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// This file is part of par2cmdline (a PAR 2.0 compatible file verification and
// repair tool). See http://parchive.sourceforge.net for details of PAR 2.0.
//
// Copyright (c) 2003 Peter Brian Clements
//
// par2cmdline is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// par2cmdline 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 General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#include "nzbget.h"
#include "par2cmdline.h"
#include "Util.h"
#ifdef _MSC_VER
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
#endif
namespace Par2
{
// Construct the packet and store the filename and size.
bool DescriptionPacket::Create(string filename, u64 filesize)
{
// Allocate some extra bytes for the packet in memory so that strlen() can
// be used on the filename. The extra bytes do not get written to disk.
FILEDESCRIPTIONPACKET *packet = (FILEDESCRIPTIONPACKET *)AllocatePacket(sizeof(*packet) + (~3 & (3 + (u32)filename.size())), 4);
// Store everything that is currently known in the packet.
packet->header.magic = packet_magic;
packet->header.length = packetlength;
//packet->header.hash; // Not known yet
//packet->header.setid; // Not known yet
packet->header.type = filedescriptionpacket_type;
//packet->fileid; // Not known yet
//packet->hashfull; // Not known yet
//packet->hash16k; // Not known yet
packet->length = filesize;
memcpy(packet->name, filename.c_str(), filename.size());
return true;
}
void DescriptionPacket::Hash16k(const MD5Hash &hash)
{
((FILEDESCRIPTIONPACKET *)packetdata)->hash16k = hash;
}
void DescriptionPacket::HashFull(const MD5Hash &hash)
{
((FILEDESCRIPTIONPACKET *)packetdata)->hashfull = hash;
}
void DescriptionPacket::ComputeFileId(void)
{
FILEDESCRIPTIONPACKET *packet = ((FILEDESCRIPTIONPACKET *)packetdata);
// Compute the fileid from the hash, length, and name fields in the packet.
MD5Context context;
context.Update(&packet->hash16k,
sizeof(FILEDESCRIPTIONPACKET)-offsetof(FILEDESCRIPTIONPACKET,hash16k)
+strlen((const char*)packet->name));
context.Final(packet->fileid);
}
// Load a description packet from a specified file
bool DescriptionPacket::Load(DiskFile *diskfile, u64 offset, PACKET_HEADER &header)
{
// Is the packet big enough
if (header.length <= sizeof(FILEDESCRIPTIONPACKET))
{
return false;
}
// Is the packet too large (what is the longest permissible filename)
if (header.length - sizeof(FILEDESCRIPTIONPACKET) > 100000)
{
return false;
}
// Allocate the packet (with a little extra so we will have NULLs after the filename)
FILEDESCRIPTIONPACKET *packet = (FILEDESCRIPTIONPACKET *)AllocatePacket((size_t)header.length, 4);
packet->header = header;
// Read the rest of the packet from disk
if (!diskfile->Read(offset + sizeof(PACKET_HEADER),
&packet->fileid,
(size_t)packet->header.length - sizeof(PACKET_HEADER)))
return false;
filename = *WebUtil::Latin1ToUtf8((char*)((FILEDESCRIPTIONPACKET*)packetdata)->name);
// Are the file and 16k hashes consistent
if (packet->length <= 16384 && packet->hash16k != packet->hashfull)
{
return false;
}
return true;
}
} // end namespace Par2
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