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src/Source/LibTIFF4/tif_unix.c  view on Meta::CPAN

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

#ifdef HAVE_IO_H
# include <io.h>
#endif

#include "tiffiop.h"

static tmsize_t
_tiffReadProc(thandle_t fd, void* buf, tmsize_t size)
{
	size_t size_io = (size_t) size;
	if ((tmsize_t) size_io != size)
	{
		errno=EINVAL;
		return (tmsize_t) -1;
	}
	return ((tmsize_t) read((int) fd, buf, size_io));
}

static tmsize_t
_tiffWriteProc(thandle_t fd, void* buf, tmsize_t size)
{
	size_t size_io = (size_t) size;
	if ((tmsize_t) size_io != size)
	{
		errno=EINVAL;
		return (tmsize_t) -1;
	}
	return ((tmsize_t) write((int) fd, buf, size_io));
}

static uint64
_tiffSeekProc(thandle_t fd, uint64 off, int whence)
{
	off_t off_io = (off_t) off;
	if ((uint64) off_io != off)
	{
		errno=EINVAL;
		return (uint64) -1; /* this is really gross */
	}
	return((uint64)lseek((int)fd,off_io,whence));
}

static int
_tiffCloseProc(thandle_t fd)
{
	return(close((int)fd));
}

static uint64
_tiffSizeProc(thandle_t fd)
{
	struct stat sb;
	if (fstat((int)fd,&sb)<0)
		return(0);
	else
		return((uint64)sb.st_size);
}

#ifdef HAVE_MMAP
#include <sys/mman.h>

static int
_tiffMapProc(thandle_t fd, void** pbase, toff_t* psize)
{
	uint64 size64 = _tiffSizeProc(fd);
	tmsize_t sizem = (tmsize_t)size64;
	if ((uint64)sizem==size64) {
		*pbase = (void*)
		    mmap(0, (size_t)sizem, PROT_READ, MAP_SHARED, (int) fd, 0);
		if (*pbase != (void*) -1) {
			*psize = (tmsize_t)sizem;
			return (1);
		}
	}
	return (0);
}

static void
_tiffUnmapProc(thandle_t fd, void* base, toff_t size)
{
	(void) fd;
	(void) munmap(base, (off_t) size);
}
#else /* !HAVE_MMAP */
static int
_tiffMapProc(thandle_t fd, void** pbase, toff_t* psize)
{
	(void) fd; (void) pbase; (void) psize;
	return (0);
}

static void
_tiffUnmapProc(thandle_t fd, void* base, toff_t size)
{
	(void) fd; (void) base; (void) size;
}
#endif /* !HAVE_MMAP */

/*
 * Open a TIFF file descriptor for read/writing.
 */
TIFF*
TIFFFdOpen(int fd, const char* name, const char* mode)
{
	TIFF* tif;

	tif = TIFFClientOpen(name, mode,
	    (thandle_t) fd,
	    _tiffReadProc, _tiffWriteProc,
	    _tiffSeekProc, _tiffCloseProc, _tiffSizeProc,
	    _tiffMapProc, _tiffUnmapProc);
	if (tif)
		tif->tif_fd = fd;