diff options
Diffstat (limited to 'src/third_party/boost-1.70.0/boost/iostreams/filter/zlib.hpp')
| -rw-r--r-- | src/third_party/boost-1.70.0/boost/iostreams/filter/zlib.hpp | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/src/third_party/boost-1.70.0/boost/iostreams/filter/zlib.hpp b/src/third_party/boost-1.70.0/boost/iostreams/filter/zlib.hpp new file mode 100644 index 00000000000..e57870a510f --- /dev/null +++ b/src/third_party/boost-1.70.0/boost/iostreams/filter/zlib.hpp @@ -0,0 +1,431 @@ +// (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_ZLIB_HPP_INCLUDED +#define BOOST_IOSTREAMS_ZLIB_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/cstdint.hpp> // uint*_t +#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/config/zlib.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 4275 4231 4660) // Dependencies not exported. +#endif +#include <boost/config/abi_prefix.hpp> + +namespace boost { namespace iostreams { + +namespace zlib { + // Typedefs + +typedef uint32_t uint; +typedef uint8_t byte; +typedef uint32_t ulong; + +// Prefix 'x' prevents symbols from being redefined when Z_PREFIX is defined +typedef void* (*xalloc_func)(void*, zlib::uint, zlib::uint); +typedef void (*xfree_func)(void*, void*); + + // Compression levels + +BOOST_IOSTREAMS_DECL extern const int no_compression; +BOOST_IOSTREAMS_DECL extern const int best_speed; +BOOST_IOSTREAMS_DECL extern const int best_compression; +BOOST_IOSTREAMS_DECL extern const int default_compression; + + // Compression methods + +BOOST_IOSTREAMS_DECL extern const int deflated; + + // Compression strategies + +BOOST_IOSTREAMS_DECL extern const int default_strategy; +BOOST_IOSTREAMS_DECL extern const int filtered; +BOOST_IOSTREAMS_DECL extern const int huffman_only; + + // Status codes + +BOOST_IOSTREAMS_DECL extern const int okay; +BOOST_IOSTREAMS_DECL extern const int stream_end; +BOOST_IOSTREAMS_DECL extern const int stream_error; +BOOST_IOSTREAMS_DECL extern const int version_error; +BOOST_IOSTREAMS_DECL extern const int data_error; +BOOST_IOSTREAMS_DECL extern const int mem_error; +BOOST_IOSTREAMS_DECL extern const int buf_error; + + // Flush codes + +BOOST_IOSTREAMS_DECL extern const int finish; +BOOST_IOSTREAMS_DECL extern const int no_flush; +BOOST_IOSTREAMS_DECL extern const int sync_flush; + + // Code for current OS + +//BOOST_IOSTREAMS_DECL extern const int os_code; + + // Null pointer constant. + +const int null = 0; + + // Default values + +const int default_window_bits = 15; +const int default_mem_level = 8; +const bool default_crc = false; +const bool default_noheader = false; + +} // End namespace zlib. + +// +// Class name: zlib_params. +// Description: Encapsulates the parameters passed to deflateInit2 +// and inflateInit2 to customize compression and decompression. +// +struct zlib_params { + + // Non-explicit constructor. + zlib_params( int level_ = zlib::default_compression, + int method_ = zlib::deflated, + int window_bits_ = zlib::default_window_bits, + int mem_level_ = zlib::default_mem_level, + int strategy_ = zlib::default_strategy, + bool noheader_ = zlib::default_noheader, + bool calculate_crc_ = zlib::default_crc ) + : level(level_), method(method_), window_bits(window_bits_), + mem_level(mem_level_), strategy(strategy_), + noheader(noheader_), calculate_crc(calculate_crc_) + { } + int level; + int method; + int window_bits; + int mem_level; + int strategy; + bool noheader; + bool calculate_crc; +}; + +// +// Class name: zlib_error. +// Description: Subclass of std::ios::failure thrown to indicate +// zlib errors other than out-of-memory conditions. +// +class BOOST_IOSTREAMS_DECL zlib_error : public BOOST_IOSTREAMS_FAILURE { +public: + explicit zlib_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 zlib_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 zlib_allocator_traits<Alloc>::type > +struct zlib_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 zlib_allocator_traits<Alloc>::type allocator_type; + static void* allocate(void* self, zlib::uint items, zlib::uint size); + static void deallocate(void* self, void* address); +}; + +class BOOST_IOSTREAMS_DECL zlib_base { +public: + typedef char char_type; +protected: + zlib_base(); + ~zlib_base(); + void* stream() { return stream_; } + template<typename Alloc> + void init( const zlib_params& p, + bool compress, + zlib_allocator<Alloc>& zalloc ) + { + bool custom = zlib_allocator<Alloc>::custom; + do_init( p, compress, + custom ? zlib_allocator<Alloc>::allocate : 0, + custom ? zlib_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 xdeflate(int flush); // Prefix 'x' prevents symbols from being + int xinflate(int flush); // redefined when Z_PREFIX is defined + void reset(bool compress, bool realloc); +public: + zlib::ulong crc() const { return crc_; } + int total_in() const { return total_in_; } + int total_out() const { return total_out_; } +private: + void do_init( const zlib_params& p, bool compress, + zlib::xalloc_func, + zlib::xfree_func, + void* derived ); + void* stream_; // Actual type: z_stream*. + bool calculate_crc_; + zlib::ulong crc_; + zlib::ulong crc_imp_; + int total_in_; + int total_out_; +}; + +// +// Template name: zlib_compressor_impl +// Description: Model of C-Style Filte implementing compression by +// delegating to the zlib function deflate. +// +template<typename Alloc = std::allocator<char> > +class zlib_compressor_impl : public zlib_base, public zlib_allocator<Alloc> { +public: + zlib_compressor_impl(const zlib_params& = zlib::default_compression); + ~zlib_compressor_impl(); + bool filter( const char*& src_begin, const char* src_end, + char*& dest_begin, char* dest_end, bool flush ); + void close(); +}; + +// +// Template name: zlib_compressor +// Description: Model of C-Style Filte implementing decompression by +// delegating to the zlib function inflate. +// +template<typename Alloc = std::allocator<char> > +class zlib_decompressor_impl : public zlib_base, public zlib_allocator<Alloc> { +public: + zlib_decompressor_impl(const zlib_params&); + zlib_decompressor_impl(int window_bits = zlib::default_window_bits); + ~zlib_decompressor_impl(); + bool filter( const char*& begin_in, const char* end_in, + char*& begin_out, char* end_out, bool flush ); + void close(); + bool eof() const { return eof_; } +private: + bool eof_; +}; + +} // End namespace detail. + +// +// Template name: zlib_compressor +// Description: Model of InputFilter and OutputFilter implementing +// compression using zlib. +// +template<typename Alloc = std::allocator<char> > +struct basic_zlib_compressor + : symmetric_filter<detail::zlib_compressor_impl<Alloc>, Alloc> +{ +private: + typedef detail::zlib_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_zlib_compressor( const zlib_params& = zlib::default_compression, + std::streamsize buffer_size = default_device_buffer_size ); + zlib::ulong crc() { return this->filter().crc(); } + int total_in() { return this->filter().total_in(); } +}; +BOOST_IOSTREAMS_PIPABLE(basic_zlib_compressor, 1) + +typedef basic_zlib_compressor<> zlib_compressor; + +// +// Template name: zlib_decompressor +// Description: Model of InputFilter and OutputFilter implementing +// decompression using zlib. +// +template<typename Alloc = std::allocator<char> > +struct basic_zlib_decompressor + : symmetric_filter<detail::zlib_decompressor_impl<Alloc>, Alloc> +{ +private: + typedef detail::zlib_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_zlib_decompressor( int window_bits = zlib::default_window_bits, + std::streamsize buffer_size = default_device_buffer_size ); + basic_zlib_decompressor( const zlib_params& p, + std::streamsize buffer_size = default_device_buffer_size ); + zlib::ulong crc() { return this->filter().crc(); } + int total_out() { return this->filter().total_out(); } + bool eof() { return this->filter().eof(); } +}; +BOOST_IOSTREAMS_PIPABLE(basic_zlib_decompressor, 1) + +typedef basic_zlib_decompressor<> zlib_decompressor; + +//----------------------------------------------------------------------------// + +//------------------Implementation of zlib_allocator--------------------------// + +namespace detail { + +template<typename Alloc, typename Base> +void* zlib_allocator<Alloc, Base>::allocate + (void* self, zlib::uint items, zlib::uint 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 zlib_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 zlib_compressor_impl--------------------// + +template<typename Alloc> +zlib_compressor_impl<Alloc>::zlib_compressor_impl(const zlib_params& p) +{ init(p, true, static_cast<zlib_allocator<Alloc>&>(*this)); } + +template<typename Alloc> +zlib_compressor_impl<Alloc>::~zlib_compressor_impl() +{ reset(true, false); } + +template<typename Alloc> +bool zlib_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 = xdeflate(flush ? zlib::finish : zlib::no_flush); + after(src_begin, dest_begin, true); + zlib_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result); + return result != zlib::stream_end; +} + +template<typename Alloc> +void zlib_compressor_impl<Alloc>::close() { reset(true, true); } + +//------------------Implementation of zlib_decompressor_impl------------------// + +template<typename Alloc> +zlib_decompressor_impl<Alloc>::zlib_decompressor_impl(const zlib_params& p) + : eof_(false) +{ init(p, false, static_cast<zlib_allocator<Alloc>&>(*this)); } + +template<typename Alloc> +zlib_decompressor_impl<Alloc>::~zlib_decompressor_impl() +{ reset(false, false); } + +template<typename Alloc> +zlib_decompressor_impl<Alloc>::zlib_decompressor_impl(int window_bits) +{ + zlib_params p; + p.window_bits = window_bits; + init(p, false, static_cast<zlib_allocator<Alloc>&>(*this)); +} + +template<typename Alloc> +bool zlib_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 = xinflate(zlib::sync_flush); + after(src_begin, dest_begin, false); + zlib_error::check BOOST_PREVENT_MACRO_SUBSTITUTION(result); + return !(eof_ = result == zlib::stream_end); +} + +template<typename Alloc> +void zlib_decompressor_impl<Alloc>::close() { + eof_ = false; + reset(false, true); +} + +} // End namespace detail. + +//------------------Implementation of zlib_decompressor-----------------------// + +template<typename Alloc> +basic_zlib_compressor<Alloc>::basic_zlib_compressor + (const zlib_params& p, std::streamsize buffer_size) + : base_type(buffer_size, p) { } + +//------------------Implementation of zlib_decompressor-----------------------// + +template<typename Alloc> +basic_zlib_decompressor<Alloc>::basic_zlib_decompressor + (int window_bits, std::streamsize buffer_size) + : base_type(buffer_size, window_bits) { } + +template<typename Alloc> +basic_zlib_decompressor<Alloc>::basic_zlib_decompressor + (const zlib_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_ZLIB_HPP_INCLUDED |