Subversion Repositories planix.SVN

#include "stdinc.h"
#include "dat.h"
#include "fns.h"
#include "error.h"

/*
 * integer conversion routines
 */
#define U8GET(p)        ((p)[0])
#define U16GET(p)       (((p)[0]<<8)|(p)[1])
#define U32GET(p)       (((p)[0]<<24)|((p)[1]<<16)|((p)[2]<<8)|(p)[3])
#define U48GET(p)       (((uvlong)U16GET(p)<<32)|(uvlong)U32GET((p)+2))
#define U64GET(p)       (((uvlong)U32GET(p)<<32)|(uvlong)U32GET((p)+4))

#define U8PUT(p,v)      (p)[0]=(v)
#define U16PUT(p,v)     (p)[0]=(v)>>8;(p)[1]=(v)
#define U32PUT(p,v)     (p)[0]=(v)>>24;(p)[1]=(v)>>16;(p)[2]=(v)>>8;(p)[3]=(v)
#define U48PUT(p,v,t32) t32=(v)>>32;U16PUT(p,t32);t32=(v);U32PUT((p)+2,t32)
#define U64PUT(p,v,t32) t32=(v)>>32;U32PUT(p,t32);t32=(v);U32PUT((p)+4,t32)

void
headerPack(Header *h, uchar *p)
{
        memset(p, 0, HeaderSize);
        U32PUT(p, HeaderMagic);
        U16PUT(p+4, HeaderVersion);
        U16PUT(p+6, h->blockSize);
        U32PUT(p+8, h->super);
        U32PUT(p+12, h->label);
        U32PUT(p+16, h->data);
        U32PUT(p+20, h->end);
}

int
headerUnpack(Header *h, uchar *p)
{
        if(U32GET(p) != HeaderMagic){
                vtSetError("vac header bad magic");
                return 0;
        }
        h->version = U16GET(p+4);
        if(h->version != HeaderVersion){
                vtSetError("vac header bad version");
                return 0;
        }
        h->blockSize = U16GET(p+6);
        h->super = U32GET(p+8);
        h->label = U32GET(p+12);
        h->data = U32GET(p+16);
        h->end = U32GET(p+20);
        return 1;
}

void
labelPack(Label *l, uchar *p, int i)
{
        p += i*LabelSize;
        U8PUT(p, l->state);
        U8PUT(p+1, l->type);
        U32PUT(p+2, l->epoch);
        U32PUT(p+6, l->epochClose);
        U32PUT(p+10, l->tag);
}

int
labelUnpack(Label *l, uchar *p, int i)
{
        p += i*LabelSize;
        l->state = p[0];
        l->type = p[1];
        l->epoch = U32GET(p+2);
        l->epochClose = U32GET(p+6);
        l->tag = U32GET(p+10);

        if(l->type > BtMax){
Bad:
                vtSetError(EBadLabel);
                fprint(2, "%s: labelUnpack: bad label: 0x%.2ux 0x%.2ux 0x%.8ux "
                        "0x%.8ux 0x%.8ux\n", argv0, l->state, l->type, l->epoch,
                        l->epochClose, l->tag);
                return 0;
        }
        if(l->state != BsBad && l->state != BsFree){
                if(!(l->state&BsAlloc) || l->state & ~BsMask)
                        goto Bad;
                if(l->state&BsClosed){
                        if(l->epochClose == ~(u32int)0)
                                goto Bad;
                }else{
                        if(l->epochClose != ~(u32int)0)
                                goto Bad;
                }
        }
        return 1;
}

u32int
globalToLocal(uchar score[VtScoreSize])
{
        int i;

        for(i=0; i<VtScoreSize-4; i++)
                if(score[i] != 0)
                        return NilBlock;

        return U32GET(score+VtScoreSize-4);
}

void
localToGlobal(u32int addr, uchar score[VtScoreSize])
{
        memset(score, 0, VtScoreSize-4);
        U32PUT(score+VtScoreSize-4, addr);
}

void
entryPack(Entry *e, uchar *p, int index)
{
        ulong t32;
        int flags;

        p += index * VtEntrySize;

        U32PUT(p, e->gen);
        U16PUT(p+4, e->psize);
        U16PUT(p+6, e->dsize);
        flags = e->flags | ((e->depth << VtEntryDepthShift) & VtEntryDepthMask);
        U8PUT(p+8, flags);
        memset(p+9, 0, 5);
        U48PUT(p+14, e->size, t32);

        if(flags & VtEntryLocal){
                if(globalToLocal(e->score) == NilBlock)
                        abort();
                memset(p+20, 0, 7);
                U8PUT(p+27, e->archive);
                U32PUT(p+28, e->snap);
                U32PUT(p+32, e->tag);
                memmove(p+36, e->score+16, 4);
        }else
                memmove(p+20, e->score, VtScoreSize);
}

int
entryUnpack(Entry *e, uchar *p, int index)
{
        p += index * VtEntrySize;

        e->gen = U32GET(p);
        e->psize = U16GET(p+4);
        e->dsize = U16GET(p+6);
        e->flags = U8GET(p+8);
        e->depth = (e->flags & VtEntryDepthMask) >> VtEntryDepthShift;
        e->flags &= ~VtEntryDepthMask;
        e->size = U48GET(p+14);

        if(e->flags & VtEntryLocal){
                e->archive = p[27];
                e->snap = U32GET(p+28);
                e->tag = U32GET(p+32);
                memset(e->score, 0, 16);
                memmove(e->score+16, p+36, 4);
        }else{
                e->archive = 0;
                e->snap = 0;
                e->tag = 0;
                memmove(e->score, p+20, VtScoreSize);
        }

        return 1;
}

int
entryType(Entry *e)
{
        return (((e->flags & VtEntryDir) != 0) << 3) | e->depth;
}


void
superPack(Super *s, uchar *p)
{
        u32int t32;

        memset(p, 0, SuperSize);
        U32PUT(p, SuperMagic);
        assert(s->version == SuperVersion);
        U16PUT(p+4, s->version);
        U32PUT(p+6, s->epochLow);
        U32PUT(p+10, s->epochHigh);
        U64PUT(p+14, s->qid, t32);
        U32PUT(p+22, s->active);
        U32PUT(p+26, s->next);
        U32PUT(p+30, s->current);
        memmove(p+34, s->last, VtScoreSize);
        memmove(p+54, s->name, sizeof(s->name));
}

int
superUnpack(Super *s, uchar *p)
{
        memset(s, 0, sizeof(*s));
        if(U32GET(p) != SuperMagic)
                goto Err;
        s->version = U16GET(p+4);
        if(s->version != SuperVersion)
                goto Err;
        s->epochLow = U32GET(p+6);
        s->epochHigh = U32GET(p+10);
        s->qid = U64GET(p+14);
        if(s->epochLow == 0 || s->epochLow > s->epochHigh || s->qid == 0)
                goto Err;
        s->active = U32GET(p+22);
        s->next = U32GET(p+26);
        s->current = U32GET(p+30);
        memmove(s->last, p+34, VtScoreSize);
        memmove(s->name, p+54, sizeof(s->name));
        s->name[sizeof(s->name)-1] = 0;
        return 1;
Err:
        memset(s, 0, sizeof(*s));
        vtSetError(EBadSuper);
        return 0;
}