139 lines
5.0 KiB
C++
139 lines
5.0 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: XMLRecognizer.hpp 555320 2007-07-11 16:05:13Z amassari $
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*/
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#if !defined(XERCESC_INCLUDE_GUARD_XMLRECOGNIZER_HPP)
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#define XERCESC_INCLUDE_GUARD_XMLRECOGNIZER_HPP
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#include <xercesc/util/XercesDefs.hpp>
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#include <xercesc/util/PlatformUtils.hpp>
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XERCES_CPP_NAMESPACE_BEGIN
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/**
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* This class provides some simple code to recognize the encodings of
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* XML files. This recognition only does very basic sensing of the encoding
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* in a broad sense. Basically its just enough to let us get started and
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* read the XMLDecl line. The scanner, once it reads the XMLDecl, will
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* tell the reader any actual encoding string it found and the reader can
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* update itself to be more specific at that point.
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*/
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class XMLPARSER_EXPORT XMLRecognizer
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{
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public :
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// -----------------------------------------------------------------------
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// Class types
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//
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// This enum represents the various encoding families that we have to
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// deal with individually at the scanner level. This does not indicate
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// the exact encoding, just the rough family that would let us scan
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// the XML/TextDecl to find the encoding string.
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//
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// The 'L's and 'B's stand for little or big endian.
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//
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// OtherEncoding means that its some transcoder based encoding, i.e. not
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// one of the ones that we do internally. Its a special case and should
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// never be used directly outside of the reader.
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//
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// NOTE: Keep this in sync with the name map array in the Cpp file!!
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// -----------------------------------------------------------------------
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enum Encodings
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{
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EBCDIC = 0
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, UCS_4B = 1
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, UCS_4L = 2
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, US_ASCII = 3
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, UTF_8 = 4
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, UTF_16B = 5
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, UTF_16L = 6
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, XERCES_XMLCH = 7
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, Encodings_Count
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, Encodings_Min = EBCDIC
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, Encodings_Max = XERCES_XMLCH
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, OtherEncoding = 999
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};
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// -----------------------------------------------------------------------
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// Public, const static data
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//
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// These are the byte sequences for each of the encodings that we can
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// auto sense, and their lengths.
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// -----------------------------------------------------------------------
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static const char fgASCIIPre[];
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static const XMLSize_t fgASCIIPreLen;
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static const XMLByte fgEBCDICPre[];
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static const XMLSize_t fgEBCDICPreLen;
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static const XMLByte fgUTF16BPre[];
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static const XMLByte fgUTF16LPre[];
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static const XMLSize_t fgUTF16PreLen;
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static const XMLByte fgUCS4BPre[];
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static const XMLByte fgUCS4LPre[];
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static const XMLSize_t fgUCS4PreLen;
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static const char fgUTF8BOM[];
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static const XMLSize_t fgUTF8BOMLen;
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// -----------------------------------------------------------------------
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// Encoding recognition methods
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// -----------------------------------------------------------------------
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static Encodings basicEncodingProbe
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(
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const XMLByte* const rawBuffer
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, const XMLSize_t rawByteCount
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);
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static Encodings encodingForName
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(
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const XMLCh* const theEncName
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);
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static const XMLCh* nameForEncoding(const Encodings theEncoding
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, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
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protected :
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// -----------------------------------------------------------------------
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// Unimplemented constructors, operators, and destructor
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//
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// This class is effectively being used as a namespace for some static
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// methods.
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//
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// (these functions are protected rather than private only to get rid of
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// some annoying compiler warnings.)
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//
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// -----------------------------------------------------------------------
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XMLRecognizer();
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~XMLRecognizer();
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private:
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// -----------------------------------------------------------------------
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// Unimplemented constructors and operators
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// -----------------------------------------------------------------------
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XMLRecognizer(const XMLRecognizer&);
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XMLRecognizer& operator=(const XMLRecognizer&);
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};
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XERCES_CPP_NAMESPACE_END
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#endif
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