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Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 720 |
1 files changed, 720 insertions, 0 deletions
@@ -0,0 +1,720 @@ +/* Xlunzip - Test tool for the lunzip linux module + Copyright (C) 2016-2018 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 flags, I/O errors, etc), 2 to indicate a + corrupt or invalid input file, 3 for an internal consistency error + (eg, bug) which caused xlunzip to panic. +*/ + +#define _FILE_OFFSET_BITS 64 + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <signal.h> +#include <stdbool.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 +#ifndef S_IRGRP +#define S_IRGRP 0 +#define S_IWGRP 0 +#define S_IROTH 0 +#define S_IWOTH 0 +#endif +#endif +#if defined(__OS2__) +#include <io.h> +#endif + +#include "carg_parser.h" +#include "linux_lzip.h" +#include "linux_lunzip.h" +#include "lzip.h" + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +#if CHAR_BIT != 8 +#error "Environments where CHAR_BIT != 8 are not supported." +#endif + +int verbosity = 0; +void cleanup_and_fail( const int retval ); + +const char * const Program_name = "Xlunzip"; +const char * const program_name = "xlunzip"; +const char * const program_year = "2018"; +const char * invocation_name = 0; + +const struct { const char * from; const char * to; } known_extensions[] = { + { ".lz", "" }, + { ".tlz", ".tar" }, + { 0, 0 } }; + +char * output_filename = 0; +int infd = -1; /* needed by the fill function */ +int outfd = -1; +bool delete_output_on_interrupt = false; + + +static void show_help( void ) + { + printf( "Xlunzip is a test tool for the lzip decompression code of my lzip patch\n" + "for linux. Xlunzip is similar to lunzip, but it uses the lzip_decompress\n" + "linux module as a backend. Xlunzip tests the module for stream,\n" + "buffer-to-buffer and mixed decompression modes, including in-place\n" + "decompression (using the same buffer for input and output). You can use\n" + "xlunzip to verify that the module produces correct results when\n" + "decompressing single member files, multimember files, or the\n" + "concatenation of two or more compressed files. Xlunzip can be used with\n" + "unzcrash to test the robustness of the module to the decompression of\n" + "corrupted data.\n" + "\nNote that the in-place decompression of concatenated files can't be\n" + "guaranteed to work because an arbitrarily low compression ratio of the\n" + "last part of the data can be achieved by appending enough empty\n" + "compressed members to a file.\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 write to standard output, keep input files\n" + " -d, --decompress decompress (this is the default)\n" + " -f, --force overwrite existing output files\n" + " -I, --in-place decompress or test using only one buffer\n" + " -k, --keep keep (don't delete) input files\n" + " -o, --output=<file> if reading standard input, write to <file>\n" + " -q, --quiet suppress all messages\n" + " -t, --test test compressed file integrity\n" + " -v, --verbose be verbose (a 2nd -v gives more)\n" + "These options are ignored when --in-place is in effect:\n" + " --insize[=<size>] pre-allocate and fill inbuf [default 16 KiB]\n" + " --outsize[=<size>] pre-allocate outbuf [default 512 MiB]\n" + " --nofill do not pass a fill function; requires --insize\n" + " --noflush do not pass a flush function; requires --outsize\n" + "If no file names are given, or if a file is '-', xlunzip 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" + "\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 xlunzip to panic.\n" + "\nReport bugs to lzip-bug@nongnu.org\n" + "Xlunzip home page: http://www.nongnu.org/lzip/xlunzip.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( "Not enough memory.", 0, false ); + cleanup_and_fail( 1 ); + } + return buf; + } + + +void Pp_show_msg( struct Pretty_print * const pp, const char * const msg ) + { + if( verbosity >= 0 ) + { + if( pp->first_post ) + { + pp->first_post = false; + fputs( pp->padded_name, stderr ); + if( !msg ) fflush( stderr ); + } + if( msg ) fprintf( stderr, "%s\n", msg ); + } + } + + +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] ) + { + const unsigned factor = ( tail[1] == 'i' ) ? 1024 : 1000; + int exponent = 0; /* 0 = bad multiplier */ + int i; + switch( tail[0] ) + { + 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_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 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: Can't guess original name for '%s' -- using '%s'\n", + program_name, name, output_filename ); + } + + +static int open_instream( const char * const name, struct stat * const in_statsp, + const bool no_ofile ) + { + 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 && + ( S_ISBLK( mode ) || S_ISCHR( mode ) || + S_ISFIFO( mode ) || S_ISSOCK( mode ) ) ); + 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 ) ? + ",\n and '--stdout' was not specified" : "" ); + close( infd ); + infd = -1; + } + } + return infd; + } + + +static bool open_outstream( const bool force, const bool from_stdin ) + { + 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 = from_stdin ? all_rw : usr_rw; + int flags = O_APPEND | O_CREAT | O_RDWR | O_BINARY; + if( force ) flags |= O_TRUNC; else flags |= O_EXCL; + + outfd = open( output_filename, flags, outfd_mode ); + if( outfd >= 0 ) delete_output_on_interrupt = true; + else if( 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 && 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 ) + { + const mode_t mode = in_statsp->st_mode; + /* 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 ) + { 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_error( "Error closing output file", errno, false ); + 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 ); + } + + +int convert_retval( const int retval ) + { + switch( retval ) + { + case 0: return 0; + case LZIP_OOM_INBUF: + case LZIP_OOM_OUTBUF: + case LZIP_WRITE_ERROR: return 1; + case LZIP_HEADER1_EOF: + case LZIP_HEADER2_EOF: + case LZIP_BAD_MAGIC1: + case LZIP_BAD_MAGIC2: + case LZIP_BAD_VERSION: + case LZIP_BAD_DICT_SIZE: + case LZIP_BAD_DATA: + case LZIP_DATA_EOF: + case LZIP_BAD_CRC: return 2; + default: return 3; + } + } + + +static long fill( void * buf, unsigned long size ) + { + unsigned long sz = 0; + errno = 0; + while( sz < size ) + { + const int n = read( infd, (uint8_t *)buf + sz, min( 1UL << 20, size - sz ) ); + if( n > 0 ) sz += n; + else if( n == 0 ) break; /* EOF */ + else if( errno != EINTR ) break; + errno = 0; + } + return sz; + } + +long flush( void * buf, unsigned long size ) + { + unsigned long sz = ( outfd >= 0 ) ? 0 : size; + errno = 0; + while( sz < size ) + { + const int n = write( outfd, (uint8_t *)buf + sz, min( 1UL << 20, size - sz ) ); + if( n > 0 ) sz += n; + else if( n < 0 && errno != EINTR ) break; + errno = 0; + } + return sz; + } + +const char * global_name; +static void error(char *x) { show_file_error( global_name, x, 0 ); } + + +static int decompress( struct Pretty_print * const pp, const long cl_insize, + const long cl_outsize, const bool nofill, + const bool noflush, const bool testing ) + { + long in_len = cl_insize; + uint8_t * const inbuf = (in_len > 0) ? malloc( in_len ) : 0; + long out_size = cl_outsize; + uint8_t * const outbuf = (out_size > 0) ? malloc( out_size ) : 0; + long in_pos, out_pos; + int retval; + if( ( in_len > 0 && !inbuf ) || ( out_size > 0 && !outbuf ) ) + { show_error( "Not enough memory.", 0, false ); return 1; } + + if( inbuf ) + { + const long len = fill( inbuf, in_len ); + if( len < in_len ) + { if( errno ) { show_file_error( pp->name, "Read error", errno ); return 1; } + in_len = len; } + } + global_name = pp->name; + retval = convert_retval( __lunzip( inbuf, in_len, nofill ? 0 : fill, + noflush ? 0 : flush, outbuf, out_size, + &in_pos, &out_pos, error ) ); + if( retval ) return retval; + if( outbuf && noflush ) + { + const long len = flush( outbuf, out_pos ); + if( len < out_pos ) + { show_file_error( pp->name, "Write error", errno ); return 1; } + } + if( verbosity >= 1 ) Pp_show_msg( pp, 0 ); + if( verbosity >= 2 ) + { + if( out_pos <= 0 || in_pos <= 0 ) + fputs( "no data compressed. ", stderr ); + else + fprintf( stderr, "%6.3f:1, %5.2f%% ratio, %5.2f%% saved. ", + (double)out_pos / in_pos, + ( 100.0 * in_pos ) / out_pos, + 100.0 - ( ( 100.0 * in_pos ) / out_pos ) ); + if( verbosity >= 3 ) + fprintf( stderr, "decompressed %9lu, compressed %8lu. ", + out_pos, in_pos ); + } + if( verbosity >= 1 ) + fputs( testing ? "ok\n" : "done\n", stderr ); + return 0; + } + + +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 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 ) : "" ); + } + + +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[] ) + { + const char * default_output_filename = ""; + const char ** filenames = 0; + long cl_insize = 0; + long cl_outsize = 0; + int num_filenames = 0; + int argind = 0; + int failed_tests = 0; + int retval = 0; + int i; + bool filenames_given = false; + bool force = false; + bool in_place = false; + bool keep_input_files = false; + bool nofill = false; + bool noflush = false; + bool stdin_used = false; + bool testing = false; + bool to_stdout = false; + struct Pretty_print pp; + + enum { opt_insize = 256, opt_outsize, opt_nofill, opt_noflush }; + const struct ap_Option options[] = + { + { 'c', "stdout", ap_no }, + { 'd', "decompress", ap_no }, + { 'f', "force", ap_no }, + { 'h', "help", ap_no }, + { 'I', "in-place", ap_no }, + { 'k', "keep", ap_no }, + { 'n', "threads", ap_yes }, + { 'o', "output", ap_yes }, + { 'q', "quiet", ap_no }, + { 't', "test", ap_no }, + { 'v', "verbose", ap_no }, + { 'V', "version", ap_no }, + { opt_insize, "insize", ap_maybe }, + { opt_outsize, "outsize", ap_maybe }, + { opt_nofill, "nofill", ap_no }, + { opt_noflush, "noflush", ap_no }, + { 0 , 0, ap_no } }; + + struct Arg_parser parser; + invocation_name = argv[0]; + + if( !ap_init( &parser, argc, argv, options, 0 ) ) + { show_error( "Not enough memory.", 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 'I': in_place = true; break; + case 'k': keep_input_files = true; break; + case 'n': 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; + case opt_insize: + cl_insize = arg[0] ? getnum( arg, 1, LONG_MAX ) : 16384; break; + case opt_outsize: cl_outsize = arg[0] ? + getnum( arg, min_dictionary_size, LONG_MAX ) : max_dictionary_size; + break; + case opt_nofill: nofill = true; break; + case opt_noflush: noflush = true; break; + default : internal_error( "uncaught option." ); + } + } /* end process options */ + +#if defined(__MSVCRT__) || defined(__OS2__) + setmode( STDIN_FILENO, O_BINARY ); + setmode( STDOUT_FILENO, O_BINARY ); +#endif + + 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( testing ) + outfd = -1; + + if( !to_stdout && !testing && + ( 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 ) + { + const char * input_filename = ""; + int tmp; + struct stat in_stats; + const struct stat * in_statsp; + output_filename[0] = 0; + + if( !filenames[i][0] || strcmp( filenames[i], "-" ) == 0 ) + { + if( stdin_used ) continue; else stdin_used = true; + 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 ); + if( !open_outstream( force, true ) ) + { + if( retval < 1 ) retval = 1; + close( infd ); infd = -1; + continue; + } + } + } + } + else + { + input_filename = filenames[i]; + infd = open_instream( input_filename, &in_stats, to_stdout || testing ); + if( infd < 0 ) { if( retval < 1 ) retval = 1; continue; } + if( !testing ) + { + if( to_stdout ) outfd = STDOUT_FILENO; + else + { + set_d_outname( input_filename, extension_index( input_filename ) ); + if( !open_outstream( force, false ) ) + { + if( retval < 1 ) retval = 1; + close( infd ); infd = -1; + continue; + } + } + } + } + + Pp_set_name( &pp, input_filename ); + if( isatty( infd ) ) + { + show_file_error( pp.name, + "I won't read compressed data from a terminal.", 0 ); + if( retval < 1 ) retval = 1; + if( testing ) { close( infd ); infd = -1; continue; } + cleanup_and_fail( retval ); + } + + in_statsp = input_filename[0] ? &in_stats : 0; + if( in_place ) + tmp = decompress_in_place( infd, &pp, testing ); + else + tmp = decompress( &pp, cl_insize, cl_outsize, nofill, noflush, testing ); + if( tmp > retval ) retval = tmp; + if( tmp ) + { if( !testing ) cleanup_and_fail( retval ); + else ++failed_tests; } + + 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( "Error closing stdout", errno, false ); + if( retval < 1 ) 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; + } |