X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdata%2Fsys-file-private.h;h=a39b0c1aa304c5774f729151eabf5973ef1e7c6e;hb=c4bc3574d974d3aaf4d291097c995a31515a308a;hp=a2a85c0d9ae1b4aec634deda262dfbedfdcde86f;hpb=43b1296aafe7582e7dbe6c2b6a8b478d7d9b0fcf;p=pspp

diff --git a/src/data/sys-file-private.h b/src/data/sys-file-private.h
index a2a85c0d9a..a39b0c1aa3 100644
--- 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 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
@@ -14,14 +14,76 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
+/* Infrastructure common to system file reader and writer.
+
+   Old versions of SPSS limited string variables to a width of
+   255 bytes.  For backward compatibility with these older
+   versions, the system file format represents a string longer
+   than 255 bytes, called a "very long string", as a collection
+   of strings no longer than 255 bytes each.  The strings
+   concatenated to make a very long string are called its
+   "segments"; for consistency, variables other than very long
+   strings are considered to have a single segment.
+
+   The interfaces in this file primarily provide support for
+   dealing with very long strings.  */
+
 #ifndef DATA_SYS_FILE_PRIVATE_H
 #define DATA_SYS_FILE_PRIVATE_H 1
 
-/* This nonsense is required for SPSS compatibility. */
+#include <stddef.h>
+
+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
+  {
+    int var_width;              /* Variable width (0 to 32767). */
+    int segment_width;          /* Segment width (0 to 255). */
+    int case_index;             /* Index into case. */
+
+    /* The following members are interesting only for string
+       variables (width != 0).  For numeric variables (width ==
+       0) their values are always 0.
+
+       Note: width + padding is always a multiple of 8. */
+    int offset;                 /* Offset within string variable in case. */
+    int padding;                /* Number of padding bytes following data. */
+  };
+
+int sfm_dictionary_to_sfm_vars (const struct dictionary *,
+                                struct sfm_var **, size_t *);
+
+int sfm_width_to_octs (int width);
+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;
+  };
 
-#define MIN_VERY_LONG_STRING 256
-#define EFFECTIVE_LONG_STRING_LENGTH (MIN_VERY_LONG_STRING - 4)
+extern struct sys_encoding sys_codepage_number_to_name[];
+extern struct sys_encoding sys_codepage_name_to_number[];
 
-int sfm_width_to_bytes (int width);
+int sys_get_codepage_from_encoding (const char *);
+const char *sys_get_encoding_from_codepage (int);
 
 #endif /* data/sys-file-private.h */