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// bzip2stream Library License:
// --------------------------
//
// The zlib/libpng License Copyright (c) 2003 Jonathan de Halleux.
//
// This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution
//
// Author: Jonathan de Halleux, dehalleux@pelikhan.com, 2003
#ifndef INCLUDE_SEQAN_STREAM_IOSTREAM_BZIP2_IMPL_H_
#define INCLUDE_SEQAN_STREAM_IOSTREAM_BZIP2_IMPL_H_
#include "iostream_bzip2.h"
namespace bzip2_stream{
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>:: basic_bzip2_streambuf(
ostream_reference ostream_,
size_t block_size_100k_,
size_t verbosity_,
size_t work_factor_,
size_t buffer_size_
)
:
m_ostream(ostream_),
m_output_buffer(buffer_size_,0),
m_buffer(buffer_size_,0)
{
m_bzip2_stream.bzalloc=NULL;
m_bzip2_stream.bzfree=NULL;
m_bzip2_stream.next_in=NULL;
m_bzip2_stream.avail_in=0;
m_bzip2_stream.avail_out=0;
m_bzip2_stream.next_out=NULL;
m_err=BZ2_bzCompressInit(
&m_bzip2_stream,
std::min( 9, static_cast<int>(block_size_100k_) ),
std::min( 4, static_cast<int>(verbosity_) ),
std::min( 250, static_cast<int>(work_factor_) )
);
this->setp( &(m_buffer[0]), &(m_buffer[m_buffer.size()-1]));
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::~basic_bzip2_streambuf()
{
flush(BZ_FINISH);
m_ostream.flush();
m_err=BZ2_bzCompressEnd(&m_bzip2_stream);
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
int basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::sync ()
{
if ( this->pptr() && this->pptr() > this->pbase())
{
int c = overflow( EOF);
if ( c == EOF)
return -1;
}
return 0;
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
typename basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::int_type
basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::overflow (
typename basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::int_type c
)
{
int w = static_cast<int>(this->pptr() - this->pbase());
if (!Tr::eq_int_type(c, Tr::eof())) {
*this->pptr() = c;
++w;
}
if ( bzip2_to_stream( this->pbase(), w)) {
this->setp( this->pbase(), this->epptr());
return Tr::not_eof(c);
} else
return Tr::eof();
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
bool basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::bzip2_to_stream(
typename basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::char_type* buffer_,
std::streamsize buffer_size_
)
{
std::streamsize written_byte_size=0;
m_bzip2_stream.next_in=(byte_buffer_type)buffer_;
m_bzip2_stream.avail_in=buffer_size_*sizeof(char_type);
m_bzip2_stream.avail_out=static_cast<unsigned int>(m_output_buffer.size());
m_bzip2_stream.next_out=&(m_output_buffer[0]);
size_t remainder=0;
do
{
m_err = BZ2_bzCompress (&m_bzip2_stream, BZ_RUN );
if (m_err == BZ_RUN_OK || m_err == BZ_STREAM_END)
{
written_byte_size= static_cast<std::streamsize>(m_output_buffer.size()) - m_bzip2_stream.avail_out;
// ouput buffer is full, dumping to ostream
m_ostream.write(
(const char_type*) &(m_output_buffer[0]),
static_cast<std::streamsize>( written_byte_size/sizeof(char_type) )
);
// checking if some bytes were not written.
if ( (remainder = written_byte_size%sizeof(char_type))!=0)
{
// copy to the beginning of the stream
std::memmove(
&(m_output_buffer[0]),
&(m_output_buffer[written_byte_size-remainder]),
remainder);
}
m_bzip2_stream.avail_out=static_cast<unsigned int>(m_output_buffer.size()-remainder);
m_bzip2_stream.next_out=&m_output_buffer[remainder];
}
}
while (m_bzip2_stream.avail_in != 0 && m_err == BZ_RUN_OK);
return m_err == BZ_RUN_OK || m_err == BZ_FLUSH_OK;
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
std::streamsize basic_bzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::flush(int flush_mode)
{
std::streamsize written_byte_size=0, total_written_byte_size=0;
int const buffer_size = static_cast< int >( pptr() - pbase() ); // amount of data currently in buffer
m_bzip2_stream.next_in=(byte_buffer_type)pbase();
m_bzip2_stream.avail_in=static_cast< uInt >(buffer_size*sizeof(char_type));
m_bzip2_stream.avail_out=static_cast< uInt >(m_output_buffer.size());
m_bzip2_stream.next_out=&(m_output_buffer[0]);
size_t remainder=0;
do
{
m_err = BZ2_bzCompress (&m_bzip2_stream, flush_mode);
if (m_err == BZ_FINISH_OK || m_err == BZ_STREAM_END)
{
written_byte_size=
static_cast<std::streamsize>(m_output_buffer.size())
- m_bzip2_stream.avail_out;
total_written_byte_size+=written_byte_size;
// ouput buffer is full, dumping to ostream
m_ostream.write(
(const char_type*) &(m_output_buffer[0]),
static_cast<std::streamsize>( written_byte_size/sizeof(char_type)*sizeof(char) )
);
// checking if some bytes were not written.
if ( (remainder = written_byte_size%sizeof(char_type))!=0)
{
// copy to the beginning of the stream
std::memmove(
&(m_output_buffer[0]),
&(m_output_buffer[written_byte_size-remainder]),
remainder);
}
m_bzip2_stream.avail_out=static_cast<unsigned int>(m_output_buffer.size()-remainder);
m_bzip2_stream.next_out=&(m_output_buffer[remainder]);
}
} while (m_err == BZ_FINISH_OK);
m_ostream.flush();
return total_written_byte_size;
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::basic_unbzip2_streambuf(
istream_reference istream_,
size_t verbosity_,
bool small_,
size_t read_buffer_size_,
size_t input_buffer_size_
)
:
m_istream(istream_),
m_input_buffer(input_buffer_size_),
m_buffer(read_buffer_size_)
{
// setting zalloc, zfree and opaque
m_bzip2_stream.bzalloc=NULL;
m_bzip2_stream.bzfree=NULL;
m_bzip2_stream.next_in=NULL;
m_bzip2_stream.avail_in=0;
m_bzip2_stream.avail_out=0;
m_bzip2_stream.next_out=NULL;
m_err=BZ2_bzDecompressInit (
&m_bzip2_stream,
std::min(4, static_cast<int>(verbosity_)),
static_cast<int>(small_)
);
this->setg(
&(m_buffer[0])+4, // beginning of putback area
&(m_buffer[0])+4, // read position
&(m_buffer[0])+4); // end position
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
size_t basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::fill_input_buffer()
{
m_bzip2_stream.next_in=&(m_input_buffer[0]);
m_istream.read(
(char_type*)(&(m_input_buffer[0])),
static_cast<std::streamsize>(m_input_buffer.size()/sizeof(char_type))
);
return m_bzip2_stream.avail_in=m_istream.gcount()*sizeof(char_type);
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
void basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::put_back_from_bzip2_stream()
{
if (m_bzip2_stream.avail_in==0)
return;
m_istream.clear( std::ios::goodbit );
m_istream.seekg(
-static_cast<int>(m_bzip2_stream.avail_in),
std::ios_base::cur
);
m_bzip2_stream.avail_in=0;
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::~basic_unbzip2_streambuf()
{
BZ2_bzDecompressEnd(&m_bzip2_stream);
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
typename basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::int_type
basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::underflow()
{
if ( this->gptr() && ( this->gptr() < this->egptr()))
return * reinterpret_cast<unsigned char *>( this->gptr());
int n_putback = static_cast<int>(this->gptr() - this->eback());
if ( n_putback > 4)
n_putback = 4;
std::memmove(
&(m_buffer[0]) + (4 - n_putback),
this->gptr() - n_putback,
n_putback*sizeof(char_type)
);
int num = unbzip2_from_stream(
&(m_buffer[0])+4,
static_cast<std::streamsize>((m_buffer.size()-4)*sizeof(char_type))
);
if (num <= 0) // ERROR or EOF
return EOF;
// reset buffer pointers
this->setg(
&(m_buffer[0]) + (4 - n_putback), // beginning of putback area
&(m_buffer[0]) + 4, // read position
&(m_buffer[0]) + 4 + num); // end of buffer
// return next character
return* reinterpret_cast<unsigned char *>( this->gptr());
}
template<
typename Elem,
typename Tr,
typename ElemA,
typename ByteT,
typename ByteAT
>
std::streamsize basic_unbzip2_streambuf<
Elem,Tr,ElemA,ByteT,ByteAT
>::unbzip2_from_stream(
char_type* buffer_,
std::streamsize buffer_size_
)
{
m_bzip2_stream.next_out=(byte_buffer_type)buffer_;
m_bzip2_stream.avail_out=buffer_size_*sizeof(char_type);
size_t count =m_bzip2_stream.avail_in;
do
{
if (m_bzip2_stream.avail_in==0)
count=fill_input_buffer();
if (m_bzip2_stream.avail_in)
{
m_err = BZ2_bzDecompress( &m_bzip2_stream );
}
} while (m_err==BZ_OK && m_bzip2_stream.avail_out != 0 && count != 0);
if (m_err == BZ_STREAM_END)
put_back_from_bzip2_stream();
return buffer_size_ - m_bzip2_stream.avail_out/sizeof(char_type);
}
} // zlib_sream
#endif // INCLUDE_SEQAN_STREAM_IOSTREAM_BZIP2_IMPL_H_
|
