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Diffstat (limited to 'main.cc')
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1 files changed, 1126 insertions, 0 deletions
@@ -0,0 +1,1126 @@ +/* Lziprecover - Data recovery tool for the lzip format + Copyright (C) 2009-2024 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 command-line options, I/O errors, etc), 2 to + indicate a corrupt or invalid input file, 3 for an internal consistency + error (e.g., bug) which caused lziprecover to panic. +*/ + +#define _FILE_OFFSET_BITS 64 + +#include <algorithm> +#include <cctype> +#include <cerrno> +#include <climits> // SSIZE_MAX +#include <csignal> +#include <cstdio> +#include <cstdlib> +#include <cstring> +#include <new> +#include <string> +#include <vector> +#include <fcntl.h> +#include <stdint.h> // SIZE_MAX +#include <unistd.h> +#include <utime.h> +#include <sys/stat.h> +#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__ +#include <io.h> +#if defined __MSVCRT__ +#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 __DJGPP__ +#define S_ISSOCK(x) 0 +#define S_ISVTX 0 +#endif +#endif + +#include "arg_parser.h" +#include "lzip.h" +#include "decoder.h" + +#ifndef O_BINARY +#define O_BINARY 0 +#endif + +#if CHAR_BIT != 8 +#error "Environments where CHAR_BIT != 8 are not supported." +#endif + +#if ( defined SIZE_MAX && SIZE_MAX < ULONG_MAX ) || \ + ( defined SSIZE_MAX && SSIZE_MAX < LONG_MAX ) +#error "Environments where 'size_t' is narrower than 'long' are not supported." +#endif + +bool fits_in_size_t( const unsigned long long size ) // fits also in long + { return ( sizeof (long) <= sizeof (size_t) && size <= LONG_MAX ) || + ( sizeof (int) <= sizeof (size_t) && size <= INT_MAX ); } + +int verbosity = 0; + +const char * const program_name = "lziprecover"; +std::string output_filename; // global vars for output file +int outfd = -1; // see 'delete_output_on_interrupt' below + +namespace { + +const char * invocation_name = program_name; // default value + +const struct { const char * from; const char * to; } known_extensions[] = { + { ".lz", "" }, + { ".tlz", ".tar" }, + { 0, 0 } }; + +enum Mode { m_none, m_alone_to_lz, m_byte_repair, m_clear_marking, + m_debug_byte_repair, m_debug_decompress, m_debug_delay, + m_decompress, m_dump, m_list, m_md5sum, m_merge, m_nrep_stats, + m_range_dec, m_remove, m_reproduce, m_show_packets, m_split, + m_strip, m_test, m_unzcrash_bit, m_unzcrash_block }; + +/* Variable used in signal handler context. + It is not declared volatile because the handler never returns. */ +bool delete_output_on_interrupt = false; + + +void show_help() + { + std::printf( "Lziprecover is a data recovery tool and decompressor for files in the lzip\n" + "compressed data format (.lz). Lziprecover is able to repair slightly damaged\n" + "files (up to one single-byte error per member), produce a correct file by\n" + "merging the good parts of two or more damaged copies, reproduce a missing\n" + "(zeroed) sector using a reference file, extract data from damaged files,\n" + "decompress files, and test integrity of files.\n" + "\nWith the help of lziprecover, losing an entire archive just because of a\n" + "corrupt byte near the beginning is a thing of the past.\n" + "\nLziprecover can remove the damaged members from multimember files, for\n" + "example multimember tar.lz archives.\n" + "\nLziprecover provides random access to the data in multimember files; it only\n" + "decompresses the members containing the desired data.\n" + "\nLziprecover facilitates the management of metadata stored as trailing data\n" + "in lzip files.\n" + "\nLziprecover is not a replacement for regular backups, but a last line of\n" + "defense for the case where the backups are also damaged.\n" + "\nUsage: %s [options] [files]\n", invocation_name ); + std::printf( "\nOptions:\n" + " -h, --help display this help and exit\n" + " -V, --version output version information and exit\n" + " -a, --trailing-error exit with error status if trailing data\n" + " -A, --alone-to-lz convert lzma-alone files to lzip format\n" + " -c, --stdout write to standard output, keep input files\n" + " -d, --decompress decompress, test compressed file integrity\n" + " -D, --range-decompress=<n-m> decompress a range of bytes to stdout\n" + " -e, --reproduce try to reproduce a zeroed sector in file\n" + " --lzip-level=N|a|m[N] reproduce one level, all, or match length\n" + " --lzip-name=<name> name of lzip executable for --reproduce\n" + " --reference-file=<file> reference file for --reproduce\n" + " -f, --force overwrite existing output files\n" + " -i, --ignore-errors ignore some errors in -d, -D, -l, -t, --dump\n" + " -k, --keep keep (don't delete) input files\n" + " -l, --list print (un)compressed file sizes\n" + " -m, --merge repair errors in file using several copies\n" + " -o, --output=<file> place the output into <file>\n" + " -q, --quiet suppress all messages\n" + " -R, --byte-repair try to repair a corrupt byte in file\n" + " -s, --split split multimember file in single-member files\n" + " -t, --test test compressed file integrity\n" + " -v, --verbose be verbose (a 2nd -v gives more)\n" + " --dump=<list>:d:e:t dump members, damaged/empty, tdata to stdout\n" + " --remove=<list>:d:e:t remove members, tdata from files in place\n" + " --strip=<list>:d:e:t copy files to stdout stripping members given\n" + " --empty-error exit with error status if empty member in file\n" + " --marking-error exit with error status if 1st LZMA byte not 0\n" + " --loose-trailing allow trailing data seeming corrupt header\n" + " --clear-marking reset the first LZMA byte of each member\n" ); + if( verbosity >= 1 ) + { + std::printf( "\nDebug options for experts:\n" + " -E, --debug-reproduce=<range>[,ss] set range to 0 and try to reproduce file\n" + " -M, --md5sum print the MD5 digests of the input files\n" + " -S, --nrep-stats[=<val>] print stats of N-byte repeated sequences\n" + " -U, --unzcrash=1|B<size> test 1-bit or block errors in input file\n" + " -W, --debug-decompress=<pos>,<val> set pos to val and decompress to stdout\n" + " -X, --show-packets[=<pos>,<val>] show in stdout the decoded LZMA packets\n" + " -Y, --debug-delay=<range> find max error detection delay in <range>\n" + " -Z, --debug-byte-repair=<pos>,<val> test repair one-byte error at <pos>\n" ); + } + std::printf( "\nIf no file names are given, or if a file is '-', lziprecover 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" + "\nTo extract all the files from archive 'foo.tar.lz', use the commands\n" + "'tar -xf foo.tar.lz' or 'lziprecover -cd foo.tar.lz | tar -xf -'.\n" + "\nExit status: 0 for a normal exit, 1 for environmental problems\n" + "(file not found, invalid command-line options, I/O errors, etc), 2 to\n" + "indicate a corrupt or invalid input file, 3 for an internal consistency\n" + "error (e.g., bug) which caused lziprecover to panic.\n" + "\nReport bugs to lzip-bug@nongnu.org\n" + "Lziprecover home page: http://www.nongnu.org/lzip/lziprecover.html\n" ); + } + +} // end namespace + +void Pretty_print::operator()( const char * const msg, FILE * const f ) const + { + if( verbosity < 0 ) return; + if( first_post ) + { + first_post = false; + std::fputs( padded_name.c_str(), f ); + if( !msg ) std::fflush( f ); + } + if( msg ) std::fprintf( f, "%s\n", msg ); + } + + +const char * bad_version( const unsigned version ) + { + static char buf[80]; + snprintf( buf, sizeof buf, "Version %u member format not supported.", + version ); + return buf; + } + + +const char * format_ds( const unsigned dictionary_size ) + { + enum { bufsize = 16, factor = 1024, n = 3 }; + static char buf[bufsize]; + const char * const prefix[n] = { "Ki", "Mi", "Gi" }; + const char * p = ""; + const char * np = " "; + unsigned num = dictionary_size; + bool exact = ( num % factor == 0 ); + + for( int i = 0; i < n && ( num > 9999 || ( exact && num >= factor ) ); ++i ) + { num /= factor; if( num % factor != 0 ) exact = false; + p = prefix[i]; np = ""; } + snprintf( buf, bufsize, "%s%4u %sB", np, num, p ); + return buf; + } + + +void show_header( const unsigned dictionary_size ) + { + std::fprintf( stderr, "dict %s, ", format_ds( dictionary_size ) ); + } + + +#include "main_common.cc" + + +// Colon-separated list of "damaged", "empty", "tdata", [r][^]<list> (1 1,3-5) +void Member_list::parse_ml( const char * const arg, + const char * const option_name, + Cl_options & cl_opts ) + { + const char * p = arg; // points to current char + while( true ) + { + const char * tp = p; // points to terminator (':' or '\0') + while( *tp && *tp != ':' ) ++tp; + const unsigned len = tp - p; + if( std::islower( *(const unsigned char *)p ) ) + { + if( len <= 7 && std::strncmp( "damaged", p, len ) == 0 ) + { damaged = true; cl_opts.ignore_errors = true; goto next; } + if( len <= 5 && std::strncmp( "empty", p, len ) == 0 ) + { empty = true; cl_opts.ignore_empty = true; goto next; } + if( len <= 5 && std::strncmp( "tdata", p, len ) == 0 ) + { tdata = true; cl_opts.ignore_trailing = true; goto next; } + } + { + const bool reverse = ( *p == 'r' ); + if( reverse ) ++p; + if( *p == '^' ) { ++p; if( reverse ) rin = false; else in = false; } + std::vector< Block > * rvp = reverse ? &rrange_vector : &range_vector; + while( std::isdigit( *(const unsigned char *)p ) ) + { + const char * tail; + const long pos = getnum( p, option_name, 0, 1, LONG_MAX, &tail ) - 1; + if( rvp->size() && pos < rvp->back().end() ) break; + const long size = (*tail == '-') ? + getnum( tail + 1, option_name, 0, pos + 1, LONG_MAX, &tail ) - pos : 1; + rvp->push_back( Block( pos, size ) ); + if( tail == tp ) goto next; + if( *tail == ',' ) p = tail + 1; else break; + } + } + show_option_error( arg, "Invalid list of members in", option_name ); + std::exit( 1 ); +next: + if( *(p = tp) != 0 ) ++p; else return; + } + } + + +namespace { + +// Recognized formats: <digit> 'a' m[<match_length>] +int parse_lzip_level( const char * const arg, const char * const option_name ) + { + if( *arg == 'a' || std::isdigit( *(const unsigned char *)arg ) ) return *arg; + if( *arg != 'm' ) + { show_option_error( arg, "Invalid argument in", option_name ); + std::exit( 1 ); } + if( arg[1] == 0 ) return -1; + return -getnum( arg + 1, option_name, 0, min_match_len_limit, max_match_len ); + } + + +/* Recognized format: <range>[,<sector_size>] + range formats: <begin> <begin>-<end> <begin>,<size> ,<size> + Return a pointer to the byte following the bytes parsed. +*/ +const char * parse_range( const char * const arg, const char * const pn, + Block & range, int * const sector_sizep = 0 ) + { + const char * tail = arg; + long long value = + ( arg[0] == ',' ) ? 0 : getnum( arg, pn, 0, 0, INT64_MAX - 1, &tail ); + if( tail[0] == 0 || tail[0] == ',' || tail[0] == '-' || tail[0] == ':' ) + { + range.pos( value ); + if( tail[0] == 0 || tail[0] == ':' ) + { range.size( INT64_MAX - value ); return tail; } + const bool is_size = ( tail[0] == ',' ); + if( sector_sizep && tail[1] == ',' ) { value = INT64_MAX - value; ++tail; } + else value = getnum( tail + 1, pn, 0, 1, INT64_MAX, &tail ); // size + if( !is_size && value <= range.pos() ) + { show_option_error( arg, "Begin must be < end in", pn ); std::exit( 1 ); } + if( !is_size ) value -= range.pos(); // size = end - pos + if( INT64_MAX - value >= range.pos() ) + { + range.size( value ); + if( sector_sizep && tail[0] == ',' ) + *sector_sizep = getnum( tail + 1, pn, 0, 8, INT_MAX, &tail ); + return tail; + } + } + show_option_error( arg, "Invalid decompression range in", pn ); + std::exit( 1 ); + } + + +void one_file( const int files ) + { + if( files != 1 ) + { + show_error( "You must specify exactly 1 file.", 0, true ); + std::exit( 1 ); + } + } + +void at_least_one_file( const int files ) + { + if( files < 1 ) + { + show_error( "You must specify at least 1 file.", 0, true ); + std::exit( 1 ); + } + } + + +void set_mode( Mode & program_mode, const Mode new_mode ) + { + if( program_mode != m_none && program_mode != new_mode ) + { + show_error( "Only one operation can be specified.", 0, true ); + std::exit( 1 ); + } + program_mode = new_mode; + } + + +void parse_u( const char * const arg, const char * const option_name, + Mode & program_mode, int & sector_size ) + { + if( arg[0] == '1' ) set_mode( program_mode, m_unzcrash_bit ); + else if( arg[0] == 'B' ) + { set_mode( program_mode, m_unzcrash_block ); + sector_size = getnum( arg + 1, option_name, 0, 1, INT_MAX ); } + else + { show_option_error( arg, "Invalid argument in", option_name ); + std::exit( 1 ); } + } + + +int extension_index( const std::string & name ) + { + for( int eindex = 0; known_extensions[eindex].from; ++eindex ) + { + const std::string ext( known_extensions[eindex].from ); + if( name.size() > ext.size() && + name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 ) + return eindex; + } + return -1; + } + + +void set_a_outname( const std::string & name ) + { + output_filename = name; + if( name.size() > 5 && name.compare( name.size() - 5, 5, ".lzma" ) == 0 ) + output_filename.erase( name.size() - 2 ); + else if( name.size() > 4 && name.compare( name.size() - 4, 4, ".tlz" ) == 0 ) + output_filename.insert( name.size() - 2, "ar." ); + else if( name.size() <= 3 || name.compare( name.size() - 3, 3, ".lz" ) != 0 ) + output_filename += known_extensions[0].from; + } + + +void set_d_outname( const std::string & name, const int eindex ) + { + if( eindex >= 0 ) + { + const std::string from( known_extensions[eindex].from ); + if( name.size() > from.size() ) + { + output_filename.assign( name, 0, name.size() - from.size() ); + output_filename += known_extensions[eindex].to; + return; + } + } + output_filename = name; output_filename += ".out"; + if( verbosity >= 1 ) + std::fprintf( stderr, "%s: %s: Can't guess original name -- using '%s'\n", + program_name, name.c_str(), output_filename.c_str() ); + } + +} // end namespace + +int open_instream( const char * const name, struct stat * const in_statsp, + const bool one_to_one, const bool reg_only ) + { + 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 && !reg_only && + ( S_ISBLK( mode ) || S_ISCHR( mode ) || + S_ISFIFO( mode ) || S_ISSOCK( mode ) ) ); + if( i != 0 || ( !S_ISREG( mode ) && ( !can_read || one_to_one ) ) ) + { + if( verbosity >= 0 ) + std::fprintf( stderr, "%s: %s: Input file is not a regular file%s.\n", + program_name, name, ( can_read && one_to_one ) ? + ",\n and neither '-c' nor '-o' were specified" : "" ); + close( infd ); + infd = -1; + } + } + return infd; + } + + +int open_truncable_stream( const char * const name, + struct stat * const in_statsp ) + { + int fd = open( name, O_RDWR | O_BINARY ); + if( fd < 0 ) + show_file_error( name, "Can't open input file", errno ); + else + { + const int i = fstat( fd, in_statsp ); + const mode_t mode = in_statsp->st_mode; + if( i != 0 || !S_ISREG( mode ) ) + { show_file_error( name, "Not a regular file." ); close( fd ); fd = -1; } + } + return fd; + } + +namespace { + +bool make_dirs( const std::string & name ) + { + int i = name.size(); + while( i > 0 && name[i-1] != '/' ) --i; // remove last component + while( i > 0 && name[i-1] == '/' ) --i; // remove slash(es) + const int dirsize = i; // size of dirname without trailing slash(es) + + for( i = 0; i < dirsize; ) // if dirsize == 0, dirname is '/' or empty + { + while( i < dirsize && name[i] == '/' ) ++i; + const int first = i; + while( i < dirsize && name[i] != '/' ) ++i; + if( first < i ) + { + const std::string partial( name, 0, i ); + const mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; + struct stat st; + if( stat( partial.c_str(), &st ) == 0 ) + { if( !S_ISDIR( st.st_mode ) ) { errno = ENOTDIR; return false; } } + else if( mkdir( partial.c_str(), mode ) != 0 && errno != EEXIST ) + return false; // if EEXIST, another process created the dir + } + } + return true; + } + +const char * const force_msg = + "Output file already exists. Use '--force' to overwrite it."; + +} // end namespace + +bool open_outstream( const bool force, const bool protect, + const bool rw, const bool skipping, const bool to_file ) + { + 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 = protect ? usr_rw : all_rw; + int flags = O_CREAT | ( rw ? O_RDWR : O_WRONLY ) | O_BINARY; + if( force ) flags |= O_TRUNC; else flags |= O_EXCL; + + outfd = -1; + if( output_filename.size() && + output_filename[output_filename.size()-1] == '/' ) errno = EISDIR; + else { + if( ( !protect || to_file ) && !make_dirs( output_filename ) ) + { show_file_error( output_filename.c_str(), + "Error creating intermediate directory", errno ); return false; } + outfd = open( output_filename.c_str(), flags, outfd_mode ); + if( outfd >= 0 ) { delete_output_on_interrupt = true; return true; } + if( errno == EEXIST ) + { show_file_error( output_filename.c_str(), skipping ? + "Output file already exists, skipping." : force_msg ); return false; } + } + show_file_error( output_filename.c_str(), "Can't create output file", errno ); + return false; + } + + +bool output_file_exists() + { + struct stat st; + if( stat( output_filename.c_str(), &st ) == 0 ) + { show_file_error( output_filename.c_str(), force_msg ); return true; } + return false; + } + + +void set_signals( void (*action)(int) ) + { + std::signal( SIGHUP, action ); + std::signal( SIGINT, action ); + std::signal( SIGTERM, action ); + } + + +void cleanup_and_fail( const int retval ) + { + set_signals( SIG_IGN ); // ignore signals + if( delete_output_on_interrupt ) + { + delete_output_on_interrupt = false; + show_file_error( output_filename.c_str(), + "Deleting output file, if it exists." ); + if( outfd >= 0 ) { close( outfd ); outfd = -1; } + if( std::remove( output_filename.c_str() ) != 0 && errno != ENOENT ) + show_error( "warning: deletion of output file failed", errno ); + } + std::exit( retval ); + } + + +bool check_tty_out() + { + if( isatty( outfd ) ) + { show_file_error( output_filename.size() ? + output_filename.c_str() : "(stdout)", + "I won't write compressed data to a terminal." ); + return false; } + return true; + } + +namespace { + +extern "C" void signal_handler( int ) + { + show_error( "Control-C or similar caught, quitting." ); + cleanup_and_fail( 1 ); + } + + +bool check_tty_in( const char * const input_filename, const int infd, + const Mode program_mode, int & retval ) + { + if( isatty( infd ) ) // all modes read compressed data + { show_file_error( input_filename, + "I won't read compressed data from a terminal." ); + close( infd ); set_retval( retval, 2 ); + if( program_mode != m_test ) cleanup_and_fail( retval ); + return false; } + return true; + } + +bool check_tty_out( const Mode program_mode ) + { return program_mode != m_alone_to_lz || ::check_tty_out(); } + + +// Set permissions, owner, and times. +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 in many cases returns 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_file_error( output_filename.c_str(), "Error closing output file", + errno ); 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.c_str(), &t ) != 0 ) warning = true; + } + if( warning && verbosity >= 1 ) + show_file_error( output_filename.c_str(), + "warning: can't change output file attributes", errno ); + } + + +unsigned char xdigit( const unsigned value ) // hex digit for 'value' + { + if( value <= 9 ) return '0' + value; + if( value <= 15 ) return 'A' + value - 10; + return 0; + } + + +bool show_trailing_data( const uint8_t * const data, const int size, + const Pretty_print & pp, const bool all, + const int ignore_trailing ) // -1 = show + { + if( verbosity >= 4 || ignore_trailing <= 0 ) + { + std::string msg; + if( !all ) msg = "first bytes of "; + msg += "trailing data = "; + for( int i = 0; i < size; ++i ) + { + msg += xdigit( data[i] >> 4 ); + msg += xdigit( data[i] & 0x0F ); + msg += ' '; + } + msg += '\''; + for( int i = 0; i < size; ++i ) + { if( std::isprint( data[i] ) ) msg += data[i]; else msg += '.'; } + msg += '\''; + pp( msg.c_str() ); + if( ignore_trailing == 0 ) show_file_error( pp.name(), trailing_msg ); + } + return ignore_trailing > 0; + } + + +int decompress( const unsigned long long cfile_size, const int infd, + const Cl_options & cl_opts, const Pretty_print & pp, + const bool testing ) + { + unsigned long long partial_file_pos = 0; + Range_decoder rdec( infd ); + int retval = 0; + + for( bool first_member = true; ; first_member = false ) + { + Lzip_header header; + rdec.reset_member_position(); + const int size = rdec.read_header_carefully( header, cl_opts.ignore_errors ); + if( rdec.finished() || // End Of File + ( size < header.size && !rdec.find_header( header ) ) ) + { + if( first_member ) + { show_file_error( pp.name(), "File ends unexpectedly at member header." ); + retval = 2; } + else if( header.check_prefix( size ) ) + { pp( "Truncated header in multimember file." ); + show_trailing_data( header.data, size, pp, true, -1 ); retval = 2; } + else if( size > 0 && !show_trailing_data( header.data, size, pp, true, + cl_opts.ignore_trailing ) ) retval = 2; + break; + } + if( !header.check_magic() ) + { + if( first_member ) + { show_file_error( pp.name(), bad_magic_msg ); retval = 2; } + else if( !cl_opts.loose_trailing && header.check_corrupt() ) + { pp( corrupt_mm_msg ); + show_trailing_data( header.data, size, pp, false, -1 ); retval = 2; } + else if( !show_trailing_data( header.data, size, pp, false, + cl_opts.ignore_trailing ) ) retval = 2; + if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break; + } + if( !header.check_version() ) + { pp( bad_version( header.version() ) ); retval = 2; + if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break; } + const unsigned dictionary_size = header.dictionary_size(); + if( !isvalid_ds( dictionary_size ) ) + { pp( bad_dict_msg ); retval = 2; + if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break; } + + if( verbosity >= 2 || ( verbosity == 1 && first_member ) ) pp(); + + LZ_decoder decoder( rdec, dictionary_size, outfd ); + show_dprogress( cfile_size, partial_file_pos, &rdec, &pp ); // init + const int result = decoder.decode_member( cl_opts, pp ); + partial_file_pos += rdec.member_position(); + if( result != 0 ) + { + retval = 2; + if( verbosity >= 0 && result <= 2 ) + { + pp(); + std::fprintf( stderr, "%s at pos %llu\n", ( result == 2 ) ? + "File ends unexpectedly" : "Decoder error", + partial_file_pos ); + } + else if( result == 5 ) { pp( empty_msg ); break; } + else if( result == 6 ) { pp( marking_msg ); break; } + if( cl_opts.ignore_errors ) { pp.reset(); continue; } else break; + } + if( verbosity >= 2 ) + { std::fputs( testing ? "ok\n" : "done\n", stderr ); pp.reset(); } + } + if( verbosity == 1 && retval == 0 ) + std::fputs( testing ? "ok\n" : "done\n", stderr ); + if( retval == 2 && cl_opts.ignore_errors ) retval = 0; + return retval; + } + +} // end namespace + +void set_signal_handler() { set_signals( signal_handler ); } + +bool close_outstream( const struct stat * const in_statsp ) + { + if( delete_output_on_interrupt ) close_and_set_permissions( in_statsp ); + if( outfd >= 0 && close( outfd ) != 0 ) + { show_error( "Error closing stdout", errno ); return false; } + outfd = -1; + return true; + } + + +std::string insert_fixed( std::string name ) + { + if( name.size() > 7 && name.compare( name.size() - 7, 7, ".tar.lz" ) == 0 ) + name.insert( name.size() - 7, "_fixed" ); + else if( name.size() > 3 && name.compare( name.size() - 3, 3, ".lz" ) == 0 ) + name.insert( name.size() - 3, "_fixed" ); + else if( name.size() > 4 && name.compare( name.size() - 4, 4, ".tlz" ) == 0 ) + name.insert( name.size() - 4, "_fixed" ); + else name += "_fixed.lz"; + return name; + } + + +void show_2file_error( const char * const msg1, const char * const name1, + const char * const name2, const char * const msg2 ) + { + if( verbosity >= 0 ) + std::fprintf( stderr, "%s: %s '%s' and '%s' %s\n", + program_name, msg1, name1, name2, msg2 ); + } + + +void show_dprogress( const unsigned long long cfile_size, + const unsigned long long partial_size, + const Range_decoder * const d, + const Pretty_print * const p ) + { + static unsigned long long csize = 0; // file_size / 100 + static unsigned long long psize = 0; + static const Range_decoder * rdec = 0; + static const Pretty_print * pp = 0; + static int counter = 0; + static bool enabled = true; + + if( !enabled ) return; + if( p ) // initialize static vars + { + if( verbosity < 2 || !isatty( STDERR_FILENO ) ) { enabled = false; return; } + csize = cfile_size; psize = partial_size; rdec = d; pp = p; counter = 0; + } + if( rdec && pp && --counter <= 0 ) + { + const unsigned long long pos = psize + rdec->member_position(); + counter = 7; // update display every 114688 bytes + if( csize > 0 ) + std::fprintf( stderr, "%4llu%% %.1f MB\r", pos / csize, pos / 1000000.0 ); + else + std::fprintf( stderr, " %.1f MB\r", pos / 1000000.0 ); + pp->reset(); (*pp)(); // restore cursor position + } + } + + +int main( const int argc, const char * const argv[] ) + { + Block range( 0, 0 ); + int sector_size = INT_MAX; // default larger than practical range + Bad_byte bad_byte; + Member_list member_list; + std::string default_output_filename; + const char * lzip_name = "lzip"; // default is lzip + const char * reference_filename = 0; + Mode program_mode = m_none; + int lzip_level = 0; // 0 = test all levels and match lengths + // '0'..'9' = level, 'a' = all levels + // -5..-273 = match length, -1 = all lengths + int repeated_byte = -1; // 0 to 255, or -1 for all values + Cl_options cl_opts; // command-line options + bool force = false; + bool keep_input_files = false; + bool to_stdout = false; + if( argc > 0 ) invocation_name = argv[0]; + + enum { opt_cm = 256, opt_du, opt_eer, opt_lt, opt_lzl, opt_lzn, opt_mer, + opt_ref, opt_rem, opt_st }; + const Arg_parser::Option options[] = + { + { 'a', "trailing-error", Arg_parser::no }, + { 'A', "alone-to-lz", Arg_parser::no }, + { 'c', "stdout", Arg_parser::no }, + { 'd', "decompress", Arg_parser::no }, + { 'D', "range-decompress", Arg_parser::yes }, + { 'e', "reproduce", Arg_parser::no }, + { 'E', "debug-reproduce", Arg_parser::yes }, + { 'f', "force", Arg_parser::no }, + { 'h', "help", Arg_parser::no }, + { 'i', "ignore-errors", Arg_parser::no }, + { 'k', "keep", Arg_parser::no }, + { 'l', "list", Arg_parser::no }, + { 'm', "merge", Arg_parser::no }, + { 'M', "md5sum", Arg_parser::no }, + { 'n', "threads", Arg_parser::yes }, + { 'o', "output", Arg_parser::yes }, + { 'q', "quiet", Arg_parser::no }, + { 'R', "byte-repair", Arg_parser::no }, + { 'R', "repair", Arg_parser::no }, + { 's', "split", Arg_parser::no }, + { 'S', "nrep-stats", Arg_parser::maybe }, + { 't', "test", Arg_parser::no }, + { 'U', "unzcrash", Arg_parser::yes }, + { 'v', "verbose", Arg_parser::no }, + { 'V', "version", Arg_parser::no }, + { 'W', "debug-decompress", Arg_parser::yes }, + { 'X', "show-packets", Arg_parser::maybe }, + { 'Y', "debug-delay", Arg_parser::yes }, + { 'Z', "debug-byte-repair", Arg_parser::yes }, + { opt_cm, "clear-marking", Arg_parser::no }, + { opt_du, "dump", Arg_parser::yes }, + { opt_eer, "empty-error", Arg_parser::no }, + { opt_lt, "loose-trailing", Arg_parser::no }, + { opt_lzl, "lzip-level", Arg_parser::yes }, + { opt_lzn, "lzip-name", Arg_parser::yes }, + { opt_mer, "marking-error", Arg_parser::no }, + { opt_ref, "reference-file", Arg_parser::yes }, + { opt_rem, "remove", Arg_parser::yes }, + { opt_st, "strip", Arg_parser::yes }, + { 0, 0, Arg_parser::no } }; + + const 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 * const pn = parser.parsed_name( argind ).c_str(); + const std::string & sarg = parser.argument( argind ); + const char * const arg = sarg.c_str(); + switch( code ) + { + case 'a': cl_opts.ignore_trailing = false; break; + case 'A': set_mode( program_mode, m_alone_to_lz ); break; + case 'c': to_stdout = true; break; + case 'd': set_mode( program_mode, m_decompress ); break; + case 'D': set_mode( program_mode, m_range_dec ); + parse_range( arg, pn, range ); break; + case 'e': set_mode( program_mode, m_reproduce ); break; + case 'E': set_mode( program_mode, m_reproduce ); + parse_range( arg, pn, range, §or_size ); break; + case 'f': force = true; break; + case 'h': show_help(); return 0; + case 'i': cl_opts.ignore_errors = true; break; + case 'k': keep_input_files = true; break; + case 'l': set_mode( program_mode, m_list ); break; + case 'm': set_mode( program_mode, m_merge ); break; + case 'M': set_mode( program_mode, m_md5sum ); break; + case 'n': break; + case 'o': if( sarg == "-" ) to_stdout = true; + else { default_output_filename = sarg; } break; + case 'q': verbosity = -1; break; + case 'R': set_mode( program_mode, m_byte_repair ); break; + case 's': set_mode( program_mode, m_split ); break; + case 'S': if( arg[0] ) repeated_byte = getnum( arg, pn, 0, 0, 255 ); + set_mode( program_mode, m_nrep_stats ); break; + case 't': set_mode( program_mode, m_test ); break; + case 'U': parse_u( arg, pn, program_mode, sector_size ); break; + case 'v': if( verbosity < 4 ) ++verbosity; break; + case 'V': show_version(); return 0; + case 'W': set_mode( program_mode, m_debug_decompress ); + bad_byte.parse_bb( arg, pn ); break; + case 'X': set_mode( program_mode, m_show_packets ); + if( arg[0] ) { bad_byte.parse_bb( arg, pn ); } break; + case 'Y': set_mode( program_mode, m_debug_delay ); + parse_range( arg, pn, range ); break; + case 'Z': set_mode( program_mode, m_debug_byte_repair ); + bad_byte.parse_bb( arg, pn ); break; + case opt_cm: set_mode( program_mode, m_clear_marking ); + cl_opts.ignore_marking = true; break; + case opt_du: set_mode( program_mode, m_dump ); + member_list.parse_ml( arg, pn, cl_opts ); break; + case opt_eer: cl_opts.ignore_empty = false; break; + case opt_lt: cl_opts.loose_trailing = true; break; + case opt_lzl: lzip_level = parse_lzip_level( arg, pn ); break; + case opt_lzn: lzip_name = arg; break; + case opt_mer: cl_opts.ignore_marking = false; break; + case opt_ref: reference_filename = arg; break; + case opt_rem: set_mode( program_mode, m_remove ); + member_list.parse_ml( arg, pn, cl_opts ); break; + case opt_st: set_mode( program_mode, m_strip ); + member_list.parse_ml( arg, pn, cl_opts ); break; + default: internal_error( "uncaught option." ); + } + } // end process options + +#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__ + setmode( STDIN_FILENO, O_BINARY ); + setmode( STDOUT_FILENO, O_BINARY ); +#endif + + if( program_mode == m_none ) + { + show_error( "You must specify the operation to be performed.", 0, true ); + return 1; + } + + std::vector< std::string > filenames; + bool filenames_given = false; + for( ; argind < parser.arguments(); ++argind ) + { + filenames.push_back( parser.argument( argind ) ); + if( filenames.back() != "-" ) filenames_given = true; + } + + const char terminator = isatty( STDOUT_FILENO ) ? '\r' : '\n'; + try { + switch( program_mode ) + { + case m_none: internal_error( "invalid operation." ); break; + case m_alone_to_lz: break; + case m_byte_repair: + one_file( filenames.size() ); + return byte_repair( filenames[0], default_output_filename, cl_opts, + terminator, force ); + case m_clear_marking: + at_least_one_file( filenames.size() ); + return clear_marking( filenames, cl_opts ); + case m_debug_byte_repair: + one_file( filenames.size() ); + return debug_byte_repair( filenames[0].c_str(), cl_opts, bad_byte, terminator ); + case m_debug_decompress: + one_file( filenames.size() ); + return debug_decompress( filenames[0].c_str(), cl_opts, bad_byte, false ); + case m_debug_delay: + one_file( filenames.size() ); + return debug_delay( filenames[0].c_str(), cl_opts, range, terminator ); + case m_decompress: break; + case m_dump: + case m_strip: + at_least_one_file( filenames.size() ); + return dump_members( filenames, default_output_filename, cl_opts, + member_list, force, program_mode == m_strip, to_stdout ); + case m_list: break; + case m_md5sum: break; + case m_merge: + if( filenames.size() < 2 ) + { show_error( "You must specify at least 2 files.", 0, true ); return 1; } + return merge_files( filenames, default_output_filename, cl_opts, + terminator, force ); + case m_nrep_stats: + return print_nrep_stats( filenames, cl_opts, repeated_byte ); + case m_range_dec: + one_file( filenames.size() ); + return range_decompress( filenames[0], default_output_filename, + cl_opts, range, force, to_stdout ); + case m_remove: + at_least_one_file( filenames.size() ); + return remove_members( filenames, cl_opts, member_list ); + case m_reproduce: + one_file( filenames.size() ); + if( !reference_filename || !reference_filename[0] ) + { show_error( "You must specify a reference file.", 0, true ); return 1; } + if( range.size() > 0 ) + return debug_reproduce_file( filenames[0].c_str(), lzip_name, + reference_filename, cl_opts, range, sector_size, lzip_level ); + else + return reproduce_file( filenames[0], default_output_filename, lzip_name, + reference_filename, cl_opts, lzip_level, terminator, force ); + case m_show_packets: + one_file( filenames.size() ); + return debug_decompress( filenames[0].c_str(), cl_opts, bad_byte, true ); + case m_split: + one_file( filenames.size() ); + return split_file( filenames[0], default_output_filename, cl_opts, force ); + case m_test: break; + case m_unzcrash_bit: + one_file( filenames.size() ); + return lunzcrash_bit( filenames[0].c_str(), cl_opts ); + case m_unzcrash_block: + one_file( filenames.size() ); + return lunzcrash_block( filenames[0].c_str(), cl_opts, sector_size ); + } + } + catch( std::bad_alloc & ) { show_error( mem_msg ); cleanup_and_fail( 1 ); } + catch( Error & e ) { show_error( e.msg, errno ); cleanup_and_fail( 1 ); } + + if( filenames.empty() ) filenames.push_back("-"); + + if( program_mode == m_list ) return list_files( filenames, cl_opts ); + if( program_mode == m_md5sum ) return md5sum_files( filenames ); + + if( program_mode != m_alone_to_lz && program_mode != m_decompress && + program_mode != m_test ) + internal_error( "invalid decompressor operation." ); + + if( program_mode == m_test ) to_stdout = false; // apply overrides + if( program_mode == m_test || to_stdout ) default_output_filename.clear(); + + if( to_stdout && program_mode != m_test ) // check tty only once + { outfd = STDOUT_FILENO; if( !check_tty_out( program_mode ) ) return 1; } + else outfd = -1; + + const bool to_file = !to_stdout && program_mode != m_test && + default_output_filename.size(); + if( !to_stdout && program_mode != m_test && ( filenames_given || to_file ) ) + set_signals( signal_handler ); + + Pretty_print pp( filenames ); + + int failed_tests = 0; + int retval = 0; + const bool one_to_one = !to_stdout && program_mode != m_test && !to_file; + bool stdin_used = false; + struct stat in_stats; + for( unsigned i = 0; i < filenames.size(); ++i ) + { + std::string input_filename; + int infd; + + pp.set_name( filenames[i] ); + if( filenames[i] == "-" ) + { + if( stdin_used ) continue; else stdin_used = true; + infd = STDIN_FILENO; + if( !check_tty_in( pp.name(), infd, program_mode, retval ) ) continue; + if( one_to_one ) { outfd = STDOUT_FILENO; output_filename.clear(); } + } + else + { + input_filename = filenames[i]; + infd = open_instream( input_filename.c_str(), &in_stats, one_to_one ); + if( infd < 0 ) { set_retval( retval, 1 ); continue; } + if( !check_tty_in( pp.name(), infd, program_mode, retval ) ) continue; + if( one_to_one ) // open outfd after checking infd + { + if( program_mode == m_alone_to_lz ) set_a_outname( input_filename ); + else set_d_outname( input_filename, extension_index( input_filename ) ); + if( !open_outstream( force, true ) ) + { close( infd ); set_retval( retval, 1 ); continue; } + } + } + + if( one_to_one && !check_tty_out( program_mode ) ) + { set_retval( retval, 1 ); return retval; } // don't delete a tty + + if( to_file && outfd < 0 ) // open outfd after checking infd + { + output_filename = default_output_filename; + if( !open_outstream( force, false ) || !check_tty_out( program_mode ) ) + return 1; // check tty only once and don't try to delete a tty + } + + const struct stat * const in_statsp = + ( input_filename.size() && one_to_one ) ? &in_stats : 0; + const unsigned long long cfile_size = + ( input_filename.size() && S_ISREG( in_stats.st_mode ) ) ? + ( in_stats.st_size + 99 ) / 100 : 0; + int tmp; + try { + if( program_mode == m_alone_to_lz ) + tmp = alone_to_lz( infd, pp ); + else + tmp = decompress( cfile_size, infd, cl_opts, pp, program_mode == m_test ); + } + catch( std::bad_alloc & ) { pp( mem_msg ); tmp = 1; } + catch( Error & e ) { pp(); show_error( e.msg, errno ); tmp = 1; } + if( close( infd ) != 0 ) + { show_file_error( pp.name(), "Error closing input file", errno ); + set_retval( tmp, 1 ); } + set_retval( retval, tmp ); + if( tmp ) + { if( program_mode != m_test ) cleanup_and_fail( retval ); + else ++failed_tests; } + + if( delete_output_on_interrupt && one_to_one ) + close_and_set_permissions( in_statsp ); + if( input_filename.size() && !keep_input_files && one_to_one && + ( program_mode != m_decompress || !cl_opts.ignore_errors ) ) + std::remove( input_filename.c_str() ); + } + if( delete_output_on_interrupt ) // -o + close_and_set_permissions( ( retval == 0 && !stdin_used && + filenames_given && filenames.size() == 1 ) ? &in_stats : 0 ); + else if( outfd >= 0 && close( outfd ) != 0 ) // -c + { + show_error( "Error closing stdout", errno ); + set_retval( retval, 1 ); + } + if( failed_tests > 0 && verbosity >= 1 && filenames.size() > 1 ) + std::fprintf( stderr, "%s: warning: %d %s failed the test.\n", + program_name, failed_tests, + ( failed_tests == 1 ) ? "file" : "files" ); + return retval; + } |