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// Copyright Takeshi Mouri 2006, 2007.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://hamigaki.sourceforge.jp/libs/iostreams for library home page.
#ifndef HAMIGAKI_IOSTREAMS_ARBITRARY_POSITIONAL_FACADE_HPP
#define HAMIGAKI_IOSTREAMS_ARBITRARY_POSITIONAL_FACADE_HPP
#include <boost/config.hpp>
#include <boost/iostreams/detail/ios.hpp>
#include <boost/iostreams/positioning.hpp>
#include <boost/iostreams/traits.hpp>
#include <boost/assert.hpp>
namespace boost { namespace iostreams {
template<class Derived, class CharT, std::streamsize MaxBlockSize>
class arbitrary_positional_facade;
class core_access
{
#if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
public:
#else
template<class Derived, class CharT, std::streamsize MaxBlockSize>
friend class arbitrary_positional_facade;
friend struct device_operations;
template<class Device>
friend struct filter_operations;
#endif
template<class RepositionalSource, class CharT>
static std::streamsize read_blocks(
RepositionalSource& src, CharT* s, std::streamsize n)
{
return src.read_blocks(s, n);
}
template<class RepositionalInputFilter, class Source>
static std::streamsize read_blocks(
RepositionalInputFilter& filter, Source& src,
typename boost::iostreams::char_type_of<Source>::type* s,
std::streamsize n)
{
return filter.read_blocks(src, s, n);
}
template<class RepositionalSink, class CharT>
static std::streamsize write_blocks(
RepositionalSink& sink, const CharT* s, std::streamsize n)
{
return sink.write_blocks(s, n);
}
template<class RepositionalOutputFilter, class Sink>
static std::streamsize write_blocks(
RepositionalOutputFilter& filter, Sink& sink,
const typename boost::iostreams::char_type_of<Sink>::type* s,
std::streamsize n)
{
return filter.write_blocks(sink, s, n);
}
template<class RepositionalSink, class CharT>
static void close_with_flush(
RepositionalSink& sink, const CharT* s, std::streamsize n)
{
return sink.close_with_flush(s, n);
}
template<class RepositionalOutputFilter, class Sink>
static void close_with_flush(
RepositionalOutputFilter& filter, Sink& sink,
const typename boost::iostreams::char_type_of<Sink>::type* s,
std::streamsize n)
{
return filter.close_with_flush(sink, s, n);
}
template<class RepositionalDevice>
static std::streampos seek_blocks(
RepositionalDevice& dev,
boost::iostreams::stream_offset off, BOOST_IOS::seekdir way)
{
return dev.seek_blocks(off, way);
}
struct device_operations
{
template<class RepositionalDevice, class CharT>
std::streamsize read_blocks(
RepositionalDevice& t, CharT* s, std::streamsize n) const
{
return core_access::read_blocks(t, s, n);
}
template<class RepositionalDevice, class CharT>
std::streamsize write_blocks(
RepositionalDevice& t, const CharT* s, std::streamsize n) const
{
return core_access::write_blocks(t, s, n);
}
};
template<class Device>
struct filter_operations
{
typedef typename boost::iostreams::
char_type_of<Device>::type char_type;
Device* dev_ptr_;
explicit filter_operations(Device& dev) : dev_ptr_(&dev) {}
template<class RepositionalInputFilter>
std::streamsize read_blocks(
RepositionalInputFilter& t, char_type* s, std::streamsize n) const
{
return core_access::read_blocks(t, *dev_ptr_, s, n);
}
template<class RepositionalOutputFilter>
std::streamsize write_blocks(
RepositionalOutputFilter& t,
const char_type* s, std::streamsize n) const
{
return core_access::write_blocks(t, *dev_ptr_, s, n);
}
};
};
template<class Derived, class CharT, std::streamsize MaxBlockSize>
class arbitrary_positional_facade
{
private:
typedef CharT char_type;
Derived& derived()
{
return *static_cast<Derived*>(this);
}
protected:
typedef arbitrary_positional_facade<
Derived,CharT,MaxBlockSize> arbitrary_positional_facade_;
void block_size(std::streamsize n)
{
block_size_ = n;
}
public:
arbitrary_positional_facade() : block_size_(MaxBlockSize), count_(0)
{
}
explicit arbitrary_positional_facade(std::streamsize block_size)
: block_size_(block_size), count_(0)
{
BOOST_ASSERT(block_size_ <= MaxBlockSize);
}
std::streamsize read(char_type* s, std::streamsize n)
{
return read_impl(core_access::device_operations(), s, n);
}
template<class Source>
std::streamsize read(Source& src, char_type* s, std::streamsize n)
{
return read_impl(core_access::filter_operations<Source>(src), s, n);
}
std::streamsize write(const char_type* s, std::streamsize n)
{
return write_impl(core_access::device_operations(), s, n);
}
template<class Sink>
std::streamsize write(Sink& sink, const char_type* s, std::streamsize n)
{
return write_impl(core_access::filter_operations<Sink>(sink), s, n);
}
void close()
{
BOOST_ASSERT(count_ < block_size_);
core_access::close_with_flush(derived(), buffer_, count_);
}
template<class Sink>
void close(Sink& sink)
{
BOOST_ASSERT(count_ < block_size_);
core_access::close_with_flush(derived(), sink, buffer_, count_);
}
std::streampos seek(
boost::iostreams::stream_offset off, BOOST_IOS::seekdir way)
{
if (way == BOOST_IOS::beg)
{
core_access::seek_blocks(derived(), off/block_size_, way);
std::streamsize skip =
static_cast<std::streamsize>(off%block_size_);
if (skip == 0)
count_ = 0;
else
{
std::streamsize res =
core_access::read_blocks(derived(), buffer_, 1);
if (res != 1)
throw BOOST_IOSTREAMS_FAILURE("bad seek");
count_ = block_size_ - skip;
}
return boost::iostreams::offset_to_position(off);
}
else if (way == BOOST_IOS::cur)
{
std::streampos pos =
core_access::seek_blocks(
derived(), (off-count_)/block_size_, way);
std::streamsize skip =
static_cast<std::streamsize>((off-count_)%block_size_);
if (skip == 0)
{
count_ = 0;
return boost::iostreams::offset_to_position(
boost::iostreams::position_to_offset(pos) * block_size_);
}
else
{
std::streamsize res =
core_access::read_blocks(derived(), buffer_, 1);
if (res != 1)
throw BOOST_IOSTREAMS_FAILURE("bad seek");
count_ = block_size_ - skip;
return boost::iostreams::offset_to_position(
boost::iostreams::position_to_offset(pos) * block_size_
+ block_size_-count_);
}
}
else
{
std::streampos pos =
core_access::seek_blocks(
derived(), (off-block_size_+1)/block_size_, way);
count_ =
static_cast<std::streamsize>((-off)%block_size_);
if (count_ == 0)
{
return boost::iostreams::offset_to_position(
boost::iostreams::position_to_offset(pos) * block_size_);
}
else
{
std::streamsize res =
core_access::read_blocks(derived(), buffer_, 1);
if (res != 1)
throw BOOST_IOSTREAMS_FAILURE("bad seek");
return boost::iostreams::offset_to_position(
boost::iostreams::position_to_offset(pos) * block_size_
+ block_size_-count_);
}
}
}
private:
char_type buffer_[MaxBlockSize];
std::streamsize block_size_;
std::streamsize count_;
template<class Op>
std::streamsize read_impl(const Op& op, char_type* s, std::streamsize n)
{
std::streamsize total = 0;
if (count_ != 0)
{
std::streamsize amt = (std::min)(n, count_);
char_type* start = buffer_ + (block_size_ - count_);
s = std::copy(start, start+amt, s);
n -= amt;
count_ -= amt;
total += amt;
}
if (n >= block_size_)
{
BOOST_ASSERT(count_ == 0);
std::streamsize request = n/block_size_;
std::streamsize res =
op.read_blocks(derived(), s, request);
if (res != -1)
{
s += res;
n -= res;
total += res;
}
if (res < request*block_size_)
return total != 0 ? total : -1;
}
if (n != 0)
{
BOOST_ASSERT(n < block_size_);
BOOST_ASSERT(count_ == 0);
std::streamsize res =
op.read_blocks(derived(), buffer_, 1);
if (res > 0)
{
s = std::copy(buffer_, buffer_+n, s);
count_ = block_size_ - n;
total += n;
}
}
return total != 0 ? total : -1;
}
template<class Op>
std::streamsize write_impl(
const Op& op, const char_type* s, std::streamsize n)
{
std::streamsize total = 0;
if (count_ != 0)
{
std::streamsize amt = (std::min)(n, block_size_-count_);
std::copy(s, s+amt, buffer_+count_);
s += amt;
n -= amt;
count_ += amt;
total += amt;
if (count_ == block_size_)
{
op.write_blocks(derived(), buffer_, 1);
count_ = 0;
}
}
if (n >= block_size_)
{
BOOST_ASSERT(count_ == 0);
std::streamsize request = n/block_size_;
op.write_blocks(derived(), s, request);
std::streamsize amt = request*block_size_;
s += amt;
n -= amt;
total += amt;
}
if (n != 0)
{
BOOST_ASSERT(n < block_size_);
BOOST_ASSERT(count_ == 0);
std::copy(s, s+n, buffer_);
count_ = n;
total += n;
}
return total != 0 ? total : -1;
}
};
} } // End namespaces iostreams, boost.
#endif // HAMIGAKI_IOSTREAMS_ARBITRARY_POSITIONAL_FACADE_HPP
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