home *** CD-ROM | disk | FTP | other *** search
- #ifndef lint
- static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_vms.c,v 1.9 93/08/25 09:35:01 sam Exp $";
- #endif
-
- /*
- * Copyright (c) 1988, 1989, 1990, 1991, 1992 Sam Leffler
- * Copyright (c) 1991, 1992 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
- /*
- * TIFF Library VMS-specific Routines.
- */
- #include "tiffiop.h"
-
- static tsize_t
- _tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size)
- {
- return (read((int) fd, buf, size));
- }
-
- static tsize_t
- _tiffWriteProc(thandle_t fd, tdata_t buf, u_long size)
- {
- return (write((int) fd, buf, size));
- }
-
- static toff_t
- _tiffSeekProc(thandle_t fd, toff_t off, int whence)
- {
- return ((toff_t) lseek((int) fd, (off_t) off, whence));
- }
-
- static int
- _tiffCloseProc(thandle_t fd)
- {
- return (close((int) fd));
- }
-
- #include <sys/stat.h>
-
- static toff_t
- _tiffSizeProc(thandle_t fd)
- {
- struct stat sb;
- return (toff_t) (fstat((int) fd, &sb) < 0 ? 0 : sb.st_size);
- }
-
- #ifdef MMAP_SUPPORT
- #include <fab.h>
- #include <secdef.h>
-
- /*
- * Table for storing information on current open sections.
- * (Should really be a linked list)
- */
- #define MAX_MAPPED 100
- static int no_mapped = 0;
- static struct {
- char *base;
- char *top;
- unsigned short channel;
- } map_table[MAX_MAPPED];
-
- /*
- * This routine maps a file into a private section. Note that this
- * method of accessing a file is by far the fastest under VMS.
- * The routine may fail (i.e. return 0) for several reasons, for
- * example:
- * - There is no more room for storing the info on sections.
- * - The process is out of open file quota, channels, ...
- * - fd does not describe an opened file.
- * - The file is already opened for write access by this process
- * or another process
- * - There is no free "hole" in virtual memory that fits the
- * size of the file
- */
- static int
- _tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
- {
- char name[256];
- struct FAB fab;
- unsigned short channel;
- char *inadr[2], *retadr[2];
- unsigned long status;
- long size;
-
- if (no_mapped >= MAX_MAPPED)
- return(0);
- /*
- * We cannot use a file descriptor, we
- * must open the file once more.
- */
- if (getname(fd, name, 1) == NULL)
- return(0);
- /* prepare the FAB for a user file open */
- fab = cc$rms_fab;
- fab.fab$v_ufo = 1;
- fab.fab$b_fac = FAB$M_GET;
- fab.fab$b_shr = FAB$M_SHRGET;
- fab.fab$l_fna = name;
- fab.fab$b_fns = strlen(name);
- status = sys$open(&fab); /* open file & get channel number */
- if ((status&1) == 0)
- return(0);
- channel = (unsigned short)fab.fab$l_stv;
- inadr[0] = inadr[1] = (char *)0; /* just an address in P0 space */
- /*
- * Map the blocks of the file up to
- * the EOF block into virtual memory.
- */
- size = _tiffSizeProc(fd);
- status = sys$crmpsc(inadr, retadr, 0, SEC$M_EXPREG, 0,0,0, channel,
- howmany(size,512), 0,0,0);
- if ((status&1) == 0){
- sys$dassgn(channel);
- return(0);
- }
- *pbase = (tdata_t) retadr[0]; /* starting virtual address */
- /*
- * Use the size of the file up to the
- * EOF mark for UNIX compatibility.
- */
- *psize = (toff_t) size;
- /* Record the section in the table */
- map_table[no_mapped].base = retadr[0];
- map_table[no_mapped].top = retadr[1];
- map_table[no_mapped].channel = channel;
- no_mapped++;
-
- return(1);
- }
-
- /*
- * This routine unmaps a section from the virtual address space of
- * the process, but only if the base was the one returned from a
- * call to TIFFMapFileContents.
- */
- static void
- _tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size)
- {
- char *inadr[2];
- int i, j;
-
- /* Find the section in the table */
- for (i = 0;i < no_mapped; i++) {
- if (map_table[i].base == (char *) base) {
- /* Unmap the section */
- inadr[0] = (char *) base;
- inadr[1] = map_table[i].top;
- sys$deltva(inadr, 0, 0);
- sys$dassgn(map_table[i].channel);
- /* Remove this section from the list */
- for (j = i+1; j < no_mapped; j++)
- map_table[j-1] = map_table[j];
- no_mapped--;
- return;
- }
- }
- }
- #else /* !MMAP_SUPPORT */
- static int
- _tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
- {
- return (0);
- }
-
- static void
- _tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size)
- {
- }
- #endif /* !MMAP_SUPPORT */
-
- /*
- * 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;
- return (tif);
- }
-
- /*
- * Open a TIFF file for read/writing.
- */
- TIFF*
- TIFFOpen(const char* name, const char* mode)
- {
- static const char module[] = "TIFFOpen";
- int m, fd;
-
- m = _TIFFgetMode(mode, module);
- if (m == -1)
- return ((TIFF*)0);
- if (m&O_TRUNC){
- /*
- * There is a bug in open in VAXC. If you use
- * open w/ m=O_RDWR|O_CREAT|O_TRUNC the
- * wrong thing happens. On the other hand
- * creat does the right thing.
- */
- fd = creat(name, 0666,
- "alq = 128", "deq = 64", "mbc = 32",
- "fop = tef", "ctx = stm");
- } else if (m&O_RDWR) {
- fd = open(name, m, 0666,
- "deq = 64", "mbc = 32", "fop = tef", "ctx = stm");
- } else
- fd = open(name, m, 0666, "mbc = 32");
- if (fd < 0) {
- TIFFError(module, "%s: Cannot open", name);
- return ((TIFF*)0);
- }
- return (TIFFFdOpen(fd, name, mode));
- }
-
- void*
- _TIFFmalloc(size_t s)
- {
- return (malloc(s));
- }
-
- void
- _TIFFfree(void* p)
- {
- free(p);
- }
-
- void*
- _TIFFrealloc(void* p, size_t s)
- {
- return (realloc(p, s));
- }
-