lxdream 0.9.1| filename | src/loader.c |
| changeset | 1:eea311cfd33e |
| next | 2:42349f6ea216 |
| author | nkeynes |
| date | Sat Mar 13 00:03:32 2004 +0000 (18 years ago) |
| permissions | -rw-r--r-- |
| last change | This commit was generated by cvs2svn to compensate for changes in r2, which included commits to RCS files with non-trunk default branches. |
| view | annotate | diff | log | raw |
1 /*
2 *
3 */
5 #include <stdio.h>
6 #include <fcntl.h>
7 #include <sys/stat.h>
8 #include <sys/mman.h>
9 #include <errno.h>
10 #include <stdint.h>
11 #include "gui.h"
12 #include "ipbin.h"
13 #include "sh4core.h"
14 #include "mem.h"
16 char ip_bin_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
17 char iso_magic[6] = "\001CD001";
19 #define CDI_V2 0x80000004
20 #define CDI_V3 0x80000005
22 void open_file( char *filename )
23 {
24 char buf[32];
25 uint32_t tmpa[2];
26 struct stat st;
28 int fd = open( filename, O_RDONLY );
29 if( fd == -1 ) {
30 ERROR( "Unable to open file: '%s' (%s)", filename,
31 strerror(errno) );
32 return;
33 }
35 fstat( fd, &st );
36 if( st.st_size < 32768 ) {
37 ERROR( "File '%s' too small to be a dreamcast image", filename );
38 close(fd);
39 return;
40 }
42 /* begin magic */
43 if( read( fd, buf, 32 ) != 32 ) {
44 ERROR( "Unable to read from file '%s'", filename );
45 close(fd);
46 return;
47 }
48 if( memcmp( buf, ip_bin_magic, 32 ) == 0 ) {
49 /* we have a DC bootstrap */
50 if( st.st_size == BOOTSTRAP_SIZE ) {
51 char *load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
52 /* Just the bootstrap, no image... */
53 WARN( "File '%s' contains bootstrap only, loading anyway",
54 filename );
55 lseek( fd, 0, SEEK_SET );
56 read( fd, load, BOOTSTRAP_SIZE );
57 parse_ipbin( load );
58 sh4_reset();
59 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
60 set_disassembly_region( BOOTSTRAP_LOAD_ADDR );
61 set_disassembly_pc( sh4r.pc, TRUE );
62 update_registers();
63 } else {
64 /* look for a valid ISO9660 header */
65 lseek( fd, 32768, SEEK_SET );
66 read( fd, buf, 8 );
67 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
68 /* Alright, got it */
69 INFO( "Loading ISO9660 filesystem from '%s'",
70 filename );
71 }
72 }
73 } else {
74 /* check if it's a CDI file: */
75 lseek( fd, -8, SEEK_END );
76 read( fd, &tmpa, 8 );
77 if( tmpa[0] == CDI_V2 || tmpa[0] == CDI_V3 ) {
78 /* Yup, it is */
79 INFO( "Loading CDI file '%s'", filename );
80 } else {
81 ERROR( "Don't know what to do with '%s'", filename );
82 }
83 }
84 close(fd);
85 }
.