docs

[pspp] / src / data / sys-file-private.h

diff --git a/src/data/sys-file-private.h b/src/data/sys-file-private.h
index 1eee77950fb7acd892f7f737c8e802f9367b27ef..a39b0c1aa304c5774f729151eabf5973ef1e7c6e 100644 (file)
--- a/src/data/sys-file-private.h
+++ b/src/data/sys-file-private.h
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2006-2007, 2009-2013 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -35,6 +35,19 @@
 
 struct dictionary;
 
+/* ASCII magic numbers. */
+#define ASCII_MAGIC  "$FL2"     /* For regular files. */
+#define ASCII_ZMAGIC "$FL3"     /* For ZLIB compressed files. */
+
+/* EBCDIC magic number, the same as ASCII_MAGIC but encoded in EBCDIC.
+
+   No EBCDIC ZLIB compressed files have been observed, so we do not define
+   EBCDIC_ZMAGIC even though the value is obvious. */
+#define EBCDIC_MAGIC "\x5b\xc6\xd3\xf2"
+
+/* Amount of data that ZLIB compressed data blocks typically decompress to. */
+#define ZBLOCK_SIZE 0x3ff000
+
 /* A variable in a system file. */
 struct sfm_var
   {