ziphead.cpp

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#include "zipios-config.h"

#include "meta-iostreams.h"
#include <iterator>
#include <string>
#include <cassert>

#include "zipios_common.h"
#include "ziphead.h"
#include "zipheadio.h"
#include "zipios_defs.h"

#include "outputstringstream.h"

namespace zipios {

using std::ios ;

bool operator== ( const ZipLocalEntry &zlh, const ZipCDirEntry &ze ) {
  // Not all fields need to be identical. Some of the information
  // may be put in a data descriptor that trails the compressed
  // data, according to the specs (The trailing data descriptor
  // can contain crc_32, compress_size and uncompress_size.)

  // Experience has shown that extra_field and extra_field_len
  // can differ too.

//    cerr << "----- BEGIN -----" << endl ;
//    cerr << ( zlh.extract_version == ze.extract_version     ) << endl ; 
//    cerr << ( zlh.gp_bitfield     == ze.gp_bitfield         ) << endl ; 
//    cerr << ( zlh.compress_method == ze.compress_method     ) << endl ; 
//    cerr << ( zlh.last_mod_ftime  == ze.last_mod_ftime      ) << endl ; 
//    cerr << ( zlh.last_mod_fdate  == ze.last_mod_fdate      ) << endl ; 

//    cerr << ( zlh.filename_len    == ze.filename_len        ) << endl ; 
  
//    cerr << ( zlh.filename        == ze.filename            ) << endl ; 
//    cerr << "----- END -----" << endl ;
  return ( zlh.extract_version == ze.extract_version     &&
           zlh.gp_bitfield     == ze.gp_bitfield         &&
           zlh.compress_method == ze.compress_method     &&
           zlh.last_mod_ftime  == ze.last_mod_ftime      &&
           zlh.last_mod_fdate  == ze.last_mod_fdate      &&
           zlh.filename_len    == ze.filename_len        &&
           
           zlh.filename        == ze.filename               ) ;
}

//
// ZipLocalEntry methods
//

const uint32 ZipLocalEntry::signature = 0x04034b50 ;



ZipCDirEntry &ZipCDirEntry::operator=( const class ZipCDirEntry &src ) {
  writer_version      = src.writer_version      ;
  extract_version     = src.extract_version     ;
  gp_bitfield         = src.gp_bitfield         ;
  compress_method     = src.compress_method     ;
  last_mod_ftime      = src.last_mod_ftime      ;
  last_mod_fdate      = src.last_mod_fdate      ;
  crc_32              = src.crc_32              ;
  compress_size       = src.compress_size       ; 
  uncompress_size     = src.uncompress_size     ;
  filename_len        = src.filename_len        ;
  extra_field_len     = src.extra_field_len     ;
  file_comment_len    = src.file_comment_len    ; 
  disk_num_start      = src.disk_num_start      ;
  intern_file_attr    = src.intern_file_attr    ;
  extern_file_attr    = src.extern_file_attr    ;
  rel_offset_loc_head = src.rel_offset_loc_head ;

  filename     = src.filename     ;
  extra_field  = src.extra_field  ; 
  file_comment = src.file_comment ;

  return *this ;
}

bool EndOfCentralDirectory::checkSignature ( uint32 sig ) const {
  return signature == sig ;
}

void ZipLocalEntry::setDefaultExtract() {
  extract_version = 20 ; // version number
}

string ZipLocalEntry::getComment() const {
  return "" ; // No comment in a local entry
}

uint32 ZipLocalEntry::getCompressedSize() const {
  return compress_size ;
}

uint32 ZipLocalEntry::getCrc() const {
  return crc_32 ;
}

vector< unsigned char > ZipLocalEntry::getExtra() const {
  return extra_field ;
}

StorageMethod ZipLocalEntry::getMethod() const {
  return static_cast< StorageMethod >( compress_method ) ;
}

string ZipLocalEntry::getName() const {
  return filename ;
}

string ZipLocalEntry::getFileName() const {
  if ( isDirectory() )
    return string() ;
  string::size_type pos ;
  pos = filename.find_last_of( separator ) ;
  if ( pos != string::npos ) { // separator found!
    // isDirectory() check means pos should not be last, so pos+1 is ok 
    return filename.substr( pos + 1 ) ;
  } else {
    return filename ;
  }
}

uint32 ZipLocalEntry::getSize() const {
  return uncompress_size ;
}

int ZipLocalEntry::getTime() const {
  return ( last_mod_fdate << 16 ) + last_mod_ftime ; 
  // FIXME: what to do with this time date thing? (not only here?)
}

bool ZipLocalEntry::isValid() const {
  return _valid ;
}

bool ZipLocalEntry::isDirectory() const {
  //std::assert( filename.size() != 0 ) ;
  return  filename[ filename.size() - 1 ] == separator ;
}


void ZipLocalEntry::setComment( const string & ) {
  // A local entry cannot hold a comment
}

void ZipLocalEntry::setCompressedSize( uint32 size ) {
  compress_size = size ;
}

void ZipLocalEntry::setCrc( uint32 crc ) {
  crc_32 = crc ;
}

void ZipLocalEntry::setExtra( const vector< unsigned char > &extra ) {
  extra_field = extra ;
  extra_field_len = extra_field.size() ;
}

void ZipLocalEntry::setMethod( StorageMethod method ) {
  compress_method = static_cast< uint16 >( method ) ;
}

void ZipLocalEntry::setName( const string &name ) {
  filename = name ;
  filename_len = filename.size() ;
}

void ZipLocalEntry::setSize( uint32 size ) {
  uncompress_size = size ;
}

void ZipLocalEntry::setTime( int time ) {
  // FIXME: fix time setting here, and ind flist and elsewhere. Define the
  // date time semantics before mucking about - how surprising

  // Mark Donszelmann: added these lines to make zip work for winzip
  last_mod_fdate = (time >> 16) & 0x0000FFFF;
  last_mod_ftime = time & 0x0000FFFF;
}

string ZipLocalEntry::toString() const {
  OutputStringStream sout ;
  sout << filename << " (" << uncompress_size << " bytes, " ;
  sout << compress_size << " bytes compressed)" ;
  return sout.str() ;
}

int ZipLocalEntry::getLocalHeaderSize() const {
  return 30 + filename.size() + extra_field.size() ;
}

bool ZipLocalEntry::trailingDataDescriptor() const {
  // gp_bitfield bit 3 is one, if this entry uses a trailing data
  // descriptor to keep size, compressed size and crc-32
  // fields.
  if ( ( gp_bitfield & 4 ) == 1 )
    return true ;
  else
    return false ;
}

FileEntry *ZipLocalEntry::clone() const {
  return new ZipLocalEntry( *this ) ;
}


//
// ZipCDirEntry methods
//

const uint32 ZipCDirEntry::signature = 0x02014b50 ;

void ZipCDirEntry::setDefaultWriter() {
  writer_version = 0 ;
#ifdef WIN32
    writer_version |= static_cast< uint16 >( 0 ) << 8 ; // Windows, DOS
#else
    writer_version |= static_cast< uint16 >( 3 ) << 8 ; // Unix
#endif
    writer_version |= 20 ; // version number
}

string ZipCDirEntry::getComment() const {
  return file_comment ;
}

uint32 ZipCDirEntry::getLocalHeaderOffset() const {
  return rel_offset_loc_head ;
}

void ZipCDirEntry::setLocalHeaderOffset( uint32 offset ) {
  rel_offset_loc_head = offset ;
}


void ZipCDirEntry::setComment( const string &comment ) {
  file_comment = comment ;
  file_comment_len = file_comment.size() ;
}


string ZipCDirEntry::toString() const {
  OutputStringStream sout ;
  sout << filename << " (" << uncompress_size << " bytes, " ;
  sout << compress_size << " bytes compressed)" ;
  return sout.str() ;
}


int ZipCDirEntry::getCDirHeaderSize() const {
  return 46 + filename.size() + extra_field.size() + file_comment.size() ;
}


FileEntry *ZipCDirEntry::clone() const {
  return new ZipCDirEntry( *this ) ;
}


//
// EndOfCentralDirectory methods
//

const uint32 EndOfCentralDirectory::signature = 0x06054b50 ;

bool EndOfCentralDirectory::read( vector<unsigned char> &buf, int pos ) {
  if ( ( buf.size() - pos < sizeof( uint32 ) )   || 
       ( ! checkSignature( &( buf[ pos ] ) ) )     )
    return false ;

  eocd_offset_from_end = buf.size() - pos ;
  pos += sizeof( uint32 ) ;
  disk_num         = ztohs( &( buf[ pos  ] ) ) ; pos += sizeof( uint16 ) ;
  cdir_disk_num    = ztohs( &( buf[ pos  ] ) ) ; pos += sizeof( uint16 ) ;
  cdir_entries     = ztohs( &( buf[ pos  ] ) ) ; pos += sizeof( uint16 ) ;
  cdir_tot_entries = ztohs( &( buf[ pos  ] ) ) ; pos += sizeof( uint16 ) ;
  cdir_size        = ztohl( &( buf[ pos  ] ) ) ; pos += sizeof( uint32 ) ;
  cdir_offset      = ztohl( &( buf[ pos  ] ) ) ; pos += sizeof( uint32 ) ;
  zip_comment_len  = ztohs( &( buf[ pos  ] ) ) ; pos += sizeof( uint16 ) ;
//    cerr << "Zip comment length = " << zip_comment_len << endl ;
//    cerr << "Length of remaining file = " << buf.size() - pos << endl ;

  return true ; // Dummy
}

bool EndOfCentralDirectory::checkSignature ( unsigned char *buf ) const {
//    cerr << "potential header: " << ztohl( buf ) << endl ;
  return checkSignature( ztohl( buf ) ) ;
}



} // namespace



/*
  Zipios++ - a small C++ library that provides easy access to .zip files.
  Copyright (C) 2000  Thomas Søndergaard
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.
  
  This library 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
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/