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- // (C) Copyright Milan Svoboda 2008.
- // Originally developed under the fusecompress project.
- // 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 lzma_base::do_init.
- #ifndef BOOST_IOSTREAMS_LZMA_HPP_INCLUDED
- #define BOOST_IOSTREAMS_LZMA_HPP_INCLUDED
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <cassert>
- #include <iosfwd> // streamsize.
- #include <memory> // allocator, bad_alloc.
- #include <new>
- #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/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) // Dependencies not exported.
- #endif
- #include <boost/config/abi_prefix.hpp>
- namespace boost { namespace iostreams {
- namespace lzma {
- typedef void* (*alloc_func)(void*, size_t, size_t);
- typedef void (*free_func)(void*, void*);
- // Compression levels
- BOOST_IOSTREAMS_DECL extern const uint32_t no_compression;
- BOOST_IOSTREAMS_DECL extern const uint32_t best_speed;
- BOOST_IOSTREAMS_DECL extern const uint32_t best_compression;
- BOOST_IOSTREAMS_DECL extern const uint32_t default_compression;
- // Status codes
- BOOST_IOSTREAMS_DECL extern const int okay;
- BOOST_IOSTREAMS_DECL extern const int stream_end;
- BOOST_IOSTREAMS_DECL extern const int unsupported_check;
- BOOST_IOSTREAMS_DECL extern const int mem_error;
- BOOST_IOSTREAMS_DECL extern const int options_error;
- BOOST_IOSTREAMS_DECL extern const int data_error;
- BOOST_IOSTREAMS_DECL extern const int buf_error;
- BOOST_IOSTREAMS_DECL extern const int prog_error;
- // Flush codes
- BOOST_IOSTREAMS_DECL extern const int finish;
- BOOST_IOSTREAMS_DECL extern const int full_flush;
- BOOST_IOSTREAMS_DECL extern const int sync_flush;
- BOOST_IOSTREAMS_DECL extern const int run;
- // Code for current OS
- // Null pointer constant.
- const int null = 0;
- // Default values
- } // End namespace lzma.
- //
- // Class name: lzma_params.
- // Description: Encapsulates the parameters passed to lzmadec_init
- // to customize compression and decompression.
- //
- struct lzma_params {
- // Non-explicit constructor.
- lzma_params( uint32_t level = lzma::default_compression, uint32_t threads = 1 )
- : level(level)
- , threads(threads)
- { }
- uint32_t level;
- uint32_t threads;
- };
- //
- // Class name: lzma_error.
- // Description: Subclass of std::ios::failure thrown to indicate
- // lzma errors other than out-of-memory conditions.
- //
- class BOOST_IOSTREAMS_DECL lzma_error : public BOOST_IOSTREAMS_FAILURE {
- public:
- explicit lzma_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 lzma_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 lzma_allocator_traits<Alloc>::type >
- struct lzma_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 lzma_allocator_traits<Alloc>::type allocator_type;
- static void* allocate(void* self, size_t items, size_t size);
- static void deallocate(void* self, void* address);
- };
- class BOOST_IOSTREAMS_DECL lzma_base {
- public:
- typedef char char_type;
- protected:
- lzma_base();
- ~lzma_base();
- void* stream() { return stream_; }
- template<typename Alloc>
- void init( const lzma_params& p,
- bool compress,
- lzma_allocator<Alloc>& zalloc )
- {
- bool custom = lzma_allocator<Alloc>::custom;
- do_init( p, compress,
- custom ? lzma_allocator<Alloc>::allocate : 0,
- custom ? lzma_allocator<Alloc>::deallocate : 0,
- &zalloc );
- }
- 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,
- bool compress );
- int deflate(int action);
- int inflate(int action);
- void reset(bool compress, bool realloc);
- private:
- void do_init( const lzma_params& p, bool compress,
- lzma::alloc_func,
- lzma::free_func,
- void* derived );
- void init_stream(bool compress);
- void* stream_; // Actual type: lzma_stream*.
- uint32_t level_;
- uint32_t threads_;
- };
- //
- // Template name: lzma_compressor_impl
- // Description: Model of C-Style Filter implementing compression by
- // delegating to the lzma function deflate.
- //
- template<typename Alloc = std::allocator<char> >
- class lzma_compressor_impl : public lzma_base, public lzma_allocator<Alloc> {
- public:
- lzma_compressor_impl(const lzma_params& = lzma_params());
- ~lzma_compressor_impl();
- bool filter( const char*& src_begin, const char* src_end,
- char*& dest_begin, char* dest_end, bool flush );
- void close();
- };
- //
- // Template name: lzma_compressor_impl
- // Description: Model of C-Style Filte implementing decompression by
- // delegating to the lzma function inflate.
- //
- template<typename Alloc = std::allocator<char> >
- class lzma_decompressor_impl : public lzma_base, public lzma_allocator<Alloc> {
- public:
- lzma_decompressor_impl(const lzma_params&);
- lzma_decompressor_impl();
- ~lzma_decompressor_impl();
- bool filter( const char*& begin_in, const char* end_in,
- char*& begin_out, char* end_out, bool flush );
- void close();
- };
- } // End namespace detail.
- //
- // Template name: lzma_compressor
- // Description: Model of InputFilter and OutputFilter implementing
- // compression using lzma.
- //
- template<typename Alloc = std::allocator<char> >
- struct basic_lzma_compressor
- : symmetric_filter<detail::lzma_compressor_impl<Alloc>, Alloc>
- {
- private:
- typedef detail::lzma_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_lzma_compressor( const lzma_params& = lzma_params(),
- std::streamsize buffer_size = default_device_buffer_size );
- };
- BOOST_IOSTREAMS_PIPABLE(basic_lzma_compressor, 1)
- typedef basic_lzma_compressor<> lzma_compressor;
- //
- // Template name: lzma_decompressor
- // Description: Model of InputFilter and OutputFilter implementing
- // decompression using lzma.
- //
- template<typename Alloc = std::allocator<char> >
- struct basic_lzma_decompressor
- : symmetric_filter<detail::lzma_decompressor_impl<Alloc>, Alloc>
- {
- private:
- typedef detail::lzma_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_lzma_decompressor( std::streamsize buffer_size = default_device_buffer_size );
- basic_lzma_decompressor( const lzma_params& p,
- std::streamsize buffer_size = default_device_buffer_size );
- };
- BOOST_IOSTREAMS_PIPABLE(basic_lzma_decompressor, 1)
- typedef basic_lzma_decompressor<> lzma_decompressor;
- //----------------------------------------------------------------------------//
- //------------------Implementation of lzma_allocator--------------------------//
- namespace detail {
- template<typename Alloc, typename Base>
- void* lzma_allocator<Alloc, Base>::allocate
- (void* self, size_t items, size_t 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 lzma_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 lzma_compressor_impl--------------------//
- template<typename Alloc>
- lzma_compressor_impl<Alloc>::lzma_compressor_impl(const lzma_params& p)
- { init(p, true, static_cast<lzma_allocator<Alloc>&>(*this)); }
- template<typename Alloc>
- lzma_compressor_impl<Alloc>::~lzma_compressor_impl()
- { reset(true, false); }
- template<typename Alloc>
- bool lzma_compressor_impl<Alloc>::filter
- ( const char*& src_begin, const char* src_end,
- char*& dest_begin, char* dest_end, bool flush )
- {
- before(src_begin, src_end, dest_begin, dest_end);
- int result = deflate(flush ? lzma::finish : lzma::run);
- after(src_begin, dest_begin, true);
- lzma_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result);
- return result != lzma::stream_end;
- }
- template<typename Alloc>
- void lzma_compressor_impl<Alloc>::close() { reset(true, true); }
- //------------------Implementation of lzma_decompressor_impl------------------//
- template<typename Alloc>
- lzma_decompressor_impl<Alloc>::lzma_decompressor_impl(const lzma_params& p)
- { init(p, false, static_cast<lzma_allocator<Alloc>&>(*this)); }
- template<typename Alloc>
- lzma_decompressor_impl<Alloc>::~lzma_decompressor_impl()
- { reset(false, false); }
- template<typename Alloc>
- lzma_decompressor_impl<Alloc>::lzma_decompressor_impl()
- {
- lzma_params p;
- init(p, false, static_cast<lzma_allocator<Alloc>&>(*this));
- }
- template<typename Alloc>
- bool lzma_decompressor_impl<Alloc>::filter
- ( const char*& src_begin, const char* src_end,
- char*& dest_begin, char* dest_end, bool flush )
- {
- before(src_begin, src_end, dest_begin, dest_end);
- int result = inflate(flush ? lzma::finish : lzma::run);
- after(src_begin, dest_begin, false);
- lzma_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result);
- return result != lzma::stream_end;
- }
- template<typename Alloc>
- void lzma_decompressor_impl<Alloc>::close() { reset(false, true); }
- } // End namespace detail.
- //------------------Implementation of lzma_compressor-----------------------//
- template<typename Alloc>
- basic_lzma_compressor<Alloc>::basic_lzma_compressor
- (const lzma_params& p, std::streamsize buffer_size)
- : base_type(buffer_size, p) { }
- //------------------Implementation of lzma_decompressor-----------------------//
- template<typename Alloc>
- basic_lzma_decompressor<Alloc>::basic_lzma_decompressor
- (std::streamsize buffer_size)
- : base_type(buffer_size) { }
- template<typename Alloc>
- basic_lzma_decompressor<Alloc>::basic_lzma_decompressor
- (const lzma_params& p, std::streamsize buffer_size)
- : base_type(buffer_size, p) { }
- //----------------------------------------------------------------------------//
- } } // 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_LZMA_HPP_INCLUDED
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