ref: bdd385803dcbccdf2750f7259a1784744541dec4
dir: /sys/src/cmd/disk/rd9660.c/
/*
* dump a 9660 cd image for a little while.
* for debugging.
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <disk.h>
Biobuf *b;
#pragma varargck type "s" uchar*
#pragma varargck type "L" uchar*
#pragma varargck type "B" uchar*
#pragma varargck type "N" uchar*
#pragma varargck type "T" uchar*
#pragma varargck type "D" uchar*
typedef struct Voldesc Voldesc;
struct Voldesc {
uchar magic[8]; /* 0x01, "CD001", 0x01, 0x00 */
uchar systemid[32]; /* system identifier */
uchar volumeid[32]; /* volume identifier */
uchar unused[8]; /* character set in secondary desc */
uchar volsize[8]; /* volume size */
uchar charset[32];
uchar volsetsize[4]; /* volume set size = 1 */
uchar volseqnum[4]; /* volume sequence number = 1 */
uchar blocksize[4]; /* logical block size */
uchar pathsize[8]; /* path table size */
uchar lpathloc[4]; /* Lpath */
uchar olpathloc[4]; /* optional Lpath */
uchar mpathloc[4]; /* Mpath */
uchar ompathloc[4]; /* optional Mpath */
uchar rootdir[34]; /* root directory */
uchar volsetid[128]; /* volume set identifier */
uchar publisher[128];
uchar prepid[128]; /* data preparer identifier */
uchar applid[128]; /* application identifier */
uchar notice[37]; /* copyright notice file */
uchar abstract[37]; /* abstract file */
uchar biblio[37]; /* bibliographic file */
uchar cdate[17]; /* creation date */
uchar mdate[17]; /* modification date */
uchar xdate[17]; /* expiration date */
uchar edate[17]; /* effective date */
uchar fsvers; /* file system version = 1 */
};
void
dumpbootvol(void *a)
{
Voldesc *v;
v = a;
print("magic %.2ux %.5s %.2ux %2ux\n",
v->magic[0], v->magic+1, v->magic[6], v->magic[7]);
if(v->magic[0] == 0xFF)
return;
print("system %.32T\n", v->systemid);
print("volume %.32T\n", v->volumeid);
print("volume size %.4N\n", v->volsize);
print("charset %.2ux %.2ux %.2ux %.2ux %.2ux %.2ux %.2ux %.2ux\n",
v->charset[0], v->charset[1], v->charset[2], v->charset[3],
v->charset[4], v->charset[5], v->charset[6], v->charset[7]);
print("volume set size %.2N\n", v->volsetsize);
print("volume sequence number %.2N\n", v->volseqnum);
print("logical block size %.2N\n", v->blocksize);
print("path size %.4L\n", v->pathsize);
print("lpath loc %.4L\n", v->lpathloc);
print("opt lpath loc %.4L\n", v->olpathloc);
print("mpath loc %.4B\n", v->mpathloc);
print("opt mpath loc %.4B\n", v->ompathloc);
print("rootdir %D\n", v->rootdir);
print("volume set identifier %.128T\n", v->volsetid);
print("publisher %.128T\n", v->publisher);
print("preparer %.128T\n", v->prepid);
print("application %.128T\n", v->applid);
print("notice %.37T\n", v->notice);
print("abstract %.37T\n", v->abstract);
print("biblio %.37T\n", v->biblio);
print("creation date %.17s\n", v->cdate);
print("modification date %.17s\n", v->mdate);
print("expiration date %.17s\n", v->xdate);
print("effective date %.17s\n", v->edate);
print("fs version %d\n", v->fsvers);
}
typedef struct Cdir Cdir;
struct Cdir {
uchar len;
uchar xlen;
uchar dloc[8];
uchar dlen[8];
uchar date[7];
uchar flags;
uchar unitsize;
uchar gapsize;
uchar volseqnum[4];
uchar namelen;
uchar name[1]; /* chumminess */
};
#pragma varargck type "D" Cdir*
int
Dfmt(Fmt *fmt)
{
char buf[128];
Cdir *c;
c = va_arg(fmt->args, Cdir*);
if(c->namelen == 1 && c->name[0] == '\0' || c->name[0] == '\001') {
snprint(buf, sizeof buf, ".%s dloc %.4N dlen %.4N",
c->name[0] ? "." : "", c->dloc, c->dlen);
} else {
snprint(buf, sizeof buf, "%.*T dloc %.4N dlen %.4N", c->namelen, c->name,
c->dloc, c->dlen);
}
fmtstrcpy(fmt, buf);
return 0;
}
typedef struct Path Path;
struct Path {
uchar namelen;
uchar xlen;
uchar dloc[4];
uchar parent[2];
uchar name[1]; /* chumminess */
};
#pragma varargck type "P" Path*
char longc, shortc;
void
bigend(void)
{
longc = 'B';
}
void
littleend(void)
{
longc = 'L';
}
int
Pfmt(Fmt *fmt)
{
char xfmt[128], buf[128];
Path *p;
p = va_arg(fmt->args, Path*);
sprint(xfmt, "data=%%.4%c up=%%.2%c name=%%.*T (%%d)", longc, longc);
snprint(buf, sizeof buf, xfmt, p->dloc, p->parent, p->namelen, p->name, p->namelen);
fmtstrcpy(fmt, buf);
return 0;
}
ulong
big(void *a, int n)
{
uchar *p;
ulong v;
int i;
p = a;
v = 0;
for(i=0; i<n; i++)
v = (v<<8) | *p++;
return v;
}
ulong
little(void *a, int n)
{
uchar *p;
ulong v;
int i;
p = a;
v = 0;
for(i=0; i<n; i++)
v |= (*p++<<(i*8));
return v;
}
/* numbers in big or little endian. */
int
BLfmt(Fmt *fmt)
{
ulong v;
uchar *p;
char buf[20];
p = va_arg(fmt->args, uchar*);
if(!(fmt->flags&FmtPrec)) {
fmtstrcpy(fmt, "*BL*");
return 0;
}
if(fmt->r == 'B')
v = big(p, fmt->prec);
else
v = little(p, fmt->prec);
sprint(buf, "0x%.*lux", fmt->prec*2, v);
fmt->flags &= ~FmtPrec;
fmtstrcpy(fmt, buf);
return 0;
}
/* numbers in both little and big endian */
int
Nfmt(Fmt *fmt)
{
char buf[100];
uchar *p;
p = va_arg(fmt->args, uchar*);
sprint(buf, "%.*L %.*B", fmt->prec, p, fmt->prec, p+fmt->prec);
fmt->flags &= ~FmtPrec;
fmtstrcpy(fmt, buf);
return 0;
}
int
asciiTfmt(Fmt *fmt)
{
char *p, buf[256];
int i;
p = va_arg(fmt->args, char*);
for(i=0; i<fmt->prec; i++)
buf[i] = *p++;
buf[i] = '\0';
for(p=buf+strlen(buf); p>buf && p[-1]==' '; p--)
;
p[0] = '\0';
fmt->flags &= ~FmtPrec;
fmtstrcpy(fmt, buf);
return 0;
}
int
runeTfmt(Fmt *fmt)
{
Rune buf[256], *r;
int i;
uchar *p;
p = va_arg(fmt->args, uchar*);
for(i=0; i*2+2<=fmt->prec; i++, p+=2)
buf[i] = (p[0]<<8)|p[1];
buf[i] = L'\0';
for(r=buf+i; r>buf && r[-1]==L' '; r--)
;
r[0] = L'\0';
fmt->flags &= ~FmtPrec;
return fmtprint(fmt, "%S", buf);
}
void
ascii(void)
{
fmtinstall('T', asciiTfmt);
}
void
joliet(void)
{
fmtinstall('T', runeTfmt);
}
void
getsect(uchar *buf, int n)
{
if(Bseek(b, n*2048, 0) != n*2048 || Bread(b, buf, 2048) != 2048)
sysfatal("reading block %ux", n);
}
void
pathtable(Voldesc *v, int islittle)
{
int i, j, n, sz, addr;
ulong (*word)(void*, int);
uchar x[2048], *p, *ep;
Path *pt;
print(">>> entire %s path table\n", islittle ? "little" : "big");
littleend();
if(islittle) {
littleend();
word = little;
}else{
bigend();
word = big;
}
sz = little(v->pathsize, 4); /* little, not word */
addr = word(islittle ? v->lpathloc : v->mpathloc, 4);
j = 0;
n = 1;
while(sz > 0){
getsect(x, addr);
p = x;
ep = x+sz;
if(ep > x+2048)
ep = x+2048;
for(i=0; p<ep; i++) {
pt = (Path*)p;
if(pt->namelen==0)
break;
print("0x%.4x %4d+%-4ld %P\n", n, j, p-x, pt);
n++;
p += 8+pt->namelen+(pt->namelen&1);
}
sz -= 2048;
addr++;
j++;
}
}
void
dump(void *root)
{
Voldesc *v;
Cdir *c;
long rootdirloc;
uchar x[2048];
int i;
uchar *p;
dumpbootvol(root);
v = (Voldesc*)root;
c = (Cdir*)v->rootdir;
rootdirloc = little(c->dloc, 4);
print(">>> sed 5q root directory\n");
getsect(x, rootdirloc);
p = x;
for(i=0; i<5 && (p-x)<little(c->dlen, 4); i++) {
print("%D\n", p);
p += ((Cdir*)p)->len;
}
pathtable(v, 1);
pathtable(v, 0);
}
void
main(int argc, char **argv)
{
uchar root[2048], jroot[2048];
if(argc != 2)
sysfatal("usage: %s file", argv[0]);
b = Bopen(argv[1], OREAD);
if(b == nil)
sysfatal("bopen %r");
fmtinstall('L', BLfmt);
fmtinstall('B', BLfmt);
fmtinstall('N', Nfmt);
fmtinstall('D', Dfmt);
fmtinstall('P', Pfmt);
getsect(root, 16);
ascii();
dump(root);
getsect(jroot, 17);
joliet();
dump(jroot);
exits(0);
}