nkeynes@1: /*
nkeynes@1:  *
nkeynes@1:  */
nkeynes@1: 
nkeynes@1: #include <stdio.h>
nkeynes@1: #include <fcntl.h>
nkeynes@1: #include <sys/stat.h>
nkeynes@1: #include <sys/mman.h>
nkeynes@1: #include <errno.h>
nkeynes@1: #include <stdint.h>
nkeynes@1: #include "gui.h"
nkeynes@1: #include "ipbin.h"
nkeynes@1: #include "sh4core.h"
nkeynes@1: #include "mem.h"
nkeynes@1: 
nkeynes@1: char ip_bin_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
nkeynes@1: char iso_magic[6] = "\001CD001";
nkeynes@1: 
nkeynes@1: #define CDI_V2 0x80000004
nkeynes@1: #define CDI_V3 0x80000005
nkeynes@1: 
nkeynes@1: void open_file( char *filename )
nkeynes@1: {
nkeynes@1:     char buf[32];
nkeynes@1:     uint32_t tmpa[2];
nkeynes@1:     struct stat st;
nkeynes@1:     
nkeynes@1:     int fd = open( filename, O_RDONLY );
nkeynes@1:     if( fd == -1 ) {
nkeynes@1:         ERROR( "Unable to open file: '%s' (%s)", filename,
nkeynes@1:                strerror(errno) );
nkeynes@1:         return;
nkeynes@1:     }
nkeynes@1: 
nkeynes@1:     fstat( fd, &st );
nkeynes@1:     if( st.st_size < 32768 ) {
nkeynes@1:         ERROR( "File '%s' too small to be a dreamcast image", filename );
nkeynes@1:         close(fd);
nkeynes@1:         return;
nkeynes@1:     }
nkeynes@1:     
nkeynes@1:     /* begin magic */
nkeynes@1:     if( read( fd, buf, 32 ) != 32 ) {
nkeynes@1:         ERROR( "Unable to read from file '%s'", filename );
nkeynes@1:         close(fd);
nkeynes@1:         return;
nkeynes@1:     }
nkeynes@1:     if( memcmp( buf, ip_bin_magic, 32 ) == 0 ) {
nkeynes@1:         /* we have a DC bootstrap */
nkeynes@1:         if( st.st_size == BOOTSTRAP_SIZE ) {
nkeynes@1:             char *load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
nkeynes@1:             /* Just the bootstrap, no image... */
nkeynes@1:             WARN( "File '%s' contains bootstrap only, loading anyway",
nkeynes@1:                   filename );
nkeynes@1:             lseek( fd, 0, SEEK_SET );
nkeynes@1:             read( fd, load, BOOTSTRAP_SIZE );
nkeynes@1:             parse_ipbin( load );
nkeynes@1:             sh4_reset();
nkeynes@1:             sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
nkeynes@1:             set_disassembly_region( BOOTSTRAP_LOAD_ADDR );
nkeynes@1:             set_disassembly_pc( sh4r.pc, TRUE );
nkeynes@2:             update_gui();
nkeynes@1:         } else {
nkeynes@1:             /* look for a valid ISO9660 header */
nkeynes@1:             lseek( fd, 32768, SEEK_SET );
nkeynes@1:             read( fd, buf, 8 );
nkeynes@1:             if( memcmp( buf, iso_magic, 6 ) == 0 ) {
nkeynes@1:                 /* Alright, got it */
nkeynes@1:                 INFO( "Loading ISO9660 filesystem from '%s'",
nkeynes@1:                       filename );
nkeynes@1:             }
nkeynes@1:         }
nkeynes@1:     } else {
nkeynes@1:         /* check if it's a CDI file: */
nkeynes@1:         lseek( fd, -8, SEEK_END );
nkeynes@1:         read( fd, &tmpa, 8 );
nkeynes@1:         if( tmpa[0] == CDI_V2 || tmpa[0] == CDI_V3 ) {
nkeynes@1:             /* Yup, it is */
nkeynes@1:             INFO( "Loading CDI file '%s'", filename );
nkeynes@1:         } else {
nkeynes@1:             ERROR( "Don't know what to do with '%s'", filename );
nkeynes@1:         }
nkeynes@1:     }
nkeynes@1:     close(fd);
nkeynes@1: }