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