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#ifndef lint
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static const char RCSid[] = "$Id: header.c,v 2.37 2019/08/14 19:52:39 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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* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
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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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#include "copyright.h"
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#include <ctype.h>
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#include "tiff.h" /* for int32 */
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#include "rtio.h"
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#include "resolu.h"
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#define MAXLINE 2048
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extern time_t timegm(struct tm *tm);
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const char HDRSTR[] = "#?"; /* information header magic number */
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const char FMTSTR[] = "FORMAT="; /* format identifier */
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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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const char BIGEND[] = "BigEndian="; /* big-endian variable */
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static gethfunc mycheck;
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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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putc('\n', fp);
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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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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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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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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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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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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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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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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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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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void
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printargs( /* print arguments to a file */
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int ac,
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char **av,
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FILE *fp
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)
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{
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while (ac-- > 0) {
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fputword(*av++, fp);
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fputc(ac ? ' ' : '\n', fp);
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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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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) return(1);
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do
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*r++ = *s++;
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while (*s && !isspace(*s) && r-fmt < MAXFMTLEN-1);
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*r = '\0';
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return(1);
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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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fputs(FMTSTR, fp);
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fputs(s, fp);
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putc('\n', fp);
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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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u.i = 1;
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return(u.c[0] == 0);
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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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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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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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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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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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struct check {
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FILE *fp;
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char fs[MAXFMTLEN];
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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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if (!formatval(scp->fs, s) && scp->fp != NULL)
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return(fputs(s, scp->fp));
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return(0);
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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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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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p++;
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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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* 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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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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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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}
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