diff options
Diffstat (limited to 'decompress.cc')
| -rw-r--r-- | decompress.cc | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/decompress.cc b/decompress.cc new file mode 100644 index 0000000..5b0e68f --- /dev/null +++ b/decompress.cc @@ -0,0 +1,363 @@ +/* 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 <string> +#include <vector> +#include <stdint.h> +#include <unistd.h> +#include <sys/stat.h> +#include <lzlib.h> + +#include "lzip.h" +#include "lzip_index.h" + + +/* This code is based on a patch by Hannes Domani, <ssbssa@yahoo.de> to make + possible compiling plzip under MS Windows (with MINGW compiler). +*/ +#if defined __MSVCRT__ && defined WITH_MINGW +#include <windows.h> +#warning "Parallel I/O is not guaranteed to work on Windows." + +ssize_t pread( int fd, void *buf, size_t count, uint64_t offset ) + { + OVERLAPPED o = {0,0,0,0,0}; + HANDLE fh = (HANDLE)_get_osfhandle(fd); + DWORD bytes; + BOOL ret; + + if( fh == INVALID_HANDLE_VALUE ) { errno = EBADF; return -1; } + o.Offset = offset & 0xffffffff; + o.OffsetHigh = (offset >> 32) & 0xffffffff; + ret = ReadFile( fh, buf, (DWORD)count, &bytes, &o ); + if( !ret ) { errno = EIO; return -1; } + return (ssize_t)bytes; + } + +ssize_t pwrite( int fd, const void *buf, size_t count, uint64_t offset ) + { + OVERLAPPED o = {0,0,0,0,0}; + HANDLE fh = (HANDLE)_get_osfhandle(fd); + DWORD bytes; + BOOL ret; + + if( fh == INVALID_HANDLE_VALUE ) { errno = EBADF; return -1; } + o.Offset = offset & 0xffffffff; + o.OffsetHigh = (offset >> 32) & 0xffffffff; + ret = WriteFile(fh, buf, (DWORD)count, &bytes, &o); + if( !ret ) { errno = EIO; return -1; } + return (ssize_t)bytes; + } + +#endif // __MSVCRT__ + + +/* Return the number of bytes really read. + If (value returned < size) and (errno == 0), means EOF was reached. +*/ +int preadblock( const int fd, uint8_t * const buf, const int size, + const long long pos ) + { + int sz = 0; + errno = 0; + while( sz < size ) + { + const int n = pread( fd, buf + sz, size - sz, pos + sz ); + if( n > 0 ) sz += n; + else if( n == 0 ) break; // EOF + else if( errno != EINTR ) break; + errno = 0; + } + return sz; + } + + +/* Return the number of bytes really written. + If (value returned < size), it is always an error. +*/ +int pwriteblock( const int fd, const uint8_t * const buf, const int size, + const long long pos ) + { + int sz = 0; + errno = 0; + while( sz < size ) + { + const int n = pwrite( fd, buf + sz, size - sz, pos + sz ); + if( n > 0 ) sz += n; + else if( n < 0 && errno != EINTR ) break; + errno = 0; + } + return sz; + } + + +void decompress_error( struct LZ_Decoder * const decoder, + const Pretty_print & pp, + Shared_retval & shared_retval, const int worker_id ) + { + const LZ_Errno errcode = LZ_decompress_errno( decoder ); + const int retval = ( errcode == LZ_header_error || errcode == LZ_data_error || + errcode == LZ_unexpected_eof ) ? 2 : 1; + if( !shared_retval.set_value( retval ) ) return; + pp(); + if( verbosity >= 0 ) + std::fprintf( stderr, "%s in worker %d\n", LZ_strerror( errcode ), + worker_id ); + } + + +void show_results( const unsigned long long in_size, + const unsigned long long out_size, + const unsigned dictionary_size, const bool testing ) + { + if( verbosity >= 2 ) + { + if( verbosity >= 4 ) show_header( dictionary_size ); + if( out_size == 0 || in_size == 0 ) + std::fputs( "no data compressed. ", stderr ); + else + std::fprintf( stderr, "%6.3f:1, %5.2f%% ratio, %5.2f%% saved. ", + (double)out_size / in_size, + ( 100.0 * in_size ) / out_size, + 100.0 - ( ( 100.0 * in_size ) / out_size ) ); + if( verbosity >= 3 ) + std::fprintf( stderr, "%9llu out, %8llu in. ", out_size, in_size ); + } + if( verbosity >= 1 ) std::fputs( testing ? "ok\n" : "done\n", stderr ); + } + + +namespace { + +struct Worker_arg + { + const Lzip_index * lzip_index; + const Pretty_print * pp; + Shared_retval * shared_retval; + int worker_id; + int num_workers; + int infd; + int outfd; + bool nocopy; // avoid copying decompressed data when testing + }; + + +/* Read members from input file, decompress their contents, and write to + output file the data produced. +*/ +extern "C" void * dworker( void * arg ) + { + const Worker_arg & tmp = *(const Worker_arg *)arg; + const Lzip_index & lzip_index = *tmp.lzip_index; + const Pretty_print & pp = *tmp.pp; + Shared_retval & shared_retval = *tmp.shared_retval; + const int worker_id = tmp.worker_id; + const int num_workers = tmp.num_workers; + const int infd = tmp.infd; + const int outfd = tmp.outfd; + const bool nocopy = tmp.nocopy; + const int buffer_size = 65536; + + uint8_t * const ibuffer = new( std::nothrow ) uint8_t[buffer_size]; + uint8_t * const obuffer = + nocopy ? 0 : new( std::nothrow ) uint8_t[buffer_size]; + LZ_Decoder * const decoder = LZ_decompress_open(); + if( !ibuffer || ( !nocopy && !obuffer ) || !decoder || + LZ_decompress_errno( decoder ) != LZ_ok ) + { if( shared_retval.set_value( 1 ) ) { pp( mem_msg ); } goto done; } + + for( long i = worker_id; i < lzip_index.members(); i += num_workers ) + { + long long data_pos = lzip_index.dblock( i ).pos(); + long long data_rest = lzip_index.dblock( i ).size(); + long long member_pos = lzip_index.mblock( i ).pos(); + long long member_rest = lzip_index.mblock( i ).size(); + + while( member_rest > 0 ) + { + if( shared_retval() ) goto done; // other worker found a problem + while( LZ_decompress_write_size( decoder ) > 0 ) + { + const int size = std::min( LZ_decompress_write_size( decoder ), + (int)std::min( (long long)buffer_size, member_rest ) ); + if( size > 0 ) + { + if( preadblock( infd, ibuffer, size, member_pos ) != size ) + { if( shared_retval.set_value( 1 ) ) + { pp(); show_error( "Read error", errno ); } goto done; } + member_pos += size; + member_rest -= size; + if( LZ_decompress_write( decoder, ibuffer, size ) != size ) + internal_error( "library error (LZ_decompress_write)." ); + } + if( member_rest <= 0 ) { LZ_decompress_finish( decoder ); break; } + } + while( true ) // write decompressed data to file + { + const int rd = LZ_decompress_read( decoder, obuffer, buffer_size ); + if( rd < 0 ) + { decompress_error( decoder, pp, shared_retval, worker_id ); + goto done; } + if( rd > 0 && outfd >= 0 ) + { + const int wr = pwriteblock( outfd, obuffer, rd, data_pos ); + if( wr != rd ) + { + if( shared_retval.set_value( 1 ) ) { pp(); + if( verbosity >= 0 ) + std::fprintf( stderr, "Write error in worker %d: %s\n", + worker_id, std::strerror( errno ) ); } + goto done; + } + } + if( rd > 0 ) + { + data_pos += rd; + data_rest -= rd; + } + if( LZ_decompress_finished( decoder ) == 1 ) + { + if( data_rest != 0 ) + internal_error( "final data_rest is not zero." ); + LZ_decompress_reset( decoder ); // prepare for new member + break; + } + if( rd == 0 ) break; + } + } + show_progress( lzip_index.mblock( i ).size() ); + } +done: + if( obuffer ) { delete[] obuffer; } delete[] ibuffer; + 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; + } + +} // end namespace + + +// start the workers and wait for them to finish. +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 ) + { + if( !infd_isreg ) + return dec_stream( cfile_size, num_workers, infd, outfd, cl_opts, pp, + debug_level, in_slots, out_slots ); + + const Lzip_index lzip_index( infd, cl_opts ); + if( lzip_index.retval() == 1 ) // decompress as stream if seek fails + { + lseek( infd, 0, SEEK_SET ); + return dec_stream( cfile_size, num_workers, infd, outfd, cl_opts, pp, + debug_level, in_slots, out_slots ); + } + if( lzip_index.retval() != 0 ) // corrupt or invalid input file + { + if( lzip_index.bad_magic() ) + show_file_error( pp.name(), lzip_index.error().c_str() ); + else pp( lzip_index.error().c_str() ); + return lzip_index.retval(); + } + + if( num_workers > lzip_index.members() ) num_workers = lzip_index.members(); + + if( outfd >= 0 ) + { + struct stat st; + if( !one_to_one || fstat( outfd, &st ) != 0 || !S_ISREG( st.st_mode ) || + lseek( outfd, 0, SEEK_CUR ) < 0 ) + { + if( debug_level & 2 ) std::fputs( "decompress file to stdout.\n", stderr ); + if( verbosity >= 1 ) pp(); + show_progress( 0, cfile_size, &pp ); // init + return dec_stdout( num_workers, infd, outfd, pp, debug_level, out_slots, + lzip_index ); + } + } + + if( debug_level & 2 ) std::fputs( "decompress file to file.\n", stderr ); + if( verbosity >= 1 ) pp(); + show_progress( 0, cfile_size, &pp ); // init + + 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 + + Shared_retval shared_retval; + int i = 0; // number of workers started + for( ; i < num_workers; ++i ) + { + worker_args[i].lzip_index = &lzip_index; + worker_args[i].pp = &pp; + worker_args[i].shared_retval = &shared_retval; + worker_args[i].worker_id = i; + worker_args[i].num_workers = num_workers; + worker_args[i].infd = infd; + worker_args[i].outfd = outfd; + worker_args[i].nocopy = nocopy; + const int errcode = + pthread_create( &worker_threads[i], 0, dworker, &worker_args[i] ); + if( errcode ) + { if( shared_retval.set_value( 1 ) ) + { show_error( "Can't create worker threads", errcode ); } break; } + } + + while( --i >= 0 ) + { + const int 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 + + if( verbosity >= 1 ) + show_results( lzip_index.cdata_size(), lzip_index.udata_size(), + lzip_index.dictionary_size(), outfd < 0 ); + + if( debug_level & 1 ) + std::fprintf( stderr, + "workers started %8u\n", num_workers ); + + return 0; + } |