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#include "stdinc.h"
#include "vac.h"
#include "dat.h"
#include "fns.h"
static char EBadVacFormat[] = "bad format for vac file";
static VacFs *
vacfsalloc(VtConn *z, int bsize, int ncache, int mode)
{
VacFs *fs;
fs = vtmallocz(sizeof(VacFs));
fs->ref = 1;
fs->z = z;
fs->bsize = bsize;
fs->cache = vtcachealloc(z, bsize, ncache, mode);
return fs;
}
static int
readscore(int fd, uchar score[VtScoreSize])
{
char buf[45], *pref;
int n;
n = readn(fd, buf, sizeof(buf)-1);
if(n < sizeof(buf)) {
werrstr("short read");
return -1;
}
buf[n] = 0;
if(vtparsescore(buf, &pref, score) < 0){
werrstr(EBadVacFormat);
return -1;
}
if(pref==nil || strcmp(pref, "vac") != 0) {
werrstr("not a vac file");
return -1;
}
return 0;
}
VacFs*
vacfsopen(VtConn *z, char *file, int mode, int ncache)
{
int fd;
uchar score[VtScoreSize];
fd = open(file, OREAD);
if(fd < 0)
return nil;
if(readscore(fd, score) < 0){
close(fd);
return nil;
}
close(fd);
return vacfsopenscore(z, score, mode, ncache);
}
VacFs*
vacfsopenscore(VtConn *z, u8int *score, int mode, int ncache)
{
VacFs *fs;
int n;
VtRoot rt;
uchar buf[VtRootSize];
VacFile *root;
VtFile *r;
VtEntry e;
n = vtread(z, score, VtRootType, buf, VtRootSize);
if(n < 0)
return nil;
if(n != VtRootSize){
werrstr("vtread on root too short");
return nil;
}
if(vtrootunpack(&rt, buf) < 0)
return nil;
if(strcmp(rt.type, "vac") != 0) {
werrstr("not a vac root");
return nil;
}
fs = vacfsalloc(z, rt.blocksize, ncache, mode);
memmove(fs->score, score, VtScoreSize);
fs->mode = mode;
memmove(e.score, score, VtScoreSize);
e.gen = 0;
e.psize = (rt.blocksize/VtEntrySize)*VtEntrySize;
e.dsize = rt.blocksize;
e.type = VtDirType;
e.flags = VtEntryActive;
e.size = 3*VtEntrySize;
root = nil;
if((r = vtfileopenroot(fs->cache, &e)) == nil)
goto Err;
root = _vacfileroot(fs, r);
vtfileclose(r);
if(root == nil)
goto Err;
fs->root = root;
return fs;
Err:
if(root)
vacfiledecref(root);
vacfsclose(fs);
return nil;
}
VacFs *
vacfscreate(VtConn *z, int bsize, int ncache)
{
return vacfsalloc(z, bsize, ncache, VtORDWR);
}
int
vacfsmode(VacFs *fs)
{
return fs->mode;
}
VacFile*
vacfsgetroot(VacFs *fs)
{
return vacfileincref(fs->root);
}
int
vacfsgetblocksize(VacFs *fs)
{
return fs->bsize;
}
int
vacfsgetscore(VacFs *fs, u8int *score)
{
memmove(score, fs->score, VtScoreSize);
return 0;
}
int
_vacfsnextqid(VacFs *fs, uvlong *qid)
{
++fs->qid;
*qid = fs->qid;
return 0;
}
int
vacfssync(VacFs *fs)
{
return 0;
}
void
vacfsclose(VacFs *fs)
{
if(fs->root)
vacfiledecref(fs->root);
fs->root = nil;
vtcachefree(fs->cache);
vtfree(fs);
}
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