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#include <u.h>
#include <libc.h>
#include <oventi.h>
/*
* integer conversion routines
*/
#define U8GET(p) ((p)[0])
#define U16GET(p) (((p)[0]<<8)|(p)[1])
#define U32GET(p) ((u32int)(((p)[0]<<24)|((p)[1]<<16)|((p)[2]<<8)|(p)[3]))
#define U48GET(p) (((vlong)U16GET(p)<<32)|(vlong)U32GET((p)+2))
#define U64GET(p) (((vlong)U32GET(p)<<32)|(vlong)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)
static int
checkSize(int n)
{
if(n < 256 || n > VtMaxLumpSize) {
vtSetError("bad block size");
return 0;
}
return 1;
}
void
vtRootPack(VtRoot *r, uchar *p)
{
uchar *op = p;
U16PUT(p, r->version);
p += 2;
memmove(p, r->name, sizeof(r->name));
p += sizeof(r->name);
memmove(p, r->type, sizeof(r->type));
p += sizeof(r->type);
memmove(p, r->score, VtScoreSize);
p += VtScoreSize;
U16PUT(p, r->blockSize);
p += 2;
memmove(p, r->prev, VtScoreSize);
p += VtScoreSize;
assert(p-op == VtRootSize);
}
int
vtRootUnpack(VtRoot *r, uchar *p)
{
uchar *op = p;
memset(r, 0, sizeof(*r));
r->version = U16GET(p);
if(r->version != VtRootVersion) {
vtSetError("unknown root version");
return 0;
}
p += 2;
memmove(r->name, p, sizeof(r->name));
r->name[sizeof(r->name)-1] = 0;
p += sizeof(r->name);
memmove(r->type, p, sizeof(r->type));
r->type[sizeof(r->type)-1] = 0;
p += sizeof(r->type);
memmove(r->score, p, VtScoreSize);
p += VtScoreSize;
r->blockSize = U16GET(p);
if(!checkSize(r->blockSize))
return 0;
p += 2;
memmove(r->prev, p, VtScoreSize);
p += VtScoreSize;
assert(p-op == VtRootSize);
return 1;
}
void
vtEntryPack(VtEntry *e, uchar *p, int index)
{
ulong t32;
int flags;
uchar *op;
p += index * VtEntrySize;
op = p;
U32PUT(p, e->gen);
p += 4;
U16PUT(p, e->psize);
p += 2;
U16PUT(p, e->dsize);
p += 2;
flags = e->flags | ((e->depth << VtEntryDepthShift) & VtEntryDepthMask);
U8PUT(p, flags);
p++;
memset(p, 0, 5);
p += 5;
U48PUT(p, e->size, t32);
p += 6;
memmove(p, e->score, VtScoreSize);
p += VtScoreSize;
assert(p-op == VtEntrySize);
}
int
vtEntryUnpack(VtEntry *e, uchar *p, int index)
{
uchar *op;
p += index * VtEntrySize;
op = p;
e->gen = U32GET(p);
p += 4;
e->psize = U16GET(p);
p += 2;
e->dsize = U16GET(p);
p += 2;
e->flags = U8GET(p);
e->depth = (e->flags & VtEntryDepthMask) >> VtEntryDepthShift;
e->flags &= ~VtEntryDepthMask;
p++;
p += 5;
e->size = U48GET(p);
p += 6;
memmove(e->score, p, VtScoreSize);
p += VtScoreSize;
assert(p-op == VtEntrySize);
if(!(e->flags & VtEntryActive))
return 1;
if(!checkSize(e->psize) || !checkSize(e->dsize))
return 0;
return 1;
}
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