gentoo-overlay/media-video/vamps/files/vamps-0.99.2-premature-eof.patch

--- vamps-0.99.2/vamps/vamps.c.orig	2006-04-15 08:00:07.000000000 -0400
+++ vamps-0.99.2/vamps/vamps.c	2007-01-26 06:54:27.000000000 -0500
@@ -18,6 +18,9 @@
 //
 // Revision history (latest first):
 //
+// 2007/01/26: V0.99.3: Fixed assumptions in lock() which do not hold for pipes.
+//                      This cures the "Premature EOF" problem.
+//
 // 2006/04/15: V0.99.2: Fixed some signed/unsigned issues which caused compiler
 //                      warnings on some platforms. No funtional changes.
 //
@@ -396,13 +399,24 @@
     rhwp = rptr + avail;
   }
 
-  n = read (0, rhwp, RBUF_SIZE - avail);
-
-  if (n % SECT_SIZE)
-    fatal ("Premature EOF");
-
-  rhwp       += n;
-  bytes_read += n;
+  while (avail < size)  
+  {
+    // read; reads from an open pipe will return any non-zero amount of data
+    //       (not necessarily the amount we wanted!)
+    n = read (0, rhwp, RBUF_SIZE - avail);
+    if (!n)
+    {
+      if (avail % SECT_SIZE)
+        // we got an EOF and only a partial sector
+        fatal ("Premature EOF");
+      break;
+    }
+    else if (n == -1)
+      fatal ("Read from stdin: %s", strerror (errno));
+    rhwp       += n;
+    bytes_read += n;
+    avail      += n;
+  }
 
   return !n;
 }