lxdream 0.9.1| filename | src/gdrom/cdi.c |
| changeset | 1:eea311cfd33e |
| next | 31:495e480360d7 |
| author | nkeynes |
| date | Thu Dec 08 13:38:00 2005 +0000 (18 years ago) |
| permissions | -rw-r--r-- |
| last change | Generalise the core debug window to allow multiple instances. Add cpu description structure to define different cpus for use by the debug window, in preparation for ARM implementation |
| view | annotate | diff | log | raw |
2 #include <stdlib.h>
3 #include <stdio.h>
4 #include <stdint.h>
5 #include <fcntl.h>
6 #include <errno.h>
7 #include <sys/stat.h>
8 #include "cdi.h"
10 #define CDI_V2 0x80000004
11 #define CDI_V3 0x80000005
13 static char track_start_marker[20] = { 0,0,1,0,0,0,255,255,255,255,
14 0,0,1,0,0,0,255,255,255,255 };
16 struct cdi_trailer {
17 uint32_t cdi_version;
18 uint32_t header_offset;
19 };
21 struct cdi_track {
22 int file_posn;
23 int length; /* bytes */
24 int pregap; /* sectors */
25 int mode;
26 int sector_size;
27 int session;
28 struct cdi_track *next;
29 };
31 struct cdi_handle {
32 int fd;
33 uint16_t num_sessions;
34 struct cdi_track *tracks;
35 };
39 struct cdi_track_data {
40 char unknown[0x19];
41 uint32_t pregap_length;
42 uint32_t length;
43 char unknown2[6];
44 uint32_t mode;
45 char unknown3[0x0c];
46 uint32_t start_lba;
47 uint32_t total_length;
48 char unknown4[0x10];
49 uint32_t sector_size;
50 char unknown5[0x1D];
51 } __attribute__((packed));
53 cdi_t cdi_open( char *filename )
54 {
55 #define BAIL( x, ... ) { fprintf( stderr, x, __VA_ARGS__ ); if( fd != -1 ) close(fd); return NULL; }
57 struct stat st;
58 int fd = -1, i,j, tmp;
59 int posn = 0, hdr;
60 long len;
61 struct cdi_trailer trail;
62 struct cdi_handle cdi;
63 uint16_t tracks;
64 uint32_t new_fmt;
65 char tmpc;
66 char marker[20];
68 fd = open( filename, O_RDONLY );
69 if( fd == -1 )
70 BAIL( "Unable to open file: %s (%s)\n", filename, strerror(errno) );
71 fstat( fd, &st );
72 if( st.st_size < 8 )
73 BAIL( "File is too small to be a valid CDI image: %s\n", filename );
74 len = lseek( fd, -8, SEEK_END );
75 read( fd, &trail, sizeof(trail) );
76 if( trail.header_offset > st.st_size ||
77 trail.header_offset == 0 )
78 BAIL( "Not a valid CDI image: %s\n", filename );
80 if( trail.cdi_version == CDI_V2 ) trail.cdi_version = 2;
81 else if( trail.cdi_version == CDI_V3 ) trail.cdi_version = 3;
82 else BAIL( "Unknown CDI version code %08x in %s\n", trail.cdi_version,
83 filename );
85 lseek( fd, trail.header_offset, SEEK_SET );
86 read( fd, &cdi.num_sessions, 2 );
89 printf( "CDI version: %d\n", trail.cdi_version );
90 printf( "Sessions: %d\n\n", cdi.num_sessions );
91 for( i=0; i< cdi.num_sessions; i++ ) {
92 read( fd, &tracks, 2 );
93 printf( "Session %d - %d tracks:\n", i+1, tracks );
94 for( j=0; j<tracks; j++ ) {
95 struct cdi_track_data trk;
97 read( fd, &new_fmt, 4 );
98 if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
99 printf( "Note: CDI image has 3.00.780+ flag set\n" );
100 lseek( fd, 8, SEEK_CUR );
101 }
102 read( fd, marker, 20 );
103 if( memcmp( marker, track_start_marker, 20) != 0 )
104 BAIL( "Track start marker not found, error reading cdi\n",NULL );
105 read( fd, &tmp, 4 );
106 printf( "Unknown 4 bytes: %08x\n", tmp );
107 read( fd, &tmpc, 1 );
108 lseek( fd, (int)tmpc, SEEK_CUR ); /* skip over the filename */
109 read( fd, &trk, sizeof(trk) );
110 switch( trk.sector_size ) {
111 case 0: trk.sector_size = 2048; hdr=0; break;
112 case 1: trk.sector_size = 2336; hdr=8; break;
113 case 2:
114 trk.sector_size = 2352;
115 if( trk.mode == 2 ) hdr=24;
116 else hdr=16;
117 break;
118 default: BAIL( "Unknown sector size: %d\n", trk.sector_size );
119 }
120 posn += hdr;
121 len = trk.length*trk.sector_size;
122 printf( " Track %d\n", j+1 );
123 printf( " Pregap: %08x\n", trk.pregap_length );
124 printf( " Length: %08x\n", trk.length );
125 printf( " Mode: %d\n", trk.mode );
126 printf( " Sector size: %d\n", trk.sector_size );
127 printf( " Start LBA: %08x\n", trk.start_lba );
128 printf( " Total length: %08x\n", trk.total_length );
129 printf( " ---\n" );
130 printf( " File position: %08x\n", posn+trk.pregap_length*trk.sector_size );
131 printf( " File length: %d\n", len );
132 posn += trk.total_length*trk.sector_size;
133 lseek( fd, 12, SEEK_CUR );
134 if( new_fmt )
135 lseek( fd, 78, SEEK_CUR );
136 tmp = lseek( fd, 0, SEEK_CUR );
137 printf( "(Header offset: %x)\n", tmp - trail.header_offset );
138 }
139 }
141 return NULL;
142 #undef BAIL(x, ...)
143 }
145 int main(int argc, char *argv[] )
146 {
147 int i;
149 for( i=1; i<argc; i++ ) {
150 cdi_open(argv[i]);
151 }
152 return 0;
153 }
.