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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-06 13:12:24 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-06 13:12:24 +0000
commit601d555ac1ead248ceae25bc94ed942df7d62f4d (patch)
treeffc132812296adc71f7c7aeac386c05f039f72d1 /main.c
parentInitial commit. (diff)
downloadlunzip-601d555ac1ead248ceae25bc94ed942df7d62f4d.tar.xz
lunzip-601d555ac1ead248ceae25bc94ed942df7d62f4d.zip
Adding upstream version 1.0~rc1.upstream/1.0_rc1
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to 'main.c')
-rw-r--r--main.c657
1 files changed, 657 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..11d733b
--- /dev/null
+++ b/main.c
@@ -0,0 +1,657 @@
+/* Lunzip - Decompressor for lzip files
+ Copyright (C) 2010 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 lunzip to panic.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <errno.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdint.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 "lunzip.h"
+#include "decoder.h"
+
+#if CHAR_BIT != 8
+#error "Environments where CHAR_BIT != 8 are not supported."
+#endif
+
+long long int llabs( long long int number );
+
+
+const char * const Program_name = "Lunzip";
+const char * const program_name = "lunzip";
+const char * const program_year = "2010";
+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" },
+ { 0, 0 } };
+
+char * output_filename = 0;
+int outfd = -1;
+int verbosity = 0;
+mode_t outfd_mode = S_IRUSR | S_IWUSR;
+bool delete_output_on_interrupt = false;
+
+
+/* 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 show_help()
+ {
+ printf( "%s - Decompressor for lzip files.\n", Program_name );
+ printf( "\nUsage: %s [options] [files]\n", invocation_name );
+ printf( "\nOptions:\n" );
+ printf( " -h, --help display this help and exit\n" );
+ printf( " -V, --version output version information and exit\n" );
+ printf( " -c, --stdout send output to standard output\n" );
+ printf( " -d, --decompress decompress\n" );
+ printf( " -f, --force overwrite existing output files\n" );
+ printf( " -k, --keep keep (don't delete) input files\n" );
+ printf( " -o, --output=<file> if reading stdin, place the output into <file>\n" );
+ printf( " -q, --quiet suppress all messages\n" );
+ printf( " -t, --test test compressed file integrity\n" );
+ printf( " -v, --verbose be verbose (a 2nd -v gives more)\n" );
+ printf( "If no file names are given, %s decompresses from standard input to\n", program_name );
+ printf( "standard output.\n" );
+ printf( "\nReport bugs to lzip-bug@nongnu.org\n" );
+ printf( "Lunzip home page: http://www.nongnu.org/lzip/lunzip.html\n" );
+ }
+
+
+static void show_version()
+ {
+ printf( "%s %s\n", Program_name, PROGVERSION );
+ printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
+ printf( "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n" );
+ printf( "This is free software: you are free to change and redistribute it.\n" );
+ printf( "There is NO WARRANTY, to the extent permitted by law.\n" );
+ }
+
+
+static const char * format_num( long long 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 = "";
+ int i;
+
+ for( i = 0; i < 8 && ( llabs( num ) > 9999 ||
+ ( llabs( num ) >= factor && num % factor == 0 ) ); ++i )
+ { num /= factor; p = prefix[i]; }
+ snprintf( buf, buf_size, "%lld %s", num, p );
+ return buf;
+ }
+
+
+static int open_instream( const char * const name,
+ struct stat * const in_statsp, const bool to_stdout )
+ {
+ int infd = -1;
+ 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 ) ) );
+ if( i != 0 || ( !S_ISREG( mode ) && ( !to_stdout || !can_read ) ) )
+ {
+ if( verbosity >= 0 )
+ fprintf( stderr, "%s: Input file `%s' is not a regular file%s.\n",
+ program_name, name,
+ ( can_read && !to_stdout ) ?
+ " and `--stdout' was not specified" : "" );
+ close( infd );
+ infd = -1;
+ }
+ }
+ return infd;
+ }
+
+
+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 void set_d_outname( const char * const name )
+ {
+ const int i = extension_index( name );
+ 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 >= 0 )
+ 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 );
+ }
+
+
+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 )
+ 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 error = false;
+ if( in_statsp )
+ {
+ if( fchmod( outfd, in_statsp->st_mode ) != 0 ||
+ ( fchown( outfd, in_statsp->st_uid, in_statsp->st_gid ) != 0 &&
+ errno != EPERM ) ) error = true;
+ /* fchown will in many cases return with EPERM, which can be safely ignored. */
+ }
+ if( close( outfd ) == 0 ) outfd = -1;
+ else cleanup_and_fail( 1 );
+ delete_output_on_interrupt = false;
+ if( !in_statsp ) return;
+ if( !error )
+ {
+ struct utimbuf t;
+ t.actime = in_statsp->st_atime;
+ t.modtime = in_statsp->st_mtime;
+ if( utime( output_filename, &t ) != 0 ) error = true;
+ }
+ if( error )
+ {
+ show_error( "Can't change output file attributes.", 0, false );
+ cleanup_and_fail( 1 );
+ }
+ }
+
+
+static int decompress( const int infd, struct Pretty_print * const pp,
+ const bool testing )
+ {
+ long long partial_file_pos = 0;
+ struct Range_decoder rdec;
+ int retval = 0, i, result;
+ bool first_member;
+ Rd_init( &rdec, infd );
+
+ for( first_member = true; ; first_member = false, Pp_reset( pp ) )
+ {
+ File_header header;
+ struct LZ_decoder decoder;
+ Rd_reset_member_position( &rdec );
+ for( i = 0; i < Fh_size; ++i )
+ header[i] = Rd_get_byte( &rdec );
+ if( Rd_finished( &rdec ) ) /* End Of File */
+ {
+ if( first_member )
+ { Pp_show_msg( pp, "Error reading member header" ); retval = 1; }
+ break;
+ }
+ if( !Fh_verify_magic( header ) )
+ {
+ if( !first_member ) break; /* trailing garbage */
+ Pp_show_msg( pp, "Bad magic number (file not in lzip format)" );
+ retval = 2; break;
+ }
+ 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; }
+
+ if( verbosity >= 1 )
+ {
+ Pp_show_msg( pp, 0 );
+ if( verbosity >= 2 )
+ fprintf( stderr, "version %d, dictionary size %7sB. ",
+ Fh_version( header ),
+ format_num( Fh_get_dictionary_size( header ) ) );
+ }
+ LZd_init( &decoder, header, &rdec, outfd );
+
+ result = LZd_decode_member( &decoder, pp );
+ partial_file_pos += Rd_member_position( &rdec );
+ LZd_free( &decoder );
+ if( result != 0 )
+ {
+ if( verbosity >= 0 && result <= 2 )
+ {
+ Pp_show_msg( pp, 0 );
+ if( result == 2 )
+ fprintf( stderr, "File ends unexpectedly at pos %lld\n",
+ partial_file_pos );
+ else
+ fprintf( stderr, "Decoder error at pos %lld\n", partial_file_pos );
+ }
+ retval = 2; break;
+ }
+ if( verbosity >= 1 )
+ { if( testing ) fprintf( stderr, "ok\n" );
+ else fprintf( stderr, "done\n" ); }
+ }
+ Rd_free( &rdec );
+ return retval;
+ }
+
+
+void signal_handler( int sig )
+ {
+ sig = 0; /* keep compiler happy */
+ show_error( "Control-C or similar caught, quitting.", 0, false );
+ cleanup_and_fail( 1 );
+ }
+
+
+static void set_signals()
+ {
+ 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, const int v )
+ {
+ unsigned int stdin_name_len;
+ int i;
+ pp->name_ = 0;
+ pp->stdin_name = "(stdin)";
+ pp->longest_name = 0;
+ pp->verbosity = v;
+ 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, "-" ) ? 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 && invocation_name && invocation_name[0] )
+ 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 );
+ }
+
+
+/* Returns the number of bytes really read.
+ If (returned value < size) and (errno == 0), means EOF was reached.
+*/
+int readblock( const int fd, uint8_t * const buf, const int size )
+ {
+ int rest = size;
+ while( true )
+ {
+ int n;
+ errno = 0;
+ if( rest <= 0 ) break;
+ 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 uint8_t * const buf, const int size )
+ {
+ int rest = size;
+ while( true )
+ {
+ int n;
+ errno = 0;
+ if( rest <= 0 ) break;
+ 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 * const argv[] )
+ {
+ const char * input_filename = "";
+ const char * default_output_filename = "";
+ const char ** filenames = 0;
+ int num_filenames = 0;
+ int infd = -1;
+ int argind = 0;
+ int retval = 0;
+ int i;
+ bool filenames_given = false;
+ bool force = false;
+ bool keep_input_files = false;
+ bool testing = false;
+ bool to_stdout = false;
+ struct Pretty_print pp;
+
+ const struct ap_Option options[] =
+ {
+ { 'c', "stdout", ap_no },
+ { 'd', "decompress", ap_no },
+ { 'f', "force", ap_no },
+ { 'h', "help", ap_no },
+ { 'k', "keep", ap_no },
+ { 'o', "output", ap_yes },
+ { 'q', "quiet", ap_no },
+ { '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 'c': to_stdout = true; break;
+ case 'd': testing = false; 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': testing = true; 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__)
+ _fsetmode( stdin, "b" );
+ _fsetmode( stdout, "b" );
+#endif
+
+ for( ; argind < ap_arguments( &parser ); ++argind )
+ {
+ if( strcmp( ap_argument( &parser, argind ), "-" ) )
+ filenames_given = true;
+ ++num_filenames;
+ filenames = resize_buffer( filenames, num_filenames * sizeof (char *) );
+ filenames[num_filenames-1] = ap_argument( &parser, argind );
+ }
+
+ if( num_filenames == 0 )
+ {
+ ++num_filenames;
+ filenames = resize_buffer( filenames, sizeof (char *) );
+ filenames[num_filenames-1] = "-";
+ }
+ if( !to_stdout && !testing &&
+ ( filenames_given || default_output_filename[0] ) )
+ set_signals();
+
+ Pp_init( &pp, filenames, num_filenames, verbosity );
+ if( testing )
+ outfd = -1;
+
+ 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], "-" ) )
+ {
+ input_filename = "";
+ infd = STDIN_FILENO;
+ if( !testing )
+ {
+ if( to_stdout || !default_output_filename[0] )
+ outfd = STDOUT_FILENO;
+ else
+ {
+ output_filename = resize_buffer( output_filename,
+ strlen( default_output_filename ) + 1 );
+ strcpy( output_filename, default_output_filename );
+ outfd_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
+ if( !open_outstream( force ) )
+ {
+ if( outfd == -1 && retval < 1 ) retval = 1;
+ close( infd ); infd = -1;
+ continue;
+ }
+ }
+ }
+ }
+ else
+ {
+ input_filename = filenames[i];
+ infd = open_instream( input_filename, &in_stats, to_stdout );
+ if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; }
+ if( !testing )
+ {
+ if( to_stdout ) outfd = STDOUT_FILENO;
+ else
+ {
+ set_d_outname( input_filename );
+ outfd_mode = S_IRUSR | S_IWUSR;
+ if( !open_outstream( force ) )
+ {
+ if( outfd == -1 && retval < 1 ) retval = 1;
+ close( infd ); infd = -1;
+ continue;
+ }
+ }
+ }
+ }
+
+ if( isatty( infd ) )
+ {
+ show_error( "I won't read compressed data from a terminal.", 0, true );
+ return 1;
+ }
+
+ if( output_filename[0] && !to_stdout && !testing )
+ delete_output_on_interrupt = true;
+ in_statsp = input_filename[0] ? &in_stats : 0;
+ Pp_set_name( &pp, input_filename );
+ tmp = decompress( infd, &pp, testing );
+ if( tmp > retval ) retval = tmp;
+ if( tmp && !testing ) 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 && !testing )
+ 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;
+ }