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432 lines
14 KiB
432 lines
14 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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// Note: custom allocators are not supported on VC6, since that compiler
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// had trouble finding the function zlib_base::do_init.
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#ifndef BOOST_IOSTREAMS_BZIP2_HPP_INCLUDED
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#define BOOST_IOSTREAMS_BZIP2_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <cassert>
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#include <memory> // allocator.
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#include <new> // bad_alloc.
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#include <boost/config.hpp> // MSVC, STATIC_CONSTANT, DEDUCED_TYPENAME, DINKUM.
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#include <boost/detail/workaround.hpp>
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#include <boost/iostreams/constants.hpp> // buffer size.
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#include <boost/iostreams/detail/config/auto_link.hpp>
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#include <boost/iostreams/detail/config/bzip2.hpp>
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#include <boost/iostreams/detail/config/dyn_link.hpp>
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#include <boost/iostreams/detail/config/wide_streams.hpp>
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#include <boost/iostreams/detail/ios.hpp> // failure, streamsize.
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#include <boost/iostreams/filter/symmetric.hpp>
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#include <boost/iostreams/pipeline.hpp>
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#include <boost/type_traits/is_same.hpp>
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// Must come last.
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable:4251 4231 4660)
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#endif
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#include <boost/config/abi_prefix.hpp>
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// Temporary fix.
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#undef small
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namespace boost { namespace iostreams {
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namespace bzip2 {
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// Typedefs.
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typedef void* (*alloc_func)(void*, int, int);
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typedef void (*free_func)(void*, void*);
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// Status codes
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BOOST_IOSTREAMS_DECL extern const int ok;
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BOOST_IOSTREAMS_DECL extern const int run_ok;
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BOOST_IOSTREAMS_DECL extern const int flush_ok;
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BOOST_IOSTREAMS_DECL extern const int finish_ok;
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BOOST_IOSTREAMS_DECL extern const int stream_end;
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BOOST_IOSTREAMS_DECL extern const int sequence_error;
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BOOST_IOSTREAMS_DECL extern const int param_error;
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BOOST_IOSTREAMS_DECL extern const int mem_error;
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BOOST_IOSTREAMS_DECL extern const int data_error;
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BOOST_IOSTREAMS_DECL extern const int data_error_magic;
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BOOST_IOSTREAMS_DECL extern const int io_error;
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BOOST_IOSTREAMS_DECL extern const int unexpected_eof;
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BOOST_IOSTREAMS_DECL extern const int outbuff_full;
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BOOST_IOSTREAMS_DECL extern const int config_error;
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// Action codes
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BOOST_IOSTREAMS_DECL extern const int finish;
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BOOST_IOSTREAMS_DECL extern const int run;
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// Default values
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const int default_block_size = 9;
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const int default_work_factor = 30;
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const bool default_small = false;
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} // End namespace bzip2.
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//
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// Class name: bzip2_params.
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// Description: Encapsulates the parameters passed to deflateInit2
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// to customize compression.
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//
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struct bzip2_params {
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// Non-explicit constructor for compression.
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bzip2_params( int block_size_ = bzip2::default_block_size,
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int work_factor_ = bzip2::default_work_factor )
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: block_size(block_size_), work_factor(work_factor_)
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{ }
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// Constructor for decompression.
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bzip2_params(bool small)
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: small(small), work_factor(0)
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{ }
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union {
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int block_size; // For compression.
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bool small; // For decompression.
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};
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int work_factor;
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};
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//
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// Class name: bzip2_error.
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// Description: Subclass of std::ios_base::failure thrown to indicate
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// bzip2 errors other than out-of-memory conditions.
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//
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class BOOST_IOSTREAMS_DECL bzip2_error : public BOOST_IOSTREAMS_FAILURE {
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public:
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explicit bzip2_error(int error);
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int error() const { return error_; }
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static void check BOOST_PREVENT_MACRO_SUBSTITUTION(int error);
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private:
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int error_;
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};
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namespace detail {
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template<typename Alloc>
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struct bzip2_allocator_traits {
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#ifndef BOOST_NO_STD_ALLOCATOR
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#if defined(BOOST_NO_CXX11_ALLOCATOR)
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typedef typename Alloc::template rebind<char>::other type;
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#else
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typedef typename std::allocator_traits<Alloc>::template rebind_alloc<char> type;
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#endif
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#else
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typedef std::allocator<char> type;
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#endif
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};
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template< typename Alloc,
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typename Base = // VC6 workaround (C2516)
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BOOST_DEDUCED_TYPENAME bzip2_allocator_traits<Alloc>::type >
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struct bzip2_allocator : private Base {
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private:
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#if defined(BOOST_NO_CXX11_ALLOCATOR) || defined(BOOST_NO_STD_ALLOCATOR)
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typedef typename Base::size_type size_type;
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#else
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typedef typename std::allocator_traits<Base>::size_type size_type;
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#endif
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public:
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BOOST_STATIC_CONSTANT(bool, custom =
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(!is_same<std::allocator<char>, Base>::value));
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typedef typename bzip2_allocator_traits<Alloc>::type allocator_type;
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static void* allocate(void* self, int items, int size);
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static void deallocate(void* self, void* address);
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};
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class BOOST_IOSTREAMS_DECL bzip2_base {
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public:
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typedef char char_type;
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protected:
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bzip2_base(const bzip2_params& params);
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~bzip2_base();
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bzip2_params& params() { return params_; }
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bool& ready() { return ready_; }
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template<typename Alloc>
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void init( bool compress,
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bzip2_allocator<Alloc>& alloc )
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{
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bool custom = bzip2_allocator<Alloc>::custom;
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do_init( compress,
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custom ? bzip2_allocator<Alloc>::allocate : 0,
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custom ? bzip2_allocator<Alloc>::deallocate : 0,
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custom ? &alloc : 0 );
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}
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void before( const char*& src_begin, const char* src_end,
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char*& dest_begin, char* dest_end );
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void after(const char*& src_begin, char*& dest_begin);
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int check_end(const char* src_begin, const char* dest_begin);
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int compress(int action);
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int decompress();
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int end(bool compress, std::nothrow_t);
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void end(bool compress);
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private:
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void do_init( bool compress,
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bzip2::alloc_func,
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bzip2::free_func,
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void* derived );
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bzip2_params params_;
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void* stream_; // Actual type: bz_stream*.
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bool ready_;
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};
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//
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// Template name: bzip2_compressor_impl
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// Description: Model of SymmetricFilter implementing compression by
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// delegating to the libbzip2 function BZ_bzCompress.
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//
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template<typename Alloc = std::allocator<char> >
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class bzip2_compressor_impl
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: public bzip2_base,
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#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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public
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#endif
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bzip2_allocator<Alloc>
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{
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public:
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bzip2_compressor_impl(const bzip2_params&);
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~bzip2_compressor_impl();
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bool filter( const char*& src_begin, const char* src_end,
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char*& dest_begin, char* dest_end, bool flush );
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void close();
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private:
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void init();
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bool eof_; // Guard to make sure filter() isn't called after it returns false.
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};
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//
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// Template name: bzip2_compressor
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// Description: Model of SymmetricFilter implementing decompression by
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// delegating to the libbzip2 function BZ_bzDecompress.
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//
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template<typename Alloc = std::allocator<char> >
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class bzip2_decompressor_impl
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: public bzip2_base,
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#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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public
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#endif
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bzip2_allocator<Alloc>
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{
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public:
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bzip2_decompressor_impl(bool small = bzip2::default_small);
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~bzip2_decompressor_impl();
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bool filter( const char*& begin_in, const char* end_in,
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char*& begin_out, char* end_out, bool flush );
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void close();
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private:
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void init();
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bool eof_; // Guard to make sure filter() isn't called after it returns false.
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};
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} // End namespace detail.
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//
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// Template name: bzip2_compressor
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// Description: Model of InputFilter and OutputFilter implementing
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// compression using libbzip2.
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//
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template<typename Alloc = std::allocator<char> >
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struct basic_bzip2_compressor
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: symmetric_filter<detail::bzip2_compressor_impl<Alloc>, Alloc>
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{
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private:
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typedef detail::bzip2_compressor_impl<Alloc> impl_type;
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typedef symmetric_filter<impl_type, Alloc> base_type;
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public:
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typedef typename base_type::char_type char_type;
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typedef typename base_type::category category;
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basic_bzip2_compressor( const bzip2_params& = bzip2::default_block_size,
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std::streamsize buffer_size = default_device_buffer_size );
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};
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BOOST_IOSTREAMS_PIPABLE(basic_bzip2_compressor, 1)
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typedef basic_bzip2_compressor<> bzip2_compressor;
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//
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// Template name: bzip2_decompressor
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// Description: Model of InputFilter and OutputFilter implementing
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// decompression using libbzip2.
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//
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template<typename Alloc = std::allocator<char> >
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struct basic_bzip2_decompressor
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: symmetric_filter<detail::bzip2_decompressor_impl<Alloc>, Alloc>
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{
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private:
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typedef detail::bzip2_decompressor_impl<Alloc> impl_type;
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typedef symmetric_filter<impl_type, Alloc> base_type;
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public:
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typedef typename base_type::char_type char_type;
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typedef typename base_type::category category;
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basic_bzip2_decompressor( bool small = bzip2::default_small,
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std::streamsize buffer_size = default_device_buffer_size );
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};
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BOOST_IOSTREAMS_PIPABLE(basic_bzip2_decompressor, 1)
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typedef basic_bzip2_decompressor<> bzip2_decompressor;
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//----------------------------------------------------------------------------//
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//------------------Implementation of bzip2_allocator-------------------------//
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namespace detail {
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template<typename Alloc, typename Base>
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void* bzip2_allocator<Alloc, Base>::allocate(void* self, int items, int size)
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{
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size_type len = items * size;
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char* ptr =
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static_cast<allocator_type*>(self)->allocate
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(len + sizeof(size_type)
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#if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, == 1)
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, (char*)0
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#endif
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);
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*reinterpret_cast<size_type*>(ptr) = len;
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return ptr + sizeof(size_type);
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}
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template<typename Alloc, typename Base>
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void bzip2_allocator<Alloc, Base>::deallocate(void* self, void* address)
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{
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char* ptr = reinterpret_cast<char*>(address) - sizeof(size_type);
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size_type len = *reinterpret_cast<size_type*>(ptr) + sizeof(size_type);
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static_cast<allocator_type*>(self)->deallocate(ptr, len);
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}
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//------------------Implementation of bzip2_compressor_impl-------------------//
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template<typename Alloc>
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bzip2_compressor_impl<Alloc>::bzip2_compressor_impl(const bzip2_params& p)
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: bzip2_base(p), eof_(false) { }
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template<typename Alloc>
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bzip2_compressor_impl<Alloc>::~bzip2_compressor_impl()
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{ (void) bzip2_base::end(true, std::nothrow); }
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template<typename Alloc>
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bool bzip2_compressor_impl<Alloc>::filter
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( const char*& src_begin, const char* src_end,
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char*& dest_begin, char* dest_end, bool flush )
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{
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if (!ready()) init();
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if (eof_) return false;
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before(src_begin, src_end, dest_begin, dest_end);
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int result = compress(flush ? bzip2::finish : bzip2::run);
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after(src_begin, dest_begin);
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bzip2_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result);
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return !(eof_ = result == bzip2::stream_end);
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}
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template<typename Alloc>
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void bzip2_compressor_impl<Alloc>::close()
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{
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try {
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end(true);
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} catch (...) {
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eof_ = false;
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throw;
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}
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eof_ = false;
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}
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template<typename Alloc>
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inline void bzip2_compressor_impl<Alloc>::init()
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{ bzip2_base::init(true, static_cast<bzip2_allocator<Alloc>&>(*this)); }
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//------------------Implementation of bzip2_decompressor_impl-----------------//
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template<typename Alloc>
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bzip2_decompressor_impl<Alloc>::bzip2_decompressor_impl(bool small)
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: bzip2_base(bzip2_params(small)), eof_(false) { }
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template<typename Alloc>
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bzip2_decompressor_impl<Alloc>::~bzip2_decompressor_impl()
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{ (void) bzip2_base::end(false, std::nothrow); }
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template<typename Alloc>
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bool bzip2_decompressor_impl<Alloc>::filter
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( const char*& src_begin, const char* src_end,
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char*& dest_begin, char* dest_end, bool flush )
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{
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do {
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if (eof_) {
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// reset the stream if there are more characters
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if(src_begin == src_end)
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return false;
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else
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close();
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}
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if (!ready())
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init();
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before(src_begin, src_end, dest_begin, dest_end);
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int result = decompress();
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if(result == bzip2::ok && flush)
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result = check_end(src_begin, dest_begin);
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after(src_begin, dest_begin);
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bzip2_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result);
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eof_ = result == bzip2::stream_end;
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} while (eof_ && src_begin != src_end && dest_begin != dest_end);
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return true;
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}
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template<typename Alloc>
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void bzip2_decompressor_impl<Alloc>::close()
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{
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try {
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end(false);
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} catch (...) {
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eof_ = false;
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throw;
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}
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eof_ = false;
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}
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template<typename Alloc>
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inline void bzip2_decompressor_impl<Alloc>::init()
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{ bzip2_base::init(false, static_cast<bzip2_allocator<Alloc>&>(*this)); }
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} // End namespace detail.
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//------------------Implementation of bzip2_decompressor----------------------//
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template<typename Alloc>
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basic_bzip2_compressor<Alloc>::basic_bzip2_compressor
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(const bzip2_params& p, std::streamsize buffer_size)
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: base_type(buffer_size, p)
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{ }
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//------------------Implementation of bzip2_decompressor----------------------//
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template<typename Alloc>
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basic_bzip2_decompressor<Alloc>::basic_bzip2_decompressor
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(bool small, std::streamsize buffer_size)
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: base_type(buffer_size, small)
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{ }
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//----------------------------------------------------------------------------//
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} } // End namespaces iostreams, boost.
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#include <boost/config/abi_suffix.hpp> // Pops abi_suffix.hpp pragmas.
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#ifdef BOOST_MSVC
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# pragma warning(pop)
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#endif
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#endif // #ifndef BOOST_IOSTREAMS_BZIP2_HPP_INCLUDED
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