ref: d39d1a5303541539f61488317b220c1eb724d7d3
dir: /sys/src/cmd/disk/9660/dump.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <libsec.h>
#include <ctype.h>
#include "iso9660.h"
static void
md5cd(Cdimg *cd, ulong block, ulong length, uchar *digest)
{
int n;
uchar buf[Blocksize];
DigestState *s;
s = md5(nil, 0, nil, nil);
while(length > 0) {
n = length;
if(n > Blocksize)
n = Blocksize;
Creadblock(cd, buf, block, n);
md5(buf, n, nil, s);
block++;
length -= n;
}
md5(nil, 0, digest, s);
}
static Dumpdir*
mkdumpdir(char *name, uchar *md5, ulong block, ulong length)
{
Dumpdir *d;
assert(block != 0);
d = emalloc(sizeof *d);
d->name = name;
memmove(d->md5, md5, sizeof d->md5);
d->block = block;
d->length = length;
return d;
}
static Dumpdir**
ltreewalkmd5(Dumpdir **l, uchar *md5)
{
int i;
while(*l) {
i = memcmp(md5, (*l)->md5, MD5dlen);
if(i < 0)
l = &(*l)->md5left;
else if(i == 0)
return l;
else
l = &(*l)->md5right;
}
return l;
}
static Dumpdir**
ltreewalkblock(Dumpdir **l, ulong block)
{
while(*l) {
if(block < (*l)->block)
l = &(*l)->blockleft;
else if(block == (*l)->block)
return l;
else
l = &(*l)->blockright;
}
return l;
}
/*
* Add a particular file to our binary tree.
*/
static void
addfile(Cdimg *cd, Dump *d, char *name, Direc *dir)
{
uchar md5[MD5dlen];
Dumpdir **lblock;
assert((dir->mode & DMDIR) == 0);
if(dir->length == 0)
return;
lblock = ltreewalkblock(&d->blockroot, dir->block);
if(*lblock != nil) {
if((*lblock)->length == dir->length)
return;
fprint(2, "block %lud length %lud %s %lud %s\n", dir->block, (*lblock)->length, (*lblock)->name,
dir->length, dir->name);
assert(0);
}
md5cd(cd, dir->block, dir->length, md5);
if(chatty > 1)
fprint(2, "note file %.16H %lud (%s)\n", md5, dir->length, dir->name);
insertmd5(d, name, md5, dir->block, dir->length);
}
void
insertmd5(Dump *d, char *name, uchar *md5, ulong block, ulong length)
{
Dumpdir **lmd5;
Dumpdir **lblock;
lblock = ltreewalkblock(&d->blockroot, block);
if(*lblock != nil) {
if((*lblock)->length == length)
return;
fprint(2, "block %lud length %lud %lud\n", block, (*lblock)->length, length);
assert(0);
}
assert(length != 0);
*lblock = mkdumpdir(name, md5, block, length);
lmd5 = ltreewalkmd5(&d->md5root, md5);
if(*lmd5 != nil)
fprint(2, "warning: data duplicated on CD\n");
else
*lmd5 = *lblock;
}
/*
* Fill all the children entries for a particular directory;
* all we care about is block, length, and whether it is a directory.
*/
void
readkids(Cdimg *cd, Direc *dir, char *(*cvt)(uchar*, int))
{
char *dot, *dotdot;
int m, n;
uchar buf[Blocksize], *ebuf, *p;
ulong b, nb;
Cdir *c;
Direc dx;
assert(dir->mode & DMDIR);
dot = atom(".");
dotdot = atom("..");
ebuf = buf+Blocksize;
nb = (dir->length+Blocksize-1) / Blocksize;
n = 0;
for(b=0; b<nb; b++) {
Creadblock(cd, buf, dir->block + b, Blocksize);
p = buf;
while(p < ebuf) {
c = (Cdir*)p;
if(c->len == 0)
break;
if(p+c->len > ebuf)
break;
if(parsedir(cd, &dx, p, ebuf-p, cvt) == 0 && dx.name != dot && dx.name != dotdot)
n++;
p += c->len;
}
}
m = (n+Ndirblock-1)/Ndirblock * Ndirblock;
dir->child = emalloc(m*sizeof dir->child[0]);
dir->nchild = n;
n = 0;
for(b=0; b<nb; b++) {
assert(n <= dir->nchild);
Creadblock(cd, buf, dir->block + b, Blocksize);
p = buf;
while(p < ebuf) {
c = (Cdir*)p;
if(c->len == 0)
break;
if(p+c->len > ebuf)
break;
if(parsedir(cd, &dx, p, ebuf-p, cvt) == 0 && dx.name != dot && dx.name != dotdot) {
assert(n < dir->nchild);
dir->child[n++] = dx;
}
p += c->len;
}
}
}
/*
* Free the children. Make sure their children are free too.
*/
void
freekids(Direc *dir)
{
int i;
for(i=0; i<dir->nchild; i++)
assert(dir->child[i].nchild == 0);
free(dir->child);
dir->child = nil;
dir->nchild = 0;
}
/*
* Add a whole directory and all its children to our binary tree.
*/
static void
adddir(Cdimg *cd, Dump *d, Direc *dir)
{
int i;
readkids(cd, dir, isostring);
for(i=0; i<dir->nchild; i++) {
if(dir->child[i].mode & DMDIR)
adddir(cd, d, &dir->child[i]);
else
addfile(cd, d, atom(dir->name), &dir->child[i]);
}
freekids(dir);
}
Dumpdir*
lookupmd5(Dump *d, uchar *md5)
{
return *ltreewalkmd5(&d->md5root, md5);
}
void
adddirx(Cdimg *cd, Dump *d, Direc *dir, int lev)
{
int i;
Direc dd;
if(lev == 2){
dd = *dir;
adddir(cd, d, &dd);
return;
}
for(i=0; i<dir->nchild; i++)
adddirx(cd, d, &dir->child[i], lev+1);
}
Dump*
dumpcd(Cdimg *cd, Direc *dir)
{
Dump *d;
d = emalloc(sizeof *d);
d->cd = cd;
adddirx(cd, d, dir, 0);
return d;
}
/*
static ulong
minblock(Direc *root, int lev)
{
int i;
ulong m, n;
m = root->block;
for(i=0; i<root->nchild; i++) {
n = minblock(&root->child[i], lev-1);
if(m > n)
m = n;
}
return m;
}
*/
void
copybutname(Direc *d, Direc *s)
{
Direc x;
x = *d;
*d = *s;
d->name = x.name;
d->confname = x.confname;
}
Direc*
createdumpdir(Direc *root, XDir *dir, char *utfname)
{
char *p;
Direc *d;
if(utfname[0]=='/')
sysfatal("bad dump name '%s'", utfname);
p = strchr(utfname, '/');
if(p == nil || strchr(p+1, '/'))
sysfatal("bad dump name '%s'", utfname);
*p++ = '\0';
if((d = walkdirec(root, utfname)) == nil)
d = adddirec(root, utfname, dir);
if(walkdirec(d, p))
sysfatal("duplicate dump name '%s/%s'", utfname, p);
d = adddirec(d, p, dir);
return d;
}
static void
rmdirec(Direc *d, Direc *kid)
{
Direc *ekid;
ekid = d->child+d->nchild;
assert(d->child <= kid && kid < ekid);
if(ekid != kid+1)
memmove(kid, kid+1, (ekid-(kid+1))*sizeof(*kid));
d->nchild--;
}
void
rmdumpdir(Direc *root, char *utfname)
{
char *p;
Direc *d, *dd;
if(utfname[0]=='/')
sysfatal("bad dump name '%s'", utfname);
p = strchr(utfname, '/');
if(p == nil || strchr(p+1, '/'))
sysfatal("bad dump name '%s'", utfname);
*p++ = '\0';
if((d = walkdirec(root, utfname)) == nil)
sysfatal("cannot remove %s/%s: %s does not exist", utfname, p, utfname);
p[-1] = '/';
if((dd = walkdirec(d, p)) == nil)
sysfatal("cannot remove %s: does not exist", utfname);
rmdirec(d, dd);
if(d->nchild == 0)
rmdirec(root, d);
}
char*
adddumpdir(Direc *root, ulong now, XDir *dir)
{
char buf[40], *p;
int n;
Direc *dday, *dyear;
Tm tm;
tm = *localtime(now);
sprint(buf, "%d", tm.year+1900);
if((dyear = walkdirec(root, buf)) == nil) {
dyear = adddirec(root, buf, dir);
assert(dyear != nil);
}
n = 0;
sprint(buf, "%.2d%.2d", tm.mon+1, tm.mday);
p = buf+strlen(buf);
while(walkdirec(dyear, buf))
sprint(p, "%d", ++n);
dday = adddirec(dyear, buf, dir);
assert(dday != nil);
sprint(buf, "%s/%s", dyear->name, dday->name);
assert(walkdirec(root, buf)==dday);
return atom(buf);
}
/*
* The dump directory tree is inferred from a linked list of special blocks.
* One block is written at the end of each dump.
* The blocks have the form
*
* plan 9 dump cd
* <dump-name> <dump-time> <next-block> <conform-block> <conform-length> \
* <iroot-block> <iroot-length> <jroot-block> <jroot-length>
*
* If only the first line is present, this is the end of the chain.
*/
static char magic[] = "plan 9 dump cd\n";
ulong
Cputdumpblock(Cdimg *cd)
{
uvlong x;
Cwseek(cd, (vlong)cd->nextblock * Blocksize);
x = Cwoffset(cd);
Cwrite(cd, magic, sizeof(magic)-1);
Cpadblock(cd);
return x/Blocksize;
}
int
hasdump(Cdimg *cd)
{
int i;
char buf[128];
for(i=16; i<24; i++) {
Creadblock(cd, buf, i, sizeof buf);
if(memcmp(buf, magic, sizeof(magic)-1) == 0)
return i;
}
return 0;
}
Direc
readdumpdirs(Cdimg *cd, XDir *dir, char *(*cvt)(uchar*, int))
{
char buf[Blocksize];
char *p, *q, *f[16];
int i, nf;
ulong db, t;
Direc *nr, root;
XDir xd;
mkdirec(&root, dir);
db = hasdump(cd);
xd = *dir;
for(;;){
if(db == 0)
sysfatal("error in dump blocks");
Creadblock(cd, buf, db, sizeof buf);
if(memcmp(buf, magic, sizeof(magic)-1) != 0)
break;
p = buf+sizeof(magic)-1;
if(p[0] == '\0')
break;
if((q = strchr(p, '\n')) != nil)
*q = '\0';
nf = tokenize(p, f, nelem(f));
i = 5;
if(nf < i || (cvt==jolietstring && nf < i+2))
sysfatal("error in dump block %lud: nf=%d; p='%s'", db, nf, p);
nr = createdumpdir(&root, &xd, f[0]);
t = strtoul(f[1], 0, 0);
xd.mtime = xd.ctime = xd.atime = t;
db = strtoul(f[2], 0, 0);
if(cvt == jolietstring)
i += 2;
nr->block = strtoul(f[i], 0, 0);
nr->length = strtoul(f[i+1], 0, 0);
}
cd->nulldump = db;
return root;
}
extern void addtx(char*, char*);
static int
isalldigit(char *s)
{
while(*s)
if(!isdigit(*s++))
return 0;
return 1;
}
void
readdumpconform(Cdimg *cd)
{
char buf[Blocksize];
char *p, *q, *f[10];
int nf;
ulong cb, nc, db;
uvlong m;
db = hasdump(cd);
assert(map==nil || map->nt == 0);
for(;;){
if(db == 0)
sysfatal("error0 in dump blocks");
Creadblock(cd, buf, db, sizeof buf);
if(memcmp(buf, magic, sizeof(magic)-1) != 0)
break;
p = buf+sizeof(magic)-1;
if(p[0] == '\0')
break;
if((q = strchr(p, '\n')) != nil)
*q = '\0';
nf = tokenize(p, f, nelem(f));
if(nf < 5)
sysfatal("error0 in dump block %lud", db);
db = strtoul(f[2], 0, 0);
cb = strtoul(f[3], 0, 0);
nc = strtoul(f[4], 0, 0);
Crseek(cd, (vlong)cb * Blocksize);
m = (vlong)cb * Blocksize + nc;
while(Croffset(cd) < m && (p = Crdline(cd, '\n')) != nil){
p[Clinelen(cd)-1] = '\0';
if(tokenize(p, f, 2) != 2 || (f[0][0] != 'D' && f[0][0] != 'F')
|| strlen(f[0]) != 7 || !isalldigit(f[0]+1))
break;
addtx(atom(f[1]), atom(f[0]));
}
}
if(map)
cd->nconform = map->nt;
else
cd->nconform = 0;
}