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#include <xos.h>
#include "fitsy.h"
/*
*
* ft_tableheader -- read a string that details the structure
* of the event record and generate a fitsy table header
*
* The structure of the string is:
*
* [name]:[n][type]:[(lodim:)hidim]
*
* Data types follow standard conventions for FITS binary tables, but include
* two extra unsigned types ('U' and 'V'):
*
* B -- unsigned 8-bit char
* I -- signed 16-bit int
* J -- signed 32-bit int
* K -- signed 64-bit int
* E -- 32-bit float
* D -- 64-bit float
* U -- unsigned 16-bit int
* V -- unsigned 32-bit int
*
* An optional integer value n can be prefixed to the type to indicate
* that the element actually is an array of n values.
*
* Furthermore, image dimensions are attached to the event specification
* in order to tell FITS how to bin the events into an image. They
* follow the conventions for the FITS TLMIN, TLMAX, and TALEN
* keywords. If the low image dimension is not specified, it defaults to
* 1. Thus:
*
* RAWX:J:1:100
* RAWX:J:100
*
* both specify that the dimension of this column runs from 1 to 100.
* Note that it is required that all padding be specified in the record
* definition.
*
*
* For example, suppose a FITS binary table has the following set of column
* definitions:
*
*
* TTYPE1 = 'X ' / Label for field
* TFORM1 = '1I ' / Data type for field
* TLMIN1 = 1 / Min. axis value
* TLMAX1 = 10 / Max. axis value
* TTYPE2 = 'Y ' / Label for field
* TFORM2 = '1I ' / Data type for field
* TLMIN2 = 2 / Min. axis value
* TLMAX2 = 11 / Max. axis value
* TTYPE3 = 'PHA ' / Label for field
* TFORM3 = '1I ' / Data type for field
* TTYPE4 = 'PI ' / Label for field
* TFORM4 = '1J ' / Data type for field
* TTYPE5 = 'TIME ' / Label for field
* TFORM5 = '1D ' / Data type for field
* TTYPE6 = 'DX ' / Label for field
* TFORM6 = '1E ' / Data type for field
* TLMIN6 = 1 / Min. axis value
* TLMAX6 = 10 / Max. axis value
* TTYPE7 = 'DY ' / Label for field
* TFORM7 = '1E ' / Data type for field
* TLMIN7 = 3 / Min. axis value
* TLMAX7 = 12 / Max. axis value
*
* An raw event file containing these same data would have the event
* specification:
*
* X:I:10,Y:I:2:11,PHA:I,PI:J,TIME:D,DX:E:10,DY:E:3:12
*
*/
FITSHead ft_tableheader(char *eventdef, int nev)
{
FITSHead header;
char type[SZ_LINE];
char name[SZ_LINE];
char dim[SZ_LINE];
char *neventdef = NULL;
char *nevdef;
char *d, *n, *s, *t, u[2];
char **names, **types, **dims;
char *extname="EVENTS";
int extver=1;
int cols, width, got;
int i, r;
int *lodims, *hidims, *widths;
/* init the fitsy header */
header = ft_headinit(NULL, 0);
/* get rid of enclosing parens */
if(*eventdef == '('){
NewString(neventdef, eventdef+1);
i = strlen(neventdef);
if( neventdef[i-1] == ')' )
neventdef[i-1] = '\0';
}
else{
NewString(neventdef, eventdef);
}
/* we only deal with upper case in FITS */
for(nevdef=neventdef; *nevdef; nevdef++){
if( islower((int)*nevdef) )
*nevdef = toupper(*nevdef);
}
/* first count the number of columns we have specified,
separated by ',' */
for(s=neventdef, cols=1; *s; s++){
if( *s == ',' )
cols++;
}
/* allocate string space for each column */
names = (char **)calloc(cols, sizeof(char *));
types = (char **)calloc(cols, sizeof(char *));
dims = (char **)calloc(cols, sizeof(char *));
lodims = (int *)calloc(cols, sizeof(int));
hidims = (int *)calloc(cols, sizeof(int));
widths = (int *)calloc(cols, sizeof(int));
/* process the string and gather up the information */
for(s=neventdef, width=0, got=0; *s; ){
/* get name */
n=name;
*n = '\0';
while( *s && (*s != ':') )
*n++ = *s++;
*n = '\0';
NewString(names[got], name);
/* skip delim */
if( *s == ':' )
s++;
if( *s == '\0' )
break;
/* get type, which might be preceded by a count */
r = strtol(s, &t, 10);
if( s != t )
s = t;
else
r = 1;
/* cast unsupported unsigned type, if necessary */
u[0] = *s;
u[1] = '\0';
snprintf(type, SZ_LINE, "%d%c", r, *u);
NewString(types[got], type);
width += ft_sizeof(*u)*r;
widths[got] = ft_sizeof(*u);
/* bump past type character */
s++;
/* get optional image dimension */
if( *s == ':' ){
/* skip past ':' */
s++;
*dim = '\0';
for( d=dim; *s && (*s != ',') && (*s != ':'); )
*d++ = *s++;
*d = '\0';
NewString(dims[got], dim);
if( *s == ':' ){
lodims[got] = atoi(dims[got]);
s++;
*dim = '\0';
for( d=dim; *s && (*s != ','); )
*d++ = *s++;
*d = '\0';
hidims[got] = atoi(dim);
}
else{
lodims[got] = 0;
hidims[got] = atoi(dims[got])-1;
}
if( *s == ',' )
s++;
}
else
dims[got] = NULL;
/* bump past the comma */
if( *s == ',' )
s++;
/* done with another header value */
got++;
}
/* fake the header to a binary table */
ft_headsets(header, "XTENSION", 0, "BINTABLE", "FITS BINARY TABLE", 1);
ft_headseti(header, "BITPIX", 0, 8, "Binary data", 1);
ft_headseti(header, "NAXIS", 0, 2, "Table is a matrix", 1);
ft_headseti(header, "NAXIS", 1, width, "Width of table in bytes", 1);
ft_headseti(header, "NAXIS", 2, nev, "Number of entries in table", 1);
ft_headseti(header, "PCOUNT", 0, 0, "Random parameter count", 1);
ft_headseti(header, "GCOUNT", 0, 1, "Group count", 1);
ft_headseti(header, "TFIELDS", 0, got, "Number of fields in each row", 1);
ft_headsets(header, "EXTNAME", 0, extname, "Table name", 1);
ft_headseti(header, "EXTVER", 0, extver, "Version number of table", 1);
/* info for each column */
for(i=0; i<got; i++){
ft_headsets(header, "TFORM", i+1, types[i], "Data type for field", 1);
ft_headsets(header, "TTYPE", i+1, names[i], "Label for field", 1);
if( dims[i] != NULL ){
ft_headseti(header, "TLMIN", i+1, lodims[i], "Min. axis value", 1);
ft_headseti(header, "TLMAX", i+1, hidims[i], "Max. axis value", 1);
}
}
/* now turn this into a table header */
ft_syncdata(header);
/* free up the column strings */
for(i=0; i<cols; i++){
if( names[i] ) free(names[i]);
if( types[i] ) free(types[i]);
if( dims[i] ) free(dims[i]);
}
if( names ) free(names);
if( types ) free(types);
if( dims ) free(dims);
if( lodims ) free(lodims);
if( hidims ) free(hidims);
if( widths ) free(widths);
if( neventdef ) free(neventdef);
return header;
}
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