Adding upstream version 0.1.upstream/0.1

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

1 files changed, 1300 insertions, 0 deletions

diff --git a/main.cc b/main.cc
new file mode 100644
index 0000000..b2bf014
--- /dev/null
+++ b/main.cc
@@ -0,0 +1,1300 @@
+/*  Plzip - A parallel version of the lzip data compressor
+    Copyright (C) 2009 Laszlo Ersek.
+    Copyright (C) 2009 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
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+    Return values: 0 for a normal exit, 1 for environmental problems
+    (file not found, invalid flags, I/O errors, etc), 2 to indicate a
+    corrupt or invalid input file, 3 for an internal consistency error
+    (eg, bug) which caused plzip to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cassert>
+#include <cerrno>
+#include <climits>
+#include <csignal>
+#include <cstdarg>          /* va_list */
+#include <cstddef>
+#include <cstdio>           /* flockfile() */
+#include <cstdlib>
+#include <cstring>          /* strerror() */
+#include <string>
+#include <vector>
+#include <fcntl.h>           /* open() */
+#include <stdint.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <lzlib.h>
+
+#if CHAR_BIT != 8
+#  error "Environments where CHAR_BIT != 8 are not supported."
+#endif
+
+#include "arg_parser.h"
+#include "main.h"
+#include "plzip.h"
+
+#ifndef LLONG_MAX
+#define LLONG_MAX  0x7FFFFFFFFFFFFFFFLL
+#endif
+#ifndef LLONG_MIN
+#define LLONG_MIN  (-LLONG_MAX - 1LL)
+#endif
+#ifndef ULLONG_MAX
+#define ULLONG_MAX 0xFFFFFFFFFFFFFFFFULL
+#endif
+
+void internal_error( const char * msg );
+int readblock( const int fd, char * buf, const int size ) throw();
+int writeblock( const int fd, const char * buf, const int size ) throw();
+
+
+namespace {
+
+const char * invocation_name = 0;
+const char * const Program_name    = "Plzip";
+const char * const program_name    = "plzip";
+const char * const program_year    = "2009";
+
+struct { const char * from; const char * to; } const known_extensions[] = {
+  { ".lz",  ""     },
+  { ".tlz", ".tar" },
+  { 0,      0      } };
+
+struct lzma_options
+  {
+  int dictionary_size;		// 4KiB..512MiB
+  int match_len_limit;		// 5..273
+  };
+
+enum Mode { m_compress = 0, m_decompress, m_test };
+
+std::string output_filename;
+int outhandle = -1;
+int verbosity = 0;
+bool delete_output_on_interrupt = false;
+
+class Pretty_print
+  {
+  const char * const stdin_name;
+  const unsigned int stdin_name_len;
+  unsigned int longest_name;
+  std::string name_;
+  mutable bool first_post;
+
+public:
+  Pretty_print( const std::vector< std::string > & filenames )
+    : stdin_name( "(stdin)" ), stdin_name_len( std::strlen( stdin_name ) ),
+      longest_name( 0 ), first_post( false )
+    {
+    for( unsigned int i = 0; i < filenames.size(); ++i )
+      {
+      const std::string & s = filenames[i];
+      const unsigned int len = ( ( s == "-" ) ? stdin_name_len : s.size() );
+      if( len > longest_name ) longest_name = len;
+      }
+    if( longest_name == 0 ) longest_name = stdin_name_len;
+    }
+
+  void set_name( const std::string & filename )
+    {
+    if( filename.size() && filename != "-" ) name_ = filename;
+    else name_ = stdin_name;
+    first_post = true;
+    }
+
+  void reset() const throw() { if( name_.size() ) first_post = true; }
+  const char * name() const throw() { return name_.c_str(); }
+  void operator()( const char * const msg = 0 ) const throw();
+  };
+
+
+void show_help() throw()
+  {
+  std::printf( "%s - A parallel version of the lzip data compressor.\n", Program_name );
+  std::printf( "\nUsage: %s [options] [files]\n", invocation_name );
+  std::printf( "\nOptions:\n" );
+  std::printf( "  -h, --help                 display this help and exit\n" );
+  std::printf( "  -V, --version              output version information and exit\n" );
+//  std::printf( "  -b, --member-size=<n>      set member size limit in bytes\n" );
+  std::printf( "  -c, --stdout               send output to standard output\n" );
+  std::printf( "  -d, --decompress           decompress\n" );
+//  std::printf( "  -f, --force                overwrite existing output files\n" );
+//  std::printf( "  -k, --keep                 keep (don't delete) input files\n" );
+//  std::printf( "  -m, --match-length=<n>     set match length limit in bytes [80]\n" );
+  std::printf( "  -n, --threads=<n>          set the number of (de)compression threads\n" );
+//  std::printf( "  -o, --output=<file>        if reading stdin, place the output into <file>\n" );
+  std::printf( "  -q, --quiet                suppress all messages\n" );
+//  std::printf( "  -s, --dictionary-size=<n>  set dictionary size limit in bytes [8MiB]\n" );
+//  std::printf( "  -S, --volume-size=<n>      set volume size limit in bytes\n" );
+  std::printf( "  -t, --test                 test compressed file integrity\n" );
+  std::printf( "  -v, --verbose              be verbose (a 2nd -v gives more)\n" );
+  std::printf( "  -1 .. -9                   set compression level [default 6]\n" );
+  std::printf( "      --fast                 alias for -1\n" );
+  std::printf( "      --best                 alias for -9\n" );
+  if( verbosity > 0 )
+    {
+    std::printf( "  -D, --debug=<level>        (0-3) print debug statistics to stderr\n" );
+    }
+  std::printf( "If no file names are given, %s compresses or decompresses\n", program_name );
+  std::printf( "from standard input to standard output.\n" );
+  std::printf( "Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,\n" );
+  std::printf( "Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...\n" );
+  std::printf( "\nReport bugs to lzip-bug@nongnu.org\n" );
+  std::printf( "Lzip home page: http://www.nongnu.org/lzip/lzip.html\n" );
+  }
+
+
+void show_version() throw()
+  {
+  std::printf( "%s %s\n", Program_name, PROGVERSION );
+  std::printf( "Copyright (C) 2009 Laszlo Ersek.\n" );
+  std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
+  std::printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" );
+  std::printf( "This is free software: you are free to change and redistribute it.\n" );
+  std::printf( "There is NO WARRANTY, to the extent permitted by law.\n" );
+  }
+
+
+long long getnum( const char * ptr, const int bs = 0,
+                  const long long llimit = LLONG_MIN + 1,
+                  const long long ulimit = LLONG_MAX ) throw()
+  {
+  errno = 0;
+  char *tail;
+  long long result = strtoll( ptr, &tail, 0 );
+  if( tail == ptr )
+    {
+    show_error( "bad or missing numerical argument", 0, true );
+    std::exit( 1 );
+    }
+
+  if( !errno && tail[0] )
+    {
+    int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
+    int exponent = 0;
+    bool bad_multiplier = false;
+    switch( tail[0] )
+      {
+      case ' ': break;
+      case 'b': if( bs > 0 ) { factor = bs; exponent = 1; }
+                else bad_multiplier = true;
+                break;
+      case 'Y': exponent = 8; break;
+      case 'Z': exponent = 7; break;
+      case 'E': exponent = 6; break;
+      case 'P': exponent = 5; break;
+      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;
+      }
+    if( bad_multiplier )
+      {
+      show_error( "bad multiplier in numerical argument", 0, true );
+      std::exit( 1 );
+      }
+    for( int i = 0; i < exponent; ++i )
+      {
+      if( LLONG_MAX / factor >= llabs( result ) ) result *= factor;
+      else { errno = ERANGE; break; }
+      }
+    }
+  if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
+  if( errno )
+    {
+    show_error( "numerical argument out of limits" );
+    std::exit( 1 );
+    }
+  return result;
+  }
+
+
+int get_dict_size( const char * arg ) throw()
+  {
+  char *tail;
+  int bits = std::strtol( arg, &tail, 0 );
+  if( bits >= min_dictionary_bits && bits <= max_dictionary_bits && *tail == 0 )
+    return ( 1 << bits );
+  return getnum( arg, 0, min_dictionary_size, max_dictionary_size );
+  }
+
+
+int extension_index( const std::string & name ) throw()
+  {
+  for( int i = 0; known_extensions[i].from; ++i )
+    {
+    const std::string ext( known_extensions[i].from );
+    if( name.size() > ext.size() &&
+        name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 )
+      return i;
+    }
+  return -1;
+  }
+
+
+int open_instream( const std::string & name, struct stat * in_statsp,
+                   const Mode program_mode, const int eindex,
+                   const bool force, const bool to_stdout ) throw()
+  {
+  int inhandle = -1;
+  if( program_mode == m_compress && !force && eindex >= 0 )
+    {
+    if( verbosity >= 0 )
+      std::fprintf( stderr, "%s: input file `%s' already has `%s' suffix.\n",
+                    program_name, name.c_str(),
+                    known_extensions[eindex].from );
+    }
+  else
+    {
+    inhandle = open( name.c_str(), O_RDONLY );
+    if( inhandle < 0 )
+      {
+      if( verbosity >= 0 )
+        std::fprintf( stderr, "%s: Can't open input file `%s': %s.\n",
+                      program_name, name.c_str(), std::strerror( errno ) );
+      }
+    else
+      {
+      const int i = fstat( inhandle, in_statsp );
+      const mode_t & mode = in_statsp->st_mode;
+      if( i < 0 || !( S_ISREG( mode ) || ( to_stdout &&
+                      ( S_ISFIFO( mode ) || S_ISSOCK( mode ) ||
+                        S_ISBLK( mode ) || S_ISCHR( mode ) ) ) ) )
+        {
+        if( verbosity >= 0 )
+          std::fprintf( stderr, "%s: input file `%s' is not a regular file%s.\n",
+                        program_name, name.c_str(),
+                        to_stdout ? "" : " and `--stdout' was not specified" );
+        close( inhandle );
+        inhandle = -1;
+        }
+      }
+    }
+  return inhandle;
+  }
+
+
+void set_c_outname( const std::string & name ) throw()
+  {
+  output_filename = name;
+  output_filename += known_extensions[0].from;
+  }
+
+
+void set_d_outname( const std::string & name, const int i ) throw()
+  {
+  if( i >= 0 )
+    {
+    const std::string from( known_extensions[i].from );
+    if( name.size() > from.size() )
+      {
+      output_filename.assign( name, 0, name.size() - from.size() );
+      output_filename += known_extensions[i].to;
+      return;
+      }
+    }
+  output_filename = name; output_filename += ".out";
+  if( verbosity >= 0 )
+    std::fprintf( stderr, "%s: can't guess original name for `%s' -- using `%s'.\n",
+                  program_name, name.c_str(), output_filename.c_str() );
+  }
+
+
+bool open_outstream( const bool force ) throw()
+  {
+  if( force )
+    outhandle = open( output_filename.c_str(), O_CREAT | O_TRUNC | O_WRONLY,
+                      S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
+  else outhandle = open( output_filename.c_str(), O_CREAT | O_EXCL | O_WRONLY,
+                         S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
+  if( outhandle < 0 )
+    {
+    if( errno == EEXIST ) outhandle = -2; else outhandle = -1;
+    if( verbosity >= 0 )
+      {
+      if( outhandle == -2 )
+        std::fprintf( stderr, "%s: Output file %s already exists, skipping.\n",
+                      program_name, output_filename.c_str() );
+      else
+        std::fprintf( stderr, "%s: Can't create output file `%s': %s.\n",
+                      program_name, output_filename.c_str(), std::strerror( errno ) );
+      }
+    }
+  return ( outhandle >= 0 );
+  }
+
+
+bool check_tty( const int inhandle, const Mode program_mode ) throw()
+  {
+  if( program_mode == m_compress && isatty( outhandle ) )
+    {
+    show_error( "I won't write compressed data to a terminal.", 0, true );
+    return false;
+    }
+  if( ( program_mode == m_decompress || program_mode == m_test ) &&
+      isatty( inhandle ) )
+    {
+    show_error( "I won't read compressed data from a terminal.", 0, true );
+    return false;
+    }
+  return true;
+  }
+
+
+void cleanup_and_fail( const int retval ) throw()
+  {
+  if( delete_output_on_interrupt )
+    {
+    if( verbosity >= 0 )
+      std::fprintf( stderr, "%s: Deleting output file `%s', if it exists.\n",
+               program_name, output_filename.c_str() );
+    if( outhandle >= 0 ) { close( outhandle ); outhandle = -1; }
+    if( std::remove( output_filename.c_str() ) != 0 )
+      show_error( "WARNING: deletion of output file (apparently) failed." );
+    }
+  std::exit( retval );
+  }
+
+
+     // Set permissions, owner and times.
+void close_and_set_permissions( const struct stat * in_statsp, int * retvalp )
+  {
+  int tmp = 0;
+  if( in_statsp )
+    {
+    if( fchmod( outhandle, in_statsp->st_mode ) != 0 ) tmp = 1;
+    if( !tmp ) (void)fchown( outhandle, in_statsp->st_uid, in_statsp->st_gid );
+    // fchown will in many cases return with EPERM, which can be safely ignored.
+    }
+  if( close( outhandle ) == 0 ) outhandle = -1;
+  else cleanup_and_fail( 1 );
+  delete_output_on_interrupt = false;
+  if( !in_statsp ) return;
+  if( !tmp )
+    {
+    struct utimbuf t;
+    t.actime = in_statsp->st_atime;
+    t.modtime = in_statsp->st_mtime;
+    if( utime( output_filename.c_str(), &t ) != 0 ) tmp = 1;
+    }
+  if( tmp )
+    {
+    if( tmp > *retvalp ) *retvalp = tmp;
+    show_error( "I can't change output file attributes." );
+    cleanup_and_fail( *retvalp );
+    }
+  }
+
+
+int decompress( const int inhandle, const Pretty_print & pp,
+                const bool testing )
+  {
+  void * decoder = LZ_decompress_open();
+  if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
+    {
+    LZ_decompress_close( decoder );
+    pp( "not enough memory. Find a machine with more memory" );
+    return 1;
+    }
+  if( verbosity >= 1 ) pp();
+
+  const int in_buffer_size = 65536, out_buffer_size = 8 * in_buffer_size;
+  uint8_t in_buffer[in_buffer_size], out_buffer[out_buffer_size];
+  int in_pos = 0, in_stream_pos = 0;
+  bool finished = false;
+  while( true )
+    {
+    int in_size = 0;
+    if( !finished )
+      {
+      if( in_stream_pos == 0 )
+        in_stream_pos = readblock( inhandle, (char *)in_buffer, in_buffer_size );
+      if( in_pos < in_stream_pos )
+        {
+        in_size = LZ_decompress_write( decoder, in_buffer + in_pos, in_stream_pos - in_pos );
+        in_pos += in_size;
+        }
+      if( in_pos >= in_stream_pos )
+        {
+        if( in_stream_pos < in_buffer_size )
+          { finished = true; LZ_decompress_finish( decoder ); }
+        in_stream_pos = 0; in_pos = 0;
+        }
+      }
+    int out_size = LZ_decompress_read( decoder, out_buffer, out_buffer_size );
+//    std::fprintf( stderr, "%5d in_size, %6d out_size.\n", in_size, out_size );
+    if( out_size < 0 )
+      {
+      const LZ_errno lz_errno = LZ_decompress_errno( decoder );
+      if( lz_errno == LZ_header_error )
+        {
+        if( LZ_decompress_total_out_size( decoder ) > 0 )
+          break;				// trailing garbage
+        pp( "error reading member header" );
+        return 1;
+        }
+      if( lz_errno == LZ_mem_error )
+        {
+        pp( "not enough memory. Find a machine with more memory" );
+        return 1;
+        }
+      if( lz_errno == LZ_unexpected_eof )
+        {
+        if( verbosity >= 0 )
+          { pp();
+            std::fprintf( stderr, "file ends unexpectedly at pos %lld\n",
+                          LZ_decompress_total_in_size( decoder ) ); }
+        return 2;
+        }
+      pp(); show_error( "read error", errno ); return 1;
+      }
+    else if( out_size > 0 && outhandle >= 0 )
+      {
+      const int wr = writeblock( outhandle, (char *)out_buffer, out_size );
+      if( wr != out_size )
+        { pp(); show_error( "write error", errno ); return 1; }
+      }
+    if( LZ_decompress_finished( decoder ) == 1 ) break;
+    if( finished && in_size == 0 && out_size == 0 )
+      internal_error( "library error (LZ_decompress_read)" );
+    }
+  if( verbosity >= 1 )
+    { if( testing ) std::fprintf( stderr, "ok\n" );
+      else std::fprintf( stderr, "done\n" ); }
+  LZ_decompress_close( decoder );
+  return 0;
+  }
+
+
+extern "C" void signal_handler( int ) throw()
+  {
+  show_error( "Control-C or similar caught, quitting." );
+  cleanup_and_fail( 1 );
+  }
+
+
+void set_signals() throw()
+  {
+  signal( SIGHUP, signal_handler );
+  signal( SIGINT, signal_handler );
+  signal( SIGTERM, signal_handler );
+  }
+
+} // end namespace
+
+
+void Pretty_print::operator()( const char * const msg ) const throw()
+  {
+  if( verbosity >= 0 )
+    {
+    if( first_post )
+      {
+      first_post = false;
+      std::fprintf( stderr, "  %s: ", name_.c_str() );
+      for( unsigned int i = 0; i < longest_name - name_.size(); ++i )
+        std::fprintf( stderr, " " );
+      if( !msg ) std::fflush( stderr );
+      }
+    if( msg ) std::fprintf( stderr, "%s.\n", msg );
+    }
+  }
+
+
+/* Private stuff needed by fatal(). */
+static pthread_t main_thread;
+
+static pid_t pid;
+
+
+/* Public utility variables and functions. */
+void *(*mallocf)(size_t size);
+void (*freef)(void *ptr);
+
+
+/*
+  This can be called from any thread, main thread or sub-threads alike, since
+  they all call common helper functions that call fatal() in case of an error.
+*/
+void
+fatal(void)
+{
+  if( pthread_equal(pthread_self(), main_thread) )
+    cleanup_and_fail( 1 );
+  else
+    {
+    if (0 == kill(pid, SIGUSR1))
+      pthread_exit(0);
+    }
+  _exit(EXIT_FAILURE);
+}
+
+
+void
+fail(const char *fmt, int err, ...)
+{
+  va_list args;
+
+  /* Locking stderr should also protect strerror(). */
+  flockfile(stderr);
+  (void)fprintf(stderr, "%s: ", program_name);
+
+  va_start(args, err);
+  (void)vfprintf(stderr, fmt, args);
+  va_end(args);
+
+  (void)fprintf(stderr, ": %s\n", strerror(err));
+  funlockfile(stderr);
+  /* Stream stderr is never fully buffered originally. */
+  fatal();
+}
+
+
+void *
+xalloc(size_t size)
+{
+  void *ret = (*mallocf)(size);
+
+  if (0 == ret) {
+    fail("(*mallocf)()", errno);
+  }
+
+  return ret;
+}
+
+
+void
+xinit(Cond *cond)
+{
+  int ret;
+  pthread_mutexattr_t attr;
+
+  ret = pthread_mutexattr_init(&attr);
+  if (0 != ret) {
+    fail("pthread_mutexattr_init()", ret);
+  }
+
+  ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
+  if (0 != ret) {
+    fail("pthread_mutexattr_settype()", ret);
+  }
+
+  ret = pthread_mutex_init(&cond->lock, &attr);
+  if (0 != ret) {
+    fail("pthread_mutex_init()", ret);
+  }
+
+  ret = pthread_mutexattr_destroy(&attr);
+  if (0 != ret) {
+    fail("pthread_mutexattr_destroy()", ret);
+  }
+
+  ret = pthread_cond_init(&cond->cond, 0);
+  if (0 != ret) {
+    fail("pthread_cond_init()", ret);
+  }
+
+  cond->ccount = 0lu;
+  cond->wcount = 0lu;
+}
+
+
+void
+xdestroy(Cond *cond)
+{
+  int ret;
+
+  ret = pthread_cond_destroy(&cond->cond);
+  if (0 != ret) {
+    fail("pthread_cond_destroy()", ret);
+  }
+
+  ret = pthread_mutex_destroy(&cond->lock);
+  if (0 != ret) {
+    fail("pthread_mutex_destroy()", ret);
+  }
+}
+
+
+void
+xlock(Cond *cond)
+{
+  int ret;
+
+  ret = pthread_mutex_lock(&cond->lock);
+  if (0 != ret) {
+    fail("pthread_mutex_lock()", ret);
+  }
+}
+
+
+void
+xlock_pred(Cond *cond)
+{
+  xlock(cond);
+  ++cond->ccount;
+}
+
+
+void
+xunlock(Cond *cond)
+{
+  int ret;
+
+  ret = pthread_mutex_unlock(&cond->lock);
+  if (0 != ret) {
+    fail("pthread_mutex_unlock()", ret);
+  }
+}
+
+
+void
+xwait(Cond *cond)
+{
+  int ret;
+
+  ++cond->wcount;
+  ret = pthread_cond_wait(&cond->cond, &cond->lock);
+  if (0 != ret) {
+    fail("pthread_cond_wait()", ret);
+  }
+  ++cond->ccount;
+}
+
+
+void
+xsignal(Cond *cond)
+{
+  int ret;
+
+  ret = pthread_cond_signal(&cond->cond);
+  if (0 != ret) {
+    fail("pthread_cond_signal()", ret);
+  }
+}
+
+
+void
+xbroadcast(Cond *cond)
+{
+  int ret;
+
+  ret = pthread_cond_broadcast(&cond->cond);
+  if (0 != ret) {
+    fail("pthread_cond_broadcast()", ret);
+  }
+}
+
+
+void
+xcreate(pthread_t *thread, void *(*routine)(void *), void *arg)
+{
+  int ret;
+
+  ret = pthread_create(thread, 0, routine, arg);
+  if (0 != ret) {
+    fail("pthread_create()", ret);
+  }
+}
+
+
+void
+xjoin(pthread_t thread)
+{
+  int ret;
+
+  ret = pthread_join(thread, 0);
+  if (0 != ret) {
+    fail("pthread_join()", ret);
+  }
+}
+
+
+void
+xraise(int sig)
+{
+  if (-1 == kill(pid, sig)) {
+    fail("kill()", errno);
+  }
+}
+
+
+/* Private stuff part 2. */
+
+struct Opts
+{
+  unsigned num_worker;  /* Start this many worker threads. */
+  unsigned clidx;       /* Compression level index in [0u .. 8u]. */
+  int print_cctrs;      /* Print condition variable counters. */
+};
+
+/* Backlog factor for all workers together. */
+static const unsigned blf = 3u;
+
+/* Separator characters in environment variable values. No escaping. */
+static const char envsep[] = " \t";
+
+
+static void *
+trace_malloc(size_t size)
+{
+  void *ret;
+  int save_errno = 0;
+
+  ret = malloc(size);
+  if (0 == ret) {
+    save_errno = errno;
+  }
+
+  if (0 > fprintf(stderr, "%lu: malloc(%lu) == %p\n", (long unsigned)pid,
+      (long unsigned)size, ret)
+  ) {
+    fatal();
+  }
+
+  if (0 == ret) {
+    errno = save_errno;
+  }
+
+  return ret;
+}
+
+
+static void
+trace_free(void *ptr)
+{
+  if (0 > fprintf(stderr, "%lu: free(%p)\n", (long unsigned)pid, ptr)) {
+    fatal();
+  }
+  free(ptr);
+}
+
+
+static void
+xsigemptyset(sigset_t *set)
+{
+  if (-1 == sigemptyset(set)) {
+    fail("sigemptyset()", errno);
+  }
+}
+
+
+static void
+xsigaddset(sigset_t *set, int signo)
+{
+  if (-1 == sigaddset(set, signo)) {
+    fail("sigaddset()", errno);
+  }
+}
+
+
+static void
+xsigmask(int how, const sigset_t *set, sigset_t *oset)
+{
+  int ret;
+
+  ret = pthread_sigmask(how, set, oset);
+  if (0 != ret) {
+    fail("pthread_sigmask()", ret);
+  }
+}
+
+
+static void
+xsigaction(int sig, void (*handler)(int))
+{
+  struct sigaction act;
+
+  act.sa_handler = handler;
+  xsigemptyset(&act.sa_mask);
+  act.sa_flags = 0;
+
+  if (-1 == sigaction(sig, &act, 0)) {
+    fail("sigaction()", errno);
+  }
+}
+
+
+enum caught_sig
+{
+  CS_INT = 1,
+  CS_TERM,
+  CS_USR1,
+  CS_USR2
+};
+
+static volatile sig_atomic_t caught_sig;
+
+
+static void
+sighandler(int sig)
+{
+  /* sig_atomic_t is nowhere required to be able to hold signal values. */
+  switch (sig) {
+    case SIGINT:
+      caught_sig = CS_INT;
+      break;
+
+    case SIGTERM:
+      caught_sig = CS_TERM;
+      break;
+
+    case SIGUSR1:
+      caught_sig = CS_USR1;
+      break;
+
+    case SIGUSR2:
+      caught_sig = CS_USR2;
+      break;
+
+    default:
+      assert(0);
+  }
+}
+
+
+static void
+process( const Opts *opts, unsigned num_slot,
+    int infd, int outfd, const Pretty_print & pp, const sigset_t *unblocked )
+{
+  /*
+    We could wait for signals with either sigwait() or sigsuspend(). SUSv2
+    states about sigwait() that its effect on signal actions is unspecified.
+    SUSv3 still claims the same.
+
+    The SUSv2 description of sigsuspend() talks about both the thread and the
+    whole process being suspended until a signal arrives, although thread
+    suspension seems much more likely from the wording. They note that they
+    filed a clarification request for this. SUSv3 cleans this up and chooses
+    thread suspension which was more logical anyway.
+
+    I favor sigsuspend() because I need to re-raise SIGTERM and SIGINT, and
+    unspecified action behavior with sigwait() seems messy.
+
+    13-OCT-2009 lacos
+  */
+
+  Plzip_arg muxer_arg;
+  pthread_t muxer;
+
+  if( verbosity >= 1 ) pp( "" );
+
+  muxer_arg.num_worker = opts->num_worker;
+  muxer_arg.num_slot = num_slot;
+  muxer_arg.clidx = opts->clidx;
+  muxer_arg.print_cctrs = opts->print_cctrs;
+  muxer_arg.infd = infd;
+  muxer_arg.outfd = outfd;
+  xcreate(&muxer, plzip_wrap, &muxer_arg);
+
+  /* Unblock signals, wait for them, then block them again. */
+  {
+    int ret = sigsuspend(unblocked);
+    assert(-1 == ret && EINTR == errno);
+  }
+
+  switch (caught_sig) {
+    case CS_INT:
+    case CS_TERM:	// FIXME remove output file
+      {
+        int sig;
+        sigset_t mask;
+
+        sig = (CS_INT == caught_sig) ? SIGINT : SIGTERM;
+        /*
+          We might have inherited a SIG_IGN from the parent, but that would
+          make no sense here. 24-OCT-2009 lacos
+        */
+        xsigaction(sig, SIG_DFL);
+        xraise(sig);
+
+        xsigemptyset(&mask);
+        xsigaddset(&mask, sig);
+        xsigmask(SIG_UNBLOCK, &mask, 0);
+      }
+      /*
+        We shouldn't reach this point, but if we do for some reason, fall
+        through.
+      */
+
+    case CS_USR1:
+      /* Error from a non-main thread via fatal(). */
+      fatal();
+
+    case CS_USR2:
+      /* Muxer thread joined other sub-threads and finished successfully. */
+      break;
+
+    default:
+      assert(0);
+  }
+
+  xjoin(muxer);
+}
+
+
+static void
+sigs_mod(int block_n_catch, sigset_t *oset)
+{
+  void (*handler)(int);
+
+  if (block_n_catch) {
+    sigset_t mask;
+
+    xsigemptyset(&mask);
+    xsigaddset(&mask, SIGINT);
+    xsigaddset(&mask, SIGTERM);
+    xsigaddset(&mask, SIGUSR1);
+    xsigaddset(&mask, SIGUSR2);
+    xsigmask(SIG_BLOCK, &mask, oset);
+
+    handler = sighandler;
+  }
+  else {
+    handler = SIG_DFL;
+  }
+
+  xsigaction(SIGINT,  handler);
+  xsigaction(SIGTERM, handler);
+  xsigaction(SIGUSR1, handler);
+  xsigaction(SIGUSR2, handler);
+
+  if (!block_n_catch) {
+    xsigmask(SIG_SETMASK, oset, 0);
+  }
+}
+
+
+void show_error( const char * msg, const int errcode, const bool help ) throw()
+  {
+  if( verbosity >= 0 )
+    {
+    if( msg && msg[0] != 0 )
+      {
+      std::fprintf( stderr, "%s: %s", program_name, msg );
+      if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
+      std::fprintf( stderr, "\n" );
+      }
+    if( help && invocation_name && invocation_name[0] != 0 )
+      std::fprintf( stderr, "Try `%s --help' for more information.\n", invocation_name );
+    }
+  }
+
+
+void internal_error( const char * msg )
+  {
+  std::string s( "internal error: " ); s += msg;
+  show_error( s.c_str() );
+  std::exit( 3 );
+  }
+
+
+// Returns the number of bytes really read.
+// If (returned value < size) and (errno == 0), means EOF was reached.
+//
+int readblock( const int fd, char * buf, const int size ) throw()
+  {
+  int rest = size;
+  errno = 0;
+  while( rest > 0 )
+    {
+    errno = 0;
+    const int n = read( fd, buf + size - rest, rest );
+    if( n > 0 ) rest -= n;
+    else if( n == 0 ) break;
+    else if( errno != EINTR && errno != EAGAIN ) break;
+    }
+  return ( rest > 0 ) ? size - rest : size;
+  }
+
+
+// Returns the number of bytes really written.
+// If (returned value < size), it is always an error.
+//
+int writeblock( const int fd, const char * buf, const int size ) throw()
+  {
+  int rest = size;
+  errno = 0;
+  while( rest > 0 )
+    {
+    errno = 0;
+    const int n = write( fd, buf + size - rest, rest );
+    if( n > 0 ) rest -= n;
+    else if( errno && errno != EINTR && errno != EAGAIN ) break;
+    }
+  return ( rest > 0 ) ? size - rest : size;
+  }
+
+
+int main( const int argc, const char * argv[] )
+  {
+  Opts opts;
+  // Mapping from gzip/bzip2 style 1..9 compression modes
+  // to the corresponding LZMA compression modes.
+  const lzma_options option_mapping[] =
+    {
+    { 1 << 20,  10 },		// -1
+    { 1 << 20,  12 },		// -2
+    { 1 << 20,  17 },		// -3
+    { 1 << 21,  26 },		// -4
+    { 1 << 22,  44 },		// -5
+    { 1 << 23,  80 },		// -6
+    { 1 << 24, 108 },		// -7
+    { 1 << 24, 163 },		// -8
+    { 1 << 25, 273 } };		// -9
+  lzma_options encoder_options = option_mapping[5];	// default = "-6"
+  int inhandle = -1;
+  Mode program_mode = m_compress;
+  bool force = false;
+  bool keep_input_files = false;
+  bool to_stdout = false;
+  std::string input_filename;
+  std::string default_output_filename;
+  std::vector< std::string > filenames;
+  invocation_name = argv[0];
+
+  if( LZ_version()[0] != LZ_version_string[0] )
+    internal_error( "bad library version" );
+
+  main_thread = pthread_self();
+  pid = getpid();
+
+  mallocf = malloc;
+  freef = free;
+
+  xsigaction(SIGPIPE, SIG_IGN);
+  xsigaction(SIGXFSZ, SIG_IGN);
+
+  /* Effectuate option defaults. */
+  long max_worker = sysconf(_SC_THREAD_THREADS_MAX);
+  if (-1L == max_worker) {
+    max_worker = LONG_MAX;
+  }
+  if (UINT_MAX < (long unsigned)max_worker) {
+    max_worker = UINT_MAX;
+  }
+  if (UINT_MAX / blf < (unsigned)max_worker) {
+    max_worker = UINT_MAX / blf;
+  }
+  if ((size_t)-1 / sizeof(pthread_t) < (unsigned)max_worker) {
+    max_worker = (size_t)-1 / sizeof(pthread_t);
+  }
+
+  opts.num_worker = 0u;
+  opts.clidx = 5u;
+  opts.print_cctrs = 0;
+
+  const Arg_parser::Option options[] =
+    {
+    { '1', "fast",            Arg_parser::no  },
+    { '2',  0,                Arg_parser::no  },
+    { '3',  0,                Arg_parser::no  },
+    { '4',  0,                Arg_parser::no  },
+    { '5',  0,                Arg_parser::no  },
+    { '6',  0,                Arg_parser::no  },
+    { '7',  0,                Arg_parser::no  },
+    { '8',  0,                Arg_parser::no  },
+    { '9', "best",            Arg_parser::no  },
+    { 'b', "member-size",     Arg_parser::yes },
+    { 'c', "stdout",          Arg_parser::no  },
+    { 'd', "decompress",      Arg_parser::no  },
+    { 'D', "debug",           Arg_parser::yes },
+    { 'f', "force",           Arg_parser::no  },
+    { 'h', "help",            Arg_parser::no  },
+    { 'k', "keep",            Arg_parser::no  },
+    { 'm', "match-length",    Arg_parser::yes },
+    { 'n', "threads",         Arg_parser::yes },
+    { 'o', "output",          Arg_parser::yes },
+    { 'q', "quiet",           Arg_parser::no  },
+    { 's', "dictionary-size", Arg_parser::yes },
+    { 'S', "volume-size",     Arg_parser::yes },
+    { 't', "test",            Arg_parser::no  },
+    { 'v', "verbose",         Arg_parser::no  },
+    { 'V', "version",         Arg_parser::no  },
+    {  0 ,  0,                Arg_parser::no  } };
+
+  Arg_parser parser( argc, argv, options );
+  if( parser.error().size() )				// bad option
+    { show_error( parser.error().c_str(), 0, true ); return 1; }
+
+  int argind = 0;
+  for( ; argind < parser.arguments(); ++argind )
+    {
+    const int code = parser.code( argind );
+    if( !code ) break;					// no more options
+    const char * arg = parser.argument( argind ).c_str();
+    switch( code )
+      {
+      case '1': case '2': case '3':
+      case '4': case '5': case '6':
+      case '7': case '8': case '9':
+                opts.clidx = code - '1';
+                encoder_options = option_mapping[code-'1']; break;
+      case 'c': to_stdout = true; break;
+      case 'd': program_mode = m_decompress; break;
+      case 'D': { int debug_level = getnum( arg, 0, 0, 3 );
+                  if( debug_level & 1 ) opts.print_cctrs = 1;
+                  if( debug_level & 2 )
+                    { mallocf = trace_malloc; freef = trace_free; } }
+                break;
+      case 'f': force = true; break;
+      case 'h': show_help(); return 0;
+      case 'k': keep_input_files = true; break;
+      case 'm': encoder_options.match_len_limit =
+                getnum( arg, 0, 5, 273 ); break;
+      case 'o': default_output_filename = arg; break;
+      case 'n': opts.num_worker = getnum( arg, 0, 1, max_worker ); break;
+      case 'q': verbosity = -1; break;
+      case 's': encoder_options.dictionary_size = get_dict_size( arg );
+                break;
+      case 't': program_mode = m_test; break;
+      case 'v': if( verbosity < 4 ) ++verbosity; break;
+      case 'V': show_version(); return 0;
+      default : internal_error( "uncaught option" );
+      }
+    }
+
+  if( opts.num_worker <= 0 )
+    {
+#ifdef _SC_NPROCESSORS_ONLN
+    long num_online = sysconf( _SC_NPROCESSORS_ONLN );
+    if( num_online <= 0 )
+      {
+      show_error( "number of online processors unavailable.", 0, true );
+      fatal();
+      }
+    opts.num_worker = std::min( num_online, max_worker );
+#else
+    show_error( "number of (de)compression threads not set.", 0, true );
+    fatal();
+#endif
+    }
+  assert(UINT_MAX / blf >= opts.num_worker);
+  unsigned num_slot = opts.num_worker * blf;
+
+  bool filenames_given = false;
+  for( ; argind < parser.arguments(); ++argind )
+    {
+    if( parser.argument( argind ) != "-" ) filenames_given = true;
+    filenames.push_back( parser.argument( argind ) );
+    }
+
+  if( filenames.empty() ) filenames.push_back("-");
+  if( filenames_given && program_mode != m_compress ) set_signals();
+
+  Pretty_print pp( filenames );
+  if( program_mode == m_test )
+    outhandle = -1;
+
+  int retval = 0;
+  for( unsigned int i = 0; i < filenames.size(); ++i )
+    {
+    struct stat in_stats;
+    output_filename.clear();
+
+    if( !filenames[i].size() || filenames[i] == "-" )
+      {
+      input_filename.clear();
+      inhandle = STDIN_FILENO;
+      if( program_mode != m_test )
+        {
+        if( to_stdout || !default_output_filename.size() )
+          outhandle = STDOUT_FILENO;
+        else
+          {
+          if( program_mode == m_compress )
+            set_c_outname( default_output_filename );
+          else output_filename = default_output_filename;
+          if( !open_outstream( force ) )
+            {
+            if( outhandle == -1 && retval < 1 ) retval = 1;
+            close( inhandle ); inhandle = -1;
+            continue;
+            }
+          }
+        }
+      }
+    else
+      {
+      input_filename = filenames[i];
+      const int eindex = extension_index( input_filename );
+      inhandle = open_instream( input_filename, &in_stats, program_mode,
+                                eindex, force, to_stdout );
+      if( inhandle < 0 ) { if( retval < 1 ) retval = 1; continue; }
+      if( program_mode != m_test )
+        {
+        if( to_stdout ) outhandle = STDOUT_FILENO;
+        else
+          {
+          if( program_mode == m_compress )
+            set_c_outname( input_filename );
+          else set_d_outname( input_filename, eindex );
+          if( !open_outstream( force ) )
+            {
+            if( outhandle == -1 && retval < 1 ) retval = 1;
+            close( inhandle ); inhandle = -1;
+            continue;
+            }
+          }
+        }
+      }
+
+    if( !check_tty( inhandle, program_mode ) ) return 1;
+
+    if( output_filename.size() && !to_stdout && program_mode != m_test )
+      delete_output_on_interrupt = true;
+    const struct stat * in_statsp = input_filename.size() ? &in_stats : 0;
+    pp.set_name( input_filename );
+    int tmp = 0;
+    if( program_mode == m_compress )
+      {
+      sigset_t unblocked;
+      sigs_mod(1, &unblocked);
+      process( &opts, num_slot, inhandle, outhandle, pp, &unblocked );
+      sigs_mod(0, &unblocked);
+      }
+    else
+      tmp = decompress( inhandle, pp, program_mode == m_test );
+    if( tmp > retval ) retval = tmp;
+    if( tmp && program_mode != m_test ) cleanup_and_fail( retval );
+
+    if( delete_output_on_interrupt )
+      close_and_set_permissions( in_statsp, &retval );
+    if( input_filename.size() )
+      {
+      close( inhandle ); inhandle = -1;
+      if( !keep_input_files && !to_stdout && program_mode != m_test )
+        std::remove( input_filename.c_str() );
+      }
+    }
+  if( outhandle >= 0 && close( outhandle ) != 0 )
+    {
+    if( verbosity >= 0 )
+      std::fprintf( stderr, "%s: Can't close stdout: %s.\n",
+                    program_name, std::strerror( errno ) );
+    if( retval < 1 ) retval = 1;
+    }
+  return retval;
+  }