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#ifndef lint |
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static const char RCSid[] = "$Id: header.c,v 2.50 2025/06/06 19:11:21 greg Exp $"; |
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#endif |
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/* |
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* header.c - routines for reading and writing information headers. |
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* |
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* Externals declared in rtio.h |
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* |
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* newheader(t,fp) start new information header identified by string t |
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* headidval(r,s) copy header identifier value in s to r |
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* dateval(t,s) get capture date value as UTC |
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* gmtval(t,s) get GMT as UTC |
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* fputdate(t,fp) put out the given UTC |
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* fputnow(fp) put out the current date and time |
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* formatval(r,s) copy the format value in s to r |
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* fputformat(s,fp) write "FORMAT=%s" to fp |
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* nativebigendian() are we native on big-endian machine? |
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* isbigendian(s) header line matches "BigEndian=1" (-1 if irrelevant) |
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* fputendian(fp) write native endianness in BigEndian= line |
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* getheader(fp,f,p) read header from fp, calling f(s,p) on each line |
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* globmatch(pat, str) check for glob match of str against pat |
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* checkheader(i,p,o) check header format from i against p and copy to o |
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* |
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* To copy header from input to output, use getheader(fin, fputs, fout) |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <ctype.h> |
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|
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#include "tiff.h" /* for int32 */ |
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#include "rtio.h" |
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#include "color.h" |
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#include "resolu.h" |
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|
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#define MAXLINE 2048 |
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|
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extern time_t timegm(struct tm *tm); |
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|
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const char HDRSTR[] = "#?"; /* information header magic number */ |
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|
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const char FMTSTR[] = "FORMAT="; /* format identifier */ |
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|
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const char TMSTR[] = "CAPDATE="; /* capture date identifier */ |
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const char GMTSTR[] = "GMT="; /* GMT identifier */ |
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|
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const char BIGEND[] = "BigEndian="; /* big-endian variable */ |
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|
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static gethfunc mycheck; |
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|
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|
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void |
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newheader( /* identifying line of information header */ |
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const char *s, |
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FILE *fp |
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) |
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{ |
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fputs(HDRSTR, fp); |
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fputs(s, fp); |
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fputc('\n', fp); |
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} |
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|
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|
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int |
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headidval( /* get header id (return true if is id) */ |
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char *r, |
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const char *s |
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) |
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{ |
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const char *cp = HDRSTR; |
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|
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while (*cp) if (*cp++ != *s++) return(0); |
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if (r == NULL) return(1); |
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while (*s && !isspace(*s)) *r++ = *s++; |
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*r = '\0'; |
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return(1); |
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} |
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|
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|
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int |
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dateval( /* convert capture date line to UTC */ |
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time_t *tloc, |
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const char *s |
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) |
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{ |
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struct tm tms; |
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const char *cp = TMSTR; |
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|
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while (*cp) if (*cp++ != *s++) return(0); |
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while (isspace(*s)) s++; |
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if (!*s) return(0); |
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if (sscanf(s, "%d:%d:%d %d:%d:%d", |
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&tms.tm_year, &tms.tm_mon, &tms.tm_mday, |
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&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6) |
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return(0); |
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if (tloc == NULL) |
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return(1); |
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tms.tm_mon--; |
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tms.tm_year -= 1900; |
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tms.tm_isdst = -1; /* ask mktime() to figure out DST */ |
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*tloc = mktime(&tms); |
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return(1); |
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} |
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|
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|
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int |
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gmtval( /* convert GMT date line to UTC */ |
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time_t *tloc, |
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const char *s |
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) |
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{ |
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struct tm tms; |
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const char *cp = GMTSTR; |
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|
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while (*cp) if (*cp++ != *s++) return(0); |
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while (isspace(*s)) s++; |
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if (!*s) return(0); |
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if (sscanf(s, "%d:%d:%d %d:%d:%d", |
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&tms.tm_year, &tms.tm_mon, &tms.tm_mday, |
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&tms.tm_hour, &tms.tm_min, &tms.tm_sec) != 6) |
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return(0); |
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if (tloc == NULL) |
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return(1); |
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tms.tm_mon--; |
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tms.tm_year -= 1900; |
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*tloc = timegm(&tms); |
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return(1); |
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} |
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|
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|
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void |
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fputdate( /* write out the given time value (local & GMT) */ |
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time_t tv, |
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FILE *fp |
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) |
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{ |
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struct tm *tms; |
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|
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tms = localtime(&tv); |
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if (tms != NULL) |
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fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", TMSTR, |
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tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday, |
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tms->tm_hour, tms->tm_min, tms->tm_sec); |
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tms = gmtime(&tv); |
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if (tms != NULL) |
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fprintf(fp, "%s %04d:%02d:%02d %02d:%02d:%02d\n", GMTSTR, |
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tms->tm_year+1900, tms->tm_mon+1, tms->tm_mday, |
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tms->tm_hour, tms->tm_min, tms->tm_sec); |
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} |
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|
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|
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void |
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fputnow( /* write out the current time */ |
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FILE *fp |
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) |
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{ |
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time_t tv; |
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time(&tv); |
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fputdate(tv, fp); |
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} |
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|
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|
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int |
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formatval( /* get format value (return true if format) */ |
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char fmt[MAXFMTLEN], |
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const char *s |
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) |
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{ |
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const char *cp = FMTSTR; |
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char *r = fmt; |
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/* check against format string */ |
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while (*cp) if (*cp++ != *s++) return(0); |
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while (isspace(*s)) s++; |
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if (!*s) return(0); |
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if (r == NULL) /* just checking if format? */ |
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return(1); |
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do /* copy format ID */ |
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*r++ = *s++; |
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while (*s && r-fmt < MAXFMTLEN-1); |
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|
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do /* remove trailing white space */ |
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*r-- = '\0'; |
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while (r > fmt && isspace(*r)); |
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|
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return(1); |
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} |
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|
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|
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void |
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fputformat( /* put out a format value */ |
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const char *s, |
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FILE *fp |
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) |
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{ |
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int align = 0; |
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|
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fputs(FMTSTR, fp); |
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fputs(s, fp); |
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/* pad to align binary type for mmap() */ |
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if (globmatch(PICFMT, s)) |
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align = 0; /* not needed for picture data */ |
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else if (!strncmp("float", s, 5)) |
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align = sizeof(float); |
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else if (!strncmp("double", s, 6)) |
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align = sizeof(double); |
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else if (!strncmp("16-bit", s, 6)) |
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align = 2; |
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else if (!strncmp("32-bit", s, 6)) |
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align = 4; |
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else if (!strncmp("64-bit", s, 6)) |
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align = 8; |
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if (align) { |
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long pos = ftell(fp); |
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if (pos >= 0) { |
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pos = (pos + 2) % align; |
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if (pos) align -= pos; |
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else align = 0; |
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} else |
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align = 0; |
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} |
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while (align-- > 0) |
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putc(' ', fp); |
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fputc('\n', fp); |
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} |
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|
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|
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int |
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nativebigendian() /* are we native on a big-endian machine? */ |
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{ |
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union { int32 i; char c[4]; } u; |
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|
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u.i = 1; |
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|
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return(u.c[0] == 0); |
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} |
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|
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|
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int |
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isbigendian( /* header line says "BigEndian=1" (-1 if irrelevant) */ |
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const char *s |
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) |
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{ |
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const char *be = BIGEND; |
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|
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while ((*s != '\0') & (*be != '=') && *s++ == *be) |
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++be; |
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if (*be != '=') |
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return(-1); /* irrelevant */ |
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while (isspace(*s)) |
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s++; |
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if (*s++ != '=') |
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return(-1); |
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while (isspace(*s)) |
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s++; |
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return(*s == '1'); |
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} |
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|
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|
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void |
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fputendian( /* write native endianness in BigEndian= line */ |
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FILE *fp |
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) |
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{ |
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fputs(BIGEND, fp); |
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if (nativebigendian()) |
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fputs("1\n", fp); |
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else |
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fputs("0\n", fp); |
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} |
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|
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|
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int |
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getheader( /* get header from file */ |
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FILE *fp, |
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gethfunc *f, |
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void *p |
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) |
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{ |
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int rtotal = 0; |
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char buf[MAXLINE]; |
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int firstc = fgetc(fp); |
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|
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if (!isprint(firstc)) |
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return(-1); /* messed up */ |
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ungetc(firstc, fp); |
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for ( ; ; ) { |
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int rval = 0; |
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buf[MAXLINE-2] = '\n'; |
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if (fgets(buf, MAXLINE, fp) == NULL) |
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return(-1); |
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if (buf[buf[0]=='\r'] == '\n') /* end of header? */ |
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return(rtotal); |
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if (buf[MAXLINE-2] != '\n') { |
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ungetc(buf[MAXLINE-2], fp); /* prevent false end */ |
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buf[MAXLINE-2] = '\0'; |
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} |
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if (f != NULL && (rval = (*f)(buf, p)) < 0) |
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return(-1); |
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rtotal += rval; |
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} |
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} |
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|
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|
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struct check { |
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FILE *fp; |
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char fs[MAXFMTLEN]; |
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}; |
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|
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|
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static int |
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mycheck( /* check a header line for format info. */ |
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char *s, |
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void *cp |
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) |
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{ |
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struct check *scp = (struct check *)cp; |
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|
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if (!formatval(scp->fs, s) && scp->fp != NULL) |
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return(fputs(s, scp->fp)); |
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|
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return(0); |
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} |
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|
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|
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int |
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globmatch( /* check for match of s against pattern p */ |
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const char *p, |
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const char *s |
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) |
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{ |
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int setmatch; |
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|
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do { |
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switch (*p) { |
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case '?': /* match any character */ |
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if (!*s++) |
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return(0); |
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break; |
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case '*': /* match any string */ |
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while (p[1] == '*') p++; |
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do |
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if ( (p[1]=='?') | (p[1]==*s) && |
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globmatch(p+1,s) ) |
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return(1); |
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while (*s++); |
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return(0); |
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case '[': /* character set */ |
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setmatch = (*s == *++p); |
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if (!*p) |
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return(0); |
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while (*++p != ']') { |
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if (!*p) |
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return(0); |
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if (*p == '-') { |
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setmatch += (p[-1] <= *s) & (*s <= p[1]); |
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if (!*++p) |
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break; |
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} else |
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setmatch += (*p == *s); |
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} |
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if (!setmatch) |
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return(0); |
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s++; |
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break; |
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case '\\': /* literal next */ |
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if (!*++p) |
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return(0); |
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/* fall through */ |
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default: /* normal character */ |
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if (*p != *s) |
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return(0); |
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s++; |
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break; |
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} |
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} while (*p++); |
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return(1); |
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} |
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|
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|
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/* |
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* Checkheader(fin,fmt,fout) returns a value of 1 if the input format |
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* matches the specification in fmt, 0 if no input format was found, |
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* and -1 if the input format does not match or there is an |
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* error reading the header. If fmt is empty, then -1 is returned |
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* if any input format is found (or there is an error), and 0 otherwise. |
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* If fmt contains any '*' or '?' characters, then checkheader |
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* does wildcard expansion and copies a matching result into fmt. |
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* Be sure that fmt is big enough to hold the match in such cases, |
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* and that it is not a static, read-only string! |
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* The input header (minus any format lines) is copied to fout |
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* if fout is not NULL. |
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*/ |
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|
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int |
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checkheader( |
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FILE *fin, |
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char fmt[MAXFMTLEN], |
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FILE *fout |
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) |
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{ |
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struct check cdat; |
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char *cp; |
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|
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cdat.fp = fout; |
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cdat.fs[0] = '\0'; |
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if (getheader(fin, mycheck, &cdat) < 0) |
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return(-1); |
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if (!cdat.fs[0]) |
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return(0); |
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for (cp = fmt; *cp; cp++) /* check for globbing */ |
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if ((*cp == '?') | (*cp == '*')) { |
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if (globmatch(fmt, cdat.fs)) { |
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strcpy(fmt, cdat.fs); |
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return(1); |
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} else |
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return(-1); |
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} |
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return(strcmp(fmt, cdat.fs) ? -1 : 1); /* literal match */ |
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} |
