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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.
// To configure Boost to work with libbz2, 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/gzip.hpp>
#include <boost/throw_exception.hpp>
namespace boost { namespace iostreams {
//------------------Implementation of gzip_header-----------------------------//
namespace detail {
void gzip_header::process(char c)
{
uint8_t value = static_cast<uint8_t>(c);
switch (state_) {
case s_id1:
if (value != gzip::magic::id1)
boost::throw_exception(gzip_error(gzip::bad_header));
state_ = s_id2;
break;
case s_id2:
if (value != gzip::magic::id2)
boost::throw_exception(gzip_error(gzip::bad_header));
state_ = s_cm;
break;
case s_cm:
if (value != gzip::method::deflate)
boost::throw_exception(gzip_error(gzip::bad_method));
state_ = s_flg;
break;
case s_flg:
flags_ = value;
state_ = s_mtime;
break;
case s_mtime:
mtime_ += value << (offset_ * 8);
if (offset_ == 3) {
state_ = s_xfl;
offset_ = 0;
} else {
++offset_;
}
break;
case s_xfl:
state_ = s_os;
break;
case s_os:
os_ = value;
if (flags_ & gzip::flags::extra) {
state_ = s_xlen;
} else if (flags_ & gzip::flags::name) {
state_ = s_name;
} else if (flags_ & gzip::flags::comment) {
state_ = s_comment;
} else if (flags_ & gzip::flags::header_crc) {
state_ = s_hcrc;
} else {
state_ = s_done;
}
break;
case s_xlen:
xlen_ += value << (offset_ * 8);
if (offset_ == 1) {
state_ = s_extra;
offset_ = 0;
} else {
++offset_;
}
break;
case s_extra:
if (--xlen_ == 0) {
if (flags_ & gzip::flags::name) {
state_ = s_name;
} else if (flags_ & gzip::flags::comment) {
state_ = s_comment;
} else if (flags_ & gzip::flags::header_crc) {
state_ = s_hcrc;
} else {
state_ = s_done;
}
}
break;
case s_name:
if (c != 0) {
file_name_ += c;
} else if (flags_ & gzip::flags::comment) {
state_ = s_comment;
} else if (flags_ & gzip::flags::header_crc) {
state_ = s_hcrc;
} else {
state_ = s_done;
}
break;
case s_comment:
if (c != 0) {
comment_ += c;
} else if (flags_ & gzip::flags::header_crc) {
state_ = s_hcrc;
} else {
state_ = s_done;
}
break;
case s_hcrc:
if (offset_ == 1) {
state_ = s_done;
offset_ = 0;
} else {
++offset_;
}
break;
default:
BOOST_ASSERT(0);
}
}
void gzip_header::reset()
{
file_name_.clear();
comment_.clear();
os_ = flags_ = offset_ = xlen_ = 0;
mtime_ = 0;
state_ = s_id1;
}
//------------------Implementation of gzip_footer-----------------------------//
void gzip_footer::process(char c)
{
uint8_t value = static_cast<uint8_t>(c);
if (state_ == s_crc) {
crc_ += value << (offset_ * 8);
if (offset_ == 3) {
state_ = s_isize;
offset_ = 0;
} else {
++offset_;
}
} else if (state_ == s_isize) {
isize_ += value << (offset_ * 8);
if (offset_ == 3) {
state_ = s_done;
offset_ = 0;
} else {
++offset_;
}
} else {
BOOST_ASSERT(0);
}
}
void gzip_footer::reset()
{
crc_ = isize_ = offset_ = 0;
state_ = s_crc;
}
} // End namespace boost::iostreams::detail.
} } // End namespaces iostreams, boost.
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