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Diffstat (limited to 'lzip.h')
| -rw-r--r-- | lzip.h | 340 |
1 files changed, 340 insertions, 0 deletions
@@ -0,0 +1,340 @@ +/* Plzip - Massively parallel implementation of lzip + 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/>. +*/ + +#include <pthread.h> + +enum { + min_dictionary_bits = 12, + min_dictionary_size = 1 << min_dictionary_bits, // >= modeled_distances + max_dictionary_bits = 29, + max_dictionary_size = 1 << max_dictionary_bits, + min_member_size = 36 }; + + +// defined in main.cc +extern int verbosity; + +class Pretty_print // requires global var 'int verbosity' + { + std::string name_; + std::string padded_name; + const char * const stdin_name; + unsigned longest_name; + mutable bool first_post; + +public: + Pretty_print( const std::vector< std::string > & filenames ) + : stdin_name( "(stdin)" ), longest_name( 0 ), first_post( false ) + { + if( verbosity <= 0 ) return; + const unsigned stdin_name_len = std::strlen( stdin_name ); + for( unsigned i = 0; i < filenames.size(); ++i ) + { + const std::string & s = filenames[i]; + const unsigned len = ( s == "-" ) ? stdin_name_len : s.size(); + if( longest_name < len ) longest_name = len; + } + if( longest_name == 0 ) longest_name = stdin_name_len; + } + + void set_name( const std::string & filename ) + { + if( filename.size() && filename != "-" ) name_ = filename; + else name_ = stdin_name; + padded_name = " "; padded_name += name_; padded_name += ": "; + if( longest_name > name_.size() ) + padded_name.append( longest_name - name_.size(), ' ' ); + first_post = true; + } + + void reset() const { if( name_.size() ) first_post = true; } + const char * name() const { return name_.c_str(); } + void operator()( const char * const msg = 0 ) const; + }; + + +inline bool isvalid_ds( const unsigned dictionary_size ) + { return dictionary_size >= min_dictionary_size && + dictionary_size <= max_dictionary_size; } + + +inline int real_bits( unsigned value ) + { + int bits = 0; + while( value > 0 ) { value >>= 1; ++bits; } + return bits; + } + + +const uint8_t lzip_magic[4] = { 0x4C, 0x5A, 0x49, 0x50 }; // "LZIP" + +struct Lzip_header + { + enum { size = 6 }; + uint8_t data[size]; // 0-3 magic bytes + // 4 version + // 5 coded dictionary size + + void set_magic() { std::memcpy( data, lzip_magic, 4 ); data[4] = 1; } + bool check_magic() const { return std::memcmp( data, lzip_magic, 4 ) == 0; } + + bool check_prefix( const int sz ) const // detect (truncated) header + { + for( int i = 0; i < sz && i < 4; ++i ) + if( data[i] != lzip_magic[i] ) return false; + return sz > 0; + } + + bool check_corrupt() const // detect corrupt header + { + int matches = 0; + for( int i = 0; i < 4; ++i ) + if( data[i] == lzip_magic[i] ) ++matches; + return matches > 1 && matches < 4; + } + + uint8_t version() const { return data[4]; } + bool check_version() const { return data[4] == 1; } + + unsigned dictionary_size() const + { + unsigned sz = 1 << ( data[5] & 0x1F ); + if( sz > min_dictionary_size ) + sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 ); + return sz; + } + + bool dictionary_size( const unsigned sz ) + { + if( !isvalid_ds( sz ) ) return false; + data[5] = real_bits( sz - 1 ); + if( sz > min_dictionary_size ) + { + const unsigned base_size = 1 << data[5]; + const unsigned fraction = base_size / 16; + for( unsigned i = 7; i >= 1; --i ) + if( base_size - ( i * fraction ) >= sz ) + { data[5] |= i << 5; break; } + } + return true; + } + + bool check() const + { return check_magic() && check_version() && + isvalid_ds( dictionary_size() ); } + }; + + +struct Lzip_trailer + { + enum { size = 20 }; + uint8_t data[size]; // 0-3 CRC32 of the uncompressed data + // 4-11 size of the uncompressed data + // 12-19 member size including header and trailer + + unsigned data_crc() const + { + unsigned tmp = 0; + for( int i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; } + return tmp; + } + + void data_crc( unsigned crc ) + { for( int i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; } } + + unsigned long long data_size() const + { + unsigned long long tmp = 0; + for( int i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; } + return tmp; + } + + void data_size( unsigned long long sz ) + { for( int i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } + + unsigned long long member_size() const + { + unsigned long long tmp = 0; + for( int i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; } + return tmp; + } + + void member_size( unsigned long long sz ) + { for( int i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } + + bool check_consistency() const // check internal consistency + { + const unsigned crc = data_crc(); + const unsigned long long dsize = data_size(); + if( ( crc == 0 ) != ( dsize == 0 ) ) return false; + const unsigned long long msize = member_size(); + if( msize < min_member_size ) return false; + const unsigned long long mlimit = ( 9 * dsize + 7 ) / 8 + min_member_size; + if( mlimit > dsize && msize > mlimit ) return false; + const unsigned long long dlimit = 7090 * ( msize - 26 ) - 1; + if( dlimit > msize && dsize > dlimit ) return false; + return true; + } + }; + + +struct Cl_options // command-line options + { + bool ignore_trailing; + bool loose_trailing; + + Cl_options() : ignore_trailing( true ), loose_trailing( false ) {} + }; + + +inline void set_retval( int & retval, const int new_val ) + { if( retval < new_val ) retval = new_val; } + +const char * const bad_magic_msg = "Bad magic number (file not in lzip format)."; +const char * const bad_dict_msg = "Invalid dictionary size in member header."; +const char * const corrupt_mm_msg = "Corrupt header in multimember file."; +const char * const trailing_msg = "Trailing data not allowed."; +const char * const mem_msg = "Not enough memory."; + +// defined in compress.cc +int readblock( const int fd, uint8_t * const buf, const int size ); +int writeblock( const int fd, const uint8_t * const buf, const int size ); +void xinit_mutex( pthread_mutex_t * const mutex ); +void xinit_cond( pthread_cond_t * const cond ); +void xdestroy_mutex( pthread_mutex_t * const mutex ); +void xdestroy_cond( pthread_cond_t * const cond ); +void xlock( pthread_mutex_t * const mutex ); +void xunlock( pthread_mutex_t * const mutex ); +void xwait( pthread_cond_t * const cond, pthread_mutex_t * const mutex ); +void xsignal( pthread_cond_t * const cond ); +void xbroadcast( pthread_cond_t * const cond ); +int compress( const unsigned long long cfile_size, + const int data_size, const int dictionary_size, + const int match_len_limit, const int num_workers, + const int infd, const int outfd, + const Pretty_print & pp, const int debug_level ); + +// defined in lzip_index.cc +class Lzip_index; // forward declaration + +// defined in dec_stdout.cc +int dec_stdout( const int num_workers, const int infd, const int outfd, + const Pretty_print & pp, const int debug_level, + const int out_slots, const Lzip_index & lzip_index ); + +// defined in dec_stream.cc +int dec_stream( const unsigned long long cfile_size, const int num_workers, + const int infd, const int outfd, const Cl_options & cl_opts, + const Pretty_print & pp, const int debug_level, + const int in_slots, const int out_slots ); + +// defined in decompress.cc +int preadblock( const int fd, uint8_t * const buf, const int size, + const long long pos ); +class Shared_retval; +void decompress_error( struct LZ_Decoder * const decoder, + const Pretty_print & pp, + Shared_retval & shared_retval, const int worker_id ); +void show_results( const unsigned long long in_size, + const unsigned long long out_size, + const unsigned dictionary_size, const bool testing ); +int decompress( const unsigned long long cfile_size, int num_workers, + const int infd, const int outfd, const Cl_options & cl_opts, + const Pretty_print & pp, const int debug_level, + const int in_slots, const int out_slots, + const bool infd_isreg, const bool one_to_one ); + +// defined in list.cc +int list_files( const std::vector< std::string > & filenames, + const Cl_options & cl_opts ); + +// defined in main.cc +struct stat; +const char * bad_version( const unsigned version ); +const char * format_ds( const unsigned dictionary_size ); +void show_header( const unsigned dictionary_size ); +int open_instream( const char * const name, struct stat * const in_statsp, + const bool one_to_one, const bool reg_only = false ); +void cleanup_and_fail( const int retval = 1 ); // terminate the program +void show_error( const char * const msg, const int errcode = 0, + const bool help = false ); +void show_file_error( const char * const filename, const char * const msg, + const int errcode = 0 ); +void internal_error( const char * const msg ); +void show_progress( const unsigned long long packet_size, + const unsigned long long cfile_size = 0, + const Pretty_print * const p = 0 ); + + +class Slot_tally + { + const int num_slots; // total slots + int num_free; // remaining free slots + pthread_mutex_t mutex; + pthread_cond_t slot_av; // slot available + + Slot_tally( const Slot_tally & ); // declared as private + void operator=( const Slot_tally & ); // declared as private + +public: + explicit Slot_tally( const int slots ) + : num_slots( slots ), num_free( slots ) + { xinit_mutex( &mutex ); xinit_cond( &slot_av ); } + + ~Slot_tally() { xdestroy_cond( &slot_av ); xdestroy_mutex( &mutex ); } + + bool all_free() { return num_free == num_slots; } + + void get_slot() // wait for a free slot + { + xlock( &mutex ); + while( num_free <= 0 ) xwait( &slot_av, &mutex ); + --num_free; + xunlock( &mutex ); + } + + void leave_slot() // return a slot to the tally + { + xlock( &mutex ); + if( ++num_free == 1 ) xsignal( &slot_av ); // num_free was 0 + xunlock( &mutex ); + } + }; + + +class Shared_retval // shared return value protected by a mutex + { + int retval; + pthread_mutex_t mutex; + + Shared_retval( const Shared_retval & ); // declared as private + void operator=( const Shared_retval & ); // declared as private + +public: + Shared_retval() : retval( 0 ) { xinit_mutex( &mutex ); } + + bool set_value( const int val ) // only one thread can set retval > 0 + { // (and print an error message) + xlock( &mutex ); + const bool done = ( retval == 0 && val > 0 ); + if( done ) retval = val; + xunlock( &mutex ); + return done; + } + + int operator()() const { return retval; } + }; |