cc68a136 |
1 | // This is part of Pico Library\r |
2 | \r |
3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
4 | // (c) Copyright 2006 notaz, All rights reserved.\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 | \r |
12 | void Byteswap(unsigned char *data,int len)\r |
13 | {\r |
14 | int i=0;\r |
15 | \r |
16 | if (len<2) return; // Too short\r |
17 | \r |
18 | do\r |
19 | {\r |
20 | unsigned short *pd=(unsigned short *)(data+i);\r |
21 | int value=*pd; // Get 2 bytes\r |
22 | \r |
23 | value=(value<<8)|(value>>8); // Byteswap it\r |
24 | *pd=(unsigned short)value; // Put 2b ytes\r |
25 | i+=2;\r |
26 | }\r |
27 | while (i+2<=len);\r |
28 | }\r |
29 | \r |
30 | // Interleve a 16k block and byteswap\r |
31 | static int InterleveBlock(unsigned char *dest,unsigned char *src)\r |
32 | {\r |
33 | int i=0;\r |
34 | for (i=0;i<0x2000;i++) dest[(i<<1) ]=src[ i]; // Odd\r |
35 | for (i=0;i<0x2000;i++) dest[(i<<1)+1]=src[0x2000+i]; // Even\r |
36 | return 0;\r |
37 | }\r |
38 | \r |
39 | // Decode a SMD file\r |
40 | static int DecodeSmd(unsigned char *data,int len)\r |
41 | {\r |
42 | unsigned char *temp=NULL;\r |
43 | int i=0;\r |
44 | \r |
45 | temp=(unsigned char *)malloc(0x4000);\r |
46 | if (temp==NULL) return 1;\r |
47 | memset(temp,0,0x4000);\r |
48 | \r |
49 | // Interleve each 16k block and shift down by 0x200:\r |
50 | for (i=0; i+0x4200<=len; i+=0x4000)\r |
51 | {\r |
52 | InterleveBlock(temp,data+0x200+i); // Interleve 16k to temporary buffer\r |
53 | memcpy(data+i,temp,0x4000); // Copy back in\r |
54 | }\r |
55 | \r |
56 | free(temp);\r |
57 | return 0;\r |
58 | }\r |
59 | \r |
60 | static unsigned char *PicoCartAlloc(int filesize)\r |
61 | {\r |
62 | int alloc_size;\r |
63 | unsigned char *rom;\r |
64 | \r |
65 | if (PicoMCD & 1) {\r |
66 | dprintf("sizeof(mcd_state): %i", sizeof(mcd_state));\r |
67 | if (filesize > 0x20000) return NULL; // invalid BIOS\r |
68 | rom=(unsigned char *)malloc(sizeof(mcd_state));\r |
69 | if (rom) memset(rom, 0, sizeof(mcd_state));\r |
70 | return rom;\r |
71 | }\r |
72 | \r |
73 | alloc_size=filesize+0x7ffff;\r |
74 | if((filesize&0x3fff)==0x200) alloc_size-=0x200;\r |
75 | alloc_size&=~0x7ffff; // use alloc size of multiples of 512K, so that memhandlers could be set up more efficiently\r |
76 | if((filesize&0x3fff)==0x200) alloc_size+=0x200;\r |
77 | else if(alloc_size-filesize < 4) alloc_size+=4; // padding for out-of-bound exec protection\r |
78 | //dprintf("alloc_size: %x\n", alloc_size);\r |
79 | \r |
80 | // Allocate space for the rom plus padding\r |
81 | rom=(unsigned char *)malloc(alloc_size);\r |
82 | if(rom) memset(rom+alloc_size-0x80000,0,0x80000);\r |
83 | return rom;\r |
84 | }\r |
85 | \r |
86 | int PicoCartLoad(FILE *f,unsigned char **prom,unsigned int *psize)\r |
87 | {\r |
88 | unsigned char *rom=NULL; int size;\r |
89 | if (f==NULL) return 1;\r |
90 | \r |
91 | fseek(f,0,SEEK_END); size=ftell(f); fseek(f,0,SEEK_SET);\r |
92 | if (size <= 0) return 1;\r |
93 | if (PicoMCD & 1) {\r |
94 | if (size > 0x20000) return 1; // invalid BIOS\r |
95 | size = 0xe0000;\r |
96 | } else {\r |
97 | size=(size+3)&~3; // Round up to a multiple of 4\r |
98 | }\r |
99 | \r |
100 | // Allocate space for the rom plus padding\r |
101 | rom=PicoCartAlloc(size);\r |
102 | if (rom==NULL) return 1; // { fclose(f); return 1; }\r |
103 | \r |
104 | fread(rom,1,size,f); // Load up the rom\r |
105 | // fclose(f); // this is confusing. From now on, caller should close it, because it opened this.\r |
106 | \r |
107 | // Check for SMD:\r |
108 | if ((size&0x3fff)==0x200) { DecodeSmd(rom,size); size-=0x200; } // Decode and byteswap SMD\r |
109 | else Byteswap(rom,size); // Just byteswap\r |
110 | \r |
111 | if (prom) *prom=rom;\r |
112 | if (psize) *psize=size;\r |
113 | \r |
114 | return 0;\r |
115 | }\r |
116 | \r |
117 | // Insert/remove a cartridge:\r |
118 | int PicoCartInsert(unsigned char *rom,unsigned int romsize)\r |
119 | {\r |
120 | // notaz: add a 68k "jump one op back" opcode to the end of ROM.\r |
121 | // This will hang the emu, but will prevent nasty crashes.\r |
122 | // note: 4 bytes are padded to every ROM\r |
123 | if(rom != NULL)\r |
124 | *(unsigned long *)(rom+romsize) = 0xFFFE4EFA; // 4EFA FFFE byteswapped\r |
125 | \r |
126 | SRam.resize=1;\r |
127 | Pico.rom=rom;\r |
128 | Pico.romsize=romsize;\r |
129 | \r |
130 | return PicoReset(1);\r |
131 | }\r |
132 | \r |
133 | int PicoUnloadCart(unsigned char* romdata)\r |
134 | {\r |
135 | free(romdata);\r |
136 | return 0;\r |
137 | }\r |
138 | \r |
139 | \r |
140 | #ifdef _UNZIP_SUPPORT\r |
141 | \r |
142 | // notaz\r |
143 | #include "../unzip/unzip.h"\r |
144 | \r |
145 | // nearly same as PicoCartLoad, but works with zipfiles\r |
146 | int CartLoadZip(const char *fname, unsigned char **prom, unsigned int *psize)\r |
147 | {\r |
148 | unsigned char *rom=0;\r |
149 | struct zipent* zipentry;\r |
150 | int size;\r |
151 | ZIP *zipfile = openzip(fname);\r |
152 | \r |
153 | if(!zipfile) return 1;\r |
154 | \r |
155 | // find first bin or smd\r |
156 | while((zipentry = readzip(zipfile)) != 0)\r |
157 | {\r |
158 | char *ext;\r |
159 | if(strlen(zipentry->name) < 5) continue;\r |
160 | ext = zipentry->name+strlen(zipentry->name)-4;\r |
161 | \r |
162 | if(!strcasecmp(ext, ".bin") || !strcasecmp(ext, ".smd") || !strcasecmp(ext, ".gen")) break;\r |
163 | }\r |
164 | \r |
165 | if(!zipentry) {\r |
166 | closezip(zipfile);\r |
167 | return 4; // no roms\r |
168 | }\r |
169 | \r |
170 | size = zipentry->uncompressed_size;\r |
171 | \r |
172 | size=(size+3)&~3; // Round up to a multiple of 4\r |
173 | \r |
174 | // Allocate space for the rom plus padding\r |
175 | rom=PicoCartAlloc(size);\r |
176 | if (rom==NULL) { closezip(zipfile); return 2; }\r |
177 | \r |
178 | if(readuncompresszip(zipfile, zipentry, (char *)rom) != 0) {\r |
179 | free(rom);\r |
180 | rom = 0;\r |
181 | closezip(zipfile);\r |
182 | return 5; // unzip failed\r |
183 | }\r |
184 | \r |
185 | closezip(zipfile);\r |
186 | \r |
187 | // Check for SMD:\r |
188 | if ((size&0x3fff)==0x200) { DecodeSmd(rom,size); size-=0x200; } // Decode and byteswap SMD\r |
189 | else Byteswap(rom,size); // Just byteswap\r |
190 | \r |
191 | if (prom) *prom=rom;\r |
192 | if (psize) *psize=size;\r |
193 | \r |
194 | return 0;\r |
195 | }\r |
196 | \r |
197 | #endif\r |