Adding upstream version 1.5.upstream/1.5

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

20 files changed, 632 insertions, 272 deletions

diff --git a/ChangeLog b/ChangeLog
index 47c95c1..3877eb6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2016-05-14  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.5 released.
+	* main.cc: Added new option '-a, --trailing-error'.
+	* main.cc (main): Delete '--output' file if infd is a terminal.
+	* main.cc (main): Don't use stdin more than once.
+	* lzip.texi: Added chapters 'Trailing data' and 'Examples'.
+	* configure: Avoid warning on some shells when testing for g++.
+	* Makefile.in: Detect the existence of install-info.
+	* testsuite/check.sh: A POSIX shell is required to run the tests.
+	* testsuite/check.sh: Don't check error messages.
+
 2015-07-09  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.4 released.
@@ -6,11 +18,11 @@
 2015-01-22  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.3 released.
-	* dec_stream.cc: Do not use output packets or muxer when testing.
+	* dec_stream.cc: Don't use output packets or muxer when testing.
 	* Make '-dvvv' and '-tvvv' show dictionary size like lzip.
 	* lzip.h: Added missing 'const' to the declaration of 'compress'.
-	* Added chapters 'Memory requirements' and 'Minimum file sizes'
-	  to manual.
+	* lzip.texi: Added chapters 'Memory requirements' and
+	  'Minimum file sizes'.
 	* Makefile.in: Added new targets 'install*-compress'.
 
 2014-08-29  Antonio Diaz Diaz  <antonio@gnu.org>
@@ -27,7 +39,7 @@
 
 	* Version 1.1 released.
 	* Show progress of compression at verbosity level 2 (-vv).
-	* SIGUSR1 and SIGUSR2 are no more used to signal a fatal error.
+	* SIGUSR1 and SIGUSR2 are no longer used to signal a fatal error.
 
 2013-05-29  Antonio Diaz Diaz  <antonio@gnu.org>
 
@@ -69,7 +81,7 @@
 	  to match those of lzip 1.11.
 	* decompress.cc: A limit has been set on the number of packets
 	  produced by workers to limit the amount of memory used.
-	* main.cc (open_instream): Do not show the message
+	* main.cc (open_instream): Don't show the message
 	  " and '--stdout' was not specified" for directories, etc.
 	* main.cc: Fixed warning about fchown return value being ignored.
 	* testsuite: 'test1' renamed to 'test.txt'. Added new tests.
@@ -78,8 +90,8 @@
 
 	* Version 0.6 released.
 	* Small portability fixes.
-	* Added chapter 'Program Design' and description of option
-	  '--threads' to manual.
+	* lzip.texinfo: Added chapter 'Program Design' and description
+	  of option '--threads'.
 	* Debug stats have been fixed.
 
 2010-02-10  Antonio Diaz Diaz  <ant_diaz@teleline.es>
@@ -127,7 +139,7 @@
             until something better appears on the net.
 
 
-Copyright (C) 2009-2015 Antonio Diaz Diaz.
+Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
 This file is a collection of facts, and thus it is not copyrightable,
 but just in case, you have unlimited permission to copy, distribute and
diff --git a/INSTALL b/INSTALL
index 5969bdc..dd302d9 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,7 +1,7 @@
 Requirements
 ------------
 You will need a C++ compiler and the lzlib compression library installed.
-I use gcc 4.9.1 and 4.1.2, but the code should compile with any
+I use gcc 5.3.0 and 4.1.2, but the code should compile with any
 standards compliant compiler.
 Lzlib must be version 1.0 or newer, but the fast encoder is only
 available in lzlib 1.7 or newer.
@@ -65,7 +65,7 @@ After running 'configure', you can run 'make' and 'make install' as
 explained above.
 
 
-Copyright (C) 2009-2015 Antonio Diaz Diaz.
+Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute and modify it.
diff --git a/Makefile.in b/Makefile.in
index 1652cb6..8f07828 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -6,6 +6,7 @@ INSTALL_DATA = $(INSTALL) -m 644
 INSTALL_DIR = $(INSTALL) -d -m 755
 LIBS = -llz -lpthread
 SHELL = /bin/sh
+CAN_RUN_INSTALLINFO = $(SHELL) -c "install-info --version" > /dev/null 2>&1
 
 objs = arg_parser.o file_index.o compress.o dec_stdout.o dec_stream.o \
        decompress.o main.o
@@ -72,7 +73,9 @@ install-info :
 	if [ ! -d "$(DESTDIR)$(infodir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(infodir)" ; fi
 	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 	$(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info "$(DESTDIR)$(infodir)/$(pkgname).info"
-	-install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info"
+	-if $(CAN_RUN_INSTALLINFO) ; then \
+		install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	fi
 
 install-info-compress : install-info
 	lzip -v -9 "$(DESTDIR)$(infodir)/$(pkgname).info"
@@ -95,7 +98,9 @@ uninstall-bin :
 	-rm -f "$(DESTDIR)$(bindir)/$(progname)"
 
 uninstall-info :
-	-install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info"
+	-if $(CAN_RUN_INSTALLINFO) ; then \
+		install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	fi
 	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 
 uninstall-man :
diff --git a/NEWS b/NEWS
index 770d0a8..0b0220c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,14 @@
-Changes in version 1.4:
+Changes in version 1.5:
 
-The option "-0" has been modified to use the new fast encoder of lzlib
-1.7, which achieves a compression speed and ratio comparable to those of
-pigz's default compression level.
+The option "-a, --trailing-error", which makes plzip exit with error
+status 2 if any remaining input is detected after decompressing the last
+member, has been added.
+
+When decompressing, the file specified with the '--output' option is now
+deleted if the input is a terminal.
+
+The new chapters "Trailing data" and "Examples" have been added to the
+manual.
+
+A harmless check failure on Windows, caused by the failed comparison of
+a message in text mode, has been fixed.
diff --git a/README b/README
index a6cc369..6478ced 100644
--- a/README
+++ b/README
@@ -13,7 +13,7 @@ plzip is no faster than lzip.
 
 When compressing, plzip divides the input file into chunks and
 compresses as many chunks simultaneously as worker threads are chosen,
-creating a multi-member compressed file.
+creating a multimember compressed file.
 
 When decompressing, plzip decompresses as many members simultaneously as
 worker threads are chosen. Files that were compressed with lzip will not
@@ -88,7 +88,7 @@ corresponding uncompressed files. Integrity testing of concatenated
 compressed files is also supported.
 
 
-Copyright (C) 2009-2015 Antonio Diaz Diaz.
+Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
 distribute and modify it.
diff --git a/arg_parser.cc b/arg_parser.cc
index 551264a..82972ad 100644
--- a/arg_parser.cc
+++ b/arg_parser.cc
@@ -1,5 +1,5 @@
 /*  Arg_parser - POSIX/GNU command line argument parser. (C++ version)
-    Copyright (C) 2006-2015 Antonio Diaz Diaz.
+    Copyright (C) 2006-2016 Antonio Diaz Diaz.
 
     This library is free software. Redistribution and use in source and
     binary forms, with or without modification, are permitted provided
diff --git a/arg_parser.h b/arg_parser.h
index 3dc85d0..f45b9ac 100644
--- a/arg_parser.h
+++ b/arg_parser.h
@@ -1,5 +1,5 @@
 /*  Arg_parser - POSIX/GNU command line argument parser. (C++ version)
-    Copyright (C) 2006-2015 Antonio Diaz Diaz.
+    Copyright (C) 2006-2016 Antonio Diaz Diaz.
 
     This library is free software. Redistribution and use in source and
     binary forms, with or without modification, are permitted provided
diff --git a/compress.cc b/compress.cc
index ecc7e5e..56d5314 100644
--- a/compress.cc
+++ b/compress.cc
@@ -1,6 +1,6 @@
 /*  Plzip - Parallel compressor compatible with lzip
     Copyright (C) 2009 Laszlo Ersek.
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -77,14 +77,14 @@ int writeblock( const int fd, const uint8_t * const buf, const int size )
   }
 
 
-void xinit( pthread_mutex_t * const mutex )
+void xinit_mutex( pthread_mutex_t * const mutex )
   {
   const int errcode = pthread_mutex_init( mutex, 0 );
   if( errcode )
     { show_error( "pthread_mutex_init", errcode ); cleanup_and_fail(); }
   }
 
-void xinit( pthread_cond_t * const cond )
+void xinit_cond( pthread_cond_t * const cond )
   {
   const int errcode = pthread_cond_init( cond, 0 );
   if( errcode )
@@ -92,14 +92,14 @@ void xinit( pthread_cond_t * const cond )
   }
 
 
-void xdestroy( pthread_mutex_t * const mutex )
+void xdestroy_mutex( pthread_mutex_t * const mutex )
   {
   const int errcode = pthread_mutex_destroy( mutex );
   if( errcode )
     { show_error( "pthread_mutex_destroy", errcode ); cleanup_and_fail(); }
   }
 
-void xdestroy( pthread_cond_t * const cond )
+void xdestroy_cond( pthread_cond_t * const cond )
   {
   const int errcode = pthread_cond_destroy( cond );
   if( errcode )
@@ -196,14 +196,14 @@ public:
       slot_tally( slots ), circular_buffer( slots, (Packet *) 0 ),
       num_working( workers ), num_slots( slots ), eof( false )
     {
-    xinit( &imutex ); xinit( &iav_or_eof );
-    xinit( &omutex ); xinit( &oav_or_exit );
+    xinit_mutex( &imutex ); xinit_cond( &iav_or_eof );
+    xinit_mutex( &omutex ); xinit_cond( &oav_or_exit );
     }
 
   ~Packet_courier()
     {
-    xdestroy( &oav_or_exit ); xdestroy( &omutex );
-    xdestroy( &iav_or_eof ); xdestroy( &imutex );
+    xdestroy_cond( &oav_or_exit ); xdestroy_mutex( &omutex );
+    xdestroy_cond( &iav_or_eof ); xdestroy_mutex( &imutex );
     }
 
   // make a packet with data received from splitter
diff --git a/configure b/configure
index 1c20dc4..d920870 100755
--- a/configure
+++ b/configure
@@ -1,12 +1,12 @@
 #! /bin/sh
 # configure script for Plzip - Parallel compressor compatible with lzip
-# Copyright (C) 2009-2015 Antonio Diaz Diaz.
+# Copyright (C) 2009-2016 Antonio Diaz Diaz.
 #
 # This configure script is free software: you have unlimited permission
 # to copy, distribute and modify it.
 
 pkgname=plzip
-pkgversion=1.4
+pkgversion=1.5
 progname=plzip
 srctrigger=doc/${pkgname}.texi
 
@@ -26,8 +26,8 @@ CXXFLAGS='-Wall -W -O2'
 LDFLAGS=
 
 # checking whether we are using GNU C++.
-${CXX} --version > /dev/null 2>&1
-if [ $? != 0 ] ; then
+if /bin/sh -c "${CXX} --version" > /dev/null 2>&1 ; then true
+else
 	CXX=c++
 	CXXFLAGS='-W -O2'
 fi
@@ -139,7 +139,7 @@ if [ -z "${no_create}" ] ; then
 	rm -f config.status
 	cat > config.status << EOF
 #! /bin/sh
-# This file was generated automatically by configure. Do not edit.
+# This file was generated automatically by configure. Don't edit.
 # Run this file to recreate the current configuration.
 #
 # This script is free software: you have unlimited permission
@@ -165,8 +165,8 @@ echo "LDFLAGS = ${LDFLAGS}"
 rm -f Makefile
 cat > Makefile << EOF
 # Makefile for Plzip - Parallel compressor compatible with lzip
-# Copyright (C) 2009-2015 Antonio Diaz Diaz.
-# This file was generated automatically by configure. Do not edit.
+# Copyright (C) 2009-2016 Antonio Diaz Diaz.
+# This file was generated automatically by configure. Don't edit.
 #
 # This Makefile is free software: you have unlimited permission
 # to copy, distribute and modify it.
diff --git a/dec_stdout.cc b/dec_stdout.cc
index 798148e..620075e 100644
--- a/dec_stdout.cc
+++ b/dec_stdout.cc
@@ -1,6 +1,6 @@
 /*  Plzip - Parallel compressor compatible with lzip
     Copyright (C) 2009 Laszlo Ersek.
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -76,14 +76,14 @@ public:
       opacket_queues( workers ), num_working( workers ),
       num_workers( workers ), out_slots( slots ), slot_av( workers )
     {
-    xinit( &omutex ); xinit( &oav_or_exit );
-    for( unsigned i = 0; i < slot_av.size(); ++i ) xinit( &slot_av[i] );
+    xinit_mutex( &omutex ); xinit_cond( &oav_or_exit );
+    for( unsigned i = 0; i < slot_av.size(); ++i ) xinit_cond( &slot_av[i] );
     }
 
   ~Packet_courier()
     {
-    for( unsigned i = 0; i < slot_av.size(); ++i ) xdestroy( &slot_av[i] );
-    xdestroy( &oav_or_exit ); xdestroy( &omutex );
+    for( unsigned i = 0; i < slot_av.size(); ++i ) xdestroy_cond( &slot_av[i] );
+    xdestroy_cond( &oav_or_exit ); xdestroy_mutex( &omutex );
     }
 
   void worker_finished()
diff --git a/dec_stream.cc b/dec_stream.cc
index 93fc8de..e074ee2 100644
--- a/dec_stream.cc
+++ b/dec_stream.cc
@@ -1,6 +1,6 @@
 /*  Plzip - Parallel compressor compatible with lzip
     Copyright (C) 2009 Laszlo Ersek.
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -88,16 +88,16 @@ public:
       num_workers( workers ), out_slots( oslots ), slot_av( workers ),
       eof( false )
     {
-    xinit( &imutex ); xinit( &iav_or_eof );
-    xinit( &omutex ); xinit( &oav_or_exit );
-    for( unsigned i = 0; i < slot_av.size(); ++i ) xinit( &slot_av[i] );
+    xinit_mutex( &imutex ); xinit_cond( &iav_or_eof );
+    xinit_mutex( &omutex ); xinit_cond( &oav_or_exit );
+    for( unsigned i = 0; i < slot_av.size(); ++i ) xinit_cond( &slot_av[i] );
     }
 
   ~Packet_courier()
     {
-    for( unsigned i = 0; i < slot_av.size(); ++i ) xdestroy( &slot_av[i] );
-    xdestroy( &oav_or_exit ); xdestroy( &omutex );
-    xdestroy( &iav_or_eof ); xdestroy( &imutex );
+    for( unsigned i = 0; i < slot_av.size(); ++i ) xdestroy_cond( &slot_av[i] );
+    xdestroy_cond( &oav_or_exit ); xdestroy_mutex( &omutex );
+    xdestroy_cond( &iav_or_eof ); xdestroy_mutex( &imutex );
     }
 
   // make a packet with data received from splitter
@@ -345,6 +345,7 @@ struct Worker_arg
   Packet_courier * courier;
   const Pretty_print * pp;
   int worker_id;
+  bool ignore_trailing;
   bool testing;
   };
 
@@ -357,6 +358,7 @@ extern "C" void * dworker_s( void * arg )
   Packet_courier & courier = *tmp.courier;
   const Pretty_print & pp = *tmp.pp;
   const int worker_id = tmp.worker_id;
+  const bool ignore_trailing = tmp.ignore_trailing;
   const bool testing = tmp.testing;
 
   uint8_t * new_data = new( std::nothrow ) uint8_t[max_packet_size];
@@ -392,7 +394,11 @@ extern "C" void * dworker_s( void * arg )
         if( rd < 0 )
           {
           if( LZ_decompress_errno( decoder ) == LZ_header_error )
+            {
             trailing_garbage_found = true;
+            if( !ignore_trailing )
+              { pp( "Trailing data not allowed." ); cleanup_and_fail( 2 ); }
+            }
           else
             cleanup_and_fail( decompress_read_error( decoder, pp, worker_id ) );
           }
@@ -461,7 +467,8 @@ void muxer( Packet_courier & courier, const Pretty_print & pp, const int outfd )
     // init the courier, then start the splitter and the workers and,
     // if not testing, call the muxer.
 int dec_stream( const int num_workers, const int infd, const int outfd,
-                const Pretty_print & pp, const int debug_level )
+                const Pretty_print & pp, const int debug_level,
+                const bool ignore_trailing )
   {
   const int in_slots_per_worker = 2;
   const int out_slots = 32;
@@ -490,6 +497,7 @@ int dec_stream( const int num_workers, const int infd, const int outfd,
     worker_args[i].courier = &courier;
     worker_args[i].pp = &pp;
     worker_args[i].worker_id = i;
+    worker_args[i].ignore_trailing = ignore_trailing;
     worker_args[i].testing = ( outfd < 0 );
     errcode = pthread_create( &worker_threads[i], 0, dworker_s, &worker_args[i] );
     if( errcode )
diff --git a/decompress.cc b/decompress.cc
index 4c6b946..3511921 100644
--- a/decompress.cc
+++ b/decompress.cc
@@ -1,6 +1,6 @@
 /*  Plzip - Parallel compressor compatible with lzip
     Copyright (C) 2009 Laszlo Ersek.
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -45,7 +45,7 @@ void Pretty_print::operator()( const char * const msg ) const
       {
       first_post = false;
       std::fprintf( stderr, "  %s: ", name_.c_str() );
-      for( unsigned i = 0; i < longest_name - name_.size(); ++i )
+      for( unsigned i = name_.size(); i < longest_name; ++i )
         std::fputc( ' ', stderr );
       if( !msg ) std::fflush( stderr );
       }
@@ -213,16 +213,16 @@ extern "C" void * dworker( void * arg )
     // start the workers and wait for them to finish.
 int decompress( int num_workers, const int infd, const int outfd,
                 const Pretty_print & pp, const int debug_level,
-                const bool infd_isreg )
+                const bool ignore_trailing, const bool infd_isreg )
   {
   if( !infd_isreg )
-    return dec_stream( num_workers, infd, outfd, pp, debug_level );
+    return dec_stream( num_workers, infd, outfd, pp, debug_level, ignore_trailing );
 
-  const File_index file_index( infd );
+  const File_index file_index( infd, ignore_trailing );
   if( file_index.retval() == 1 )
     {
     lseek( infd, 0, SEEK_SET );
-    return dec_stream( num_workers, infd, outfd, pp, debug_level );
+    return dec_stream( num_workers, infd, outfd, pp, debug_level, ignore_trailing );
     }
   if( file_index.retval() != 0 )
     { pp( file_index.error().c_str() ); return file_index.retval(); }
diff --git a/doc/plzip.1 b/doc/plzip.1
index 01f4e36..5a61596 100644
--- a/doc/plzip.1
+++ b/doc/plzip.1
@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH PLZIP "1" "July 2015" "plzip 1.4" "User Commands"
+.TH PLZIP "1" "May 2016" "plzip 1.5" "User Commands"
 .SH NAME
 plzip \- reduces the size of files
 .SH SYNOPSIS
@@ -15,11 +15,14 @@ display this help and exit
 \fB\-V\fR, \fB\-\-version\fR
 output version information and exit
 .TP
+\fB\-a\fR, \fB\-\-trailing\-error\fR
+exit with error status if trailing data
+.TP
 \fB\-B\fR, \fB\-\-data\-size=\fR<bytes>
 set size of input data blocks [2x8=16 MiB]
 .TP
 \fB\-c\fR, \fB\-\-stdout\fR
-send output to standard output
+write to standard output, keep input files
 .TP
 \fB\-d\fR, \fB\-\-decompress\fR
 decompress
@@ -40,7 +43,7 @@ set match length limit in bytes [36]
 set number of (de)compression threads [2]
 .TP
 \fB\-o\fR, \fB\-\-output=\fR<file>
-if reading stdin, place the output into <file>
+if reading standard input, write to <file>
 .TP
 \fB\-q\fR, \fB\-\-quiet\fR
 suppress all messages
@@ -63,13 +66,16 @@ alias for \fB\-0\fR
 \fB\-\-best\fR
 alias for \fB\-9\fR
 .PP
-If no file names are given, plzip compresses or decompresses
-from standard input to standard output.
+If no file names are given, or if a file is '\-', plzip compresses or
+decompresses from standard input to standard output.
 Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,
 Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...
+Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2^12
+to 2^29 bytes.
+.PP
 The bidimensional parameter space of LZMA can't be mapped to a linear
 scale optimal for all files. If your files are large, very repetitive,
-etc, you may need to use the \fB\-\-match\-length\fR and \fB\-\-dictionary\-size\fR
+etc, you may need to use the \fB\-\-dictionary\-size\fR and \fB\-\-match\-length\fR
 options directly to achieve optimal performance.
 .PP
 Exit status: 0 for a normal exit, 1 for environmental problems (file
@@ -83,8 +89,8 @@ Plzip home page: http://www.nongnu.org/lzip/plzip.html
 .SH COPYRIGHT
 Copyright \(co 2009 Laszlo Ersek.
 .br
-Copyright \(co 2015 Antonio Diaz Diaz.
-Using lzlib 1.7
+Copyright \(co 2016 Antonio Diaz Diaz.
+Using lzlib 1.8
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
diff --git a/doc/plzip.info b/doc/plzip.info
index 474db91..a814b3f 100644
--- a/doc/plzip.info
+++ b/doc/plzip.info
@@ -11,7 +11,7 @@ File: plzip.info,  Node: Top,  Next: Introduction,  Up: (dir)
 Plzip Manual
 ************
 
-This manual is for Plzip (version 1.4, 9 July 2015).
+This manual is for Plzip (version 1.5, 14 May 2016).
 
 * Menu:
 
@@ -21,11 +21,13 @@ This manual is for Plzip (version 1.4, 9 July 2015).
 * File format::            Detailed format of the compressed file
 * Memory requirements::    Memory required to compress and decompress
 * Minimum file sizes::     Minimum file sizes required for full speed
+* Trailing data::          Extra data appended to the file
+* Examples::               A small tutorial with examples
 * Problems::               Reporting bugs
 * Concept index::          Index of concepts
 
 
-   Copyright (C) 2009-2015 Antonio Diaz Diaz.
+   Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
    This manual is free documentation: you have unlimited permission to
 copy, distribute and modify it.
@@ -59,7 +61,7 @@ availability:
      recovery means. The lziprecover program can repair bit-flip errors
      (one of the most common forms of data corruption) in lzip files,
      and provides data recovery capabilities, including error-checked
-     merging of damaged copies of a file.  *note Data safety:
+     merging of damaged copies of a file.  *Note Data safety:
      (lziprecover)Data safety.
 
    * The lzip format is as simple as possible (but not simpler). The
@@ -115,13 +117,6 @@ two or more compressed files. The result is the concatenation of the
 corresponding uncompressed files. Integrity testing of concatenated
 compressed files is also supported.
 
-   WARNING! Even if plzip is bug-free, other causes may result in a
-corrupt compressed file (bugs in the system libraries, memory errors,
-etc).  Therefore, if the data you are going to compress are important,
-give the '--keep' option to plzip and do not remove the original file
-until you verify the compressed file with a command like
-'plzip -cd file.lz | cmp file -'.
-
 
 File: plzip.info,  Node: Invoking plzip,  Next: Program design,  Prev: Introduction,  Up: Top
 
@@ -132,6 +127,10 @@ The format for running plzip is:
 
      plzip [OPTIONS] [FILES]
 
+'-' used as a FILE argument means standard input. It can be mixed with
+other FILES and is read just once, the first time it appears in the
+command line.
+
    Plzip supports the following options:
 
 '-h'
@@ -142,6 +141,13 @@ The format for running plzip is:
 '--version'
      Print the version number of plzip on the standard output and exit.
 
+'-a'
+'--trailing-error'
+     Exit with error status 2 if any remaining input is detected after
+     decompressing the last member. Such remaining input is usually
+     trailing garbage that can be safely ignored. *Note
+     concat-example::.
+
 '-B BYTES'
 '--data-size=BYTES'
      Set the size of the input data blocks, in bytes. The input file
@@ -153,12 +159,17 @@ The format for running plzip is:
 
 '-c'
 '--stdout'
-     Compress or decompress to standard output. Needed when reading
-     from a named pipe (fifo) or from a device.
+     Compress or decompress to standard output; keep input files
+     unchanged.  If compressing several files, each file is compressed
+     independently.  This option is needed when reading from a named
+     pipe (fifo) or from a device.
 
 '-d'
 '--decompress'
-     Decompress.
+     Decompress the specified file(s). If a file does not exist or
+     can't be opened, plzip continues decompressing the rest of the
+     files. If a file fails to decompress, plzip exits immediately
+     without decompressing the rest of the files.
 
 '-f'
 '--force'
@@ -207,12 +218,13 @@ The format for running plzip is:
 
 '-s BYTES'
 '--dictionary-size=BYTES'
-     Set the dictionary size limit in bytes. Valid values range from 4
-     KiB to 512 MiB. Plzip will use the smallest possible dictionary
-     size for each file without exceeding this limit. Note that
-     dictionary sizes are quantized. If the specified size does not
-     match one of the valid sizes, it will be rounded upwards by adding
-     up to (BYTES / 16) to it.
+     Set the dictionary size limit in bytes. Plzip will use the smallest
+     possible dictionary size for each file without exceeding this
+     limit.  Valid values range from 4 KiB to 512 MiB. Values 12 to 29
+     are interpreted as powers of two, meaning 2^12 to 2^29 bytes. Note
+     that dictionary sizes are quantized. If the specified size does
+     not match one of the valid sizes, it will be rounded upwards by
+     adding up to (BYTES / 8) to it.
 
      For maximum compression you should use a dictionary size limit as
      large as possible, but keep in mind that the decompression memory
@@ -224,7 +236,8 @@ The format for running plzip is:
      Check integrity of the specified file(s), but don't decompress
      them.  This really performs a trial decompression and throws away
      the result.  Use it together with '-v' to see information about
-     the file.
+     the file(s). If a file fails the test, plzip may be unable to
+     check the rest of the files.
 
 '-v'
 '--verbose'
@@ -237,14 +250,14 @@ The format for running plzip is:
 
 '-0 .. -9'
      Set the compression parameters (dictionary size and match length
-     limit) as shown in the table below. Note that '-9' can be much
-     slower than '-0'. These options have no effect when decompressing.
+     limit) as shown in the table below. The default compression level
+     is '-6'.  Note that '-9' can be much slower than '-0'. These
+     options have no effect when decompressing.
 
      The bidimensional parameter space of LZMA can't be mapped to a
      linear scale optimal for all files. If your files are large, very
-     repetitive, etc, you may need to use the '--match-length' and
-     '--dictionary-size' options directly to achieve optimal
-     performance.
+     repetitive, etc, you may need to use the '--dictionary-size' and
+     '--match-length' options directly to achieve optimal performance.
 
      Level   Dictionary size   Match length limit
      -0      64 KiB            16 bytes
@@ -292,7 +305,7 @@ File: plzip.info,  Node: Program design,  Next: File format,  Prev: Invoking plz
 
 When compressing, plzip divides the input file into chunks and
 compresses as many chunks simultaneously as worker threads are chosen,
-creating a multi-member compressed file.
+creating a multimember compressed file.
 
    When decompressing, plzip decompresses as many members
 simultaneously as worker threads are chosen. Files that were compressed
@@ -348,12 +361,12 @@ additional information before, between, or after them.
 
    Each member has the following structure:
 +--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-| ID string | VN | DS | Lzma stream | CRC32 |   Data size   |  Member size  |
+| ID string | VN | DS | LZMA stream | CRC32 |   Data size   |  Member size  |
 +--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
    All multibyte values are stored in little endian order.
 
-'ID string'
+'ID string (the "magic" bytes)'
      A four byte string, identifying the lzip format, with the value
      "LZIP" (0x4C, 0x5A, 0x49, 0x50).
 
@@ -371,8 +384,8 @@ additional information before, between, or after them.
      Example: 0xD3 = 2^19 - 6 * 2^15 = 512 KiB - 6 * 32 KiB = 320 KiB
      Valid values for dictionary size range from 4 KiB to 512 MiB.
 
-'Lzma stream'
-     The lzma stream, finished by an end of stream marker. Uses default
+'LZMA stream'
+     The LZMA stream, finished by an end of stream marker. Uses default
      values for encoder properties.  *Note Stream format: (lzip)Stream
      format, for a complete description.
 
@@ -386,7 +399,7 @@ additional information before, between, or after them.
      Total size of the member, including header and trailer. This field
      acts as a distributed index, allows the verification of stream
      integrity, and facilitates safe recovery of undamaged members from
-     multi-member files.
+     multimember files.
 
 
 
@@ -408,7 +421,7 @@ following:
      file, or for testing of a regular file; the dictionary size.
 
      (Note that regular files with more than 1024 bytes of trailing
-     garbage are treated as non-seekable).
+     data are treated as non-seekable).
 
    * For testing of a non-seekable file or of standard input; the
      dictionary size plus up to 5 MiB.
@@ -420,14 +433,14 @@ following:
      dictionary size plus up to 35 MiB.
 
 
-File: plzip.info,  Node: Minimum file sizes,  Next: Problems,  Prev: Memory requirements,  Up: Top
+File: plzip.info,  Node: Minimum file sizes,  Next: Trailing data,  Prev: Memory requirements,  Up: Top
 
 6 Minimum file sizes required for full compression speed
 ********************************************************
 
 When compressing, plzip divides the input file into chunks and
 compresses as many chunks simultaneously as worker threads are chosen,
-creating a multi-member compressed file.
+creating a multimember compressed file.
 
    For this to work as expected (and roughly multiply the compression
 speed by the number of available processors), the uncompressed file
@@ -456,9 +469,106 @@ Level
 -9           128 MiB   256 MiB   512 MiB   1 GiB     4 GiB     16 GiB
 
 
-File: plzip.info,  Node: Problems,  Next: Concept index,  Prev: Minimum file sizes,  Up: Top
+File: plzip.info,  Node: Trailing data,  Next: Examples,  Prev: Minimum file sizes,  Up: Top
+
+7 Extra data appended to the file
+*********************************
+
+Sometimes extra data is found appended to a lzip file after the last
+member. Such trailing data may be:
+
+   * Padding added to make the file size a multiple of some block size,
+     for example when writing to a tape.
+
+   * Garbage added by some not totally successful copy operation.
+
+   * Useful data added by the user; a cryptographically secure hash, a
+     description of file contents, etc.
+
+   * Malicious data added to the file in order to make its total size
+     and hash value (for a chosen hash) coincide with those of another
+     file.
+
+   * In very rare cases, trailing data could be the corrupt header of
+     another member. In multimember or concatenated files the
+     probability of corruption happening in the magic bytes is 5 times
+     smaller than the probability of getting a false positive caused by
+     the corruption of the integrity information itself. Therefore it
+     can be considered to be below the noise level.
+
+   Trailing data can be safely ignored in most cases. In some cases,
+like that of user-added data, it is expected to be ignored. In those
+cases where a file containing trailing data must be rejected, the option
+'--trailing-error' can be used. *Note --trailing-error::.
+
+
+File: plzip.info,  Node: Examples,  Next: Problems,  Prev: Trailing data,  Up: Top
+
+8 A small tutorial with examples
+********************************
+
+WARNING! Even if plzip is bug-free, other causes may result in a corrupt
+compressed file (bugs in the system libraries, memory errors, etc).
+Therefore, if the data you are going to compress are important, give the
+'--keep' option to plzip and don't remove the original file until you
+verify the compressed file with a command like
+'plzip -cd file.lz | cmp file -'.
+
+
+Example 1: Replace a regular file with its compressed version 'file.lz'
+and show the compression ratio.
+
+     plzip -v file
+
+
+Example 2: Like example 1 but the created 'file.lz' has a block size of
+1 MiB. The compression ratio is not shown.
+
+     plzip -B 1MiB file
+
+
+Example 3: Restore a regular file from its compressed version
+'file.lz'. If the operation is successful, 'file.lz' is removed.
+
+     plzip -d file.lz
+
+
+Example 4: Verify the integrity of the compressed file 'file.lz' and
+show status.
+
+     plzip -tv file.lz
+
+
+Example 5: Compress a whole device in /dev/sdc and send the output to
+'file.lz'.
+
+     plzip -c /dev/sdc > file.lz
+
+
+Example 6: The right way of concatenating compressed files.  *Note
+Trailing data::.
+
+     Don't do this
+       cat file1.lz file2.lz file3.lz | plzip -d
+     Do this instead
+       plzip -cd file1.lz file2.lz file3.lz
+
+
+Example 7: Decompress 'file.lz' partially until 10 KiB of decompressed
+data are produced.
+
+     plzip -cd file.lz | dd bs=1024 count=10
+
+
+Example 8: Decompress 'file.lz' partially from decompressed byte 10000
+to decompressed byte 15000 (5000 bytes are produced).
+
+     plzip -cd file.lz | dd bs=1000 skip=10 count=5
+
+
+File: plzip.info,  Node: Problems,  Next: Concept index,  Prev: Examples,  Up: Top
 
-7 Reporting bugs
+9 Reporting bugs
 ****************
 
 There are probably bugs in plzip. There are certainly errors and
@@ -480,6 +590,7 @@ Concept index
 * Menu:
 
 * bugs:                                  Problems.              (line 6)
+* examples:                              Examples.              (line 6)
 * file format:                           File format.           (line 6)
 * getting help:                          Problems.              (line 6)
 * introduction:                          Introduction.          (line 6)
@@ -488,6 +599,7 @@ Concept index
 * minimum file sizes:                    Minimum file sizes.    (line 6)
 * options:                               Invoking plzip.        (line 6)
 * program design:                        Program design.        (line 6)
+* trailing data:                         Trailing data.         (line 6)
 * usage:                                 Invoking plzip.        (line 6)
 * version:                               Invoking plzip.        (line 6)
 
@@ -495,15 +607,19 @@ Concept index
 
 Tag Table:
 Node: Top221
-Node: Introduction984
-Node: Invoking plzip5332
-Ref: --data-size5747
-Node: Program design10972
-Node: File format12560
-Node: Memory requirements14973
-Node: Minimum file sizes16085
-Node: Problems18007
-Node: Concept index18543
+Node: Introduction1101
+Node: Invoking plzip5078
+Ref: --trailing-error5647
+Ref: --data-size5890
+Node: Program design11683
+Node: File format13270
+Node: Memory requirements15702
+Node: Minimum file sizes16811
+Node: Trailing data18737
+Node: Examples20121
+Ref: concat-example21286
+Node: Problems21823
+Node: Concept index22349
 
 End Tag Table
 
diff --git a/doc/plzip.texi b/doc/plzip.texi
index e13515a..c459cde 100644
--- a/doc/plzip.texi
+++ b/doc/plzip.texi
@@ -6,8 +6,8 @@
 @finalout
 @c %**end of header
 
-@set UPDATED 9 July 2015
-@set VERSION 1.4
+@set UPDATED 14 May 2016
+@set VERSION 1.5
 
 @dircategory Data Compression
 @direntry
@@ -41,12 +41,14 @@ This manual is for Plzip (version @value{VERSION}, @value{UPDATED}).
 * File format::            Detailed format of the compressed file
 * Memory requirements::    Memory required to compress and decompress
 * Minimum file sizes::     Minimum file sizes required for full speed
+* Trailing data::          Extra data appended to the file
+* Examples::               A small tutorial with examples
 * Problems::               Reporting bugs
 * Concept index::          Index of concepts
 @end menu
 
 @sp 1
-Copyright @copyright{} 2009-2015 Antonio Diaz Diaz.
+Copyright @copyright{} 2009-2016 Antonio Diaz Diaz.
 
 This manual is free documentation: you have unlimited permission
 to copy, distribute and modify it.
@@ -83,7 +85,7 @@ program can repair bit-flip errors (one of the most common forms of data
 corruption) in lzip files, and provides data recovery capabilities,
 including error-checked merging of damaged copies of a file.
 @ifnothtml
-@ref{Data safety,,,lziprecover}.
+@xref{Data safety,,,lziprecover}.
 @end ifnothtml
 
 @item
@@ -144,13 +146,6 @@ or more compressed files. The result is the concatenation of the
 corresponding uncompressed files. Integrity testing of concatenated
 compressed files is also supported.
 
-WARNING! Even if plzip is bug-free, other causes may result in a corrupt
-compressed file (bugs in the system libraries, memory errors, etc).
-Therefore, if the data you are going to compress are important, give the
-@samp{--keep} option to plzip and do not remove the original file until
-you verify the compressed file with a command like
-@w{@samp{plzip -cd file.lz | cmp file -}}.
-
 
 @node Invoking plzip
 @chapter Invoking plzip
@@ -165,6 +160,11 @@ The format for running plzip is:
 plzip [@var{options}] [@var{files}]
 @end example
 
+@noindent
+@samp{-} used as a @var{file} argument means standard input. It can be
+mixed with other @var{files} and is read just once, the first time it
+appears in the command line.
+
 Plzip supports the following options:
 
 @table @code
@@ -176,6 +176,13 @@ Print an informative help message describing the options and exit.
 @itemx --version
 Print the version number of plzip on the standard output and exit.
 
+@anchor{--trailing-error}
+@item -a
+@itemx --trailing-error
+Exit with error status 2 if any remaining input is detected after
+decompressing the last member. Such remaining input is usually trailing
+garbage that can be safely ignored. @xref{concat-example}.
+
 @anchor{--data-size}
 @item -B @var{bytes}
 @itemx --data-size=@var{bytes}
@@ -188,12 +195,17 @@ data size.
 
 @item -c
 @itemx --stdout
-Compress or decompress to standard output. Needed when reading from a
-named pipe (fifo) or from a device.
+Compress or decompress to standard output; keep input files unchanged.
+If compressing several files, each file is compressed independently.
+This option is needed when reading from a named pipe (fifo) or from a
+device.
 
 @item -d
 @itemx --decompress
-Decompress.
+Decompress the specified file(s). If a file does not exist or can't be
+opened, plzip continues decompressing the rest of the files. If a file
+fails to decompress, plzip exits immediately without decompressing the
+rest of the files.
 
 @item -f
 @itemx --force
@@ -238,11 +250,13 @@ Quiet operation. Suppress all messages.
 
 @item -s @var{bytes}
 @itemx --dictionary-size=@var{bytes}
-Set the dictionary size limit in bytes. Valid values range from 4 KiB to
-512 MiB. Plzip will use the smallest possible dictionary size for each
-file without exceeding this limit. Note that dictionary sizes are
-quantized. If the specified size does not match one of the valid sizes,
-it will be rounded upwards by adding up to (@var{bytes} / 16) to it.
+Set the dictionary size limit in bytes. Plzip will use the smallest
+possible dictionary size for each file without exceeding this limit.
+Valid values range from 4 KiB to 512 MiB. Values 12 to 29 are
+interpreted as powers of two, meaning 2^12 to 2^29 bytes. Note that
+dictionary sizes are quantized. If the specified size does not match one
+of the valid sizes, it will be rounded upwards by adding up to
+@w{(@var{bytes} / 8)} to it.
 
 For maximum compression you should use a dictionary size limit as large
 as possible, but keep in mind that the decompression memory requirement
@@ -252,7 +266,9 @@ is affected at compression time by the choice of dictionary size limit.
 @itemx --test
 Check integrity of the specified file(s), but don't decompress them.
 This really performs a trial decompression and throws away the result.
-Use it together with @samp{-v} to see information about the file.
+Use it together with @samp{-v} to see information about the file(s). If
+a file fails the test, plzip may be unable to check the rest of the
+files.
 
 @item -v
 @itemx --verbose
@@ -265,14 +281,14 @@ decompressed size, and compressed size.
 
 @item -0 .. -9
 Set the compression parameters (dictionary size and match length limit)
-as shown in the table below. Note that @samp{-9} can be much slower than
-@samp{-0}. These options have no effect when decompressing.
+as shown in the table below. The default compression level is @samp{-6}.
+Note that @samp{-9} can be much slower than @samp{-0}. These options
+have no effect when decompressing.
 
 The bidimensional parameter space of LZMA can't be mapped to a linear
 scale optimal for all files. If your files are large, very repetitive,
-etc, you may need to use the @samp{--match-length} and
-@samp{--dictionary-size} options directly to achieve optimal
-performance.
+etc, you may need to use the @samp{--dictionary-size} and
+@samp{--match-length} options directly to achieve optimal performance.
 
 @multitable {Level} {Dictionary size} {Match length limit}
 @item Level @tab Dictionary size @tab Match length limit
@@ -324,7 +340,7 @@ caused plzip to panic.
 
 When compressing, plzip divides the input file into chunks and
 compresses as many chunks simultaneously as worker threads are chosen,
-creating a multi-member compressed file.
+creating a multimember compressed file.
 
 When decompressing, plzip decompresses as many members simultaneously as
 worker threads are chosen. Files that were compressed with lzip will not
@@ -383,14 +399,14 @@ additional information before, between, or after them.
 Each member has the following structure:
 @verbatim
 +--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-| ID string | VN | DS | Lzma stream | CRC32 |   Data size   |  Member size  |
+| ID string | VN | DS | LZMA stream | CRC32 |   Data size   |  Member size  |
 +--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 @end verbatim
 
 All multibyte values are stored in little endian order.
 
 @table @samp
-@item ID string
+@item ID string (the "magic" bytes)
 A four byte string, identifying the lzip format, with the value "LZIP"
 (0x4C, 0x5A, 0x49, 0x50).
 
@@ -407,8 +423,8 @@ from the base size to obtain the dictionary size.@*
 Example: 0xD3 = 2^19 - 6 * 2^15 = 512 KiB - 6 * 32 KiB = 320 KiB@*
 Valid values for dictionary size range from 4 KiB to 512 MiB.
 
-@item Lzma stream
-The lzma stream, finished by an end of stream marker. Uses default
+@item LZMA stream
+The LZMA stream, finished by an end of stream marker. Uses default
 values for encoder properties.
 @ifnothtml
 @xref{Stream format,,,lzip},
@@ -428,7 +444,7 @@ Size of the uncompressed original data.
 @item Member size (8 bytes)
 Total size of the member, including header and trailer. This field acts
 as a distributed index, allows the verification of stream integrity, and
-facilitates safe recovery of undamaged members from multi-member files.
+facilitates safe recovery of undamaged members from multimember files.
 
 @end table
 
@@ -453,8 +469,8 @@ times the data size. Default is 136 MiB.
 For decompression of a regular (seekable) file to another regular file,
 or for testing of a regular file; the dictionary size.
 
-(Note that regular files with more than 1024 bytes of trailing garbage
-are treated as non-seekable).
+(Note that regular files with more than 1024 bytes of trailing data are
+treated as non-seekable).
 
 @item
 For testing of a non-seekable file or of standard input; the dictionary
@@ -476,7 +492,7 @@ dictionary size plus up to 35 MiB.
 
 When compressing, plzip divides the input file into chunks and
 compresses as many chunks simultaneously as worker threads are chosen,
-creating a multi-member compressed file.
+creating a multimember compressed file.
 
 For this to work as expected (and roughly multiply the compression speed
 by the number of available processors), the uncompressed file must be at
@@ -506,6 +522,133 @@ data size for each level:
 @end multitable
 
 
+@node Trailing data
+@chapter Extra data appended to the file
+@cindex trailing data
+
+Sometimes extra data is found appended to a lzip file after the last
+member. Such trailing data may be:
+
+@itemize @bullet
+@item
+Padding added to make the file size a multiple of some block size, for
+example when writing to a tape.
+
+@item
+Garbage added by some not totally successful copy operation.
+
+@item
+Useful data added by the user; a cryptographically secure hash, a
+description of file contents, etc.
+
+@item
+Malicious data added to the file in order to make its total size and
+hash value (for a chosen hash) coincide with those of another file.
+
+@item
+In very rare cases, trailing data could be the corrupt header of another
+member. In multimember or concatenated files the probability of
+corruption happening in the magic bytes is 5 times smaller than the
+probability of getting a false positive caused by the corruption of the
+integrity information itself. Therefore it can be considered to be below
+the noise level.
+@end itemize
+
+Trailing data can be safely ignored in most cases. In some cases, like
+that of user-added data, it is expected to be ignored. In those cases
+where a file containing trailing data must be rejected, the option
+@samp{--trailing-error} can be used. @xref{--trailing-error}.
+
+
+@node Examples
+@chapter A small tutorial with examples
+@cindex examples
+
+WARNING! Even if plzip is bug-free, other causes may result in a corrupt
+compressed file (bugs in the system libraries, memory errors, etc).
+Therefore, if the data you are going to compress are important, give the
+@samp{--keep} option to plzip and don't remove the original file until
+you verify the compressed file with a command like
+@w{@samp{plzip -cd file.lz | cmp file -}}.
+
+@sp 1
+@noindent
+Example 1: Replace a regular file with its compressed version
+@samp{file.lz} and show the compression ratio.
+
+@example
+plzip -v file
+@end example
+
+@sp 1
+@noindent
+Example 2: Like example 1 but the created @samp{file.lz} has a block
+size of 1 MiB. The compression ratio is not shown.
+
+@example
+plzip -B 1MiB file
+@end example
+
+@sp 1
+@noindent
+Example 3: Restore a regular file from its compressed version
+@samp{file.lz}. If the operation is successful, @samp{file.lz} is
+removed.
+
+@example
+plzip -d file.lz
+@end example
+
+@sp 1
+@noindent
+Example 4: Verify the integrity of the compressed file @samp{file.lz}
+and show status.
+
+@example
+plzip -tv file.lz
+@end example
+
+@sp 1
+@noindent
+Example 5: Compress a whole device in /dev/sdc and send the output to
+@samp{file.lz}.
+
+@example
+plzip -c /dev/sdc > file.lz
+@end example
+
+@sp 1
+@anchor{concat-example}
+@noindent
+Example 6: The right way of concatenating compressed files.
+@xref{Trailing data}.
+
+@example
+Don't do this
+  cat file1.lz file2.lz file3.lz | plzip -d
+Do this instead
+  plzip -cd file1.lz file2.lz file3.lz
+@end example
+
+@sp 1
+@noindent
+Example 7: Decompress @samp{file.lz} partially until 10 KiB of
+decompressed data are produced.
+
+@example
+plzip -cd file.lz | dd bs=1024 count=10
+@end example
+
+@sp 1
+@noindent
+Example 8: Decompress @samp{file.lz} partially from decompressed byte
+10000 to decompressed byte 15000 (5000 bytes are produced).
+
+@example
+plzip -cd file.lz | dd bs=1000 skip=10 count=5
+@end example
+
+
 @node Problems
 @chapter Reporting bugs
 @cindex bugs
diff --git a/file_index.cc b/file_index.cc
index 7e265a1..0e48833 100644
--- a/file_index.cc
+++ b/file_index.cc
@@ -1,5 +1,5 @@
 /*  Plzip - Parallel compressor compatible with lzip
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -50,11 +50,11 @@ void File_index::set_num_error( const char * const msg1, unsigned long long num,
   char buf[80];
   snprintf( buf, sizeof buf, "%s%llu%s", msg1, num, msg2 );
   error_ = buf;
-  retval_ = member_vector.empty() ? 1 : 2;	// maybe trailing garbage
+  retval_ = member_vector.empty() ? 1 : 2;	// maybe trailing data
   }
 
 
-File_index::File_index( const int infd )
+File_index::File_index( const int infd, const bool ignore_garbage )
   : retval_( 0 )
   {
   const long long isize = lseek( infd, 0, SEEK_END );
@@ -88,7 +88,10 @@ File_index::File_index( const int infd )
     if( member_size < min_member_size || member_size > pos )
       {
       if( member_vector.empty() && isize - pos < max_garbage )
-        { --pos; continue; }			// maybe trailing garbage
+        {
+        if( ignore_garbage ) { --pos; continue; }	// maybe trailing data
+        error_ = "Trailing data not allowed."; retval_ = 2; return;
+        }
       set_num_error( "Member size in trailer is corrupt at pos ", pos - 8 );
       break;
       }
@@ -98,7 +101,10 @@ File_index::File_index( const int infd )
     if( !header.verify_magic() || !header.verify_version() )
       {
       if( member_vector.empty() && isize - pos < max_garbage )
-        { --pos; continue; }			// maybe trailing garbage
+        {
+        if( ignore_garbage ) { --pos; continue; }	// maybe trailing data
+        error_ = "Trailing data not allowed."; retval_ = 2; return;
+        }
       set_num_error( "Bad header at pos ", pos - member_size );
       break;
       }
diff --git a/file_index.h b/file_index.h
index 1159f1d..8345796 100644
--- a/file_index.h
+++ b/file_index.h
@@ -1,5 +1,5 @@
 /*  Plzip - Parallel compressor compatible with lzip
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -57,7 +57,7 @@ class File_index
                       const char * const msg2 = "" );
 
 public:
-  explicit File_index( const int infd );
+  File_index( const int infd, const bool ignore_garbage );
 
   long members() const { return member_vector.size(); }
   const std::string & error() const { return error_; }
diff --git a/lzip.h b/lzip.h
index cef99dc..34c9a81 100644
--- a/lzip.h
+++ b/lzip.h
@@ -1,5 +1,5 @@
 /*  Plzip - Parallel compressor compatible with lzip
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -15,6 +15,10 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#ifndef LZ_API_VERSION
+#define LZ_API_VERSION 1
+#endif
+
 enum {
   min_dictionary_bits = 12,
   min_dictionary_size = 1 << min_dictionary_bits,
@@ -31,9 +35,11 @@ class Pretty_print
   mutable bool first_post;
 
 public:
-  explicit Pretty_print( const std::vector< std::string > & filenames )
+  Pretty_print( const std::vector< std::string > & filenames,
+                const int verbosity )
     : stdin_name( "(stdin)" ), longest_name( 0 ), first_post( false )
     {
+    if( verbosity <= 0 ) return;
     const unsigned stdin_name_len = std::strlen( stdin_name );
     for( unsigned i = 0; i < filenames.size(); ++i )
       {
@@ -57,6 +63,11 @@ public:
   };
 
 
+inline bool isvalid_ds( const unsigned dictionary_size )
+  { return ( dictionary_size >= min_dictionary_size &&
+             dictionary_size <= max_dictionary_size ); }
+
+
 inline int real_bits( unsigned value )
   {
   int bits = 0;
@@ -91,20 +102,17 @@ struct File_header
 
   bool dictionary_size( const unsigned sz )
     {
-    if( sz >= min_dictionary_size && sz <= max_dictionary_size )
+    if( !isvalid_ds( sz ) ) return false;
+    data[5] = real_bits( sz - 1 );
+    if( sz > min_dictionary_size )
       {
-      data[5] = real_bits( sz - 1 );
-      if( sz > min_dictionary_size )
-        {
-        const unsigned base_size = 1 << data[5];
-        const unsigned fraction = base_size / 16;
-        for( int i = 7; i >= 1; --i )
-          if( base_size - ( i * fraction ) >= sz )
-            { data[5] |= ( i << 5 ); break; }
-        }
-      return true;
+      const unsigned base_size = 1 << data[5];
+      const unsigned fraction = base_size / 16;
+      for( int i = 7; i >= 1; --i )
+        if( base_size - ( i * fraction ) >= sz )
+          { data[5] |= ( i << 5 ); break; }
       }
-    return false;
+    return true;
     }
   };
 
@@ -152,10 +160,10 @@ struct File_trailer
 // defined in compress.cc
 int readblock( const int fd, uint8_t * const buf, const int size );
 int writeblock( const int fd, const uint8_t * const buf, const int size );
-void xinit( pthread_mutex_t * const mutex );
-void xinit( pthread_cond_t * const cond );
-void xdestroy( pthread_mutex_t * const mutex );
-void xdestroy( pthread_cond_t * const cond );
+void xinit_mutex( pthread_mutex_t * const mutex );
+void xinit_cond( pthread_cond_t * const cond );
+void xdestroy_mutex( pthread_mutex_t * const mutex );
+void xdestroy_cond( pthread_cond_t * const cond );
 void xlock( pthread_mutex_t * const mutex );
 void xunlock( pthread_mutex_t * const mutex );
 void xwait( pthread_cond_t * const cond, pthread_mutex_t * const mutex );
@@ -176,7 +184,8 @@ int dec_stdout( const int num_workers, const int infd, const int outfd,
 
 // defined in dec_stream.cc
 int dec_stream( const int num_workers, const int infd, const int outfd,
-                const Pretty_print & pp, const int debug_level );
+                const Pretty_print & pp, const int debug_level,
+                const bool ignore_garbage );
 
 // defined in decompress.cc
 int preadblock( const int fd, uint8_t * const buf, const int size,
@@ -187,7 +196,7 @@ int decompress_read_error( struct LZ_Decoder * const decoder,
                            const Pretty_print & pp, const int worker_id );
 int decompress( int num_workers, const int infd, const int outfd,
                 const Pretty_print & pp, const int debug_level,
-                const bool infd_isreg );
+                const bool ignore_garbage, const bool infd_isreg );
 
 // defined in main.cc
 extern int verbosity;
@@ -214,9 +223,9 @@ class Slot_tally
 public:
   explicit Slot_tally( const int slots )
     : num_slots( slots ), num_free( slots )
-    { xinit( &mutex ); xinit( &slot_av ); }
+    { xinit_mutex( &mutex ); xinit_cond( &slot_av ); }
 
-  ~Slot_tally() { xdestroy( &slot_av ); xdestroy( &mutex ); }
+  ~Slot_tally() { xdestroy_cond( &slot_av ); xdestroy_mutex( &mutex ); }
 
   bool all_free() { return ( num_free == num_slots ); }
 
diff --git a/main.cc b/main.cc
index a2c1287..676f7d8 100644
--- a/main.cc
+++ b/main.cc
@@ -1,6 +1,6 @@
 /*  Plzip - Parallel compressor compatible with lzip
     Copyright (C) 2009 Laszlo Ersek.
-    Copyright (C) 2009-2015 Antonio Diaz Diaz.
+    Copyright (C) 2009-2016 Antonio Diaz Diaz.
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -67,12 +67,13 @@
 #error "Environments where CHAR_BIT != 8 are not supported."
 #endif
 
+int verbosity = 0;
 
 namespace {
 
 const char * const Program_name = "Plzip";
 const char * const program_name = "plzip";
-const char * const program_year = "2015";
+const char * const program_year = "2016";
 const char * invocation_name = 0;
 
 struct { const char * from; const char * to; } const known_extensions[] = {
@@ -90,9 +91,6 @@ enum Mode { m_compress, m_decompress, m_test };
 
 std::string output_filename;
 int outfd = -1;
-const mode_t usr_rw = S_IRUSR | S_IWUSR;
-const mode_t all_rw = usr_rw | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
-mode_t outfd_mode = usr_rw;
 bool delete_output_on_interrupt = false;
 
 
@@ -103,15 +101,16 @@ void show_help( const long num_online )
   std::printf( "\nOptions:\n"
                "  -h, --help                     display this help and exit\n"
                "  -V, --version                  output version information and exit\n"
+               "  -a, --trailing-error           exit with error status if trailing data\n"
                "  -B, --data-size=<bytes>        set size of input data blocks [2x8=16 MiB]\n"
-               "  -c, --stdout                   send output to standard output\n"
+               "  -c, --stdout                   write to standard output, keep input files\n"
                "  -d, --decompress               decompress\n"
                "  -f, --force                    overwrite existing output files\n"
                "  -F, --recompress               force re-compression of compressed files\n"
                "  -k, --keep                     keep (don't delete) input files\n"
                "  -m, --match-length=<bytes>     set match length limit in bytes [36]\n"
                "  -n, --threads=<n>              set number of (de)compression threads [%ld]\n"
-               "  -o, --output=<file>            if reading stdin, place the output into <file>\n"
+               "  -o, --output=<file>            if reading standard input, write to <file>\n"
                "  -q, --quiet                    suppress all messages\n"
                "  -s, --dictionary-size=<bytes>  set dictionary size limit in bytes [8 MiB]\n"
                "  -t, --test                     test compressed file integrity\n"
@@ -123,13 +122,15 @@ void show_help( const long num_online )
     {
     std::printf( "  -D, --debug=<level>        (0-1) print debug statistics to stderr\n" );
     }
-  std::printf( "If no file names are given, plzip compresses or decompresses\n"
-               "from standard input to standard output.\n"
+  std::printf( "If no file names are given, or if a file is '-', plzip compresses or\n"
+               "decompresses from standard input to standard output.\n"
                "Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,\n"
                "Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...\n"
-               "The bidimensional parameter space of LZMA can't be mapped to a linear\n"
+               "Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2^12\n"
+               "to 2^29 bytes.\n"
+               "\nThe bidimensional parameter space of LZMA can't be mapped to a linear\n"
                "scale optimal for all files. If your files are large, very repetitive,\n"
-               "etc, you may need to use the --match-length and --dictionary-size\n"
+               "etc, you may need to use the --dictionary-size and --match-length\n"
                "options directly to achieve optimal performance.\n"
                "\nExit status: 0 for a normal exit, 1 for environmental problems (file\n"
                "not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or\n"
@@ -190,11 +191,9 @@ unsigned long long getnum( const char * const ptr,
   if( !errno && tail[0] )
     {
     const int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
-    int exponent = 0;
-    bool bad_multiplier = false;
+    int exponent = 0;				// 0 = bad multiplier
     switch( tail[0] )
       {
-      case ' ': break;
       case 'Y': exponent = 8; break;
       case 'Z': exponent = 7; break;
       case 'E': exponent = 6; break;
@@ -202,13 +201,10 @@ unsigned long long getnum( const char * const ptr,
       case 'T': exponent = 4; break;
       case 'G': exponent = 3; break;
       case 'M': exponent = 2; break;
-      case 'K': if( factor == 1024 ) exponent = 1; else bad_multiplier = true;
-                break;
-      case 'k': if( factor == 1000 ) exponent = 1; else bad_multiplier = true;
-                break;
-      default : bad_multiplier = true;
+      case 'K': if( factor == 1024 ) exponent = 1; break;
+      case 'k': if( factor == 1000 ) exponent = 1; break;
       }
-    if( bad_multiplier )
+    if( exponent <= 0 )
       {
       show_error( "Bad multiplier in numerical argument.", 0, true );
       std::exit( 1 );
@@ -238,7 +234,7 @@ int get_dict_size( const char * const arg )
     return ( 1 << bits );
   int dictionary_size = getnum( arg, LZ_min_dictionary_size(),
                                      LZ_max_dictionary_size() );
-  if( dictionary_size == 65535 ) ++dictionary_size;
+  if( dictionary_size == 65535 ) ++dictionary_size;	// no fast encoder
   return dictionary_size;
   }
 
@@ -283,7 +279,7 @@ int open_instream( const char * const name, struct stat * const in_statsp,
       const bool can_read = ( i == 0 &&
                               ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
                                 S_ISFIFO( mode ) || S_ISSOCK( mode ) ) );
-      const bool no_ofile = to_stdout || program_mode == m_test;
+      const bool no_ofile = ( to_stdout || program_mode == m_test );
       if( i != 0 || ( !S_ISREG( mode ) && ( !can_read || !no_ofile ) ) )
         {
         if( verbosity >= 0 )
@@ -326,13 +322,17 @@ void set_d_outname( const std::string & name, const int i )
   }
 
 
-bool open_outstream( const bool force )
+bool open_outstream( const bool force, const bool from_stdin )
   {
+  const mode_t usr_rw = S_IRUSR | S_IWUSR;
+  const mode_t all_rw = usr_rw | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+  const mode_t outfd_mode = from_stdin ? all_rw : usr_rw;
   int flags = O_CREAT | O_WRONLY | O_BINARY;
   if( force ) flags |= O_TRUNC; else flags |= O_EXCL;
 
   outfd = open( output_filename.c_str(), flags, outfd_mode );
-  if( outfd < 0 && verbosity >= 0 )
+  if( outfd >= 0 ) delete_output_on_interrupt = true;
+  else if( verbosity >= 0 )
     {
     if( errno == EEXIST )
       std::fprintf( stderr, "%s: Output file '%s' already exists, skipping.\n",
@@ -403,7 +403,11 @@ void close_and_set_permissions( const struct stat * const in_statsp )
           fchmod( outfd, mode & ~( S_ISUID | S_ISGID | S_ISVTX ) ) != 0 )
         warning = true;
     }
-  if( close( outfd ) != 0 ) cleanup_and_fail( 1 );
+  if( close( outfd ) != 0 )
+    {
+    show_error( "Error closing output file", errno );
+    cleanup_and_fail( 1 );
+    }
   outfd = -1;
   delete_output_on_interrupt = false;
   if( in_statsp )
@@ -435,24 +439,18 @@ void set_signals()
 } // end namespace
 
 
-int verbosity = 0;
-
-
 void show_error( const char * const msg, const int errcode, const bool help )
   {
-  if( verbosity >= 0 )
+  if( verbosity < 0 ) return;
+  if( msg && msg[0] )
     {
-    if( msg && msg[0] )
-      {
-      std::fprintf( stderr, "%s: %s", program_name, msg );
-      if( errcode > 0 )
-        std::fprintf( stderr, ": %s", std::strerror( errcode ) );
-      std::fputc( '\n', stderr );
-      }
-    if( help )
-      std::fprintf( stderr, "Try '%s --help' for more information.\n",
-                    invocation_name );
+    std::fprintf( stderr, "%s: %s", program_name, msg );
+    if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
+    std::fputc( '\n', stderr );
     }
+  if( help )
+    std::fprintf( stderr, "Try '%s --help' for more information.\n",
+                  invocation_name );
   }
 
 
@@ -473,20 +471,18 @@ void show_progress( const int packet_size,
   static const Pretty_print * pp = 0;
   static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 
-  if( verbosity >= 2 )
+  if( verbosity < 2 ) return;
+  if( p )					// initialize static vars
+    { csize = cfile_size; pos = 0; pp = p; }
+  if( pp )
     {
-    if( p )					// initialize static vars
-      { csize = cfile_size; pos = 0; pp = p; }
-    if( pp )
-      {
-      xlock( &mutex );
-      pos += packet_size;
-      if( csize > 0 )
-        std::fprintf( stderr, "%4llu%%", pos / csize );
-      std::fprintf( stderr, "  %.1f MB\r", pos / 1000000.0 );
-      pp->reset(); (*pp)();			// restore cursor position
-      xunlock( &mutex );
-      }
+    xlock( &mutex );
+    pos += packet_size;
+    if( csize > 0 )
+      std::fprintf( stderr, "%4llu%%", pos / csize );
+    std::fprintf( stderr, "  %.1f MB\r", pos / 1000000.0 );
+    pp->reset(); (*pp)();			// restore cursor position
+    xunlock( &mutex );
     }
   }
 
@@ -497,7 +493,7 @@ int main( const int argc, const char * const argv[] )
      to the corresponding LZMA compression modes. */
   const Lzma_options option_mapping[] =
     {
-    {   65535,  16 },		// -0
+    {   65535,  16 },		// -0 (65535,16 chooses fast encoder)
     { 1 << 20,   5 },		// -1
     { 3 << 19,   6 },		// -2
     { 1 << 21,   8 },		// -3
@@ -517,13 +513,15 @@ int main( const int argc, const char * const argv[] )
   int num_workers = 0;		// start this many worker threads
   Mode program_mode = m_compress;
   bool force = false;
+  bool ignore_trailing = true;
   bool keep_input_files = false;
   bool recompress = false;
   bool to_stdout = false;
   invocation_name = argv[0];
 
-  if( LZ_version()[0] != LZ_version_string[0] )
-    internal_error( "bad library version." );
+  if( LZ_version()[0] < '1' )
+    { show_error( "Bad library version. At least lzlib 1.0 is required." );
+      return 1; }
 
   const long num_online = std::max( 1L, sysconf( _SC_NPROCESSORS_ONLN ) );
   long max_workers = sysconf( _SC_THREAD_THREADS_MAX );
@@ -542,6 +540,7 @@ int main( const int argc, const char * const argv[] )
     { '7',  0,                Arg_parser::no  },
     { '8',  0,                Arg_parser::no  },
     { '9', "best",            Arg_parser::no  },
+    { 'a', "trailing-error",  Arg_parser::no  },
     { 'b', "member-size",     Arg_parser::yes },
     { 'B', "data-size",       Arg_parser::yes },
     { 'c', "stdout",          Arg_parser::no  },
@@ -572,28 +571,30 @@ int main( const int argc, const char * const argv[] )
     const int code = parser.code( argind );
     if( !code ) break;					// no more options
     const std::string & arg = parser.argument( argind );
+    const char * const ptr = arg.c_str();
     switch( code )
       {
       case '0': case '1': case '2': case '3': case '4':
       case '5': case '6': case '7': case '8': case '9':
                 encoder_options = option_mapping[code-'0']; break;
+      case 'a': ignore_trailing = false; break;
       case 'b': break;
-      case 'B': data_size = getnum( arg.c_str(), 2 * LZ_min_dictionary_size(),
+      case 'B': data_size = getnum( ptr, 2 * LZ_min_dictionary_size(),
                                     2 * LZ_max_dictionary_size() ); break;
       case 'c': to_stdout = true; break;
       case 'd': program_mode = m_decompress; break;
-      case 'D': debug_level = getnum( arg.c_str(), 0, 3 ); break;
+      case 'D': debug_level = getnum( ptr, 0, 3 ); break;
       case 'f': force = true; break;
       case 'F': recompress = true; break;
       case 'h': show_help( num_online ); return 0;
       case 'k': keep_input_files = true; break;
       case 'm': encoder_options.match_len_limit =
-                  getnum( arg.c_str(), LZ_min_match_len_limit(),
-                                       LZ_max_match_len_limit() ); break;
-      case 'n': num_workers = getnum( arg.c_str(), 1, max_workers ); break;
+                  getnum( ptr, LZ_min_match_len_limit(),
+                               LZ_max_match_len_limit() ); break;
+      case 'n': num_workers = getnum( ptr, 1, max_workers ); break;
       case 'o': default_output_filename = arg; break;
       case 'q': verbosity = -1; break;
-      case 's': encoder_options.dictionary_size = get_dict_size( arg.c_str() );
+      case 's': encoder_options.dictionary_size = get_dict_size( ptr );
                 break;
       case 'S': break;
       case 't': program_mode = m_test; break;
@@ -637,9 +638,10 @@ int main( const int argc, const char * const argv[] )
       ( filenames_given || default_output_filename.size() ) )
     set_signals();
 
-  Pretty_print pp( filenames );
+  Pretty_print pp( filenames, verbosity );
 
   int retval = 0;
+  bool stdin_used = false;
   for( unsigned i = 0; i < filenames.size(); ++i )
     {
     struct stat in_stats;
@@ -647,6 +649,7 @@ int main( const int argc, const char * const argv[] )
 
     if( filenames[i].empty() || filenames[i] == "-" )
       {
+      if( stdin_used ) continue; else stdin_used = true;
       input_filename.clear();
       infd = STDIN_FILENO;
       if( program_mode != m_test )
@@ -658,8 +661,7 @@ int main( const int argc, const char * const argv[] )
           if( program_mode == m_compress )
             set_c_outname( default_output_filename );
           else output_filename = default_output_filename;
-          outfd_mode = all_rw;
-          if( !open_outstream( force ) )
+          if( !open_outstream( force, true ) )
             {
             if( retval < 1 ) retval = 1;
             close( infd ); infd = -1;
@@ -683,8 +685,7 @@ int main( const int argc, const char * const argv[] )
           if( program_mode == m_compress )
             set_c_outname( input_filename );
           else set_d_outname( input_filename, eindex );
-          outfd_mode = usr_rw;
-          if( !open_outstream( force ) )
+          if( !open_outstream( force, false ) )
             {
             if( retval < 1 ) retval = 1;
             close( infd ); infd = -1;
@@ -694,10 +695,12 @@ int main( const int argc, const char * const argv[] )
         }
       }
 
-    if( !check_tty( infd, program_mode ) ) return 1;
+    if( !check_tty( infd, program_mode ) )
+      {
+      if( retval < 1 ) retval = 1;
+      cleanup_and_fail( retval );
+      }
 
-    if( output_filename.size() && !to_stdout && program_mode != m_test )
-      delete_output_on_interrupt = true;
     const struct stat * const in_statsp = input_filename.size() ? &in_stats : 0;
     const bool infd_isreg = in_statsp && S_ISREG( in_statsp->st_mode );
     pp.set_name( input_filename );
@@ -711,7 +714,8 @@ int main( const int argc, const char * const argv[] )
                       num_workers, infd, outfd, pp, debug_level );
       }
     else
-      tmp = decompress( num_workers, infd, outfd, pp, debug_level, infd_isreg );
+      tmp = decompress( num_workers, infd, outfd, pp, debug_level,
+                        ignore_trailing, infd_isreg );
     if( tmp > retval ) retval = tmp;
     if( tmp && program_mode != m_test ) cleanup_and_fail( retval );
 
diff --git a/testsuite/check.sh b/testsuite/check.sh
index b054bf1..51f9e41 100755
--- a/testsuite/check.sh
+++ b/testsuite/check.sh
@@ -1,6 +1,6 @@
 #! /bin/sh
 # check script for Plzip - Parallel compressor compatible with lzip
-# Copyright (C) 2009-2015 Antonio Diaz Diaz.
+# Copyright (C) 2009-2016 Antonio Diaz Diaz.
 #
 # This script is free software: you have unlimited permission
 # to copy, distribute and modify it.
@@ -17,9 +17,16 @@ if [ ! -f "${LZIP}" ] || [ ! -x "${LZIP}" ] ; then
 	exit 1
 fi
 
+if [ -e "${LZIP}" ] 2> /dev/null ; then true
+else
+	echo "$0: a POSIX shell is required to run the tests"
+	echo "Try bash -c \"$0 $1 $2\""
+	exit 1
+fi
+
 if [ -d tmp ] ; then rm -rf tmp ; fi
 mkdir tmp
-cd "${objdir}"/tmp
+cd "${objdir}"/tmp || framework_failure
 
 cat "${testdir}"/test.txt > in || framework_failure
 in_lz="${testdir}"/test.txt.lz
@@ -27,25 +34,22 @@ fail=0
 
 printf "testing plzip-%s..." "$2"
 
-"${LZIP}" -cqm4 in > /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cqm274 in > /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cqs-1 in > /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cqs0 in > /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cqs4095 in > /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cqs513MiB in > /dev/null
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-printf "  in: Bad magic number (file not in lzip format).\n" > msg
-"${LZIP}" -t in 2> out
-if [ $? = 2 ] && cmp out msg ; then printf . ; else printf - ; fail=1 ; fi
-printf "  (stdin): Bad magic number (file not in lzip format).\n" > msg
-"${LZIP}" -t < in 2> out
-if [ $? = 2 ] && cmp out msg ; then printf . ; else printf - ; fail=1 ; fi
-rm -f out msg
+"${LZIP}" -fkqm4 in
+if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -fkqm274 in
+if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -fkqs-1 in
+if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -fkqs0 in
+if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -fkqs4095 in
+if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -fkqs513MiB in
+if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -tq in
+if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -tq < in
+if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${LZIP}" -cdq in
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${LZIP}" -cdq < in
@@ -55,26 +59,53 @@ if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 dd if="${in_lz}" bs=1 count=20 2> /dev/null | "${LZIP}" -tq
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 
-"${LZIP}" -t "${in_lz}" || fail=1
+printf "\ntesting decompression..."
+
+"${LZIP}" -t "${in_lz}"
+if [ $? = 0 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${LZIP}" -cd "${in_lz}" > copy || fail=1
 cmp in copy || fail=1
 printf .
 
+rm -f copy
 cat "${in_lz}" > copy.lz || framework_failure
-printf "to be overwritten" > copy || framework_failure
-"${LZIP}" -df copy.lz || fail=1
+"${LZIP}" -dk copy.lz || fail=1
 cmp in copy || fail=1
-printf .
+printf "to be overwritten" > copy || framework_failure
+"${LZIP}" -dq copy.lz
+if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -df copy.lz
+if [ $? = 0 ] && [ ! -e copy.lz ] && cmp in copy ; then
+	printf . ; else printf - ; fail=1 ; fi
 
 printf "to be overwritten" > copy || framework_failure
 "${LZIP}" -df -o copy < "${in_lz}" || fail=1
 cmp in copy || fail=1
 printf .
 
+rm -f copy
 "${LZIP}" < in > anyothername || fail=1
-"${LZIP}" -d anyothername || fail=1
-cmp in anyothername.out || fail=1
-printf .
+"${LZIP}" -d -o copy - anyothername - < "${in_lz}"
+if [ $? = 0 ] && cmp in copy && cmp in anyothername.out ; then
+	printf . ; else printf - ; fail=1 ; fi
+rm -f copy anyothername.out
+
+"${LZIP}" -tq in "${in_lz}"
+if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -tq foo.lz "${in_lz}"
+if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -cdq in "${in_lz}" > copy
+if [ $? = 2 ] && cat copy in | cmp in - ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -cdq foo.lz "${in_lz}" > copy
+if [ $? = 1 ] && cmp in copy ; then printf . ; else printf - ; fail=1 ; fi
+rm -f copy
+cat "${in_lz}" > copy.lz || framework_failure
+"${LZIP}" -dq in copy.lz
+if [ $? = 2 ] && [ -e copy.lz ] && [ ! -e copy ] && [ ! -e in.out ] ; then
+	printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -dq foo.lz copy.lz
+if [ $? = 1 ] && [ ! -e copy.lz ] && [ ! -e foo ] && cmp in copy ; then
+	printf . ; else printf - ; fail=1 ; fi
 
 cat in in > in2 || framework_failure
 "${LZIP}" -o copy2 < in2 || fail=1
@@ -84,12 +115,23 @@ cmp in2 copy2 || fail=1
 printf .
 
 printf "garbage" >> copy2.lz || framework_failure
+rm -f copy2
+"${LZIP}" -atq copy2.lz
+if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -atq < copy2.lz
+if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -adkq copy2.lz
+if [ $? = 2 ] && [ ! -e copy2 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -adkq -o copy2 < copy2.lz
+if [ $? = 2 ] && [ ! -e copy2 ] ; then printf . ; else printf - ; fail=1 ; fi
 printf "to be overwritten" > copy2 || framework_failure
 "${LZIP}" -df copy2.lz || fail=1
 cmp in2 copy2 || fail=1
 printf .
 
-"${LZIP}" -cfq "${in_lz}" > out
+printf "\ntesting   compression..."
+
+"${LZIP}" -cfq "${in_lz}" > out			# /dev/null is a tty on OS/2
 if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${LZIP}" -cF "${in_lz}" > out || fail=1
 "${LZIP}" -cd out | "${LZIP}" -d > copy || fail=1
@@ -162,10 +204,10 @@ printf .
 dd if="${in_lz}" bs=1024 count=6 > trunc.lz 2> /dev/null || framework_failure
 "${LZIP}" -tq trunc.lz
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cdq trunc.lz > out
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${LZIP}" -tq < trunc.lz
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+"${LZIP}" -cdq trunc.lz > out
+if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
 "${LZIP}" -dq < trunc.lz > out
 if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi