Merging upstream version 1.3~pre1.

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

17 files changed, 387 insertions, 259 deletions

diff --git a/ChangeLog b/ChangeLog
index d51671b..9ac5370 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2014-11-25  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.3-pre1 released.
+	* dec_stream.cc: Do not 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.
+	* Makefile.in: Added new targets 'install*-compress'.
+
 2014-08-29  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.2 released.
diff --git a/INSTALL b/INSTALL
index 14484b1..882204a 100644
--- a/INSTALL
+++ b/INSTALL
@@ -34,6 +34,10 @@ the main archive.
 5. Type 'make install' to install the program and any data files and
    documentation.
 
+   Or type 'make install-compress', which additionally compresses the
+   info manual and the man page after installation. (Installing
+   compressed docs may become the default in the future).
+
    You can install only the program, the info manual or the man page by
    typing 'make install-bin', 'make install-info' or 'make install-man'
    respectively.
diff --git a/Makefile.in b/Makefile.in
index 53543db..542a989 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -11,7 +11,9 @@ objs = arg_parser.o file_index.o compress.o dec_stdout.o dec_stream.o \
        decompress.o main.o
 
 
-.PHONY : all install install-bin install-info install-man install-strip \
+.PHONY : all install install-bin install-info install-man \
+         install-strip install-compress install-strip-compress \
+         install-bin-strip install-info-compress install-man-compress \
          install-as-lzip uninstall uninstall-bin uninstall-info uninstall-man \
          doc info man check dist clean distclean
 
@@ -20,9 +22,6 @@ all : $(progname)
 $(progname) : $(objs)
 	$(CXX) $(CXXFLAGS) $(LDFLAGS) -o $@ $(objs) $(LIBS)
 
-$(progname)_profiled : $(objs)
-	$(CXX) $(CXXFLAGS) $(LDFLAGS) -pg -o $@ $(objs) $(LIBS)
-
 main.o : main.cc
 	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -DPROGVERSION=\"$(pkgversion)\" -c -o $@ $<
 
@@ -58,38 +57,49 @@ check : all
 	@$(VPATH)/testsuite/check.sh $(VPATH)/testsuite $(pkgversion)
 
 install : install-bin install-info install-man
+install-strip : install-bin-strip install-info install-man
+install-compress : install-bin install-info-compress install-man-compress
+install-strip-compress : install-bin-strip install-info-compress install-man-compress
 
 install-bin : all
 	if [ ! -d "$(DESTDIR)$(bindir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(bindir)" ; fi
 	$(INSTALL_PROGRAM) ./$(progname) "$(DESTDIR)$(bindir)/$(progname)"
 
+install-bin-strip : all
+	$(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install-bin
+
 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"
 
+install-info-compress : install-info
+	lzip -v -9 "$(DESTDIR)$(infodir)/$(pkgname).info"
+
 install-man :
 	if [ ! -d "$(DESTDIR)$(mandir)/man1" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1" ; fi
+	-rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"*
 	$(INSTALL_DATA) $(VPATH)/doc/$(progname).1 "$(DESTDIR)$(mandir)/man1/$(progname).1"
 
-install-strip : all
-	$(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install
+install-man-compress : install-man
+	lzip -v -9 "$(DESTDIR)$(mandir)/man1/$(progname).1"
 
 install-as-lzip : install
 	-rm -f "$(DESTDIR)$(bindir)/lzip"
 	cd "$(DESTDIR)$(bindir)" && ln -s $(progname) lzip
 
-uninstall : uninstall-bin uninstall-info uninstall-man
+uninstall : uninstall-man uninstall-info uninstall-bin
 
 uninstall-bin :
 	-rm -f "$(DESTDIR)$(bindir)/$(progname)"
 
 uninstall-info :
 	-install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info"
-	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"
+	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 
 uninstall-man :
-	-rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"
+	-rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"*
 
 dist : doc
 	ln -sf $(VPATH) $(DISTNAME)
@@ -114,7 +124,7 @@ dist : doc
 	lzip -v -9 $(DISTNAME).tar
 
 clean :
-	-rm -f $(progname) $(progname)_profiled $(objs)
+	-rm -f $(progname) $(objs)
 
 distclean : clean
 	-rm -f Makefile config.status *.tar *.tar.lz
diff --git a/NEWS b/NEWS
index 00348a1..9e04ba7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,16 +1,14 @@
-Changes in version 1.2:
+Changes in version 1.3:
 
-Copying of file dates, permissions, and ownership now behaves like "cp -p".
-(If the user ID or the group ID can't be duplicated, the file permission
-bits S_ISUID and S_ISGID are cleared).
+Testing of a non-seekable file or of standard input now uses up to 30
+MiB less memory per thread.
 
-Individual limits have been set on the number of packets produced by
-each decompresor worker thread to limit the amount of memory used in all
-cases.
+"-dvvv" and "-tvvv" now show the dictionary size of the first member,
+producing the same output as lzip for single-member files.
 
-The approximate amount of memory required has been documented in the
-manual.
+Chapters "Memory requirements" and "Minimum file sizes" have been added
+to the manual.
 
-"plzip.texinfo" has been renamed to "plzip.texi".
-
-The license has been changed to GPL version 2 or later.
+The targets "install-compress", "install-strip-compress",
+"install-info-compress" and "install-man-compress" have been added to
+the Makefile.
diff --git a/README b/README
index da5b9d1..de76ecd 100644
--- a/README
+++ b/README
@@ -23,8 +23,9 @@ decompressed in parallel.
 Plzip uses the lzip file format; the files produced by plzip are fully
 compatible with lzip-1.4 or newer, and can be rescued with lziprecover.
 
-The lzip file format is designed for long-term data archiving, taking
-into account both data integrity and decoder availability:
+The lzip file format is designed for data sharing and long-term
+archiving, taking into account both data integrity and decoder
+availability:
 
    * The lzip format provides very safe integrity checking and some data
      recovery means. The lziprecover program can repair bit-flip errors
@@ -39,8 +40,8 @@ into account both data integrity and decoder availability:
      extract the data from a lzip file long after quantum computers
      eventually render LZMA obsolete.
 
-   * Additionally lzip is copylefted, which guarantees that it will
-     remain free forever.
+   * Additionally the lzip reference implementation is copylefted, which
+     guarantees that it will remain free forever.
 
 A nice feature of the lzip format is that a corrupt byte is easier to
 repair the nearer it is from the beginning of the file. Therefore, with
diff --git a/compress.cc b/compress.cc
index d47d4c9..74f8aa1 100644
--- a/compress.cc
+++ b/compress.cc
@@ -156,9 +156,11 @@ const char * const mem_msg = "Not enough memory. Try a smaller dictionary size";
 
 struct Packet			// data block with a serial number
   {
-  unsigned id;			// serial number assigned as received
   uint8_t * data;
   int size;			// number of bytes in data (if any)
+  unsigned id;			// serial number assigned as received
+  Packet( uint8_t * const d, const int s, const unsigned i )
+    : data( d ), size( s ), id( i ) {}
   };
 
 
@@ -207,10 +209,7 @@ public:
   // make a packet with data received from splitter
   void receive_packet( uint8_t * const data, const int size )
     {
-    Packet * const ipacket = new Packet;
-    ipacket->id = receive_id++;
-    ipacket->data = data;
-    ipacket->size = size;
+    Packet * const ipacket = new Packet( data, size, receive_id++ );
     slot_tally.get_slot();		// wait for a free slot
     xlock( &imutex );
     packet_queue.push( ipacket );
@@ -310,6 +309,7 @@ struct Splitter_arg
   const Pretty_print * pp;
   int infd;
   int data_size;
+  int offset;
   };
 
 
@@ -322,12 +322,13 @@ extern "C" void * csplitter( void * arg )
   const Pretty_print & pp = *tmp.pp;
   const int infd = tmp.infd;
   const int data_size = tmp.data_size;
+  const int offset = tmp.offset;
 
   for( bool first_post = true; ; first_post = false )
     {
-    uint8_t * const data = new( std::nothrow ) uint8_t[data_size];
+    uint8_t * const data = new( std::nothrow ) uint8_t[offset+data_size];
     if( !data ) { pp( mem_msg ); cleanup_and_fail(); }
-    const int size = readblock( infd, data, data_size );
+    const int size = readblock( infd, data + offset, data_size );
     if( size != data_size && errno )
       { pp(); show_error( "Read error", errno ); cleanup_and_fail(); }
 
@@ -354,6 +355,7 @@ struct Worker_arg
   const Pretty_print * pp;
   int dictionary_size;
   int match_len_limit;
+  int offset;
   };
 
 
@@ -366,15 +368,13 @@ extern "C" void * cworker( void * arg )
   const Pretty_print & pp = *tmp.pp;
   const int dictionary_size = tmp.dictionary_size;
   const int match_len_limit = tmp.match_len_limit;
+  const int offset = tmp.offset;
 
   while( true )
     {
     Packet * const packet = courier.distribute_packet();
     if( !packet ) break;		// no more packets to process
 
-    const int max_compr_size = 42 + packet->size + ( ( packet->size + 7 ) / 8 );
-    uint8_t * const new_data = new( std::nothrow ) uint8_t[max_compr_size];
-    if( !new_data ) { pp( mem_msg ); cleanup_and_fail(); }
     const int dict_size = std::max( LZ_min_dictionary_size(),
                                     std::min( dictionary_size, packet->size ) );
     LZ_Encoder * const encoder =
@@ -396,16 +396,16 @@ extern "C" void * cworker( void * arg )
         {
         if( written < packet->size )
           {
-          const int wr = LZ_compress_write( encoder, packet->data + written,
+          const int wr = LZ_compress_write( encoder,
+                                            packet->data + offset + written,
                                             packet->size - written );
           if( wr < 0 ) internal_error( "library error (LZ_compress_write)" );
           written += wr;
           }
-        if( written >= packet->size )
-          { delete[] packet->data; LZ_compress_finish( encoder ); }
+        if( written >= packet->size ) LZ_compress_finish( encoder );
         }
-      const int rd = LZ_compress_read( encoder, new_data + new_pos,
-                                       max_compr_size - new_pos );
+      const int rd = LZ_compress_read( encoder, packet->data + new_pos,
+                                       offset + written - new_pos );
       if( rd < 0 )
         {
         pp();
@@ -415,7 +415,7 @@ extern "C" void * cworker( void * arg )
         cleanup_and_fail();
         }
       new_pos += rd;
-      if( new_pos > max_compr_size )
+      if( new_pos >= offset + written )
         internal_error( "packet size exceeded in worker" );
       if( LZ_compress_finished( encoder ) == 1 ) break;
       }
@@ -423,8 +423,7 @@ extern "C" void * cworker( void * arg )
     if( LZ_compress_close( encoder ) < 0 )
       { pp( "LZ_compress_close failed." ); cleanup_and_fail(); }
 
-    if( verbosity >= 2 && packet->size > 0 ) show_progress( packet->size );
-    packet->data = new_data;
+    if( packet->size > 0 ) show_progress( packet->size );
     packet->size = new_pos;
     courier.collect_packet( packet );
     }
@@ -447,12 +446,9 @@ void muxer( Packet_courier & courier, const Pretty_print & pp, const int outfd )
       const Packet * const opacket = packet_vector[i];
       out_size += opacket->size;
 
-      if( outfd >= 0 )
-        {
-        const int wr = writeblock( outfd, opacket->data, opacket->size );
-        if( wr != opacket->size )
-          { pp(); show_error( "Write error", errno ); cleanup_and_fail(); }
-        }
+      const int wr = writeblock( outfd, opacket->data, opacket->size );
+      if( wr != opacket->size )
+        { pp(); show_error( "Write error", errno ); cleanup_and_fail(); }
       delete[] opacket->data;
       delete opacket;
       }
@@ -469,6 +465,7 @@ int compress( const int data_size, const int dictionary_size,
               const int infd, const int outfd,
               const Pretty_print & pp, const int debug_level )
   {
+  const int offset = data_size / 8;
   const int slots_per_worker = 2;
   const int num_slots =
     ( ( num_workers > 1 ) ? num_workers * slots_per_worker : 1 );
@@ -481,6 +478,7 @@ int compress( const int data_size, const int dictionary_size,
   splitter_arg.pp = &pp;
   splitter_arg.infd = infd;
   splitter_arg.data_size = data_size;
+  splitter_arg.offset = offset;
 
   pthread_t splitter_thread;
   int errcode = pthread_create( &splitter_thread, 0, csplitter, &splitter_arg );
@@ -492,6 +490,7 @@ int compress( const int data_size, const int dictionary_size,
   worker_arg.pp = &pp;
   worker_arg.dictionary_size = dictionary_size;
   worker_arg.match_len_limit = match_len_limit;
+  worker_arg.offset = offset;
 
   pthread_t * worker_threads = new( std::nothrow ) pthread_t[num_workers];
   if( !worker_threads ) { pp( mem_msg ); cleanup_and_fail(); }
diff --git a/configure b/configure
index 6eaede2..0a59b2f 100755
--- a/configure
+++ b/configure
@@ -6,7 +6,7 @@
 # to copy, distribute and modify it.
 
 pkgname=plzip
-pkgversion=1.2
+pkgversion=1.3-pre1
 progname=plzip
 srctrigger=doc/${pkgname}.texi
 
diff --git a/dec_stdout.cc b/dec_stdout.cc
index 7c5e51b..7af6b0d 100644
--- a/dec_stdout.cc
+++ b/dec_stdout.cc
@@ -46,6 +46,8 @@ struct Packet			// data block
   {
   uint8_t * data;		// data == 0 means end of member
   int size;			// number of bytes in data (if any)
+  explicit Packet( uint8_t * const d = 0, const int s = 0 )
+    : data( d ), size( s ) {}
   };
 
 
@@ -211,21 +213,16 @@ extern "C" void * dworker_o( void * arg )
           {
           if( new_pos > 0 )			// make data packet
             {
-            Packet * opacket = new Packet;
-            opacket->data = new_data;
-            opacket->size = new_pos;
+            Packet * const opacket = new Packet( new_data, new_pos );
             courier.collect_packet( opacket, worker_id );
             new_pos = 0;
             new_data = new( std::nothrow ) uint8_t[max_packet_size];
             if( !new_data ) { pp( "Not enough memory." ); cleanup_and_fail(); }
             }
           if( LZ_decompress_finished( decoder ) == 1 )
-            {
+            {					// end of member token
+            courier.collect_packet( new Packet, worker_id );
             LZ_decompress_reset( decoder );	// prepare for new member
-            Packet * opacket = new Packet;	// end of member token
-            opacket->data = 0;
-            opacket->size = 0;
-            courier.collect_packet( opacket, worker_id );
             break;
             }
           }
@@ -250,15 +247,12 @@ void muxer( Packet_courier & courier, const Pretty_print & pp, const int outfd )
   {
   while( true )
     {
-    Packet * opacket = courier.deliver_packet();
+    Packet * const opacket = courier.deliver_packet();
     if( !opacket ) break;	// queue is empty. all workers exited
 
-    if( outfd >= 0 )
-      {
-      const int wr = writeblock( outfd, opacket->data, opacket->size );
-      if( wr != opacket->size )
-        { pp(); show_error( "Write error", errno ); cleanup_and_fail(); }
-      }
+    const int wr = writeblock( outfd, opacket->data, opacket->size );
+    if( wr != opacket->size )
+      { pp(); show_error( "Write error", errno ); cleanup_and_fail(); }
     delete[] opacket->data;
     delete opacket;
     }
@@ -311,7 +305,7 @@ int dec_stdout( const int num_workers, const int infd, const int outfd,
                   (double)out_size / in_size,
                   ( 8.0 * in_size ) / out_size,
                   100.0 * ( 1.0 - ( (double)in_size / out_size ) ) );
-  if( verbosity >= 3 )
+  if( verbosity >= 4 )
     std::fprintf( stderr, "decompressed size %9llu, size %9llu.  ",
                   out_size, in_size );
 
diff --git a/dec_stream.cc b/dec_stream.cc
index f22f790..64eaa30 100644
--- a/dec_stream.cc
+++ b/dec_stream.cc
@@ -47,6 +47,8 @@ struct Packet			// data block
   {
   uint8_t * data;		// data == 0 means end of member
   int size;			// number of bytes in data (if any)
+  explicit Packet( uint8_t * const d = 0, const int s = 0 )
+    : data( d ), size( s ) {}
   };
 
 
@@ -102,9 +104,7 @@ public:
   // if data == 0, move to next queue
   void receive_packet( uint8_t * const data, const int size )
     {
-    Packet * ipacket = new Packet;
-    ipacket->data = data;
-    ipacket->size = size;
+    Packet * const ipacket = new Packet( data, size );
     if( data )
       { in_size += size; slot_tally.get_slot(); }  // wait for a free slot
     xlock( &imutex );
@@ -185,6 +185,13 @@ public:
     return opacket;
     }
 
+  void add_out_size( const unsigned long long partial_out_size )
+    {
+    xlock( &omutex );
+    out_size += partial_out_size;
+    xunlock( &omutex );
+    }
+
   void finish()			// splitter has no more packets to send
     {
     xlock( &imutex );
@@ -269,6 +276,7 @@ extern "C" void * dsplitter_s( void * arg )
                       header.version() ); }
     cleanup_and_fail( 2 );
     }
+  show_header( header.dictionary_size() );
 
   unsigned long long partial_member_size = 0;
   while( true )
@@ -337,22 +345,25 @@ struct Worker_arg
   Packet_courier * courier;
   const Pretty_print * pp;
   int worker_id;
+  bool testing;
   };
 
 
-       // consume packets from courier, decompress their contents, and
-       // give the produced packets to courier.
+       // consume packets from courier, decompress their contents and,
+       // if not testing, give the produced packets to courier.
 extern "C" void * dworker_s( void * arg )
   {
   const Worker_arg & tmp = *(Worker_arg *)arg;
   Packet_courier & courier = *tmp.courier;
   const Pretty_print & pp = *tmp.pp;
   const int worker_id = tmp.worker_id;
+  const bool testing = tmp.testing;
 
   uint8_t * new_data = new( std::nothrow ) uint8_t[max_packet_size];
   LZ_Decoder * const decoder = LZ_decompress_open();
   if( !new_data || !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
     { pp( "Not enough memory." ); cleanup_and_fail(); }
+  unsigned long long partial_out_size = 0;
   int new_pos = 0;
   bool trailing_garbage_found = false;
 
@@ -391,24 +402,21 @@ extern "C" void * dworker_s( void * arg )
         if( new_pos == max_packet_size || trailing_garbage_found ||
             LZ_decompress_finished( decoder ) == 1 )
           {
-          if( new_pos > 0 )			// make data packet
+          if( !testing && new_pos > 0 )		// make data packet
             {
-            Packet * opacket = new Packet;
-            opacket->data = new_data;
-            opacket->size = new_pos;
+            Packet * const opacket = new Packet( new_data, new_pos );
             courier.collect_packet( opacket, worker_id );
-            new_pos = 0;
             new_data = new( std::nothrow ) uint8_t[max_packet_size];
             if( !new_data ) { pp( "Not enough memory." ); cleanup_and_fail(); }
             }
+          partial_out_size += new_pos;
+          new_pos = 0;
           if( trailing_garbage_found ||
               LZ_decompress_finished( decoder ) == 1 )
             {
+            if( !testing )			// end of member token
+              courier.collect_packet( new Packet, worker_id );
             LZ_decompress_reset( decoder );	// prepare for new member
-            Packet * opacket = new Packet;	// end of member token
-            opacket->data = 0;
-            opacket->size = 0;
-            courier.collect_packet( opacket, worker_id );
             break;
             }
           }
@@ -421,6 +429,7 @@ extern "C" void * dworker_s( void * arg )
     }
 
   delete[] new_data;
+  courier.add_out_size( partial_out_size );
   if( LZ_decompress_member_position( decoder ) != 0 )
     { pp( "Error, some data remains in decoder." ); cleanup_and_fail(); }
   if( LZ_decompress_close( decoder ) < 0 )
@@ -435,17 +444,12 @@ void muxer( Packet_courier & courier, const Pretty_print & pp, const int outfd )
   {
   while( true )
     {
-    Packet * opacket = courier.deliver_packet();
+    Packet * const opacket = courier.deliver_packet();
     if( !opacket ) break;	// queue is empty. all workers exited
 
-    out_size += opacket->size;
-
-    if( outfd >= 0 )
-      {
-      const int wr = writeblock( outfd, opacket->data, opacket->size );
-      if( wr != opacket->size )
-        { pp(); show_error( "Write error", errno ); cleanup_and_fail(); }
-      }
+    const int wr = writeblock( outfd, opacket->data, opacket->size );
+    if( wr != opacket->size )
+      { pp(); show_error( "Write error", errno ); cleanup_and_fail(); }
     delete[] opacket->data;
     delete opacket;
     }
@@ -454,11 +458,10 @@ void muxer( Packet_courier & courier, const Pretty_print & pp, const int outfd )
 } // end namespace
 
 
-    // init the courier, then start the splitter and the workers and
-    // call the muxer.
+    // 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 bool testing )
+                const Pretty_print & pp, const int debug_level )
   {
   const int in_slots_per_worker = 2;
   const int out_slots = 32;
@@ -487,12 +490,13 @@ 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].testing = ( outfd < 0 );
     errcode = pthread_create( &worker_threads[i], 0, dworker_s, &worker_args[i] );
     if( errcode )
       { show_error( "Can't create worker threads", errcode ); cleanup_and_fail(); }
     }
 
-  muxer( courier, pp, outfd );
+  if( outfd >= 0 ) muxer( courier, pp, outfd );
 
   for( int i = num_workers - 1; i >= 0; --i )
     {
@@ -512,11 +516,11 @@ int dec_stream( const int num_workers, const int infd, const int outfd,
                   (double)out_size / in_size,
                   ( 8.0 * in_size ) / out_size,
                   100.0 * ( 1.0 - ( (double)in_size / out_size ) ) );
-  if( verbosity >= 3 )
+  if( verbosity >= 4 )
     std::fprintf( stderr, "decompressed size %9llu, size %9llu.  ",
                   out_size, in_size );
 
-  if( verbosity >= 1 ) std::fprintf( stderr, testing ? "ok\n" : "done\n" );
+  if( verbosity >= 1 ) std::fprintf( stderr, (outfd < 0) ? "ok\n" : "done\n" );
 
   if( debug_level & 1 )
     std::fprintf( stderr,
diff --git a/decompress.cc b/decompress.cc
index cdcc7af..6dc7afe 100644
--- a/decompress.cc
+++ b/decompress.cc
@@ -196,20 +196,21 @@ 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 testing, const bool infd_isreg )
+                const bool infd_isreg )
   {
   if( !infd_isreg )
-    return dec_stream( num_workers, infd, outfd, pp, debug_level, testing );
+    return dec_stream( num_workers, infd, outfd, pp, debug_level );
 
   const File_index file_index( infd );
   if( file_index.retval() == 1 )
     {
     lseek( infd, 0, SEEK_SET );
-    return dec_stream( num_workers, infd, outfd, pp, debug_level, testing );
+    return dec_stream( num_workers, infd, outfd, pp, debug_level );
     }
   if( file_index.retval() != 0 )
     { pp( file_index.error().c_str() ); return file_index.retval(); }
 
+  show_header( file_index.dictionary_size( 0 ) );
   if( num_workers > file_index.members() )
     num_workers = file_index.members();
 
@@ -255,11 +256,11 @@ int decompress( int num_workers, const int infd, const int outfd,
                   (double)out_size / in_size,
                   ( 8.0 * in_size ) / out_size,
                   100.0 * ( 1.0 - ( (double)in_size / out_size ) ) );
-  if( verbosity >= 3 )
+  if( verbosity >= 4 )
     std::fprintf( stderr, "decompressed size %9llu, size %9llu.  ",
                   out_size, in_size );
 
-  if( verbosity >= 1 ) std::fprintf( stderr, testing ? "ok\n" : "done\n" );
+  if( verbosity >= 1 ) std::fprintf( stderr, (outfd < 0) ? "ok\n" : "done\n" );
 
   return 0;
   }
diff --git a/doc/plzip.1 b/doc/plzip.1
index cab69f4..9146257 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" "August 2014" "plzip 1.2" "User Commands"
+.TH PLZIP "1" "November 2014" "plzip 1.3-pre1" "User Commands"
 .SH NAME
 plzip \- reduces the size of files
 .SH SYNOPSIS
@@ -70,8 +70,7 @@ Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...
 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
-options directly to achieve optimal performance. For example, \fB\-9m64\fR
-usually compresses executables more (and faster) than \fB\-9\fR.
+options directly to achieve optimal performance.
 .PP
 Exit status: 0 for a normal exit, 1 for environmental problems (file
 not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or
diff --git a/doc/plzip.info b/doc/plzip.info
index f8f7e08..2e64673 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 1.2, 29 August 2014).
+This manual is for Plzip (version 1.3-pre1, 25 November 2014).
 
 * Menu:
 
@@ -19,6 +19,8 @@ This manual is for Plzip (version 1.2, 29 August 2014).
 * Program design::         Internal structure of plzip
 * Invoking plzip::         Command line interface
 * 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
 * Problems::               Reporting bugs
 * Concept index::          Index of concepts
 
@@ -40,16 +42,18 @@ the one of lzip, bzip2 or gzip.
 
    Plzip can compress/decompress large files on multiprocessor machines
 much faster than lzip, at the cost of a slightly reduced compression
-ratio. Note that the number of usable threads is limited by file size;
-on files larger than a few GB plzip can use hundreds of processors, but
-on files of only a few MB plzip is no faster than lzip.
+ratio (0.4 to 2 percent larger compressed files). Note that the number
+of usable threads is limited by file size; on files larger than a few GB
+plzip can use hundreds of processors, but on files of only a few MB
+plzip is no faster than lzip (*note Minimum file sizes::).
 
    Plzip uses the lzip file format; the files produced by plzip are
 fully compatible with lzip-1.4 or newer, and can be rescued with
 lziprecover.
 
-   The lzip file format is designed for long-term data archiving, taking
-into account both data integrity and decoder availability:
+   The lzip file format is designed for data sharing and long-term
+archiving, taking into account both data integrity and decoder
+availability:
 
    * The lzip format provides very safe integrity checking and some data
      recovery means. The lziprecover program can repair bit-flip errors
@@ -64,50 +68,23 @@ into account both data integrity and decoder availability:
      archaeologist to extract the data from a lzip file long after
      quantum computers eventually render LZMA obsolete.
 
-   * Additionally lzip is copylefted, which guarantees that it will
-     remain free forever.
+   * Additionally the lzip reference implementation is copylefted, which
+     guarantees that it will remain free forever.
 
    A nice feature of the lzip format is that a corrupt byte is easier to
 repair the nearer it is from the beginning of the file. Therefore, with
 the help of lziprecover, losing an entire archive just because of a
 corrupt byte near the beginning is a thing of the past.
 
-   The member trailer stores the 32-bit CRC of the original data, the
-size of the original data and the size of the member. These values,
-together with the value remaining in the range decoder and the
-end-of-stream marker, provide a 4 factor integrity checking which
-guarantees that the decompressed version of the data is identical to
-the original. This guards against corruption of the compressed data,
-and against undetected bugs in plzip (hopefully very unlikely). The
-chances of data corruption going undetected are microscopic. Be aware,
-though, that the check occurs upon decompression, so it can only tell
-you that something is wrong. It can't help you recover the original
-uncompressed data.
-
    Plzip uses the same well-defined exit status values used by lzip and
 bzip2, which makes it safer than compressors returning ambiguous warning
 values (like gzip) when it is used as a back end for other programs like
 tar or zutils.
 
-   The amount of memory required *per thread* is approximately the
-following:
-
-   * For compression; 3 times the data size (*note --data-size::) plus
-     11 times the dictionary size.
-
-   * For decompression or testing of a non-seekable file or of standard
-     input; 2 times the dictionary size plus up to 32 MiB.
-
-   * For decompression of a regular file to a non-seekable file or to
-     standard output; the dictionary size plus up to 32 MiB.
-
-   * For decompression of a regular file to another regular file, or for
-     testing of a regular file; the dictionary size.
-
    Plzip will automatically use the smallest possible dictionary size
 for each file without exceeding the given limit. Keep in mind that the
 decompression memory requirement is affected at compression time by the
-choice of dictionary size limit.
+choice of dictionary size limit (*note Memory requirements::).
 
    When compressing, plzip replaces every file given in the command line
 with a compressed version of itself, with the name "original_name.lz".
@@ -245,8 +222,8 @@ The format for running plzip is:
      value.
 
      Note that the number of usable threads is limited to
-     ceil( file_size / data_size ) during compression (*note
-     --data-size::), and to the number of members in the input during
+     ceil( file_size / data_size ) during compression (*note Minimum
+     file sizes::), and to the number of members in the input during
      decompression.
 
 '-o FILE'
@@ -287,8 +264,8 @@ The format for running plzip is:
      When compressing, show the compression ratio for each file
      processed. A second '-v' shows the progress of compression.
      When decompressing or testing, further -v's (up to 4) increase the
-     verbosity level, showing status, compression ratio, decompressed
-     size, and compressed size.
+     verbosity level, showing status, compression ratio, dictionary
+     size, decompressed size, and compressed size.
 
 '-1 .. -9'
      Set the compression parameters (dictionary size and match length
@@ -299,8 +276,7 @@ The format for running plzip is:
      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. For example, '-9m64' usually compresses executables
-     more (and faster) than '-9'.
+     performance.
 
      Level   Dictionary size   Match length limit
      -1      1 MiB             5 bytes
@@ -340,7 +316,7 @@ invalid input file, 3 for an internal consistency error (eg, bug) which
 caused plzip to panic.
 
 
-File: plzip.info,  Node: File format,  Next: Problems,  Prev: Invoking plzip,  Up: Top
+File: plzip.info,  Node: File format,  Next: Memory requirements,  Prev: Invoking plzip,  Up: Top
 
 4 File format
 *************
@@ -413,9 +389,70 @@ additional information before, between, or after them.
 
 
 
-File: plzip.info,  Node: Problems,  Next: Concept index,  Prev: File format,  Up: Top
+File: plzip.info,  Node: Memory requirements,  Next: Minimum file sizes,  Prev: File format,  Up: Top
+
+5 Memory required to compress and decompress
+********************************************
+
+The amount of memory required *per thread* is approximately the
+following:
+
+   * For compression; 11 times the dictionary size plus 3 times the
+     data size (*note --data-size::).
+
+   * 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.
+
+   * For testing of a non-seekable file or of standard input; the
+     dictionary size plus up to 5 MiB.
+
+   * For decompression of a regular file to a non-seekable file or to
+     standard output; the dictionary size plus up to 32 MiB.
+
+   * For decompression of a non-seekable file or of standard input; the
+     dictionary size plus up to 35 MiB.
+
+
+File: plzip.info,  Node: Minimum file sizes,  Next: Problems,  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.
+
+   For this to work as expected (and roughly multiply the compression
+speed by the number of available processors), the uncompressed file
+must be at least as large as the number of worker threads times the
+chunk size (*note --data-size::). Else some processors will not get any
+data to compress, and compression will be proportionally slower. The
+maximum speed increase achievable on a given file is limited by the
+ratio (file_size / data_size).
+
+   The following table shows the minimum uncompressed file size needed
+for full use of N processors at a given compression level, using the
+default data size for each level:
+
+Processors   2         3         4         8         16        64
+------------------------------------------------------------------------- 
+Level                                                          
+-1           4 MiB     6 MiB     8 MiB     16 MiB    32 MiB    128 MiB
+-2           6 MiB     9 MiB     12 MiB    24 MiB    48 MiB    192 MiB
+-3           8 MiB     12 MiB    16 MiB    32 MiB    64 MiB    256 MiB
+-4           12 MiB    18 MiB    24 MiB    48 MiB    96 MiB    384 MiB
+-5           16 MiB    24 MiB    32 MiB    64 MiB    128 MiB   512 MiB
+-6           32 MiB    48 MiB    64 MiB    128 MiB   256 MiB   1 GiB
+-7           64 MiB    96 MiB    128 MiB   256 MiB   512 MiB   2 GiB
+-8           96 MiB    144 MiB   192 MiB   384 MiB   768 MiB   3 GiB
+-9           128 MiB   192 MiB   256 MiB   512 MiB   1 GiB     4 GiB
+
+
+File: plzip.info,  Node: Problems,  Next: Concept index,  Prev: Minimum file sizes,  Up: Top
 
-5 Reporting bugs
+7 Reporting bugs
 ****************
 
 There are probably bugs in plzip. There are certainly errors and
@@ -441,6 +478,8 @@ Concept index
 * getting help:                          Problems.              (line 6)
 * introduction:                          Introduction.          (line 6)
 * invoking:                              Invoking plzip.        (line 6)
+* memory requirements:                   Memory requirements.   (line 6)
+* minimum file sizes:                    Minimum file sizes.    (line 6)
 * options:                               Invoking plzip.        (line 6)
 * program design:                        Program design.        (line 6)
 * usage:                                 Invoking plzip.        (line 6)
@@ -450,13 +489,15 @@ Concept index
 
 Tag Table:
 Node: Top221
-Node: Introduction847
-Node: Program design6279
-Node: Invoking plzip7868
-Ref: --data-size8313
-Node: File format13471
-Node: Problems15976
-Node: Concept index16505
+Node: Introduction994
+Node: Program design5290
+Node: Invoking plzip6879
+Ref: --data-size7324
+Node: File format12420
+Node: Memory requirements14936
+Node: Minimum file sizes15913
+Node: Problems17765
+Node: Concept index18301
 
 End Tag Table
 
diff --git a/doc/plzip.texi b/doc/plzip.texi
index bc7af6d..c0cb0fd 100644
--- a/doc/plzip.texi
+++ b/doc/plzip.texi
@@ -6,8 +6,8 @@
 @finalout
 @c %**end of header
 
-@set UPDATED 29 August 2014
-@set VERSION 1.2
+@set UPDATED 25 November 2014
+@set VERSION 1.3-pre1
 
 @dircategory Data Compression
 @direntry
@@ -39,6 +39,8 @@ This manual is for Plzip (version @value{VERSION}, @value{UPDATED}).
 * Program design::         Internal structure of plzip
 * Invoking plzip::         Command line interface
 * 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
 * Problems::               Reporting bugs
 * Concept index::          Index of concepts
 @end menu
@@ -60,15 +62,17 @@ the one of lzip, bzip2 or gzip.
 
 Plzip can compress/decompress large files on multiprocessor machines
 much faster than lzip, at the cost of a slightly reduced compression
-ratio. Note that the number of usable threads is limited by file size;
-on files larger than a few GB plzip can use hundreds of processors, but
-on files of only a few MB plzip is no faster than lzip.
+ratio (0.4 to 2 percent larger compressed files). Note that the number
+of usable threads is limited by file size; on files larger than a few GB
+plzip can use hundreds of processors, but on files of only a few MB
+plzip is no faster than lzip (@pxref{Minimum file sizes}).
 
 Plzip uses the lzip file format; the files produced by plzip are fully
 compatible with lzip-1.4 or newer, and can be rescued with lziprecover.
 
-The lzip file format is designed for long-term data archiving, taking
-into account both data integrity and decoder availability:
+The lzip file format is designed for data sharing and long-term
+archiving, taking into account both data integrity and decoder
+availability:
 
 @itemize @bullet
 @item
@@ -87,8 +91,8 @@ data from a lzip file long after quantum computers eventually render
 LZMA obsolete.
 
 @item
-Additionally lzip is copylefted, which guarantees that it will remain
-free forever.
+Additionally the lzip reference implementation is copylefted, which
+guarantees that it will remain free forever.
 @end itemize
 
 A nice feature of the lzip format is that a corrupt byte is easier to
@@ -96,47 +100,15 @@ repair the nearer it is from the beginning of the file. Therefore, with
 the help of lziprecover, losing an entire archive just because of a
 corrupt byte near the beginning is a thing of the past.
 
-The member trailer stores the 32-bit CRC of the original data, the size
-of the original data and the size of the member. These values, together
-with the value remaining in the range decoder and the end-of-stream
-marker, provide a 4 factor integrity checking which guarantees that the
-decompressed version of the data is identical to the original. This
-guards against corruption of the compressed data, and against undetected
-bugs in plzip (hopefully very unlikely). The chances of data corruption
-going undetected are microscopic. Be aware, though, that the check
-occurs upon decompression, so it can only tell you that something is
-wrong. It can't help you recover the original uncompressed data.
-
 Plzip uses the same well-defined exit status values used by lzip and
 bzip2, which makes it safer than compressors returning ambiguous warning
 values (like gzip) when it is used as a back end for other programs like
 tar or zutils.
 
-The amount of memory required @strong{per thread} is approximately the
-following:
-
-@itemize @bullet
-@item
-For compression; 3 times the data size (@pxref{--data-size}) plus 11
-times the dictionary size.
-
-@item
-For decompression or testing of a non-seekable file or of standard
-input; 2 times the dictionary size plus up to 32 MiB.
-
-@item
-For decompression of a regular file to a non-seekable file or to
-standard output; the dictionary size plus up to 32 MiB.
-
-@item
-For decompression of a regular file to another regular file, or for
-testing of a regular file; the dictionary size.
-@end itemize
-
 Plzip will automatically use the smallest possible dictionary size for
 each file without exceeding the given limit. Keep in mind that the
 decompression memory requirement is affected at compression time by the
-choice of dictionary size limit.
+choice of dictionary size limit (@pxref{Memory requirements}).
 
 When compressing, plzip replaces every file given in the command line
 with a compressed version of itself, with the name "original_name.lz".
@@ -277,8 +249,8 @@ detect the number of processors in the system and use it as default
 value. @w{@samp{plzip --help}} shows the system's default value.
 
 Note that the number of usable threads is limited to @w{ceil( file_size
-/ data_size )} during compression (@pxref{--data-size}), and to the
-number of members in the input during decompression.
+/ data_size )} during compression (@pxref{Minimum file sizes}), and to
+the number of members in the input during decompression.
 
 @item -o @var{file}
 @itemx --output=@var{file}
@@ -315,8 +287,8 @@ Verbose mode.@*
 When compressing, show the compression ratio for each file processed. A
 second @samp{-v} shows the progress of compression.@*
 When decompressing or testing, further -v's (up to 4) increase the
-verbosity level, showing status, compression ratio, decompressed size,
-and compressed size.
+verbosity level, showing status, compression ratio, dictionary size,
+decompressed size, and compressed size.
 
 @item -1 .. -9
 Set the compression parameters (dictionary size and match length limit)
@@ -327,8 +299,7 @@ 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. For example, @samp{-9m64} usually compresses executables
-more (and faster) than @samp{-9}.
+performance.
 
 @multitable {Level} {Dictionary size} {Match length limit}
 @item Level @tab Dictionary size @tab Match length limit
@@ -449,6 +420,73 @@ facilitates safe recovery of undamaged members from multi-member files.
 @end table
 
 
+@node Memory requirements
+@chapter Memory required to compress and decompress
+@cindex memory requirements
+
+The amount of memory required @strong{per thread} is approximately the
+following:
+
+@itemize @bullet
+@item
+For compression; 11 times the dictionary size plus 3 times the data size
+(@pxref{--data-size}).
+
+@item
+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.
+
+@item
+For testing of a non-seekable file or of standard input; the dictionary
+size plus up to 5 MiB.
+
+@item
+For decompression of a regular file to a non-seekable file or to
+standard output; the dictionary size plus up to 32 MiB.
+
+@item
+For decompression of a non-seekable file or of standard input; the
+dictionary size plus up to 35 MiB.
+@end itemize
+
+
+@node Minimum file sizes
+@chapter Minimum file sizes required for full compression speed
+@cindex minimum file sizes
+
+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.
+
+For this to work as expected (and roughly multiply the compression speed
+by the number of available processors), the uncompressed file must be at
+least as large as the number of worker threads times the chunk size
+(@pxref{--data-size}). Else some processors will not get any data to
+compress, and compression will be proportionally slower. The maximum
+speed increase achievable on a given file is limited by the ratio
+@w{(file_size / data_size)}.
+
+The following table shows the minimum uncompressed file size needed for
+full use of N processors at a given compression level, using the default
+data size for each level:
+
+@multitable {Processors} {128 MiB} {128 MiB} {128 MiB} {128 MiB} {128 MiB} {128 MiB}
+@headitem Processors @tab 2 @tab 3 @tab 4 @tab 8 @tab 16 @tab 64
+@item Level
+@item -1 @tab   4 MiB @tab   6 MiB @tab   8 MiB @tab  16 MiB @tab  32 MiB @tab 128 MiB
+@item -2 @tab   6 MiB @tab   9 MiB @tab  12 MiB @tab  24 MiB @tab  48 MiB @tab 192 MiB
+@item -3 @tab   8 MiB @tab  12 MiB @tab  16 MiB @tab  32 MiB @tab  64 MiB @tab 256 MiB
+@item -4 @tab  12 MiB @tab  18 MiB @tab  24 MiB @tab  48 MiB @tab  96 MiB @tab 384 MiB
+@item -5 @tab  16 MiB @tab  24 MiB @tab  32 MiB @tab  64 MiB @tab 128 MiB @tab 512 MiB
+@item -6 @tab  32 MiB @tab  48 MiB @tab  64 MiB @tab 128 MiB @tab 256 MiB @tab   1 GiB
+@item -7 @tab  64 MiB @tab  96 MiB @tab 128 MiB @tab 256 MiB @tab 512 MiB @tab   2 GiB
+@item -8 @tab  96 MiB @tab 144 MiB @tab 192 MiB @tab 384 MiB @tab 768 MiB @tab   3 GiB
+@item -9 @tab 128 MiB @tab 192 MiB @tab 256 MiB @tab 512 MiB @tab   1 GiB @tab   4 GiB
+@end multitable
+
+
 @node Problems
 @chapter Reporting bugs
 @cindex bugs
diff --git a/file_index.cc b/file_index.cc
index 1a46277..b5c7638 100644
--- a/file_index.cc
+++ b/file_index.cc
@@ -50,7 +50,7 @@ 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_ = 2;
+  retval_ = member_vector.empty() ? 1 : 2;	// maybe trailing garbage
   }
 
 
@@ -74,9 +74,10 @@ File_index::File_index( const int infd )
       retval_ = 2; return; }
   if( !header.verify_version() )
     { set_num_error( "Version ", header.version(),
-                     " member format not supported." ); return; }
+                     " member format not supported." ); retval_ = 2; return; }
 
   long long pos = isize;		// always points to a header or to EOF
+  const long long max_garbage = 1024;
   while( pos >= min_member_size )
     {
     File_trailer trailer;
@@ -86,8 +87,8 @@ File_index::File_index( const int infd )
     const long long member_size = trailer.member_size();
     if( member_size < min_member_size || member_size > pos )
       {
-      if( member_vector.empty() )		// maybe trailing garbage
-        { --pos; continue; }
+      if( member_vector.empty() && isize - pos < max_garbage )
+        { --pos; continue; }			// maybe trailing garbage
       set_num_error( "Member size in trailer is corrupt at pos ", pos - 8 );
       break;
       }
@@ -96,11 +97,12 @@ File_index::File_index( const int infd )
       { set_errno_error( "Error reading member header: " ); break; }
     if( !header.verify_magic() || !header.verify_version() )
       {
-      if( member_vector.empty() )		// maybe trailing garbage
-        { --pos; continue; }
+      if( member_vector.empty() && isize - pos < max_garbage )
+        { --pos; continue; }			// maybe trailing garbage
       set_num_error( "Bad header at pos ", pos - member_size );
       break;
       }
+    const unsigned dictionary_size = header.dictionary_size();
     if( member_vector.empty() && isize - pos > File_header::size &&
         seek_read( infd, header.data, File_header::size, pos ) == File_header::size &&
         header.verify_magic() && header.verify_version() )
@@ -110,7 +112,7 @@ File_index::File_index( const int infd )
       }
     pos -= member_size;
     member_vector.push_back( Member( 0, trailer.data_size(),
-                                     pos, member_size ) );
+                                     pos, member_size, dictionary_size ) );
     }
   if( pos != 0 || member_vector.empty() )
     {
diff --git a/file_index.h b/file_index.h
index 2b1f4b5..bbc12c2 100644
--- a/file_index.h
+++ b/file_index.h
@@ -41,10 +41,11 @@ class File_index
   struct Member
     {
     Block dblock, mblock;		// data block, member block
+    unsigned dictionary_size;
 
     Member( const long long dp, const long long ds,
-            const long long mp, const long long ms )
-      : dblock( dp, ds ), mblock( mp, ms ) {}
+            const long long mp, const long long ms, const unsigned dict_size )
+      : dblock( dp, ds ), mblock( mp, ms ), dictionary_size( dict_size ) {}
     };
 
   std::vector< Member > member_vector;
@@ -74,4 +75,6 @@ public:
     { return member_vector[i].dblock; }
   const Block & mblock( const long i ) const
     { return member_vector[i].mblock; }
+  unsigned dictionary_size( const long i ) const
+    { return member_vector[i].dictionary_size; }
   };
diff --git a/lzip.h b/lzip.h
index df05905..eff9367 100644
--- a/lzip.h
+++ b/lzip.h
@@ -162,7 +162,7 @@ void xwait( pthread_cond_t * const cond, pthread_mutex_t * const mutex );
 void xsignal( pthread_cond_t * const cond );
 void xbroadcast( pthread_cond_t * const cond );
 int compress( const int data_size, const int dictionary_size,
-              const int match_len_limit, int num_workers,
+              const int match_len_limit, const int num_workers,
               const int infd, const int outfd,
               const Pretty_print & pp, const int debug_level );
 
@@ -176,8 +176,7 @@ 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 bool testing );
+                const Pretty_print & pp, const int debug_level );
 
 // defined in decompress.cc
 int preadblock( const int fd, uint8_t * const buf, const int size,
@@ -188,11 +187,12 @@ 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 testing, const bool infd_isreg );
+                const bool infd_isreg );
 
 // defined in main.cc
 extern int verbosity;
 void cleanup_and_fail( const int retval = 1 );	// terminate the program
+void show_header( const unsigned dictionary_size );
 void show_error( const char * const msg, const int errcode = 0,
                  const bool help = false );
 void internal_error( const char * const msg );
diff --git a/main.cc b/main.cc
index df5e28e..29a2ef3 100644
--- a/main.cc
+++ b/main.cc
@@ -130,8 +130,7 @@ void show_help( const long num_online )
                "The 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"
-               "options directly to achieve optimal performance. For example, -9m64\n"
-               "usually compresses executables more (and faster) than -9.\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"
                "invalid input file, 3 for an internal consistency error (eg, bug) which\n"
@@ -152,6 +151,28 @@ void show_version()
                "There is NO WARRANTY, to the extent permitted by law.\n" );
   }
 
+} // end namespace
+
+void show_header( const unsigned dictionary_size )
+  {
+  if( verbosity >= 3 )
+    {
+    const char * const prefix[8] =
+      { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
+    enum { factor = 1024 };
+    const char * p = "";
+    const char * np = "  ";
+    unsigned num = dictionary_size;
+    bool exact = ( num % factor == 0 );
+
+    for( int i = 0; i < 8 && ( num > 9999 || ( exact && num >= factor ) ); ++i )
+      { num /= factor; if( num % factor != 0 ) exact = false;
+        p = prefix[i]; np = ""; }
+    std::fprintf( stderr, "dictionary size %s%4u %sB.  ", np, num, p );
+    }
+  }
+
+namespace {
 
 unsigned long long getnum( const char * const ptr,
                            const unsigned long long llimit,
@@ -323,7 +344,7 @@ bool open_outstream( const bool force )
 
 bool check_tty( const int infd, const Mode program_mode )
   {
-  if( program_mode == m_compress && outfd >= 0 && isatty( outfd ) )
+  if( program_mode == m_compress && isatty( outfd ) )
     {
     show_error( "I won't write compressed data to a terminal.", 0, true );
     return false;
@@ -337,6 +358,32 @@ bool check_tty( const int infd, const Mode program_mode )
   return true;
   }
 
+} // end namespace
+
+// This can be called from any thread, main thread or sub-threads alike,
+// since they all call common helper functions that call cleanup_and_fail()
+// in case of an error.
+//
+void cleanup_and_fail( const int retval )
+  {
+  // only one thread can delete and exit
+  static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+  pthread_mutex_lock( &mutex );		// ignore errors to avoid loop
+  if( delete_output_on_interrupt )
+    {
+    delete_output_on_interrupt = false;
+    if( verbosity >= 0 )
+      std::fprintf( stderr, "%s: Deleting output file '%s', if it exists.\n",
+                    program_name, output_filename.c_str() );
+    if( outfd >= 0 ) { close( outfd ); outfd = -1; }
+    if( std::remove( output_filename.c_str() ) != 0 && errno != ENOENT )
+      show_error( "WARNING: deletion of output file (apparently) failed." );
+    }
+  std::exit( retval );
+  }
+
+namespace {
 
      // Set permissions, owner and times.
 void close_and_set_permissions( const struct stat * const in_statsp )
@@ -431,30 +478,6 @@ void internal_error( const char * const msg )
   }
 
 
-// This can be called from any thread, main thread or sub-threads alike,
-// since they all call common helper functions that call cleanup_and_fail()
-// in case of an error.
-//
-void cleanup_and_fail( const int retval )
-  {
-  // only one thread can delete and exit
-  static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
-
-  pthread_mutex_lock( &mutex );		// ignore errors to avoid loop
-  if( delete_output_on_interrupt )
-    {
-    delete_output_on_interrupt = false;
-    if( verbosity >= 0 )
-      std::fprintf( stderr, "%s: Deleting output file '%s', if it exists.\n",
-                    program_name, output_filename.c_str() );
-    if( outfd >= 0 ) { close( outfd ); outfd = -1; }
-    if( std::remove( output_filename.c_str() ) != 0 && errno != ENOENT )
-      show_error( "WARNING: deletion of output file (apparently) failed." );
-    }
-  std::exit( retval );
-  }
-
-
 void show_progress( const int packet_size,
                     const Pretty_print * const p,
                     const unsigned long long cfile_size )
@@ -464,17 +487,20 @@ void show_progress( const int packet_size,
   static const Pretty_print * pp = 0;
   static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 
-  if( p )					// initialize static vars
-    { csize = cfile_size; pos = 0; pp = p; }
-  if( pp )
+  if( verbosity >= 2 )
     {
-    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 );
+    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 );
+      }
     }
   }
 
@@ -688,15 +714,13 @@ int main( const int argc, const char * const argv[] )
     int tmp;
     if( program_mode == m_compress )
       {
-      if( verbosity >= 2 )	// init
-        show_progress( 0, &pp, infd_isreg ? in_statsp->st_size / 100 : 0 );
+      show_progress( 0, &pp, infd_isreg ? in_statsp->st_size / 100 : 0 ); // init
       tmp = compress( data_size, encoder_options.dictionary_size,
                       encoder_options.match_len_limit,
                       num_workers, infd, outfd, pp, debug_level );
       }
     else
-      tmp = decompress( num_workers, infd, outfd, pp, debug_level,
-                        program_mode == m_test, infd_isreg );
+      tmp = decompress( num_workers, infd, outfd, pp, debug_level, infd_isreg );
     if( tmp > retval ) retval = tmp;
     if( tmp && program_mode != m_test ) cleanup_and_fail( retval );