/*
* xtif_dir.c
*
* Extended TIFF Directory Tag Support.
*
* You may use this file as a template to add your own
* extended tags to the library. Only the parts of the code
* marked with "XXX" require modification. Three example tags
* are shown; you should replace them with your own.
*
* Author: Niles D. Ritter
*/
#include "xtiffiop.h"
#include <stdio.h>
/* Tiff info structure.
*
* Entry format:
* { TAGNUMBER, ReadCount, WriteCount, DataType, FIELDNUM,
* OkToChange, PassDirCountOnSet, AsciiName }
*
* For ReadCount, WriteCount, -1 = unknown; used for mult-valued
* tags and ASCII.
*/
static const TIFFFieldInfo xtiffFieldInfo[] = {
/* XXX Replace these example tags with your own extended tags */
{ TIFFTAG_EXAMPLE_MULTI, -1,-1, TIFF_DOUBLE, FIELD_EXAMPLE_MULTI,
TRUE, TRUE, "MyMultivaluedTag" },
{ TIFFTAG_EXAMPLE_SINGLE, 1, 1, TIFF_LONG, FIELD_EXAMPLE_SINGLE,
TRUE, FALSE, "MySingleLongTag" },
{ TIFFTAG_EXAMPLE_ASCII, -1,-1, TIFF_ASCII, FIELD_EXAMPLE_ASCII,
TRUE, FALSE, "MyAsciiTag" },
};
#define N(a) (sizeof (a) / sizeof (a[0]))
static void
_XTIFFPrintDirectory(TIFF* tif, FILE* fd, long flags)
{
xtiff *xt = XTIFFDIR(tif);
XTIFFDirectory *xd = &xt->xtif_dir;
int i,num;
/* call the inherited method */
if (PARENT(xt,printdir))
(PARENT(xt,printdir))(tif,fd,flags);
/* XXX Add field printing here. Replace the three example
* tags implemented below with your own.
*/
fprintf(fd,"--My Example Tags--\n");
/* Our first example tag may have a lot of values, so we
* will only print them out if the TIFFPRINT_MYMULTIDOUBLES
* flag is passed into the print method.
*/
if (TIFFFieldSet(tif,FIELD_EXAMPLE_MULTI))
{
fprintf(fd, " My Multi-Valued Doubles:");
if (flags & TIFFPRINT_MYMULTIDOUBLES)
{
double *value = xd->xd_example_multi;
num = xd->xd_num_multi;
fprintf(fd,"(");
for (i=0;i<num;i++) fprintf(fd, " %lg", *value++);
fprintf(fd,")\n");
} else
fprintf(fd, "(present)\n");
}
if (TIFFFieldSet(tif,FIELD_EXAMPLE_SINGLE))
{
fprintf(fd, " My Single Long Tag: %lu\n", xd->xd_example_single);
}
if (TIFFFieldSet(tif,FIELD_EXAMPLE_ASCII))
{
_TIFFprintAsciiTag(fd,"My ASCII Tag",
xd->xd_example_ascii);
}
}
static int
_XTIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
xtiff *xt = XTIFFDIR(tif);
XTIFFDirectory* xd = &xt->xtif_dir;
int status = 1;
uint32 v32=0;
int i=0, v=0;
va_list ap1 = ap;
/* va_start is called by the calling routine */
switch (tag) {
/*
* XXX put your extended tags here; replace the implemented
* example tags with your own.
*/
case TIFFTAG_EXAMPLE_MULTI:
/* multi-valued tags need to store the count as well */
xd->xd_num_multi = (uint16) va_arg(ap, int);
_TIFFsetDoubleArray(&xd->xd_example_multi, va_arg(ap, double*),
(long) xd->xd_num_multi);
break;
case TIFFTAG_EXAMPLE_SINGLE:
xd->xd_example_single = va_arg(ap, uint32);
break;
case TIFFTAG_EXAMPLE_ASCII:
_TIFFsetString(&xd->xd_example_ascii, va_arg(ap, char*));
break;
default:
/* call the inherited method */
return (PARENT(xt,vsetfield))(tif,tag,ap);
break;
}
if (status) {
/* we have to override the print method here,
* after the compression tags have gotten to it.
* This makes sense because the only time we would
* need the extended print method is if an extended
* tag is set by the reader.
*/
if (!(xt->xtif_flags & XTIFFP_PRINT))
{
PARENT(xt,printdir) = TIFFMEMBER(tif,printdir);
TIFFMEMBER(tif,printdir) = _XTIFFPrintDirectory;
xt->xtif_flags |= XTIFFP_PRINT;
}
TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
tif->tif_flags |= TIFF_DIRTYDIRECT;
}
va_end(ap);
return (status);
badvalue:
TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%d: Bad value for \"%s\"", v,
_TIFFFieldWithTag(tif, tag)->field_name);
va_end(ap);
return (0);
badvalue32:
TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "%ld: Bad value for \"%s\"", v32,
_TIFFFieldWithTag(tif, tag)->field_name);
va_end(ap);
return (0);
}
static int
_XTIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
{
xtiff *xt = XTIFFDIR(tif);
XTIFFDirectory* xd = &xt->xtif_dir;
switch (tag) {
/*
* XXX put your extended tags here; replace the implemented
* example tags with your own.
*/
case TIFFTAG_EXAMPLE_MULTI:
*va_arg(ap, uint16*) = xd->xd_num_multi;
*va_arg(ap, double**) = xd->xd_example_multi;
break;
case TIFFTAG_EXAMPLE_ASCII:
*va_arg(ap, char**) = xd->xd_example_ascii;
break;
case TIFFTAG_EXAMPLE_SINGLE:
*va_arg(ap, uint32*) = xd->xd_example_single;
break;
default:
/* return inherited method */
return (PARENT(xt,vgetfield))(tif,tag,ap);
break;
}
return (1);
}
#define CleanupField(member) { \
if (xd->member) { \
_TIFFfree(xd->member); \
xd->member = 0; \
} \
}
/*
* Release storage associated with a directory.
*/
static void
_XTIFFFreeDirectory(xtiff* xt)
{
XTIFFDirectory* xd = &xt->xtif_dir;
/*
* XXX - Purge all Your allocated memory except
* for the xtiff directory itself. This includes
* all fields that require a _TIFFsetXXX call in
* _XTIFFVSetField().
*/
CleanupField(xd_example_multi);
CleanupField(xd_example_ascii);
}
#undef CleanupField
static void _XTIFFLocalDefaultDirectory(TIFF *tif)
{
xtiff *xt = XTIFFDIR(tif);
XTIFFDirectory* xd = &xt->xtif_dir;
/* Install the extended Tag field info */
_TIFFMergeFieldInfo(tif, xtiffFieldInfo, N(xtiffFieldInfo));
/*
* free up any dynamically allocated arrays
* before the new directory is read in.
*/
_XTIFFFreeDirectory(xt);
_TIFFmemset(xt,0,sizeof(xtiff));
/* Override the tag access methods */
PARENT(xt,vsetfield) = TIFFMEMBER(tif,vsetfield);
TIFFMEMBER(tif,vsetfield) = _XTIFFVSetField;
PARENT(xt,vgetfield) = TIFFMEMBER(tif,vgetfield);
TIFFMEMBER(tif,vgetfield) = _XTIFFVGetField;
/*
* XXX Set up any default values here.
*/
xd->xd_example_single = 234;
}
/**********************************************************************
* Nothing below this line should need to be changed.
**********************************************************************/
static TIFFExtendProc _ParentExtender;
/*
* This is the callback procedure, and is
* called by the DefaultDirectory method
* every time a new TIFF directory is opened.
*/
static void
_XTIFFDefaultDirectory(TIFF *tif)
{
xtiff *xt;
/* Allocate Directory Structure if first time, and install it */
if (!(tif->tif_flags & XTIFF_INITIALIZED))
{
xt = _TIFFmalloc(sizeof(xtiff));
if (!xt)
{
/* handle memory allocation failure here ! */
return;
}
_TIFFmemset(xt,0,sizeof(xtiff));
/*
* Install into TIFF structure.
*/
TIFFMEMBER(tif,clientdir) = (tidata_t)xt;
tif->tif_flags |= XTIFF_INITIALIZED; /* dont do this again! */
}
/* set up our own defaults */
_XTIFFLocalDefaultDirectory(tif);
/* Since an XTIFF client module may have overridden
* the default directory method, we call it now to
* allow it to set up the rest of its own methods.
*/
if (_ParentExtender)
(*_ParentExtender)(tif);
}
/*
* XTIFF Initializer -- sets up the callback
* procedure for the TIFF module.
*/
static
void _XTIFFInitialize(void)
{
static first_time=1;
if (! first_time) return; /* Been there. Done that. */
first_time = 0;
/* Grab the inherited method and install */
_ParentExtender = TIFFSetTagExtender(_XTIFFDefaultDirectory);
}
/*
* Public File I/O Routines.
*/
TIFF*
XTIFFOpen(const char* name, const char* mode)
{
/* Set up the callback */
_XTIFFInitialize();
/* Open the file; the callback will set everything up
*/
return TIFFOpen(name, mode);
}
TIFF*
XTIFFFdOpen(int fd, const char* name, const char* mode)
{
/* Set up the callback */
_XTIFFInitialize();
/* Open the file; the callback will set everything up
*/
return TIFFFdOpen(fd, name, mode);
}
void
XTIFFClose(TIFF *tif)
{
xtiff *xt = XTIFFDIR(tif);
/* call inherited function first */
TIFFClose(tif);
/* Free up extended allocated memory */
_XTIFFFreeDirectory(xt);
_TIFFfree(xt);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* fill-column: 78
* End:
*/