+#include <stdio.h>
+#include "data/case.h"
+#include "libpspp/float-format.h"
+#include "libpspp/integer-format.h"
+
+struct any_read_info;
+struct dictionary;
+struct file_handle;
+
+struct any_reader
+ {
+ const struct any_reader_class *klass;
+ };
+
+struct any_reader_class
+ {
+ /* The name of this kind of data file, e.g. "SPSS System File". */
+ const char *name;
+
+ /* Detects whether FILE contains this type of file. Returns 1 if so, 0 if
+ not, and a negative errno value if there is an error reading FILE. */
+ int (*detect) (FILE *file);
+
+ struct any_reader *(*open) (struct file_handle *);
+ bool (*close) (struct any_reader *);
+ struct casereader *(*decode) (struct any_reader *, const char *encoding,
+ struct dictionary **,
+ struct any_read_info *);
+ size_t (*get_strings) (const struct any_reader *, struct pool *pool,
+ char ***labels, bool **ids, char ***values);
+ };
+
+extern const struct any_reader_class sys_file_reader_class;
+extern const struct any_reader_class por_file_reader_class;
+extern const struct any_reader_class pcp_file_reader_class;
+
+enum any_type
+ {
+ ANY_SYS, /* SPSS System File. */
+ ANY_PCP, /* SPSS/PC+ System File. */
+ ANY_POR, /* SPSS Portable File. */
+ };
+
+enum any_compression
+ {
+ ANY_COMP_NONE, /* No compression. */
+ ANY_COMP_SIMPLE, /* Bytecode compression of integer values. */
+ ANY_COMP_ZLIB /* ZLIB "deflate" compression. */
+ };
+
+/* Data file info that doesn't fit in struct dictionary.
+
+ The strings in this structure are encoded in UTF-8. (They are normally in
+ the ASCII subset of UTF-8.) */
+struct any_read_info
+ {
+ const struct any_reader_class *klass;
+ char *creation_date;
+ char *creation_time;
+ enum integer_format integer_format;
+ enum float_format float_format;
+ enum any_compression compression;
+ casenumber n_cases; /* -1 if unknown. */
+ char *product; /* Product name. */
+ char *product_ext; /* Extra product info. */
+
+ /* Writer's version number in X.Y.Z format.
+ The version number is not always present; if not, then
+ all of these are set to 0. */
+ int version_major; /* X. */
+ int version_minor; /* Y. */
+ int version_revision; /* Z. */
+ };
+
+void any_read_info_destroy (struct any_read_info *);