Adding upstream version 1.14.upstream/1.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 996 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..059d716
--- /dev/null
+++ b/main.c
@@ -0,0 +1,996 @@
+/* Lunzip - Decompressor for the lzip format
+   Copyright (C) 2010-2024 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 2 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/>.
+*/
+/*
+   Exit status: 0 for a normal exit, 1 for environmental problems
+   (file not found, invalid command-line options, I/O errors, etc), 2 to
+   indicate a corrupt or invalid input file, 3 for an internal consistency
+   error (e.g., bug) which caused lunzip to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>		/* SSIZE_MAX */
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>		/* SIZE_MAX */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__
+#include <io.h>
+#if defined __MSVCRT__
+#define fchmod(x,y) 0
+#define fchown(x,y,z) 0
+#define SIGHUP SIGTERM
+#define S_ISSOCK(x) 0
+#ifndef S_IRGRP
+#define S_IRGRP 0
+#define S_IWGRP 0
+#define S_IROTH 0
+#define S_IWOTH 0
+#endif
+#endif
+#if defined __DJGPP__
+#define S_ISSOCK(x) 0
+#define S_ISVTX 0
+#endif
+#endif
+
+#include "carg_parser.h"
+#include "lzip.h"
+#include "decoder.h"
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#if CHAR_BIT != 8
+#error "Environments where CHAR_BIT != 8 are not supported."
+#endif
+
+#if ( defined  SIZE_MAX &&  SIZE_MAX < UINT_MAX ) || \
+    ( defined SSIZE_MAX && SSIZE_MAX <  INT_MAX )
+#error "Environments where 'size_t' is narrower than 'int' are not supported."
+#endif
+
+int verbosity = 0;
+
+static const char * const program_name = "lunzip";
+static const char * const program_year = "2024";
+static const char * invocation_name = "lunzip";		/* default value */
+
+static const struct { const char * from; const char * to; } known_extensions[] = {
+  { ".lz",  ""     },
+  { ".tlz", ".tar" },
+  { 0,      0      } };
+
+enum Mode { m_compress, m_decompress, m_list, m_test };
+
+/* Variables used in signal handler context.
+   They are not declared volatile because the handler never returns. */
+static char * output_filename = 0;
+static int outfd = -1;
+static bool delete_output_on_interrupt = false;
+
+
+static void show_help( void )
+  {
+  printf( "Lunzip is a decompressor for the lzip format written in C. Its small size\n"
+          "makes it well suited for embedded devices or software installers that need\n"
+          "to decompress files but don't need compression capabilities. Lunzip is\n"
+          "compatible with lzip 1.4 or newer.\n"
+          "\nLzip is a lossless data compressor with a user interface similar to the one\n"
+          "of gzip or bzip2. Lzip uses a simplified form of the 'Lempel-Ziv-Markov\n"
+          "chain-Algorithm' (LZMA) stream format to maximize interoperability. The\n"
+          "maximum dictionary size is 512 MiB so that any lzip file can be decompressed\n"
+          "on 32-bit machines. Lzip provides accurate and robust 3-factor integrity\n"
+          "checking. Lzip can compress about as fast as gzip (lzip -0) or compress most\n"
+          "files more than bzip2 (lzip -9). Decompression speed is intermediate between\n"
+          "gzip and bzip2. Lzip is better than gzip and bzip2 from a data recovery\n"
+          "perspective. Lzip has been designed, written, and tested with great care to\n"
+          "replace gzip and bzip2 as the standard general-purpose compressed format for\n"
+          "Unix-like systems.\n"
+          "\nLunzip provides a 'low memory' mode able to decompress any file using as\n"
+          "little memory as 50 kB, irrespective of the dictionary size used to\n"
+          "compress the file. To activate it, specify the size of the output buffer\n"
+          "with the option --buffer-size and lunzip will use the decompressed\n"
+          "file as dictionary for distances beyond the buffer size. Of course, the\n"
+          "larger the difference between the buffer size and the dictionary size, the\n"
+          "more accesses to disk are needed and the slower the decompression is.\n"
+          "This 'low memory' mode only works when decompressing to a regular file\n"
+          "and is intended for systems without enough memory (RAM + swap) to keep\n"
+          "the whole dictionary at once.\n"
+          "\nUsage: %s [options] [files]\n", invocation_name );
+  printf( "\nOptions:\n"
+          "  -h, --help                 display this help and exit\n"
+          "  -V, --version              output version information and exit\n"
+          "  -a, --trailing-error       exit with error status if trailing data\n"
+          "  -c, --stdout               write to standard output, keep input files\n"
+          "  -d, --decompress           decompress (this is the default)\n"
+          "  -f, --force                overwrite existing output files\n"
+          "  -k, --keep                 keep (don't delete) input files\n"
+          "  -l, --list                 print (un)compressed file sizes\n"
+          "  -o, --output=<file>        write to <file>, keep input files\n"
+          "  -q, --quiet                suppress all messages\n"
+          "  -t, --test                 test compressed file integrity\n"
+          "  -u, --buffer-size=<bytes>  set output buffer size in bytes\n"
+          "  -v, --verbose              be verbose (a 2nd -v gives more)\n"
+          "      --empty-error          exit with error status if empty member in file\n"
+          "      --marking-error        exit with error status if 1st LZMA byte not 0\n"
+          "      --loose-trailing       allow trailing data seeming corrupt header\n"
+          "\nIf no file names are given, or if a file is '-', lunzip decompresses\n"
+          "from standard input to standard output.\n"
+          "Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,\n"
+          "Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...\n"
+          "Buffer sizes 12 to 29 are interpreted as powers of two, meaning 2^12 to\n"
+          "2^29 bytes.\n"
+          "\nTo extract all the files from archive 'foo.tar.lz', use the commands\n"
+          "'tar -xf foo.tar.lz' or 'lunzip -cd foo.tar.lz | tar -xf -'.\n"
+          "\nExit status: 0 for a normal exit, 1 for environmental problems\n"
+          "(file not found, invalid command-line options, I/O errors, etc), 2 to\n"
+          "indicate a corrupt or invalid input file, 3 for an internal consistency\n"
+          "error (e.g., bug) which caused lunzip to panic.\n"
+          "\nThe ideas embodied in lunzip are due to (at least) the following people:\n"
+          "Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrei Markov (for the\n"
+          "definition of Markov chains), G.N.N. Martin (for the definition of range\n"
+          "encoding), Igor Pavlov (for putting all the above together in LZMA), and\n"
+          "Julian Seward (for bzip2's CLI).\n"
+          "\nReport bugs to lzip-bug@nongnu.org\n"
+          "Lunzip home page: http://www.nongnu.org/lzip/lunzip.html\n" );
+  }
+
+
+static void show_version( void )
+  {
+  printf( "%s %s\n", program_name, PROGVERSION );
+  printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
+  printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
+          "This is free software: you are free to change and redistribute it.\n"
+          "There is NO WARRANTY, to the extent permitted by law.\n" );
+  }
+
+
+/* assure at least a minimum size for buffer 'buf' */
+void * resize_buffer( void * buf, const unsigned min_size )
+  {
+  if( buf ) buf = realloc( buf, min_size );
+  else buf = malloc( min_size );
+  if( !buf ) { show_error( mem_msg, 0, false ); cleanup_and_fail( 1 ); }
+  return buf;
+  }
+
+
+struct Pretty_print
+  {
+  const char * name;
+  char * padded_name;
+  const char * stdin_name;
+  unsigned longest_name;
+  bool first_post;
+  };
+
+static void Pp_init( struct Pretty_print * const pp,
+                     const char * const filenames[], const int num_filenames )
+  {
+  pp->name = 0;
+  pp->padded_name = 0;
+  pp->stdin_name = "(stdin)";
+  pp->longest_name = 0;
+  pp->first_post = false;
+
+  if( verbosity <= 0 ) return;
+  const unsigned stdin_name_len = strlen( pp->stdin_name );
+  int i;
+  for( i = 0; i < num_filenames; ++i )
+    {
+    const char * const s = filenames[i];
+    const unsigned len = (strcmp( s, "-" ) == 0) ? stdin_name_len : strlen( s );
+    if( pp->longest_name < len ) pp->longest_name = len;
+    }
+  if( pp->longest_name == 0 ) pp->longest_name = stdin_name_len;
+  }
+
+static void Pp_set_name( struct Pretty_print * const pp,
+                         const char * const filename )
+  {
+  unsigned name_len, padded_name_len, i = 0;
+
+  if( filename && filename[0] && strcmp( filename, "-" ) != 0 )
+    pp->name = filename;
+  else pp->name = pp->stdin_name;
+  name_len = strlen( pp->name );
+  padded_name_len = max( name_len, pp->longest_name ) + 4;
+  pp->padded_name = resize_buffer( pp->padded_name, padded_name_len + 1 );
+  while( i < 2 ) pp->padded_name[i++] = ' ';
+  while( i < name_len + 2 ) { pp->padded_name[i] = pp->name[i-2]; ++i; }
+  pp->padded_name[i++] = ':';
+  while( i < padded_name_len ) pp->padded_name[i++] = ' ';
+  pp->padded_name[i] = 0;
+  pp->first_post = true;
+  }
+
+static void Pp_reset( struct Pretty_print * const pp )
+  { if( pp->name && pp->name[0] ) pp->first_post = true; }
+
+void Pp_show_msg( struct Pretty_print * const pp, const char * const msg )
+  {
+  if( verbosity < 0 ) return;
+  if( pp->first_post )
+    {
+    pp->first_post = false;
+    fputs( pp->padded_name, stderr );
+    if( !msg ) fflush( stderr );
+    }
+  if( msg ) fprintf( stderr, "%s\n", msg );
+  }
+
+
+const char * bad_version( const unsigned version )
+  {
+  static char buf[80];
+  snprintf( buf, sizeof buf, "Version %u member format not supported.",
+            version );
+  return buf;
+  }
+
+
+const char * format_ds( const unsigned dictionary_size )
+  {
+  enum { bufsize = 16, factor = 1024, n = 3 };
+  static char buf[bufsize];
+  const char * const prefix[n] = { "Ki", "Mi", "Gi" };
+  const char * p = "";
+  const char * np = "  ";
+  unsigned num = dictionary_size;
+  bool exact = ( num % factor == 0 );
+
+  int i; for( i = 0; i < n && ( num > 9999 || ( exact && num >= factor ) ); ++i )
+    { num /= factor; if( num % factor != 0 ) exact = false;
+      p = prefix[i]; np = ""; }
+  snprintf( buf, bufsize, "%s%4u %sB", np, num, p );
+  return buf;
+  }
+
+
+void show_header( const unsigned dictionary_size )
+  {
+  fprintf( stderr, "dict %s, ", format_ds( dictionary_size ) );
+  }
+
+
+/* separate numbers of 5 or more digits in groups of 3 digits using '_' */
+static const char * format_num3( unsigned long long num )
+  {
+  enum { buffers = 8, bufsize = 4 * sizeof num, n = 10 };
+  const char * const si_prefix = "kMGTPEZYRQ";
+  const char * const binary_prefix = "KMGTPEZYRQ";
+  static char buffer[buffers][bufsize];	/* circle of static buffers for printf */
+  static int current = 0;
+  int i;
+  char * const buf = buffer[current++]; current %= buffers;
+  char * p = buf + bufsize - 1;		/* fill the buffer backwards */
+  *p = 0;	/* terminator */
+  if( num > 1024 )
+    {
+    char prefix = 0;			/* try binary first, then si */
+    for( i = 0; i < n && num != 0 && num % 1024 == 0; ++i )
+      { num /= 1024; prefix = binary_prefix[i]; }
+    if( prefix ) *(--p) = 'i';
+    else
+      for( i = 0; i < n && num != 0 && num % 1000 == 0; ++i )
+        { num /= 1000; prefix = si_prefix[i]; }
+    if( prefix ) *(--p) = prefix;
+    }
+  const bool split = num >= 10000;
+
+  for( i = 0; ; )
+    {
+    *(--p) = num % 10 + '0'; num /= 10; if( num == 0 ) break;
+    if( split && ++i >= 3 ) { i = 0; *(--p) = '_'; }
+    }
+  return p;
+  }
+
+
+void show_option_error( const char * const arg, const char * const msg,
+                        const char * const option_name )
+  {
+  if( verbosity >= 0 )
+    fprintf( stderr, "%s: '%s': %s option '%s'.\n",
+             program_name, arg, msg, option_name );
+  }
+
+
+/* Recognized formats: <num>k, <num>Ki, <num>[MGTPEZYRQ][i] */
+static unsigned long getnum( const char * const arg,
+                             const char * const option_name,
+                             const unsigned long llimit,
+                             const unsigned long ulimit )
+  {
+  char * tail;
+  errno = 0;
+  unsigned long result = strtoul( arg, &tail, 0 );
+  if( tail == arg )
+    { show_option_error( arg, "Bad or missing numerical argument in",
+                         option_name ); exit( 1 ); }
+
+  if( !errno && tail[0] )
+    {
+    const unsigned factor = ( tail[1] == 'i' ) ? 1024 : 1000;
+    int exponent = 0;				/* 0 = bad multiplier */
+    int i;
+    switch( tail[0] )
+      {
+      case 'Q': exponent = 10; break;
+      case 'R': exponent = 9; 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; break;
+      case 'k': if( factor == 1000 ) exponent = 1; break;
+      }
+    if( exponent <= 0 )
+      { show_option_error( arg, "Bad multiplier in numerical argument of",
+                           option_name ); exit( 1 ); }
+    for( i = 0; i < exponent; ++i )
+      {
+      if( ulimit / factor >= result ) result *= factor;
+      else { errno = ERANGE; break; }
+      }
+    }
+  if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
+  if( errno )
+    {
+    if( verbosity >= 0 )
+      fprintf( stderr, "%s: '%s': Value out of limits [%s,%s] in "
+               "option '%s'.\n", program_name, arg, format_num3( llimit ),
+               format_num3( ulimit ), option_name );
+    exit( 1 );
+    }
+  return result;
+  }
+
+
+static int get_dict_size( const char * const arg, const char * const option_name )
+  {
+  char * tail;
+  const long bits = strtol( arg, &tail, 0 );
+  if( bits >= min_dictionary_bits &&
+      bits <= max_dictionary_bits && *tail == 0 )
+    return 1 << bits;
+  return getnum( arg, option_name, min_dictionary_size, max_dictionary_size );
+  }
+
+
+static void set_mode( enum Mode * const program_modep, const enum Mode new_mode )
+  {
+  if( *program_modep != m_compress && *program_modep != new_mode )
+    {
+    show_error( "Only one operation can be specified.", 0, true );
+    exit( 1 );
+    }
+  *program_modep = new_mode;
+  }
+
+
+static int extension_index( const char * const name )
+  {
+  int eindex;
+  for( eindex = 0; known_extensions[eindex].from; ++eindex )
+    {
+    const char * const ext = known_extensions[eindex].from;
+    const unsigned name_len = strlen( name );
+    const unsigned ext_len = strlen( ext );
+    if( name_len > ext_len &&
+        strncmp( name + name_len - ext_len, ext, ext_len ) == 0 )
+      return eindex;
+    }
+  return -1;
+  }
+
+
+static void set_d_outname( const char * const name, const int eindex )
+  {
+  const unsigned name_len = strlen( name );
+  if( eindex >= 0 )
+    {
+    const char * const from = known_extensions[eindex].from;
+    const unsigned from_len = strlen( from );
+    if( name_len > from_len )
+      {
+      output_filename = resize_buffer( output_filename, name_len +
+                                       strlen( known_extensions[eindex].to ) + 1 );
+      strcpy( output_filename, name );
+      strcpy( output_filename + name_len - from_len, known_extensions[eindex].to );
+      return;
+      }
+    }
+  output_filename = resize_buffer( output_filename, name_len + 4 + 1 );
+  strcpy( output_filename, name );
+  strcat( output_filename, ".out" );
+  if( verbosity >= 1 )
+    fprintf( stderr, "%s: %s: Can't guess original name -- using '%s'\n",
+             program_name, name, output_filename );
+  }
+
+
+int open_instream( const char * const name, struct stat * const in_statsp,
+                   const bool one_to_one, const bool reg_only )
+  {
+  int infd = open( name, O_RDONLY | O_BINARY );
+  if( infd < 0 )
+    show_file_error( name, "Can't open input file", errno );
+  else
+    {
+    const int i = fstat( infd, in_statsp );
+    const mode_t mode = in_statsp->st_mode;
+    const bool can_read = ( i == 0 && !reg_only &&
+                            ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
+                              S_ISFIFO( mode ) || S_ISSOCK( mode ) ) );
+    if( i != 0 || ( !S_ISREG( mode ) && ( !can_read || one_to_one ) ) )
+      {
+      if( verbosity >= 0 )
+        fprintf( stderr, "%s: %s: Input file is not a regular file%s.\n",
+                 program_name, name, ( can_read && one_to_one ) ?
+                 ",\n  and neither '-c' nor '-o' were specified" : "" );
+      close( infd );
+      infd = -1;
+      }
+    }
+  return infd;
+  }
+
+
+static bool make_dirs( const char * const name )
+  {
+  int i = strlen( name );
+  while( i > 0 && name[i-1] != '/' ) --i;	/* remove last component */
+  while( i > 0 && name[i-1] == '/' ) --i;	/* remove slash(es) */
+  const int dirsize = i;	/* size of dirname without trailing slash(es) */
+
+  for( i = 0; i < dirsize; )	/* if dirsize == 0, dirname is '/' or empty */
+    {
+    while( i < dirsize && name[i] == '/' ) ++i;
+    const int first = i;
+    while( i < dirsize && name[i] != '/' ) ++i;
+    if( first < i )
+      {
+      char partial[i+1]; memcpy( partial, name, i ); partial[i] = 0;
+      const mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
+      struct stat st;
+      if( stat( partial, &st ) == 0 )
+        { if( !S_ISDIR( st.st_mode ) ) { errno = ENOTDIR; return false; } }
+      else if( mkdir( partial, mode ) != 0 && errno != EEXIST )
+        return false;		/* if EEXIST, another process created the dir */
+      }
+    }
+  return true;
+  }
+
+
+static bool open_outstream( const bool force, const bool protect )
+  {
+  const mode_t usr_rw = S_IRUSR | S_IWUSR;
+  const mode_t all_rw = usr_rw | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+  const mode_t outfd_mode = protect ? usr_rw : all_rw;
+  int flags = O_APPEND | O_CREAT | O_RDWR | O_BINARY;
+  if( force ) flags |= O_TRUNC; else flags |= O_EXCL;
+
+  outfd = -1;
+  const int len = strlen( output_filename );
+  if( len > 0 && output_filename[len-1] == '/' ) errno = EISDIR;
+  else {
+    if( !protect && !make_dirs( output_filename ) )
+      { show_file_error( output_filename,
+          "Error creating intermediate directory", errno ); return false; }
+    outfd = open( output_filename, flags, outfd_mode );
+    if( outfd >= 0 ) { delete_output_on_interrupt = true; return true; }
+    if( errno == EEXIST )
+      { show_file_error( output_filename,
+          "Output file already exists, skipping.", 0 ); return false; }
+    }
+  show_file_error( output_filename, "Can't create output file", errno );
+  return false;
+  }
+
+
+static void set_signals( void (*action)(int) )
+  {
+  signal( SIGHUP, action );
+  signal( SIGINT, action );
+  signal( SIGTERM, action );
+  }
+
+
+void cleanup_and_fail( const int retval )
+  {
+  set_signals( SIG_IGN );			/* ignore signals */
+  if( delete_output_on_interrupt )
+    {
+    delete_output_on_interrupt = false;
+    show_file_error( output_filename, "Deleting output file, if it exists.", 0 );
+    if( outfd >= 0 ) { close( outfd ); outfd = -1; }
+    if( remove( output_filename ) != 0 && errno != ENOENT )
+      show_error( "warning: deletion of output file failed", errno, false );
+    }
+  exit( retval );
+  }
+
+
+static void signal_handler( int sig )
+  {
+  if( sig ) {}				/* keep compiler happy */
+  show_error( "Control-C or similar caught, quitting.", 0, false );
+  cleanup_and_fail( 1 );
+  }
+
+
+static bool check_tty_in( const char * const input_filename, const int infd,
+                          const enum Mode program_mode, int * const retval )
+  {
+  if( isatty( infd ) )				/* for example /dev/tty */
+    { show_file_error( input_filename,
+                       "I won't read compressed data from a terminal.", 0 );
+      close( infd ); set_retval( retval, 2 );
+      if( program_mode != m_test ) cleanup_and_fail( *retval );
+      return false; }
+  return true;
+  }
+
+
+/* Set permissions, owner, and times. */
+static void close_and_set_permissions( const struct stat * const in_statsp )
+  {
+  bool warning = false;
+  if( in_statsp )
+    {
+    const mode_t mode = in_statsp->st_mode;
+    /* fchown in many cases returns with EPERM, which can be safely ignored. */
+    if( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) == 0 )
+      { if( fchmod( outfd, mode ) != 0 ) warning = true; }
+    else
+      if( errno != EPERM ||
+          fchmod( outfd, mode & ~( S_ISUID | S_ISGID | S_ISVTX ) ) != 0 )
+        warning = true;
+    }
+  if( close( outfd ) != 0 )
+    { show_file_error( output_filename, "Error closing output file", errno );
+      cleanup_and_fail( 1 ); }
+  outfd = -1;
+  delete_output_on_interrupt = false;
+  if( in_statsp )
+    {
+    struct utimbuf t;
+    t.actime = in_statsp->st_atime;
+    t.modtime = in_statsp->st_mtime;
+    if( utime( output_filename, &t ) != 0 ) warning = true;
+    }
+  if( warning && verbosity >= 1 )
+    show_file_error( output_filename,
+                     "warning: can't change output file attributes", errno );
+  }
+
+
+static unsigned char xdigit( const unsigned value )	/* hex digit for 'value' */
+  {
+  if( value <= 9 ) return '0' + value;
+  if( value <= 15 ) return 'A' + value - 10;
+  return 0;
+  }
+
+
+static bool show_trailing_data( const uint8_t * const data, const int size,
+                                struct Pretty_print * const pp, const bool all,
+                                const int ignore_trailing )	/* -1 = show */
+  {
+  if( verbosity >= 4 || ignore_trailing <= 0 )
+    {
+    int i;
+    char buf[80];
+    unsigned len = max( 0, snprintf( buf, sizeof buf, "%strailing data = ",
+                                     all ? "" : "first bytes of " ) );
+    for( i = 0; i < size && len + 2 < sizeof buf; ++i )
+      {
+      buf[len++] = xdigit( data[i] >> 4 );
+      buf[len++] = xdigit( data[i] & 0x0F );
+      buf[len++] = ' ';
+      }
+    if( len < sizeof buf ) buf[len++] = '\'';
+    for( i = 0; i < size && len < sizeof buf; ++i )
+      { if( isprint( data[i] ) ) buf[len++] = data[i]; else buf[len++] = '.'; }
+    if( len < sizeof buf ) buf[len++] = '\'';
+    if( len < sizeof buf ) buf[len] = 0; else buf[sizeof buf - 1] = 0;
+    Pp_show_msg( pp, buf );
+    if( ignore_trailing == 0 ) show_file_error( pp->name, trailing_msg, 0 );
+    }
+  return ignore_trailing > 0;
+  }
+
+
+static int decompress( const unsigned long long cfile_size, const int infd,
+                       const struct Cl_options * const cl_opts,
+                       struct Pretty_print * const pp,
+                       const unsigned buffer_size, const bool testing )
+  {
+  unsigned long long partial_file_pos = 0;
+  struct Range_decoder rdec;
+  int retval = 0;
+  bool first_member;
+  if( !Rd_init( &rdec, infd ) )
+    { show_error( mem_msg, 0, false ); cleanup_and_fail( 1 ); }
+
+  for( first_member = true; ; first_member = false )
+    {
+    Lzip_header header;
+    Rd_reset_member_position( &rdec );
+    const int size = Rd_read_data( &rdec, header, Lh_size );
+    if( Rd_finished( &rdec ) )			/* End Of File */
+      {
+      if( first_member )
+        { show_file_error( pp->name, "File ends unexpectedly at member header.", 0 );
+          retval = 2; }
+      else if( Lh_check_prefix( header, size ) )
+        { Pp_show_msg( pp, "Truncated header in multimember file." );
+          show_trailing_data( header, size, pp, true, -1 ); retval = 2; }
+      else if( size > 0 && !show_trailing_data( header, size, pp, true,
+                                 cl_opts->ignore_trailing ) ) retval = 2;
+      break;
+      }
+    if( !Lh_check_magic( header ) )
+      {
+      if( first_member )
+        { show_file_error( pp->name, bad_magic_msg, 0 ); retval = 2; }
+      else if( !cl_opts->loose_trailing && Lh_check_corrupt( header ) )
+        { Pp_show_msg( pp, corrupt_mm_msg );
+          show_trailing_data( header, size, pp, false, -1 ); retval = 2; }
+      else if( !show_trailing_data( header, size, pp, false,
+                                    cl_opts->ignore_trailing ) ) retval = 2;
+      break;
+      }
+    if( !Lh_check_version( header ) )
+      { Pp_show_msg( pp, bad_version( Lh_version( header ) ) );
+        retval = 2; break; }
+    const unsigned dictionary_size = Lh_get_dictionary_size( header );
+    if( !isvalid_ds( dictionary_size ) )
+      { Pp_show_msg( pp, bad_dict_msg ); retval = 2; break; }
+
+    if( verbosity >= 2 || ( verbosity == 1 && first_member ) )
+      Pp_show_msg( pp, 0 );
+
+    struct LZ_decoder decoder;
+    if( !LZd_init( &decoder, &rdec, buffer_size, dictionary_size, outfd ) )
+      {
+      Pp_show_msg( pp, "Not enough memory. Try a smaller output buffer size." );
+      retval = 1; break;
+      }
+    show_dprogress( cfile_size, partial_file_pos, &rdec, pp );	/* init */
+    const int result = LZd_decode_member( &decoder, cl_opts, pp );
+    partial_file_pos += Rd_member_position( &rdec );
+    LZd_free( &decoder );
+    if( result != 0 )
+      {
+      if( verbosity >= 0 && result <= 2 )
+        {
+        Pp_show_msg( pp, 0 );
+        fprintf( stderr, "%s at pos %llu\n", ( result == 2 ) ?
+                 "File ends unexpectedly" : "Decoder error",
+                 partial_file_pos );
+        }
+      else if( result == 5 ) Pp_show_msg( pp, empty_msg );
+      else if( result == 6 ) Pp_show_msg( pp, marking_msg );
+      retval = 2; break;
+      }
+    if( verbosity >= 2 )
+      { fputs( testing ? "ok\n" : "done\n", stderr ); Pp_reset( pp ); }
+    }
+  Rd_free( &rdec );
+  if( verbosity == 1 && retval == 0 )
+    fputs( testing ? "ok\n" : "done\n", stderr );
+  return retval;
+  }
+
+
+void show_error( const char * const msg, const int errcode, const bool help )
+  {
+  if( verbosity < 0 ) return;
+  if( msg && msg[0] )
+    fprintf( stderr, "%s: %s%s%s\n", program_name, msg,
+             ( errcode > 0 ) ? ": " : "",
+             ( errcode > 0 ) ? strerror( errcode ) : "" );
+  if( help )
+    fprintf( stderr, "Try '%s --help' for more information.\n",
+             invocation_name );
+  }
+
+
+void show_file_error( const char * const filename, const char * const msg,
+                      const int errcode )
+  {
+  if( verbosity >= 0 )
+    fprintf( stderr, "%s: %s: %s%s%s\n", program_name, filename, msg,
+             ( errcode > 0 ) ? ": " : "",
+             ( errcode > 0 ) ? strerror( errcode ) : "" );
+  }
+
+
+static void internal_error( const char * const msg )
+  {
+  if( verbosity >= 0 )
+    fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
+  exit( 3 );
+  }
+
+
+void show_dprogress( const unsigned long long cfile_size,
+                     const unsigned long long partial_size,
+                     const struct Range_decoder * const d,
+                     struct Pretty_print * const p )
+  {
+  static unsigned long long csize = 0;		/* file_size / 100 */
+  static unsigned long long psize = 0;
+  static const struct Range_decoder * rdec = 0;
+  static struct Pretty_print * pp = 0;
+  static int counter = 0;
+  static bool enabled = true;
+
+  if( !enabled ) return;
+  if( p )					/* initialize static vars */
+    {
+    if( verbosity < 2 || !isatty( STDERR_FILENO ) ) { enabled = false; return; }
+    csize = cfile_size; psize = partial_size; rdec = d; pp = p; counter = 0;
+    }
+  if( rdec && pp && --counter <= 0 )
+    {
+    const unsigned long long pos = psize + Rd_member_position( rdec );
+    counter = 7;		/* update display every 114688 bytes */
+    if( csize > 0 )
+      fprintf( stderr, "%4llu%%  %.1f MB\r", pos / csize, pos / 1000000.0 );
+    else
+      fprintf( stderr, "  %.1f MB\r", pos / 1000000.0 );
+    Pp_reset( pp ); Pp_show_msg( pp, 0 );	/* restore cursor position */
+    }
+  }
+
+
+int main( const int argc, const char * const argv[] )
+  {
+  const char * default_output_filename = "";
+  unsigned buffer_size = max_dictionary_size;
+  enum Mode program_mode = m_compress;
+  int i;
+  struct Cl_options cl_opts;		/* command-line options */
+  Cl_options_init( &cl_opts );
+  bool force = false;
+  bool keep_input_files = false;
+  bool to_stdout = false;
+  if( argc > 0 ) invocation_name = argv[0];
+
+  enum { opt_eer = 256, opt_lt, opt_mer };
+  const struct ap_Option options[] =
+    {
+    { 'a', "trailing-error",     ap_no  },
+    { 'c', "stdout",             ap_no  },
+    { 'd', "decompress",         ap_no  },
+    { 'f', "force",              ap_no  },
+    { 'h', "help",               ap_no  },
+    { 'k', "keep",               ap_no  },
+    { 'l', "list",               ap_no  },
+    { 'n', "threads",            ap_yes },
+    { 'o', "output",             ap_yes },
+    { 'q', "quiet",              ap_no  },
+    { 't', "test",               ap_no  },
+    { 'u', "buffer-size",        ap_yes },
+    { 'v', "verbose",            ap_no  },
+    { 'V', "version",            ap_no  },
+    { opt_eer, "empty-error",    ap_no  },
+    { opt_lt,  "loose-trailing", ap_no  },
+    { opt_mer, "marking-error",  ap_no  },
+    {  0, 0,                     ap_no  } };
+
+  CRC32_init();
+
+  /* static because valgrind complains and memory management in C sucks */
+  static struct Arg_parser parser;
+  if( !ap_init( &parser, argc, argv, options, 0 ) )
+    { show_error( mem_msg, 0, false ); return 1; }
+  if( ap_error( &parser ) )				/* bad option */
+    { show_error( ap_error( &parser ), 0, true ); return 1; }
+
+  int argind = 0;
+  for( ; argind < ap_arguments( &parser ); ++argind )
+    {
+    const int code = ap_code( &parser, argind );
+    if( !code ) break;					/* no more options */
+    const char * const pn = ap_parsed_name( &parser, argind );
+    const char * const arg = ap_argument( &parser, argind );
+    switch( code )
+      {
+      case 'a': cl_opts.ignore_trailing = false; break;
+      case 'c': to_stdout = true; break;
+      case 'd': set_mode( &program_mode, m_decompress ); break;
+      case 'f': force = true; break;
+      case 'h': show_help(); return 0;
+      case 'k': keep_input_files = true; break;
+      case 'l': set_mode( &program_mode, m_list ); break;
+      case 'n': break;
+      case 'o': if( strcmp( arg, "-" ) == 0 ) to_stdout = true;
+                else { default_output_filename = arg; } break;
+      case 'q': verbosity = -1; break;
+      case 't': set_mode( &program_mode, m_test ); break;
+      case 'u': buffer_size = get_dict_size( arg, pn ); break;
+      case 'v': if( verbosity < 4 ) ++verbosity; break;
+      case 'V': show_version(); return 0;
+      case opt_eer: cl_opts.ignore_empty = false; break;
+      case opt_lt:  cl_opts.loose_trailing = true; break;
+      case opt_mer: cl_opts.ignore_marking = false; break;
+      default: internal_error( "uncaught option." );
+      }
+    } /* end process options */
+
+#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__
+  setmode( STDIN_FILENO, O_BINARY );
+  setmode( STDOUT_FILENO, O_BINARY );
+#endif
+
+  static const char ** filenames = 0;
+  int num_filenames = max( 1, ap_arguments( &parser ) - argind );
+  filenames = resize_buffer( filenames, num_filenames * sizeof filenames[0] );
+  filenames[0] = "-";
+
+  bool filenames_given = false;
+  for( i = 0; argind + i < ap_arguments( &parser ); ++i )
+    {
+    filenames[i] = ap_argument( &parser, argind + i );
+    if( strcmp( filenames[i], "-" ) != 0 ) filenames_given = true;
+    }
+
+  if( program_mode == m_list )
+    return list_files( filenames, num_filenames, &cl_opts );
+
+  if( program_mode == m_compress )
+    program_mode = m_decompress;			/* default mode */
+  if( program_mode == m_test ) to_stdout = false;	/* apply overrides */
+  if( program_mode == m_test || to_stdout ) default_output_filename = "";
+
+  if( buffer_size < max_dictionary_size )
+    {
+    bool from_stdin = false;
+    if( to_stdout || program_mode == m_test )
+      { show_error( "'--buffer-size' is incompatible with '--stdout' and '--test'.",
+                    0, false ); return 1; }
+    for( i = 0; i < num_filenames; ++i )
+      if( !filenames[i][0] || strcmp( filenames[i], "-" ) == 0 )
+        { from_stdin = true; break; }
+    if( from_stdin && !default_output_filename[0] )
+      { show_error( "Output file must be specified when decompressing from standard input\n"
+                    "        with a reduced buffer size.", 0, false ); return 1; }
+    }
+
+  output_filename = resize_buffer( output_filename, 1 );
+  output_filename[0] = 0;
+  if( to_stdout && program_mode != m_test ) outfd = STDOUT_FILENO;
+  else outfd = -1;
+
+  const bool to_file = !to_stdout && program_mode != m_test &&
+                       default_output_filename[0];
+  if( !to_stdout && program_mode != m_test && ( filenames_given || to_file ) )
+    set_signals( signal_handler );
+
+  static struct Pretty_print pp;
+  Pp_init( &pp, filenames, num_filenames );
+
+  int failed_tests = 0;
+  int retval = 0;
+  const bool one_to_one = !to_stdout && program_mode != m_test && !to_file;
+  bool stdin_used = false;
+  struct stat in_stats;
+  for( i = 0; i < num_filenames; ++i )
+    {
+    const char * input_filename = "";
+    int infd;
+
+    Pp_set_name( &pp, filenames[i] );
+    if( strcmp( filenames[i], "-" ) == 0 )
+      {
+      if( stdin_used ) continue; else stdin_used = true;
+      infd = STDIN_FILENO;
+      if( !check_tty_in( pp.name, infd, program_mode, &retval ) ) continue;
+      if( one_to_one ) { outfd = STDOUT_FILENO; output_filename[0] = 0; }
+      }
+    else
+      {
+      input_filename = filenames[i];
+      infd = open_instream( input_filename, &in_stats, one_to_one, false );
+      if( infd < 0 ) { set_retval( &retval, 1 ); continue; }
+      if( !check_tty_in( pp.name, infd, program_mode, &retval ) ) continue;
+      if( one_to_one )			/* open outfd after checking infd */
+        {
+        set_d_outname( input_filename, extension_index( input_filename ) );
+        if( !open_outstream( force, true ) )
+          { close( infd ); set_retval( &retval, 1 ); continue; }
+        }
+      }
+
+    if( to_file && outfd < 0 )		/* open outfd after checking infd */
+      {
+      output_filename = resize_buffer( output_filename,
+                        strlen( default_output_filename ) + 1 );
+      strcpy( output_filename, default_output_filename );
+      if( !open_outstream( force, false ) ) return 1;
+      }
+
+    if( delete_output_on_interrupt && buffer_size < max_dictionary_size )
+      {
+      struct stat st;
+      if( fstat( outfd, &st ) != 0 || !S_ISREG( st.st_mode ) )
+        {
+        if( verbosity >= 0 )
+          fprintf( stderr, "%s: %s: Output file is not a regular file,\n"
+                   "  and 'low memory' mode has been requested.\n",
+                   program_name, output_filename );
+        set_retval( &retval, 1 );
+        return retval;		/* don't try to delete a non-regular file */
+        }
+      }
+
+    const struct stat * const in_statsp =
+      ( input_filename[0] && one_to_one ) ? &in_stats : 0;
+    const unsigned long long cfile_size =
+      ( input_filename[0] && S_ISREG( in_stats.st_mode ) ) ?
+        ( in_stats.st_size + 99 ) / 100 : 0;
+    int tmp = decompress( cfile_size, infd, &cl_opts, &pp, buffer_size,
+                          program_mode == m_test );
+    if( close( infd ) != 0 )
+      { show_file_error( pp.name, "Error closing input file", errno );
+        set_retval( &tmp, 1 ); }
+    set_retval( &retval, tmp );
+    if( tmp )
+      { if( program_mode != m_test ) cleanup_and_fail( retval );
+        else ++failed_tests; }
+
+    if( delete_output_on_interrupt && one_to_one )
+      close_and_set_permissions( in_statsp );
+    if( input_filename[0] && !keep_input_files && one_to_one )
+      remove( input_filename );
+    }
+  if( delete_output_on_interrupt )					/* -o */
+    close_and_set_permissions( ( retval == 0 && !stdin_used &&
+      filenames_given && num_filenames == 1 ) ? &in_stats : 0 );
+  else if( outfd >= 0 && close( outfd ) != 0 )				/* -c */
+    {
+    show_error( "Error closing stdout", errno, false );
+    set_retval( &retval, 1 );
+    }
+  if( failed_tests > 0 && verbosity >= 1 && num_filenames > 1 )
+    fprintf( stderr, "%s: warning: %d %s failed the test.\n",
+             program_name, failed_tests,
+             ( failed_tests == 1 ) ? "file" : "files" );
+  free( output_filename );
+  free( filenames );
+  ap_free( &parser );
+  return retval;
+  }