venti updates

src/libventi/cache.c

diff --git a/src/libventi/cache.c b/src/libventi/cache.c
index 09ca5ea..71bdb62 100644
--- a/src/libventi/cache.c
+++ b/src/libventi/cache.c
@@ -311,11 +311,13 @@
 {
 	VtBlock *b;
 
-	if(addr >= c->nblock)
-		sysfatal("vtcachelocal: asked for block #%ud; only %d blocks\n",
+	if(addr == 0)
+		sysfatal("vtcachelocal: asked for nonexistent block 0");
+	if(addr > c->nblock)
+		sysfatal("vtcachelocal: asked for block #%ud; only %d blocks",
 			addr, c->nblock);
 
-	b = &c->block[addr];
+	b = &c->block[addr-1];
 	if(b->addr == NilBlock || b->iostate != BioLocal)
 		sysfatal("vtcachelocal: block is not local");
 
@@ -340,7 +342,7 @@
 	b = vtcachebumpblock(c);
 	b->iostate = BioLocal;
 	b->type = type;
-	b->addr = b - c->block;
+	b->addr = (b - c->block)+1;
 	vtzeroextend(type, b->data, 0, c->blocksize);
 	vtlocaltoglobal(b->addr, b->score);
 	qunlock(&c->lk);

src/libventi/entry.c

diff --git a/src/libventi/entry.c b/src/libventi/entry.c
index ca1d200..aeb8dad 100644
--- a/src/libventi/entry.c
+++ b/src/libventi/entry.c
@@ -7,7 +7,7 @@
 checksize(int n)
 {
 	if(n < 256 || n > VtMaxLumpSize) {
-		werrstr("bad block size");
+		werrstr("bad block size %#ux", n);
 		return -1;
 	}
 	return 0;
@@ -77,6 +77,16 @@
 	if(!(e->flags & VtEntryActive))
 		return 0;
 
+	/* 
+	 * Some old vac files use psize==0 and dsize==0 when the
+	 * file itself has size 0 or is zeros.  Just to make programs not
+	 * have to figure out what block sizes of 0 means, rewrite them.
+	 */
+	if(e->psize == 0 && e->dsize == 0
+	&& memcmp(e->score, vtzeroscore, VtScoreSize) == 0){
+		e->psize = 4096;
+		e->dsize = 4096;
+	}
 	if(checksize(e->psize) < 0 || checksize(e->dsize) < 0)
 		return -1;
 

src/libventi/file.c

diff --git a/src/libventi/file.c b/src/libventi/file.c
index 89b307c..9b25011 100644
--- a/src/libventi/file.c
+++ b/src/libventi/file.c
@@ -18,7 +18,6 @@
 
 #define MaxBlock (1UL<<31)
 
-static char EBadEntry[] = "bad VtEntry";
 static char ENotDir[] = "walk in non-directory";
 static char ETooBig[] = "file too big";
 /* static char EBadAddr[] = "bad address"; */
@@ -49,8 +48,10 @@
 	}else
 		epb = p->dsize / VtEntrySize;
 
-	if(b->type != VtDirType)
-		goto Bad;
+	if(b->type != VtDirType){
+		werrstr("bad block type %#uo", b->type);
+		return nil;
+	}
 
 	/*
 	 * a non-active entry is the only thing that
@@ -58,28 +59,26 @@
 	 * get prints.
 	 */
 	if(vtentryunpack(&e, b->data, offset % epb) < 0){
-		fprint(2, "vtentryunpack failed\n");
-		goto Bad;
+		fprint(2, "vtentryunpack failed: %r (%.*H)\n", VtEntrySize, b->data+VtEntrySize*(offset%epb));
+		return nil;
 	}
 	if(!(e.flags & VtEntryActive)){
-		if(0)fprint(2, "not active\n");
-		goto Bad;
-	}
-	if(e.psize < 256 || e.dsize < 256){
-		fprint(2, "psize %ud dsize %ud\n", e.psize, e.dsize);
-		goto Bad;
+		werrstr("entry not active");
+		return nil;
 	}
 
 	if(DEPTH(e.type) < sizetodepth(e.size, e.psize, e.dsize)){
 		fprint(2, "depth %ud size %llud psize %ud dsize %ud\n",
 			DEPTH(e.type), e.size, e.psize, e.dsize);
-		goto Bad;
+		werrstr("bad depth");
+		return nil;
 	}
 
 	size = vtcacheblocksize(c);
 	if(e.dsize > size || e.psize > size){
-		fprint(2, "psize %ud dsize %ud blocksize %ud\n", e.psize, e.dsize, size);
-		goto Bad;
+		werrstr("block sizes %ud, %ud bigger than cache block size %ud",
+			e.psize, e.dsize, size);
+		return nil;
 	}
 
 	r = vtmallocz(sizeof(VtFile));
@@ -105,10 +104,6 @@
 	r->epb = epb;
 
 	return r;
-Bad:
-	werrstr(EBadEntry);
-	return nil;
-	
 }
 
 VtFile *
@@ -178,17 +173,23 @@
 	return r;
 }
 
-VtFile *
+VtFile*
 vtfilecreate(VtFile *r, int psize, int dsize, int type)
 {
+	return _vtfilecreate(r, -1, psize, dsize, type);
+}
+
+VtFile*
+_vtfilecreate(VtFile *r, int o, int psize, int dsize, int type)
+{
 	int i;
 	VtBlock *b;
 	u32int bn, size;
 	VtEntry e;
 	int epb;
 	VtFile *rr;
- 	u32int offset;
-
+	u32int offset;
+	
 	assert(ISLOCKED(r));
 	assert(psize <= VtMaxLumpSize);
 	assert(dsize <= VtMaxLumpSize);
@@ -205,8 +206,11 @@
 	/*
 	 * look at a random block to see if we can find an empty entry
 	 */
-	offset = lnrand(size+1);
-	offset -= offset % epb;
+	if(o == -1){
+		offset = lnrand(size+1);
+		offset -= offset % epb;
+	}else
+		offset = o;
 
 	/* try the given block and then try the last block */
 	for(;;){