1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-2000, 2006-2007, 2009-2016 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #include "data/sys-file-private.h"
28 #include "data/any-reader.h"
29 #include "data/attributes.h"
30 #include "data/case.h"
31 #include "data/casereader-provider.h"
32 #include "data/casereader.h"
33 #include "data/dictionary.h"
34 #include "data/file-handle-def.h"
35 #include "data/file-name.h"
36 #include "data/format.h"
37 #include "data/identifier.h"
38 #include "data/missing-values.h"
39 #include "data/mrset.h"
40 #include "data/short-names.h"
41 #include "data/value-labels.h"
42 #include "data/value.h"
43 #include "data/variable.h"
44 #include "libpspp/array.h"
45 #include "libpspp/assertion.h"
46 #include "libpspp/compiler.h"
47 #include "libpspp/i18n.h"
48 #include "libpspp/ll.h"
49 #include "libpspp/message.h"
50 #include "libpspp/misc.h"
51 #include "libpspp/pool.h"
52 #include "libpspp/str.h"
53 #include "libpspp/stringi-set.h"
55 #include "gl/c-strtod.h"
56 #include "gl/c-ctype.h"
57 #include "gl/inttostr.h"
58 #include "gl/localcharset.h"
59 #include "gl/minmax.h"
60 #include "gl/unlocked-io.h"
61 #include "gl/xalloc.h"
62 #include "gl/xalloc-oversized.h"
66 #define _(msgid) gettext (msgid)
67 #define N_(msgid) (msgid)
71 /* subtypes 0-2 unknown */
72 EXT_INTEGER = 3, /* Machine integer info. */
73 EXT_FLOAT = 4, /* Machine floating-point info. */
74 EXT_VAR_SETS = 5, /* Variable sets. */
75 EXT_DATE = 6, /* DATE. */
76 EXT_MRSETS = 7, /* Multiple response sets. */
77 EXT_DATA_ENTRY = 8, /* SPSS Data Entry. */
78 /* subtype 9 unknown */
79 EXT_PRODUCT_INFO = 10, /* Extra product info text. */
80 EXT_DISPLAY = 11, /* Variable display parameters. */
81 /* subtype 12 unknown */
82 EXT_LONG_NAMES = 13, /* Long variable names. */
83 EXT_LONG_STRINGS = 14, /* Long strings. */
84 /* subtype 15 unknown */
85 EXT_NCASES = 16, /* Extended number of cases. */
86 EXT_FILE_ATTRS = 17, /* Data file attributes. */
87 EXT_VAR_ATTRS = 18, /* Variable attributes. */
88 EXT_MRSETS2 = 19, /* Multiple response sets (extended). */
89 EXT_ENCODING = 20, /* Character encoding. */
90 EXT_LONG_LABELS = 21, /* Value labels for long strings. */
91 EXT_LONG_MISSING = 22, /* Missing values for long strings. */
92 EXT_DATAVIEW = 24 /* "Format properties in dataview table". */
95 /* Fields from the top-level header record. */
96 struct sfm_header_record
98 char magic[5]; /* First 4 bytes of file, then null. */
99 int weight_idx; /* 0 if unweighted, otherwise a var index. */
100 int nominal_case_size; /* Number of var positions. */
102 /* These correspond to the members of struct any_file_info or a dictionary
103 but in the system file's encoding rather than ASCII. */
104 char creation_date[10]; /* "dd mmm yy". */
105 char creation_time[9]; /* "hh:mm:ss". */
106 char eye_catcher[61]; /* Eye-catcher string, then product name. */
107 char file_label[65]; /* File label. */
110 struct sfm_var_record
117 int missing_value_code;
120 struct variable *var;
123 struct sfm_value_label
129 struct sfm_value_label_record
132 struct sfm_value_label *labels;
133 unsigned int n_labels;
139 struct sfm_document_record
148 const char *name; /* Name. */
149 const char *label; /* Human-readable label for group. */
150 enum mrset_type type; /* Group type. */
151 const char **vars; /* Constituent variables' names. */
152 size_t n_vars; /* Number of constituent variables. */
155 enum mrset_md_cat_source cat_source; /* Source of category labels. */
156 bool label_from_var_label; /* 'label' taken from variable label? */
157 const char *counted; /* Counted value, as string. */
160 struct sfm_extension_record
162 struct ll ll; /* In struct sfm_reader 'var_attrs' list. */
163 int subtype; /* Record subtype. */
164 off_t pos; /* Starting offset in file. */
165 unsigned int size; /* Size of data elements. */
166 unsigned int count; /* Number of data elements. */
167 void *data; /* Contents. */
170 /* System file reader. */
173 struct any_reader any_reader;
175 /* Resource tracking. */
176 struct pool *pool; /* All system file state. */
179 struct any_read_info info;
180 struct sfm_header_record header;
181 struct sfm_var_record *vars;
183 struct sfm_value_label_record *labels;
185 struct sfm_document_record *document;
186 struct sfm_mrset *mrsets;
188 struct sfm_extension_record *extensions[32];
189 struct ll_list var_attrs; /* Contains "struct sfm_extension_record"s. */
192 struct file_handle *fh; /* File handle. */
193 struct fh_lock *lock; /* Mutual exclusion for file handle. */
194 FILE *file; /* File stream. */
195 off_t pos; /* Position in file. */
196 bool error; /* I/O or corruption error? */
197 struct caseproto *proto; /* Format of output cases. */
200 enum integer_format integer_format; /* On-disk integer format. */
201 enum float_format float_format; /* On-disk floating point format. */
202 struct sfm_var *sfm_vars; /* Variables. */
203 size_t sfm_var_cnt; /* Number of variables. */
204 int case_cnt; /* Number of cases */
205 const char *encoding; /* String encoding. */
206 bool written_by_readstat; /* From https://github.com/WizardMac/ReadStat? */
209 enum any_compression compression;
210 double bias; /* Compression bias, usually 100.0. */
211 uint8_t opcodes[8]; /* Current block of opcodes. */
212 size_t opcode_idx; /* Next opcode to interpret, 8 if none left. */
213 bool corruption_warning; /* Warned about possible corruption? */
215 /* ZLIB decompression. */
216 long long int ztrailer_ofs; /* Offset of ZLIB trailer at end of file. */
217 #define ZIN_BUF_SIZE 4096
218 uint8_t *zin_buf; /* Inflation input buffer. */
219 #define ZOUT_BUF_SIZE 16384
220 uint8_t *zout_buf; /* Inflation output buffer. */
221 unsigned int zout_end; /* Number of bytes of data in zout_buf. */
222 unsigned int zout_pos; /* First unconsumed byte in zout_buf. */
223 z_stream zstream; /* ZLIB inflater. */
226 static const struct casereader_class sys_file_casereader_class;
228 static struct sfm_reader *
229 sfm_reader_cast (const struct any_reader *r_)
231 assert (r_->klass == &sys_file_reader_class);
232 return UP_CAST (r_, struct sfm_reader, any_reader);
235 static bool sfm_close (struct any_reader *);
237 static struct variable *lookup_var_by_index (struct sfm_reader *, off_t,
238 const struct sfm_var_record *,
241 static void sys_msg (struct sfm_reader *r, off_t, int class,
242 const char *format, va_list args)
243 PRINTF_FORMAT (4, 0);
244 static void sys_warn (struct sfm_reader *, off_t, const char *, ...)
245 PRINTF_FORMAT (3, 4);
246 static void sys_error (struct sfm_reader *, off_t, const char *, ...)
247 PRINTF_FORMAT (3, 4);
249 static bool read_bytes (struct sfm_reader *, void *, size_t)
251 static int try_read_bytes (struct sfm_reader *, void *, size_t)
253 static bool read_int (struct sfm_reader *, int *) WARN_UNUSED_RESULT;
254 static bool read_uint (struct sfm_reader *, unsigned int *) WARN_UNUSED_RESULT;
255 static bool read_int64 (struct sfm_reader *, long long int *)
257 static bool read_uint64 (struct sfm_reader *, unsigned long long int *)
259 static bool read_string (struct sfm_reader *, char *, size_t)
261 static bool skip_bytes (struct sfm_reader *, size_t) WARN_UNUSED_RESULT;
263 /* ZLIB compressed data handling. */
264 static bool read_zheader (struct sfm_reader *) WARN_UNUSED_RESULT;
265 static bool open_zstream (struct sfm_reader *) WARN_UNUSED_RESULT;
266 static bool close_zstream (struct sfm_reader *) WARN_UNUSED_RESULT;
267 static int read_bytes_zlib (struct sfm_reader *, void *, size_t)
269 static int read_compressed_bytes (struct sfm_reader *, void *, size_t)
271 static int try_read_compressed_bytes (struct sfm_reader *, void *, size_t)
273 static bool read_compressed_float (struct sfm_reader *, double *)
276 static char *fix_line_ends (const char *);
278 static int parse_int (const struct sfm_reader *, const void *data, size_t ofs);
279 static double parse_float (const struct sfm_reader *,
280 const void *data, size_t ofs);
282 static bool read_variable_record (struct sfm_reader *,
283 struct sfm_var_record *);
284 static bool read_value_label_record (struct sfm_reader *,
285 struct sfm_value_label_record *);
286 static bool read_document_record (struct sfm_reader *);
287 static bool read_extension_record (struct sfm_reader *, int subtype,
288 struct sfm_extension_record **);
289 static bool skip_extension_record (struct sfm_reader *, int subtype);
291 static struct text_record *open_text_record (
292 struct sfm_reader *, const struct sfm_extension_record *,
293 bool recode_to_utf8);
294 static void close_text_record (struct sfm_reader *,
295 struct text_record *);
296 static bool read_variable_to_value_pair (struct sfm_reader *,
298 struct text_record *,
299 struct variable **var, char **value);
300 static void text_warn (struct sfm_reader *r, struct text_record *text,
301 const char *format, ...) PRINTF_FORMAT (3, 4);
302 static char *text_get_token (struct text_record *,
303 struct substring delimiters, char *delimiter);
304 static bool text_match (struct text_record *, char c);
305 static bool text_read_variable_name (struct sfm_reader *, struct dictionary *,
306 struct text_record *,
307 struct substring delimiters,
309 static bool text_read_short_name (struct sfm_reader *, struct dictionary *,
310 struct text_record *,
311 struct substring delimiters,
313 static const char *text_parse_counted_string (struct sfm_reader *,
314 struct text_record *);
315 static size_t text_pos (const struct text_record *);
316 static const char *text_get_all (const struct text_record *);
318 /* Dictionary reader. */
326 static bool read_dictionary (struct sfm_reader *);
327 static bool read_record (struct sfm_reader *, int type,
328 size_t *allocated_vars, size_t *allocated_labels);
329 static bool read_header (struct sfm_reader *, struct any_read_info *,
330 struct sfm_header_record *);
331 static void parse_header (struct sfm_reader *,
332 const struct sfm_header_record *,
333 struct any_read_info *, struct dictionary *);
334 static bool parse_variable_records (struct sfm_reader *, struct dictionary *,
335 struct sfm_var_record *, size_t n);
336 static void parse_format_spec (struct sfm_reader *, off_t pos,
337 unsigned int format, enum which_format,
338 struct variable *, int *format_warning_cnt);
339 static void parse_document (struct dictionary *, struct sfm_document_record *);
340 static void parse_display_parameters (struct sfm_reader *,
341 const struct sfm_extension_record *,
342 struct dictionary *);
343 static bool parse_machine_integer_info (struct sfm_reader *,
344 const struct sfm_extension_record *,
345 struct any_read_info *);
346 static void parse_machine_float_info (struct sfm_reader *,
347 const struct sfm_extension_record *);
348 static void parse_extra_product_info (struct sfm_reader *,
349 const struct sfm_extension_record *,
350 struct any_read_info *);
351 static void parse_mrsets (struct sfm_reader *,
352 const struct sfm_extension_record *,
353 size_t *allocated_mrsets);
354 static void decode_mrsets (struct sfm_reader *, struct dictionary *);
355 static void parse_long_var_name_map (struct sfm_reader *,
356 const struct sfm_extension_record *,
357 struct dictionary *);
358 static bool parse_long_string_map (struct sfm_reader *,
359 const struct sfm_extension_record *,
360 struct dictionary *);
361 static bool parse_value_labels (struct sfm_reader *, struct dictionary *,
362 const struct sfm_var_record *,
364 const struct sfm_value_label_record *);
365 static void parse_data_file_attributes (struct sfm_reader *,
366 const struct sfm_extension_record *,
367 struct dictionary *);
368 static void parse_variable_attributes (struct sfm_reader *,
369 const struct sfm_extension_record *,
370 struct dictionary *);
371 static void assign_variable_roles (struct sfm_reader *, struct dictionary *);
372 static void parse_long_string_value_labels (struct sfm_reader *,
373 const struct sfm_extension_record *,
374 struct dictionary *);
375 static void parse_long_string_missing_values (
376 struct sfm_reader *, const struct sfm_extension_record *,
377 struct dictionary *);
379 /* Frees the strings inside INFO. */
381 any_read_info_destroy (struct any_read_info *info)
385 free (info->creation_date);
386 free (info->creation_time);
387 free (info->product);
388 free (info->product_ext);
392 /* Tries to open FH for reading as a system file. Returns an sfm_reader if
393 successful, otherwise NULL. */
394 static struct any_reader *
395 sfm_open (struct file_handle *fh)
397 size_t allocated_mrsets = 0;
398 struct sfm_reader *r;
400 /* Create and initialize reader. */
401 r = xzalloc (sizeof *r);
402 r->any_reader.klass = &sys_file_reader_class;
403 r->pool = pool_create ();
404 pool_register (r->pool, free, r);
406 r->opcode_idx = sizeof r->opcodes;
407 ll_init (&r->var_attrs);
409 /* TRANSLATORS: this fragment will be interpolated into
410 messages in fh_lock() that identify types of files. */
411 r->lock = fh_lock (fh, FH_REF_FILE, N_("system file"), FH_ACC_READ, false);
415 r->file = fn_open (fh, "rb");
418 msg (ME, _("Error opening `%s' for reading as a system file: %s."),
419 fh_get_file_name (r->fh), strerror (errno));
423 if (!read_dictionary (r))
426 if (r->extensions[EXT_MRSETS] != NULL)
427 parse_mrsets (r, r->extensions[EXT_MRSETS], &allocated_mrsets);
429 if (r->extensions[EXT_MRSETS2] != NULL)
430 parse_mrsets (r, r->extensions[EXT_MRSETS2], &allocated_mrsets);
432 return &r->any_reader;
436 sfm_close (&r->any_reader);
441 read_dictionary (struct sfm_reader *r)
443 size_t allocated_vars;
444 size_t allocated_labels;
446 if (!read_header (r, &r->info, &r->header))
450 allocated_labels = 0;
455 if (!read_int (r, &type))
459 if (!read_record (r, type, &allocated_vars, &allocated_labels))
463 if (!skip_bytes (r, 4))
466 if (r->compression == ANY_COMP_ZLIB && !read_zheader (r))
473 read_record (struct sfm_reader *r, int type,
474 size_t *allocated_vars, size_t *allocated_labels)
481 if (r->n_vars >= *allocated_vars)
482 r->vars = pool_2nrealloc (r->pool, r->vars, allocated_vars,
484 return read_variable_record (r, &r->vars[r->n_vars++]);
487 if (r->n_labels >= *allocated_labels)
488 r->labels = pool_2nrealloc (r->pool, r->labels, allocated_labels,
490 return read_value_label_record (r, &r->labels[r->n_labels++]);
493 /* A Type 4 record is always immediately after a type 3 record,
494 so the code for type 3 records reads the type 4 record too. */
495 sys_error (r, r->pos, _("Misplaced type 4 record."));
499 if (r->document != NULL)
501 sys_error (r, r->pos, _("Duplicate type 6 (document) record."));
504 return read_document_record (r);
507 if (!read_int (r, &subtype))
510 || subtype >= sizeof r->extensions / sizeof *r->extensions)
513 _("Unrecognized record type 7, subtype %d. For help, "
514 "please send this file to %s and mention that you were "
516 subtype, PACKAGE_BUGREPORT, PACKAGE_STRING);
517 return skip_extension_record (r, subtype);
519 else if (subtype == 18)
521 /* System files written by "Stata 14.1/-savespss- 1.77 by S.Radyakin"
522 put each variable attribute into a separate record with subtype
523 18. I'm surprised that SPSS puts up with this. */
524 struct sfm_extension_record *ext;
525 bool ok = read_extension_record (r, subtype, &ext);
527 ll_push_tail (&r->var_attrs, &ext->ll);
530 else if (r->extensions[subtype] != NULL)
533 _("Record type 7, subtype %d found here has the same "
534 "type as the record found near offset 0x%llx. For "
535 "help, please send this file to %s and mention that "
536 "you were using %s."),
537 subtype, (long long int) r->extensions[subtype]->pos,
538 PACKAGE_BUGREPORT, PACKAGE_STRING);
539 return skip_extension_record (r, subtype);
542 return read_extension_record (r, subtype, &r->extensions[subtype]);
545 sys_error (r, r->pos, _("Unrecognized record type %d."), type);
552 /* Returns the character encoding obtained from R, or a null pointer if R
553 doesn't have an indication of its character encoding. */
555 sfm_get_encoding (const struct sfm_reader *r)
557 /* The EXT_ENCODING record is the best way to determine dictionary
559 if (r->extensions[EXT_ENCODING])
560 return r->extensions[EXT_ENCODING]->data;
562 /* But EXT_INTEGER is better than nothing as a fallback. */
563 if (r->extensions[EXT_INTEGER])
565 int codepage = parse_int (r, r->extensions[EXT_INTEGER]->data, 7 * 4);
566 const char *encoding;
575 /* These ostensibly mean "7-bit ASCII" and "8-bit ASCII"[sic]
576 respectively. However, many files have character code 2 but data
577 which are clearly not ASCII. Therefore, ignore these values. */
584 encoding = sys_get_encoding_from_codepage (codepage);
585 if (encoding != NULL)
591 /* If the file magic number is EBCDIC then its character data is too. */
592 if (!strcmp (r->header.magic, EBCDIC_MAGIC))
598 struct get_strings_aux
609 add_string__ (struct get_strings_aux *aux,
610 const char *string, bool id, char *title)
612 if (aux->n >= aux->allocated)
614 aux->allocated = 2 * (aux->allocated + 1);
615 aux->titles = pool_realloc (aux->pool, aux->titles,
616 aux->allocated * sizeof *aux->titles);
617 aux->strings = pool_realloc (aux->pool, aux->strings,
618 aux->allocated * sizeof *aux->strings);
619 aux->ids = pool_realloc (aux->pool, aux->ids,
620 aux->allocated * sizeof *aux->ids);
623 aux->titles[aux->n] = title;
624 aux->strings[aux->n] = pool_strdup (aux->pool, string);
625 aux->ids[aux->n] = id;
629 static void PRINTF_FORMAT (3, 4)
630 add_string (struct get_strings_aux *aux,
631 const char *string, const char *title, ...)
635 va_start (args, title);
636 add_string__ (aux, string, false, pool_vasprintf (aux->pool, title, args));
640 static void PRINTF_FORMAT (3, 4)
641 add_id (struct get_strings_aux *aux, const char *id, const char *title, ...)
645 va_start (args, title);
646 add_string__ (aux, id, true, pool_vasprintf (aux->pool, title, args));
650 /* Retrieves significant string data from R in its raw format, to allow the
651 caller to try to detect the encoding in use.
653 Returns the number of strings retrieved N. Sets each of *TITLESP, *IDSP,
654 and *STRINGSP to an array of N elements allocated from POOL. For each I in
655 0...N-1, UTF-8 string *TITLESP[I] describes *STRINGSP[I], which is in
656 whatever encoding system file R uses. *IDS[I] is true if *STRINGSP[I] must
657 be a valid PSPP language identifier, false if *STRINGSP[I] is free-form
660 sfm_get_strings (const struct any_reader *r_, struct pool *pool,
661 char ***titlesp, bool **idsp, char ***stringsp)
663 struct sfm_reader *r = sfm_reader_cast (r_);
664 const struct sfm_mrset *mrset;
665 struct get_strings_aux aux;
677 for (i = 0; i < r->n_vars; i++)
678 if (r->vars[i].width != -1)
679 add_id (&aux, r->vars[i].name, _("Variable %zu"), ++var_idx);
682 for (i = 0; i < r->n_vars; i++)
683 if (r->vars[i].width != -1)
686 if (r->vars[i].label)
687 add_string (&aux, r->vars[i].label, _("Variable %zu Label"),
692 for (i = 0; i < r->n_labels; i++)
693 for (j = 0; j < r->labels[i].n_labels; j++)
694 add_string (&aux, r->labels[i].labels[j].label,
695 _("Value Label %zu"), k++);
697 add_string (&aux, r->header.creation_date, _("Creation Date"));
698 add_string (&aux, r->header.creation_time, _("Creation Time"));
699 add_string (&aux, r->header.eye_catcher, _("Product"));
700 add_string (&aux, r->header.file_label, _("File Label"));
702 if (r->extensions[EXT_PRODUCT_INFO])
703 add_string (&aux, r->extensions[EXT_PRODUCT_INFO]->data,
704 _("Extra Product Info"));
710 for (i = 0; i < r->document->n_lines; i++)
714 memcpy (line, r->document->documents + i * 80, 80);
717 add_string (&aux, line, _("Document Line %zu"), i + 1);
721 for (mrset = r->mrsets; mrset < &r->mrsets[r->n_mrsets]; mrset++)
723 size_t mrset_idx = mrset - r->mrsets + 1;
725 add_id (&aux, mrset->name, _("MRSET %zu"), mrset_idx);
727 add_string (&aux, mrset->label, _("MRSET %zu Label"), mrset_idx);
729 /* Skip the variables because they ought to be duplicates. */
732 add_string (&aux, mrset->counted, _("MRSET %zu Counted Value"),
736 /* data file attributes */
737 /* variable attributes */
739 /* long string value labels */
740 /* long string missing values */
742 *titlesp = aux.titles;
744 *stringsp = aux.strings;
748 /* Decodes the dictionary read from R, saving it into into *DICT. Character
749 strings in R are decoded using ENCODING, or an encoding obtained from R if
750 ENCODING is null, or the locale encoding if R specifies no encoding.
752 If INFOP is non-null, then it receives additional info about the system
753 file, which the caller must eventually free with any_read_info_destroy()
754 when it is no longer needed.
756 This function consumes R. The caller must use it again later, even to
757 destroy it with sfm_close(). */
758 static struct casereader *
759 sfm_decode (struct any_reader *r_, const char *encoding,
760 struct dictionary **dictp, struct any_read_info *infop)
762 struct sfm_reader *r = sfm_reader_cast (r_);
763 struct dictionary *dict;
766 if (encoding == NULL)
768 encoding = sfm_get_encoding (r);
769 if (encoding == NULL)
771 sys_warn (r, -1, _("This system file does not indicate its own "
772 "character encoding. Using default encoding "
773 "%s. For best results, specify an encoding "
774 "explicitly. Use SYSFILE INFO with "
775 "ENCODING=\"DETECT\" to analyze the possible "
778 encoding = locale_charset ();
782 dict = dict_create (encoding);
783 r->encoding = dict_get_encoding (dict);
785 /* These records don't use variables at all. */
786 if (r->document != NULL)
787 parse_document (dict, r->document);
789 if (r->extensions[EXT_INTEGER] != NULL
790 && !parse_machine_integer_info (r, r->extensions[EXT_INTEGER], &r->info))
793 if (r->extensions[EXT_FLOAT] != NULL)
794 parse_machine_float_info (r, r->extensions[EXT_FLOAT]);
796 if (r->extensions[EXT_PRODUCT_INFO] != NULL)
797 parse_extra_product_info (r, r->extensions[EXT_PRODUCT_INFO], &r->info);
799 if (r->extensions[EXT_FILE_ATTRS] != NULL)
800 parse_data_file_attributes (r, r->extensions[EXT_FILE_ATTRS], dict);
802 parse_header (r, &r->header, &r->info, dict);
804 /* Parse the variable records, the basis of almost everything else. */
805 if (!parse_variable_records (r, dict, r->vars, r->n_vars))
808 /* Parse value labels and the weight variable immediately after the variable
809 records. These records use indexes into var_recs[], so we must parse them
810 before those indexes become invalidated by very long string variables. */
811 for (i = 0; i < r->n_labels; i++)
812 if (!parse_value_labels (r, dict, r->vars, r->n_vars, &r->labels[i]))
814 if (r->header.weight_idx != 0)
816 struct variable *weight_var;
818 weight_var = lookup_var_by_index (r, 76, r->vars, r->n_vars,
819 r->header.weight_idx);
820 if (weight_var != NULL)
822 if (var_is_numeric (weight_var))
823 dict_set_weight (dict, weight_var);
825 sys_warn (r, -1, _("Ignoring string variable `%s' set "
826 "as weighting variable."),
827 var_get_name (weight_var));
831 if (r->extensions[EXT_DISPLAY] != NULL)
832 parse_display_parameters (r, r->extensions[EXT_DISPLAY], dict);
834 /* The following records use short names, so they need to be parsed before
835 parse_long_var_name_map() changes short names to long names. */
836 decode_mrsets (r, dict);
838 if (r->extensions[EXT_LONG_STRINGS] != NULL
839 && !parse_long_string_map (r, r->extensions[EXT_LONG_STRINGS], dict))
842 /* Now rename variables to their long names. */
843 parse_long_var_name_map (r, r->extensions[EXT_LONG_NAMES], dict);
845 /* The following records use long names, so they need to follow renaming. */
846 if (!ll_is_empty (&r->var_attrs))
848 struct sfm_extension_record *ext;
849 ll_for_each (ext, struct sfm_extension_record, ll, &r->var_attrs)
850 parse_variable_attributes (r, ext, dict);
852 /* Roles use the $@Role attribute. */
853 assign_variable_roles (r, dict);
855 if (r->extensions[EXT_LONG_LABELS] != NULL)
856 parse_long_string_value_labels (r, r->extensions[EXT_LONG_LABELS], dict);
857 if (r->extensions[EXT_LONG_MISSING] != NULL)
858 parse_long_string_missing_values (r, r->extensions[EXT_LONG_MISSING],
861 /* Warn if the actual amount of data per case differs from the
862 amount that the header claims. SPSS version 13 gets this
863 wrong when very long strings are involved, so don't warn in
865 if (r->header.nominal_case_size > 0
866 && r->header.nominal_case_size != r->n_vars
867 && r->info.version_major != 13)
868 sys_warn (r, -1, _("File header claims %d variable positions but "
869 "%zu were read from file."),
870 r->header.nominal_case_size, r->n_vars);
872 /* Create an index of dictionary variable widths for
873 sfm_read_case to use. We cannot use the `struct variable's
874 from the dictionary we created, because the caller owns the
875 dictionary and may destroy or modify its variables. */
876 sfm_dictionary_to_sfm_vars (dict, &r->sfm_vars, &r->sfm_var_cnt);
877 pool_register (r->pool, free, r->sfm_vars);
878 r->proto = caseproto_ref_pool (dict_get_proto (dict), r->pool);
884 memset (&r->info, 0, sizeof r->info);
887 return casereader_create_sequential
889 r->case_cnt == -1 ? CASENUMBER_MAX: r->case_cnt,
890 &sys_file_casereader_class, r);
899 /* Closes R, which should have been returned by sfm_open() but not already
900 closed with sfm_decode() or this function.
901 Returns true if an I/O error has occurred on READER, false
904 sfm_close (struct any_reader *r_)
906 struct sfm_reader *r = sfm_reader_cast (r_);
911 if (fn_close (r->fh, r->file) == EOF)
913 msg (ME, _("Error closing system file `%s': %s."),
914 fh_get_file_name (r->fh), strerror (errno));
920 any_read_info_destroy (&r->info);
925 pool_destroy (r->pool);
930 /* Destroys READER. */
932 sys_file_casereader_destroy (struct casereader *reader UNUSED, void *r_)
934 struct sfm_reader *r = r_;
935 sfm_close (&r->any_reader);
938 /* Detects whether FILE is an SPSS system file. Returns 1 if so, 0 if not, and
939 a negative errno value if there is an error reading FILE. */
941 sfm_detect (FILE *file)
945 if (fseek (file, 0, SEEK_SET) != 0)
947 if (fread (magic, 4, 1, file) != 1)
948 return ferror (file) ? -errno : 0;
951 return (!strcmp (ASCII_MAGIC, magic)
952 || !strcmp (ASCII_ZMAGIC, magic)
953 || !strcmp (EBCDIC_MAGIC, magic));
956 /* Reads the global header of the system file. Initializes *HEADER and *INFO,
957 except for the string fields in *INFO, which parse_header() will initialize
958 later once the file's encoding is known. */
960 read_header (struct sfm_reader *r, struct any_read_info *info,
961 struct sfm_header_record *header)
963 uint8_t raw_layout_code[4];
968 if (!read_string (r, header->magic, sizeof header->magic)
969 || !read_string (r, header->eye_catcher, sizeof header->eye_catcher))
971 r->written_by_readstat = strstr (header->eye_catcher,
972 "https://github.com/WizardMac/ReadStat");
974 if (!strcmp (ASCII_MAGIC, header->magic)
975 || !strcmp (EBCDIC_MAGIC, header->magic))
977 else if (!strcmp (ASCII_ZMAGIC, header->magic))
981 sys_error (r, 0, _("This is not an SPSS system file."));
985 /* Identify integer format. */
986 if (!read_bytes (r, raw_layout_code, sizeof raw_layout_code))
988 if ((!integer_identify (2, raw_layout_code, sizeof raw_layout_code,
990 && !integer_identify (3, raw_layout_code, sizeof raw_layout_code,
992 || (r->integer_format != INTEGER_MSB_FIRST
993 && r->integer_format != INTEGER_LSB_FIRST))
995 sys_error (r, 64, _("This is not an SPSS system file."));
999 if (!read_int (r, &header->nominal_case_size))
1002 if (header->nominal_case_size < 0
1003 || header->nominal_case_size > INT_MAX / 16)
1004 header->nominal_case_size = -1;
1006 if (!read_int (r, &compressed))
1010 if (compressed == 0)
1011 r->compression = ANY_COMP_NONE;
1012 else if (compressed == 1)
1013 r->compression = ANY_COMP_SIMPLE;
1014 else if (compressed != 0)
1016 sys_error (r, 0, "System file header has invalid compression "
1017 "value %d.", compressed);
1023 if (compressed == 2)
1024 r->compression = ANY_COMP_ZLIB;
1027 sys_error (r, 0, "ZLIB-compressed system file header has invalid "
1028 "compression value %d.", compressed);
1033 if (!read_int (r, &header->weight_idx))
1036 if (!read_int (r, &r->case_cnt))
1038 if ( r->case_cnt > INT_MAX / 2)
1041 /* Identify floating-point format and obtain compression bias. */
1042 if (!read_bytes (r, raw_bias, sizeof raw_bias))
1044 if (float_identify (100.0, raw_bias, sizeof raw_bias, &r->float_format) == 0)
1046 uint8_t zero_bias[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
1048 if (memcmp (raw_bias, zero_bias, 8))
1049 sys_warn (r, r->pos - 8,
1050 _("Compression bias is not the usual "
1051 "value of 100, or system file uses unrecognized "
1052 "floating-point format."));
1055 /* Some software is known to write all-zeros to this
1056 field. Such software also writes floating-point
1057 numbers in the format that we expect by default
1058 (it seems that all software most likely does, in
1059 reality), so don't warn in this case. */
1062 if (r->integer_format == INTEGER_MSB_FIRST)
1063 r->float_format = FLOAT_IEEE_DOUBLE_BE;
1065 r->float_format = FLOAT_IEEE_DOUBLE_LE;
1067 float_convert (r->float_format, raw_bias, FLOAT_NATIVE_DOUBLE, &r->bias);
1069 if (!read_string (r, header->creation_date, sizeof header->creation_date)
1070 || !read_string (r, header->creation_time, sizeof header->creation_time)
1071 || !read_string (r, header->file_label, sizeof header->file_label)
1072 || !skip_bytes (r, 3))
1075 info->integer_format = r->integer_format;
1076 info->float_format = r->float_format;
1077 info->compression = r->compression;
1078 info->case_cnt = r->case_cnt;
1083 /* Reads a variable (type 2) record from R into RECORD. */
1085 read_variable_record (struct sfm_reader *r, struct sfm_var_record *record)
1087 int has_variable_label;
1089 memset (record, 0, sizeof *record);
1091 record->pos = r->pos;
1092 if (!read_int (r, &record->width)
1093 || !read_int (r, &has_variable_label)
1094 || !read_int (r, &record->missing_value_code)
1095 || !read_int (r, &record->print_format)
1096 || !read_int (r, &record->write_format)
1097 || !read_string (r, record->name, sizeof record->name))
1100 if (has_variable_label == 1)
1102 enum { MAX_LABEL_LEN = 65536 };
1103 unsigned int len, read_len;
1105 if (!read_uint (r, &len))
1108 /* Read up to MAX_LABEL_LEN bytes of label. */
1109 read_len = MIN (MAX_LABEL_LEN, len);
1110 record->label = pool_malloc (r->pool, read_len + 1);
1111 if (!read_string (r, record->label, read_len + 1))
1114 /* Skip unread label bytes. */
1115 if (!skip_bytes (r, len - read_len))
1118 /* Skip label padding up to multiple of 4 bytes. */
1119 if (!skip_bytes (r, ROUND_UP (len, 4) - len))
1122 else if (has_variable_label != 0)
1124 sys_error (r, record->pos,
1125 _("Variable label indicator field is not 0 or 1."));
1129 /* Set missing values. */
1130 if (record->missing_value_code != 0)
1132 int code = record->missing_value_code;
1133 if (record->width == 0)
1135 if (code < -3 || code > 3 || code == -1)
1137 sys_error (r, record->pos,
1138 _("Numeric missing value indicator field is not "
1139 "-3, -2, 0, 1, 2, or 3."));
1145 if (code < 1 || code > 3)
1147 sys_error (r, record->pos,
1148 _("String missing value indicator field is not "
1154 if (!read_bytes (r, record->missing, 8 * abs (code)))
1161 /* Reads value labels from R into RECORD. */
1163 read_value_label_record (struct sfm_reader *r,
1164 struct sfm_value_label_record *record)
1169 /* Read type 3 record. */
1170 record->pos = r->pos;
1171 if (!read_uint (r, &record->n_labels))
1173 if (record->n_labels > UINT_MAX / sizeof *record->labels)
1175 sys_error (r, r->pos - 4, _("Invalid number of labels %u."),
1179 record->labels = pool_nmalloc (r->pool, record->n_labels,
1180 sizeof *record->labels);
1181 for (i = 0; i < record->n_labels; i++)
1183 struct sfm_value_label *label = &record->labels[i];
1184 unsigned char label_len;
1187 if (!read_bytes (r, label->value, sizeof label->value))
1190 /* Read label length. */
1191 if (!read_bytes (r, &label_len, sizeof label_len))
1193 padded_len = ROUND_UP (label_len + 1, 8);
1195 /* Read label, padding. */
1196 label->label = pool_malloc (r->pool, padded_len + 1);
1197 if (!read_bytes (r, label->label, padded_len - 1))
1199 label->label[label_len] = '\0';
1202 /* Read record type of type 4 record. */
1203 if (!read_int (r, &type))
1207 sys_error (r, r->pos - 4,
1208 _("Variable index record (type 4) does not immediately "
1209 "follow value label record (type 3) as it should."));
1213 /* Read number of variables associated with value label from type 4
1215 if (!read_uint (r, &record->n_vars))
1217 if (record->n_vars < 1 || record->n_vars > r->n_vars)
1219 sys_error (r, r->pos - 4,
1220 _("Number of variables associated with a value label (%u) "
1221 "is not between 1 and the number of variables (%zu)."),
1222 record->n_vars, r->n_vars);
1226 record->vars = pool_nmalloc (r->pool, record->n_vars, sizeof *record->vars);
1227 for (i = 0; i < record->n_vars; i++)
1228 if (!read_int (r, &record->vars[i]))
1234 /* Reads a document record from R. Returns true if successful, false on
1237 read_document_record (struct sfm_reader *r)
1240 if (!read_int (r, &n_lines))
1242 else if (n_lines == 0)
1244 else if (n_lines < 0 || n_lines >= INT_MAX / DOC_LINE_LENGTH)
1246 sys_error (r, r->pos,
1247 _("Number of document lines (%d) "
1248 "must be greater than 0 and less than %d."),
1249 n_lines, INT_MAX / DOC_LINE_LENGTH);
1253 struct sfm_document_record *record;
1254 record = pool_malloc (r->pool, sizeof *record);
1255 record->pos = r->pos;
1256 record->n_lines = n_lines;
1257 record->documents = pool_malloc (r->pool, DOC_LINE_LENGTH * n_lines);
1258 if (!read_bytes (r, record->documents, DOC_LINE_LENGTH * n_lines))
1261 r->document = record;
1266 read_extension_record_header (struct sfm_reader *r, int subtype,
1267 struct sfm_extension_record *record)
1269 record->subtype = subtype;
1270 record->pos = r->pos;
1271 if (!read_uint (r, &record->size) || !read_uint (r, &record->count))
1274 /* Check that SIZE * COUNT + 1 doesn't overflow. Adding 1
1275 allows an extra byte for a null terminator, used by some
1276 extension processing routines. */
1277 if (record->size != 0
1278 && xsum (1, xtimes (record->count, record->size)) >= UINT_MAX)
1280 sys_error (r, record->pos, "Record type 7 subtype %d too large.",
1288 /* Reads an extension record from R into RECORD. */
1290 read_extension_record (struct sfm_reader *r, int subtype,
1291 struct sfm_extension_record **recordp)
1293 struct extension_record_type
1300 static const struct extension_record_type types[] =
1302 /* Implemented record types. */
1303 { EXT_INTEGER, 4, 8 },
1304 { EXT_FLOAT, 8, 3 },
1305 { EXT_MRSETS, 1, 0 },
1306 { EXT_PRODUCT_INFO, 1, 0 },
1307 { EXT_DISPLAY, 4, 0 },
1308 { EXT_LONG_NAMES, 1, 0 },
1309 { EXT_LONG_STRINGS, 1, 0 },
1310 { EXT_NCASES, 8, 2 },
1311 { EXT_FILE_ATTRS, 1, 0 },
1312 { EXT_VAR_ATTRS, 1, 0 },
1313 { EXT_MRSETS2, 1, 0 },
1314 { EXT_ENCODING, 1, 0 },
1315 { EXT_LONG_LABELS, 1, 0 },
1316 { EXT_LONG_MISSING, 1, 0 },
1318 /* Ignored record types. */
1319 { EXT_VAR_SETS, 0, 0 },
1321 { EXT_DATA_ENTRY, 0, 0 },
1322 { EXT_DATAVIEW, 0, 0 },
1325 const struct extension_record_type *type;
1326 struct sfm_extension_record *record;
1330 record = pool_malloc (r->pool, sizeof *record);
1331 if (!read_extension_record_header (r, subtype, record))
1333 n_bytes = record->count * record->size;
1335 for (type = types; type < &types[sizeof types / sizeof *types]; type++)
1336 if (subtype == type->subtype)
1338 if (type->size > 0 && record->size != type->size)
1339 sys_warn (r, record->pos,
1340 _("Record type 7, subtype %d has bad size %u "
1341 "(expected %d)."), subtype, record->size, type->size);
1342 else if (type->count > 0 && record->count != type->count)
1343 sys_warn (r, record->pos,
1344 _("Record type 7, subtype %d has bad count %u "
1345 "(expected %d)."), subtype, record->count, type->count);
1346 else if (type->count == 0 && type->size == 0)
1348 /* Ignore this record. */
1352 char *data = pool_malloc (r->pool, n_bytes + 1);
1353 data[n_bytes] = '\0';
1355 record->data = data;
1356 if (!read_bytes (r, record->data, n_bytes))
1365 sys_warn (r, record->pos,
1366 _("Unrecognized record type 7, subtype %d. For help, please "
1367 "send this file to %s and mention that you were using %s."),
1368 subtype, PACKAGE_BUGREPORT, PACKAGE_STRING);
1371 return skip_bytes (r, n_bytes);
1375 skip_extension_record (struct sfm_reader *r, int subtype)
1377 struct sfm_extension_record record;
1379 return (read_extension_record_header (r, subtype, &record)
1380 && skip_bytes (r, record.count * record.size));
1384 parse_header (struct sfm_reader *r, const struct sfm_header_record *header,
1385 struct any_read_info *info, struct dictionary *dict)
1387 const char *dict_encoding = dict_get_encoding (dict);
1388 struct substring product;
1389 struct substring label;
1392 /* Convert file label to UTF-8 and put it into DICT. */
1393 label = recode_substring_pool ("UTF-8", dict_encoding,
1394 ss_cstr (header->file_label), r->pool);
1395 ss_trim (&label, ss_cstr (" "));
1396 label.string[label.length] = '\0';
1397 fixed_label = fix_line_ends (label.string);
1398 dict_set_label (dict, fixed_label);
1401 /* Put creation date and time in UTF-8 into INFO. */
1402 info->creation_date = recode_string ("UTF-8", dict_encoding,
1403 header->creation_date, -1);
1404 info->creation_time = recode_string ("UTF-8", dict_encoding,
1405 header->creation_time, -1);
1407 /* Put product name into INFO, dropping eye-catcher string if present. */
1408 product = recode_substring_pool ("UTF-8", dict_encoding,
1409 ss_cstr (header->eye_catcher), r->pool);
1410 ss_match_string (&product, ss_cstr ("@(#) SPSS DATA FILE"));
1411 ss_trim (&product, ss_cstr (" "));
1412 info->product = ss_xstrdup (product);
1415 /* Reads a variable (type 2) record from R and adds the
1416 corresponding variable to DICT.
1417 Also skips past additional variable records for long string
1420 parse_variable_records (struct sfm_reader *r, struct dictionary *dict,
1421 struct sfm_var_record *var_recs, size_t n_var_recs)
1423 const char *dict_encoding = dict_get_encoding (dict);
1424 struct sfm_var_record *rec;
1427 for (rec = var_recs; rec < &var_recs[n_var_recs]; )
1429 struct variable *var;
1434 name = recode_string_pool ("UTF-8", dict_encoding,
1435 rec->name, -1, r->pool);
1436 name[strcspn (name, " ")] = '\0';
1438 if (!dict_id_is_valid (dict, name, false)
1439 || name[0] == '$' || name[0] == '#')
1441 sys_error (r, rec->pos, _("Invalid variable name `%s'."), name);
1445 if (rec->width < 0 || rec->width > 255)
1447 sys_error (r, rec->pos,
1448 _("Bad width %d for variable %s."), rec->width, name);
1452 var = rec->var = dict_create_var (dict, name, rec->width);
1455 char *new_name = dict_make_unique_var_name (dict, NULL, NULL);
1456 sys_warn (r, rec->pos, _("Renaming variable with duplicate name "
1459 var = rec->var = dict_create_var_assert (dict, new_name, rec->width);
1460 var_set_short_name (var, 0, new_name);
1464 /* Set the short name the same as the long name (even if we renamed
1466 var_set_short_name (var, 0, var_get_name (var));
1468 /* Get variable label, if any. */
1473 utf8_label = recode_string_pool ("UTF-8", dict_encoding,
1474 rec->label, -1, r->pool);
1475 var_set_label (var, utf8_label);
1478 /* Set missing values. */
1479 if (rec->missing_value_code != 0)
1481 int width = var_get_width (var);
1482 struct missing_values mv;
1484 mv_init_pool (r->pool, &mv, width);
1485 if (var_is_numeric (var))
1487 bool has_range = rec->missing_value_code < 0;
1488 int n_discrete = (has_range
1489 ? rec->missing_value_code == -3
1490 : rec->missing_value_code);
1495 double low = parse_float (r, rec->missing, 0);
1496 double high = parse_float (r, rec->missing, 8);
1498 /* Deal with SPSS 21 change in representation. */
1502 mv_add_range (&mv, low, high);
1506 for (i = 0; i < n_discrete; i++)
1508 mv_add_num (&mv, parse_float (r, rec->missing, ofs));
1513 for (i = 0; i < rec->missing_value_code; i++)
1514 mv_add_str (&mv, rec->missing + 8 * i, MIN (width, 8));
1515 var_set_missing_values (var, &mv);
1519 parse_format_spec (r, rec->pos + 12, rec->print_format,
1520 PRINT_FORMAT, var, &n_warnings);
1521 parse_format_spec (r, rec->pos + 16, rec->write_format,
1522 WRITE_FORMAT, var, &n_warnings);
1524 /* Account for values.
1525 Skip long string continuation records, if any. */
1526 n_values = rec->width == 0 ? 1 : DIV_RND_UP (rec->width, 8);
1527 for (i = 1; i < n_values; i++)
1528 if (i + (rec - var_recs) >= n_var_recs || rec[i].width != -1)
1530 sys_error (r, rec->pos, _("Missing string continuation record."));
1539 /* Translates the format spec from sysfile format to internal
1542 parse_format_spec (struct sfm_reader *r, off_t pos, unsigned int format,
1543 enum which_format which, struct variable *v,
1546 const int max_warnings = 8;
1549 if (fmt_from_u32 (format, var_get_width (v), false, &f))
1551 if (which == PRINT_FORMAT)
1552 var_set_print_format (v, &f);
1554 var_set_write_format (v, &f);
1556 else if (format == 0)
1558 /* Actually observed in the wild. No point in warning about it. */
1560 else if (++*n_warnings <= max_warnings)
1562 if (which == PRINT_FORMAT)
1563 sys_warn (r, pos, _("Variable %s with width %d has invalid print "
1565 var_get_name (v), var_get_width (v), format);
1567 sys_warn (r, pos, _("Variable %s with width %d has invalid write "
1569 var_get_name (v), var_get_width (v), format);
1571 if (*n_warnings == max_warnings)
1572 sys_warn (r, -1, _("Suppressing further invalid format warnings."));
1577 parse_document (struct dictionary *dict, struct sfm_document_record *record)
1581 for (p = record->documents;
1582 p < record->documents + DOC_LINE_LENGTH * record->n_lines;
1583 p += DOC_LINE_LENGTH)
1585 struct substring line;
1587 line = recode_substring_pool ("UTF-8", dict_get_encoding (dict),
1588 ss_buffer (p, DOC_LINE_LENGTH), NULL);
1589 ss_rtrim (&line, ss_cstr (" "));
1590 line.string[line.length] = '\0';
1592 dict_add_document_line (dict, line.string, false);
1598 /* Parses record type 7, subtype 3. */
1600 parse_machine_integer_info (struct sfm_reader *r,
1601 const struct sfm_extension_record *record,
1602 struct any_read_info *info)
1604 int float_representation, expected_float_format;
1605 int integer_representation, expected_integer_format;
1607 /* Save version info. */
1608 info->version_major = parse_int (r, record->data, 0);
1609 info->version_minor = parse_int (r, record->data, 4);
1610 info->version_revision = parse_int (r, record->data, 8);
1612 /* Check floating point format. */
1613 float_representation = parse_int (r, record->data, 16);
1614 if (r->float_format == FLOAT_IEEE_DOUBLE_BE
1615 || r->float_format == FLOAT_IEEE_DOUBLE_LE)
1616 expected_float_format = 1;
1617 else if (r->float_format == FLOAT_Z_LONG)
1618 expected_float_format = 2;
1619 else if (r->float_format == FLOAT_VAX_G || r->float_format == FLOAT_VAX_D)
1620 expected_float_format = 3;
1623 if (float_representation != expected_float_format)
1625 sys_error (r, record->pos,
1626 _("Floating-point representation indicated by "
1627 "system file (%d) differs from expected (%d)."),
1628 float_representation, expected_float_format);
1632 /* Check integer format. */
1633 integer_representation = parse_int (r, record->data, 24);
1634 if (r->integer_format == INTEGER_MSB_FIRST)
1635 expected_integer_format = 1;
1636 else if (r->integer_format == INTEGER_LSB_FIRST)
1637 expected_integer_format = 2;
1640 if (integer_representation != expected_integer_format)
1641 sys_warn (r, record->pos,
1642 _("Integer format indicated by system file (%d) "
1643 "differs from expected (%d)."),
1644 integer_representation, expected_integer_format);
1649 /* Parses record type 7, subtype 4. */
1651 parse_machine_float_info (struct sfm_reader *r,
1652 const struct sfm_extension_record *record)
1654 double sysmis = parse_float (r, record->data, 0);
1655 double highest = parse_float (r, record->data, 8);
1656 double lowest = parse_float (r, record->data, 16);
1658 if (sysmis != SYSMIS)
1659 sys_warn (r, record->pos,
1660 _("File specifies unexpected value %g (%a) as %s, "
1661 "instead of %g (%a)."),
1662 sysmis, sysmis, "SYSMIS", SYSMIS, SYSMIS);
1664 if (highest != HIGHEST)
1665 sys_warn (r, record->pos,
1666 _("File specifies unexpected value %g (%a) as %s, "
1667 "instead of %g (%a)."),
1668 highest, highest, "HIGHEST", HIGHEST, HIGHEST);
1670 /* SPSS before version 21 used a unique value just bigger than SYSMIS as
1671 LOWEST. SPSS 21 uses SYSMIS for LOWEST, which is OK because LOWEST only
1672 appears in a context (missing values) where SYSMIS cannot. */
1673 if (lowest != LOWEST && lowest != SYSMIS)
1674 sys_warn (r, record->pos,
1675 _("File specifies unexpected value %g (%a) as %s, "
1676 "instead of %g (%a) or %g (%a)."),
1677 lowest, lowest, "LOWEST", LOWEST, LOWEST, SYSMIS, SYSMIS);
1680 /* Parses record type 7, subtype 10. */
1682 parse_extra_product_info (struct sfm_reader *r,
1683 const struct sfm_extension_record *record,
1684 struct any_read_info *info)
1686 struct text_record *text;
1688 text = open_text_record (r, record, true);
1689 info->product_ext = fix_line_ends (text_get_all (text));
1690 close_text_record (r, text);
1693 /* Parses record type 7, subtype 7 or 19. */
1695 parse_mrsets (struct sfm_reader *r, const struct sfm_extension_record *record,
1696 size_t *allocated_mrsets)
1698 struct text_record *text;
1700 text = open_text_record (r, record, false);
1703 struct sfm_mrset *mrset;
1704 size_t allocated_vars;
1707 /* Skip extra line feeds if present. */
1708 while (text_match (text, '\n'))
1711 if (r->n_mrsets >= *allocated_mrsets)
1712 r->mrsets = pool_2nrealloc (r->pool, r->mrsets, allocated_mrsets,
1714 mrset = &r->mrsets[r->n_mrsets];
1715 memset(mrset, 0, sizeof *mrset);
1717 mrset->name = text_get_token (text, ss_cstr ("="), NULL);
1718 if (mrset->name == NULL)
1721 if (text_match (text, 'C'))
1723 mrset->type = MRSET_MC;
1724 if (!text_match (text, ' '))
1726 sys_warn (r, record->pos,
1727 _("Missing space following `%c' at offset %zu "
1728 "in MRSETS record."), 'C', text_pos (text));
1732 else if (text_match (text, 'D'))
1734 mrset->type = MRSET_MD;
1735 mrset->cat_source = MRSET_VARLABELS;
1737 else if (text_match (text, 'E'))
1741 mrset->type = MRSET_MD;
1742 mrset->cat_source = MRSET_COUNTEDVALUES;
1743 if (!text_match (text, ' '))
1745 sys_warn (r, record->pos,
1746 _("Missing space following `%c' at offset %zu "
1747 "in MRSETS record."), 'E', text_pos (text));
1751 number = text_get_token (text, ss_cstr (" "), NULL);
1753 sys_warn (r, record->pos,
1754 _("Missing label source value "
1755 "following `E' at offset %zu in MRSETS record."),
1757 else if (!strcmp (number, "11"))
1758 mrset->label_from_var_label = true;
1759 else if (strcmp (number, "1"))
1760 sys_warn (r, record->pos,
1761 _("Unexpected label source value following `E' "
1762 "at offset %zu in MRSETS record."),
1767 sys_warn (r, record->pos,
1768 _("Missing `C', `D', or `E' at offset %zu "
1769 "in MRSETS record."),
1774 if (mrset->type == MRSET_MD)
1776 mrset->counted = text_parse_counted_string (r, text);
1777 if (mrset->counted == NULL)
1781 mrset->label = text_parse_counted_string (r, text);
1782 if (mrset->label == NULL)
1790 var = text_get_token (text, ss_cstr (" \n"), &delimiter);
1793 if (delimiter != '\n')
1794 sys_warn (r, record->pos,
1795 _("Missing new-line parsing variable names "
1796 "at offset %zu in MRSETS record."),
1801 if (mrset->n_vars >= allocated_vars)
1802 mrset->vars = pool_2nrealloc (r->pool, mrset->vars,
1804 sizeof *mrset->vars);
1805 mrset->vars[mrset->n_vars++] = var;
1807 while (delimiter != '\n');
1811 close_text_record (r, text);
1815 decode_mrsets (struct sfm_reader *r, struct dictionary *dict)
1817 const struct sfm_mrset *s;
1819 for (s = r->mrsets; s < &r->mrsets[r->n_mrsets]; s++)
1821 struct stringi_set var_names;
1822 struct mrset *mrset;
1827 name = recode_string ("UTF-8", r->encoding, s->name, -1);
1828 if (!mrset_is_valid_name (name, dict_get_encoding (dict), false))
1830 sys_warn (r, -1, _("Invalid multiple response set name `%s'."),
1836 mrset = xzalloc (sizeof *mrset);
1838 mrset->type = s->type;
1839 mrset->cat_source = s->cat_source;
1840 mrset->label_from_var_label = s->label_from_var_label;
1841 if (s->label[0] != '\0')
1842 mrset->label = recode_string ("UTF-8", r->encoding, s->label, -1);
1844 stringi_set_init (&var_names);
1845 mrset->vars = xmalloc (s->n_vars * sizeof *mrset->vars);
1847 for (i = 0; i < s->n_vars; i++)
1849 struct variable *var;
1852 var_name = recode_string ("UTF-8", r->encoding, s->vars[i], -1);
1854 var = dict_lookup_var (dict, var_name);
1860 if (!stringi_set_insert (&var_names, var_name))
1863 _("MRSET %s contains duplicate variable name %s."),
1864 mrset->name, var_name);
1870 if (mrset->label == NULL && mrset->label_from_var_label
1871 && var_has_label (var))
1872 mrset->label = xstrdup (var_get_label (var));
1875 && var_get_type (var) != var_get_type (mrset->vars[0]))
1878 _("MRSET %s contains both string and "
1879 "numeric variables."), mrset->name);
1882 width = MIN (width, var_get_width (var));
1884 mrset->vars[mrset->n_vars++] = var;
1887 if (mrset->n_vars < 2)
1889 if (mrset->n_vars == 0)
1890 sys_warn (r, -1, _("MRSET %s has no variables."), mrset->name);
1892 sys_warn (r, -1, _("MRSET %s has only one variable."),
1894 mrset_destroy (mrset);
1895 stringi_set_destroy (&var_names);
1899 if (mrset->type == MRSET_MD)
1901 mrset->width = width;
1902 value_init (&mrset->counted, width);
1904 mrset->counted.f = c_strtod (s->counted, NULL);
1906 value_copy_str_rpad (&mrset->counted, width,
1907 (const uint8_t *) s->counted, ' ');
1910 dict_add_mrset (dict, mrset);
1911 stringi_set_destroy (&var_names);
1915 /* Read record type 7, subtype 11, which specifies how variables
1916 should be displayed in GUI environments. */
1918 parse_display_parameters (struct sfm_reader *r,
1919 const struct sfm_extension_record *record,
1920 struct dictionary *dict)
1922 bool includes_width;
1923 bool warned = false;
1928 n_vars = dict_get_var_cnt (dict);
1929 if (record->count == 3 * n_vars)
1930 includes_width = true;
1931 else if (record->count == 2 * n_vars)
1932 includes_width = false;
1935 sys_warn (r, record->pos,
1936 _("Extension 11 has bad count %u (for %zu variables)."),
1937 record->count, n_vars);
1942 for (i = 0; i < n_vars; ++i)
1944 struct variable *v = dict_get_var (dict, i);
1945 int measure, width, align;
1947 measure = parse_int (r, record->data, ofs);
1952 width = parse_int (r, record->data, ofs);
1958 align = parse_int (r, record->data, ofs);
1961 /* SPSS sometimes seems to set variables' measure to zero. */
1965 if (measure < 1 || measure > 3 || align < 0 || align > 2)
1968 sys_warn (r, record->pos,
1969 _("Invalid variable display parameters for variable "
1970 "%zu (%s). Default parameters substituted."),
1971 i, var_get_name (v));
1976 var_set_measure (v, (measure == 1 ? MEASURE_NOMINAL
1977 : measure == 2 ? MEASURE_ORDINAL
1979 var_set_alignment (v, (align == 0 ? ALIGN_LEFT
1980 : align == 1 ? ALIGN_RIGHT
1983 /* Older versions (SPSS 9.0) sometimes set the display
1984 width to zero. This causes confusion in the GUI, so
1985 only set the width if it is nonzero. */
1987 var_set_display_width (v, width);
1992 rename_var_and_save_short_names (struct sfm_reader *r, off_t pos,
1993 struct dictionary *dict,
1994 struct variable *var, const char *new_name)
1996 size_t n_short_names;
2000 /* Renaming a variable may clear its short names, but we
2001 want to retain them, so we save them and re-set them
2003 n_short_names = var_get_short_name_cnt (var);
2004 short_names = xnmalloc (n_short_names, sizeof *short_names);
2005 for (i = 0; i < n_short_names; i++)
2007 const char *s = var_get_short_name (var, i);
2008 short_names[i] = s != NULL ? xstrdup (s) : NULL;
2011 /* Set long name. */
2012 if (!dict_try_rename_var (dict, var, new_name))
2013 sys_warn (r, pos, _("Duplicate long variable name `%s'."), new_name);
2015 /* Restore short names. */
2016 for (i = 0; i < n_short_names; i++)
2018 var_set_short_name (var, i, short_names[i]);
2019 free (short_names[i]);
2024 /* Parses record type 7, subtype 13, which gives the long name that corresponds
2025 to each short name. Modifies variable names in DICT accordingly. */
2027 parse_long_var_name_map (struct sfm_reader *r,
2028 const struct sfm_extension_record *record,
2029 struct dictionary *dict)
2031 struct text_record *text;
2032 struct variable *var;
2037 /* There are no long variable names. Use the short variable names,
2038 converted to lowercase, as the long variable names. */
2041 for (i = 0; i < dict_get_var_cnt (dict); i++)
2043 struct variable *var = dict_get_var (dict, i);
2046 new_name = utf8_to_lower (var_get_name (var));
2047 rename_var_and_save_short_names (r, -1, dict, var, new_name);
2054 /* Rename each of the variables, one by one. (In a correctly constructed
2055 system file, this cannot create any intermediate duplicate variable names,
2056 because all of the new variable names are longer than any of the old
2057 variable names and thus there cannot be any overlaps.) */
2058 text = open_text_record (r, record, true);
2059 while (read_variable_to_value_pair (r, dict, text, &var, &long_name))
2061 /* Validate long name. */
2062 if (!dict_id_is_valid (dict, long_name, false)
2063 || long_name[0] == '$' || long_name[0] == '#')
2065 sys_warn (r, record->pos,
2066 _("Long variable mapping from %s to invalid "
2067 "variable name `%s'."),
2068 var_get_name (var), long_name);
2072 rename_var_and_save_short_names (r, record->pos, dict, var, long_name);
2074 close_text_record (r, text);
2077 /* Reads record type 7, subtype 14, which gives the real length
2078 of each very long string. Rearranges DICT accordingly. */
2080 parse_long_string_map (struct sfm_reader *r,
2081 const struct sfm_extension_record *record,
2082 struct dictionary *dict)
2084 struct text_record *text;
2085 struct variable *var;
2088 text = open_text_record (r, record, true);
2089 while (read_variable_to_value_pair (r, dict, text, &var, &length_s))
2091 size_t idx = var_get_dict_index (var);
2097 length = strtol (length_s, NULL, 10);
2098 if (length < 1 || length > MAX_STRING)
2100 sys_warn (r, record->pos,
2101 _("%s listed as string of invalid length %s "
2102 "in very long string record."),
2103 var_get_name (var), length_s);
2107 /* Check segments. */
2108 segment_cnt = sfm_width_to_segments (length);
2109 if (segment_cnt == 1)
2111 sys_warn (r, record->pos,
2112 _("%s listed in very long string record with width %s, "
2113 "which requires only one segment."),
2114 var_get_name (var), length_s);
2117 if (idx + segment_cnt > dict_get_var_cnt (dict))
2119 sys_error (r, record->pos,
2120 _("Very long string %s overflows dictionary."),
2121 var_get_name (var));
2125 /* Get the short names from the segments and check their
2127 for (i = 0; i < segment_cnt; i++)
2129 struct variable *seg = dict_get_var (dict, idx + i);
2130 int alloc_width = sfm_segment_alloc_width (length, i);
2131 int width = var_get_width (seg);
2134 var_set_short_name (var, i, var_get_short_name (seg, 0));
2135 if (ROUND_UP (width, 8) != ROUND_UP (alloc_width, 8))
2137 sys_error (r, record->pos,
2138 _("Very long string with width %ld has segment %d "
2139 "of width %d (expected %d)."),
2140 length, i, width, alloc_width);
2144 dict_delete_consecutive_vars (dict, idx + 1, segment_cnt - 1);
2145 var_set_width (var, length);
2147 close_text_record (r, text);
2148 dict_compact_values (dict);
2154 parse_value_labels (struct sfm_reader *r, struct dictionary *dict,
2155 const struct sfm_var_record *var_recs, size_t n_var_recs,
2156 const struct sfm_value_label_record *record)
2158 struct variable **vars;
2162 utf8_labels = pool_nmalloc (r->pool, record->n_labels, sizeof *utf8_labels);
2163 for (i = 0; i < record->n_labels; i++)
2164 utf8_labels[i] = recode_string_pool ("UTF-8", dict_get_encoding (dict),
2165 record->labels[i].label, -1,
2168 vars = pool_nmalloc (r->pool, record->n_vars, sizeof *vars);
2169 for (i = 0; i < record->n_vars; i++)
2171 vars[i] = lookup_var_by_index (r, record->pos,
2172 var_recs, n_var_recs, record->vars[i]);
2173 if (vars[i] == NULL)
2177 for (i = 1; i < record->n_vars; i++)
2178 if (var_get_type (vars[i]) != var_get_type (vars[0]))
2180 sys_error (r, record->pos,
2181 _("Variables associated with value label are not all of "
2182 "identical type. Variable %s is %s, but variable "
2184 var_get_name (vars[0]),
2185 var_is_numeric (vars[0]) ? _("numeric") : _("string"),
2186 var_get_name (vars[i]),
2187 var_is_numeric (vars[i]) ? _("numeric") : _("string"));
2191 for (i = 0; i < record->n_vars; i++)
2193 struct variable *var = vars[i];
2197 width = var_get_width (var);
2200 sys_error (r, record->pos,
2201 _("Value labels may not be added to long string "
2202 "variables (e.g. %s) using records types 3 and 4."),
2203 var_get_name (var));
2207 for (j = 0; j < record->n_labels; j++)
2209 struct sfm_value_label *label = &record->labels[j];
2212 value_init (&value, width);
2214 value.f = parse_float (r, label->value, 0);
2216 memcpy (value.s, label->value, width);
2218 if (!var_add_value_label (var, &value, utf8_labels[j]))
2220 if (r->written_by_readstat)
2222 /* Ignore the problem. ReadStat is buggy and emits value
2223 labels whose values are longer than string variables'
2224 widths, that are identical in the actual width of the
2225 variable, e.g. both values "ABC123" and "ABC456" for a
2226 string variable with width 3. */
2228 else if (var_is_numeric (var))
2229 sys_warn (r, record->pos,
2230 _("Duplicate value label for %g on %s."),
2231 value.f, var_get_name (var));
2233 sys_warn (r, record->pos,
2234 _("Duplicate value label for `%.*s' on %s."),
2235 width, value.s, var_get_name (var));
2238 value_destroy (&value, width);
2242 pool_free (r->pool, vars);
2243 for (i = 0; i < record->n_labels; i++)
2244 pool_free (r->pool, utf8_labels[i]);
2245 pool_free (r->pool, utf8_labels);
2250 static struct variable *
2251 lookup_var_by_index (struct sfm_reader *r, off_t offset,
2252 const struct sfm_var_record *var_recs, size_t n_var_recs,
2255 const struct sfm_var_record *rec;
2257 if (idx < 1 || idx > n_var_recs)
2259 sys_error (r, offset,
2260 _("Variable index %d not in valid range 1...%zu."),
2265 rec = &var_recs[idx - 1];
2266 if (rec->var == NULL)
2268 sys_error (r, offset,
2269 _("Variable index %d refers to long string continuation."),
2277 /* Parses a set of custom attributes from TEXT into ATTRS.
2278 ATTRS may be a null pointer, in which case the attributes are
2279 read but discarded. */
2281 parse_attributes (struct sfm_reader *r, struct text_record *text,
2282 struct attrset *attrs)
2286 struct attribute *attr;
2290 /* Parse the key. */
2291 key = text_get_token (text, ss_cstr ("("), NULL);
2295 attr = attribute_create (key);
2296 for (index = 1; ; index++)
2298 /* Parse the value. */
2302 value = text_get_token (text, ss_cstr ("\n"), NULL);
2305 text_warn (r, text, _("Error parsing attribute value %s[%d]."),
2310 length = strlen (value);
2311 if (length >= 2 && value[0] == '\'' && value[length - 1] == '\'')
2313 value[length - 1] = '\0';
2314 attribute_add_value (attr, value + 1);
2319 _("Attribute value %s[%d] is not quoted: %s."),
2321 attribute_add_value (attr, value);
2324 /* Was this the last value for this attribute? */
2325 if (text_match (text, ')'))
2328 if (attrs != NULL && attribute_get_n_values (attr) > 0)
2330 if (!attrset_try_add (attrs, attr))
2332 text_warn (r, text, _("Duplicate attribute %s."),
2333 attribute_get_name (attr));
2334 attribute_destroy (attr);
2338 attribute_destroy (attr);
2340 while (!text_match (text, '/'));
2343 /* Reads record type 7, subtype 17, which lists custom
2344 attributes on the data file. */
2346 parse_data_file_attributes (struct sfm_reader *r,
2347 const struct sfm_extension_record *record,
2348 struct dictionary *dict)
2350 struct text_record *text = open_text_record (r, record, true);
2351 parse_attributes (r, text, dict_get_attributes (dict));
2352 close_text_record (r, text);
2355 /* Parses record type 7, subtype 18, which lists custom
2356 attributes on individual variables. */
2358 parse_variable_attributes (struct sfm_reader *r,
2359 const struct sfm_extension_record *record,
2360 struct dictionary *dict)
2362 struct text_record *text;
2363 struct variable *var;
2365 text = open_text_record (r, record, true);
2366 while (text_read_variable_name (r, dict, text, ss_cstr (":"), &var))
2367 parse_attributes (r, text, var != NULL ? var_get_attributes (var) : NULL);
2368 close_text_record (r, text);
2372 assign_variable_roles (struct sfm_reader *r, struct dictionary *dict)
2374 size_t n_warnings = 0;
2377 for (i = 0; i < dict_get_var_cnt (dict); i++)
2379 struct variable *var = dict_get_var (dict, i);
2380 struct attrset *attrs = var_get_attributes (var);
2381 const struct attribute *attr = attrset_lookup (attrs, "$@Role");
2382 if (attr != NULL && attribute_get_n_values (attr) > 0)
2384 int value = atoi (attribute_get_value (attr, 0));
2406 role = ROLE_PARTITION;
2415 if (n_warnings++ == 0)
2416 sys_warn (r, -1, _("Invalid role for variable %s."),
2417 var_get_name (var));
2420 var_set_role (var, role);
2425 sys_warn (r, -1, _("%zu other variables had invalid roles."),
2430 check_overflow (struct sfm_reader *r,
2431 const struct sfm_extension_record *record,
2432 size_t ofs, size_t length)
2434 size_t end = record->size * record->count;
2435 if (length >= end || ofs + length > end)
2437 sys_warn (r, record->pos + end,
2438 _("Extension record subtype %d ends unexpectedly."),
2446 parse_long_string_value_labels (struct sfm_reader *r,
2447 const struct sfm_extension_record *record,
2448 struct dictionary *dict)
2450 const char *dict_encoding = dict_get_encoding (dict);
2451 size_t end = record->size * record->count;
2458 struct variable *var;
2463 /* Parse variable name length. */
2464 if (!check_overflow (r, record, ofs, 4))
2466 var_name_len = parse_int (r, record->data, ofs);
2469 /* Parse variable name, width, and number of labels. */
2470 if (!check_overflow (r, record, ofs, var_name_len)
2471 || !check_overflow (r, record, ofs, var_name_len + 8))
2473 var_name = recode_string_pool ("UTF-8", dict_encoding,
2474 (const char *) record->data + ofs,
2475 var_name_len, r->pool);
2476 width = parse_int (r, record->data, ofs + var_name_len);
2477 n_labels = parse_int (r, record->data, ofs + var_name_len + 4);
2478 ofs += var_name_len + 8;
2480 /* Look up 'var' and validate. */
2481 var = dict_lookup_var (dict, var_name);
2483 sys_warn (r, record->pos + ofs,
2484 _("Ignoring long string value label record for "
2485 "unknown variable %s."), var_name);
2486 else if (var_is_numeric (var))
2488 sys_warn (r, record->pos + ofs,
2489 _("Ignoring long string value label record for "
2490 "numeric variable %s."), var_name);
2493 else if (width != var_get_width (var))
2495 sys_warn (r, record->pos + ofs,
2496 _("Ignoring long string value label record for variable "
2497 "%s because the record's width (%d) does not match the "
2498 "variable's width (%d)."),
2499 var_name, width, var_get_width (var));
2504 value_init_pool (r->pool, &value, width);
2505 for (i = 0; i < n_labels; i++)
2507 size_t value_length, label_length;
2508 bool skip = var == NULL;
2510 /* Parse value length. */
2511 if (!check_overflow (r, record, ofs, 4))
2513 value_length = parse_int (r, record->data, ofs);
2517 if (!check_overflow (r, record, ofs, value_length))
2521 if (value_length == width)
2522 memcpy (value.s, (const uint8_t *) record->data + ofs, width);
2525 sys_warn (r, record->pos + ofs,
2526 _("Ignoring long string value label %zu for "
2527 "variable %s, with width %d, that has bad value "
2529 i, var_get_name (var), width, value_length);
2533 ofs += value_length;
2535 /* Parse label length. */
2536 if (!check_overflow (r, record, ofs, 4))
2538 label_length = parse_int (r, record->data, ofs);
2542 if (!check_overflow (r, record, ofs, label_length))
2548 label = recode_string_pool ("UTF-8", dict_encoding,
2549 (const char *) record->data + ofs,
2550 label_length, r->pool);
2551 if (!var_add_value_label (var, &value, label))
2552 sys_warn (r, record->pos + ofs,
2553 _("Duplicate value label for `%.*s' on %s."),
2554 width, value.s, var_get_name (var));
2555 pool_free (r->pool, label);
2557 ofs += label_length;
2563 parse_long_string_missing_values (struct sfm_reader *r,
2564 const struct sfm_extension_record *record,
2565 struct dictionary *dict)
2567 const char *dict_encoding = dict_get_encoding (dict);
2568 size_t end = record->size * record->count;
2573 struct missing_values mv;
2575 struct variable *var;
2576 int n_missing_values;
2580 /* Parse variable name length. */
2581 if (!check_overflow (r, record, ofs, 4))
2583 var_name_len = parse_int (r, record->data, ofs);
2586 /* Parse variable name. */
2587 if (!check_overflow (r, record, ofs, var_name_len)
2588 || !check_overflow (r, record, ofs, var_name_len + 1))
2590 var_name = recode_string_pool ("UTF-8", dict_encoding,
2591 (const char *) record->data + ofs,
2592 var_name_len, r->pool);
2593 ofs += var_name_len;
2595 /* Parse number of missing values. */
2596 n_missing_values = ((const uint8_t *) record->data)[ofs];
2597 if (n_missing_values < 1 || n_missing_values > 3)
2598 sys_warn (r, record->pos + ofs,
2599 _("Long string missing values record says variable %s "
2600 "has %d missing values, but only 1 to 3 missing values "
2602 var_name, n_missing_values);
2605 /* Look up 'var' and validate. */
2606 var = dict_lookup_var (dict, var_name);
2608 sys_warn (r, record->pos + ofs,
2609 _("Ignoring long string missing value record for "
2610 "unknown variable %s."), var_name);
2611 else if (var_is_numeric (var))
2613 sys_warn (r, record->pos + ofs,
2614 _("Ignoring long string missing value record for "
2615 "numeric variable %s."), var_name);
2620 mv_init_pool (r->pool, &mv, var ? var_get_width (var) : 8);
2621 for (i = 0; i < n_missing_values; i++)
2623 size_t value_length;
2625 /* Parse value length. */
2626 if (!check_overflow (r, record, ofs, 4))
2628 value_length = parse_int (r, record->data, ofs);
2632 if (!check_overflow (r, record, ofs, value_length))
2636 && !mv_add_str (&mv, (const uint8_t *) record->data + ofs,
2638 sys_warn (r, record->pos + ofs,
2639 _("Ignoring long string missing value %zu for variable "
2640 "%s, with width %d, that has bad value width %zu."),
2641 i, var_get_name (var), var_get_width (var),
2643 ofs += value_length;
2646 var_set_missing_values (var, &mv);
2652 static void partial_record (struct sfm_reader *);
2654 static void read_error (struct casereader *, const struct sfm_reader *);
2656 static bool read_case_number (struct sfm_reader *, double *);
2657 static int read_case_string (struct sfm_reader *, uint8_t *, size_t);
2658 static int read_opcode (struct sfm_reader *);
2659 static bool read_compressed_number (struct sfm_reader *, double *);
2660 static int read_compressed_string (struct sfm_reader *, uint8_t *);
2661 static int read_whole_strings (struct sfm_reader *, uint8_t *, size_t);
2662 static bool skip_whole_strings (struct sfm_reader *, size_t);
2664 /* Reads and returns one case from READER's file. Returns a null
2665 pointer if not successful. */
2666 static struct ccase *
2667 sys_file_casereader_read (struct casereader *reader, void *r_)
2669 struct sfm_reader *r = r_;
2674 if (r->error || !r->sfm_var_cnt)
2677 c = case_create (r->proto);
2679 for (i = 0; i < r->sfm_var_cnt; i++)
2681 struct sfm_var *sv = &r->sfm_vars[i];
2682 union value *v = case_data_rw_idx (c, sv->case_index);
2684 if (sv->var_width == 0)
2685 retval = read_case_number (r, &v->f);
2688 retval = read_case_string (r, v->s + sv->offset, sv->segment_width);
2691 retval = skip_whole_strings (r, ROUND_DOWN (sv->padding, 8));
2693 sys_error (r, r->pos, _("File ends in partial string value."));
2705 if (r->case_cnt != -1)
2706 read_error (reader, r);
2711 /* Issues an error that R ends in a partial record. */
2713 partial_record (struct sfm_reader *r)
2715 sys_error (r, r->pos, _("File ends in partial case."));
2718 /* Issues an error that an unspecified error occurred SFM, and
2721 read_error (struct casereader *r, const struct sfm_reader *sfm)
2723 msg (ME, _("Error reading case from file %s."), fh_get_name (sfm->fh));
2724 casereader_force_error (r);
2727 /* Reads a number from R and stores its value in *D.
2728 If R is compressed, reads a compressed number;
2729 otherwise, reads a number in the regular way.
2730 Returns true if successful, false if end of file is
2731 reached immediately. */
2733 read_case_number (struct sfm_reader *r, double *d)
2735 if (r->compression == ANY_COMP_NONE)
2738 if (!try_read_bytes (r, number, sizeof number))
2740 float_convert (r->float_format, number, FLOAT_NATIVE_DOUBLE, d);
2744 return read_compressed_number (r, d);
2747 /* Reads LENGTH string bytes from R into S. Always reads a multiple of 8
2748 bytes; if LENGTH is not a multiple of 8, then extra bytes are read and
2749 discarded without being written to S. Reads compressed strings if S is
2750 compressed. Returns 1 if successful, 0 if end of file is reached
2751 immediately, or -1 for some kind of error. */
2753 read_case_string (struct sfm_reader *r, uint8_t *s, size_t length)
2755 size_t whole = ROUND_DOWN (length, 8);
2756 size_t partial = length % 8;
2760 int retval = read_whole_strings (r, s, whole);
2768 int retval = read_whole_strings (r, bounce, sizeof bounce);
2780 memcpy (s + whole, bounce, partial);
2786 /* Reads and returns the next compression opcode from R. */
2788 read_opcode (struct sfm_reader *r)
2790 assert (r->compression != ANY_COMP_NONE);
2794 if (r->opcode_idx >= sizeof r->opcodes)
2797 int retval = try_read_compressed_bytes (r, r->opcodes,
2803 opcode = r->opcodes[r->opcode_idx++];
2810 /* Reads a compressed number from R and stores its value in D.
2811 Returns true if successful, false if end of file is
2812 reached immediately. */
2814 read_compressed_number (struct sfm_reader *r, double *d)
2816 int opcode = read_opcode (r);
2824 return read_compressed_float (r, d);
2827 float_convert (r->float_format, " ", FLOAT_NATIVE_DOUBLE, d);
2828 if (!r->corruption_warning)
2830 r->corruption_warning = true;
2831 sys_warn (r, r->pos,
2832 _("Possible compressed data corruption: "
2833 "compressed spaces appear in numeric field."));
2842 *d = opcode - r->bias;
2849 /* Reads a compressed 8-byte string segment from R and stores it in DST. */
2851 read_compressed_string (struct sfm_reader *r, uint8_t *dst)
2856 opcode = read_opcode (r);
2864 retval = read_compressed_bytes (r, dst, 8);
2865 return retval == 1 ? 1 : -1;
2868 memset (dst, ' ', 8);
2873 double value = opcode - r->bias;
2874 float_convert (FLOAT_NATIVE_DOUBLE, &value, r->float_format, dst);
2877 /* This has actually been seen "in the wild". The submitter of the
2878 file that showed that the contents decoded as spaces, but they
2879 were at the end of the field so it's possible that the null
2880 bytes just acted as null terminators. */
2882 else if (!r->corruption_warning)
2884 r->corruption_warning = true;
2885 sys_warn (r, r->pos,
2886 _("Possible compressed data corruption: "
2887 "string contains compressed integer (opcode %d)."),
2895 /* Reads LENGTH string bytes from R into S. LENGTH must be a multiple of 8.
2896 Reads compressed strings if S is compressed. Returns 1 if successful, 0 if
2897 end of file is reached immediately, or -1 for some kind of error. */
2899 read_whole_strings (struct sfm_reader *r, uint8_t *s, size_t length)
2901 assert (length % 8 == 0);
2902 if (r->compression == ANY_COMP_NONE)
2903 return try_read_bytes (r, s, length);
2908 for (ofs = 0; ofs < length; ofs += 8)
2910 int retval = read_compressed_string (r, s + ofs);
2925 /* Skips LENGTH string bytes from R.
2926 LENGTH must be a multiple of 8.
2927 (LENGTH is also limited to 1024, but that's only because the
2928 current caller never needs more than that many bytes.)
2929 Returns true if successful, false if end of file is
2930 reached immediately. */
2932 skip_whole_strings (struct sfm_reader *r, size_t length)
2934 uint8_t buffer[1024];
2935 assert (length < sizeof buffer);
2936 return read_whole_strings (r, buffer, length);
2939 /* Helpers for reading records that contain structured text
2942 /* Maximum number of warnings to issue for a single text
2944 #define MAX_TEXT_WARNINGS 5
2949 struct substring buffer; /* Record contents. */
2950 off_t start; /* Starting offset in file. */
2951 size_t pos; /* Current position in buffer. */
2952 int n_warnings; /* Number of warnings issued or suppressed. */
2953 bool recoded; /* Recoded into UTF-8? */
2956 static struct text_record *
2957 open_text_record (struct sfm_reader *r,
2958 const struct sfm_extension_record *record,
2959 bool recode_to_utf8)
2961 struct text_record *text;
2962 struct substring raw;
2964 text = pool_alloc (r->pool, sizeof *text);
2965 raw = ss_buffer (record->data, record->size * record->count);
2966 text->start = record->pos;
2967 text->buffer = (recode_to_utf8
2968 ? recode_substring_pool ("UTF-8", r->encoding, raw, r->pool)
2971 text->n_warnings = 0;
2972 text->recoded = recode_to_utf8;
2977 /* Closes TEXT, frees its storage, and issues a final warning
2978 about suppressed warnings if necessary. */
2980 close_text_record (struct sfm_reader *r, struct text_record *text)
2982 if (text->n_warnings > MAX_TEXT_WARNINGS)
2983 sys_warn (r, -1, _("Suppressed %d additional related warnings."),
2984 text->n_warnings - MAX_TEXT_WARNINGS);
2986 pool_free (r->pool, ss_data (text->buffer));
2989 /* Reads a variable=value pair from TEXT.
2990 Looks up the variable in DICT and stores it into *VAR.
2991 Stores a null-terminated value into *VALUE. */
2993 read_variable_to_value_pair (struct sfm_reader *r, struct dictionary *dict,
2994 struct text_record *text,
2995 struct variable **var, char **value)
2999 if (!text_read_short_name (r, dict, text, ss_cstr ("="), var))
3002 *value = text_get_token (text, ss_buffer ("\t\0", 2), NULL);
3006 text->pos += ss_span (ss_substr (text->buffer, text->pos, SIZE_MAX),
3007 ss_buffer ("\t\0", 2));
3015 text_read_variable_name (struct sfm_reader *r, struct dictionary *dict,
3016 struct text_record *text, struct substring delimiters,
3017 struct variable **var)
3021 name = text_get_token (text, delimiters, NULL);
3025 *var = dict_lookup_var (dict, name);
3029 text_warn (r, text, _("Dictionary record refers to unknown variable %s."),
3036 text_read_short_name (struct sfm_reader *r, struct dictionary *dict,
3037 struct text_record *text, struct substring delimiters,
3038 struct variable **var)
3040 char *short_name = text_get_token (text, delimiters, NULL);
3041 if (short_name == NULL)
3044 *var = dict_lookup_var (dict, short_name);
3046 text_warn (r, text, _("Dictionary record refers to unknown variable %s."),
3051 /* Displays a warning for the current file position, limiting the
3052 number to MAX_TEXT_WARNINGS for TEXT. */
3054 text_warn (struct sfm_reader *r, struct text_record *text,
3055 const char *format, ...)
3057 if (text->n_warnings++ < MAX_TEXT_WARNINGS)
3061 va_start (args, format);
3062 sys_msg (r, text->start + text->pos, MW, format, args);
3068 text_get_token (struct text_record *text, struct substring delimiters,
3071 struct substring token;
3074 if (!ss_tokenize (text->buffer, delimiters, &text->pos, &token))
3077 end = &ss_data (token)[ss_length (token)];
3078 if (delimiter != NULL)
3081 return ss_data (token);
3084 /* Reads a integer value expressed in decimal, then a space, then a string that
3085 consists of exactly as many bytes as specified by the integer, then a space,
3086 from TEXT. Returns the string, null-terminated, as a subset of TEXT's
3087 buffer (so the caller should not free the string). */
3089 text_parse_counted_string (struct sfm_reader *r, struct text_record *text)
3097 while (text->pos < text->buffer.length)
3099 int c = text->buffer.string[text->pos];
3100 if (c < '0' || c > '9')
3102 n = (n * 10) + (c - '0');
3105 if (text->pos >= text->buffer.length || start == text->pos)
3107 sys_warn (r, text->start,
3108 _("Expecting digit at offset %zu in MRSETS record."),
3113 if (!text_match (text, ' '))
3115 sys_warn (r, text->start,
3116 _("Expecting space at offset %zu in MRSETS record."),
3121 if (text->pos + n > text->buffer.length)
3123 sys_warn (r, text->start,
3124 _("%zu-byte string starting at offset %zu "
3125 "exceeds record length %zu."),
3126 n, text->pos, text->buffer.length);
3130 s = &text->buffer.string[text->pos];
3133 sys_warn (r, text->start,
3134 _("Expecting space at offset %zu following %zu-byte string."),
3144 text_match (struct text_record *text, char c)
3146 if (text->pos >= text->buffer.length)
3149 if (text->buffer.string[text->pos] == c)
3158 /* Returns the current byte offset (as converted to UTF-8, if it was converted)
3159 inside the TEXT's string. */
3161 text_pos (const struct text_record *text)
3167 text_get_all (const struct text_record *text)
3169 return text->buffer.string;
3174 /* Displays a corruption message. */
3176 sys_msg (struct sfm_reader *r, off_t offset,
3177 int class, const char *format, va_list args)
3181 ds_init_empty (&text);
3183 ds_put_format (&text, _("`%s' near offset 0x%llx: "),
3184 fh_get_file_name (r->fh), (long long int) offset);
3186 ds_put_format (&text, _("`%s': "), fh_get_file_name (r->fh));
3187 ds_put_vformat (&text, format, args);
3190 .category = msg_class_to_category (class),
3191 .severity = msg_class_to_severity (class),
3192 .text = ds_cstr (&text),
3197 /* Displays a warning for offset OFFSET in the file. */
3199 sys_warn (struct sfm_reader *r, off_t offset, const char *format, ...)
3203 va_start (args, format);
3204 sys_msg (r, offset, MW, format, args);
3208 /* Displays an error for the current file position and marks it as in an error
3211 sys_error (struct sfm_reader *r, off_t offset, const char *format, ...)
3215 va_start (args, format);
3216 sys_msg (r, offset, ME, format, args);
3222 /* Reads BYTE_CNT bytes into BUF.
3223 Returns 1 if exactly BYTE_CNT bytes are successfully read.
3224 Returns -1 if an I/O error or a partial read occurs.
3225 Returns 0 for an immediate end-of-file and, if EOF_IS_OK is false, reports
3228 read_bytes_internal (struct sfm_reader *r, bool eof_is_ok,
3229 void *buf, size_t byte_cnt)
3231 size_t bytes_read = fread (buf, 1, byte_cnt, r->file);
3232 r->pos += bytes_read;
3233 if (bytes_read == byte_cnt)
3235 else if (ferror (r->file))
3237 sys_error (r, r->pos, _("System error: %s."), strerror (errno));
3240 else if (!eof_is_ok || bytes_read != 0)
3242 sys_error (r, r->pos, _("Unexpected end of file."));
3249 /* Reads BYTE_CNT into BUF.
3250 Returns true if successful.
3251 Returns false upon I/O error or if end-of-file is encountered. */
3253 read_bytes (struct sfm_reader *r, void *buf, size_t byte_cnt)
3255 return read_bytes_internal (r, false, buf, byte_cnt) == 1;
3258 /* Reads BYTE_CNT bytes into BUF.
3259 Returns 1 if exactly BYTE_CNT bytes are successfully read.
3260 Returns 0 if an immediate end-of-file is encountered.
3261 Returns -1 if an I/O error or a partial read occurs. */
3263 try_read_bytes (struct sfm_reader *r, void *buf, size_t byte_cnt)
3265 return read_bytes_internal (r, true, buf, byte_cnt);
3268 /* Reads a 32-bit signed integer from R and stores its value in host format in
3269 *X. Returns true if successful, otherwise false. */
3271 read_int (struct sfm_reader *r, int *x)
3274 if (read_bytes (r, integer, sizeof integer) != 1)
3276 *x = integer_get (r->integer_format, integer, sizeof integer);
3281 read_uint (struct sfm_reader *r, unsigned int *x)
3286 ok = read_int (r, &y);
3291 /* Reads a 64-bit signed integer from R and returns its value in
3294 read_int64 (struct sfm_reader *r, long long int *x)
3297 if (read_bytes (r, integer, sizeof integer) != 1)
3299 *x = integer_get (r->integer_format, integer, sizeof integer);
3303 /* Reads a 64-bit signed integer from R and returns its value in
3306 read_uint64 (struct sfm_reader *r, unsigned long long int *x)
3311 ok = read_int64 (r, &y);
3317 parse_int (const struct sfm_reader *r, const void *data, size_t ofs)
3319 return integer_get (r->integer_format, (const uint8_t *) data + ofs, 4);
3323 parse_float (const struct sfm_reader *r, const void *data, size_t ofs)
3325 return float_get_double (r->float_format, (const uint8_t *) data + ofs);
3328 /* Reads exactly SIZE - 1 bytes into BUFFER
3329 and stores a null byte into BUFFER[SIZE - 1]. */
3331 read_string (struct sfm_reader *r, char *buffer, size_t size)
3336 ok = read_bytes (r, buffer, size - 1);
3338 buffer[size - 1] = '\0';
3342 /* Skips BYTES bytes forward in R. */
3344 skip_bytes (struct sfm_reader *r, size_t bytes)
3349 size_t chunk = MIN (sizeof buffer, bytes);
3350 if (!read_bytes (r, buffer, chunk))
3358 /* Returns a malloc()'d copy of S in which all lone CRs and CR LF pairs have
3359 been replaced by LFs.
3361 (A product that identifies itself as VOXCO INTERVIEWER 4.3 produces system
3362 files that use CR-only line ends in the file label and extra product
3365 fix_line_ends (const char *s)
3369 d = dst = xmalloc (strlen (s) + 1);
3388 read_ztrailer (struct sfm_reader *r,
3389 long long int zheader_ofs,
3390 long long int ztrailer_len);
3393 zalloc (voidpf pool_, uInt items, uInt size)
3395 struct pool *pool = pool_;
3397 return (!size || xalloc_oversized (items, size)
3399 : pool_malloc (pool, items * size));
3403 zfree (voidpf pool_, voidpf address)
3405 struct pool *pool = pool_;
3407 pool_free (pool, address);
3411 read_zheader (struct sfm_reader *r)
3414 long long int zheader_ofs;
3415 long long int ztrailer_ofs;
3416 long long int ztrailer_len;
3418 if (!read_int64 (r, &zheader_ofs)
3419 || !read_int64 (r, &ztrailer_ofs)
3420 || !read_int64 (r, &ztrailer_len))
3423 if (zheader_ofs != pos)
3425 sys_error (r, pos, _("Wrong ZLIB data header offset %#llx "
3426 "(expected %#llx)."),
3427 zheader_ofs, (long long int) pos);
3431 if (ztrailer_ofs < r->pos)
3433 sys_error (r, pos, _("Impossible ZLIB trailer offset 0x%llx."),
3438 if (ztrailer_len < 24 || ztrailer_len % 24)
3440 sys_error (r, pos, _("Invalid ZLIB trailer length %lld."), ztrailer_len);
3444 r->ztrailer_ofs = ztrailer_ofs;
3445 if (!read_ztrailer (r, zheader_ofs, ztrailer_len))
3448 if (r->zin_buf == NULL)
3450 r->zin_buf = pool_malloc (r->pool, ZIN_BUF_SIZE);
3451 r->zout_buf = pool_malloc (r->pool, ZOUT_BUF_SIZE);
3452 r->zstream.next_in = NULL;
3453 r->zstream.avail_in = 0;
3456 r->zstream.zalloc = zalloc;
3457 r->zstream.zfree = zfree;
3458 r->zstream.opaque = r->pool;
3460 return open_zstream (r);
3464 seek (struct sfm_reader *r, off_t offset)
3466 if (fseeko (r->file, offset, SEEK_SET))
3467 sys_error (r, 0, _("%s: seek failed (%s)."),
3468 fh_get_file_name (r->fh), strerror (errno));
3472 /* Performs some additional consistency checks on the ZLIB compressed data
3475 read_ztrailer (struct sfm_reader *r,
3476 long long int zheader_ofs,
3477 long long int ztrailer_len)
3479 long long int expected_uncmp_ofs;
3480 long long int expected_cmp_ofs;
3483 unsigned int block_size;
3484 unsigned int n_blocks;
3488 if (fstat (fileno (r->file), &s))
3490 sys_error (r, 0, _("%s: stat failed (%s)."),
3491 fh_get_file_name (r->fh), strerror (errno));
3495 if (!S_ISREG (s.st_mode))
3497 /* We can't seek to the trailer and then back to the data in this file,
3498 so skip doing extra checks. */
3502 if (r->ztrailer_ofs + ztrailer_len != s.st_size)
3503 sys_warn (r, r->pos,
3504 _("End of ZLIB trailer (0x%llx) is not file size (0x%llx)."),
3505 r->ztrailer_ofs + ztrailer_len, (long long int) s.st_size);
3507 seek (r, r->ztrailer_ofs);
3509 /* Read fixed header from ZLIB data trailer. */
3510 if (!read_int64 (r, &bias))
3512 if (-bias != r->bias)
3514 sys_error (r, r->pos, _("ZLIB trailer bias (%lld) differs from "
3515 "file header bias (%.2f)."),
3520 if (!read_int64 (r, &zero))
3523 sys_warn (r, r->pos,
3524 _("ZLIB trailer \"zero\" field has nonzero value %lld."), zero);
3526 if (!read_uint (r, &block_size))
3528 if (block_size != ZBLOCK_SIZE)
3529 sys_warn (r, r->pos,
3530 _("ZLIB trailer specifies unexpected %u-byte block size."),
3533 if (!read_uint (r, &n_blocks))
3535 if (n_blocks != (ztrailer_len - 24) / 24)
3537 sys_error (r, r->pos,
3538 _("%lld-byte ZLIB trailer specifies %u data blocks (expected "
3540 ztrailer_len, n_blocks, (ztrailer_len - 24) / 24);
3544 expected_uncmp_ofs = zheader_ofs;
3545 expected_cmp_ofs = zheader_ofs + 24;
3546 for (i = 0; i < n_blocks; i++)
3548 off_t desc_ofs = r->pos;
3549 unsigned long long int uncompressed_ofs;
3550 unsigned long long int compressed_ofs;
3551 unsigned int uncompressed_size;
3552 unsigned int compressed_size;
3554 if (!read_uint64 (r, &uncompressed_ofs)
3555 || !read_uint64 (r, &compressed_ofs)
3556 || !read_uint (r, &uncompressed_size)
3557 || !read_uint (r, &compressed_size))
3560 if (uncompressed_ofs != expected_uncmp_ofs)
3562 sys_error (r, desc_ofs,
3563 _("ZLIB block descriptor %u reported uncompressed data "
3564 "offset %#llx, when %#llx was expected."),
3565 i, uncompressed_ofs, expected_uncmp_ofs);
3569 if (compressed_ofs != expected_cmp_ofs)
3571 sys_error (r, desc_ofs,
3572 _("ZLIB block descriptor %u reported compressed data "
3573 "offset %#llx, when %#llx was expected."),
3574 i, compressed_ofs, expected_cmp_ofs);
3578 if (i < n_blocks - 1)
3580 if (uncompressed_size != block_size)
3581 sys_warn (r, desc_ofs,
3582 _("ZLIB block descriptor %u reported block size %#x, "
3583 "when %#x was expected."),
3584 i, uncompressed_size, block_size);
3588 if (uncompressed_size > block_size)
3589 sys_warn (r, desc_ofs,
3590 _("ZLIB block descriptor %u reported block size %#x, "
3591 "when at most %#x was expected."),
3592 i, uncompressed_size, block_size);
3595 /* http://www.zlib.net/zlib_tech.html says that the maximum expansion
3596 from compression, with worst-case parameters, is 13.5% plus 11 bytes.
3597 This code checks for an expansion of more than 14.3% plus 11
3599 if (compressed_size > uncompressed_size + uncompressed_size / 7 + 11)
3601 sys_error (r, desc_ofs,
3602 _("ZLIB block descriptor %u reports compressed size %u "
3603 "and uncompressed size %u."),
3604 i, compressed_size, uncompressed_size);
3608 expected_uncmp_ofs += uncompressed_size;
3609 expected_cmp_ofs += compressed_size;
3612 if (expected_cmp_ofs != r->ztrailer_ofs)
3614 sys_error (r, r->pos, _("ZLIB trailer is at offset %#llx but %#llx "
3615 "would be expected from block descriptors."),
3616 r->ztrailer_ofs, expected_cmp_ofs);
3620 seek (r, zheader_ofs + 24);
3625 open_zstream (struct sfm_reader *r)
3629 r->zout_pos = r->zout_end = 0;
3630 error = inflateInit (&r->zstream);
3633 sys_error (r, r->pos, _("ZLIB initialization failed (%s)."),
3641 close_zstream (struct sfm_reader *r)
3645 error = inflateEnd (&r->zstream);
3648 sys_error (r, r->pos, _("Inconsistency at end of ZLIB stream (%s)."),
3656 read_bytes_zlib (struct sfm_reader *r, void *buf_, size_t byte_cnt)
3658 uint8_t *buf = buf_;
3667 /* Use already inflated data if there is any. */
3668 if (r->zout_pos < r->zout_end)
3670 unsigned int n = MIN (byte_cnt, r->zout_end - r->zout_pos);
3671 memcpy (buf, &r->zout_buf[r->zout_pos], n);
3680 /* We need to inflate some more data.
3681 Get some more input data if we don't have any. */
3682 if (r->zstream.avail_in == 0)
3684 unsigned int n = MIN (ZIN_BUF_SIZE, r->ztrailer_ofs - r->pos);
3689 int retval = try_read_bytes (r, r->zin_buf, n);
3692 r->zstream.avail_in = n;
3693 r->zstream.next_in = r->zin_buf;
3697 /* Inflate the (remaining) input data. */
3698 r->zstream.avail_out = ZOUT_BUF_SIZE;
3699 r->zstream.next_out = r->zout_buf;
3700 error = inflate (&r->zstream, Z_SYNC_FLUSH);
3702 r->zout_end = r->zstream.next_out - r->zout_buf;
3703 if (r->zout_end == 0)
3705 if (error != Z_STREAM_END)
3707 sys_error (r, r->pos, _("ZLIB stream inconsistency (%s)."),
3711 else if (!close_zstream (r) || !open_zstream (r))
3716 /* Process the output data and ignore 'error' for now. ZLIB will
3717 present it to us again on the next inflate() call. */
3723 read_compressed_bytes (struct sfm_reader *r, void *buf, size_t byte_cnt)
3725 if (r->compression == ANY_COMP_SIMPLE)
3726 return read_bytes (r, buf, byte_cnt);
3729 int retval = read_bytes_zlib (r, buf, byte_cnt);
3731 sys_error (r, r->pos, _("Unexpected end of ZLIB compressed data."));
3737 try_read_compressed_bytes (struct sfm_reader *r, void *buf, size_t byte_cnt)
3739 if (r->compression == ANY_COMP_SIMPLE)
3740 return try_read_bytes (r, buf, byte_cnt);
3742 return read_bytes_zlib (r, buf, byte_cnt);
3745 /* Reads a 64-bit floating-point number from R and returns its
3746 value in host format. */
3748 read_compressed_float (struct sfm_reader *r, double *d)
3752 if (!read_compressed_bytes (r, number, sizeof number))
3755 *d = float_get_double (r->float_format, number);
3759 static const struct casereader_class sys_file_casereader_class =
3761 sys_file_casereader_read,
3762 sys_file_casereader_destroy,
3767 const struct any_reader_class sys_file_reader_class =
3769 N_("SPSS System File"),