[MPlayer-dev-eng] [PATCH] Writing index in avi files > 2GB

[Steven M. Schultz]

On Tue, 11 Nov 2003, Attila Kinali wrote:

> On Tue, 11 Nov 2003 21:12:14 +0100
> Boris Schaefer <mplayer at noid-project.de> wrote:
> 
> > This patch contains a few changes (ftell -> ftello) to write the
> > avi-index in files > 2GB (but < 4GB) correctly.
> 
> I think this is save to apply, any objections ?

	No objection but ftello/fseeko need to be tested for at
	./configure time and compatibility code used if the routine(s)
	are not found.   osdep/ would be the logical place I believe.

	I've attached a version of the code used by several projects
	(libquicktime, Postgresql are two I know of).  The prototypes
	can go where convenient.

	Steven Schultz
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#ifndef	HAVE_FSEEKO

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

/*
 *	On BSD/OS and NetBSD, off_t and fpos_t are the same.  Standards
 *	say off_t is an arithmetic type, but not necessarily integral,
 *	while fpos_t might be neither.
 */

int
fseeko(FILE *stream, off_t offset, int whence)
{
	off_t floc;
	struct stat filestat;

	switch (whence)
	{
		case SEEK_CUR:
			flockfile(stream);
			if (fgetpos(stream, &floc) != 0)
				goto failure;
			floc += offset;
			if (fsetpos(stream, &floc) != 0)
				goto failure;
			funlockfile(stream);
			return 0;
			break;
		case SEEK_SET:
			if (fsetpos(stream, &offset) != 0)
				return -1;
			return 0;
			break;
		case SEEK_END:
			flockfile(stream);
			if (fstat(fileno(stream), &filestat) != 0)
				goto failure;
			floc = filestat.st_size;
			if (fsetpos(stream, &floc) != 0)
				goto failure;
			funlockfile(stream);
			return 0;
			break;
		default:
			errno =	EINVAL;
			return -1;
	}

failure:
	funlockfile(stream);
	return -1;
}

off_t
fseeko64(FILE *stream, off_t offset, int whence)
{
	return(fseeko(stream, offset, whence));
}

off_t
ftello(FILE *stream)
{
	off_t floc;

	if (fgetpos(stream, &floc) != 0)
		return -1;
	return floc;
}

off_t
ftello64(FILE *stream)
{
	return(ftello(stream));
}
#endif