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/* tnt/data.h
* Copyright (C) 2003 Tommi Maekitalo
*
* 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
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef TNT_DATA_H
#define TNT_DATA_H
#include <iostream>
namespace tnt
{
class DataChunk
{
const char* data;
unsigned len;
public:
DataChunk(const char* data_, const char* end_)
: data(data_),
len(end_ - data_)
{ }
DataChunk(const char* data_, unsigned len_)
: data(data_),
len(len_)
{ }
const char* getData() const { return data; }
unsigned getLength() const { return len; }
};
//////////////////////////////////////////////////////////////////////
// interpretes raw data as a data-structure with chunks
// unsigned: number of chunks
// count X unsigned: offsets
// data
//
class DataChunks
{
const char* dataObject;
const unsigned* udata() const
{
const char* d = dataObject;
return reinterpret_cast<const unsigned*>(d);
}
public:
DataChunks(const char* d)
: dataObject(d)
{ }
const char* data() const
{ return dataObject; }
// number of chunks
unsigned size() const
{ return (udata()[0] / sizeof(unsigned)) - 1; }
// offset of n-th chunk from start
unsigned offset(unsigned n) const
{ return udata()[n] - udata()[0]; }
// size of nth chunk in bytes
unsigned size(unsigned n) const
{ return udata()[n + 1] - udata()[n]; }
// pointer to n-th chunk
const char* ptr(unsigned n) const
{
const char* d = dataObject;
return d + udata()[n];
}
DataChunk operator[] (unsigned n) const
{ return DataChunk(ptr(n), size(n)); }
};
inline std::ostream& operator << (std::ostream& out, const DataChunk& c)
{
out.write(c.getData(), c.getLength());
return out;
}
}
#endif // TNT_DATA_H
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