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