diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 657 |
1 files changed, 657 insertions, 0 deletions
@@ -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; + } |