| 1 | // This is part of Pico Library\r |
| 2 | \r |
| 3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
| 4 | // (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r |
| 5 | // Free for non-commercial use.\r |
| 6 | \r |
| 7 | // For commercial use, separate licencing terms must be obtained.\r |
| 8 | \r |
| 9 | \r |
| 10 | #include "PicoInt.h"\r |
| 11 | #include "../zlib/zlib.h"\r |
| 12 | #include "../unzip/unzip.h"\r |
| 13 | #include "../unzip/unzip_stream.h"\r |
| 14 | \r |
| 15 | \r |
| 16 | static char *rom_exts[] = { "bin", "gen", "smd", "iso" };\r |
| 17 | \r |
| 18 | \r |
| 19 | pm_file *pm_open(const char *path)\r |
| 20 | {\r |
| 21 | pm_file *file = NULL;\r |
| 22 | const char *ext;\r |
| 23 | FILE *f;\r |
| 24 | \r |
| 25 | if (path == NULL) return NULL;\r |
| 26 | \r |
| 27 | if (strlen(path) < 5) ext = NULL; // no ext\r |
| 28 | else ext = path + strlen(path) - 3;\r |
| 29 | \r |
| 30 | if (ext && strcasecmp(ext, "zip") == 0)\r |
| 31 | {\r |
| 32 | struct zipent *zipentry;\r |
| 33 | gzFile gzf = NULL;\r |
| 34 | ZIP *zipfile;\r |
| 35 | int i;\r |
| 36 | \r |
| 37 | zipfile = openzip(path);\r |
| 38 | \r |
| 39 | if (zipfile != NULL)\r |
| 40 | {\r |
| 41 | /* search for suitable file (right extension or large enough file) */\r |
| 42 | while ((zipentry = readzip(zipfile)) != NULL)\r |
| 43 | {\r |
| 44 | if (zipentry->uncompressed_size >= 128*1024) goto found_rom_zip;\r |
| 45 | if (strlen(zipentry->name) < 5) continue;\r |
| 46 | \r |
| 47 | ext = zipentry->name+strlen(zipentry->name)-3;\r |
| 48 | for (i = 0; i < sizeof(rom_exts)/sizeof(rom_exts[0]); i++)\r |
| 49 | if (!strcasecmp(ext, rom_exts[i]) == 0) goto found_rom_zip;\r |
| 50 | }\r |
| 51 | \r |
| 52 | /* zipfile given, but nothing found suitable for us inside */\r |
| 53 | goto zip_failed;\r |
| 54 | \r |
| 55 | found_rom_zip:\r |
| 56 | /* try to convert to gzip stream, so we could use standard gzio functions from zlib */\r |
| 57 | gzf = zip2gz(zipfile, zipentry);\r |
| 58 | if (gzf == NULL) goto zip_failed;\r |
| 59 | \r |
| 60 | file = malloc(sizeof(*file));\r |
| 61 | if (file == NULL) goto zip_failed;\r |
| 62 | file->file = zipfile;\r |
| 63 | file->param = gzf;\r |
| 64 | file->size = zipentry->uncompressed_size;\r |
| 65 | file->type = PMT_ZIP;\r |
| 66 | return file;\r |
| 67 | \r |
| 68 | zip_failed:\r |
| 69 | if (gzf) {\r |
| 70 | gzclose(gzf);\r |
| 71 | zipfile->fp = NULL; // gzclose() closed it\r |
| 72 | }\r |
| 73 | closezip(zipfile);\r |
| 74 | return NULL;\r |
| 75 | }\r |
| 76 | }\r |
| 77 | \r |
| 78 | /* not a zip, treat as uncompressed file */\r |
| 79 | f = fopen(path, "rb");\r |
| 80 | if (f == NULL) return NULL;\r |
| 81 | \r |
| 82 | /* we use our own buffering */\r |
| 83 | setvbuf(f, NULL, _IONBF, 0);\r |
| 84 | \r |
| 85 | file = malloc(sizeof(*file));\r |
| 86 | if (file == NULL) {\r |
| 87 | fclose(f);\r |
| 88 | return NULL;\r |
| 89 | }\r |
| 90 | fseek(f, 0, SEEK_END);\r |
| 91 | file->file = f;\r |
| 92 | file->param = NULL;\r |
| 93 | file->size = ftell(f);\r |
| 94 | file->type = PMT_UNCOMPRESSED;\r |
| 95 | fseek(f, 0, SEEK_SET);\r |
| 96 | return file;\r |
| 97 | }\r |
| 98 | \r |
| 99 | size_t pm_read(void *ptr, size_t bytes, pm_file *stream)\r |
| 100 | {\r |
| 101 | int ret;\r |
| 102 | \r |
| 103 | if (stream->type == PMT_UNCOMPRESSED)\r |
| 104 | {\r |
| 105 | ret = fread(ptr, 1, bytes, stream->file);\r |
| 106 | }\r |
| 107 | else if (stream->type == PMT_ZIP)\r |
| 108 | {\r |
| 109 | gzFile gf = stream->param;\r |
| 110 | int err;\r |
| 111 | ret = gzread(gf, ptr, bytes);\r |
| 112 | err = gzerror2(gf);\r |
| 113 | if (ret > 0 && (err == Z_DATA_ERROR || err == Z_STREAM_END))\r |
| 114 | /* we must reset stream pointer or else next seek/read fails */\r |
| 115 | gzrewind(gf);\r |
| 116 | }\r |
| 117 | else\r |
| 118 | ret = 0;\r |
| 119 | \r |
| 120 | return ret;\r |
| 121 | }\r |
| 122 | \r |
| 123 | int pm_seek(pm_file *stream, long offset, int whence)\r |
| 124 | {\r |
| 125 | if (stream->type == PMT_UNCOMPRESSED)\r |
| 126 | {\r |
| 127 | fseek(stream->file, offset, whence);\r |
| 128 | return ftell(stream->file);\r |
| 129 | }\r |
| 130 | else if (stream->type == PMT_ZIP)\r |
| 131 | {\r |
| 132 | if (PicoMessage != NULL && offset > 6*1024*1024) {\r |
| 133 | long pos = gztell((gzFile) stream->param);\r |
| 134 | if (offset < pos || offset - pos > 6*1024*1024)\r |
| 135 | PicoMessage("Decompressing data...");\r |
| 136 | }\r |
| 137 | return gzseek((gzFile) stream->param, offset, whence);\r |
| 138 | }\r |
| 139 | else\r |
| 140 | return -1;\r |
| 141 | }\r |
| 142 | \r |
| 143 | int pm_close(pm_file *fp)\r |
| 144 | {\r |
| 145 | int ret = 0;\r |
| 146 | \r |
| 147 | if (fp == NULL) return EOF;\r |
| 148 | \r |
| 149 | if (fp->type == PMT_UNCOMPRESSED)\r |
| 150 | {\r |
| 151 | fclose(fp->file);\r |
| 152 | }\r |
| 153 | else if (fp->type == PMT_ZIP)\r |
| 154 | {\r |
| 155 | ZIP *zipfile = fp->file;\r |
| 156 | gzclose((gzFile) fp->param);\r |
| 157 | zipfile->fp = NULL; // gzclose() closed it\r |
| 158 | closezip(zipfile);\r |
| 159 | }\r |
| 160 | else\r |
| 161 | ret = EOF;\r |
| 162 | \r |
| 163 | free(fp);\r |
| 164 | return ret;\r |
| 165 | }\r |
| 166 | \r |
| 167 | \r |
| 168 | void Byteswap(unsigned char *data,int len)\r |
| 169 | {\r |
| 170 | int i=0;\r |
| 171 | \r |
| 172 | if (len<2) return; // Too short\r |
| 173 | \r |
| 174 | do\r |
| 175 | {\r |
| 176 | unsigned short *pd=(unsigned short *)(data+i);\r |
| 177 | int value=*pd; // Get 2 bytes\r |
| 178 | \r |
| 179 | value=(value<<8)|(value>>8); // Byteswap it\r |
| 180 | *pd=(unsigned short)value; // Put 2b ytes\r |
| 181 | i+=2;\r |
| 182 | }\r |
| 183 | while (i+2<=len);\r |
| 184 | }\r |
| 185 | \r |
| 186 | // Interleve a 16k block and byteswap\r |
| 187 | static int InterleveBlock(unsigned char *dest,unsigned char *src)\r |
| 188 | {\r |
| 189 | int i=0;\r |
| 190 | for (i=0;i<0x2000;i++) dest[(i<<1) ]=src[ i]; // Odd\r |
| 191 | for (i=0;i<0x2000;i++) dest[(i<<1)+1]=src[0x2000+i]; // Even\r |
| 192 | return 0;\r |
| 193 | }\r |
| 194 | \r |
| 195 | // Decode a SMD file\r |
| 196 | static int DecodeSmd(unsigned char *data,int len)\r |
| 197 | {\r |
| 198 | unsigned char *temp=NULL;\r |
| 199 | int i=0;\r |
| 200 | \r |
| 201 | temp=(unsigned char *)malloc(0x4000);\r |
| 202 | if (temp==NULL) return 1;\r |
| 203 | memset(temp,0,0x4000);\r |
| 204 | \r |
| 205 | // Interleve each 16k block and shift down by 0x200:\r |
| 206 | for (i=0; i+0x4200<=len; i+=0x4000)\r |
| 207 | {\r |
| 208 | InterleveBlock(temp,data+0x200+i); // Interleve 16k to temporary buffer\r |
| 209 | memcpy(data+i,temp,0x4000); // Copy back in\r |
| 210 | }\r |
| 211 | \r |
| 212 | free(temp);\r |
| 213 | return 0;\r |
| 214 | }\r |
| 215 | \r |
| 216 | static unsigned char *cd_realloc(void *old, int filesize)\r |
| 217 | {\r |
| 218 | unsigned char *rom;\r |
| 219 | dprintf("sizeof(mcd_state): %i", sizeof(mcd_state));\r |
| 220 | rom=realloc(old, sizeof(mcd_state));\r |
| 221 | if (rom) memset(rom+0x20000, 0, sizeof(mcd_state)-0x20000);\r |
| 222 | return rom;\r |
| 223 | }\r |
| 224 | \r |
| 225 | static unsigned char *PicoCartAlloc(int filesize)\r |
| 226 | {\r |
| 227 | int alloc_size;\r |
| 228 | unsigned char *rom;\r |
| 229 | \r |
| 230 | if (PicoMCD & 1) return cd_realloc(NULL, filesize);\r |
| 231 | \r |
| 232 | alloc_size=filesize+0x7ffff;\r |
| 233 | if((filesize&0x3fff)==0x200) alloc_size-=0x200;\r |
| 234 | alloc_size&=~0x7ffff; // use alloc size of multiples of 512K, so that memhandlers could be set up more efficiently\r |
| 235 | if((filesize&0x3fff)==0x200) alloc_size+=0x200;\r |
| 236 | else if(alloc_size-filesize < 4) alloc_size+=4; // padding for out-of-bound exec protection\r |
| 237 | //dprintf("alloc_size: %x\n", alloc_size);\r |
| 238 | \r |
| 239 | // Allocate space for the rom plus padding\r |
| 240 | rom=(unsigned char *)malloc(alloc_size);\r |
| 241 | if(rom) memset(rom+alloc_size-0x80000,0,0x80000);\r |
| 242 | return rom;\r |
| 243 | }\r |
| 244 | \r |
| 245 | int PicoCartLoad(pm_file *f,unsigned char **prom,unsigned int *psize)\r |
| 246 | {\r |
| 247 | unsigned char *rom=NULL; int size;\r |
| 248 | if (f==NULL) return 1;\r |
| 249 | \r |
| 250 | size=f->size;\r |
| 251 | if (size <= 0) return 1;\r |
| 252 | size=(size+3)&~3; // Round up to a multiple of 4\r |
| 253 | \r |
| 254 | // Allocate space for the rom plus padding\r |
| 255 | rom=PicoCartAlloc(size);\r |
| 256 | if (rom==NULL) {\r |
| 257 | printf("out of memory (wanted %i)\n", size);\r |
| 258 | return 1;\r |
| 259 | }\r |
| 260 | \r |
| 261 | pm_read(rom,size,f); // Load up the rom\r |
| 262 | \r |
| 263 | // maybe we are loading MegaCD BIOS?\r |
| 264 | if (!(PicoMCD&1) && size == 0x20000 && (!strncmp((char *)rom+0x124, "BOOT", 4) || !strncmp((char *)rom+0x128, "BOOT", 4))) {\r |
| 265 | PicoMCD |= 1;\r |
| 266 | rom = cd_realloc(rom, size);\r |
| 267 | }\r |
| 268 | \r |
| 269 | // Check for SMD:\r |
| 270 | if ((size&0x3fff)==0x200) { DecodeSmd(rom,size); size-=0x200; } // Decode and byteswap SMD\r |
| 271 | else Byteswap(rom,size); // Just byteswap\r |
| 272 | \r |
| 273 | if (prom) *prom=rom;\r |
| 274 | if (psize) *psize=size;\r |
| 275 | \r |
| 276 | return 0;\r |
| 277 | }\r |
| 278 | \r |
| 279 | // Insert/remove a cartridge:\r |
| 280 | int PicoCartInsert(unsigned char *rom,unsigned int romsize)\r |
| 281 | {\r |
| 282 | // notaz: add a 68k "jump one op back" opcode to the end of ROM.\r |
| 283 | // This will hang the emu, but will prevent nasty crashes.\r |
| 284 | // note: 4 bytes are padded to every ROM\r |
| 285 | if(rom != NULL)\r |
| 286 | *(unsigned long *)(rom+romsize) = 0xFFFE4EFA; // 4EFA FFFE byteswapped\r |
| 287 | \r |
| 288 | SRam.resize=1;\r |
| 289 | Pico.rom=rom;\r |
| 290 | Pico.romsize=romsize;\r |
| 291 | \r |
| 292 | return PicoReset(1);\r |
| 293 | }\r |
| 294 | \r |
| 295 | int PicoUnloadCart(unsigned char* romdata)\r |
| 296 | {\r |
| 297 | free(romdata);\r |
| 298 | return 0;\r |
| 299 | }\r |
| 300 | \r |