2 * Header file for routines to read and write Survex ".3d" image files
3 * Copyright (C) Olly Betts 1993,1994,1997,2001,2002,2003,2004,2005,2006,2010,2011,2012,2013,2014,2016,2018
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 /* Define IMG_API_VERSION if you want more recent versions of the img API.
25 * 0 (default) The old API. date1 and date2 give the survey date as time_t.
26 * Set to 0 for "unknown".
27 * 1 days1 and days2 give survey dates as days since 1st Jan 1900.
28 * Set to -1 for "unknown".
30 #ifndef IMG_API_VERSION
31 # define IMG_API_VERSION 0
32 #elif IMG_API_VERSION > 1
33 # error IMG_API_VERSION > 1 too new
41 #include <time.h> /* for time_t */
47 /* NB: img_CROSS is never output and ignored on input.
48 * Put crosses where labels are. */
49 /* # define img_CROSS 2 */
52 # define img_XSECT_END 5
53 /* Loop closure information for the *preceding* traverse (img_MOVE + one or
55 # define img_ERROR_INFO 6
58 # define img_FLAG_SURFACE 0x01
59 # define img_FLAG_DUPLICATE 0x02
60 # define img_FLAG_SPLAY 0x04
63 # define img_SFLAG_SURFACE 0x01
64 # define img_SFLAG_UNDERGROUND 0x02
65 # define img_SFLAG_ENTRANCE 0x04
66 # define img_SFLAG_EXPORTED 0x08
67 # define img_SFLAG_FIXED 0x10
68 # define img_SFLAG_ANON 0x20
69 # define img_SFLAG_WALL 0x40
72 # define img_FFLAG_EXTENDED 0x80
74 /* When writing img_XSECT, img_XFLAG_END in pimg->flags means this is the last
75 * img_XSECT in this tube:
77 # define img_XFLAG_END 0x01
79 # define img_STYLE_UNKNOWN -1
80 # define img_STYLE_NORMAL 0
81 # define img_STYLE_DIVING 1
82 # define img_STYLE_CARTESIAN 2
83 # define img_STYLE_CYLPOLAR 3
84 # define img_STYLE_NOSURVEY 4
86 /* 3D coordinates (in metres) */
92 /* Members you can access when reading (don't touch when writing): */
96 /* If the coordinate system was specified, this contains a PROJ4 string
97 * describing it. If not, this member will be NULL.
100 /* Older .3d format versions stored a human readable datestamp string.
101 * Format versions >= 8 versions store a string consisting of "@" followed
102 * by the number of seconds since midnight UTC on 1/1/1970. Some foreign
103 * formats contain a human readable string, others no date information
104 * (which results in "?" being returned).
107 /* The datestamp as a time_t (or (time_t)-1 if not available).
109 * For 3d format versions >= 8, this is a reliable value and in UTC. Older
110 * 3d format versions store a human readable time, which img will attempt
111 * to decode, but it may fail, particularly with handling timezones. Even
112 * if it does work, beware that times in local time where DST applies are
113 * inherently ambiguous around when the clocks go back.
115 * CMAP XYZ files contain a timestamp. It's probably in localtime (but
116 * without any timezone information) and the example files are all pre-2000
117 * and have two digit years. We do our best to turn these into a useful
120 time_t datestamp_numeric
;
121 char separator
; /* character used to separate survey levels ('.' usually) */
123 /* Members that can be set when writing: */
124 #if IMG_API_VERSION == 0
126 #else /* IMG_API_VERSION == 1 */
131 /* Error information - valid when img_ERROR_INFO is returned: */
136 /* The filename actually opened (e.g. may have ".3d" added).
138 * This is only set if img opened the filename - if an existing stream
139 * is used (via img_read_stream() or similar) then this member will be
142 char * filename_opened
;
144 /* Non-zero if reading an extended elevation: */
145 int is_extended_elevation
;
147 /* Members that can be set when writing: */
148 /* The style of the data - one of the img_STYLE_* constants above */
151 /* All other members are for internal use only: */
152 FILE *fh
; /* file handle of image file */
153 int (*close_func
)(FILE*);
157 int fRead
; /* 1 for reading, 0 for writing */
159 /* version of file format:
160 * -4 => CMAP .xyz file, shot format
161 * -3 => CMAP .xyz file, station format
162 * -2 => Compass .plt file
166 * 2 => byte actions and flags
167 * 3 => prefixes for legs; compressed prefixes
171 * 7 => more compact dates with wider range
172 * 8 => lots of changes
177 int pending
; /* for old style text format files and survey filtering */
179 #if IMG_API_VERSION == 0
180 time_t olddate1
, olddate2
;
181 #else /* IMG_API_VERSION == 1 */
182 int olddays1
, olddays2
;
187 /* Which version of the file format to output (defaults to newest) */
188 extern unsigned int img_output_version
;
190 /* Minimum supported value for img_output_version: */
191 #define IMG_VERSION_MIN 1
193 /* Maximum supported value for img_output_version: */
194 #define IMG_VERSION_MAX 8
196 /* Open a .3d file for reading
198 * fnm is the filename
200 * Returns pointer to an img struct or NULL
202 #define img_open(F) img_open_survey((F), NULL)
204 /* Open a .3d file for reading
206 * fnm is the filename
208 * survey points to a survey name to restrict reading to (or NULL for all
209 * survey data in the file)
211 * Returns pointer to an img struct or NULL
213 img
*img_open_survey(const char *fnm
, const char *survey
);
215 /* Read processed survey data from an existing stream.
217 * stream is a FILE* open on the stream (can be NULL which will give error
218 * IMG_FILENOTFOUND so you don't need to handle that case specially). The
219 * stream should be opened for reading in binary mode and positioned at the
220 * start of the survey data file.
222 * close_func is a function to call to close the stream (most commonly
223 * fclose, or pclose if the stream was opened using popen()) or NULL if
224 * the caller wants to take care of closing the stream.
226 * filename is used to determine the format based on the file extension,
227 * and also the leafname with the extension removed is used for the survey
228 * title for formats which don't support a title or when no title is
229 * specified. If you're not interested in default titles, you can just
230 * pass the extension including a leading "." - e.g. ".3d". May not be
233 * Returns pointer to an img struct or NULL on error. Any close function
234 * specified is called on error (unless stream is NULL).
236 #define img_read_stream(S, C, F) img_read_stream_survey((S), (C), (F), NULL)
238 /* Read processed survey data from an existing stream.
240 * stream is a FILE* open on the stream (can be NULL which will give error
241 * IMG_FILENOTFOUND so you don't need to handle that case specially). The
242 * stream should be opened for reading in binary mode and positioned at the
243 * start of the survey data file.
245 * close_func is a function to call to close the stream (most commonly
246 * fclose, or pclose if the stream was opened using popen()) or NULL if
247 * the caller wants to take care of closing the stream.
249 * filename is used to determine the format based on the file extension,
250 * and also the leafname with the extension removed is used for the survey
251 * title for formats which don't support a title or when no title is
252 * specified. If you're not interested in default titles, you can just
253 * pass the extension including a leading "." - e.g. ".3d". filename must
256 * survey points to a survey name to restrict reading to (or NULL for all
257 * survey data in the file)
259 * Returns pointer to an img struct or NULL on error. Any close function
260 * specified is called on error.
262 img
*img_read_stream_survey(FILE *stream
, int (*close_func
)(FILE*),
263 const char *filename
,
266 /* Open a .3d file for output with no specified coordinate system
268 * This is a very thin wrapper around img_open_write_cs() which passes NULL for
269 * cs, provided for compatibility with the API provided before support for
270 * coordinate systems was added.
272 * See img_open_write_cs() for documentation.
274 #define img_open_write(F, T, S) img_open_write_cs(F, T, NULL, S)
276 /* Open a .3d file for output in a specified coordinate system
278 * fnm is the filename
282 * cs is a PROJ4 string describing the coordinate system (or NULL to not
283 * specify a coordinate system).
285 * flags contains a bitwise-or of any file-wide flags - currently only one
286 * is available: img_FFLAG_EXTENDED.
288 * Returns pointer to an img struct or NULL for error (check img_error()
291 img
*img_open_write_cs(const char *fnm
, const char *title
, const char * cs
,
294 /* Write a .3d file to a stream
296 * stream is a FILE* open on the stream (can be NULL which will give error
297 * IMG_FILENOTFOUND so you don't need to handle that case specially). The
298 * stream should be opened for writing in binary mode.
300 * close_func is a function to call to close the stream (most commonly
301 * fclose, or pclose if the stream was opened using popen()) or NULL if
302 * the caller wants to take care of closing the stream.
306 * cs is a PROJ4 string describing the coordinate system (or NULL to not
307 * specify a coordinate system).
309 * flags contains a bitwise-or of any file-wide flags - currently only one
310 * is available: img_FFLAG_EXTENDED.
312 * Returns pointer to an img struct or NULL for error (check img_error()
313 * for details). Any close function specified is called on error (unless
316 img
*img_write_stream(FILE *stream
, int (*close_func
)(FILE*),
317 const char *title
, const char * cs
, int flags
);
319 /* Read an item from a .3d file
321 * pimg is a pointer to an img struct returned by img_open()
323 * coordinates are returned in p
325 * flags and label name are returned in fields in pimg
327 * Returns img_XXXX as #define-d above
329 int img_read_item(img
*pimg
, img_point
*p
);
331 /* Write a item to a .3d file
333 * pimg is a pointer to an img struct returned by img_open_write()
335 * code is one of the img_XXXX #define-d above
337 * flags is the leg, station, or xsect flags
338 * (meaningful for img_LINE, img_LABEL, and img_XSECT respectively)
340 * s is the label (only meaningful for img_LABEL)
342 * x, y, z are the coordinates
344 void img_write_item(img
*pimg
, int code
, int flags
, const char *s
,
345 double x
, double y
, double z
);
347 /* Write error information for the current traverse
349 * n_legs is the number of legs in the traverse
351 * length is the traverse length (in m)
353 * E is the ratio of the observed misclosure to the theoretical one
355 * H is the ratio of the observed horizontal misclosure to the theoretical one
357 * V is the ratio of the observed vertical misclosure to the theoretical one
359 void img_write_errors(img
*pimg
, int n_legs
, double length
,
360 double E
, double H
, double V
);
362 /* rewind a .3d file opened for reading so the data can be read in
365 * pimg is a pointer to an img struct returned by img_open()
367 * Returns: non-zero for success, zero for error (check img_error() for
370 int img_rewind(img
*pimg
);
374 * pimg is a pointer to an img struct returned by img_open() or
377 * Returns: non-zero for success, zero for error (check img_error() for
380 int img_close(img
*pimg
);
382 /* Codes returned by img_error */
384 IMG_NONE
= 0, IMG_FILENOTFOUND
, IMG_OUTOFMEMORY
,
385 IMG_CANTOPENOUT
, IMG_BADFORMAT
, IMG_DIRECTORY
,
386 IMG_READERROR
, IMG_WRITEERROR
, IMG_TOONEW
389 /* Read the error code
391 * If img_open(), img_open_survey() or img_open_write() returns NULL, or
392 * img_rewind() or img_close() returns 0, or img_read_item() returns img_BAD
393 * then you can call this function to discover why.
395 img_errcode
img_error(void);