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CMakeLists.txt	3.35 KB	-rw-r--r--	2022-02-19 15:33
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TIFFClose.3tiff.html	2.15 KB	-rw-r--r--	2026-07-21 15:53
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TIFFFlush.3tiff.html	2.83 KB	-rw-r--r--	2026-07-21 15:53
TIFFGetField.3tiff.html	32.86 KB	-rw-r--r--	2026-07-21 15:53
TIFFOpen.3tiff.html	14.43 KB	-rw-r--r--	2026-07-21 15:53
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TIFFWarning.3tiff.html	3.06 KB	-rw-r--r--	2026-07-21 15:53
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TIFFquery.3tiff.html	4.98 KB	-rw-r--r--	2026-07-21 15:53
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index.html	3.74 KB	-rw-r--r--	2022-02-19 15:33
libtiff.3tiff.html	54.34 KB	-rw-r--r--	2026-07-21 15:53
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Rename

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
 p { margin-top: 0; margin-bottom: 0; vertical-align: top }
 pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
 table { margin-top: 0; margin-bottom: 0; vertical-align: top }
 h1 { text-align: center }
</style>
<title>TIFFOPENOPTIONS</title>

</head>
<body>

<h1 align="center">TIFFOPENOPTIONS</h1>

<a href="#NAME">NAME</a> 
<a href="#SYNOPSIS">SYNOPSIS</a> 
<a href="#DESCRIPTION">DESCRIPTION</a> 
<a href="#EXAMPLE">EXAMPLE</a> 
<a href="#NOTE">NOTE</a> 
<a href="#SEE ALSO">SEE ALSO</a> 
<a href="#AUTHOR">AUTHOR</a> 
<a href="#COPYRIGHT">COPYRIGHT</a>

<hr>

TIFFOpenOptions
&minus; open a TIFF file for reading or writing

<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>

<pre style="margin-left:15%; margin-top: 1em">#include &lt;tiffio.h&gt;</pre>

typedef
TIFFOpenOptions TIFFOpenOptions 
TIFFOpenOptions *TIFFOpenOptionsAlloc(void) 
void TIFFOpenOptionsFree(TIFFOpenOptions*)
 
void
TIFFOpenOptionsSetMaxSingleMemAlloc(TIFFOpenOptions
*opts, 
tmsize_t max_single_mem_alloc) 
void
TIFFOpenOptionsSetMaxCumulatedMemAlloc(TIFFOpenOptions
*opts, 
tmsize_t max_cumulated_mem_alloc) 
void
TIFFOpenOptionsSetErrorHandlerExtR(TIFFOpenOptions
*opts, - 
TIFFErrorHandlerExtR handler, void
*errorhandler_user_data) 
void
TIFFOpenOptionsSetWarningHandlerExtR(TIFFOpenOptions
*opts, - 
TIFFErrorHandlerExtR handler, void
*warnhandler_user_data) 
void
TIFFOpenOptionsSetWarnAboutUnknownTags(TIFFOpenOptions
*opts, int 
warn_about_unknown_tags)

<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>

TIFFOpenOptions
is an opaque structure which can be passed to the TIFF
open&quot;Ext&quot; functions to define some libtiff
internal settings. The settings are the maximum single
memory allocation limit and per&minus;TIFF handle
(re&minus;entrant) error handler and warning handler
functions. For those handler a pointer to a custom
defined data structure user_data can be given
along.

TIFFOpenOptionsAlloc()
allocates memory for the TIFFOpenOptions opaque
structure and returns a TIFFOpenOptions pointer.

TIFFOpenOptionsFree()
releases the allocated memory for TIFFOpenOptions.
The allocated memory for TIFFOpenOptions can be
released straight after successful execution of the related
TIFFOpen&quot;Ext&quot; functions like
TIFFOpenExt().

TIFFOpenOptionsSetMaxSingleMemAlloc()
(added in libtiff 4.5.0) sets the value for the maximum
single memory limit in byte that libtiff internal
memory allocation functions are allowed to request per
call.

NOTE:

However, the libtiff
external functions _TIFFmalloc() and -
_TIFFrealloc() do not apply this internal
memory allocation limit set by
TIFFOpenOptionsSetMaxSingleMemAlloc()!

TIFFOpenOptionsSetMaxCumulatedMemAlloc()
(added in libtiff 4.6.1) sets the maximum cumulated memory
allocations in byte, for a given TIFF handle, that
libtiff internal memory allocation functions are
allowed.

NOTE:

TIFFOpenOptionsSetErrorHandlerExtR()
sets the function pointer to an application&minus;specific
and per&minus;TIFF handle (re&minus;entrant) error handler.
Furthermore, a pointer to a custom defined data
structure errorhandler_user_data can be passed.
This error handler is invoked through TIFFErrorExtR()
and the errorhandler_user_data pointer is given
along. The errorhandler_user_data argument may be
NULL.

TIFFOpenOptionsSetWarningHandlerExtR()
works like TIFFOpenOptionsSetErrorHandlerExtR() but
for the warning handler, which is invoked through
TIFFWarningExtR()

TIFFOpenOptionsSetWarnAboutUnknownTags()
sets whether libtiff should emit a warning when encountering
a unknown tag. This function has been added in libtiff 4.7.1
and the default value is FALSE (change of behaviour compared
to earlier versions).

<h2>EXAMPLE
<a name="EXAMPLE"></a>
</h2>

<pre style="margin-left:15%; margin-top: 1em">#include &quot;tiffio.h&quot;

typedef struct MyErrorHandlerUserDataStruct
{
    /* ... any user data structure ... */
} MyErrorHandlerUserDataStruct;

static int myErrorHandler(TIFF *tiff, void *user_data, const char *module,
                      const char *fmt, va_list ap)
{
    MyErrorHandlerUserDataStruct *errorhandler_user_data =
        (MyErrorHandlerUserDataStruct *)user_data;
    /*... code of myErrorHandler ...*/
    return 1;
}

main()
{
    tmsize_t limit = (256 * 1024 * 1024);
    MyErrorHandlerUserDataStruct user_data = { /* ... any data ... */};

TIFFOpenOptions *opts = TIFFOpenOptionsAlloc();
    TIFFOpenOptionsSetMaxSingleMemAlloc(opts, limit);
    TIFFOpenOptionsSetErrorHandlerExtR(opts, myErrorHandler, &amp;user_data);
    TIFF *tif = TIFFOpenExt(&quot;foo.tif&quot;, &quot;r&quot;, opts);
    TIFFOpenOptionsFree(opts);
    /* ... go on here ... */

TIFFClose(tif);
}</pre>

This
functionality was introduced with libtiff 4.5.

libtiff
(3tiff), TIFFOpen (3tiff), TIFFError (3tiff),
TIFFWarning (3tiff)

<h2>AUTHOR
<a name="AUTHOR"></a>
</h2>

LibTIFF
contributors

<h2>COPYRIGHT
<a name="COPYRIGHT"></a>
</h2>

1988-2025,
LibTIFF contributors
<hr>
</body>
</html>