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#include <u.h>
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#include <libc.h>
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#include <venti.h>
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#include "cvt.h"
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static int
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checksize(int n)
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{
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	if(n < 256 || n > VtMaxLumpSize) {
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		werrstr("bad block size");
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		return -1;
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	}
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	return 0;
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}
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void
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vtrootpack(VtRoot *r, uchar *p)
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{
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	uchar *op = p;
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	U16PUT(p, VtRootVersion);
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	p += 2;
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	memmove(p, r->name, sizeof(r->name));
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	p += sizeof(r->name);
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	memmove(p, r->type, sizeof(r->type));
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	p += sizeof(r->type);
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	memmove(p, r->score, VtScoreSize);
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	p +=  VtScoreSize;
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	U16PUT(p, r->blocksize);
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	p += 2;
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	memmove(p, r->prev, VtScoreSize);
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	p += VtScoreSize;
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	assert(p-op == VtRootSize);
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}
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int
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vtrootunpack(VtRoot *r, uchar *p)
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{
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	uchar *op = p;
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	uint vers;
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	memset(r, 0, sizeof(*r));
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	vers = U16GET(p);
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	if(vers != VtRootVersion) {
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		werrstr("unknown root version");
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		return -1;
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	}
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	p += 2;
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	memmove(r->name, p, sizeof(r->name));
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	r->name[sizeof(r->name)-1] = 0;
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	p += sizeof(r->name);
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	memmove(r->type, p, sizeof(r->type));
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	r->type[sizeof(r->type)-1] = 0;
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	p += sizeof(r->type);
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	memmove(r->score, p, VtScoreSize);
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	p +=  VtScoreSize;
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	r->blocksize = U16GET(p);
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	if(checksize(r->blocksize) < 0)
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		return -1;
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	p += 2;
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	memmove(r->prev, p, VtScoreSize);
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	p += VtScoreSize;
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	assert(p-op == VtRootSize);
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	return 0;
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}