changelog

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1.00 released on Tue 30 Mar 1993
	shorten.h changed to allow ANSI prototypes
	insertion of Steve Lowes fixes for PC compatibility
	Inclusion of the file laplacian.tex
	Typo in man page fixed (hl -> lh)
1.01 released on Tue 06 Apr 1993
	Inclusion of the file change.log
	Documentation of the default byte order
	Setjmp() moved so as to only be used in embedded applications
	Bug in casting to long in word_get() fixed
1.02 released on Thu 08 Apr 1993
	sizech.c removed in line with allowing sizeof(int) == 2
	variable nsd in vario.c:uvar_put() changed to unsigned long
	variable uvar in vario.c:var_get() changed to unsigned long
	constant 1 changed to 1L in vario.c:var_put()
	log(0.0) avoided in lpc.c for pathological cases
	check inserted for predictor order being less than the block size
	if NEED_TO_GUARANTEE_LPC_STABILITY is defined, it will do just that
1.03 released on Mon 12 Apr 1993
	resetopt() added to getopt.c and called before getopt() in shorten.c
	tables in bitshift.h changed from int to char to reduce executable size
	option -d added to discard header bytes on compression/decompression
	wav2lpc() fixed so that the returned value "resn" is non-negative
1.04 released on Fri 07 May 1993
	check added to ensure that the lpc order is less than the buffersize
1.05 released on Sat 08 May 1993
	option -d fixed to work with pipe input and discard on decompression
	bitshift.h removed from the distribution to reduce the size
	types uchar and schar typedef'ed in shorten.h and used in bitshift.h
1.06 released on Tue 11 May 1993
	try to preserve the mode, owner, group, atime and mtime of UNIX files
	input file in unlinked if output file was written successfully
	array.c created to contan pmalloc() and long2d() which error check
1.07 released on Thu 13 May 1993
	added the file INSTALL to give installation instructions
	fixed a few function declarations that were missing
	internal movement within shorten.c in prepration for lossy coding
	changed test file to be real speech
	change from shar to tar.Z format for distribution
	new typdefs ulong and ushort for the obvious things
	pmalloc and long2d now take arguments of type ulong
1.08 released on Fri 18 Jun 1993
	better function prototyping (gcc style) in shorten.h
	uchar ushort ulong now #defined to avoid warnings if typedef exists
1.09 released on Thu 01 Jul 1993
	provisional implementation of -q and -r flags - not finalised
	getc_exit and putc_exit macros used in shorten.c
	-a for version 2 now copies verbatim (checking for the magic number)
	various changes and additions to sphere.c from Jon Fiscus
	getopt functions/variables have hs_ prepended to avoid system conflict
	dupfileinfo.c renamed to be dupfinfo.c - less than eight characters
	memory allocation in fixio.c and vario.c tied up for embedded use
1.10 released on Mon 04 Oct 1993
	updated man page for -q and -r
	exit routines now use varargs and are less verbose
	bitshift now prints longs to bitshift.h as %ld
	shn109.exe included for the first time
1.11 released on Mon 08 Nov 1993
	hsgetopt.h deleted - obsoleted by correct definitions in shorten.h
	division by zero for null input avoided in lpc.c
1.12 released on Wed 23 Feb 1994
	out by one bug in lpc.c internal array sizes fixed (-p 64 now works)
	magic and version (0 ... 7) numbers merged for SPHERE header parsing
	decompression starts when the magic number is found
	option -a now allows for alignment prior to during decoding
1.13 released on Mon 11 Apr 1994
	dupfinfo.c - utime() now called before chmod() and chown()
	prototpye for malloc changed to unsigned long
	readme.dos created for DOS specific problems
	support for stdargs added if HAVE_STDARG_H defined on compilation
	exit.c - fprintf(stderr, ": "); perror(NULL) changed to perror("\0")
	main.c - DOS pipe output hacked by opening fd 1 "wb" with no buffer
	fixio.c - optimisation test for nchan == 0 changed to nchan == 1
	shorten.c - changed abs() for labs() as arguements are long, not int
	lots of non-functional disambiguation to keep DOS compilation quiet
	bitshift.c renamed to mkbshift.c and bitshift.h hardwired in for DOS
	shorten.exe included in the distribution
	releases now made with mkrelease, *.tar.Z, *.tar.gz. *.zip
1.14 released on Mon 08 Aug 1994
	ulaw files are now lossy coded by internally converting to linear
	better treatment of LPC quantisation errors from version 2
	slightly better -h screen
	default nmean is 4 as from version 2
	fixed stupid bug that corrupted the zip version of shorten.exe
1.15 released on Wed 24 Aug 1994
	ICASSP94 support code deleted
	lpc.c: now pass non-zero mean signal and offset
	shorten.c: massive internal reorganisation of compression section
	shorten.c: reasonable mean correction when in lossy mode from V 2.0
1.16 released on Mon 29 Aug 1994
	stdlib.h and string.h now assumed to exist
	lpc.c: fix bug which malloced too few bytes (introduced in 1.16)
1.17 released on Wed 31 Aug 1994
1.18 released on Sat 03 Sep 1994 (by mistake)
	lossy compression to a given segmental SNR is now supported (-n)
	man page rewritten and updated to support lossy compression
	the au file type option is has been renamed ulaw (au is still valid)
	filetimes on the DOS release now match those on the UNIX release
	v2: maximum lpc order searched is the best previous value plus two
	PC compilation moved from XT/tcc to 486/gcc and Makefile.dos deleted
1.19 released on Mon 03 Oct 1994
	spurious labs() in poly.c swapped for abs
	change all #ifdef unix for #ifndef MSDOS as djgpp #defs unix
1.20 released on Mon 17 Oct 1994
	bcc supported again as the executable is smaller (so labs() is back)
1.21 released on Mon 14 Nov 1994
	option -l implemented to print the contents of the LICENSE file
	technical report 156 added as files tr156.tex and tr156.ps
	man page updated
	support added for the WATCOM compiler from [e-mail]
	mkrelease and Change.log renamed to release and change.log
	shorten.c: very minor change in lossy coding with -n (2.0 -> 25.0/12.0)
	MSDOS stdin/stdout binary mode fiddling moved from main.c to shorten.c
	linear2ulaw(int) changed to linear2ulaw(long)
	old XT compatable executable renamed shorten.086
1.22 released on Tue 10 Jan 1995
	shorten.c: bug with FN_ZERO fixed - no longer look for more bitshifts
	exit.c: basic_exit() - delete output file if abnormal termination
	shorten.1: warn about lossy coding of unsigned data with offset
	shorten.c: new flag, -u, maps both ulaw zeros onto the positive zero
	v2: new type for lossless ulaw, TYPE_AU2, for two zero ulaw data
1.23 released on Fri 14 Jul 1995
	minor documenation changes
2.0  released on Sun 27 Aug 1995
	lpc.c: round quantised coefficents to the nearest integer
	*.c: numerous casts to avoid warnings with Visual C/C++
	shorten.1: changed format of bit table
	ulaw.c: replaced with Sulawalaw.c
	alaw support: much like ulaw except no zero merge or fancy bitshift()
	shorten.c: help screen left shifted by six chars to accomodate "alaw,"
	Limited WINDOWS support added
	slight optimisation when frame is all zero (don't change bitshift)
	shorten.c: bug fixed when FN_QLPC called after FN_ZERO
	fixio.c:signed values close to max were converted to min when quantised
	BUGFIX_RELEASE definition moved from Makefile to shorten.h
	old ANNOUNCE file deleted and minor changes to INSTALL
	shorten.mak:  Default DOS compiler changed from BCC to MS Visual C++
	Makefile/release:  now take BUGFIX_RELEASE from shorten.h
	Makefile: no longer delete bitshift.h on clean/spotless
2.1  released on Mon 26 Feb 1996
	lpc.c: a bug disabled the early stopping on the search for LP order
	shorten.c: silly bug in ordering of arguments in a rare printf()
	shorten.c: redundant variable/storage buffer1 removed
	shorten.1: Document bugs in the tech report on Rice coding
	-t is now honoured (where possible) to convert file types on decode
	Makefile updated to be more package friendly (James Christie)
2.2  released on Mon 10 Mar 1997
        New -t option "wav" for RIFF WAVE files (automatic selection of -t)
	-t wav now the default - man page and shntest updated, mvs_s16 renamed
	script release renamed mkRelease to avoid MS VC++ name conflict
	setjump() bugfixes for embedded operation (Martin Saxon)
	New windows DLL operation (Martin Saxon)
2.3  released on Thu 04 Sep 1997
	exit.c: system dependence on *sys_errlist[] changed to strerror()
	SHORTEN.086, SHORTEN.EXE and shortn32.exe removed
	Some Debian support
2.3a released on Fri 26 Feb 1999	
3.0  released on Fri 29 Sep 2000
	Seek table extensions by Wayne Stielau
	Unix backport of seek table extensions by Jason Jordan
	Debian support improvements by Caleb Epstein
3.1  released on Tue 10 Oct 2000
	Seek table append option 'fixed'
	Documentation updated
3.2  released on Sat 13 Jan 2001
	Added '-i' switch to display whether a file contains seek information
	Cleaned up endian-conversion code
	Fixed a file naming bug - now, when only an input file name is given,
	output files are named according to the following rules:

		If shortening a file:

			If the input file name ends in .wav, then change
			extension to .shn; otherwise, append .shn to the
			input file name.  Examples:

				file.wav  ->  file.shn
				file.ext  ->  file.ext.shn

		If extracting a file:

			If the input file name ends in .shn, then change
			extension to .wav; otherwise, append .wav to the
			input file name.

				file.shn  ->  file.wav
				file.ext  ->  file.ext.wav

	When the caller specifies -v2 on the command line, seek tables are
	not generated (neither appended nor created in separate files).
	The default behavior is to generate/append seek tables.
3.3  released on Sun 12 Aug 2001
	Converted to autoconf/automake build system
	Made seek table code 64-bit clean
	Changed seek table data structures to compensate for compilers that don't
	  properly implement #pragma pack(1)
	Various minor cleanups/updates that don't impact the shorten algorithm
3.4  released on Sun 10 Feb 2002
	Fix for reading/writing binary data on stdin/stdout for operating systems
	  that do not have a single '\x0A' as a line separator (Frank Klemm)
	Shorten now refuses to input data from or output data to a tty
	Fixed crash when trying to create seek tables from a non-shorten file
	-s and -S options can now create seek table files from data read on stdin
	  (with -s, output filename is 'stdin.skt')
	Seek tables are now appended to non-stdout output file when reading
	  uncompressed data from stdin (e.g. shorten - outfile.shn < data.wav)
3.5.0  released on Mon 18 Nov 2002
	Support for compression of AIFF files contributed by Brian Willoughby of
	  Sound Consulting
	Changed file naming convention during extraction - when only an input file
	  name is given, output files are named according to the following rules:

			If the input file name contains more than one '.' and
			ends in .shn, then drop the .shn; otherwise, if the input
			file name ends in .shn, then change the extension to .wav;
			otherwise, append .wav to the input file name.

				file.aiff.shn  ->  file.aiff
				file.aiff.ext  ->  file.aiff.ext.wav
				file.shn       ->  file.wav
				file.ext       ->  file.ext.wav

	  This change was made so that non-wav files would be properly named after
	  shortening and unshortening.  For example, 'shorten file.aiff' creates
	  file.aiff.shn, and with the change above, 'shorten -x file.aiff.shn'
	  will now create file.aiff (instead of file.aiff.wav).
3.5.1  released Wed 12 Feb 2003
	Minor AIFF spec compliance updates