/*  Pdlzip - LZMA lossless data compressor
    2009-08-14 : Igor Pavlov : Public domain
    Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.

    This program is free software: you have unlimited permission
    to copy, distribute and modify it.

    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.
*/
/*
    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 invalid input file, 3 for an internal consistency error
    (eg, bug) which caused pdlzip to panic.
*/

#define _FILE_OFFSET_BITS 64

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utime.h>
#include <sys/stat.h>
#if defined(__MSVCRT__)
#include <io.h>
#define fchmod(x,y) 0
#define fchown(x,y,z) 0
#define SIGHUP SIGTERM
#define S_ISSOCK(x) 0
#define S_IRGRP 0
#define S_IWGRP 0
#define S_IROTH 0
#define S_IWOTH 0
#endif
#if defined(__OS2__)
#include <io.h>
#endif

#include "carg_parser.h"
#include "lzip.h"
#include "LzmaDec.h"
#include "LzmaEnc.h"

#if CHAR_BIT != 8
#error "Environments where CHAR_BIT != 8 are not supported."
#endif


const char * const Program_name = "Pdlzip";
const char * const program_name = "pdlzip";
const char * const program_year = "2013";
const char * invocation_name = 0;

#ifdef O_BINARY
const int o_binary = O_BINARY;
#else
const int o_binary = 0;
#endif

struct { const char * from; const char * to; } const known_extensions[] = {
  { ".lz",   ""     },
  { ".tlz",  ".tar" },
  { ".lzma", ""     },
  { 0,       0      } };

struct Lzma_options
  {
  int dictionary_size;		/* 4 KiB .. 512 MiB */
  int match_len_limit;		/* 5 .. 273 */
  };

enum Mode { m_compress, m_decompress, m_test };

char * output_filename = 0;
int outfd = -1;
int verbosity = 0;
const mode_t usr_rw = S_IRUSR | S_IWUSR;
const mode_t all_rw = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
mode_t outfd_mode = S_IRUSR | S_IWUSR;
bool delete_output_on_interrupt = false;


static void show_help( void )
  {
  printf( "%s - A \"public domain\" version of the lzip data compressor\n", Program_name );
  printf( "also able to decompress legacy lzma-alone (.lzma) files.\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"
          "  -c, --stdout                   send output to standard output\n"
          "  -d, --decompress               decompress\n"
          "  -f, --force                    overwrite existing output files\n"
          "  -F, --recompress               force recompression of compressed files\n"
          "  -k, --keep                     keep (don't delete) input files\n"
          "  -m, --match-length=<bytes>     set match length limit in bytes [36]\n"
          "  -o, --output=<file>            if reading stdin, place the output into <file>\n"
          "  -q, --quiet                    suppress all messages\n"
          "  -s, --dictionary-size=<bytes>  set dictionary size limit in bytes [8 MiB]\n"
          "  -t, --test                     test compressed file integrity\n"
          "  -v, --verbose                  be verbose (a 2nd -v gives more)\n"
          "  -1 .. -9                       set compression level [default 6]\n"
          "      --fast                     alias for -1\n"
          "      --best                     alias for -9\n"
          "If no file names are given, pdlzip compresses or 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"
          "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"
          "\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"
          "caused pdlzip to panic.\n"
          "\nReport bugs to lzip-bug@nongnu.org\n"
          "Pdlzip home page: http://www.nongnu.org/lzip/pdlzip.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( "Public Domain 2009 Igor Pavlov.\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" );
  }


static const char * format_num( unsigned num )
  {
  const char * const prefix[8] =
    { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
  enum { buf_size = 16, factor = 1024 };
  static char buf[buf_size];
  const char * p = "";
  bool exact = ( num % factor == 0 );
  int i;

  for( i = 0; i < 8 && ( num > 9999 || ( exact && num >= factor ) ); ++i )
    { num /= factor; if( num % factor != 0 ) exact = false; p = prefix[i]; }
  snprintf( buf, buf_size, "%u %s", num, p );
  return buf;
  }


static void show_header( const File_header header )
  {
  const char * const prefix[8] =
    { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
  enum { factor = 1024 };
  const char * p = "";
  const char * np = "  ";
  unsigned num = Fh_get_dictionary_size( header ), i;
  bool exact = ( num % factor == 0 );

  for( i = 0; i < 8 && ( num > 9999 || ( exact && num >= factor ) ); ++i )
    { num /= factor; if( num % factor != 0 ) exact = false;
      p = prefix[i]; np = ""; }
  fprintf( stderr, "dictionary size %s%4u %sB.  ", np, num, p );
  }


static unsigned long getnum( const char * const ptr,
                             const unsigned long llimit,
                             const unsigned long ulimit )
  {
  unsigned long result;
  char * tail;
  errno = 0;
  result = strtoul( ptr, &tail, 0 );
  if( tail == ptr )
    {
    show_error( "Bad or missing numerical argument.", 0, true );
    exit( 1 );
    }

  if( !errno && tail[0] )
    {
    int factor = ( tail[1] == 'i' ) ? 1024 : 1000;
    int exponent = 0, i;
    bool bad_multiplier = false;
    switch( tail[0] )
      {
      case ' ': 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 );
      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 )
    {
    show_error( "Numerical argument out of limits.", 0, false );
    exit( 1 );
    }
  return result;
  }


static int get_dict_size( const char * const arg )
  {
  char * tail;
  int bits = strtol( arg, &tail, 0 );
  if( bits >= min_dictionary_bits &&
      bits <= max_dictionary_bits && *tail == 0 )
    return ( 1 << bits );
  return getnum( arg, min_dictionary_size, max_dictionary_size );
  }


static int extension_index( const char * const name )
  {
  int i;
  for( i = 0; known_extensions[i].from; ++i )
    {
    const char * const ext = known_extensions[i].from;
    if( strlen( name ) > strlen( ext ) &&
        strncmp( name + strlen( name ) - strlen( ext ), ext, strlen( ext ) ) == 0 )
      return i;
    }
  return -1;
  }


static int open_instream( const char * const name, struct stat * const in_statsp,
                          const enum Mode program_mode, const int eindex,
                          const bool recompress, const bool to_stdout )
  {
  int infd = -1;
  if( program_mode == m_compress && !recompress && eindex >= 0 )
    {
    if( verbosity >= 0 )
      fprintf( stderr, "%s: Input file '%s' already has '%s' suffix.\n",
               program_name, name, known_extensions[eindex].from );
    }
  else
    {
    infd = open( name, O_RDONLY | o_binary );
    if( infd < 0 )
      {
      if( verbosity >= 0 )
        fprintf( stderr, "%s: Can't open input file '%s': %s.\n",
                 program_name, name, strerror( errno ) );
      }
    else
      {
      const int i = fstat( infd, in_statsp );
      const mode_t mode = in_statsp->st_mode;
      const bool can_read = ( i == 0 &&
                              ( S_ISBLK( mode ) || S_ISCHR( mode ) ||
                                S_ISFIFO( mode ) || S_ISSOCK( mode ) ) );
      const bool no_ofile = to_stdout || program_mode == m_test;
      if( i != 0 || ( !S_ISREG( mode ) && ( !can_read || !no_ofile ) ) )
        {
        if( verbosity >= 0 )
          fprintf( stderr, "%s: Input file '%s' is not a regular file%s.\n",
                   program_name, name,
                   ( can_read && !no_ofile ) ?
                   " and '--stdout' was not specified" : "" );
        close( infd );
        infd = -1;
        }
      }
    }
  return infd;
  }


/* assure at least a minimum size for buffer 'buf' */
static void * resize_buffer( void * buf, const int min_size )
  {
  if( buf ) buf = realloc( buf, min_size );
  else buf = malloc( min_size );
  if( !buf )
    {
    show_error( "Not enough memory.", 0, false );
    cleanup_and_fail( 1 );
    }
  return buf;
  }


static void set_c_outname( const char * const name )
  {
  output_filename = resize_buffer( output_filename, strlen( name ) +
                                   strlen( known_extensions[0].from ) + 1 );
  strcpy( output_filename, name );
  strcat( output_filename, known_extensions[0].from );
  }


static void set_d_outname( const char * const name, const int i )
  {
  if( i >= 0 )
    {
    const char * const from = known_extensions[i].from;
    if( strlen( name ) > strlen( from ) )
      {
      output_filename = resize_buffer( output_filename, strlen( name ) +
                                       strlen( known_extensions[0].to ) + 1 );
      strcpy( output_filename, name );
      strcpy( output_filename + strlen( name ) - strlen( from ),
              known_extensions[i].to );
      return;
      }
    }
  output_filename = resize_buffer( output_filename, strlen( name ) + 4 + 1 );
  strcpy( output_filename, name );
  strcat( output_filename, ".out" );
  if( verbosity >= 1 )
    fprintf( stderr, "%s: Can't guess original name for '%s' -- using '%s'.\n",
             program_name, name, output_filename );
  }


static bool open_outstream( const bool force )
  {
  int flags = O_CREAT | O_WRONLY | o_binary;
  if( force ) flags |= O_TRUNC; else flags |= O_EXCL;

  outfd = open( output_filename, flags, outfd_mode );
  if( outfd < 0 && verbosity >= 0 )
    {
    if( errno == EEXIST )
      fprintf( stderr, "%s: Output file '%s' already exists, skipping.\n",
               program_name, output_filename );
    else
      fprintf( stderr, "%s: Can't create output file '%s': %s.\n",
               program_name, output_filename, strerror( errno ) );
    }
  return ( outfd >= 0 );
  }


static bool check_tty( const int infd, const enum Mode program_mode )
  {
  if( program_mode == m_compress && outfd >= 0 && isatty( outfd ) )
    {
    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( infd ) )
    {
    show_error( "I won't read compressed data from a terminal.", 0, true );
    return false;
    }
  return true;
  }


void cleanup_and_fail( const int retval )
  {
  if( delete_output_on_interrupt )
    {
    delete_output_on_interrupt = false;
    if( verbosity >= 0 )
      fprintf( stderr, "%s: Deleting output file '%s', if it exists.\n",
               program_name, output_filename );
    if( outfd >= 0 ) { close( outfd ); outfd = -1; }
    if( remove( output_filename ) != 0 && errno != ENOENT )
      show_error( "WARNING: deletion of output file (apparently) failed.", 0, false );
    }
  exit( retval );
  }


     /* Set permissions, owner and times. */
static void close_and_set_permissions( const struct stat * const in_statsp )
  {
  bool warning = false;
  if( in_statsp )
    {
    /* fchown will in many cases return with EPERM, which can be safely ignored. */
    if( ( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) != 0 &&
          errno != EPERM ) ||
        fchmod( outfd, in_statsp->st_mode ) != 0 ) warning = true;
    }
  if( close( outfd ) != 0 ) 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_error( "Can't change output file attributes.", 0, false );
  }


static int compress( const struct Lzma_options * const encoder_options,
                     const int infd, struct Pretty_print * const pp )
  {
  int retval = 0;
  CLzmaEncHandle encoder;
  File_header header;
  Fh_set_magic( header );

  if( verbosity >= 1 ) Pp_show_msg( pp, 0 );
  if( !Fh_set_dictionary_size( header, encoder_options->dictionary_size ) ||
      encoder_options->match_len_limit < min_match_len_limit ||
      encoder_options->match_len_limit > max_match_len )
    internal_error( "invalid argument to encoder" );

  encoder = LzmaEnc_Init( Fh_get_dictionary_size( header ),
                          encoder_options->match_len_limit, infd, outfd );
  if( !encoder )
    {
    Pp_show_msg( pp, "Not enough memory. Try a smaller dictionary size" );
    return 1;
    }

  if( writeblock( outfd, header, Fh_size ) != Fh_size )
    { show_error( "Can not write output file", errno, false ); retval = 1; }
  else
    if( LzmaEnc_Encode( encoder ) != 0 )
      { Pp_show_msg( pp, "Encoder error" ); retval = 1; }
  LzmaEnc_Free( encoder );
  return retval;
  }


#define IN_BUF_SIZE (1 << 16)
#define OUT_BUF_SIZE (1 << 16)

static bool read_inbuf( const int infd, uint8_t inBuf[],
                        int * const inPos, int * const inSize )
  {
  int rest;
  if( *inPos >= *inSize ) *inSize = 0;
  else if( *inPos > 0 )
    {
    memmove( inBuf, inBuf + *inPos, *inSize - *inPos );
    *inSize -= *inPos;
    }
  *inPos = 0;
  rest = IN_BUF_SIZE - *inSize;
  if( rest > 0 )
    {
    const int rd = readblock( infd, inBuf + *inSize, rest );
    if( rd < rest && errno )
      { show_error( "Read error", errno, false ); return false; }
    *inSize += rd;
    }
  return true;
  }


/* 5 bytes of LZMA properties and 8 bytes of uncompressed size */
enum { lzma_header_size = LZMA_PROPS_SIZE + 8 };

static int lzma_decode( uint64_t unpackSize, CLzmaDec *decoder, const int infd,
                        uint8_t inBuf[], int * const inPos,
                        int * const inSize, const bool testing )
  {
  unsigned long long total_in = lzma_header_size, total_out = 0;
  uint8_t outBuf[OUT_BUF_SIZE];
  int outPos = 0;
  const bool thereIsSize = (unpackSize != (uint64_t)-1);

  for (;;)
    {
    uint32_t inProcessed;
    uint32_t outProcessed = OUT_BUF_SIZE - outPos;
    ELzmaFinishMode finishMode = LZMA_FINISH_ANY;
    ELzmaStatus status;

    if( *inPos >= *inSize && !read_inbuf( infd, inBuf, inPos, inSize ) )
      return 1;
    inProcessed = *inSize - *inPos;
    if (thereIsSize && outProcessed > unpackSize)
      {
      outProcessed = unpackSize;
      finishMode = LZMA_FINISH_END;
      }

    if( !LzmaDec_DecodeToBuf( decoder, outBuf + outPos, &outProcessed,
        inBuf + *inPos, &inProcessed, finishMode, &status ) )
      { show_error( "Data error.", 0, false ); return 2; }
    *inPos += inProcessed;
    total_in += inProcessed;
    outPos += outProcessed;
    unpackSize -= outProcessed;

    if( outfd >= 0 && writeblock( outfd, outBuf, outPos ) != outPos )
      { show_error( "Can not write output file", errno, false ); return 1; }

    total_out += outPos;
    outPos = 0;

    if( ( inProcessed == 0 && outProcessed == 0 ) ||
        ( thereIsSize && unpackSize == 0 ) )
      {
      if( ( thereIsSize && unpackSize != 0 ) ||
          ( !thereIsSize && status != LZMA_STATUS_FINISHED_WITH_MARK ) )
        { show_error( "Data error.", 0, false ); return 2; }
      if( verbosity >= 2 )
        fprintf( stderr, "lzma-alone, dictionary size %7sB.  ",
                 format_num( decoder->dicBufSize ) );
      if( verbosity >= 3 )
        fprintf( stderr, "uncompressed size %9llu, compressed size %8llu.  ",
                 total_out, total_in );
      if( verbosity >= 1 )
        fprintf( stderr, testing ? "(apparently) ok\n" : "(apparently) done\n" );
      return 0;
      }
    }
  }


static int lzip_decode( CLzmaDec *decoder, const int infd, uint8_t inBuf[],
                        int * const inPos, int * const inSize )
  {
  unsigned long long total_in = Fh_size, total_out = 0;
  uint8_t outBuf[OUT_BUF_SIZE];
  int outPos = 0;
  uint32_t crc = 0xFFFFFFFFU;

  for (;;)
    {
    uint32_t inProcessed;
    uint32_t outProcessed = OUT_BUF_SIZE - outPos;
    ELzmaFinishMode finishMode = LZMA_FINISH_ANY;
    ELzmaStatus status;

    if( *inPos >= *inSize && !read_inbuf( infd, inBuf, inPos, inSize ) )
      return 1;
    if( *inPos >= *inSize )
      { show_error( "Unexpected EOF.", 0, false ); return 2; }
    inProcessed = *inSize - *inPos;

    if( !LzmaDec_DecodeToBuf( decoder, outBuf + outPos, &outProcessed,
        inBuf + *inPos, &inProcessed, finishMode, &status ) )
      { show_error( "Data error.", 0, false ); return 2; }
    *inPos += inProcessed;
    total_in += inProcessed;
    outPos += outProcessed;

    if( outfd >= 0 && writeblock( outfd, outBuf, outPos ) != outPos )
      { show_error( "Can not write output file", errno, false ); return 1; }

    CRC32_update_buf( &crc, outBuf, outPos );
    total_out += outPos;
    outPos = 0;

    if (inProcessed == 0 && outProcessed == 0)
      {
      File_trailer trailer;
      int i;
      bool error = false;

      if( status != LZMA_STATUS_FINISHED_WITH_MARK )
        { show_error( "Data error.", 0, false ); return 2; }
      if( *inSize - *inPos < Ft_size &&
          !read_inbuf( infd, inBuf, inPos, inSize ) ) return 1;
      if( *inSize - *inPos < Ft_size )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "Trailer truncated at trailer position %u;"
                           " some checks may fail.\n",
                           (unsigned)(*inSize - *inPos) );
        for( i = *inSize - *inPos; i < Ft_size; ++i )
          inBuf[*inPos+i] = 0;
        }
      for( i = 0; i < Ft_size; ++i )
        trailer[i] = inBuf[(*inPos)++];
      total_in += Ft_size;
      if( Ft_get_data_crc( trailer ) != ( crc ^ 0xFFFFFFFFU ) )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "CRC mismatch; trailer says %08X, data crc is %08X.\n",
                   Ft_get_data_crc( trailer ), crc ^ 0xFFFFFFFFU );
        }
      if( Ft_get_data_size( trailer ) != total_out )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "Data size mismatch; trailer says %llu, data size is %llu (0x%llX).\n",
                   Ft_get_data_size( trailer ), total_out, total_out );
        }
      if( Ft_get_member_size( trailer ) != total_in )
        {
        error = true;
        if( verbosity >= 0 )
          fprintf( stderr, "Member size mismatch; trailer says %llu, member size is %llu (0x%llX).\n",
                   Ft_get_member_size( trailer ), total_in, total_in );
        }
      if( !error && verbosity >= 2 && total_out > 0 && total_in > 0 )
        fprintf( stderr, "%6.3f:1, %6.3f bits/byte, %5.2f%% saved.  ",
                 (double)total_out / total_in,
                 ( 8.0 * total_in ) / total_out,
                 100.0 * ( 1.0 - ( (double)total_in / total_out ) ) );
      if( !error && verbosity >= 4 )
        fprintf( stderr, "data CRC %08X, data size %9llu, member size %8llu.  ",
                 Ft_get_data_crc( trailer ),
                 Ft_get_data_size( trailer ), Ft_get_member_size( trailer ) );
      if( error ) return 2;
      return 0;
      }
    }
  }


static int decompress( const int infd, struct Pretty_print * const pp,
                       const bool testing )
  {
  uint64_t unpackSize = 0;
  CLzmaDec decoder;
  uint8_t inBuf[IN_BUF_SIZE];
  int inPos = 0, inSize = 0;
  int retval = 0;
  bool lzip_mode = true;
  bool first_member;
  uint8_t raw_props[lzma_header_size];

  for( first_member = true; ; first_member = false )
    {
    int i;
    File_header header;
    if( inSize - inPos < lzma_header_size &&
        !read_inbuf( infd, inBuf, &inPos, &inSize ) ) return 1;
    if( inSize - inPos <= Fh_size )		/* End Of File */
      {
      if( first_member )
        { Pp_show_msg( pp, "File ends unexpectedly at member header" );
          retval = 2; }
      break;
      }
    for( i = 0; i < Fh_size; ++i ) raw_props[i] = header[i] = inBuf[inPos++];
    if( !Fh_verify_magic( header ) )
      {
      if( !first_member ) break;		/* trailing garbage */
      if( inSize - inPos >= lzma_header_size - Fh_size )  /* try lzma-alone */
        {
        for( i = Fh_size; i < lzma_header_size; ++i )
          raw_props[i] = inBuf[inPos++];
        for( i = 0; i < 8; ++i )
          unpackSize += (uint64_t)raw_props[LZMA_PROPS_SIZE+i] << (i * 8);
        if( ( raw_props[12] == 0 || raw_props[12] == 0xFF ) &&
            raw_props[12] == raw_props[11] && raw_props[0] < (9 * 5 * 5) )
          lzip_mode = false;
        }
      if( lzip_mode )
        {
        Pp_show_msg( pp, "Bad magic number (file not in lzip format)" );
        retval = 2; break;
        }
      }
    if( lzip_mode )
      {
      int ds, i;
      if( !Fh_verify_version( header ) )
        {
        if( verbosity >= 0 )
          { Pp_show_msg( pp, 0 );
            fprintf( stderr, "Version %d member format not supported.\n",
                     Fh_version( header ) ); }
        retval = 2; break;
        }
      if( Fh_get_dictionary_size( header ) < min_dictionary_size ||
          Fh_get_dictionary_size( header ) > max_dictionary_size )
        { Pp_show_msg( pp, "Invalid dictionary size in member header" );
          retval = 2; break; }

      raw_props[0] = 93;		/* (45 * 2) + (9 * 0) + 3 */
      ds = Fh_get_dictionary_size( header );
      for( i = 1; i <= 4; ++i ) { raw_props[i] = ds & 0xFF; ds >>= 8; }
      }

    if( verbosity >= 2 || ( verbosity == 1 && first_member ) )
      {
      Pp_show_msg( pp, 0 );
      if( lzip_mode && verbosity >= 3 ) show_header( header );
      }

    if( !LzmaDec_Init( &decoder, raw_props ) )
      {
      show_error( "Not enough memory. Find a machine with more memory.", 0, false );
      cleanup_and_fail( 1 );
      }
    if( lzip_mode )
      retval = lzip_decode( &decoder, infd, inBuf, &inPos, &inSize );
    else
      retval = lzma_decode( unpackSize, &decoder, infd,
                            inBuf, &inPos, &inSize, testing );
    LzmaDec_Free(&decoder);
    if( retval != 0 || !lzip_mode ) break;
    if( verbosity >= 2 )
      { fprintf( stderr, testing ? "ok\n" : "done\n" ); Pp_reset( pp ); }
    }
  if( lzip_mode && verbosity == 1 && retval == 0 )
    fprintf( stderr, testing ? "ok\n" : "done\n" );
  return retval;
  }


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 void set_signals( void )
  {
  signal( SIGHUP, signal_handler );
  signal( SIGINT, signal_handler );
  signal( SIGTERM, signal_handler );
  }


void Pp_init( struct Pretty_print * const pp, const char * const filenames[],
              const int num_filenames )
  {
  unsigned stdin_name_len;
  int i;
  pp->name = 0;
  pp->stdin_name = "(stdin)";
  pp->longest_name = 0;
  pp->first_post = false;
  stdin_name_len = strlen( pp->stdin_name );

  for( i = 0; i < num_filenames; ++i )
    {
    const char * const s = filenames[i];
    const int len = ( (strcmp( s, "-" ) == 0) ? stdin_name_len : strlen( s ) );
    if( len > pp->longest_name ) pp->longest_name = len;
    }
  if( pp->longest_name == 0 ) pp->longest_name = stdin_name_len;
  }


void Pp_show_msg( struct Pretty_print * const pp, const char * const msg )
  {
  if( verbosity >= 0 )
    {
    if( pp->first_post )
      {
      int i, len;
      pp->first_post = false;
      fprintf( stderr, "  %s: ", pp->name );
      len = pp->longest_name - strlen( pp->name );
      for( i = 0; i < len; ++i ) fprintf( stderr, " " );
      if( !msg ) fflush( stderr );
      }
    if( msg ) fprintf( stderr, "%s.\n", msg );
    }
  }


void show_error( const char * const msg, const int errcode, const bool help )
  {
  if( verbosity >= 0 )
    {
    if( msg && msg[0] )
      {
      fprintf( stderr, "%s: %s", program_name, msg );
      if( errcode > 0 ) fprintf( stderr, ": %s", strerror( errcode ) );
      fprintf( stderr, "\n" );
      }
    if( help )
      fprintf( stderr, "Try '%s --help' for more information.\n",
               invocation_name );
    }
  }


void internal_error( const char * const msg )
  {
  if( verbosity >= 0 )
    fprintf( stderr, "%s: internal error: %s.\n", program_name, msg );
  exit( 3 );
  }


int main( const int argc, const char * const argv[] )
  {
  /* Mapping from gzip/bzip2 style 1..9 compression modes
     to the corresponding LZMA compression modes. */
  const struct Lzma_options option_mapping[] =
    {
    { 1 << 20,   5 },		/* -0 */
    { 1 << 20,   5 },		/* -1 */
    { 3 << 19,   6 },		/* -2 */
    { 1 << 21,   8 },		/* -3 */
    { 3 << 20,  12 },		/* -4 */
    { 1 << 22,  20 },		/* -5 */
    { 1 << 23,  36 },		/* -6 */
    { 1 << 24,  68 },		/* -7 */
    { 3 << 23, 132 },		/* -8 */
    { 1 << 25, 273 } };		/* -9 */
  struct Lzma_options encoder_options = option_mapping[6];  /* default = "-6" */
  const char * input_filename = "";
  const char * default_output_filename = "";
  const char ** filenames = 0;
  int num_filenames = 0;
  int infd = -1;
  enum Mode program_mode = m_compress;
  int argind = 0;
  int retval = 0;
  int i;
  bool filenames_given = false;
  bool force = false;
  bool keep_input_files = false;
  bool recompress = false;
  bool to_stdout = false;
  struct Pretty_print pp;

  const struct ap_Option options[] =
    {
    { '0', "fast",            ap_no  },
    { '1',  0,                ap_no  },
    { '2',  0,                ap_no  },
    { '3',  0,                ap_no  },
    { '4',  0,                ap_no  },
    { '5',  0,                ap_no  },
    { '6',  0,                ap_no  },
    { '7',  0,                ap_no  },
    { '8',  0,                ap_no  },
    { '9', "best",            ap_no  },
    { 'b', "member-size",     ap_yes },
    { 'c', "stdout",          ap_no  },
    { 'd', "decompress",      ap_no  },
    { 'f', "force",           ap_no  },
    { 'F', "recompress",      ap_no  },
    { 'h', "help",            ap_no  },
    { 'k', "keep",            ap_no  },
    { 'm', "match-length",    ap_yes },
    { 'n', "threads",         ap_yes },
    { 'o', "output",          ap_yes },
    { 'q', "quiet",           ap_no  },
    { 's', "dictionary-size", ap_yes },
    { 'S', "volume-size",     ap_yes },
    { 't', "test",            ap_no  },
    { 'v', "verbose",         ap_no  },
    { 'V', "version",         ap_no  },
    {  0 ,  0,                ap_no  } };

  struct Arg_parser parser;

  invocation_name = argv[0];
  CRC32_init();

  if( !ap_init( &parser, argc, argv, options, 0 ) )
    { show_error( "Memory exhausted.", 0, false ); return 1; }
  if( ap_error( &parser ) )				/* bad option */
    { show_error( ap_error( &parser ), 0, true ); return 1; }

  for( ; argind < ap_arguments( &parser ); ++argind )
    {
    const int code = ap_code( &parser, argind );
    const char * const arg = ap_argument( &parser, argind );
    if( !code ) break;					/* no more options */
    switch( code )
      {
      case '0':
      case '1': case '2': case '3': case '4':
      case '5': case '6': case '7': case '8': case '9':
                encoder_options = option_mapping[code-'0']; break;
      case 'b': break;
      case 'c': to_stdout = true; break;
      case 'd': program_mode = m_decompress; break;
      case 'f': force = true; break;
      case 'F': recompress = true; break;
      case 'h': show_help(); return 0;
      case 'k': keep_input_files = true; break;
      case 'm': encoder_options.match_len_limit =
                  getnum( arg, min_match_len_limit, max_match_len ); break;
      case 'n': break;
      case 'o': default_output_filename = arg; break;
      case 'q': verbosity = -1; break;
      case 's': encoder_options.dictionary_size = get_dict_size( arg );
                break;
      case 'S': 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" );
      }
    } /* end process options */

#if defined(__MSVCRT__) || defined(__OS2__)
  setmode( STDIN_FILENO, O_BINARY );
  setmode( STDOUT_FILENO, O_BINARY );
#endif

  if( program_mode == m_test )
    outfd = -1;

  num_filenames = max( 1, ap_arguments( &parser ) - argind );
  filenames = resize_buffer( filenames, num_filenames * sizeof filenames[0] );
  filenames[0] = "-";

  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( !to_stdout && program_mode != m_test &&
      ( filenames_given || default_output_filename[0] ) )
    set_signals();

  Pp_init( &pp, filenames, num_filenames );

  output_filename = resize_buffer( output_filename, 1 );
  for( i = 0; i < num_filenames; ++i )
    {
    int tmp;
    struct stat in_stats;
    const struct stat * in_statsp;
    output_filename[0] = 0;

    if( !filenames[i][0] || strcmp( filenames[i], "-" ) == 0 )
      {
      input_filename = "";
      infd = STDIN_FILENO;
      if( program_mode != m_test )
        {
        if( to_stdout || !default_output_filename[0] )
          outfd = STDOUT_FILENO;
        else
          {
          if( program_mode == m_compress )
            set_c_outname( default_output_filename );
          else
            {
            output_filename = resize_buffer( output_filename,
                                             strlen( default_output_filename ) + 1 );
            strcpy( output_filename, default_output_filename );
            }
          outfd_mode = all_rw;
          if( !open_outstream( force ) )
            {
            if( retval < 1 ) retval = 1;
            close( infd ); infd = -1;
            continue;
            }
          }
        }
      }
    else
      {
      const int eindex = extension_index( filenames[i] );
      input_filename = filenames[i];
      infd = open_instream( input_filename, &in_stats, program_mode,
                            eindex, recompress, to_stdout );
      if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; }
      if( program_mode != m_test )
        {
        if( to_stdout ) outfd = STDOUT_FILENO;
        else
          {
          if( program_mode == m_compress )
            set_c_outname( input_filename );
          else set_d_outname( input_filename, eindex );
          outfd_mode = usr_rw;
          if( !open_outstream( force ) )
            {
            if( retval < 1 ) retval = 1;
            close( infd ); infd = -1;
            continue;
            }
          }
        }
      }

    if( !check_tty( infd, program_mode ) ) return 1;

    if( output_filename[0] && !to_stdout && program_mode != m_test )
      delete_output_on_interrupt = true;
    in_statsp = input_filename[0] ? &in_stats : 0;
    Pp_set_name( &pp, input_filename );
    if( program_mode == m_compress )
      tmp = compress( &encoder_options, infd, &pp );
    else
      tmp = decompress( infd, &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 );
    if( input_filename[0] )
      {
      close( infd ); infd = -1;
      if( !keep_input_files && !to_stdout && program_mode != m_test )
        remove( input_filename );
      }
    }
  if( outfd >= 0 && close( outfd ) != 0 )
    {
    show_error( "Can't close stdout", errno, false );
    if( retval < 1 ) retval = 1;
    }
  free( output_filename );
  free( filenames );
  ap_free( &parser );
  return retval;
  }