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123 lines
3.8 KiB
C++
123 lines
3.8 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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#include "Util.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 packet and store the filename and size.
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bool DescriptionPacket::Create(string filename, u64 filesize)
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{
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// Allocate some extra bytes for the packet in memory so that strlen() can
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// be used on the filename. The extra bytes do not get written to disk.
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FILEDESCRIPTIONPACKET *packet = (FILEDESCRIPTIONPACKET *)AllocatePacket(sizeof(*packet) + (~3 & (3 + (u32)filename.size())), 4);
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// Store everything that is currently known 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 = filedescriptionpacket_type;
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//packet->fileid; // Not known yet
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//packet->hashfull; // Not known yet
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//packet->hash16k; // Not known yet
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packet->length = filesize;
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memcpy(packet->name, filename.c_str(), filename.size());
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return true;
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}
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void DescriptionPacket::Hash16k(const MD5Hash &hash)
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{
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((FILEDESCRIPTIONPACKET *)packetdata)->hash16k = hash;
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}
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void DescriptionPacket::HashFull(const MD5Hash &hash)
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{
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((FILEDESCRIPTIONPACKET *)packetdata)->hashfull = hash;
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}
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void DescriptionPacket::ComputeFileId(void)
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{
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FILEDESCRIPTIONPACKET *packet = ((FILEDESCRIPTIONPACKET *)packetdata);
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// Compute the fileid from the hash, length, and name fields in the packet.
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MD5Context context;
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context.Update(&packet->hash16k,
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sizeof(FILEDESCRIPTIONPACKET)-offsetof(FILEDESCRIPTIONPACKET,hash16k)
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+strlen((const char*)packet->name));
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context.Final(packet->fileid);
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}
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// Load a description packet from a specified file
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bool DescriptionPacket::Load(DiskFile *diskfile, u64 offset, PACKET_HEADER &header)
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{
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// Is the packet big enough
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if (header.length <= sizeof(FILEDESCRIPTIONPACKET))
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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 permissible filename)
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if (header.length - sizeof(FILEDESCRIPTIONPACKET) > 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 filename)
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FILEDESCRIPTIONPACKET *packet = (FILEDESCRIPTIONPACKET *)AllocatePacket((size_t)header.length, 4);
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packet->header = header;
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// Read the rest of the packet from disk
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if (!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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return false;
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filename = *WebUtil::Latin1ToUtf8((char*)((FILEDESCRIPTIONPACKET*)packetdata)->name);
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// Are the file and 16k hashes consistent
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if (packet->length <= 16384 && packet->hash16k != packet->hashfull)
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{
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return false;
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}
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return true;
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}
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} // end namespace Par2
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