diff options
Diffstat (limited to 'dec_stream.cc')
| -rw-r--r-- | dec_stream.cc | 650 |
1 files changed, 650 insertions, 0 deletions
diff --git a/dec_stream.cc b/dec_stream.cc new file mode 100644 index 0000000..6ea4ed7 --- /dev/null +++ b/dec_stream.cc @@ -0,0 +1,650 @@ +/* Plzip - Massively parallel implementation of lzip + Copyright (C) 2009 Laszlo Ersek. + 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/>. +*/ + +#define _FILE_OFFSET_BITS 64 + +#include <algorithm> +#include <cerrno> +#include <climits> +#include <csignal> +#include <cstdio> +#include <cstdlib> +#include <cstring> +#include <queue> +#include <string> +#include <vector> +#include <stdint.h> +#include <unistd.h> +#include <lzlib.h> + +#include "lzip.h" + +/* When a problem is detected by any thread: + - the thread sets shared_retval to 1 or 2. + - the splitter sets eof and returns. + - the courier discards new packets received or collected. + - the workers drain the queue and return. + - the muxer drains the queue and returns. + (Draining seems to be faster than cleaning up later). */ + +namespace { + +enum { max_packet_size = 1 << 20 }; +unsigned long long in_size = 0; +unsigned long long out_size = 0; + + +struct Packet // data block + { + uint8_t * data; // data may be null if size == 0 + int size; // number of bytes in data (if any) + bool eom; // end of member + Packet() : data( 0 ), size( 0 ), eom( true ) {} + Packet( uint8_t * const d, const int s, const bool e ) + : data( d ), size( s ), eom ( e ) {} + ~Packet() { if( data ) delete[] data; } + }; + + +class Packet_courier // moves packets around + { +public: + unsigned icheck_counter; + unsigned iwait_counter; + unsigned ocheck_counter; + unsigned owait_counter; +private: + int receive_worker_id; // worker queue currently receiving packets + int deliver_worker_id; // worker queue currently delivering packets + Slot_tally slot_tally; // limits the number of input packets + std::vector< std::queue< const Packet * > > ipacket_queues; + std::vector< std::queue< const Packet * > > opacket_queues; + int num_working; // number of workers still running + const int num_workers; // number of workers + const unsigned out_slots; // max output packets per queue + pthread_mutex_t imutex; + pthread_cond_t iav_or_eof; // input packet available or splitter done + pthread_mutex_t omutex; + pthread_cond_t oav_or_exit; // output packet available or all workers exited + std::vector< pthread_cond_t > slot_av; // output slot available + const Shared_retval & shared_retval; // discard new packets on error + bool eof; // splitter done + bool trailing_data_found_; // a worker found trailing data + + Packet_courier( const Packet_courier & ); // declared as private + void operator=( const Packet_courier & ); // declared as private + +public: + Packet_courier( const Shared_retval & sh_ret, const int workers, + const int in_slots, const int oslots ) + : icheck_counter( 0 ), iwait_counter( 0 ), + ocheck_counter( 0 ), owait_counter( 0 ), + receive_worker_id( 0 ), deliver_worker_id( 0 ), + slot_tally( in_slots ), ipacket_queues( workers ), + opacket_queues( workers ), num_working( workers ), + num_workers( workers ), out_slots( oslots ), slot_av( workers ), + shared_retval( sh_ret ), eof( false ), trailing_data_found_( false ) + { + xinit_mutex( &imutex ); xinit_cond( &iav_or_eof ); + xinit_mutex( &omutex ); xinit_cond( &oav_or_exit ); + for( unsigned i = 0; i < slot_av.size(); ++i ) xinit_cond( &slot_av[i] ); + } + + ~Packet_courier() + { + if( shared_retval() ) // cleanup to avoid memory leaks + for( int i = 0; i < num_workers; ++i ) + { + while( !ipacket_queues[i].empty() ) + { delete ipacket_queues[i].front(); ipacket_queues[i].pop(); } + while( !opacket_queues[i].empty() ) + { delete opacket_queues[i].front(); opacket_queues[i].pop(); } + } + for( unsigned i = 0; i < slot_av.size(); ++i ) xdestroy_cond( &slot_av[i] ); + xdestroy_cond( &oav_or_exit ); xdestroy_mutex( &omutex ); + xdestroy_cond( &iav_or_eof ); xdestroy_mutex( &imutex ); + } + + /* Make a packet with data received from splitter. + If eom == true (end of member), move to next queue. */ + void receive_packet( uint8_t * const data, const int size, const bool eom ) + { + if( shared_retval() ) { delete[] data; return; } // discard packet on error + const Packet * const ipacket = new Packet( data, size, eom ); + slot_tally.get_slot(); // wait for a free slot + xlock( &imutex ); + ipacket_queues[receive_worker_id].push( ipacket ); + xbroadcast( &iav_or_eof ); + xunlock( &imutex ); + if( eom && ++receive_worker_id >= num_workers ) receive_worker_id = 0; + } + + // distribute a packet to a worker + const Packet * distribute_packet( const int worker_id ) + { + const Packet * ipacket = 0; + xlock( &imutex ); + ++icheck_counter; + while( ipacket_queues[worker_id].empty() && !eof ) + { + ++iwait_counter; + xwait( &iav_or_eof, &imutex ); + } + if( !ipacket_queues[worker_id].empty() ) + { + ipacket = ipacket_queues[worker_id].front(); + ipacket_queues[worker_id].pop(); + } + xunlock( &imutex ); + if( ipacket ) slot_tally.leave_slot(); + else // no more packets + { + xlock( &omutex ); // notify muxer when last worker exits + if( --num_working == 0 ) xsignal( &oav_or_exit ); + xunlock( &omutex ); + } + return ipacket; + } + + // collect a packet from a worker, discard packet on error + void collect_packet( const Packet * const opacket, const int worker_id ) + { + xlock( &omutex ); + if( opacket->data ) + while( opacket_queues[worker_id].size() >= out_slots ) + { + if( shared_retval() ) { delete opacket; goto done; } + xwait( &slot_av[worker_id], &omutex ); + } + opacket_queues[worker_id].push( opacket ); + if( worker_id == deliver_worker_id ) xsignal( &oav_or_exit ); +done: + xunlock( &omutex ); + } + + /* deliver a packet to muxer + if packet->eom, move to next queue + if packet data == 0, wait again */ + const Packet * deliver_packet() + { + const Packet * opacket = 0; + xlock( &omutex ); + ++ocheck_counter; + while( true ) + { + while( opacket_queues[deliver_worker_id].empty() && num_working > 0 ) + { + ++owait_counter; + xwait( &oav_or_exit, &omutex ); + } + if( opacket_queues[deliver_worker_id].empty() ) break; + opacket = opacket_queues[deliver_worker_id].front(); + opacket_queues[deliver_worker_id].pop(); + if( opacket_queues[deliver_worker_id].size() + 1 == out_slots ) + xsignal( &slot_av[deliver_worker_id] ); + if( opacket->eom && ++deliver_worker_id >= num_workers ) + deliver_worker_id = 0; + if( opacket->data ) break; + delete opacket; opacket = 0; + } + xunlock( &omutex ); + return opacket; + } + + void add_sizes( const unsigned long long partial_in_size, + const unsigned long long partial_out_size ) + { + xlock( &imutex ); + in_size += partial_in_size; + out_size += partial_out_size; + xunlock( &imutex ); + } + + void set_trailing_flag() { trailing_data_found_ = true; } + bool trailing_data_found() { return trailing_data_found_; } + + void finish( const int workers_started ) + { + xlock( &imutex ); // splitter has no more packets to send + eof = true; + xbroadcast( &iav_or_eof ); + xunlock( &imutex ); + xlock( &omutex ); // notify muxer if all workers have exited + num_working -= num_workers - workers_started; // workers spared + if( num_working <= 0 ) xsignal( &oav_or_exit ); + xunlock( &omutex ); + } + + bool finished() // all packets delivered to muxer + { + if( !slot_tally.all_free() || !eof || num_working != 0 ) return false; + for( int i = 0; i < num_workers; ++i ) + if( !ipacket_queues[i].empty() ) return false; + for( int i = 0; i < num_workers; ++i ) + if( !opacket_queues[i].empty() ) return false; + return true; + } + }; + + +struct Worker_arg + { + Packet_courier * courier; + const Pretty_print * pp; + Shared_retval * shared_retval; + int worker_id; + bool ignore_trailing; + bool loose_trailing; + bool testing; + bool nocopy; // avoid copying decompressed data when testing + }; + +struct Splitter_arg + { + struct Worker_arg worker_arg; + Worker_arg * worker_args; + pthread_t * worker_threads; + unsigned long long cfile_size; + int infd; + unsigned dictionary_size; // returned by splitter to main thread + int num_workers; // returned by splitter to main thread + }; + + +/* Consume packets from courier, decompress their contents and, if not + testing, give to courier the packets produced. +*/ +extern "C" void * dworker_s( void * arg ) + { + const Worker_arg & tmp = *(const Worker_arg *)arg; + Packet_courier & courier = *tmp.courier; + const Pretty_print & pp = *tmp.pp; + Shared_retval & shared_retval = *tmp.shared_retval; + const int worker_id = tmp.worker_id; + const bool ignore_trailing = tmp.ignore_trailing; + const bool loose_trailing = tmp.loose_trailing; + const bool testing = tmp.testing; + const bool nocopy = tmp.nocopy; + + unsigned long long partial_in_size = 0, partial_out_size = 0; + int new_pos = 0; + bool draining = false; // either trailing data or an error were found + uint8_t * new_data = 0; + LZ_Decoder * const decoder = LZ_decompress_open(); + if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok ) + { draining = true; if( shared_retval.set_value( 1 ) ) pp( mem_msg ); } + + while( true ) + { + const Packet * const ipacket = courier.distribute_packet( worker_id ); + if( !ipacket ) break; // no more packets to process + + int written = 0; + while( !draining ) // else discard trailing data or drain queue + { + if( LZ_decompress_write_size( decoder ) > 0 && written < ipacket->size ) + { + const int wr = LZ_decompress_write( decoder, ipacket->data + written, + ipacket->size - written ); + if( wr < 0 ) internal_error( "library error (LZ_decompress_write)." ); + written += wr; + if( written > ipacket->size ) + internal_error( "ipacket size exceeded in worker." ); + } + if( ipacket->eom && written == ipacket->size ) + LZ_decompress_finish( decoder ); + unsigned long long total_in = 0; // detect empty member + corrupt header + while( !draining ) // read and pack decompressed data + { + if( !nocopy && !new_data && + !( new_data = new( std::nothrow ) uint8_t[max_packet_size] ) ) + { draining = true; if( shared_retval.set_value( 1 ) ) pp( mem_msg ); + break; } + const int rd = LZ_decompress_read( decoder, + nocopy ? 0 : new_data + new_pos, + max_packet_size - new_pos ); + if( rd < 0 ) // trailing data or decoder error + { + draining = true; + const enum LZ_Errno lz_errno = LZ_decompress_errno( decoder ); + if( lz_errno == LZ_header_error ) + { + courier.set_trailing_flag(); + if( !ignore_trailing ) + { if( shared_retval.set_value( 2 ) ) pp( trailing_msg ); } + } + else if( lz_errno == LZ_data_error && + LZ_decompress_member_position( decoder ) == 0 ) + { + courier.set_trailing_flag(); + if( !loose_trailing ) + { if( shared_retval.set_value( 2 ) ) pp( corrupt_mm_msg ); } + else if( !ignore_trailing ) + { if( shared_retval.set_value( 2 ) ) pp( trailing_msg ); } + } + else + decompress_error( decoder, pp, shared_retval, worker_id ); + } + else new_pos += rd; + if( new_pos > max_packet_size ) + internal_error( "opacket size exceeded in worker." ); + if( LZ_decompress_member_finished( decoder ) == 1 ) + { + partial_in_size += LZ_decompress_member_position( decoder ); + partial_out_size += LZ_decompress_data_position( decoder ); + } + const bool eom = draining || LZ_decompress_finished( decoder ) == 1; + if( new_pos == max_packet_size || eom ) + { + if( !testing ) // make data packet + { + const Packet * const opacket = + new Packet( ( new_pos > 0 ) ? new_data : 0, new_pos, eom ); + courier.collect_packet( opacket, worker_id ); + if( new_pos > 0 ) new_data = 0; + } + new_pos = 0; + if( eom ) + { LZ_decompress_reset( decoder ); // prepare for new member + break; } + } + if( rd == 0 ) + { + const unsigned long long size = LZ_decompress_total_in_size( decoder ); + if( total_in == size ) break; else total_in = size; + } + } + if( !ipacket->data || written == ipacket->size ) break; + } + delete ipacket; + } + + if( new_data ) delete[] new_data; + courier.add_sizes( partial_in_size, partial_out_size ); + if( LZ_decompress_member_position( decoder ) != 0 && + shared_retval.set_value( 1 ) ) + pp( "Error, some data remains in decoder." ); + if( LZ_decompress_close( decoder ) < 0 && shared_retval.set_value( 1 ) ) + pp( "LZ_decompress_close failed." ); + return 0; + } + + +bool start_worker( const Worker_arg & worker_arg, + Worker_arg * const worker_args, + pthread_t * const worker_threads, const int worker_id, + Shared_retval & shared_retval ) + { + worker_args[worker_id] = worker_arg; + worker_args[worker_id].worker_id = worker_id; + const int errcode = pthread_create( &worker_threads[worker_id], 0, + dworker_s, &worker_args[worker_id] ); + if( errcode && shared_retval.set_value( 1 ) ) + show_error( "Can't create worker threads", errcode ); + return errcode == 0; + } + + +/* Split data from input file into chunks and pass them to courier for + packaging and distribution to workers. + Start a worker per member up to a maximum of num_workers. +*/ +extern "C" void * dsplitter_s( void * arg ) + { + Splitter_arg & tmp = *(Splitter_arg *)arg; + const Worker_arg & worker_arg = tmp.worker_arg; + Packet_courier & courier = *worker_arg.courier; + const Pretty_print & pp = *worker_arg.pp; + Shared_retval & shared_retval = *worker_arg.shared_retval; + Worker_arg * const worker_args = tmp.worker_args; + pthread_t * const worker_threads = tmp.worker_threads; + const int infd = tmp.infd; + int worker_id = 0; // number of workers started + const int hsize = Lzip_header::size; + const int tsize = Lzip_trailer::size; + const int buffer_size = max_packet_size; + // buffer with room for trailer, header, data, and sentinel "LZIP" + const int base_buffer_size = tsize + hsize + buffer_size + 4; + uint8_t * const base_buffer = new( std::nothrow ) uint8_t[base_buffer_size]; + if( !base_buffer ) + { +mem_fail: + if( shared_retval.set_value( 1 ) ) pp( mem_msg ); +fail: + delete[] base_buffer; + courier.finish( worker_id ); // no more packets to send + tmp.num_workers = worker_id; + return 0; + } + uint8_t * const buffer = base_buffer + tsize; + + int size = readblock( infd, buffer, buffer_size + hsize ) - hsize; + bool at_stream_end = ( size < buffer_size ); + if( size != buffer_size && errno ) + { if( shared_retval.set_value( 1 ) ) + { pp(); show_error( "Read error", errno ); } goto fail; } + if( size + hsize < min_member_size ) + { if( shared_retval.set_value( 2 ) ) show_file_error( pp.name(), + ( size <= 0 ) ? "File ends unexpectedly at member header." : + "Input file is too short." ); goto fail; } + const Lzip_header & header = *(const Lzip_header *)buffer; + if( !header.check_magic() ) + { if( shared_retval.set_value( 2 ) ) + { show_file_error( pp.name(), bad_magic_msg ); } goto fail; } + if( !header.check_version() ) + { if( shared_retval.set_value( 2 ) ) + { pp( bad_version( header.version() ) ); } goto fail; } + tmp.dictionary_size = header.dictionary_size(); + if( !isvalid_ds( tmp.dictionary_size ) ) + { if( shared_retval.set_value( 2 ) ) { pp( bad_dict_msg ); } goto fail; } + if( verbosity >= 1 ) pp(); + show_progress( 0, tmp.cfile_size, &pp ); // init + + unsigned long long partial_member_size = 0; + bool worker_pending = true; // start 1 worker per first packet of member + while( true ) + { + if( shared_retval() ) break; // stop sending packets on error + int pos = 0; // current searching position + std::memcpy( buffer + hsize + size, lzip_magic, 4 ); // sentinel + for( int newpos = 1; newpos <= size; ++newpos ) + { + while( buffer[newpos] != lzip_magic[0] || + buffer[newpos+1] != lzip_magic[1] || + buffer[newpos+2] != lzip_magic[2] || + buffer[newpos+3] != lzip_magic[3] ) ++newpos; + if( newpos <= size ) + { + const Lzip_trailer & trailer = + *(const Lzip_trailer *)(buffer + newpos - tsize); + const unsigned long long member_size = trailer.member_size(); + if( partial_member_size + newpos - pos == member_size && + trailer.check_consistency() ) + { // header found + const Lzip_header & header = *(const Lzip_header *)(buffer + newpos); + if( !header.check_version() ) + { if( shared_retval.set_value( 2 ) ) + { pp( bad_version( header.version() ) ); } goto fail; } + const unsigned dictionary_size = header.dictionary_size(); + if( !isvalid_ds( dictionary_size ) ) + { if( shared_retval.set_value( 2 ) ) pp( bad_dict_msg ); + goto fail; } + if( tmp.dictionary_size < dictionary_size ) + tmp.dictionary_size = dictionary_size; + uint8_t * const data = new( std::nothrow ) uint8_t[newpos - pos]; + if( !data ) goto mem_fail; + std::memcpy( data, buffer + pos, newpos - pos ); + courier.receive_packet( data, newpos - pos, true ); // eom + partial_member_size = 0; + pos = newpos; + if( worker_pending ) + { if( !start_worker( worker_arg, worker_args, worker_threads, + worker_id, shared_retval ) ) goto fail; + ++worker_id; } + worker_pending = worker_id < tmp.num_workers; + show_progress( member_size ); + } + } + } + + if( at_stream_end ) + { + uint8_t * data = new( std::nothrow ) uint8_t[size + hsize - pos]; + if( !data ) goto mem_fail; + std::memcpy( data, buffer + pos, size + hsize - pos ); + courier.receive_packet( data, size + hsize - pos, true ); // eom + if( worker_pending && + start_worker( worker_arg, worker_args, worker_threads, + worker_id, shared_retval ) ) ++worker_id; + break; + } + if( pos < buffer_size ) + { + partial_member_size += buffer_size - pos; + uint8_t * data = new( std::nothrow ) uint8_t[buffer_size - pos]; + if( !data ) goto mem_fail; + std::memcpy( data, buffer + pos, buffer_size - pos ); + courier.receive_packet( data, buffer_size - pos, false ); + if( worker_pending ) + { if( !start_worker( worker_arg, worker_args, worker_threads, + worker_id, shared_retval ) ) break; + ++worker_id; worker_pending = false; } + } + if( courier.trailing_data_found() ) break; + std::memcpy( base_buffer, base_buffer + buffer_size, tsize + hsize ); + size = readblock( infd, buffer + hsize, buffer_size ); + at_stream_end = ( size < buffer_size ); + if( size != buffer_size && errno ) + { if( shared_retval.set_value( 1 ) ) + { pp(); show_error( "Read error", errno ); } break; } + } + delete[] base_buffer; + courier.finish( worker_id ); // no more packets to send + tmp.num_workers = worker_id; + return 0; + } + + +/* Get from courier the processed and sorted packets, and write their + contents to the output file. Drain queue on error. +*/ +void muxer( Packet_courier & courier, const Pretty_print & pp, + Shared_retval & shared_retval, const int outfd ) + { + while( true ) + { + const Packet * const opacket = courier.deliver_packet(); + if( !opacket ) break; // queue is empty. all workers exited + + if( shared_retval() == 0 && + writeblock( outfd, opacket->data, opacket->size ) != opacket->size && + shared_retval.set_value( 1 ) ) + { pp(); show_error( "Write error", errno ); } + delete opacket; + } + } + +} // end namespace + + +/* Init the courier, then start the splitter and the workers and, if not + testing, call the muxer. +*/ +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 ) + { + const int total_in_slots = ( INT_MAX / num_workers >= in_slots ) ? + num_workers * in_slots : INT_MAX; + in_size = 0; + out_size = 0; + Shared_retval shared_retval; + Packet_courier courier( shared_retval, num_workers, total_in_slots, out_slots ); + + if( debug_level & 2 ) std::fputs( "decompress stream.\n", stderr ); + + Worker_arg * worker_args = new( std::nothrow ) Worker_arg[num_workers]; + pthread_t * worker_threads = new( std::nothrow ) pthread_t[num_workers]; + if( !worker_args || !worker_threads ) + { pp( mem_msg ); delete[] worker_threads; delete[] worker_args; return 1; } + +#if defined LZ_API_VERSION && LZ_API_VERSION >= 1012 + const bool nocopy = ( outfd < 0 && LZ_api_version() >= 1012 ); +#else + const bool nocopy = false; +#endif + + Splitter_arg splitter_arg; + splitter_arg.worker_arg.courier = &courier; + splitter_arg.worker_arg.pp = &pp; + splitter_arg.worker_arg.shared_retval = &shared_retval; + splitter_arg.worker_arg.worker_id = 0; + splitter_arg.worker_arg.ignore_trailing = cl_opts.ignore_trailing; + splitter_arg.worker_arg.loose_trailing = cl_opts.loose_trailing; + splitter_arg.worker_arg.testing = ( outfd < 0 ); + splitter_arg.worker_arg.nocopy = nocopy; + splitter_arg.worker_args = worker_args; + splitter_arg.worker_threads = worker_threads; + splitter_arg.cfile_size = cfile_size; + splitter_arg.infd = infd; + splitter_arg.num_workers = num_workers; + + pthread_t splitter_thread; + int errcode = pthread_create( &splitter_thread, 0, dsplitter_s, &splitter_arg ); + if( errcode ) + { show_error( "Can't create splitter thread", errcode ); + delete[] worker_threads; delete[] worker_args; return 1; } + + if( outfd >= 0 ) muxer( courier, pp, shared_retval, outfd ); + + errcode = pthread_join( splitter_thread, 0 ); + if( errcode && shared_retval.set_value( 1 ) ) + show_error( "Can't join splitter thread", errcode ); + + for( int i = splitter_arg.num_workers; --i >= 0; ) + { // join only the workers started + errcode = pthread_join( worker_threads[i], 0 ); + if( errcode && shared_retval.set_value( 1 ) ) + show_error( "Can't join worker threads", errcode ); + } + delete[] worker_threads; + delete[] worker_args; + + if( shared_retval() ) return shared_retval(); // some thread found a problem + + show_results( in_size, out_size, splitter_arg.dictionary_size, outfd < 0 ); + + if( debug_level & 1 ) + { + std::fprintf( stderr, + "workers started %8u\n" + "any worker tried to consume from splitter %8u times\n" + "any worker had to wait %8u times\n", + splitter_arg.num_workers, + courier.icheck_counter, courier.iwait_counter ); + if( outfd >= 0 ) + std::fprintf( stderr, + "muxer tried to consume from workers %8u times\n" + "muxer had to wait %8u times\n", + courier.ocheck_counter, courier.owait_counter ); + } + + if( !courier.finished() ) internal_error( "courier not finished." ); + return 0; + } |