FM / filter

/usr/include/boost/iostreams/filter

Name	Size	Mode	Actions
aggregate.hpp	5288	0644	edit dl rm
bzip2.hpp	14004	0644	edit dl rm
counter.hpp	2424	0644	edit dl rm
grep.hpp	3573	0644	edit dl rm
gzip.hpp	24804	0644	edit dl rm
line.hpp	7089	0644	edit dl rm
lzma.hpp	12550	0644	edit dl rm
newline.hpp	12174	0644	edit dl rm
regex.hpp	4112	0644	edit dl rm
stdio.hpp	3232	0644	edit dl rm
symmetric.hpp	10836	0644	edit dl rm
test.hpp	10595	0644	edit dl rm
zlib.hpp	14943	0644	edit dl rm
zstd.hpp	11967	0644	edit dl rm

Edit: /usr/include/boost/iostreams/filter/gzip.hpp (24804B)

// (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.

// Contains the definitions of the class templates gzip_compressor and
// gzip_decompressor for reading and writing files in the gzip file format
// (RFC 1952). Based in part on work of Jonathan de Halleux; see [...]

#ifndef BOOST_IOSTREAMS_GZIP_HPP_INCLUDED
#define BOOST_IOSTREAMS_GZIP_HPP_INCLUDED

#if defined(_MSC_VER)
# pragma once
#endif

#include <boost/config.hpp> // STATIC_CONSTANT, STDC_NAMESPACE, 
                            // DINKUMWARE_STDLIB, __STL_CONFIG_H.
#include <algorithm>                      // min.
#include <boost/assert.hpp>
#include <cstdio>                         // EOF.
#include <cstddef>                        // size_t.
#include <ctime>                          // std::time_t.
#include <memory>                         // allocator.
#include <boost/config.hpp>               // Put size_t in std.
#include <boost/detail/workaround.hpp>
#include <boost/cstdint.hpp>              // uint8_t, uint32_t.
#include <boost/iostreams/checked_operations.hpp>
#include <boost/iostreams/constants.hpp>  // buffer size.
#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>
#include <boost/iostreams/detail/adapter/range_adapter.hpp>
#include <boost/iostreams/detail/char_traits.hpp>
#include <boost/iostreams/detail/ios.hpp> // failure, streamsize.
#include <boost/iostreams/detail/error.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/iostreams/device/back_inserter.hpp>
#include <boost/iostreams/filter/zlib.hpp>
#include <boost/iostreams/pipeline.hpp>     
#include <boost/iostreams/putback.hpp>
#include <boost/throw_exception.hpp>

// Must come last.
#if defined(BOOST_MSVC)
# pragma warning(push)
# pragma warning(disable:4244)    // Possible truncation
# pragma warning(disable:4251)    // Missing DLL interface for std::string
# pragma warning(disable:4309)    // Truncation of constant value.
#endif

#ifdef BOOST_NO_STDC_NAMESPACE
namespace std { using ::time_t; }
#endif

namespace boost { namespace iostreams {
                    
//------------------Definitions of constants----------------------------------//

namespace gzip {

using namespace boost::iostreams::zlib;

// Error codes used by gzip_error.

const int zlib_error        = 1;
const int bad_crc           = 2; // Recorded crc doesn't match data.
const int bad_length        = 3; // Recorded length doesn't match data.
const int bad_header        = 4; // Malformed header.
const int bad_footer        = 5; // Malformed footer.
const int bad_method        = 6; // Unsupported compression method.

namespace magic {

// Magic numbers used by gzip header.

const int id1               = 0x1f;
const int id2               = 0x8b;

} // End namespace magic.

namespace method {

// Codes used for the 'CM' byte of the gzip header.

const int deflate           = 8;

} // End namespace method.

namespace flags {

// Codes used for the 'FLG' byte of the gzip header.

const int text              = 1;
const int header_crc        = 2;
const int extra             = 4;
const int name              = 8;
const int comment           = 16;

} // End namespace flags.

namespace extra_flags {

// Codes used for the 'XFL' byte of the gzip header.

const int best_compression  = 2;
const int best_speed        = 4;

} // End namespace extra_flags.

// Codes used for the 'OS' byte of the gzip header.

const int os_fat            = 0;
const int os_amiga          = 1;
const int os_vms            = 2;
const int os_unix           = 3;
const int os_vm_cms         = 4;
const int os_atari          = 5;
const int os_hpfs           = 6;
const int os_macintosh      = 7;
const int os_z_system       = 8;
const int os_cp_m           = 9;
const int os_tops_20        = 10;
const int os_ntfs           = 11;
const int os_qdos           = 12;
const int os_acorn          = 13;
const int os_unknown        = 255;

} // End namespace gzip.

//------------------Definition of gzip_params---------------------------------//

//
// Class name: gzip_params.
// Description: Subclass of zlib_params with an additional field
//      representing a file name.
//
struct gzip_params : zlib_params {

// Non-explicit constructor.
    gzip_params( int level              = gzip::default_compression,
                 int method             = gzip::deflated,
                 int window_bits        = gzip::default_window_bits,
                 int mem_level          = gzip::default_mem_level,
                 int strategy           = gzip::default_strategy,
                 std::string file_name_  = "",
                 std::string comment_    = "",
                 std::time_t mtime_      = 0 )
        : zlib_params(level, method, window_bits, mem_level, strategy),
          file_name(file_name_), comment(comment_), mtime(mtime_)
        { }
    std::string  file_name;
    std::string  comment;
    std::time_t  mtime;
};

//------------------Definition of gzip_error----------------------------------//

//
// Class name: gzip_error.
// Description: Subclass of std::ios_base::failure thrown to indicate
//     zlib errors other than out-of-memory conditions.
//
class gzip_error : public BOOST_IOSTREAMS_FAILURE {
public:
    explicit gzip_error(int error)
        : BOOST_IOSTREAMS_FAILURE("gzip error"),
          error_(error), zlib_error_code_(zlib::okay) { }
    explicit gzip_error(const zlib_error& e)
        : BOOST_IOSTREAMS_FAILURE("gzip error"),
          error_(gzip::zlib_error), zlib_error_code_(e.error())
        { }
    int error() const { return error_; }
    int zlib_error_code() const { return zlib_error_code_; }
private:
    int error_;
    int zlib_error_code_;
};

//------------------Definition of gzip_compressor-----------------------------//

//
// Template name: gzip_compressor
// Description: Model of OutputFilter implementing compression in the
//      gzip format.
//
template<typename Alloc = std::allocator<char> >
class basic_gzip_compressor : basic_zlib_compressor<Alloc> {
private:
    typedef basic_zlib_compressor<Alloc>  base_type;
public:
    typedef char char_type;
    struct category
        : dual_use,
          filter_tag,
          multichar_tag,
          closable_tag
        { };
    basic_gzip_compressor( const gzip_params& = gzip::default_compression,
                           std::streamsize buffer_size = default_device_buffer_size );

template<typename Source>
    std::streamsize read(Source& src, char_type* s, std::streamsize n)
    {
        std::streamsize result = 0;

// Read header.
        if (!(flags_ & f_header_done))
            result += read_string(s, n, header_);

// Read body.
        if (!(flags_ & f_body_done)) {

// Read from basic_zlib_filter.
            std::streamsize amt = base_type::read(src, s + result, n - result);
            if (amt != -1) {
                result += amt;
                if (amt < n - result) { // Double-check for EOF.
                    amt = base_type::read(src, s + result, n - result);
                    if (amt != -1)
                        result += amt;
                }
            }
            if (amt == -1)
                prepare_footer();
        }

// Read footer.
        if ((flags_ & f_body_done) != 0 && result < n)
            result += read_string(s + result, n - result, footer_);

return result != 0 ? result : -1;
    }

template<typename Sink>
    std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
    {
        if (!(flags_ & f_header_done)) {
            std::streamsize amt = 
                static_cast<std::streamsize>(header_.size() - offset_);
            offset_ += boost::iostreams::write_if(snk, header_.data() + offset_, amt);
            if (offset_ == header_.size())
                flags_ |= f_header_done;
            else
                return 0;
        }
        return base_type::write(snk, s, n);
    }

template<typename Sink>
    void close(Sink& snk, BOOST_IOS::openmode m)
    {
        try {
            if (m == BOOST_IOS::out && !(flags_ & f_header_done))
                this->write(snk, 0, 0);

// Close zlib compressor.
            base_type::close(snk, m);

if (m == BOOST_IOS::out) {
                if (flags_ & f_header_done) {

// Write final fields of gzip file format.
                    write_long(this->crc(), snk);
                    write_long(this->total_in(), snk);
                }
            }
        } catch(...) {
            close_impl();
            throw;
        }
        close_impl();
    }
private:
    static gzip_params normalize_params(gzip_params p);
    void prepare_footer();
    std::streamsize read_string(char* s, std::streamsize n, std::string& str);

template<typename Sink>
    static void write_long(long n, Sink& next, boost::mpl::true_)
    {
        boost::iostreams::put(next, static_cast<char>(0xFF & n));
        boost::iostreams::put(next, static_cast<char>(0xFF & (n >> 8)));
        boost::iostreams::put(next, static_cast<char>(0xFF & (n >> 16)));
        boost::iostreams::put(next, static_cast<char>(0xFF & (n >> 24)));
    }
    template<typename Sink>
    static void write_long(long, Sink&, boost::mpl::false_)
    {
    }
    template<typename Sink>
    static void write_long(long n, Sink& next)
    {
        typedef typename category_of<Sink>::type category;
        typedef is_convertible<category, output> can_write;
        write_long(n, next, can_write());
    }

void close_impl()
    {
        footer_.clear();
        offset_ = 0;
        flags_ = 0;
    }

enum state_type {
        f_header_done = 1,
        f_body_done = f_header_done << 1,
        f_footer_done = f_body_done << 1
    };
    std::string  header_;
    std::string  footer_;
    std::size_t  offset_;
    int          flags_;
};
BOOST_IOSTREAMS_PIPABLE(basic_gzip_compressor, 1)

typedef basic_gzip_compressor<> gzip_compressor;

//------------------Definition of helper templates for decompression----------//

namespace detail {

// Processes gzip headers
class BOOST_IOSTREAMS_DECL gzip_header {
public:
    gzip_header() { reset(); }

// Members for processing header data
    void process(char c);
    bool done() const { return state_ == s_done; }
    void reset();

// Members for accessing header data
    std::string file_name() const { return file_name_; }
    std::string comment() const { return comment_; }
    bool text() const { return (flags_ & gzip::flags::text) != 0; }
    int os() const { return os_; }
    std::time_t mtime() const { return mtime_; }
private:
    enum state_type {
        s_id1       = 1,
        s_id2       = s_id1 + 1,
        s_cm        = s_id2 + 1,
        s_flg       = s_cm + 1,
        s_mtime     = s_flg + 1,
        s_xfl       = s_mtime + 1,
        s_os        = s_xfl + 1,
        s_xlen      = s_os + 1,
        s_extra     = s_xlen + 1,
        s_name      = s_extra + 1,
        s_comment   = s_name + 1,
        s_hcrc      = s_comment + 1,
        s_done      = s_hcrc + 1
    };
    std::string  file_name_;
    std::string  comment_;
    int          os_;
    std::time_t  mtime_;
    int          flags_;
    int          state_;
    int          offset_;  // Offset within fixed-length region.
    int          xlen_;    // Bytes remaining in extra field.
};

// Processes gzip footers
class BOOST_IOSTREAMS_DECL gzip_footer {
public:
    gzip_footer() { reset(); }
    
    // Members for processing footer data
    void process(char c);
    bool done() const { return state_ == s_done; }
    void reset();
    
    // Members for accessing footer data
    zlib::ulong crc() const { return crc_; }
    zlib::ulong uncompressed_size() const { return isize_; }
private:
    enum state_type {
        s_crc     = 1,
        s_isize   = s_crc + 1,
        s_done    = s_isize + 1
    };
    zlib::ulong  crc_;
    zlib::ulong  isize_;
    int          state_;
    int          offset_; 
};

} // End namespace boost::iostreams::detail.

//------------------Definition of basic_gzip_decompressor---------------------//

//
// Template name: basic_gzip_decompressor
// Description: Model of InputFilter implementing compression in the
//      gzip format.
//
template<typename Alloc = std::allocator<char> >
class basic_gzip_decompressor : basic_zlib_decompressor<Alloc> {
private:
    typedef basic_zlib_decompressor<Alloc>   base_type;
    typedef typename base_type::string_type  string_type;
public:
    typedef char char_type;
    struct category
        : dual_use,
          filter_tag,
          multichar_tag,
          closable_tag
        { };
    basic_gzip_decompressor( int window_bits = gzip::default_window_bits,
                             std::streamsize buffer_size = default_device_buffer_size );

template<typename Sink>
    std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
    {
        std::streamsize result = 0;
        while(result < n) {
            if(state_ == s_start) {
                state_ = s_header;
                header_.reset();
                footer_.reset();
            }
            if (state_ == s_header) {
                int c = s[result++];
                header_.process(c);
                if (header_.done())
                    state_ = s_body;
            } else if (state_ == s_body) {
                try {
                    std::streamsize amt = 
                        base_type::write(snk, s + result, n - result);
                    result += amt;
                    if (!this->eof()) {
                        break;
                    } else {
                        state_ = s_footer;
                    }
                } catch (const zlib_error& e) {
                    boost::throw_exception(gzip_error(e));
                }
            } else { // state_ == s_footer
                if (footer_.done()) {
                    if (footer_.crc() != this->crc())
                        boost::throw_exception(gzip_error(gzip::bad_crc));

base_type::close(snk, BOOST_IOS::out);
                    state_ = s_start;
                } else {
                    int c = s[result++];
                    footer_.process(c);
                }
            }
        }
        return result;
    }

template<typename Source>
    std::streamsize read(Source& src, char_type* s, std::streamsize n)
    {
        typedef char_traits<char>  traits_type;
        std::streamsize            result = 0;
        peekable_source<Source>    peek(src, putback_);
        while (result < n && state_ != s_done) {
            if (state_ == s_start) {
                state_ = s_header;
                header_.reset();
                footer_.reset();
            }
            if (state_ == s_header) {
                int c = boost::iostreams::get(peek);
                if (traits_type::is_eof(c)) {
                    boost::throw_exception(gzip_error(gzip::bad_header));
                } else if (traits_type::would_block(c)) {
                    break;
                }
                header_.process(c);
                if (header_.done())
                    state_ = s_body;
            } else if (state_ == s_body) {
                try {
                    std::streamsize amt = 
                        base_type::read(peek, s + result, n - result);
                    if (amt != -1) {
                        result += amt;
                        if (amt < n - result)
                            break;
                    } else {
                        peek.putback(this->unconsumed_input());
                        state_ = s_footer;
                    }
                } catch (const zlib_error& e) {
                    boost::throw_exception(gzip_error(e));
                }
            } else { // state_ == s_footer
                int c = boost::iostreams::get(peek);
                if (traits_type::is_eof(c)) {
                    boost::throw_exception(gzip_error(gzip::bad_footer));
                } else if (traits_type::would_block(c)) {
                    break;
                }
                footer_.process(c);
                if (footer_.done()) {
                    if (footer_.crc() != this->crc())
                        boost::throw_exception(gzip_error(gzip::bad_crc));
                    c = boost::iostreams::get(peek);
                    if (traits_type::is_eof(c)) {
                        state_ = s_done;
                    } else {
                        peek.putback(c);
                        base_type::close(peek, BOOST_IOS::in);
                        state_ = s_start;
                        header_.reset();
                        footer_.reset();
                    }
                }
            }
        }
        if (peek.has_unconsumed_input()) {
            putback_ = peek.unconsumed_input();
        } else {
            putback_.clear();
        }
        return result != 0 || state_ != s_done ?
            result :
            -1;
    }

template<typename Source>
    void close(Source& src, BOOST_IOS::openmode m)
    {
        try {
            base_type::close(src, m);
        } catch (const zlib_error& e) {
            state_ = s_start;
            boost::throw_exception(gzip_error(e));
        }
        if (m == BOOST_IOS::out) {
            if (state_ == s_start || state_ == s_header)
                boost::throw_exception(gzip_error(gzip::bad_header));
            else if (state_ == s_body)
                boost::throw_exception(gzip_error(gzip::bad_footer));
            else if (state_ == s_footer) {
                if (!footer_.done())
                    boost::throw_exception(gzip_error(gzip::bad_footer));
                else if(footer_.crc() != this->crc())
                    boost::throw_exception(gzip_error(gzip::bad_crc));
            } else {
                BOOST_ASSERT(!"Bad state");
            }
        }
        state_ = s_start;
    }

std::string file_name() const { return header_.file_name(); }
    std::string comment() const { return header_.comment(); }
    bool text() const { return header_.text(); }
    int os() const { return header_.os(); }
    std::time_t mtime() const { return header_.mtime(); }
private:
    static gzip_params make_params(int window_bits);

// Source adapter allowing an arbitrary character sequence to be put back.
    template<typename Source>
    struct peekable_source {
        typedef char char_type;
        struct category : source_tag, peekable_tag { };
        explicit peekable_source(Source& src, const string_type& putback = "") 
            : src_(src), putback_(putback), offset_(0)
            { }
        std::streamsize read(char* s, std::streamsize n)
        {
            std::streamsize result = 0;

// Copy characters from putback buffer
            std::streamsize pbsize = 
                static_cast<std::streamsize>(putback_.size());
            if (offset_ < pbsize) {
                result = (std::min)(n, pbsize - offset_);
                BOOST_IOSTREAMS_CHAR_TRAITS(char)::copy(
                    s, putback_.data() + offset_, result);
                offset_ += result;
                if (result == n)
                    return result;
            }

// Read characters from src_
            std::streamsize amt = 
                boost::iostreams::read(src_, s + result, n - result);
            return amt != -1 ? 
                result + amt : 
                result ? result : -1;
        }
        bool putback(char c)
        {
            if (offset_) {
                putback_[--offset_] = c;
            } else {
                boost::throw_exception(
                    boost::iostreams::detail::bad_putback());
            }
            return true;
        }
        void putback(const string_type& s)
        {
            putback_.replace(0, offset_, s);
            offset_ = 0;
        }

// Returns true if some characters have been putback but not re-read.
        bool has_unconsumed_input() const 
        {
            return offset_ < static_cast<std::streamsize>(putback_.size());
        }

// Returns the sequence of characters that have been put back but not re-read.
        string_type unconsumed_input() const
        {
            return string_type(putback_, offset_, putback_.size() - offset_);
        }
        Source&          src_;
        string_type      putback_;
        std::streamsize  offset_;
    };

enum state_type {
        s_start   = 1,
        s_header  = s_start + 1,
        s_body    = s_header + 1,
        s_footer  = s_body + 1,
        s_done    = s_footer + 1
    };
    detail::gzip_header  header_;
    detail::gzip_footer  footer_;
    string_type          putback_;
    int                  state_;
};
BOOST_IOSTREAMS_PIPABLE(basic_gzip_decompressor, 1)

typedef basic_gzip_decompressor<> gzip_decompressor;

//------------------Implementation of gzip_compressor-------------------------//

template<typename Alloc>
basic_gzip_compressor<Alloc>::basic_gzip_compressor
    (const gzip_params& p, std::streamsize buffer_size)
    : base_type(normalize_params(p), buffer_size),
      offset_(0), flags_(0)
{
    // Calculate gzip header.
    bool has_name = !p.file_name.empty();
    bool has_comment = !p.comment.empty();

std::string::size_type length =
        10 +
        (has_name ? p.file_name.size() + 1 : 0) +
        (has_comment ? p.comment.size() + 1 : 0);
        // + 2; // Header crc confuses gunzip.
    int flags =
        //gzip::flags::header_crc +
        (has_name ? gzip::flags::name : 0) +
        (has_comment ? gzip::flags::comment : 0);
    int extra_flags =
        ( p.level == zlib::best_compression ?
              gzip::extra_flags::best_compression :
              0 ) +
        ( p.level == zlib::best_speed ?
              gzip::extra_flags::best_speed :
              0 );
    header_.reserve(length);
    header_ += gzip::magic::id1;                         // ID1.
    header_ += static_cast<char>(gzip::magic::id2);      // ID2.
    header_ += gzip::method::deflate;                    // CM.
    header_ += static_cast<char>(flags);                 // FLG.
    header_ += static_cast<char>(0xFF & p.mtime);        // MTIME.
    header_ += static_cast<char>(0xFF & (p.mtime >> 8));
    header_ += static_cast<char>(0xFF & (p.mtime >> 16));
    header_ += static_cast<char>(0xFF & (p.mtime >> 24));
    header_ += static_cast<char>(extra_flags);           // XFL.
    header_ += static_cast<char>(gzip::os_unknown);      // OS.
    if (has_name) {
        header_ += p.file_name;
        header_ += '\0';
    }
    if (has_comment) {
        header_ += p.comment;
        header_ += '\0';
    }
}

template<typename Alloc>
gzip_params basic_gzip_compressor<Alloc>::normalize_params(gzip_params p)
{
    p.noheader = true;
    p.calculate_crc = true;
    return p;
}

template<typename Alloc>
void basic_gzip_compressor<Alloc>::prepare_footer()
{
    boost::iostreams::back_insert_device<std::string> out(footer_);
    write_long(this->crc(), out);
    write_long(this->total_in(), out);
    flags_ |= f_body_done;
    offset_ = 0;
}

template<typename Alloc>
std::streamsize basic_gzip_compressor<Alloc>::read_string
    (char* s, std::streamsize n, std::string& str)
{
    std::streamsize avail =
        static_cast<std::streamsize>(str.size() - offset_);
    std::streamsize amt = (std::min)(avail, n);
    std::copy( str.data() + offset_,
               str.data() + offset_ + amt,
               s );
    offset_ += amt;
    if ( !(flags_ & f_header_done) &&
         offset_ == static_cast<std::size_t>(str.size()) )
    {
        flags_ |= f_header_done;
    }
    return amt;
}

//------------------Implementation of gzip_decompressor-----------------------//

template<typename Alloc>
basic_gzip_decompressor<Alloc>::basic_gzip_decompressor
    (int window_bits, std::streamsize buffer_size)
    : base_type(make_params(window_bits), buffer_size),
      state_(s_start)
    { }

template<typename Alloc>
gzip_params basic_gzip_decompressor<Alloc>::make_params(int window_bits)
{
    gzip_params p;
    p.window_bits = window_bits;
    p.noheader = true;
    p.calculate_crc = true;
    return p;
}

//----------------------------------------------------------------------------//

} } // End namespaces iostreams, boost.

#if defined(BOOST_MSVC)
# pragma warning(pop)
#endif

#endif // #ifndef BOOST_IOSTREAMS_GZIP_HPP_INCLUDED

cmd: