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// Copyright (C) 2003 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_BIT_STREAM_MULTi_1_
#define DLIB_BIT_STREAM_MULTi_1_
#include "bit_stream_multi_abstract.h"
namespace dlib
{
template <
typename bit_stream_base
>
class bit_stream_multi_1 : public bit_stream_base
{
public:
void multi_write (
unsigned long data,
int num_to_write
);
int multi_read (
unsigned long& data,
int num_to_read
);
};
template <
typename bit_stream_base
>
inline void swap (
bit_stream_multi_1<bit_stream_base>& a,
bit_stream_multi_1<bit_stream_base>& b
) { a.swap(b); }
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
// member function definitions
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
template <
typename bit_stream_base
>
void bit_stream_multi_1<bit_stream_base>::
multi_write (
unsigned long data,
int num_to_write
)
{
// move the first bit into the most significant position
data <<= 32 - num_to_write;
for (int i = 0; i < num_to_write; ++i)
{
// write the first bit from data
this->write(static_cast<char>(data >> 31));
// shift the next bit into position
data <<= 1;
}
}
// ----------------------------------------------------------------------------------------
template <
typename bit_stream_base
>
int bit_stream_multi_1<bit_stream_base>::
multi_read (
unsigned long& data,
int num_to_read
)
{
int bit, i;
data = 0;
for (i = 0; i < num_to_read; ++i)
{
// get a bit
if (this->read(bit) == false)
break;
// shift data to make room for this new bit
data <<= 1;
// put bit into the least significant position in data
data += static_cast<unsigned long>(bit);
}
return i;
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_BIT_STREAM_MULTi_1_
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