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+/* Zutils - A file format detector for compressed files
+ 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 zutils to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <algorithm>
+#include <cerrno>
+#include <climits>
+#include <csignal>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#include "arg_parser.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
+
+
+namespace {
+
+const char * invocation_name = 0;
+const char * const Program_name = "Zutils";
+const char * const program_name = "zutils";
+const char * const program_year = "2009";
+
+struct { const char * from; const char * to; } const known_extensions[] = {
+ { ".zf", "" },
+ { 0, 0 } };
+
+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 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 );
+ }
+ }
+
+
+void show_help() throw()
+ {
+ std::printf( "%s - A file format detector for compressed files.\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( " -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( " -o, --output=<file> if reading stdin, place the output into <file>\n" );
+ std::printf( " -q, --quiet suppress all messages\n" );
+ std::printf( " -t, --test test compressed file type\n" );
+ std::printf( " -v, --verbose be verbose (a 2nd -v gives more)\n" );
+ std::printf( "\nReport bugs to zutils-bug@nongnu.org\n" );
+ std::printf( "Zutils home page: http://www.nongnu.org/zutils/zutils.html\n" );
+ }
+
+
+void show_version() throw()
+ {
+ std::printf( "%s %s\n", Program_name, PROGVERSION );
+ 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" );
+ }
+
+
+void show_error( const char * msg, const int errcode = 0, const bool help = false ) 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 );
+ }
+
+
+const char * format_num( long long num, long long limit = 9999,
+ const int set_prefix = 0 ) throw()
+ {
+ const char * const si_prefix[8] =
+ { "k", "M", "G", "T", "P", "E", "Z", "Y" };
+ const char * const binary_prefix[8] =
+ { "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
+ static bool si = false;
+ static char buf[16];
+
+ if( set_prefix ) si = ( set_prefix > 0 );
+ const int factor = ( si ) ? 1000 : 1024;
+ const char * const *prefix = ( si ) ? si_prefix : binary_prefix;
+ const char *p = "";
+ limit = std::max( 999LL, std::min( 999999LL, limit ) );
+
+ for( int i = 0; i < 8 && ( llabs( num ) > limit ||
+ ( llabs( num ) >= factor && num % factor == 0 ) ); ++i )
+ { num /= factor; p = prefix[i]; }
+ snprintf( buf, sizeof buf, "%lld %s", num, p );
+ return buf;
+ }
+
+
+long long getnum( const char * ptr, const int bs,
+ 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 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;
+ tmp = utime( output_filename.c_str(), &t );
+ }
+ if( tmp )
+ {
+ if( tmp > *retvalp ) *retvalp = tmp;
+ show_error( "I can't change output file attributes." );
+ cleanup_and_fail( *retvalp );
+ }
+ }
+
+
+// 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 compress( const int inhandle, const Pretty_print & pp,
+ const struct stat * in_statsp, int * retvalp )
+ {
+ long long in_size = 0, out_size = 0;
+ if( verbosity >= 1 )
+ {
+ pp();
+ if( in_size <= 0 || out_size <= 0 )
+ std::fprintf( stderr, "no data compressed.\n" );
+ else
+ std::fprintf( stderr, "%6.3f:1, %6.3f bits/byte, "
+ "%5.2f%% saved, %lld in, %lld out.\n",
+ (double)in_size / out_size,
+ ( 8.0 * out_size ) / in_size,
+ 100.0 * ( 1.0 - ( (double)out_size / in_size ) ),
+ in_size, out_size );
+ }
+ return 0;
+ }
+
+
+int decompress( const int inhandle, const Pretty_print & pp )
+ {
+ if( verbosity >= 1 )
+ std::fprintf( stderr, "done\n" );
+ return 0;
+ }
+*/
+
+int test_type( const int inhandle, const Pretty_print & pp )
+ {
+ unsigned char buf[5];
+ const char * msg = 0;
+ const int size = readblock( inhandle, (char *)buf, sizeof buf );
+ if( size == (int)sizeof buf )
+ {
+ if( buf[0] == 0x1F && buf[1] == 0x8B )
+ msg = "gzip";
+ else if( buf[0] == 'B' && buf[1] == 'Z' && buf[2] == 'h' )
+ msg = "bzip2";
+ else if( buf[0] == 'L' && buf[1] == 'Z' && buf[2] == 'I' && buf[3] == 'P' )
+ msg = "lzip";
+ else if( buf[1] == '7' && buf[2] == 'z' && buf[3] == 'X' && buf[4] == 'Z' )
+ msg = "xz";
+ }
+ const int retval = ( msg ? 0 : 1 );
+ if( verbosity >= 0 )
+ {
+ if( verbosity >= 1 ) pp();
+ if( !msg ) msg = "unknown";
+ std::printf( "%s\n", msg );
+ }
+ return retval;
+ }
+
+
+extern "C" void signal_handler( int ) throw()
+ {
+ show_error( "Control-C or similar caught, quitting." );
+ cleanup_and_fail( 0 );
+ }
+
+
+void set_signals() throw()
+ {
+ signal( SIGHUP, signal_handler );
+ signal( SIGINT, signal_handler );
+ signal( SIGTERM, signal_handler );
+ }
+
+} // end namespace
+
+
+int main( const int argc, const char * argv[] )
+ {
+ 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];
+
+ const Arg_parser::Option options[] =
+ {
+ { 'c', "stdout", Arg_parser::no },
+ { 'd', "decompress", Arg_parser::no },
+ { 'f', "force", Arg_parser::no },
+ { 'h', "help", Arg_parser::no },
+ { 'k', "keep", Arg_parser::no },
+ { 'o', "output", Arg_parser::yes },
+ { 'q', "quiet", Arg_parser::no },
+ { '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 'c': to_stdout = true; break;
+ case 'd': program_mode = m_decompress; break;
+ case 'f': force = true; break;
+ case 'h': show_help(); return 0;
+ case 'k': keep_input_files = true; break;
+ case 'o': default_output_filename = arg; break;
+ case 'q': verbosity = -1; 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" );
+ }
+ }
+
+ 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 ) 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;
+ switch( program_mode )
+ {
+ case m_compress:
+ /*tmp = compress( inhandle, pp, in_statsp, &retval );*/ break;
+ case m_decompress:
+ /*tmp = decompress( inhandle, pp );*/ break;
+ case m_test:
+ tmp = test_type( inhandle, pp ); break;
+ }
+ 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 );
+ return retval;
+ }