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92 lines
2.9 KiB
C++
92 lines
2.9 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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// Construct the creator packet.
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// The only external information required to complete construction is
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// the set_id_hash (which is normally computed from information in the
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// main packet).
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bool CreatorPacket::Create(const MD5Hash &setid)
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{
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string creator = "Created by " PACKAGE " version " VERSION ".";
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// Allocate a packet just large enough for creator name
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CREATORPACKET *packet = (CREATORPACKET *)AllocatePacket(sizeof(*packet) + (~3 & (3+(u32)creator.size())));
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// Fill in the details the we know
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packet->header.magic = packet_magic;
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packet->header.length = packetlength;
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//packet->header.hash; // Compute shortly
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packet->header.setid = setid;
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packet->header.type = creatorpacket_type;
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// Copy the creator description into the packet
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memcpy(packet->client, creator.c_str(), creator.size());
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// Compute the packet hash
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MD5Context packetcontext;
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packetcontext.Update(&packet->header.setid, packetlength - offsetof(PACKET_HEADER, setid));
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packetcontext.Final(packet->header.hash);
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return true;
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}
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// Load the packet from disk.
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bool CreatorPacket::Load(DiskFile *diskfile, u64 offset, PACKET_HEADER &header)
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{
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// Is the packet long enough
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if (header.length <= sizeof(CREATORPACKET))
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{
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return false;
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}
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// Is the packet too large (what is the longest reasonable creator description)
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if (header.length - sizeof(CREATORPACKET) > 100000)
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{
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return false;
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}
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// Allocate the packet (with a little extra so we will have NULLs after the description)
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CREATORPACKET *packet = (CREATORPACKET *)AllocatePacket((size_t)header.length, 4);
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packet->header = header;
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// Load the rest of the packet from disk
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return diskfile->Read(offset + sizeof(PACKET_HEADER),
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packet->client,
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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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