1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2006 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 "sys-file-writer.h"
20 #include "sys-file-private.h"
30 #include <libpspp/alloc.h>
31 #include <libpspp/hash.h>
32 #include <libpspp/magic.h>
33 #include <libpspp/message.h>
34 #include <libpspp/misc.h>
35 #include <libpspp/str.h>
36 #include <libpspp/version.h>
38 #include <data/case.h>
39 #include <data/casewriter-provider.h>
40 #include <data/casewriter.h>
41 #include <data/dictionary.h>
42 #include <data/file-handle-def.h>
43 #include <data/format.h>
44 #include <data/missing-values.h>
45 #include <data/settings.h>
46 #include <data/short-names.h>
47 #include <data/value-labels.h>
48 #include <data/variable.h>
53 #define _(msgid) gettext (msgid)
55 /* Find 64-bit floating-point type. */
58 #define FLT64_MAX FLT_MAX
59 #elif SIZEOF_DOUBLE == 8
61 #define FLT64_MAX DBL_MAX
62 #elif SIZEOF_LONG_DOUBLE == 8
63 #define flt64 long double
64 #define FLT64_MAX LDBL_MAX
66 #error Which one of your basic types is 64-bit floating point?
69 /* Figure out SYSMIS value for flt64. */
70 #include <libpspp/magic.h>
71 #if SIZEOF_DOUBLE == 8
72 #define second_lowest_flt64 second_lowest_value
74 #error Must define second_lowest_flt64 for your architecture.
77 /* Record Type 1: General Information. */
80 char rec_type[4] ; /* 00: Record-type code, "$FL2". */
81 char prod_name[60] ; /* 04: Product identification. */
82 int32_t layout_code ; /* 40: 2. */
83 int32_t nominal_case_size ; /* 44: Number of `value's per case.
84 Note: some systems set this to -1 */
85 int32_t compress ; /* 48: 1=compressed, 0=not compressed. */
86 int32_t weight_idx ; /* 4c: 1-based index of weighting var, or 0. */
87 int32_t case_cnt ; /* 50: Number of cases, -1 if unknown. */
88 flt64 bias ; /* 54: Compression bias (100.0). */
89 char creation_date[9] ; /* 5c: `dd mmm yy' creation date of file. */
90 char creation_time[8] ; /* 65: `hh:mm:ss' 24-hour creation time. */
91 char file_label[64] ; /* 6d: File label. */
92 char padding[3] ; /* ad: Ignored padding. */
93 } ATTRIBUTE((packed)) ;
95 /* Record Type 2: Variable. */
96 struct sysfile_variable
98 int32_t rec_type ; /* 2. */
99 int32_t type ; /* 0=numeric, 1-255=string width,
100 -1=continued string. */
101 int32_t has_var_label ; /* 1=has a variable label, 0=doesn't. */
102 int32_t n_missing_values ; /* Missing value code of -3,-2,0,1,2, or 3. */
103 int32_t print ; /* Print format. */
104 int32_t write ; /* Write format. */
105 char name[SHORT_NAME_LEN] ; /* Variable name. */
106 /* The rest of the structure varies. */
107 } ATTRIBUTE((packed)) ;
109 /* Compression bias used by PSPP. Values between (1 -
110 COMPRESSION_BIAS) and (251 - COMPRESSION_BIAS) inclusive can be
112 #define COMPRESSION_BIAS 100
114 /* System file writer. */
117 struct file_handle *fh; /* File handle. */
118 FILE *file; /* File stream. */
120 int needs_translation; /* 0=use fast path, 1=translation needed. */
121 int compress; /* 1=compressed, 0=not compressed. */
122 int case_cnt; /* Number of cases written so far. */
123 size_t flt64_cnt; /* Number of flt64 elements in case. */
124 bool has_vls; /* Does the dict have very long strings? */
126 /* Compression buffering. */
127 flt64 *buf; /* Buffered data. */
128 flt64 *end; /* Buffer end. */
129 flt64 *ptr; /* Current location in buffer. */
130 unsigned char *x; /* Location in current instruction octet. */
131 unsigned char *y; /* End of instruction octet. */
134 struct sfm_var *vars; /* Variables. */
135 size_t var_cnt; /* Number of variables. */
136 size_t var_cnt_vls; /* Number of variables including
137 very long string components. */
140 /* A variable in a system file. */
143 int width; /* 0=numeric, otherwise string width. */
144 int fv; /* Index into case. */
145 size_t flt64_cnt; /* Number of flt64 elements. */
148 static struct casewriter_class sys_file_casewriter_class;
150 static char *append_string_max (char *, const char *, const char *);
151 static void write_header (struct sfm_writer *, const struct dictionary *);
152 static void buf_write (struct sfm_writer *, const void *, size_t);
153 static void write_variable (struct sfm_writer *, const struct variable *);
154 static void write_value_labels (struct sfm_writer *,
155 struct variable *, int idx);
156 static void write_rec_7_34 (struct sfm_writer *);
158 static void write_longvar_table (struct sfm_writer *w,
159 const struct dictionary *dict);
161 static void write_vls_length_table (struct sfm_writer *w,
162 const struct dictionary *dict);
165 static void write_variable_display_parameters (struct sfm_writer *w,
166 const struct dictionary *dict);
168 static void write_documents (struct sfm_writer *, const struct dictionary *);
170 bool write_error (const struct sfm_writer *);
171 bool close_writer (struct sfm_writer *);
174 var_flt64_cnt (const struct variable *v)
176 assert(sizeof(flt64) == MAX_SHORT_STRING);
177 return sfm_width_to_bytes(var_get_width (v)) / MAX_SHORT_STRING ;
181 var_flt64_cnt_nom (const struct variable *v)
183 return (var_is_numeric (v)
184 ? 1 : DIV_RND_UP (var_get_width (v), sizeof (flt64)));
188 /* Returns default options for writing a system file. */
189 struct sfm_write_options
190 sfm_writer_default_options (void)
192 struct sfm_write_options opts;
193 opts.create_writeable = true;
194 opts.compress = get_scompression ();
199 /* Opens the system file designated by file handle FH for writing
200 cases from dictionary D according to the given OPTS. If
201 COMPRESS is nonzero, the system file will be compressed.
203 No reference to D is retained, so it may be modified or
204 destroyed at will after this function returns. D is not
205 modified by this function, except to assign short names. */
207 sfm_open_writer (struct file_handle *fh, struct dictionary *d,
208 struct sfm_write_options opts)
210 struct sfm_writer *w = NULL;
217 if (opts.version != 2 && opts.version != 3)
219 msg (ME, _("Unknown system file version %d. Treating as version %d."),
225 mode = S_IRUSR | S_IRGRP | S_IROTH;
226 if (opts.create_writeable)
227 mode |= S_IWUSR | S_IWGRP | S_IWOTH;
228 fd = open (fh_get_file_name (fh), O_WRONLY | O_CREAT | O_TRUNC, mode);
232 /* Open file handle. */
233 if (!fh_open (fh, FH_REF_FILE, "system file", "we"))
236 /* Create and initialize writer. */
237 w = xmalloc (sizeof *w);
239 w->file = fdopen (fd, "w");
241 w->needs_translation = dict_compacting_would_change (d);
242 w->compress = opts.compress;
247 w->buf = w->end = w->ptr = NULL;
250 w->var_cnt = dict_get_var_cnt (d);
251 w->var_cnt_vls = w->var_cnt;
252 w->vars = xnmalloc (w->var_cnt, sizeof *w->vars);
253 for (i = 0; i < w->var_cnt; i++)
255 const struct variable *dv = dict_get_var (d, i);
256 struct sfm_var *sv = &w->vars[i];
257 sv->width = var_get_width (dv);
258 /* spss compatibility nonsense */
259 if ( var_get_width (dv) >= MIN_VERY_LONG_STRING )
262 sv->fv = var_get_case_index (dv);
263 sv->flt64_cnt = var_flt64_cnt (dv);
266 /* Check that file create succeeded. */
273 /* Write the file header. */
276 /* Write basic variable info. */
277 short_names_assign (d);
278 for (i = 0; i < dict_get_var_cnt (d); i++)
281 const struct variable *v = dict_get_var(d, i);
282 int wcount = var_get_width (v);
285 struct variable *var_cont = var_clone (v);
286 var_set_short_name (var_cont, 0, var_get_short_name (v, 0));
287 if ( var_is_alpha (v))
291 var_clear_missing_values (var_cont);
292 var_set_short_name (var_cont, 0,
293 var_get_short_name (v, count));
294 var_clear_label (var_cont);
298 if ( wcount >= MIN_VERY_LONG_STRING )
300 var_set_width (var_cont, MIN_VERY_LONG_STRING - 1);
301 wcount -= EFFECTIVE_LONG_STRING_LENGTH;
305 var_set_width (var_cont, wcount);
306 wcount -= var_get_width (var_cont);
310 write_variable (w, var_cont);
311 var_destroy (var_cont);
315 /* Write out value labels. */
316 for (idx = i = 0; i < dict_get_var_cnt (d); i++)
318 struct variable *v = dict_get_var (d, i);
320 write_value_labels (w, v, idx);
321 idx += var_flt64_cnt (v);
324 if (dict_get_documents (d) != NULL)
325 write_documents (w, d);
329 write_variable_display_parameters (w, d);
331 if (opts.version >= 3)
332 write_longvar_table (w, d);
334 write_vls_length_table(w, d);
336 /* Write end-of-headers record. */
342 } ATTRIBUTE((packed))
345 rec_999.rec_type = 999;
348 buf_write (w, &rec_999, sizeof rec_999);
353 w->buf = xnmalloc (128, sizeof *w->buf);
355 w->end = &w->buf[128];
356 w->x = (unsigned char *) w->ptr++;
357 w->y = (unsigned char *) w->ptr;
363 return casewriter_create (&sys_file_casewriter_class, w);
370 msg (ME, _("Error opening \"%s\" for writing as a system file: %s."),
371 fh_get_file_name (fh), strerror (errno));
375 /* Returns value of X truncated to two least-significant digits. */
386 /* Write the sysfile_header header to system file W. */
388 write_header (struct sfm_writer *w, const struct dictionary *d)
390 struct sysfile_header hdr;
396 memcpy (hdr.rec_type, "$FL2", 4);
398 p = stpcpy (hdr.prod_name, "@(#) SPSS DATA FILE ");
399 p = append_string_max (p, version, &hdr.prod_name[60]);
400 p = append_string_max (p, " - ", &hdr.prod_name[60]);
401 p = append_string_max (p, host_system, &hdr.prod_name[60]);
402 memset (p, ' ', &hdr.prod_name[60] - p);
407 for (i = 0; i < dict_get_var_cnt (d); i++)
409 w->flt64_cnt += var_flt64_cnt (dict_get_var (d, i));
411 hdr.nominal_case_size = w->flt64_cnt;
413 hdr.compress = w->compress;
415 if (dict_get_weight (d) != NULL)
417 const struct variable *weight_var;
418 int recalc_weight_idx = 1;
421 weight_var = dict_get_weight (d);
424 struct variable *v = dict_get_var (d, i);
427 recalc_weight_idx += var_flt64_cnt (v);
429 hdr.weight_idx = recalc_weight_idx;
435 hdr.bias = COMPRESSION_BIAS;
437 if (time (&t) == (time_t) -1)
439 memcpy (hdr.creation_date, "01 Jan 70", 9);
440 memcpy (hdr.creation_time, "00:00:00", 8);
444 static const char *month_name[12] =
446 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
447 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
449 struct tm *tmp = localtime (&t);
450 int day = rerange (tmp->tm_mday);
451 int mon = rerange (tmp->tm_mon + 1);
452 int year = rerange (tmp->tm_year);
453 int hour = rerange (tmp->tm_hour + 1);
454 int min = rerange (tmp->tm_min + 1);
455 int sec = rerange (tmp->tm_sec + 1);
458 sprintf (buf, "%02d %s %02d", day, month_name[mon - 1], year);
459 memcpy (hdr.creation_date, buf, sizeof hdr.creation_date);
460 sprintf (buf, "%02d:%02d:%02d", hour - 1, min - 1, sec - 1);
461 memcpy (hdr.creation_time, buf, sizeof hdr.creation_time);
465 const char *label = dict_get_label (d);
469 buf_copy_str_rpad (hdr.file_label, sizeof hdr.file_label, label);
472 memset (hdr.padding, 0, sizeof hdr.padding);
474 buf_write (w, &hdr, sizeof hdr);
477 /* Translates format spec from internal form in SRC to system file
480 write_format_spec (const struct fmt_spec *src, int32_t *dest)
482 assert (fmt_check_output (src));
483 *dest = (fmt_to_io (src->type) << 16) | (src->w << 8) | src->d;
486 /* Write the variable record(s) for primary variable P and secondary
487 variable S to system file W. */
489 write_variable (struct sfm_writer *w, const struct variable *v)
491 struct sysfile_variable sv;
493 /* Missing values. */
494 struct missing_values mv;
495 flt64 m[3]; /* Missing value values. */
496 int nm; /* Number of missing values, possibly negative. */
497 const char *label = var_get_label (v);
500 sv.type = MIN (var_get_width (v), MIN_VERY_LONG_STRING - 1);
501 sv.has_var_label = label != NULL;
503 mv_copy (&mv, var_get_missing_values (v));
505 if (mv_has_range (&mv))
508 mv_pop_range (&mv, &x, &y);
509 m[nm++] = x == LOWEST ? second_lowest_flt64 : x;
510 m[nm++] = y == HIGHEST ? FLT64_MAX : y;
512 while (mv_has_value (&mv))
515 mv_pop_value (&mv, &value);
516 if (var_is_numeric (v))
519 buf_copy_rpad ((char *) &m[nm], sizeof m[nm], value.s,
523 if (mv_has_range (var_get_missing_values (v)))
526 sv.n_missing_values = nm;
527 write_format_spec (var_get_print_format (v), &sv.print);
528 write_format_spec (var_get_write_format (v), &sv.write);
529 buf_copy_str_rpad (sv.name, sizeof sv.name, var_get_short_name (v, 0));
530 buf_write (w, &sv, sizeof sv);
538 } ATTRIBUTE((packed))
543 l.label_len = MIN (strlen (label), 255);
544 ext_len = ROUND_UP (l.label_len, sizeof l.label_len);
545 memcpy (l.label, label, l.label_len);
546 memset (&l.label[l.label_len], ' ', ext_len - l.label_len);
548 buf_write (w, &l, offsetof (struct label, label) + ext_len);
552 buf_write (w, m, sizeof *m * abs (nm));
554 if (var_is_alpha (v) && var_get_width (v) > (int) sizeof (flt64))
560 sv.has_var_label = 0;
561 sv.n_missing_values = 0;
562 memset (&sv.print, 0, sizeof sv.print);
563 memset (&sv.write, 0, sizeof sv.write);
564 memset (&sv.name, 0, sizeof sv.name);
566 pad_count = DIV_RND_UP (MIN(var_get_width (v), MIN_VERY_LONG_STRING - 1),
567 (int) sizeof (flt64)) - 1;
568 for (i = 0; i < pad_count; i++)
569 buf_write (w, &sv, sizeof sv);
573 /* Writes the value labels for variable V having system file
574 variable index IDX to system file W. */
576 write_value_labels (struct sfm_writer *w, struct variable *v, int idx)
578 struct value_label_rec
583 } ATTRIBUTE((packed));
590 } ATTRIBUTE((packed));
592 const struct val_labs *val_labs;
593 struct val_labs_iterator *i;
594 struct value_label_rec *vlr;
595 struct var_idx_rec vir;
600 val_labs = var_get_value_labels (v);
601 if (val_labs == NULL)
604 /* Pass 1: Count bytes. */
605 vlr_size = (sizeof (struct value_label_rec)
606 + sizeof (flt64) * (val_labs_count (val_labs) - 1));
607 for (vl = val_labs_first (val_labs, &i); vl != NULL;
608 vl = val_labs_next (val_labs, &i))
609 vlr_size += ROUND_UP (strlen (vl->label) + 1, sizeof (flt64));
611 /* Pass 2: Copy bytes. */
612 vlr = xmalloc (vlr_size);
614 vlr->n_labels = val_labs_count (val_labs);
616 for (vl = val_labs_first_sorted (val_labs, &i); vl != NULL;
617 vl = val_labs_next (val_labs, &i))
619 size_t len = strlen (vl->label);
621 *loc++ = vl->value.f;
622 *(unsigned char *) loc = len;
623 memcpy (&((char *) loc)[1], vl->label, len);
624 memset (&((char *) loc)[1 + len], ' ',
625 REM_RND_UP (len + 1, sizeof (flt64)));
626 loc += DIV_RND_UP (len + 1, sizeof (flt64));
629 buf_write (w, vlr, vlr_size);
634 vir.vars[0] = idx + 1;
635 buf_write (w, &vir, sizeof vir);
638 /* Writes record type 6, document record. */
640 write_documents (struct sfm_writer *w, const struct dictionary *d)
644 int32_t rec_type ; /* Always 6. */
645 int32_t n_lines ; /* Number of lines of documents. */
646 } ATTRIBUTE((packed)) rec_6;
648 const char * documents = dict_get_documents (d);
649 size_t doc_bytes = strlen (documents);
651 assert (doc_bytes % 80 == 0);
654 rec_6.n_lines = doc_bytes / 80;
655 buf_write (w, &rec_6, sizeof rec_6);
656 buf_write (w, documents, 80 * rec_6.n_lines);
659 /* Write the alignment, width and scale values */
661 write_variable_display_parameters (struct sfm_writer *w,
662 const struct dictionary *dict)
672 } ATTRIBUTE((packed)) vdp_hdr;
674 vdp_hdr.rec_type = 7;
675 vdp_hdr.subtype = 11;
676 vdp_hdr.elem_size = 4;
677 vdp_hdr.n_elem = w->var_cnt_vls * 3;
679 buf_write (w, &vdp_hdr, sizeof vdp_hdr);
681 for ( i = 0 ; i < w->var_cnt ; ++i )
689 } ATTRIBUTE((packed)) params;
691 v = dict_get_var(dict, i);
693 params.measure = (var_get_measure (v) == MEASURE_NOMINAL ? 1
694 : var_get_measure (v) == MEASURE_ORDINAL ? 2
696 params.width = var_get_display_width (v);
697 params.align = (var_get_alignment (v) == ALIGN_LEFT ? 0
698 : var_get_alignment (v) == ALIGN_RIGHT ? 1
701 buf_write (w, ¶ms, sizeof(params));
703 if (var_is_long_string (v))
705 int wcount = var_get_width (v) - EFFECTIVE_LONG_STRING_LENGTH ;
709 params.width = wcount >= MIN_VERY_LONG_STRING ? 32 : wcount;
711 buf_write (w, ¶ms, sizeof(params));
713 wcount -= EFFECTIVE_LONG_STRING_LENGTH ;
719 /* Writes the table of lengths for Very Long String Variables */
721 write_vls_length_table (struct sfm_writer *w,
722 const struct dictionary *dict)
731 } ATTRIBUTE((packed)) vls_hdr;
733 struct string vls_length_map;
735 ds_init_empty (&vls_length_map);
737 vls_hdr.rec_type = 7;
738 vls_hdr.subtype = 14;
739 vls_hdr.elem_size = 1;
742 for (i = 0; i < dict_get_var_cnt (dict); ++i)
744 const struct variable *v = dict_get_var (dict, i);
746 if ( var_get_width (v) < MIN_VERY_LONG_STRING )
749 ds_put_format (&vls_length_map, "%s=%05d",
750 var_get_short_name (v, 0), var_get_width (v));
751 ds_put_char (&vls_length_map, '\0');
752 ds_put_char (&vls_length_map, '\t');
755 vls_hdr.n_elem = ds_length (&vls_length_map);
757 if ( vls_hdr.n_elem > 0 )
759 buf_write (w, &vls_hdr, sizeof vls_hdr);
760 buf_write (w, ds_data (&vls_length_map), ds_length (&vls_length_map));
763 ds_destroy (&vls_length_map);
766 /* Writes the long variable name table */
768 write_longvar_table (struct sfm_writer *w, const struct dictionary *dict)
776 } ATTRIBUTE((packed)) lv_hdr;
778 struct string long_name_map;
781 ds_init_empty (&long_name_map);
782 for (i = 0; i < dict_get_var_cnt (dict); i++)
784 struct variable *v = dict_get_var (dict, i);
787 ds_put_char (&long_name_map, '\t');
788 ds_put_format (&long_name_map, "%s=%s",
789 var_get_short_name (v, 0), var_get_name (v));
794 lv_hdr.elem_size = 1;
795 lv_hdr.n_elem = ds_length (&long_name_map);
797 buf_write (w, &lv_hdr, sizeof lv_hdr);
798 buf_write (w, ds_data (&long_name_map), ds_length (&long_name_map));
800 ds_destroy (&long_name_map);
803 /* Writes record type 7, subtypes 3 and 4. */
805 write_rec_7_34 (struct sfm_writer *w)
811 int32_t data_type_3 ;
816 int32_t data_type_4 ;
819 } ATTRIBUTE((packed)) rec_7;
821 /* Components of the version number, from major to minor. */
822 int version_component[3];
824 /* Used to step through the version string. */
827 /* Parses the version string, which is assumed to be of the form
828 #.#x, where each # is a string of digits, and x is a single
830 version_component[0] = strtol (bare_version, &p, 10);
833 version_component[1] = strtol (bare_version, &p, 10);
834 version_component[2] = (isalpha ((unsigned char) *p)
835 ? tolower ((unsigned char) *p) - 'a' : 0);
837 rec_7.rec_type_3 = 7;
839 rec_7.data_type_3 = sizeof (int32_t);
841 rec_7.elem_3[0] = version_component[0];
842 rec_7.elem_3[1] = version_component[1];
843 rec_7.elem_3[2] = version_component[2];
844 rec_7.elem_3[3] = -1;
846 /* PORTME: 1=IEEE754, 2=IBM 370, 3=DEC VAX E. */
853 /* PORTME: 1=big-endian, 2=little-endian. */
860 /* PORTME: 1=EBCDIC, 2=7-bit ASCII, 3=8-bit ASCII, 4=DEC Kanji. */
863 rec_7.rec_type_4 = 7;
865 rec_7.data_type_4 = sizeof (flt64);
867 rec_7.elem_4[0] = -FLT64_MAX;
868 rec_7.elem_4[1] = FLT64_MAX;
869 rec_7.elem_4[2] = second_lowest_flt64;
871 buf_write (w, &rec_7, sizeof rec_7);
874 /* Write NBYTES starting at BUF to the system file represented by
877 buf_write (struct sfm_writer *w, const void *buf, size_t nbytes)
879 assert (buf != NULL);
880 fwrite (buf, nbytes, 1, w->file);
883 /* Copies string DEST to SRC with the proviso that DEST does not reach
884 byte END; no null terminator is copied. Returns a pointer to the
885 byte after the last byte copied. */
887 append_string_max (char *dest, const char *src, const char *end)
889 int nbytes = MIN (end - dest, (int) strlen (src));
890 memcpy (dest, src, nbytes);
891 return dest + nbytes;
894 /* Makes certain that the compression buffer of H has room for another
895 element. If there's not room, pads out the current instruction
896 octet with zero and dumps out the buffer. */
898 ensure_buf_space (struct sfm_writer *w)
900 if (w->ptr >= w->end)
902 memset (w->x, 0, w->y - w->x);
905 buf_write (w, w->buf, sizeof *w->buf * 128);
909 static void write_compressed_data (struct sfm_writer *w, const flt64 *elem);
911 /* Writes case C to system file W. */
913 sys_file_casewriter_write (struct casewriter *writer, void *w_,
916 struct sfm_writer *w = w_;
917 if (ferror (w->file))
919 casewriter_force_error (writer);
926 if (!w->needs_translation && !w->compress
927 && sizeof (flt64) == sizeof (union value) && ! w->has_vls )
929 /* Fast path: external and internal representations are the
930 same and the dictionary is properly ordered. Write
932 buf_write (w, case_data_all (c), sizeof (union value) * w->flt64_cnt);
936 /* Slow path: internal and external representations differ.
937 Write into a bounce buffer, then write to W. */
944 bounce_size = sizeof *bounce * w->flt64_cnt;
945 bounce = bounce_cur = local_alloc (bounce_size);
946 bounce_end = bounce + bounce_size;
948 for (i = 0; i < w->var_cnt; i++)
950 struct sfm_var *v = &w->vars[i];
952 memset(bounce_cur, ' ', v->flt64_cnt * sizeof (flt64));
956 *bounce_cur = case_num_idx (c, v->fv);
957 bounce_cur += v->flt64_cnt;
961 while (ofs < v->width)
963 int chunk = MIN (MIN_VERY_LONG_STRING - 1, v->width - ofs);
964 int nv = DIV_RND_UP (chunk, sizeof (flt64));
965 buf_copy_rpad ((char *) bounce_cur, nv * sizeof (flt64),
966 case_data_idx (c, v->fv)->s + ofs, chunk);
975 buf_write (w, bounce, bounce_size);
977 write_compressed_data (w, bounce);
986 sys_file_casewriter_destroy (struct casewriter *writer, void *w_)
988 struct sfm_writer *w = w_;
989 if (!close_writer (w))
990 casewriter_force_error (writer);
994 put_instruction (struct sfm_writer *w, unsigned char instruction)
998 ensure_buf_space (w);
999 w->x = (unsigned char *) w->ptr++;
1000 w->y = (unsigned char *) w->ptr;
1002 *w->x++ = instruction;
1006 put_element (struct sfm_writer *w, const flt64 *elem)
1008 ensure_buf_space (w);
1009 memcpy (w->ptr++, elem, sizeof *elem);
1013 write_compressed_data (struct sfm_writer *w, const flt64 *elem)
1017 for (i = 0; i < w->var_cnt; i++)
1019 struct sfm_var *v = &w->vars[i];
1023 if (*elem == -FLT64_MAX)
1024 put_instruction (w, 255);
1025 else if (*elem >= 1 - COMPRESSION_BIAS
1026 && *elem <= 251 - COMPRESSION_BIAS
1027 && *elem == (int) *elem)
1028 put_instruction (w, (int) *elem + COMPRESSION_BIAS);
1031 put_instruction (w, 253);
1032 put_element (w, elem);
1040 for (j = 0; j < v->flt64_cnt; j++, elem++)
1042 if (!memcmp (elem, " ", sizeof (flt64)))
1043 put_instruction (w, 254);
1046 put_instruction (w, 253);
1047 put_element (w, elem);
1054 /* Returns true if an I/O error has occurred on WRITER, false otherwise. */
1056 write_error (const struct sfm_writer *writer)
1058 return ferror (writer->file);
1061 /* Closes a system file after we're done with it.
1062 Returns true if successful, false if an I/O error occurred. */
1064 close_writer (struct sfm_writer *w)
1072 if (w->file != NULL)
1075 if (w->buf != NULL && w->ptr > w->buf)
1077 memset (w->x, 0, w->y - w->x);
1078 buf_write (w, w->buf, (w->ptr - w->buf) * sizeof *w->buf);
1082 ok = !write_error (w);
1084 /* Seek back to the beginning and update the number of cases.
1085 This is just a courtesy to later readers, so there's no need
1086 to check return values or report errors. */
1087 if (ok && !fseek (w->file, offsetof (struct sysfile_header, case_cnt),
1090 int32_t case_cnt = w->case_cnt;
1091 fwrite (&case_cnt, sizeof case_cnt, 1, w->file);
1095 if (fclose (w->file) == EOF)
1099 msg (ME, _("An I/O error occurred writing system file \"%s\"."),
1100 fh_get_file_name (w->fh));
1103 fh_close (w->fh, "system file", "we");
1112 static struct casewriter_class sys_file_casewriter_class =
1114 sys_file_casewriter_write,
1115 sys_file_casewriter_destroy,