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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* [email protected] *
* *
* This program 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. *
* *
* This program 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 <klocale.h>
#include <util/file.h>
#include <util/error.h>
#include <util/fileops.h>
#include <util/sha1hash.h>
#include "dndfile.h"
namespace bt
{
const Uint32 DND_FILE_HDR_MAGIC = 0xD1234567;
struct DNDFileHeader
{
Uint32 magic;
Uint32 first_size;
Uint32 last_size;
Uint8 data_sha1[20];
};
DNDFile::DNDFile(const QString & path) : path(path)
{}
DNDFile::~DNDFile()
{}
void DNDFile::changePath(const QString & npath)
{
path = npath;
}
void DNDFile::checkIntegrity()
{
File fptr;
if (!fptr.open(path,"rb"))
{
create();
return;
}
DNDFileHeader hdr;
if (fptr.read(&hdr,sizeof(DNDFileHeader)) != sizeof(DNDFileHeader))
{
create();
return;
}
if (hdr.magic != DND_FILE_HDR_MAGIC && bt::FileSize(path) != sizeof(DNDFileHeader) + hdr.first_size + hdr.last_size)
{
create();
return;
}
#if 0
if (hdr.first_size > 0 || hdr.last_size > 0)
{
// check hash
Uint32 data_size = hdr.first_size + hdr.last_size;
Uint8* buf = new Uint8[data_size];
if (fptr.read(buf,data_size) != data_size)
{
delete [] buf;
create();
return;
}
if (SHA1Hash::generate(buf,data_size) != SHA1Hash(hdr.data_sha1))
{
delete [] buf;
create();
return;
}
delete [] buf;
}
#endif
}
void DNDFile::create()
{
DNDFileHeader hdr;
hdr.magic = DND_FILE_HDR_MAGIC;
hdr.first_size = 0;
hdr.last_size = 0;
memset(hdr.data_sha1,0,20);
File fptr;
if (!fptr.open(path,"wb"))
throw Error(i18n("Cannot create file %1 : %2").arg(path).arg(fptr.errorString()));
fptr.write(&hdr,sizeof(DNDFileHeader));
fptr.close();
}
Uint32 DNDFile::readFirstChunk(Uint8* buf,Uint32 off,Uint32 buf_size)
{
File fptr;
if (!fptr.open(path,"rb"))
{
create();
return 0;
}
DNDFileHeader hdr;
if (fptr.read(&hdr,sizeof(DNDFileHeader)) != sizeof(DNDFileHeader))
{
create();
return 0;
}
if (hdr.first_size == 0)
return 0;
if (hdr.first_size + off > buf_size)
return 0;
return fptr.read(buf + off,hdr.first_size);
}
Uint32 DNDFile::readLastChunk(Uint8* buf,Uint32 off,Uint32 buf_size)
{
File fptr;
if (!fptr.open(path,"rb"))
{
create();
return 0;
}
DNDFileHeader hdr;
if (fptr.read(&hdr,sizeof(DNDFileHeader)) != sizeof(DNDFileHeader))
{
create();
return 0;
}
if (hdr.last_size == 0)
return 0;
if (hdr.last_size + off > buf_size)
return 0;
fptr.seek(File::BEGIN,sizeof(DNDFileHeader) + hdr.first_size);
return fptr.read(buf + off,hdr.last_size);
}
void DNDFile::writeFirstChunk(const Uint8* buf,Uint32 fc_size)
{
File fptr;
if (!fptr.open(path,"r+b"))
{
create();
if (!fptr.open(path,"r+b"))
{
throw Error(i18n("Failed to write first chunk to DND file : %1").arg(fptr.errorString()));
}
}
DNDFileHeader hdr;
fptr.read(&hdr,sizeof(DNDFileHeader));
if (hdr.last_size == 0)
{
hdr.first_size = fc_size;
fptr.seek(File::BEGIN,0);
// update hash first
// SHA1Hash h = SHA1Hash::generate(buf,fc_size);
// memcpy(hdr.data_sha1,h.getData(),20);
// write header
fptr.write(&hdr,sizeof(DNDFileHeader));
// write data
fptr.write(buf,fc_size);
}
else
{
hdr.first_size = fc_size;
Uint8* tmp = new Uint8[hdr.first_size + hdr.last_size];
try
{
// put everything in tmp buf
memcpy(tmp,buf,hdr.first_size);
fptr.seek(File::BEGIN,sizeof(DNDFileHeader) + hdr.first_size);
fptr.read(tmp + hdr.first_size,hdr.last_size);
// update the hash of the header
// SHA1Hash h = SHA1Hash::generate(tmp,hdr.first_size + hdr.last_size);
// memcpy(hdr.data_sha1,h.getData(),20);
// write header + data
fptr.seek(File::BEGIN,0);
fptr.write(&hdr,sizeof(DNDFileHeader));
fptr.write(tmp,hdr.first_size + hdr.last_size);
delete [] tmp;
}
catch (...)
{
delete [] tmp;
throw;
}
}
}
void DNDFile::writeLastChunk(const Uint8* buf,Uint32 lc_size)
{
File fptr;
if (!fptr.open(path,"r+b"))
{
create();
if (!fptr.open(path,"r+b"))
{
throw Error(i18n("Failed to write last chunk to DND file : %1").arg(fptr.errorString()));
}
}
DNDFileHeader hdr;
fptr.read(&hdr,sizeof(DNDFileHeader));
hdr.last_size = lc_size;
Uint8* tmp = new Uint8[hdr.first_size + hdr.last_size];
try
{
// put everything in tmp buf
memcpy(tmp + hdr.first_size,buf,lc_size);
if (hdr.first_size > 0)
{
fptr.seek(File::BEGIN,sizeof(DNDFileHeader));
fptr.read(tmp,hdr.first_size);
}
// update the hash of the header
// SHA1Hash h = SHA1Hash::generate(tmp,hdr.first_size + hdr.last_size);
// memcpy(hdr.data_sha1,h.getData(),20);
// write header + data
fptr.seek(File::BEGIN,0);
fptr.write(&hdr,sizeof(DNDFileHeader));
fptr.write(tmp,hdr.first_size + hdr.last_size);
delete [] tmp;
}
catch (...)
{
delete [] tmp;
throw;
}
}
}
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