ref: 99c900d718ea1343036656b7384af56bcad2f28f
dir: /pack.c/
#include <u.h>
#include <libc.h>
#include <fcall.h>
#include <avl.h>
#include <bio.h>
#include "dat.h"
#include "fns.h"
char*
unpack8(int *err, char *p, char *e, void *v)
{
if (e - p < 1 || *err){
*err = 1;
return p;
}
*(uchar*)v = p[0];
return p+1;
}
char*
unpack16(int *err, char *p, char *e, void *v)
{
if (e - p < 2 || *err){
*err = 1;
return p;
}
*(ushort*)v = GBIT16(p);
return p+2;
}
char*
unpack32(int *err, char *p, char *e, void *v)
{
if (e - p < 4 || *err){
*err = 1;
return p;
}
*(uint*)v = GBIT32(p);
return p+4;
}
char*
unpack64(int *err, char *p, char *e, void *v)
{
if (e - p < 8 || *err){
*err = 1;
return p;
}
*(uvlong*)v = GBIT64(p);
return p+8;
}
/* Terminated so we can use them directly in C */
char*
unpackstr(int *err, char *p, char *e, char **s)
{
int n;
if (e - p < 3 || *err){
*err = 1;
return p;
}
n = GBIT16(p);
if(e - p < n + 3 || p[n+2] != 0){
*err = 1;
return p;
}
*s = p+2;
return p+3+n;
}
char*
pack8(int *err, char *p, char *e, uchar v)
{
if (e - p < 1 || *err){
*err = 1;
return p;
}
p[0] = v;
return p+1;
}
char*
pack16(int *err, char *p, char *e, ushort v)
{
if (e - p < 2 || *err){
*err = 1;
return p;
}
PBIT16(p, v);
return p+2;
}
char*
pack32(int *err, char *p, char *e, uint v)
{
if (e - p < 4 || *err){
*err = 1;
return p;
}
PBIT32(p, v);
return p+4;
}
char*
pack64(int *err, char *p, char *e, uvlong v)
{
if (e - p < 8 || *err){
*err = 1;
return p;
}
PBIT64(p, v);
return p+8;
}
/* Terminated so we can use them directly in C */
char*
packstr(int *err, char *p, char *e, char *s)
{
int n;
n = strlen(s);
if (e - p < n+3 || *err){
*err = 1;
return p;
}
PBIT16(p+0, n);
memcpy(p+2, s, n);
p[2+n] = 0;
return p+3+n;
}
int
dir2kv(vlong up, Dir *d, Kvp *kv, char *buf, int nbuf)
{
char *k, *ek, *v, *ev, *eb;
int err;
err = 0;
k = buf;
ek = buf;
eb = buf + nbuf;
ek = pack8(&err, ek, eb, Kent);
ek = pack64(&err, ek, eb, up);
ek = packstr(&err, ek, eb, d->name);
v = ek;
ev = ek;
ev = pack64(&err, ev, eb, d->qid.path);
ev = pack32(&err, ev, eb, d->qid.vers);
ev = pack8(&err, ev, eb, d->qid.type);
ev = pack32(&err, ev, eb, d->mode);
ev = pack64(&err, ev, eb, (vlong)d->atime*Nsec);
ev = pack64(&err, ev, eb, (vlong)d->mtime*Nsec);
ev = pack64(&err, ev, eb, d->length);
ev = packstr(&err, ev, eb, d->uid);
ev = packstr(&err, ev, eb, d->gid);
ev = packstr(&err, ev, eb, d->muid);
if(err){
werrstr("stat too big: %.*s...", 32, d->name);
return -1;
}
kv->k = k;
kv->nk = ek - k;
kv->v = v;
kv->nv = ev - v;
return 0;
}
int
name2dkey(vlong up, char *name, Key *k, char *buf, int nbuf)
{
char *ek, *eb;
int err;
err = 0;
ek = buf;
eb = buf + nbuf;
ek = pack8(&err, ek, eb, Kent);
ek = pack64(&err, ek, eb, up);
ek = packstr(&err, ek, eb, name);
if(err)
return -1;
k->k = buf;
k->nk = ek - buf;
return k->nk;
}
int
kv2dir(Kvp *kv, Dir *d)
{
char *k, *ek, *v, *ev;
vlong atime, mtime;
int err;
memset(d, 0, sizeof(Dir));
err = 0;
k = kv->k + 9;
ek = kv->k + kv->nk;
k = unpackstr(&err, k, ek, &d->name);
if(err){
werrstr("key too small [%d]", kv->nk);
return -1;
}
v = kv->v;
ev = v + kv->nv;
v = unpack64(&err, v, ev, &d->qid.path);
v = unpack32(&err, v, ev, &d->qid.vers);
v = unpack8(&err, v, ev, &d->qid.type);
v = unpack32(&err, v, ev, &d->mode);
v = unpack64(&err, v, ev, &atime);
v = unpack64(&err, v, ev, &mtime);
v = unpack64(&err, v, ev, &d->length);
v = unpackstr(&err, v, ev, &d->uid);
v = unpackstr(&err, v, ev, &d->gid);
v = unpackstr(&err, v, ev, &d->muid);
if(err){
// print("fucked: %P\n", kv);
werrstr("val too small [%s]", d->name);
return -1;
}
if(k != ek){
werrstr("invalid path");
return -1;
}
if(v != ev){
werrstr("stat full of fuck");
return -1;
}
d->atime = (atime+Nsec/2)/Nsec;
d->mtime = (mtime+Nsec/2)/Nsec;
return 0;
}
int
kv2statbuf(Kvp *kv, char *buf, int nbuf)
{
Dir d;
int n;
if(kv2dir(kv, &d) == -1)
return -1;
if((n = convD2M(&d, (uchar*)buf, nbuf)) <= BIT16SZ)
return -1;
return n;
}
int
kv2qid(Kvp *kv, Qid *q)
{
char *v, *ev;
int err;
err = 0;
v = kv->v;
ev = v + kv->nv;
v = unpack64(&err, v, ev, &q->path);
v = unpack32(&err, v, ev, &q->vers);
unpack8(&err, v, ev, &q->type);
if(err){
werrstr("kv too small");
return -1;
}
return 0;
}
char*
packbp(char *p, int sz, Bptr *bp)
{
assert(sz >= Ptrsz);
PBIT64(p, bp->addr); p += 8;
PBIT64(p, bp->hash); p += 8;
PBIT64(p, bp->gen); p += 8;
return p;
}
Bptr
unpackbp(char *p, int sz)
{
Bptr bp;
assert(sz >= Ptrsz);
bp.addr = GBIT64(p); p += 8;
bp.hash = GBIT64(p); p += 8;
bp.gen = GBIT64(p);
return bp;
}
char*
packdkey(char *p, int sz, vlong up, char *name)
{
char *ep;
int err;
err = 0;
ep = p + sz;
p = pack8(&err, p, ep, Kent);
p = pack64(&err, p, ep, up);
p = packstr(&err, p, ep, name);
if(err)
return 0;
return p;
}
Tree*
unpacktree(Tree *t, char *p, int sz)
{
int i, j;
Bptr bp;
Blk *b;
assert(sz >= Treesz);
memset(t, 0, sizeof(Tree));
t->ref = GBIT32(p); p += 4;
t->ht = GBIT32(p); p += 4;
t->bp.addr = GBIT64(p); p += 8;
t->bp.hash = GBIT64(p); p += 8;
t->bp.gen = GBIT64(p); p += 8;
for(i = 0; i < Ndead; i++){
t->prev[i] = GBIT64(p); p += 8;
t->dead[i].head = GBIT64(p); p += 8;
t->dead[i].hash = GBIT64(p); p += 8;
bp.addr = GBIT64(p); p += 8;
bp.hash = GBIT64(p); p += 8;
bp.gen = -1;
if(bp.addr == -1)
continue;
if((b = getblk(bp, 0)) == nil){
for(j = 0; j < i; j++)
putblk(t->dead[j].tail);
return nil;
}
t->dead[i].tail = b;
cacheblk(b);
}
return t;
}
char*
packtree(char *p, int sz, Tree *t)
{
vlong tladdr, tlhash;
Blk *tl;
int i;
assert(sz >= Treesz);
PBIT32(p, t->ref); p += 4;
PBIT32(p, t->ht); p += 4;
PBIT64(p, t->bp.addr); p += 8;
PBIT64(p, t->bp.hash); p += 8;
PBIT64(p, t->bp.gen); p += 8;
for(i = 0; i < Ndead; i++){
tladdr = -1;
tlhash = -1;
if(t->dead[i].tail != nil){
tl = t->dead[i].tail;
lock(tl);
assert(tl->flag & Bfinal);
unlock(tl);
tladdr = tl->bp.addr;
tlhash = tl->bp.hash;
}
PBIT64(p, t->prev[i]); p += 8;
PBIT64(p, t->dead[i].head); p += 8;
PBIT64(p, t->dead[i].hash); p += 8;
PBIT64(p, tladdr); p += 8;
PBIT64(p, tlhash); p += 8;
}
return p;
}