new venti library.
diff --git a/src/libventi/entry.c b/src/libventi/entry.c
new file mode 100644
index 0000000..59c09e9
--- /dev/null
+++ b/src/libventi/entry.c
@@ -0,0 +1,85 @@
+#include <u.h>
+#include <libc.h>
+#include <venti.h>
+#include "cvt.h"
+
+static int
+checksize(int n)
+{
+ if(n < 256 || n > VtMaxLumpSize) {
+ werrstr("bad block size");
+ return -1;
+ }
+ return 0;
+}
+
+void
+vtentrypack(VtEntry *e, uchar *p, int index)
+{
+ ulong t32;
+ int flags;
+ uchar *op;
+ int depth;
+
+ p += index * VtEntrySize;
+ op = p;
+
+ U32PUT(p, e->gen);
+ p += 4;
+ U16PUT(p, e->psize);
+ p += 2;
+ U16PUT(p, e->dsize);
+ p += 2;
+ depth = e->type&VtTypeDepthMask;
+ flags = (e->flags&~(VtEntryDir|VtEntryDepthShift));
+ flags |= depth << VtEntryDepthShift;
+ if(e->type - depth == VtEntryDir)
+ flags |= VtEntryDir;
+ 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->type = (e->flags&VtEntryDir) ? VtDirType : VtDataType;
+ e->type += (e->flags & VtEntryDepthMask) >> VtEntryDepthShift;
+ e->flags &= ~(VtEntryDir|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 0;
+
+ if(checksize(e->psize) < 0 || checksize(e->dsize) < 0)
+ return -1;
+
+ return 0;
+}
+
