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#ifndef lint
static char rcsid[] = "/mode/users/src/master/tiff/libtiff/tif_compat.c,v 1.3 1994/06/29 17:20:41 fedor 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 Compatibility Routines.
*/
#include "tiffioP.h"
#ifdef STREAM_SUPPORT
long
TIFFGetFileSize(fd)
int fd;
{
int pos, len;
/* Ugly way to find the size of a file/stream */
pos = TFTell((TFStream *)fd);
if (pos < 0)
return 0;
TFSeek((TFStream *)fd, 0, TF_FROMEND);
len = TFTell((TFStream *)fd);
TFSeek((TFStream *)fd, pos, TF_FROMSTART);
return (len > 0) ? len : 0;
}
#elif defined(unix) || defined(__unix) || defined(MSDOS) || defined(VMS)
#include <sys/stat.h>
long
TIFFGetFileSize(fd)
int fd;
{
struct stat sb;
return (fstat(fd, &sb) < 0 ? 0 : sb.st_size);
}
#endif
#ifdef STREAM_SUPPORT
int
TIFFMapFileContents(fd, pbase, psize)
int fd;
char **pbase;
long *psize;
{
int maxsize;
/* We're already mapped -- just get the address and size */
TFGetMemoryBuffer((TFStream *)fd, pbase, psize, &maxsize);
return (0);
}
void
TIFFUnmapFileContents(base, size)
char *base;
long size;
{
/* This is done on a close (tif_close) via TFCloseMemory after
the file is saved.
*/
}
#elif (defined(unix) || defined(__unix)) && defined(MMAP_SUPPORT)
#include <sys/mman.h>
int
TIFFMapFileContents(fd, pbase, psize)
int fd;
char **pbase;
long *psize;
{
long size = TIFFGetFileSize(fd);
if (size != -1) {
*pbase = (char *) mmap(0, size, PROT_READ, MAP_SHARED, fd, 0);
if (*pbase != (char *)-1) {
*psize = size;
return (1);
}
}
return (0);
}
void
TIFFUnmapFileContents(base, size)
char *base;
long size;
{
(void) munmap(base, size);
}
#endif /* (defined(unix) || defined(__unix)) && defined(MMAP_SUPPORT) */
#if defined(VMS) && defined(MMAP_SUPPORT)
#include <fab.h>
#include <secdef.h>
/*
* Table for storing information on current open sections.
* (You may want to substitute a linked list...)
*/
#define MAX_MAPPED 100
static int no_mapped = 0;
static struct {
void *base;
void *top;
unsigned 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
*/
int
TIFFMapFileContents(fd, pbase, psize)
int fd;
char **pbase;
long *psize;
{
char name[256];
struct FAB fab;
unsigned short channel;
void *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] = &channel; /* just an address in P0 space */
/*
* Map the blocks of the file up to
* the EOF block into virtual memory.
*/
size = TIFFGetFileSize(fd);
status = sys$crmpsc(inadr, retadr, 0, SEC$M_EXPREG, 0,0,0, channel,
howmany(size,512), 0,0,0);
if ((status&1) == 0)
return(0);
*pbase = retadr[0]; /* starting virtual address */
/*
* Use the size of the file up to the
* EOF mark for UNIX compatibility.
*/
*psize = 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.
*/
void
TIFFUnmapFileContents(base, size)
char *base;
long size;
{
void *inadr[2];
int i, j;
/* Find the section in the table */
for (i = 0;i < no_mapped; i++) {
if (map_table[i].base == base) {
/* Unmap the section */
inadr[1] = base;
inadr[0] = 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;
}
}
}
#endif /* defined(VMS) && defined(MMAP_SUPPORT) */
#if defined(THINK_C) || defined(applec)
long
TIFFGetFileSize(int fd)
{
long pos, eof;
pos = lseek(fd, 0, SEEK_CUR);
eof = lseek(fd, 0, SEEK_END);
lseek(fd, pos, SEEK_SET);
return(eof);
}
#endif /* THINK_C || applec */
#if defined(applec)
#include <ioctl.h>
#include <Files.h>
#undef lseek
long
mpw_lseek(int fd, long offset, int whence)
{
long filepos, filesize, newpos;
short macfd;
if ((filepos = lseek(fd, 0, SEEK_CUR)) < 0 ||
(filesize = lseek(fd, 0, SEEK_END)) < 0)
return (EOF);
newpos = offset + (whence == SEEK_SET ? 0 :
whence == SEEK_CUR ? filepos :
filesize);
if (newpos > filesize)
if (ioctl(fd, FIOREFNUM, &macfd) == -1 ||
SetEOF(macfd, newpos) != 0)
return (EOF);
return (lseek(fd, newpos, SEEK_SET));
}
#endif /* applec */
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