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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 |
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60 | static unsigned char *cd_realloc(void *old, int filesize)\r |
61 | {\r |
62 | unsigned char *rom;\r |
63 | dprintf("sizeof(mcd_state): %i", sizeof(mcd_state));\r |
64 | rom=realloc(old, sizeof(mcd_state));\r |
65 | if (rom) memset(rom+0x20000, 0, sizeof(mcd_state)-0x20000);\r |
66 | return rom;\r |
67 | }\r |
68 | \r |
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69 | static unsigned char *PicoCartAlloc(int filesize)\r |
70 | {\r |
71 | int alloc_size;\r |
72 | unsigned char *rom;\r |
73 | \r |
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74 | if (PicoMCD & 1) return cd_realloc(NULL, filesize);\r |
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75 | \r |
76 | alloc_size=filesize+0x7ffff;\r |
77 | if((filesize&0x3fff)==0x200) alloc_size-=0x200;\r |
78 | alloc_size&=~0x7ffff; // use alloc size of multiples of 512K, so that memhandlers could be set up more efficiently\r |
79 | if((filesize&0x3fff)==0x200) alloc_size+=0x200;\r |
80 | else if(alloc_size-filesize < 4) alloc_size+=4; // padding for out-of-bound exec protection\r |
81 | //dprintf("alloc_size: %x\n", alloc_size);\r |
82 | \r |
83 | // Allocate space for the rom plus padding\r |
84 | rom=(unsigned char *)malloc(alloc_size);\r |
85 | if(rom) memset(rom+alloc_size-0x80000,0,0x80000);\r |
86 | return rom;\r |
87 | }\r |
88 | \r |
89 | int PicoCartLoad(FILE *f,unsigned char **prom,unsigned int *psize)\r |
90 | {\r |
91 | unsigned char *rom=NULL; int size;\r |
92 | if (f==NULL) return 1;\r |
93 | \r |
94 | fseek(f,0,SEEK_END); size=ftell(f); fseek(f,0,SEEK_SET);\r |
95 | if (size <= 0) return 1;\r |
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96 | size=(size+3)&~3; // Round up to a multiple of 4\r |
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97 | \r |
98 | // Allocate space for the rom plus padding\r |
99 | rom=PicoCartAlloc(size);\r |
100 | if (rom==NULL) return 1; // { fclose(f); return 1; }\r |
101 | \r |
102 | fread(rom,1,size,f); // Load up the rom\r |
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103 | \r |
104 | // maybe we are loading MegaCD BIOS?\r |
105 | if (!(PicoMCD&1) && size == 0x20000 && (!strncmp((char *)rom+0x124, "BOOT", 4) || !strncmp((char *)rom+0x128, "BOOT", 4))) {\r |
106 | PicoMCD |= 1;\r |
107 | rom = cd_realloc(rom, size);\r |
108 | }\r |
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109 | \r |
110 | // Check for SMD:\r |
111 | if ((size&0x3fff)==0x200) { DecodeSmd(rom,size); size-=0x200; } // Decode and byteswap SMD\r |
112 | else Byteswap(rom,size); // Just byteswap\r |
113 | \r |
114 | if (prom) *prom=rom;\r |
115 | if (psize) *psize=size;\r |
116 | \r |
117 | return 0;\r |
118 | }\r |
119 | \r |
120 | // Insert/remove a cartridge:\r |
121 | int PicoCartInsert(unsigned char *rom,unsigned int romsize)\r |
122 | {\r |
123 | // notaz: add a 68k "jump one op back" opcode to the end of ROM.\r |
124 | // This will hang the emu, but will prevent nasty crashes.\r |
125 | // note: 4 bytes are padded to every ROM\r |
126 | if(rom != NULL)\r |
127 | *(unsigned long *)(rom+romsize) = 0xFFFE4EFA; // 4EFA FFFE byteswapped\r |
128 | \r |
129 | SRam.resize=1;\r |
130 | Pico.rom=rom;\r |
131 | Pico.romsize=romsize;\r |
132 | \r |
133 | return PicoReset(1);\r |
134 | }\r |
135 | \r |
136 | int PicoUnloadCart(unsigned char* romdata)\r |
137 | {\r |
138 | free(romdata);\r |
139 | return 0;\r |
140 | }\r |
141 | \r |
142 | \r |
143 | #ifdef _UNZIP_SUPPORT\r |
144 | \r |
145 | // notaz\r |
146 | #include "../unzip/unzip.h"\r |
147 | \r |
148 | // nearly same as PicoCartLoad, but works with zipfiles\r |
149 | int CartLoadZip(const char *fname, unsigned char **prom, unsigned int *psize)\r |
150 | {\r |
151 | unsigned char *rom=0;\r |
152 | struct zipent* zipentry;\r |
153 | int size;\r |
154 | ZIP *zipfile = openzip(fname);\r |
155 | \r |
156 | if(!zipfile) return 1;\r |
157 | \r |
158 | // find first bin or smd\r |
159 | while((zipentry = readzip(zipfile)) != 0)\r |
160 | {\r |
161 | char *ext;\r |
162 | if(strlen(zipentry->name) < 5) continue;\r |
163 | ext = zipentry->name+strlen(zipentry->name)-4;\r |
164 | \r |
165 | if(!strcasecmp(ext, ".bin") || !strcasecmp(ext, ".smd") || !strcasecmp(ext, ".gen")) break;\r |
166 | }\r |
167 | \r |
168 | if(!zipentry) {\r |
169 | closezip(zipfile);\r |
170 | return 4; // no roms\r |
171 | }\r |
172 | \r |
173 | size = zipentry->uncompressed_size;\r |
174 | \r |
175 | size=(size+3)&~3; // Round up to a multiple of 4\r |
176 | \r |
177 | // Allocate space for the rom plus padding\r |
178 | rom=PicoCartAlloc(size);\r |
179 | if (rom==NULL) { closezip(zipfile); return 2; }\r |
180 | \r |
181 | if(readuncompresszip(zipfile, zipentry, (char *)rom) != 0) {\r |
182 | free(rom);\r |
183 | rom = 0;\r |
184 | closezip(zipfile);\r |
185 | return 5; // unzip failed\r |
186 | }\r |
187 | \r |
188 | closezip(zipfile);\r |
189 | \r |
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190 | // maybe we are loading MegaCD BIOS?\r |
191 | if (!(PicoMCD&1) && size == 0x20000 &&\r |
192 | (!strncmp((char *)rom+0x124, "BOOT", 4) || !strncmp((char *)rom+0x128, "BOOT", 4))) {\r |
193 | PicoMCD |= 1;\r |
194 | rom = cd_realloc(rom, size);\r |
195 | }\r |
196 | \r |
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197 | // Check for SMD:\r |
198 | if ((size&0x3fff)==0x200) { DecodeSmd(rom,size); size-=0x200; } // Decode and byteswap SMD\r |
199 | else Byteswap(rom,size); // Just byteswap\r |
200 | \r |
201 | if (prom) *prom=rom;\r |
202 | if (psize) *psize=size;\r |
203 | \r |
204 | return 0;\r |
205 | }\r |
206 | \r |
207 | #endif\r |