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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __DATABLOCK_H__
#define __DATABLOCK_H__
class DiskFile;
// A Data Block is a block of data of a specific length at a specific
// offset in a specific file.
// It may be either a block of data in a source file from which recovery
// data is being computed, a block of recovery data in a recovery file, or
// a block in a target file that is being reconstructed.
class DataBlock
{
public:
DataBlock(void);
~DataBlock(void);
public:
// Set the length of the block
void SetLength(u64 length);
// Set the location of the block
void SetLocation(DiskFile *diskfile, u64 offset);
void ClearLocation(void);
public:
// Check to see if the location of the block has been set
bool IsSet(void) const;
// Which disk file is this data block in
DiskFile* GetDiskFile(void) const;
// What offset is the block located at
u64 GetOffset(void) const;
// What is the length of this block
u64 GetLength(void) const;
public:
// Open the disk file if it is not already open (so that it can be read)
bool Open(void);
// Read some of the data from disk into memory.
bool ReadData(u64 position, size_t size, void *buffer);
// Write some of the data from memory to disk
bool WriteData(u64 position, size_t size, const void *buffer, size_t &wrote);
protected:
DiskFile *diskfile; // Which disk file is the block associated with
u64 offset; // What is the file offset
u64 length; // How large is the block
};
// Construct the data block
inline DataBlock::DataBlock(void)
{
diskfile = 0;
offset = 0;
length = 0;
}
// Destroy the data block
inline DataBlock::~DataBlock(void)
{
}
// Set the length of the block
inline void DataBlock::SetLength(u64 _length)
{
length = _length;
}
// Set the location of the block
inline void DataBlock::SetLocation(DiskFile *_diskfile, u64 _offset)
{
diskfile = _diskfile;
offset = _offset;
}
// Clear the location of the block
inline void DataBlock::ClearLocation(void)
{
diskfile = 0;
offset = 0;
}
// Check to see of the location is known
inline bool DataBlock::IsSet(void) const
{
return (diskfile != 0);
}
// Which disk file is this data block in
inline DiskFile* DataBlock::GetDiskFile(void) const
{
return diskfile;
}
// What offset is the block located at
inline u64 DataBlock::GetOffset(void) const
{
return offset;
}
// What is the length of this block
inline u64 DataBlock::GetLength(void) const
{
return length;
}
#endif // __DATABLOCK_H__
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