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// (C) Copyright Jonathan Turkanis 2003.
// 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.
// To configure Boost to work with zlib, see the
// installation instructions here:
// http://boost.org/libs/iostreams/doc/index.html?path=7
// Define BOOST_IOSTREAMS_SOURCE so that <boost/iostreams/detail/config.hpp>
// knows that we are building the library (possibly exporting code), rather
// than using it (possibly importing code).
#define BOOST_IOSTREAMS_SOURCE
#include <boost/iostreams/detail/config/dyn_link.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include "zlib.h" // Jean-loup Gailly's and Mark Adler's "zlib.h" header.
// To configure Boost to work with zlib, see the
// installation instructions here:
// http://boost.org/libs/iostreams/doc/index.html?path=7
namespace boost { namespace iostreams {
namespace zlib {
// Compression levels
const int no_compression = Z_NO_COMPRESSION;
const int best_speed = Z_BEST_SPEED;
const int best_compression = Z_BEST_COMPRESSION;
const int default_compression = Z_DEFAULT_COMPRESSION;
// Compression methods
const int deflated = Z_DEFLATED;
// Compression strategies
const int default_strategy = Z_DEFAULT_STRATEGY;
const int filtered = Z_FILTERED;
const int huffman_only = Z_HUFFMAN_ONLY;
// Status codes
const int okay = Z_OK;
const int stream_end = Z_STREAM_END;
const int stream_error = Z_STREAM_ERROR;
const int version_error = Z_VERSION_ERROR;
const int data_error = Z_DATA_ERROR;
const int mem_error = Z_MEM_ERROR;
const int buf_error = Z_BUF_ERROR;
// Flush codes
const int finish = Z_FINISH;
const int no_flush = Z_NO_FLUSH;
const int sync_flush = Z_SYNC_FLUSH;
// Code for current OS
//const int os_code = OS_CODE;
} // End namespace zlib.
//------------------Implementation of zlib_error------------------------------//
zlib_error::zlib_error(int error)
: BOOST_IOSTREAMS_FAILURE("zlib error"), error_(error)
{ }
void zlib_error::check(int error)
{
switch (error) {
case Z_OK:
case Z_STREAM_END:
//case Z_BUF_ERROR:
return;
case Z_MEM_ERROR:
throw std::bad_alloc();
default:
throw zlib_error(error);
;
}
}
//------------------Implementation of zlib_base-------------------------------//
namespace detail {
zlib_base::zlib_base()
: stream_(new z_stream), calculate_crc_(false), crc_(0)
{ }
zlib_base::~zlib_base() { delete static_cast<z_stream*>(stream_); }
void zlib_base::before( const char*& src_begin, const char* src_end,
char*& dest_begin, char* dest_end )
{
z_stream* s = static_cast<z_stream*>(stream_);
s->next_in = reinterpret_cast<zlib::byte*>(const_cast<char*>(src_begin));
s->avail_in = static_cast<zlib::uint>(src_end - src_begin);
s->next_out = reinterpret_cast<zlib::byte*>(dest_begin);
s->avail_out= static_cast<zlib::uint>(dest_end - dest_begin);
}
void zlib_base::after(const char*& src_begin, char*& dest_begin, bool compress)
{
z_stream* s = static_cast<z_stream*>(stream_);
char* next_in = reinterpret_cast<char*>(s->next_in);
char* next_out = reinterpret_cast<char*>(s->next_out);
if (calculate_crc_) {
const zlib::byte* buf = compress ?
reinterpret_cast<const zlib::byte*>(src_begin) :
reinterpret_cast<const zlib::byte*>(
const_cast<const char*>(dest_begin)
);
zlib::uint length = compress ?
static_cast<zlib::uint>(next_in - src_begin) :
static_cast<zlib::uint>(next_out - dest_begin);
if (length > 0)
crc_ = crc32(crc_, buf, length);
}
total_in_ = s->total_in;
total_out_ = s->total_out;
src_begin = const_cast<const char*>(next_in);
dest_begin = next_out;
}
int zlib_base::deflate(int flush)
{
return ::deflate(static_cast<z_stream*>(stream_), flush);
}
int zlib_base::inflate(int flush)
{
return ::inflate(static_cast<z_stream*>(stream_), flush);
}
void zlib_base::reset(bool compress, bool realloc)
{
z_stream* s = static_cast<z_stream*>(stream_);
// Undiagnosed bug:
// deflateReset(), etc., return Z_DATA_ERROR
//zlib_error::check(
realloc ?
(compress ? deflateReset(s) : inflateReset(s)) :
(compress ? deflateEnd(s) : inflateEnd(s))
;
//);
}
void zlib_base::do_init
( const zlib_params& p, bool compress,
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
zlib::alloc_func alloc, zlib::free_func free,
#endif
void* derived )
{
calculate_crc_ = p.calculate_crc;
z_stream* s = static_cast<z_stream*>(stream_);
// Current interface for customizing memory management
// is non-conforming and has been disabled:
//#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
// s->zalloc = alloc;
// s->zfree = free;
//#else
s->zalloc = 0;
s->zfree = 0;
//#endif
s->opaque = derived;
int window_bits = p.noheader? -p.window_bits : p.window_bits;
zlib_error::check(
compress ?
deflateInit2( s,
p.level,
p.method,
window_bits,
p.mem_level,
p.strategy ) :
inflateInit2(s, window_bits)
);
}
} // End namespace detail.
//----------------------------------------------------------------------------//
} } // End namespaces iostreams, boost.
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