| nkeynes@1 | 1 | /*
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| nkeynes@1 | 2 | *
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| nkeynes@1 | 3 | */
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| nkeynes@1 | 4 |
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| nkeynes@1 | 5 | #include <stdio.h>
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| nkeynes@1 | 6 | #include <fcntl.h>
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| nkeynes@1 | 7 | #include <sys/stat.h>
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| nkeynes@1 | 8 | #include <sys/mman.h>
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| nkeynes@1 | 9 | #include <errno.h>
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| nkeynes@1 | 10 | #include <stdint.h>
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| nkeynes@1 | 11 | #include "gui.h"
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| nkeynes@1 | 12 | #include "ipbin.h"
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| nkeynes@1 | 13 | #include "sh4core.h"
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| nkeynes@1 | 14 | #include "mem.h"
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| nkeynes@1 | 15 |
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| nkeynes@1 | 16 | char ip_bin_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
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| nkeynes@1 | 17 | char iso_magic[6] = "\001CD001";
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| nkeynes@1 | 18 |
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| nkeynes@1 | 19 | #define CDI_V2 0x80000004
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| nkeynes@1 | 20 | #define CDI_V3 0x80000005
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| nkeynes@1 | 21 |
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| nkeynes@1 | 22 | void open_file( char *filename )
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| nkeynes@1 | 23 | {
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| nkeynes@1 | 24 | char buf[32];
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| nkeynes@1 | 25 | uint32_t tmpa[2];
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| nkeynes@1 | 26 | struct stat st;
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| nkeynes@1 | 27 |
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| nkeynes@1 | 28 | int fd = open( filename, O_RDONLY );
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| nkeynes@1 | 29 | if( fd == -1 ) {
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| nkeynes@1 | 30 | ERROR( "Unable to open file: '%s' (%s)", filename,
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| nkeynes@1 | 31 | strerror(errno) );
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| nkeynes@1 | 32 | return;
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| nkeynes@1 | 33 | }
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| nkeynes@1 | 34 |
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| nkeynes@1 | 35 | fstat( fd, &st );
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| nkeynes@1 | 36 | if( st.st_size < 32768 ) {
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| nkeynes@1 | 37 | ERROR( "File '%s' too small to be a dreamcast image", filename );
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| nkeynes@1 | 38 | close(fd);
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| nkeynes@1 | 39 | return;
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| nkeynes@1 | 40 | }
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| nkeynes@1 | 41 |
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| nkeynes@1 | 42 | /* begin magic */
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| nkeynes@1 | 43 | if( read( fd, buf, 32 ) != 32 ) {
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| nkeynes@1 | 44 | ERROR( "Unable to read from file '%s'", filename );
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| nkeynes@1 | 45 | close(fd);
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| nkeynes@1 | 46 | return;
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| nkeynes@1 | 47 | }
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| nkeynes@1 | 48 | if( memcmp( buf, ip_bin_magic, 32 ) == 0 ) {
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| nkeynes@1 | 49 | /* we have a DC bootstrap */
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| nkeynes@1 | 50 | if( st.st_size == BOOTSTRAP_SIZE ) {
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| nkeynes@1 | 51 | char *load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
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| nkeynes@1 | 52 | /* Just the bootstrap, no image... */
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| nkeynes@1 | 53 | WARN( "File '%s' contains bootstrap only, loading anyway",
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| nkeynes@1 | 54 | filename );
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| nkeynes@1 | 55 | lseek( fd, 0, SEEK_SET );
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| nkeynes@1 | 56 | read( fd, load, BOOTSTRAP_SIZE );
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| nkeynes@1 | 57 | parse_ipbin( load );
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| nkeynes@1 | 58 | sh4_reset();
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| nkeynes@1 | 59 | sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
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| nkeynes@1 | 60 | set_disassembly_region( BOOTSTRAP_LOAD_ADDR );
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| nkeynes@1 | 61 | set_disassembly_pc( sh4r.pc, TRUE );
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| nkeynes@2 | 62 | update_gui();
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| nkeynes@1 | 63 | } else {
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| nkeynes@1 | 64 | /* look for a valid ISO9660 header */
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| nkeynes@1 | 65 | lseek( fd, 32768, SEEK_SET );
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| nkeynes@1 | 66 | read( fd, buf, 8 );
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| nkeynes@1 | 67 | if( memcmp( buf, iso_magic, 6 ) == 0 ) {
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| nkeynes@1 | 68 | /* Alright, got it */
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| nkeynes@1 | 69 | INFO( "Loading ISO9660 filesystem from '%s'",
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| nkeynes@1 | 70 | filename );
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| nkeynes@1 | 71 | }
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| nkeynes@1 | 72 | }
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| nkeynes@1 | 73 | } else {
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| nkeynes@1 | 74 | /* check if it's a CDI file: */
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| nkeynes@1 | 75 | lseek( fd, -8, SEEK_END );
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| nkeynes@1 | 76 | read( fd, &tmpa, 8 );
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| nkeynes@1 | 77 | if( tmpa[0] == CDI_V2 || tmpa[0] == CDI_V3 ) {
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| nkeynes@1 | 78 | /* Yup, it is */
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| nkeynes@1 | 79 | INFO( "Loading CDI file '%s'", filename );
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| nkeynes@1 | 80 | } else {
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| nkeynes@1 | 81 | ERROR( "Don't know what to do with '%s'", filename );
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| nkeynes@1 | 82 | }
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| nkeynes@1 | 83 | }
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| nkeynes@1 | 84 | close(fd);
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| nkeynes@1 | 85 | }
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lxdream 0.9.1