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/* |
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zipstream Library License: |
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-------------------------- |
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|
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The zlib/libpng License Copyright (c) 2003 Jonathan de Halleux. |
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|
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This software is provided 'as-is', without any express or implied warranty. In |
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no event will the authors be held liable for any damages arising from the use |
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of this software. |
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|
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Permission is granted to anyone to use this software for any purpose, |
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including commercial applications, and to alter it and redistribute it freely, |
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subject to the following restrictions: |
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|
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1. The origin of this software must not be misrepresented; you must not claim |
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that you wrote the original software. If you use this software in a |
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product, an acknowledgment in the product documentation would be |
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appreciated but is not required. |
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|
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2. Altered source versions must be plainly marked as such, and must not be |
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misrepresented as being the original software. |
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|
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3. This notice may not be removed or altered from any source distribution |
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|
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Author: Jonathan de Halleux, dehalleux@pelikhan.com, 2003 |
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|
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Altered by: Andreas Zieringer 2003 for OpenSG project |
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made it platform independent, gzip conform, fixed gzip footer |
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|
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Altered by: Geoffrey Hutchison 2005 for Open Babel project |
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minor namespace modifications, VC++ compatibility |
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*/ |
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|
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#ifndef _ZIPSTREAM_H_ |
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#define _ZIPSTREAM_H_ |
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|
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#include <vector> |
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#include <string> |
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#include <streambuf> |
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#include <sstream> |
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#include <iostream> |
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#include <algorithm> |
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|
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#include <zlib.h> |
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|
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#ifdef WIN32 /* Window 95 & Windows NT */ |
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# define OS_CODE 0x0b |
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#endif |
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#if defined(MACOS) || defined(TARGET_OS_MAC) |
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# define OS_CODE 0x07 |
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#endif |
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#ifndef OS_CODE |
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# define OS_CODE 0x03 /* assume Unix */ |
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#endif |
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|
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namespace zlib_stream { |
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|
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namespace detail |
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{ |
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const int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */ |
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|
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/* gzip flag byte */ |
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const int gz_ascii_flag = 0x01; /* bit 0 set: file probably ascii text */ |
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const int gz_head_crc = 0x02; /* bit 1 set: header CRC present */ |
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const int gz_extra_field = 0x04; /* bit 2 set: extra field present */ |
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const int gz_orig_name = 0x08; /* bit 3 set: original file name present */ |
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const int gz_comment = 0x10; /* bit 4 set: file comment present */ |
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const int gz_reserved = 0xE0; /* bits 5..7: reserved */ |
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} |
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|
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/// default gzip buffer size, |
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/// change this to suite your needs |
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const size_t zstream_default_buffer_size = 4096; |
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|
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/// Compression strategy, see zlib doc. |
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enum EStrategy |
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{ |
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StrategyFiltered = 1, |
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StrategyHuffmanOnly = 2, |
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DefaultStrategy = 0 |
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}; |
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|
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//***************************************************************************** |
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// template class basic_zip_streambuf |
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//***************************************************************************** |
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|
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/** \brief A stream decorator that takes raw input and zips it to a ostream. |
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|
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The class wraps up the inflate method of the zlib library 1.1.4 http://www.gzip.org/zlib/ |
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*/ |
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template <class charT, |
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class traits = std::char_traits<charT> > |
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class basic_zip_streambuf : public std::basic_streambuf<charT, traits> |
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{ |
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public: |
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typedef std::basic_ostream<charT, traits>& ostream_reference; |
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typedef unsigned char byte_type; |
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typedef char char_type; |
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typedef byte_type* byte_buffer_type; |
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typedef std::vector<byte_type> byte_vector_type; |
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typedef std::vector<char_type> char_vector_type; |
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typedef int int_type; |
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|
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basic_zip_streambuf(ostream_reference ostream, |
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int level, |
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EStrategy strategy, |
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int window_size, |
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int memory_level, |
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size_t buffer_size); |
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|
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~basic_zip_streambuf(void); |
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|
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int sync (void); |
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int_type overflow (int_type c); |
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std::streamsize flush (void); |
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inline |
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ostream_reference get_ostream (void) const; |
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inline |
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int get_zerr (void) const; |
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inline |
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unsigned long get_crc (void) const; |
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inline |
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unsigned long get_in_size (void) const; |
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inline |
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long get_out_size(void) const; |
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|
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private: |
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|
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bool zip_to_stream(char_type *buffer, |
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std::streamsize buffer_size); |
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|
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ostream_reference _ostream; |
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z_stream _zip_stream; |
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int _err; |
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byte_vector_type _output_buffer; |
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char_vector_type _buffer; |
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unsigned long _crc; |
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}; |
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|
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|
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//***************************************************************************** |
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// template class basic_unzip_streambuf |
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//***************************************************************************** |
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|
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/** \brief A stream decorator that takes compressed input and unzips it to a istream. |
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|
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The class wraps up the deflate method of the zlib library 1.1.4 http://www.gzip.org/zlib/ |
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*/ |
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template <class charT, |
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class traits = std::char_traits<charT> > |
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class basic_unzip_streambuf : |
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public std::basic_streambuf<charT, traits> |
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{ |
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public: |
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typedef std::basic_istream<charT,traits>& istream_reference; |
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typedef unsigned char byte_type; |
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typedef charT char_type; |
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typedef byte_type* byte_buffer_type; |
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typedef std::vector<byte_type> byte_vector_type; |
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typedef std::vector<char_type> char_vector_type; |
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typedef int int_type; |
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|
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/** Construct a unzip stream |
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* More info on the following parameters can be found in the zlib documentation. |
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*/ |
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basic_unzip_streambuf(istream_reference istream, |
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int window_size, |
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size_t read_buffer_size, |
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size_t input_buffer_size); |
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|
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~basic_unzip_streambuf(void); |
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|
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int_type underflow(void); |
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|
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/// returns the compressed input istream |
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inline |
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istream_reference get_istream (void); |
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inline |
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z_stream& get_zip_stream (void); |
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inline |
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int get_zerr (void) const; |
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inline |
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unsigned long get_crc (void) const; |
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inline |
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long get_out_size (void) const; |
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inline |
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long get_in_size (void) const; |
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|
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|
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private: |
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|
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void put_back_from_zip_stream (void); |
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|
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std::streamsize unzip_from_stream (char_type* buffer, |
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std::streamsize buffer_size); |
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|
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size_t fill_input_buffer (void); |
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|
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istream_reference _istream; |
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z_stream _zip_stream; |
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int _err; |
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byte_vector_type _input_buffer; |
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char_vector_type _buffer; |
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unsigned long _crc; |
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}; |
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|
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//***************************************************************************** |
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// template class basic_zip_ostream |
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//***************************************************************************** |
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|
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template <class charT, |
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class traits = std::char_traits<charT> > |
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class basic_zip_ostream : |
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public basic_zip_streambuf<charT, traits>, |
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public std::basic_ostream<charT, traits> |
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{ |
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public: |
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|
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typedef char char_type; |
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typedef std::basic_ostream<charT, traits>& ostream_reference; |
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typedef std::basic_ostream<charT, traits> ostream_type; |
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|
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inline |
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explicit basic_zip_ostream(ostream_reference ostream, |
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bool is_gzip = false, |
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int level = Z_DEFAULT_COMPRESSION, |
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EStrategy strategy = DefaultStrategy, |
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int window_size = -15 /*windowBits is passed < 0 to suppress zlib header */, |
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int memory_level = 8, |
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size_t buffer_size = zstream_default_buffer_size); |
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|
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~basic_zip_ostream(void); |
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|
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inline |
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bool is_gzip (void) const; |
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inline |
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basic_zip_ostream<charT, traits>& zflush (void); |
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void finished (void); |
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|
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void make_gzip() |
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{ add_header(); _is_gzip = true; } |
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|
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private: |
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|
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basic_zip_ostream<charT,traits>& add_header(void); |
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basic_zip_ostream<charT,traits>& add_footer(void); |
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|
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bool _is_gzip; |
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bool _added_footer; |
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}; |
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|
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//***************************************************************************** |
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// template class basic_zip_istream |
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//***************************************************************************** |
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|
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template <class charT, |
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class traits = std::char_traits<charT> > |
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class basic_zip_istream : |
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public basic_unzip_streambuf<charT, traits>, |
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public std::basic_istream<charT, traits> |
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{ |
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public: |
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typedef std::basic_istream<charT, traits>& istream_reference; |
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typedef std::basic_istream<charT, traits> istream_type; |
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|
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explicit basic_zip_istream(istream_reference istream, |
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int window_size = -15 /*windowBits is passed < 0 to suppress zlib header */, |
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size_t read_buffer_size = zstream_default_buffer_size, |
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size_t input_buffer_size = zstream_default_buffer_size); |
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|
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inline |
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bool is_gzip (void) const; |
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inline |
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bool check_crc (void); |
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inline |
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bool check_data_size (void) const; |
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inline |
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long get_gzip_crc (void) const; |
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inline |
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long get_gzip_data_size(void) const; |
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|
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protected: |
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|
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int check_header (void); |
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void read_footer (void); |
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|
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bool _is_gzip; |
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long _gzip_crc; |
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long _gzip_data_size; |
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}; |
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|
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/// A typedef for basic_zip_ostream<char> |
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typedef basic_zip_ostream<char> zip_ostream; |
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/// A typedef for basic_zip_istream<char> |
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typedef basic_zip_istream<char> zip_istream; |
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|
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/// A typedef for basic_zip_ostream<wchar_t> |
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//typedef basic_zip_ostream<wchar_t> zip_wostream; |
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/// A typedef for basic_zip_istream<wchart> |
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//typedef basic_zip_istream<wchar_t> zip_wistream; |
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|
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//! Helper function to check whether stream is compressed or not. |
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inline bool isGZip(std::istream &is) |
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{ |
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const int gz_magic[2] = {0x1f, 0x8b}; |
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|
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int c1 = (int) is.get(); |
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if(c1 != gz_magic[0]) |
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{ |
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is.putback(c1); |
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return false; |
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} |
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|
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int c2 = (int) is.get(); |
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if(c2 != gz_magic[1]) |
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{ |
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is.putback(c2); |
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is.putback(c1); |
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return false; |
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} |
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|
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is.putback(c2); |
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is.putback(c1); |
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return true; |
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} |
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|
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#include "zipstreamimpl.hpp" |
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|
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} |
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|
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#endif // _ZIPSTREAM_H_ |
