From 8c0d692125018052fa228721f30f760dfb0c0adf Mon Sep 17 00:00:00 2001
From: Patrick Lam <plam@MIT.EDU>
Date: Thu, 16 Feb 2006 17:50:04 +0000
Subject: [PATCH] Deal correctly with changing FC_CACHE_MAGIC.

---
 ChangeLog     |  5 +++++
 src/fccache.c | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 7da4745..220470a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-02-16  Patrick Lam  <plam@mit.edu>
+	* src/fccache.c (FcDirCacheHasCurrentArch):
+
+	Deal correctly with changing FC_CACHE_MAGIC.
+
 2006-02-16  Patrick Lam  <plam@mit.edu>
 	* fc-cache/fc-cache.c (usage, scanDirs, main):
 
diff --git a/src/fccache.c b/src/fccache.c
index fa70516..6385d3f 100644
--- a/src/fccache.c
+++ b/src/fccache.c
@@ -759,6 +759,7 @@ FcDirCacheHasCurrentArch (const FcChar8 *dir)
     int 	fd;
     off_t	current_arch_start;
     char 	*current_arch_machine_name;
+    FcCache	metadata;
 
     fd = FcDirCacheOpen (dir);
     if (fd < 0)
@@ -766,6 +767,22 @@ FcDirCacheHasCurrentArch (const FcChar8 *dir)
 
     current_arch_machine_name = FcCacheMachineSignature();
     current_arch_start = FcCacheSkipToArch(fd, current_arch_machine_name);
+
+    if (current_arch_start >= 0)
+    {
+        if (read(fd, &metadata, sizeof(FcCache)) != sizeof(FcCache))
+        {
+            close (fd);
+            return FcFalse;
+        }
+
+        if (metadata.magic != FC_CACHE_MAGIC)
+        {
+            close (fd);
+            return FcFalse;
+        }
+    }
+
     close (fd);
 
     if (current_arch_start < 0)