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// D4StreamUnMarshaller.h
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// -*- mode: c++; c-basic-offset:4 -*-
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// This file is part of libdap, A C++ implementation of the OPeNDAP Data
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// Access Protocol.
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// Copyright (c) 2012 OPeNDAP, Inc.
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// Author: James Gallagher <jgallagher@opendap.org>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
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#ifndef I_D4StreamUnMarshaller_h
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#define I_D4StreamUnMarshaller_h 1
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#include <iostream>
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// See comment in D4StreamMarshaller
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#define USE_XDR_FOR_IEEE754_ENCODING 0
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#if USE_XDR_FOR_IEEE754_ENCODING
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#ifdef WIN32
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#include <rpc.h>
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#include <winsock2.h>
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#include <xdr.h>
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#else
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#include <rpc/types.h>
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#include <netinet/in.h>
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#include <rpc/xdr.h>
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#endif
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#endif
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#include <crc.h>
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// #include "Type.h"
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#include "dods-datatypes.h"
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#include "UnMarshaller.h"
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#include "InternalErr.h"
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#include "util.h"
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#include "debug.h"
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using std::istream;
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namespace libdap {
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class Vector;
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/** @brief Read data from the stream made by D4StreamMarshaller.
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*/
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class D4StreamUnMarshaller: public UnMarshaller {
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public:
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const static unsigned int c_checksum_length = 4;
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private:
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istream &d_in;
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bool d_twiddle_bytes;
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#if USE_XDR_FOR_IEEE754_ENCODING
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// These are used for reals that need to be converted from IEEE 754
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XDR d_source;
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char d_buf[sizeof(dods_float64)];
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#endif
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D4StreamUnMarshaller();
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D4StreamUnMarshaller(const D4StreamUnMarshaller &);
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D4StreamUnMarshaller & operator=(const D4StreamUnMarshaller &);
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#if USE_XDR_FOR_IEEE754_ENCODING
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void m_deserialize_reals(char *val, int64_t num, int width, Type type);
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#endif
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void m_twidle_vector_elements(char *vals, int64_t num, int width);
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public:
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D4StreamUnMarshaller(istream &in, bool twiddle_bytes);
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D4StreamUnMarshaller(istream &in);
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virtual ~D4StreamUnMarshaller();
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void set_twiddle_bytes(bool twiddle) { d_twiddle_bytes = twiddle; }
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/**
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* @brief Is the data source we are reading from a big-endian machine?
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* We need this because the value of the CRC32 checksum is dependent on
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* byte order.
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*
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* @note This is somewhat tortured logic, but if this host is big-endian and
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* twiddle_bytes is not true, then the remote host must be big-endian. Similarly,
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* if this host is not big-endian and twiddle_bytes is true, then the remote
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* host must be big-endian
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*/
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bool is_source_big_endian() const { return (is_host_big_endian() && !d_twiddle_bytes)
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|| (!is_host_big_endian() && d_twiddle_bytes); }
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Crc32::checksum get_checksum();
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string get_checksum_str();
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int64_t get_count();
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virtual void get_byte(dods_byte &val;;
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virtual void get_int8(dods_int8 &val;;
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virtual void get_int16(dods_int16 &val;;
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virtual void get_int32(dods_int32 &val;;
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virtual void get_int64(dods_int64 &val;;
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virtual void get_float32(dods_float32 &val;;
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virtual void get_float64(dods_float64 &val;;
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virtual void get_uint16(dods_uint16 &val;;
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virtual void get_uint32(dods_uint32 &val;;
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virtual void get_uint64(dods_uint64 &val;;
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virtual void get_str(string &val;;
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virtual void get_url(string &val;;
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virtual void get_opaque(char *, unsigned int) {
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throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4, use get_opaque_dap4() instead.");
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}
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virtual void get_opaque_dap4(char **val, int64_t &len;;
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virtual void get_opaque_dap4( vector<uint8_t> &val );
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virtual void get_int(int &) {
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throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4");
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}
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// Note that DAP4 assumes clients know the size of arrays when they
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// read the data; it's the 'varying' get methods that read & return the
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// number of elements. These methods are here to appease the UnMarshaller
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// 'interface' code
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virtual void get_vector(char **, unsigned int &, Vector &) {
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throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4");
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}
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virtual void get_vector(char **, unsigned int &, int, Vector & ) {
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throw InternalErr(__FILE__, __LINE__, "Not implemented for DAP4");
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}
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virtual void get_vector(char *val, int64_t num_bytes);
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virtual void get_vector(char *val, int64_t num_elem, int elem_size);
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virtual void get_vector_float32(char *val, int64_t num_elem);
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virtual void get_vector_float64(char *val, int64_t num_elem);
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virtual void dump(ostream &strm) const;
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};
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} // namespace libdap
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#endif // I_D4StreamUnMarshaller_h
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