3 * (c) Copyright Dave, 2004
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4 * (C) notaz, 2006-2010
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6 * This work is licensed under the terms of MAME license.
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7 * See COPYING file in the top-level directory.
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10 #include "pico_int.h"
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11 #include "../cpu/debug.h"
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12 #include "../unzip/unzip.h"
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16 static int rom_alloc_size;
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17 static const char *rom_exts[] = { "bin", "gen", "smd", "iso", "sms", "gg", "sg" };
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19 void (*PicoCartUnloadHook)(void);
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20 void (*PicoCartMemSetup)(void);
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22 void (*PicoCartLoadProgressCB)(int percent) = NULL;
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23 void (*PicoCDLoadProgressCB)(const char *fname, int percent) = NULL; // handled in Pico/cd/cd_file.c
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27 static void PicoCartDetect(const char *carthw_cfg);
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30 typedef struct _cso_struct
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32 unsigned char in_buff[2*2048];
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33 unsigned char out_buff[2048];
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36 unsigned int unused;
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37 unsigned int total_bytes;
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38 unsigned int total_bytes_high; // ignored here
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39 unsigned int block_size; // 10h
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41 unsigned char align;
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42 unsigned char reserved[2];
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44 unsigned int fpos_in; // input file read pointer
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45 unsigned int fpos_out; // pos in virtual decompressed file
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46 int block_in_buff; // block which we have read in in_buff
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52 static int uncompress_buf(void *dest, int destLen, void *source, int sourceLen)
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57 stream.next_in = (Bytef*)source;
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58 stream.avail_in = (uInt)sourceLen;
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59 stream.next_out = dest;
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60 stream.avail_out = (uInt)destLen;
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62 stream.zalloc = NULL;
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63 stream.zfree = NULL;
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65 err = inflateInit2(&stream, -15);
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66 if (err != Z_OK) return err;
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68 err = inflate(&stream, Z_FINISH);
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69 if (err != Z_STREAM_END) {
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70 inflateEnd(&stream);
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73 //*destLen = stream.total_out;
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75 return inflateEnd(&stream);
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78 static const char *get_ext(const char *path)
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81 if (strlen(path) < 4)
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82 return ""; // no ext
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84 // allow 2 or 3 char extensions for now
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85 ext = path + strlen(path) - 2;
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86 if (ext[-1] != '.') ext--;
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95 struct zipent *entry;
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97 unsigned char inbuf[16384];
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102 pm_file *pm_open(const char *path)
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104 pm_file *file = NULL;
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111 ext = get_ext(path);
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113 if (strcasecmp(ext, "zip") == 0)
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115 struct zip_file *zfile = NULL;
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116 struct zipent *zipentry;
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120 zipfile = openzip(path);
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121 if (zipfile != NULL)
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123 /* search for suitable file (right extension or large enough file) */
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124 while ((zipentry = readzip(zipfile)) != NULL)
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126 ext = get_ext(zipentry->name);
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128 if (zipentry->uncompressed_size >= 32*1024)
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129 goto found_rom_zip;
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131 for (i = 0; i < sizeof(rom_exts)/sizeof(rom_exts[0]); i++)
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132 if (strcasecmp(ext, rom_exts[i]) == 0)
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133 goto found_rom_zip;
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136 /* zipfile given, but nothing found suitable for us inside */
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140 zfile = calloc(1, sizeof(*zfile));
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143 ret = seekcompresszip(zipfile, zipentry);
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146 ret = inflateInit2(&zfile->stream, -15);
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148 elprintf(EL_STATUS, "zip: inflateInit2 %d", ret);
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151 zfile->zip = zipfile;
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152 zfile->entry = zipentry;
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153 zfile->start = ftell(zipfile->fp);
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154 zfile->file.file = zfile;
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155 zfile->file.size = zipentry->uncompressed_size;
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156 zfile->file.type = PMT_ZIP;
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157 strncpy(zfile->file.ext, ext, sizeof(zfile->file.ext) - 1);
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158 return &zfile->file;
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168 if (strcasecmp(ext, "cso") == 0)
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170 cso_struct *cso = NULL, *tmp = NULL;
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172 f = fopen(path, "rb");
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177 /* we use our own buffering */
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178 setvbuf(f, NULL, _IONBF, 0);
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181 cso = malloc(sizeof(*cso));
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185 if (fread(&cso->header, 1, sizeof(cso->header), f) != sizeof(cso->header))
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188 if (strncmp(cso->header.magic, "CISO", 4) != 0) {
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189 elprintf(EL_STATUS, "cso: bad header");
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193 if (cso->header.block_size != 2048) {
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194 elprintf(EL_STATUS, "cso: bad block size (%u)", cso->header.block_size);
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198 size = ((cso->header.total_bytes >> 11) + 1)*4 + sizeof(*cso);
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199 tmp = realloc(cso, size);
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203 elprintf(EL_STATUS, "allocated %i bytes for CSO struct", size);
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205 size -= sizeof(*cso); // index size
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206 if (fread(cso->index, 1, size, f) != size) {
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207 elprintf(EL_STATUS, "cso: premature EOF");
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212 cso->fpos_in = ftell(f);
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214 cso->block_in_buff = -1;
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215 file = calloc(1, sizeof(*file));
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216 if (file == NULL) goto cso_failed;
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219 file->size = cso->header.total_bytes;
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220 file->type = PMT_CSO;
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224 if (cso != NULL) free(cso);
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225 if (f != NULL) fclose(f);
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229 /* not a zip, treat as uncompressed file */
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230 f = fopen(path, "rb");
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231 if (f == NULL) return NULL;
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233 file = calloc(1, sizeof(*file));
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234 if (file == NULL) {
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238 fseek(f, 0, SEEK_END);
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240 file->param = NULL;
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241 file->size = ftell(f);
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242 file->type = PMT_UNCOMPRESSED;
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243 strncpy(file->ext, ext, sizeof(file->ext) - 1);
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244 fseek(f, 0, SEEK_SET);
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247 if (file->size > 0x400000)
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248 /* we use our own buffering */
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249 setvbuf(f, NULL, _IONBF, 0);
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255 size_t pm_read(void *ptr, size_t bytes, pm_file *stream)
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259 if (stream->type == PMT_UNCOMPRESSED)
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261 ret = fread(ptr, 1, bytes, stream->file);
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264 else if (stream->type == PMT_ZIP)
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266 struct zip_file *z = stream->file;
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268 if (z->entry->compression_method == 0) {
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269 int ret = fread(ptr, 1, bytes, z->zip->fp);
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274 z->stream.next_out = ptr;
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275 z->stream.avail_out = bytes;
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276 while (z->stream.avail_out != 0) {
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277 if (z->stream.avail_in == 0) {
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278 z->stream.avail_in = fread(z->inbuf, 1, sizeof(z->inbuf), z->zip->fp);
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279 if (z->stream.avail_in == 0)
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281 z->stream.next_in = z->inbuf;
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283 ret = inflate(&z->stream, Z_NO_FLUSH);
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284 if (ret == Z_STREAM_END)
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287 elprintf(EL_STATUS, "zip: inflate: %d", ret);
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291 z->pos += bytes - z->stream.avail_out;
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292 return bytes - z->stream.avail_out;
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295 else if (stream->type == PMT_CSO)
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297 cso_struct *cso = stream->param;
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298 int read_pos, read_len, out_offs, rret;
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299 int block = cso->fpos_out >> 11;
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300 int index = cso->index[block];
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301 int index_end = cso->index[block+1];
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302 unsigned char *out = ptr, *tmp_dst;
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307 out_offs = cso->fpos_out&0x7ff;
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308 if (out_offs == 0 && bytes >= 2048)
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310 else tmp_dst = cso->out_buff;
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312 read_pos = (index&0x7fffffff) << cso->header.align;
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315 if (read_pos != cso->fpos_in)
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316 fseek(stream->file, read_pos, SEEK_SET);
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317 rret = fread(tmp_dst, 1, 2048, stream->file);
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318 cso->fpos_in = read_pos + rret;
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319 if (rret != 2048) break;
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321 read_len = (((index_end&0x7fffffff) << cso->header.align) - read_pos) & 0xfff;
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322 if (block != cso->block_in_buff)
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324 if (read_pos != cso->fpos_in)
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325 fseek(stream->file, read_pos, SEEK_SET);
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326 rret = fread(cso->in_buff, 1, read_len, stream->file);
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327 cso->fpos_in = read_pos + rret;
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328 if (rret != read_len) {
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329 elprintf(EL_STATUS, "cso: read failed @ %08x", read_pos);
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332 cso->block_in_buff = block;
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334 rret = uncompress_buf(tmp_dst, 2048, cso->in_buff, read_len);
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336 elprintf(EL_STATUS, "cso: uncompress failed @ %08x with %i", read_pos, rret);
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342 if (out_offs != 0 || bytes < 2048) {
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343 //elprintf(EL_STATUS, "cso: unaligned/nonfull @ %08x, offs=%i, len=%u", cso->fpos_out, out_offs, bytes);
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344 if (bytes < rret) rret = bytes;
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345 if (2048 - out_offs < rret) rret = 2048 - out_offs;
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346 memcpy(out, tmp_dst + out_offs, rret);
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350 cso->fpos_out += rret;
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354 index_end = cso->index[block+1];
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363 int pm_seek(pm_file *stream, long offset, int whence)
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365 if (stream->type == PMT_UNCOMPRESSED)
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367 fseek(stream->file, offset, whence);
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368 return ftell(stream->file);
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371 else if (stream->type == PMT_ZIP)
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373 struct zip_file *z = stream->file;
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374 unsigned int pos = z->pos;
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379 case SEEK_CUR: pos += offset; break;
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380 case SEEK_SET: pos = offset; break;
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381 case SEEK_END: pos = stream->size - offset; break;
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383 if (z->entry->compression_method == 0) {
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384 ret = fseek(z->zip->fp, z->start + pos, SEEK_SET);
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386 return (z->pos = pos);
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389 offset = pos - z->pos;
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390 if (pos < z->pos) {
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391 // full decompress from the start
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392 fseek(z->zip->fp, z->start, SEEK_SET);
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393 z->stream.avail_in = 0;
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394 z->stream.next_in = z->inbuf;
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395 inflateReset(&z->stream);
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400 if (PicoMessage != NULL && offset > 4 * 1024 * 1024)
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401 PicoMessage("Decompressing data...");
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403 while (offset > 0) {
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404 char buf[16 * 1024];
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405 size_t l = offset > sizeof(buf) ? sizeof(buf) : offset;
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406 ret = pm_read(buf, l, stream);
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414 else if (stream->type == PMT_CSO)
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416 cso_struct *cso = stream->param;
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419 case SEEK_CUR: cso->fpos_out += offset; break;
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420 case SEEK_SET: cso->fpos_out = offset; break;
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421 case SEEK_END: cso->fpos_out = cso->header.total_bytes - offset; break;
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423 return cso->fpos_out;
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429 int pm_close(pm_file *fp)
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433 if (fp == NULL) return EOF;
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435 if (fp->type == PMT_UNCOMPRESSED)
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440 else if (fp->type == PMT_ZIP)
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442 struct zip_file *z = fp->file;
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443 inflateEnd(&z->stream);
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447 else if (fp->type == PMT_CSO)
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459 // byteswap, data needs to be int aligned, src can match dst
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460 void Byteswap(void *dst, const void *src, int len)
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462 const unsigned int *ps = src;
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463 unsigned int *pd = dst;
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470 for (i = 0; i < len / 4; i++) {
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471 unsigned int t = ps[i];
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472 pd[i] = ((t & m) << 8) | ((t & ~m) >> 8);
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476 // Interleve a 16k block and byteswap
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477 static int InterleveBlock(unsigned char *dest,unsigned char *src)
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480 for (i=0;i<0x2000;i++) dest[(i<<1) ]=src[ i]; // Odd
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481 for (i=0;i<0x2000;i++) dest[(i<<1)+1]=src[0x2000+i]; // Even
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485 // Decode a SMD file
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486 static int DecodeSmd(unsigned char *data,int len)
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488 unsigned char *temp=NULL;
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491 temp=(unsigned char *)malloc(0x4000);
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492 if (temp==NULL) return 1;
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493 memset(temp,0,0x4000);
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495 // Interleve each 16k block and shift down by 0x200:
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496 for (i=0; i+0x4200<=len; i+=0x4000)
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498 InterleveBlock(temp,data+0x200+i); // Interleve 16k to temporary buffer
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499 memcpy(data+i,temp,0x4000); // Copy back in
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506 static unsigned char *PicoCartAlloc(int filesize, int is_sms)
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508 unsigned char *rom;
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511 // make size power of 2 for easier banking handling
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512 int s = 0, tmp = filesize;
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513 while ((tmp >>= 1) != 0)
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515 if (filesize > (1 << s))
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517 rom_alloc_size = 1 << s;
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518 // be sure we can cover all address space
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519 if (rom_alloc_size < 0x10000)
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520 rom_alloc_size = 0x10000;
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523 // make alloc size at least sizeof(mcd_state),
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524 // in case we want to switch to CD mode
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525 if (filesize < sizeof(mcd_state))
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526 filesize = sizeof(mcd_state);
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528 // align to 512K for memhandlers
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529 rom_alloc_size = (filesize + 0x7ffff) & ~0x7ffff;
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532 if (rom_alloc_size - filesize < 4)
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533 rom_alloc_size += 4; // padding for out-of-bound exec protection
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535 // Allocate space for the rom plus padding
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536 // use special address for 32x dynarec
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537 rom = plat_mmap(0x02000000, rom_alloc_size, 0, 0);
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541 int PicoCartLoad(pm_file *f,unsigned char **prom,unsigned int *psize,int is_sms)
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543 unsigned char *rom;
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544 int size, bytes_read;
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550 if (size <= 0) return 1;
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551 size = (size+3)&~3; // Round up to a multiple of 4
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553 // Allocate space for the rom plus padding
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554 rom = PicoCartAlloc(size, is_sms);
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556 elprintf(EL_STATUS, "out of memory (wanted %i)", size);
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560 if (PicoCartLoadProgressCB != NULL)
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562 // read ROM in blocks, just for fun
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564 unsigned char *p = rom;
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568 int todo = size - bytes_read;
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569 if (todo > 256*1024) todo = 256*1024;
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570 ret = pm_read(p,todo,f);
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573 PicoCartLoadProgressCB(bytes_read * 100 / size);
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578 bytes_read = pm_read(rom,size,f); // Load up the rom
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579 if (bytes_read <= 0) {
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580 elprintf(EL_STATUS, "read failed");
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581 plat_munmap(rom, rom_alloc_size);
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587 // maybe we are loading MegaCD BIOS?
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588 if (!(PicoAHW & PAHW_MCD) && size == 0x20000 && (!strncmp((char *)rom+0x124, "BOOT", 4) ||
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589 !strncmp((char *)rom+0x128, "BOOT", 4))) {
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590 PicoAHW |= PAHW_MCD;
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594 if (size >= 0x4200 && (size&0x3fff) == 0x200 &&
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595 ((rom[0x2280] == 'S' && rom[0x280] == 'E') || (rom[0x280] == 'S' && rom[0x2281] == 'E'))) {
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596 elprintf(EL_STATUS, "SMD format detected.");
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597 DecodeSmd(rom,size); size-=0x200; // Decode and byteswap SMD
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599 else Byteswap(rom, rom, size); // Just byteswap
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603 if (size >= 0x4200 && (size&0x3fff) == 0x200) {
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604 elprintf(EL_STATUS, "SMD format detected.");
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605 // at least here it's not interleaved
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607 memmove(rom, rom + 0x200, size);
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611 if (prom) *prom = rom;
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612 if (psize) *psize = size;
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617 // Insert a cartridge:
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618 int PicoCartInsert(unsigned char *rom, unsigned int romsize, const char *carthw_cfg)
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620 // notaz: add a 68k "jump one op back" opcode to the end of ROM.
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621 // This will hang the emu, but will prevent nasty crashes.
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622 // note: 4 bytes are padded to every ROM
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624 *(unsigned long *)(rom+romsize) = 0xFFFE4EFA; // 4EFA FFFE byteswapped
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627 Pico.romsize=romsize;
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634 if (PicoCartUnloadHook != NULL) {
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635 PicoCartUnloadHook();
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636 PicoCartUnloadHook = NULL;
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640 PicoAHW &= PAHW_MCD|PAHW_SMS;
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642 PicoCartMemSetup = NULL;
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643 PicoDmaHook = NULL;
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644 PicoResetHook = NULL;
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645 PicoLineHook = NULL;
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646 PicoLoadStateHook = NULL;
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647 carthw_chunks = NULL;
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649 if (!(PicoAHW & (PAHW_MCD|PAHW_SMS)))
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650 PicoCartDetect(carthw_cfg);
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652 // setup correct memory map for loaded ROM
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655 elprintf(EL_STATUS|EL_ANOMALY, "starting in unknown hw configuration: %x", PicoAHW);
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657 case PAHW_SVP: PicoMemSetup(); break;
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658 case PAHW_MCD: PicoMemSetupCD(); break;
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659 case PAHW_PICO: PicoMemSetupPico(); break;
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660 case PAHW_SMS: PicoMemSetupMS(); break;
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663 if (PicoCartMemSetup != NULL)
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664 PicoCartMemSetup();
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666 if (PicoAHW & PAHW_SMS)
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671 PicoGameLoaded = 1;
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675 int PicoCartResize(int newsize)
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677 void *tmp = plat_mremap(Pico.rom, rom_alloc_size, newsize);
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682 rom_alloc_size = newsize;
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686 void PicoCartUnload(void)
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688 if (PicoCartUnloadHook != NULL) {
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689 PicoCartUnloadHook();
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690 PicoCartUnloadHook = NULL;
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693 if (PicoAHW & PAHW_32X)
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696 if (Pico.rom != NULL) {
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697 SekFinishIdleDet();
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698 plat_munmap(Pico.rom, rom_alloc_size);
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701 PicoGameLoaded = 0;
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704 static unsigned int rom_crc32(void)
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707 elprintf(EL_STATUS, "caclulating CRC32..");
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709 // have to unbyteswap for calculation..
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710 Byteswap(Pico.rom, Pico.rom, Pico.romsize);
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711 crc = crc32(0, Pico.rom, Pico.romsize);
\r
712 Byteswap(Pico.rom, Pico.rom, Pico.romsize);
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716 static int rom_strcmp(int rom_offset, const char *s1)
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718 int i, len = strlen(s1);
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719 const char *s_rom = (const char *)Pico.rom;
\r
720 if (rom_offset + len > Pico.romsize)
\r
722 for (i = 0; i < len; i++)
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723 if (s1[i] != s_rom[(i + rom_offset) ^ 1])
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728 static unsigned int rom_read32(int addr)
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730 unsigned short *m = (unsigned short *)(Pico.rom + addr);
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731 return (m[0] << 16) | m[1];
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734 static char *sskip(char *s)
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736 while (*s && isspace_(*s))
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741 static void rstrip(char *s)
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744 for (p = s + strlen(s) - 1; p >= s; p--)
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749 static int parse_3_vals(char *p, int *val0, int *val1, int *val2)
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752 *val0 = strtoul(p, &r, 0);
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758 *val1 = strtoul(p, &r, 0);
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764 *val2 = strtoul(p, &r, 0);
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773 static int is_expr(const char *expr, char **pr)
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775 int len = strlen(expr);
\r
778 if (strncmp(expr, p, len) != 0)
\r
780 p = sskip(p + len);
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782 return 0; // wrong or malformed
\r
784 *pr = sskip(p + 1);
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788 #include "carthw_cfg.c"
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790 static void parse_carthw(const char *carthw_cfg, int *fill_sram)
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792 int line = 0, any_checks_passed = 0, skip_sect = 0;
\r
793 const char *s, *builtin = builtin_carthw_cfg;
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794 int tmp, rom_crc = 0;
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795 char buff[256], *p, *r;
\r
798 f = fopen(carthw_cfg, "r");
\r
800 f = fopen("pico/carthw.cfg", "r");
\r
802 elprintf(EL_STATUS, "couldn't open carthw.cfg!");
\r
807 p = fgets(buff, sizeof(buff), f);
\r
814 for (s = builtin; *s != 0 && *s != '\n'; s++)
\r
819 if (tmp > sizeof(buff) - 1)
\r
820 tmp = sizeof(buff) - 1;
\r
821 memcpy(buff, builtin, tmp);
\r
829 if (*p == 0 || *p == '#')
\r
833 any_checks_passed = 0;
\r
841 /* look for checks */
\r
842 if (is_expr("check_str", &p))
\r
845 offs = strtoul(p, &r, 0);
\r
846 if (offs < 0 || offs > Pico.romsize) {
\r
847 elprintf(EL_STATUS, "carthw:%d: check_str offs out of range: %d\n", line, offs);
\r
857 r = strchr(p, '"');
\r
862 if (rom_strcmp(offs, p) == 0)
\r
863 any_checks_passed = 1;
\r
868 else if (is_expr("check_size_gt", &p))
\r
871 size = strtoul(p, &r, 0);
\r
872 if (r == p || size < 0)
\r
875 if (Pico.romsize > size)
\r
876 any_checks_passed = 1;
\r
881 else if (is_expr("check_csum", &p))
\r
884 csum = strtoul(p, &r, 0);
\r
885 if (r == p || (csum & 0xffff0000))
\r
888 if (csum == (rom_read32(0x18c) & 0xffff))
\r
889 any_checks_passed = 1;
\r
894 else if (is_expr("check_crc32", &p))
\r
897 crc = strtoul(p, &r, 0);
\r
902 rom_crc = rom_crc32();
\r
903 if (crc == rom_crc)
\r
904 any_checks_passed = 1;
\r
910 /* now time for actions */
\r
911 if (is_expr("hw", &p)) {
\r
912 if (!any_checks_passed)
\r
916 if (strcmp(p, "svp") == 0)
\r
918 else if (strcmp(p, "pico") == 0)
\r
920 else if (strcmp(p, "prot") == 0)
\r
921 carthw_sprot_startup();
\r
922 else if (strcmp(p, "ssf2_mapper") == 0)
\r
923 carthw_ssf2_startup();
\r
924 else if (strcmp(p, "x_in_1_mapper") == 0)
\r
925 carthw_Xin1_startup();
\r
926 else if (strcmp(p, "realtec_mapper") == 0)
\r
927 carthw_realtec_startup();
\r
928 else if (strcmp(p, "radica_mapper") == 0)
\r
929 carthw_radica_startup();
\r
930 else if (strcmp(p, "piersolar_mapper") == 0)
\r
931 carthw_pier_startup();
\r
932 else if (strcmp(p, "prot_lk3") == 0)
\r
933 carthw_prot_lk3_startup();
\r
935 elprintf(EL_STATUS, "carthw:%d: unsupported mapper: %s", line, p);
\r
940 if (is_expr("sram_range", &p)) {
\r
943 if (!any_checks_passed)
\r
947 start = strtoul(p, &r, 0);
\r
954 end = strtoul(p, &r, 0);
\r
957 if (((start | end) & 0xff000000) || start > end) {
\r
958 elprintf(EL_STATUS, "carthw:%d: bad sram_range: %08x - %08x", line, start, end);
\r
961 SRam.start = start;
\r
965 else if (is_expr("prop", &p)) {
\r
966 if (!any_checks_passed)
\r
970 if (strcmp(p, "no_sram") == 0)
\r
971 SRam.flags &= ~SRF_ENABLED;
\r
972 else if (strcmp(p, "no_eeprom") == 0)
\r
973 SRam.flags &= ~SRF_EEPROM;
\r
974 else if (strcmp(p, "filled_sram") == 0)
\r
976 else if (strcmp(p, "force_6btn") == 0)
\r
977 PicoQuirks |= PQUIRK_FORCE_6BTN;
\r
979 elprintf(EL_STATUS, "carthw:%d: unsupported prop: %s", line, p);
\r
982 elprintf(EL_STATUS, "game prop: %s", p);
\r
985 else if (is_expr("eeprom_type", &p)) {
\r
987 if (!any_checks_passed)
\r
991 type = strtoul(p, &r, 0);
\r
992 if (r == p || type < 0)
\r
994 SRam.eeprom_type = type;
\r
995 SRam.flags |= SRF_EEPROM;
\r
998 else if (is_expr("eeprom_lines", &p)) {
\r
999 int scl, sda_in, sda_out;
\r
1000 if (!any_checks_passed)
\r
1004 if (!parse_3_vals(p, &scl, &sda_in, &sda_out))
\r
1006 if (scl < 0 || scl > 15 || sda_in < 0 || sda_in > 15 ||
\r
1007 sda_out < 0 || sda_out > 15)
\r
1010 SRam.eeprom_bit_cl = scl;
\r
1011 SRam.eeprom_bit_in = sda_in;
\r
1012 SRam.eeprom_bit_out= sda_out;
\r
1015 else if ((tmp = is_expr("prot_ro_value16", &p)) || is_expr("prot_rw_value16", &p)) {
\r
1016 int addr, mask, val;
\r
1017 if (!any_checks_passed)
\r
1021 if (!parse_3_vals(p, &addr, &mask, &val))
\r
1024 carthw_sprot_new_location(addr, mask, val, tmp ? 1 : 0);
\r
1030 elprintf(EL_STATUS, "carthw:%d: unrecognized expression: %s", line, buff);
\r
1036 elprintf(EL_STATUS, "carthw:%d: command without any checks before it: %s", line, buff);
\r
1046 * various cart-specific things, which can't be handled by generic code
\r
1048 static void PicoCartDetect(const char *carthw_cfg)
\r
1050 int fill_sram = 0;
\r
1052 memset(&SRam, 0, sizeof(SRam));
\r
1053 if (Pico.rom[0x1B1] == 'R' && Pico.rom[0x1B0] == 'A')
\r
1055 SRam.start = rom_read32(0x1B4) & ~0xff000001; // align
\r
1056 SRam.end = (rom_read32(0x1B8) & ~0xff000000) | 1;
\r
1057 if (Pico.rom[0x1B2] & 0x40)
\r
1059 SRam.flags |= SRF_EEPROM;
\r
1060 SRam.flags |= SRF_ENABLED;
\r
1062 if (SRam.end == 0 || SRam.start > SRam.end)
\r
1064 // some games may have bad headers, like S&K and Sonic3
\r
1065 // note: majority games use 0x200000 as starting address, but there are some which
\r
1066 // use something else (0x300000 by HardBall '95). Luckily they have good headers.
\r
1067 SRam.start = 0x200000;
\r
1068 SRam.end = 0x203FFF;
\r
1069 SRam.flags |= SRF_ENABLED;
\r
1072 // set EEPROM defaults, in case it gets detected
\r
1073 SRam.eeprom_type = 0; // 7bit (24C01)
\r
1074 SRam.eeprom_bit_cl = 1;
\r
1075 SRam.eeprom_bit_in = 0;
\r
1076 SRam.eeprom_bit_out= 0;
\r
1078 if (carthw_cfg != NULL)
\r
1079 parse_carthw(carthw_cfg, &fill_sram);
\r
1081 if (SRam.flags & SRF_ENABLED)
\r
1083 if (SRam.flags & SRF_EEPROM)
\r
1084 SRam.size = 0x2000;
\r
1086 SRam.size = SRam.end - SRam.start + 1;
\r
1088 SRam.data = calloc(SRam.size, 1);
\r
1089 if (SRam.data == NULL)
\r
1090 SRam.flags &= ~SRF_ENABLED;
\r
1092 if (SRam.eeprom_type == 1) // 1 == 0 in PD EEPROM code
\r
1093 SRam.eeprom_type = 0;
\r
1096 if ((SRam.flags & SRF_ENABLED) && fill_sram)
\r
1098 elprintf(EL_STATUS, "SRAM fill");
\r
1099 memset(SRam.data, 0xff, SRam.size);
\r
1102 // Unusual region 'code'
\r
1103 if (rom_strcmp(0x1f0, "EUROPE") == 0 || rom_strcmp(0x1f0, "Europe") == 0)
\r
1104 *(int *) (Pico.rom + 0x1f0) = 0x20204520;
\r
1107 // vim:shiftwidth=2:expandtab
\r