeromdata_byte(start+3, 'R');
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 486 writeromdata_byte(start+4, (unsigned char)(size&0xFF));
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 486 writeromdata_byte(start+5, (unsigned char)((size>>8)&0xFF));
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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));
329 500 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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 28 addromwrite(start, size);
336 28 return start;
337 }
338 }
339 38 return -1;
340 }
341
342 //This function finds a block of freespace. -1 means "no freespace found", anything else is a PC address.
343 //isforcode=false tells it to favor banks 40+, true tells it to avoid them entirely.
344 //It automatically adds a RATS tag.
345
346 514 int getpcfreespace(int size, int target_bank, bool autoexpand, bool respectbankborders, bool align, bool write_rats, int search_start)
347 {
348 // TODO: probably should error if specifying target_bank and align, or target_bank and respectbankborders
349
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 514 if (!size) {
350 // return a dummy valid address. 0x8000 should work in most mappers
351 ✗ if(target_bank >= 0) return snestopc(target_bank << 16 | 0x8000);
352 ✗ return 0;
353 }
354
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 514 if (size>0x10000 && (write_rats || respectbankborders)) return -1;
355 514 bool isforcode = target_bank == -2;
356
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 514 if(write_rats)
357 486 size+=8;
358
359 262 auto find_for_fixed_bank = [&](int banksize, bool force_high_half = false) {
360
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 10 if(!force_high_half && (target_bank & 0x40) == 0x40)
361
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 14 return trypcfreespace(snestopc(target_bank<<16), search_start, min(romlen, snestopc(target_bank<<16)+0x10000), size, banksize, 0, freespacebyte, write_rats);
362 else
363
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 16 return trypcfreespace(snestopc(target_bank<<16 | 0x8000), search_start, min(romlen, snestopc(target_bank<<16 | 0x8000)+0x8000), size, banksize, 0, freespacebyte, write_rats);
364 514 };
365
366
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 514 if (mapper==lorom)
367 {
368
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 500 if(target_bank >= 0) return find_for_fixed_bank(0x7fff);
369
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 494 if (size>0x8008 && respectbankborders) return -1;
370 513 rebootlorom:
371
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 532 if (romlen>0x200000 && !isforcode)
372 {
373
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 56 int pos=trypcfreespace(search_start >= 0 ? 0 : 0x200000-8, search_start, (romlen<0x400000)?romlen:0x400000, size,
374
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 28 respectbankborders?0x7FFF:0xFFFFFF, align?0x7FFF:(respectbankborders || size<32768)?0:0x7FFF, freespacebyte, write_rats);
375
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 28 if (pos>=0) return pos;
376 }
377
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 1002 int pos=trypcfreespace(search_start >= 0 ? 0 : 0x80000, search_start, (romlen<0x200000)?romlen:0x200000, size,
378
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 498 respectbankborders?0x7FFF:0xFFFFFF, align?0x7FFF:(respectbankborders || size<32768)?0:0x7FFF, freespacebyte, write_rats);
379
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 504 if (pos>=0) return pos;
380
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 38 if (autoexpand)
381 {
382 if(0);
383
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 38 else if (romlen==0x080000)
384 {
385
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 34 writeromdata_bytes(romlen, freespacebyte, 0x100000 - romlen, false);
386 34 romlen=0x100000;
387
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 34 writeromdata_byte(snestopc(0x00FFD7), 0x0A);
388 }
389
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 4 else if (romlen==0x100000)
390 {
391
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 2 writeromdata_bytes(romlen, freespacebyte, 0x200000 - romlen, false);
392 2 romlen=0x200000;
393
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 2 writeromdata_byte(snestopc(0x00FFD7), 0x0B);
394 }
395
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 2 else if (isforcode) return -1;//no point creating freespace that can't be used
396
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 2 else if (romlen==0x200000 || romlen==0x300000)
397 {
398
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 2 writeromdata_bytes(romlen, freespacebyte, 0x400000 - romlen, false);
399 2 romlen=0x400000;
400
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 2 writeromdata_byte(snestopc(0x00FFD7), 0x0C);
401 }
402 ✗ else return -1;
403 38 autoexpand=false;
404 38 goto rebootlorom;
405 }
406 }
407
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 14 if (mapper==hirom)
408 {
409
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 10 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
410
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 6 if (isforcode)
411 {
412
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 2 for(int i = 0x8000; i < min(romlen, 0x400000); i += 0x10000){
413
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 2 int space = trypcfreespace(i, search_start, min(i+0x7FFF, romlen), size, 0x7FFF, align?0xFFFF:0, freespacebyte, write_rats);
414
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 2 if(space != -1) return space;
415 }
416 ✗ return -1;
417 }
418
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 4 return trypcfreespace(0, search_start, romlen, size, respectbankborders?0xFFFF:0xFFFFFF, align?0xFFFF:0, freespacebyte, write_rats);
419 }
420
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 4 if (mapper==exlorom)
421 {
422 ✗ if(target_bank >= 0) return find_for_fixed_bank(0x7fff);
423 // RPG Hacker: Not really 100% sure what to do here, but I suppose this simplified code will do
424 // and we won't need all the complicated stuff from LoROM above?
425 ✗ if (isforcode)
426 {
427 ✗ trypcfreespace(0, search_start, min(romlen, 0x200000), size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
428 }
429 ✗ return trypcfreespace(0, search_start, romlen, size, 0x7FFF, align ? 0x7FFF : 0, freespacebyte, write_rats);
430 }
431
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 4 if (mapper==exhirom)
432 {
433 ✗ if(target_bank >= 0) return find_for_fixed_bank(0xffff);
434 ✗ if (isforcode)
435 {
436 ✗ for(int i = 0x8000; i < romlen && i < 0x400000; i += 0x10000){
437 ✗ int space = trypcfreespace(i, search_start, min(i+0x7FFF, romlen), size, 0x7FFF, align?0xFFFF:0, freespacebyte, write_rats);
438 ✗ if(space != -1) return space;
439 }
440 ✗ return -1;
441 }
442 ✗ return trypcfreespace(0, search_start, romlen, size, respectbankborders?0xFFFF:0xFFFFFF, align?0xFFFF:0, freespacebyte, write_rats);
443 }
444
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 4 if (mapper==sfxrom)
445 {
446
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 2 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
447
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 2 if (!isforcode) return -1;
448 // try not to overwrite smw stuff
449
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 2 return trypcfreespace(search_start >= 0 ? 0 : 0x80000, search_start, romlen, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
450 }
451
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 2 if (mapper==sa1rom)
452 {
453
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 2 if(target_bank >= 0) return find_for_fixed_bank(0xffff);
454 4 rebootsa1rom:
455 4 int nextbank=-1;
456
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 20 for (int i=0;i<8;i++)
457 {
458
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 18 if (i&2) continue;
459
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 10 if (sa1banks[i]+0x100000>romlen)
460 {
461
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 8 if (sa1banks[i]<=romlen && sa1banks[i]+0x100000>romlen) nextbank=sa1banks[i];
462 8 continue;
463 }
464
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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);
465
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 2 if (pos>=0) return pos;
466 }
467
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 2 if (autoexpand && nextbank>=0)
468 {
469 2 unsigned char x7FD7[]={0, 0x0A, 0x0B, 0x0C, 0x0C, 0x0D, 0x0D, 0x0D, 0x0D};
470
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 2 writeromdata_bytes(romlen, freespacebyte, nextbank + 0x100000 - romlen, false);
471 2 romlen=nextbank+0x100000;
472
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 2 writeromdata_byte(0x7FD7, x7FD7[romlen>>20]);
473 2 autoexpand=false;
474 2 goto rebootsa1rom;
475 }
476 }
477 ✗ if (mapper==bigsa1rom)
478 {
479 ✗ if(target_bank >= 0) return find_for_fixed_bank(0xffff);
480 ✗ if(!isforcode && romlen > 0x400000)
481 {
482 ✗ int pos=trypcfreespace(0x400000, search_start, romlen, size, 0xFFFF, align?0xFFFF:0, freespacebyte, write_rats);
483 ✗ if(pos>=0) return pos;
484 }
485 ✗ int pos=trypcfreespace(search_start >= 0 ? 0 : 0x080000, search_start, romlen, size, 0x7FFF, align?0x7FFF:0, freespacebyte, write_rats);
486 ✗ if(pos>=0) return pos;
487 }
488 ✗ return -1;
489 }
490
491 28 void WalkMetadata(int loc, void(*func)(int loc, char * name, int len, const unsigned char * contents))
492 {
493 28 int pcoff=snestopc(loc);
494
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 28 if (strncmp((const char*)romdata+pcoff-8, "STAR", 4)) return;
495 28 const unsigned char * metadata=romdata+pcoff;
496
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 34 while (is_upper(metadata[0]) && is_upper(metadata[1]) && is_upper(metadata[2]) && is_upper(metadata[3]))
497 {
498
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 10 if (!strncmp((const char*)metadata, "STOP", 4))
499 {
500 4 metadata=romdata+pcoff;
501
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 10 while (is_upper(metadata[0]) && is_upper(metadata[1]) && is_upper(metadata[2]) && is_upper(metadata[3]))
502 {
503
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 10 if (!strncmp((const char*)metadata, "STOP", 4))
504 {
505 4 break;
506 }
507 6 func(pctosnes((int)(metadata-romdata)), (char*)const_cast<unsigned char*>(metadata), metadata[4], metadata+5);
508 6 metadata+=5+metadata[4];
509 }
510 4 break;
511 }
512 6 metadata+=5+metadata[4];
513 }
514 }
515
516 514 int getsnesfreespace(int size, int target_bank, bool autoexpand, bool respectbankborders, bool align, bool write_rats, int search_start)
517 {
518 514 int pcfree = getpcfreespace(size, target_bank, autoexpand, respectbankborders, align, write_rats, snestopc(search_start));
519 514 int snesfree = pctosnes(pcfree);
520
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 514 if(snesfree == -1) return -1;
521 514 bool isforcode = target_bank == -2;
522 // not sure if this is ever a concern for other mappers...
523
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 514 if(isforcode && (mapper == hirom || mapper == exhirom)) {
524 2 snesfree = snesfree & ~0x400000;
525 // maybe this should throw an internal error or something instead lol
526
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 2 if((snesfree&0x8000) != 0x8000) return -1;
527 }
528 514 return snesfree;
529 }
530
531 3 bool openrom(const char * filename, bool confirm)
532 {
533 3 closerom();
534 3 thisfile = open_file(filename, FileOpenMode_ReadWrite);
535
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 3 if (thisfile == InvalidFileHandle)
536 {
537 ✗ throw_err_null(pass, err_open_rom_failed);
538 ✗ return false;
539 }
540 3 header=false;
541
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 3 if (strlen(filename)>4)
542 {
543
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 3 const char * fnameend=strchr(filename, '\0')-4;
544
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 3 header=(!stricmp(fnameend, ".smc"));
545 }
546
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 3 romlen=(int)get_file_size(thisfile)-(header*512);
547
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 3 if (romlen<0) romlen=0;
548
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 3 set_file_pos(thisfile, header*512);
549 3 romdata=(unsigned char*)malloc(sizeof(unsigned char)*16*1024*1024);
550 3 int truelen=(int)read_file(thisfile, (void*)romdata, (uint32_t)romlen);
551
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 3 if (truelen!=romlen)
552 {
553 ✗ free(const_cast<unsigned char*>(romdata));
554 ✗ throw_err_null(pass, err_open_rom_failed);
555 ✗ return false;
556 }
557
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 3 memset(const_cast<unsigned char*>(romdata)+romlen, 0x00, (size_t)(16*1024*1024-romlen));
558
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 3 if (confirm && snestopc(0x00FFC0)+21<(int)romlen && strncmp((const char*)romdata+snestopc(0x00FFC0), "SUPER MARIOWORLD ", 21))
559 {
560 ✗ closerom(false);
561 ✗ if(header) throw_err_null(pass, err_open_rom_not_smw_extension);
562 ✗ else throw_err_null(pass, err_open_rom_not_smw_header);
563 ✗ return false;
564 }
565
566 3 romdata_r=(unsigned char*)malloc((size_t)romlen);
567 3 romlen_r=romlen;
568
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 3 memcpy((void*)romdata_r, romdata, (size_t)romlen);//recently allocated, dead
569
570 3 return true;
571 }
572
573 6 uint32_t closerom(bool save)
574 {
575 6 uint32_t romCrc = 0;
576
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 6 if (thisfile != InvalidFileHandle && save && romlen)
577 {
578
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 3 set_file_pos(thisfile, header*512);
579 3 write_file(thisfile, romdata, (uint32_t)romlen);
580
581 // do a quick re-read of the header, and include that in the crc32 calculation if necessary
582 {
583
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 3 uint8_t* filedata = (uint8_t*)malloc(sizeof(uint8_t) * (romlen + header * 512));
584
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 3 if (header)
585 {
586 ✗ set_file_pos(thisfile, 0u);
587 ✗ read_file(thisfile, filedata, 512);
588 }
589
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 3 memcpy(filedata + (header * 512), romdata, sizeof(uint8_t) * (size_t)romlen);
590
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 3 romCrc = crc32(filedata, (unsigned int)(romlen + header * 512));
591 3 free(filedata);
592 }
593 }
594
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 6 if (thisfile != InvalidFileHandle) close_file(thisfile);
595
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 6 if (romdata) free(const_cast<unsigned char*>(romdata));
596
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 6 if (romdata_r) free(const_cast<unsigned char*>(romdata_r));
597 6 thisfile= InvalidFileHandle;
598 6 romdata= nullptr;
599 6 romdata_r = nullptr;
600 6 romlen=0;
601 6 return romCrc;
602 }
603
604 28 static unsigned int getchecksum()
605 {
606 28 unsigned int checksum=0;
607
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 28 if((romlen & (romlen-1)) == 0)
608 {
609 // romlen is a power of 2, just add up all the bytes
610
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 131107 for (int i=0;i<romlen;i++) checksum+=romdata[i];
611 }
612 else
613 {
614 // assume romlen is the sum of 2 powers of 2 - i haven't seen any real rom that isn't,
615 // and if you make such a rom, fixing its checksum is your problem.
616 5 int firstpart = bitround(romlen) >> 1;
617 5 int secondpart = romlen - firstpart;
618
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 5 int repeatcount = firstpart / secondpart;
619 5 unsigned int secondpart_sum = 0;
620
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 65551 for(int i = 0; i < firstpart; i++) checksum += romdata[i];
621
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 14 for(int i = firstpart; i < romlen; i++) secondpart_sum += romdata[i];
622 5 checksum += secondpart_sum * repeatcount;
623 }
624 28 return checksum&0xFFFF;
625 }
626
627 28 void fixchecksum()
628 {
629 // randomdude999: clear out checksum bytes before recalculating checksum, this should make it correct on roms that don't have a checksum yet
630 28 writeromdata(snestopc(0x00FFDC), "\xFF\xFF\0\0", 4);
631 28 int checksum=(int)getchecksum();
632 28 writeromdata_byte(snestopc(0x00FFDE), (unsigned char)(checksum&255));
633 28 writeromdata_byte(snestopc(0x00FFDF), (unsigned char)((checksum>>8)&255));
634 28 writeromdata_byte(snestopc(0x00FFDC), (unsigned char)((checksum&255)^255));
635 28 writeromdata_byte(snestopc(0x00FFDD), (unsigned char)(((checksum>>8)&255)^255));
636 28 }
637