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 e839cd6ac02008ab5fec2ee08feffcfbdcad003f..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 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
   {
@@ -60,4 +73,17 @@ int sfm_width_to_segments (int width);
 int sfm_segment_effective_offset (int width, int segment);
 int sfm_segment_alloc_width (int width, int segment);
 
+/* A mapping between an encoding name and a Windows codepage. */
+struct sys_encoding
+  {
+    int number;
+    const char *name;
+  };
+
+extern struct sys_encoding sys_codepage_number_to_name[];
+extern struct sys_encoding sys_codepage_name_to_number[];
+
+int sys_get_codepage_from_encoding (const char *);
+const char *sys_get_encoding_from_codepage (int);
+
 #endif /* data/sys-file-private.h */