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/*************************************************
* DataSource Header File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#ifndef BOTAN_DATA_SRC_H__
#define BOTAN_DATA_SRC_H__
#include <botan/base.h>
#include <iosfwd>
namespace Botan {
/*************************************************
* Generic DataSource Interface *
*************************************************/
class DataSource
{
public:
virtual u32bit read(byte[], u32bit) = 0;
virtual u32bit peek(byte[], u32bit, u32bit) const = 0;
virtual bool end_of_data() const = 0;
virtual std::string id() const { return ""; }
u32bit read_byte(byte&);
u32bit peek_byte(byte&) const;
u32bit discard_next(u32bit);
DataSource() {}
virtual ~DataSource() {}
private:
DataSource& operator=(const DataSource&) { return (*this); }
DataSource(const DataSource&);
};
/*************************************************
* Memory-Based DataSource *
*************************************************/
class DataSource_Memory : public DataSource
{
public:
u32bit read(byte[], u32bit);
u32bit peek(byte[], u32bit, u32bit) const;
bool end_of_data() const;
DataSource_Memory(const std::string&);
DataSource_Memory(const byte[], u32bit);
DataSource_Memory(const MemoryRegion<byte>&);
private:
SecureVector<byte> source;
u32bit offset;
};
/*************************************************
* Stream-Based DataSource *
*************************************************/
class DataSource_Stream : public DataSource
{
public:
u32bit read(byte[], u32bit);
u32bit peek(byte[], u32bit, u32bit) const;
bool end_of_data() const;
std::string id() const;
DataSource_Stream(std::istream&, const std::string& id = "");
DataSource_Stream(const std::string&, bool = false);
~DataSource_Stream();
private:
const std::string identifier;
const bool owner;
std::istream* source;
u32bit total_read;
};
}
#endif
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