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https://github.com/nzbget/nzbget.git
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110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
// This file is part of par2cmdline (a PAR 2.0 compatible file verification and
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// repair tool). See http://parchive.sourceforge.net for details of PAR 2.0.
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//
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// Copyright (c) 2003 Peter Brian Clements
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//
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// par2cmdline is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// par2cmdline is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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#include "nzbget.h"
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#include "par2cmdline.h"
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#ifdef _MSC_VER
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#ifdef _DEBUG
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#undef THIS_FILE
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static char THIS_FILE[]=__FILE__;
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#define new DEBUG_NEW
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#endif
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#endif
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namespace Par2
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{
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// Create a packet large enough for the specified number of blocks
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bool VerificationPacket::Create(u32 _blockcount)
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{
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blockcount = _blockcount;
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// Allocate a packet large enough to hold the required number of verification entries.
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FILEVERIFICATIONPACKET *packet = (FILEVERIFICATIONPACKET*)AllocatePacket(sizeof(FILEVERIFICATIONPACKET) + blockcount * sizeof(FILEVERIFICATIONENTRY));
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// Record everything we know in the packet.
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packet->header.magic = packet_magic;
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packet->header.length = packetlength;
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//packet->header.hash; // Not known yet
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//packet->header.setid; // Not known yet
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packet->header.type = fileverificationpacket_type;
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//packet->fileid; // Not known yet
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//packet->entries; // Not known yet
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return true;
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}
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void VerificationPacket::FileId(const MD5Hash &fileid)
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{
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assert(packetdata != 0);
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// Store the fileid in the packet.
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((FILEVERIFICATIONPACKET*)packetdata)->fileid = fileid;
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}
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void VerificationPacket::SetBlockHashAndCRC(u32 blocknumber, const MD5Hash &hash, u32 crc)
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{
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assert(packetdata != 0);
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assert(blocknumber < blockcount);
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// Store the block hash and block crc in the packet.
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FILEVERIFICATIONENTRY &entry = ((FILEVERIFICATIONPACKET*)packetdata)->entries[blocknumber];
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entry.hash = hash;
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entry.crc = crc;
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}
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bool VerificationPacket::Load(DiskFile *diskfile, u64 offset, PACKET_HEADER &header)
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{
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// Is the packet large enough
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if (header.length <= sizeof(FILEVERIFICATIONPACKET))
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{
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return false;
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}
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// Does the packet have a whole number of verification records
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if (0 < ((header.length - sizeof(FILEVERIFICATIONPACKET)) % sizeof(FILEVERIFICATIONENTRY)))
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{
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return false;
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}
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// Is the packet too large
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if (header.length > sizeof(FILEVERIFICATIONPACKET) + 32768 * sizeof(FILEVERIFICATIONENTRY))
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{
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return false;
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}
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// Allocate the packet
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FILEVERIFICATIONPACKET *packet = (FILEVERIFICATIONPACKET*)AllocatePacket((size_t)header.length);
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packet->header = header;
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// How many blocks are there
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blockcount = (u32)((((FILEVERIFICATIONPACKET*)packetdata)->header.length - sizeof(FILEVERIFICATIONPACKET)) / sizeof(FILEVERIFICATIONENTRY));
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// Read the rest of the packet
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return diskfile->Read(offset + sizeof(PACKET_HEADER),
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&packet->fileid,
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(size_t)packet->header.length - sizeof(PACKET_HEADER));
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}
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} // end namespace Par2
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