1 // This is part of Pico Library
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3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006 notaz, All rights reserved.
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5 // Free for non-commercial use.
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7 // For commercial use, separate licencing terms must be obtained.
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10 #include "PicoInt.h"
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11 #include "../zlib/zlib.h"
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12 #include "../unzip/unzip.h"
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13 #include "../unzip/unzip_stream.h"
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15 static char *rom_exts[] = { "bin", "gen", "smd", "iso" };
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18 pm_file *pm_open(const char *path)
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20 pm_file *file = NULL;
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24 if (path == NULL) return NULL;
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26 if (strlen(path) < 5) ext = NULL; // no ext
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27 else ext = path + strlen(path) - 3;
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29 if (ext && strcasecmp(ext, "zip") == 0)
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31 struct zipent *zipentry;
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36 zipfile = openzip(path);
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38 if (zipfile != NULL)
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40 /* search for suitable file (right extension or large enough file) */
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41 while ((zipentry = readzip(zipfile)) != NULL)
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43 if (zipentry->uncompressed_size >= 128*1024) goto found_rom_zip;
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44 if (strlen(zipentry->name) < 5) continue;
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46 ext = zipentry->name+strlen(zipentry->name)-3;
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47 for (i = 0; i < sizeof(rom_exts)/sizeof(rom_exts[0]); i++)
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48 if (!strcasecmp(ext, rom_exts[i]) == 0) goto found_rom_zip;
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51 /* zipfile given, but nothing found suitable for us inside */
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55 /* try to convert to gzip stream, so we could use standard gzio functions from zlib */
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56 gzf = zip2gz(zipfile, zipentry);
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57 if (gzf == NULL) goto zip_failed;
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59 file = malloc(sizeof(*file));
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60 if (file == NULL) goto zip_failed;
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61 file->file = zipfile;
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63 file->size = zipentry->uncompressed_size;
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64 file->type = PMT_ZIP;
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70 zipfile->fp = NULL; // gzclose() closed it
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77 /* not a zip, treat as uncompressed file */
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78 f = fopen(path, "rb");
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79 if (f == NULL) return NULL;
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81 file = malloc(sizeof(*file));
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86 fseek(f, 0, SEEK_END);
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89 file->size = ftell(f);
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90 file->type = PMT_UNCOMPRESSED;
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91 fseek(f, 0, SEEK_SET);
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95 size_t pm_read(void *ptr, size_t bytes, pm_file *stream)
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99 if (stream->type == PMT_UNCOMPRESSED)
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101 ret = fread(ptr, 1, bytes, stream->file);
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103 else if (stream->type == PMT_ZIP)
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105 gzFile gf = stream->param;
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107 ret = gzread(gf, ptr, bytes);
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108 err = gzerror2(gf);
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109 if (ret > 0 && (err == Z_DATA_ERROR || err == Z_STREAM_END))
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110 /* we must reset stream pointer or else next seek/read fails */
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119 int pm_seek(pm_file *stream, long offset, int whence)
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121 if (stream->type == PMT_UNCOMPRESSED)
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123 return fseek(stream->file, offset, whence);
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125 else if (stream->type == PMT_ZIP)
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127 return gzseek((gzFile) stream->param, offset, whence);
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133 int pm_close(pm_file *fp)
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137 if (fp == NULL) return EOF;
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139 if (fp->type == PMT_UNCOMPRESSED)
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143 else if (fp->type == PMT_ZIP)
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145 ZIP *zipfile = fp->file;
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146 gzclose((gzFile) fp->param);
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147 zipfile->fp = NULL; // gzclose() closed it
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158 void Byteswap(unsigned char *data,int len)
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162 if (len<2) return; // Too short
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166 unsigned short *pd=(unsigned short *)(data+i);
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167 int value=*pd; // Get 2 bytes
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169 value=(value<<8)|(value>>8); // Byteswap it
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170 *pd=(unsigned short)value; // Put 2b ytes
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176 // Interleve a 16k block and byteswap
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177 static int InterleveBlock(unsigned char *dest,unsigned char *src)
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180 for (i=0;i<0x2000;i++) dest[(i<<1) ]=src[ i]; // Odd
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181 for (i=0;i<0x2000;i++) dest[(i<<1)+1]=src[0x2000+i]; // Even
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185 // Decode a SMD file
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186 static int DecodeSmd(unsigned char *data,int len)
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188 unsigned char *temp=NULL;
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191 temp=(unsigned char *)malloc(0x4000);
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192 if (temp==NULL) return 1;
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193 memset(temp,0,0x4000);
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195 // Interleve each 16k block and shift down by 0x200:
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196 for (i=0; i+0x4200<=len; i+=0x4000)
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198 InterleveBlock(temp,data+0x200+i); // Interleve 16k to temporary buffer
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199 memcpy(data+i,temp,0x4000); // Copy back in
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206 static unsigned char *cd_realloc(void *old, int filesize)
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208 unsigned char *rom;
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209 dprintf("sizeof(mcd_state): %i", sizeof(mcd_state));
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210 rom=realloc(old, sizeof(mcd_state));
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211 if (rom) memset(rom+0x20000, 0, sizeof(mcd_state)-0x20000);
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215 static unsigned char *PicoCartAlloc(int filesize)
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218 unsigned char *rom;
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220 if (PicoMCD & 1) return cd_realloc(NULL, filesize);
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222 alloc_size=filesize+0x7ffff;
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223 if((filesize&0x3fff)==0x200) alloc_size-=0x200;
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224 alloc_size&=~0x7ffff; // use alloc size of multiples of 512K, so that memhandlers could be set up more efficiently
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225 if((filesize&0x3fff)==0x200) alloc_size+=0x200;
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226 else if(alloc_size-filesize < 4) alloc_size+=4; // padding for out-of-bound exec protection
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227 //dprintf("alloc_size: %x\n", alloc_size);
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229 // Allocate space for the rom plus padding
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230 rom=(unsigned char *)malloc(alloc_size);
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231 if(rom) memset(rom+alloc_size-0x80000,0,0x80000);
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235 int PicoCartLoad(pm_file *f,unsigned char **prom,unsigned int *psize)
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237 unsigned char *rom=NULL; int size;
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238 if (f==NULL) return 1;
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241 if (size <= 0) return 1;
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242 size=(size+3)&~3; // Round up to a multiple of 4
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244 // Allocate space for the rom plus padding
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245 rom=PicoCartAlloc(size);
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246 if (rom==NULL) return 1; // { fclose(f); return 1; }
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248 pm_read(rom,size,f); // Load up the rom
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250 // maybe we are loading MegaCD BIOS?
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251 if (!(PicoMCD&1) && size == 0x20000 && (!strncmp((char *)rom+0x124, "BOOT", 4) || !strncmp((char *)rom+0x128, "BOOT", 4))) {
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253 rom = cd_realloc(rom, size);
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257 if ((size&0x3fff)==0x200) { DecodeSmd(rom,size); size-=0x200; } // Decode and byteswap SMD
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258 else Byteswap(rom,size); // Just byteswap
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260 if (prom) *prom=rom;
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261 if (psize) *psize=size;
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266 // Insert/remove a cartridge:
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267 int PicoCartInsert(unsigned char *rom,unsigned int romsize)
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269 // notaz: add a 68k "jump one op back" opcode to the end of ROM.
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270 // This will hang the emu, but will prevent nasty crashes.
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271 // note: 4 bytes are padded to every ROM
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273 *(unsigned long *)(rom+romsize) = 0xFFFE4EFA; // 4EFA FFFE byteswapped
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277 Pico.romsize=romsize;
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279 return PicoReset(1);
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282 int PicoUnloadCart(unsigned char* romdata)
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