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 //------------------------------------------------------------------------------
 // Copyright (c) 2011-2014 by European Organization for Nuclear Research (CERN)
 // Author: Michal Simon <michal.simon@cern.ch>
 //------------------------------------------------------------------------------
 // This file is part of the XRootD software suite.
 //
 // XRootD 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 3 of the License, or
 // (at your option) any later version.
 //
 // XRootD 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 Lesser General Public License
 // along with XRootD.  If not, see <http://www.gnu.org/licenses/>.
 //
 // In applying this licence, CERN does not waive the privileges and immunities
 // granted to it by virtue of its status as an Intergovernmental Organization
 // or submit itself to any jurisdiction.
 //------------------------------------------------------------------------------
 
 #ifndef SRC_XRDZIP_XRDZIPCDFH_HH_
 #define SRC_XRDZIP_XRDZIPCDFH_HH_
 
 #include "XrdZip/XrdZipLFH.hh"
 #include "XrdZip/XrdZipUtils.hh"
 #include "XrdZip/XrdZipDataDescriptor.hh"
 
 #include <string>
 #include <algorithm>
 #include <iterator>
 #include <unordered_map>
 #include <memory>
 #include <tuple>
 
 #include <sys/types.h>
 
 namespace XrdZip
 {
   //---------------------------------------------------------------------------
   // Forward declaration for CDFH
   //---------------------------------------------------------------------------
   struct CDFH;
 
   //---------------------------------------------------------------------------
   // Vector of Central Directory records
   //---------------------------------------------------------------------------
   typedef std::vector<std::unique_ptr<CDFH>> cdvec_t;
 
   //---------------------------------------------------------------------------
   // Map file name to index of CD record
   //---------------------------------------------------------------------------
   typedef std::unordered_map<std::string, size_t> cdmap_t;
 
   //---------------------------------------------------------------------------
   // Map of Central Directory records
   //---------------------------------------------------------------------------
   typedef std::unordered_map<std::string, std::unique_ptr<CDFH>> cdrecs_t;
 
   //---------------------------------------------------------------------------
   // A data structure representing the Central Directory File header record
   //---------------------------------------------------------------------------
   struct CDFH
   {
     //-------------------------------------------------------------------------
     // Parse central directory
     // @param buffer      : buffer containing the CD records
     // @param bufferSize  : size of the buffer
     // @param nbCdRecords : nb of CD records
     // @return            : vector of CD records / file name to index mapping
     //-------------------------------------------------------------------------
     inline static std::tuple<cdvec_t, cdmap_t> Parse( const char *buffer, uint32_t bufferSize, uint16_t nbCdRecords )
     {
       uint32_t offset = 0;
       cdvec_t cdvec;
       cdmap_t cdmap;
       cdvec.reserve( nbCdRecords );
 
       for( size_t i = 0; i < nbCdRecords; ++i )
       {
         if( bufferSize < cdfhBaseSize ) break;
         // check the signature
         uint32_t signature = to<uint32_t>( buffer + offset );
         if( signature != cdfhSign ) throw bad_data();
         // parse the record
         std::unique_ptr<CDFH> cdfh( new CDFH( buffer + offset, bufferSize ) );
         offset     += cdfh->cdfhSize;
         bufferSize -= cdfh->cdfhSize;
         cdmap[cdfh->filename] = i;
         cdvec.push_back( std::move( cdfh ) );
       }
 
       return std::make_tuple( std::move( cdvec ), std::move( cdmap ) );
     }
 
     //-------------------------------------------------------------------------
     // Parse central directory
     // @param buffer      : buffer containing the CD records
     // @param bufferSize  : size of the buffer
     // @return            : vector of CD records / file name to index mapping
     //-------------------------------------------------------------------------
     inline static std::tuple<cdvec_t, cdmap_t> Parse( const char *&buffer, uint32_t bufferSize )
     {
       cdvec_t cdvec;
       cdmap_t cdmap;
       size_t i = 0;
       while( bufferSize > 0 )
       {
         if( bufferSize < sizeof( uint32_t ) ) throw bad_data();
         // check the signature
         uint32_t signature = to<uint32_t>( buffer );
         if( signature != cdfhSign )
           return std::make_tuple( std::move( cdvec ), std::move( cdmap ) );
         // parse the record
         std::unique_ptr<CDFH> cdfh( new CDFH( buffer ) );
         if( bufferSize < cdfh->cdfhSize ) throw bad_data();
         buffer     += cdfh->cdfhSize;
         bufferSize -= cdfh->cdfhSize;
         cdmap[cdfh->filename] = i++;
         cdvec.push_back( std::move( cdfh ) );
       }
 
       return std::make_tuple( std::move( cdvec ), std::move( cdmap ) );
     }
 
     //---------------------------------------------------------------------------
     // Calculate size of the Central Directory
     //---------------------------------------------------------------------------
     inline static size_t CalcSize( const cdvec_t &cdvec, uint32_t orgcdsz, uint32_t orgcdcnt )
     {
       size_t size = 0;
       auto itr = cdvec.begin() + orgcdcnt;
       for( ; itr != cdvec.end() ; ++itr )
       {
         CDFH *cdfh = itr->get();
         size += cdfh->cdfhSize;
       }
       return size + orgcdsz;
     }
 
     inline static void Serialize( uint32_t         orgcdcnt,
                                   const buffer_t  &orgcdbuf,
                                   const cdvec_t   &cdvec,
                                   buffer_t        &buffer )
     {
       std::copy( orgcdbuf.begin(), orgcdbuf.end(), std::back_inserter( buffer ) );
       auto itr = cdvec.begin() + orgcdcnt;
       for( ; itr != cdvec.end() ; ++itr )
       {
         CDFH *cdfh = itr->get();
         cdfh->Serialize( buffer );
       }
     }
 
     //-------------------------------------------------------------------------
     // Constructor from Local File Header
     //-------------------------------------------------------------------------
     CDFH( LFH *lfh, mode_t mode, uint64_t lfhOffset ):
       zipVersion( ( 3 << 8 ) | 63 ),
       generalBitFlag( lfh->generalBitFlag ),
       compressionMethod( lfh->compressionMethod ),
       timestmp( lfh->timestmp ),
       ZCRC32( lfh->ZCRC32 ),
       compressedSize( lfh->compressedSize ),
       uncompressedSize( lfh->uncompressedSize ),
       filenameLength( lfh->filenameLength ),
       commentLength( 0 ),
       nbDisk( 0 ),
       internAttr( 0 ),
       externAttr( mode << 16 ),
       filename( lfh->filename ),
       extra( new Extra( lfh->extra.get(), lfhOffset ) )
     {
       if ( lfhOffset >= ovrflw<uint32_t>::value )
         offset = ovrflw<uint32_t>::value;
       else
         offset = lfhOffset;
 
       extraLength = extra->totalSize;
 
       if ( extraLength == 0 )
         minZipVersion = 10;
       else
         minZipVersion = 45;
 
       cdfhSize = cdfhBaseSize + filenameLength + extraLength + commentLength;
     }
 
     //-------------------------------------------------------------------------
     // Constructor from buffer
     //-------------------------------------------------------------------------
     CDFH( const char *buffer, const uint32_t maxSize = 0 )
     {
       zipVersion        = to<uint16_t>(buffer + 4);
       minZipVersion     = to<uint16_t>(buffer + 6);
       generalBitFlag    = to<uint16_t>(buffer + 8);
       compressionMethod = to<uint16_t>(buffer + 10);
       timestmp.time     = to<uint16_t>(buffer + 12);
       timestmp.date     = to<uint16_t>(buffer + 14);
       ZCRC32            = to<uint32_t>(buffer + 16);
       compressedSize    = to<uint32_t>(buffer + 20);
       uncompressedSize  = to<uint32_t>(buffer + 24);
       filenameLength    = to<uint16_t>(buffer + 28);
       extraLength       = to<uint16_t>(buffer + 30);
       commentLength     = to<uint16_t>(buffer + 32);
       nbDisk            = to<uint16_t>(buffer + 34);
       internAttr        = to<uint16_t>(buffer + 36);
       externAttr        = to<uint32_t>(buffer + 38);
       offset            = to<uint32_t>(buffer + 42);
       if(maxSize > 0 && (uint32_t)(cdfhBaseSize+filenameLength + extraLength + commentLength) > maxSize){
           throw bad_data();
       }
       filename.assign( buffer + 46, filenameLength );
 
       // now parse the 'extra' (may contain the zip64 extension to CDFH)
       ParseExtra( buffer + 46 + filenameLength, extraLength );
 
       cdfhSize = cdfhBaseSize + filenameLength + extraLength + commentLength;
     }
 
     //-------------------------------------------------------------------------
     // Choose the right offset value from the CDFH record
     //-------------------------------------------------------------------------
     inline static uint64_t GetOffset( const CDFH &cdfh )
     {
       if( cdfh.offset != ovrflw<uint32_t>::value )
         return cdfh.offset;
       return cdfh.extra->offset;
     }
 
     //-------------------------------------------------------------------------
     // Parse the extensible data fields
     //-------------------------------------------------------------------------
     void ParseExtra( const char *buffer, uint16_t length)
     {
       uint8_t ovrflws = Extra::NONE;
       uint16_t exsize = 0;
 
       // check if compressed size is overflown
       if( compressedSize == ovrflw<uint32_t>::value)
       {
         ovrflws |= Extra::CPMSIZE;
         exsize  += sizeof( uint64_t );
       }
 
       // check if original size is overflown
       if( uncompressedSize == ovrflw<uint32_t>::value )
       {
         ovrflws |= Extra::UCMPSIZE;
         exsize  += sizeof( uint64_t );
       }
 
       // check if offset is overflown
       if( offset == ovrflw<uint32_t>::value )
       {
         ovrflws |= Extra::OFFSET;
         exsize  += sizeof( uint64_t );
       }
 
       // check if number of disks is overflown
       if( nbDisk == ovrflw<uint16_t>::value )
       {
         ovrflws |= Extra::NBDISK;
         exsize  += sizeof( uint32_t );
       }
 
       // if the expected size of ZIP64 extension is 0 we
       // can skip parsing of 'extra'
       if( exsize == 0 ) return;
 
       // Parse the extra part
       buffer = Extra::Find( buffer, length );
       if( buffer )
       {
         extra.reset( new Extra() );
         extra->FromBuffer( buffer, exsize, ovrflws );
       }
     }
 
     //-------------------------------------------------------------------------
     //! Serialize the object into a buffer
     //-------------------------------------------------------------------------
     void Serialize( buffer_t        &buffer )
     {
       copy_bytes( cdfhSign, buffer );
       copy_bytes( zipVersion, buffer );
       copy_bytes( minZipVersion, buffer );
       copy_bytes( generalBitFlag, buffer );
       copy_bytes( compressionMethod, buffer );
       copy_bytes( timestmp.time, buffer );
       copy_bytes( timestmp.date, buffer );
       copy_bytes( ZCRC32, buffer );
       copy_bytes( compressedSize, buffer );
       copy_bytes( uncompressedSize, buffer );
       copy_bytes( filenameLength, buffer );
       copy_bytes( extraLength, buffer );
       copy_bytes( commentLength, buffer );
       copy_bytes( nbDisk, buffer );
       copy_bytes( internAttr, buffer );
       copy_bytes( externAttr, buffer );
       copy_bytes( offset, buffer );
       std::copy( filename.begin(), filename.end(), std::back_inserter( buffer ) );
       if( extra )
         extra->Serialize( buffer );
 
       if ( commentLength > 0 )
         std::copy( comment.begin(), comment.end(), std::back_inserter( buffer ) );
     }
 
     //-------------------------------------------------------------------------
     //! @return : true if ZIP64 extension is present, false otherwise
     //-------------------------------------------------------------------------
     inline bool IsZIP64() const
     {
       return extra.get();
     }
 
     //-------------------------------------------------------------------------
     //! @return : true if the data descriptor flag is on, false otherwise
     //-------------------------------------------------------------------------
     bool HasDataDescriptor()
     {
       return generalBitFlag & DataDescriptor::flag;
     }
 
     uint16_t                zipVersion;        // ZIP version
     uint16_t                minZipVersion;     //< minumum ZIP version
     uint16_t                generalBitFlag;    //< flags
     uint16_t                compressionMethod; //< compression method
     dos_timestmp            timestmp;          //< DOS timestamp
     uint32_t                ZCRC32;            //< CRC32
     uint32_t                compressedSize;    //< compressed size
     uint32_t                uncompressedSize;  //< uncompressed size
     uint16_t                filenameLength;    //< filename length
     uint16_t                extraLength;       //< size of the ZIP64 extra field
     uint16_t                commentLength;     //< comment length
     uint16_t                nbDisk;            //< number of disks
     uint16_t                internAttr;        //< internal attributes
     uint32_t                externAttr;        //< external attributes
     uint32_t                offset;            //< offset
     std::string             filename;          //< file name
     std::unique_ptr<Extra>  extra;             //< ZIP64 extra field
     std::string             comment;           //< user comment
     uint16_t                cdfhSize;          // size of the record
 
     //-------------------------------------------------------------------------
     // the Central Directory File Header signature
     //-------------------------------------------------------------------------
     static const uint32_t cdfhSign = 0x02014b50;
     static const uint16_t cdfhBaseSize = 46;
   };
 }
 
 #endif /* SRC_XRDZIP_XRDZIPCDFH_HH_ */

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