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// -*- C++ -*-
//=============================================================================
/**
* @file FileCharStream.h
*
* $Id$
*
* @author Nanbor Wang <nanbor@cs.wustl.edu>
*/
//=============================================================================
#ifndef _ACEXML_FILECHARSTREAM_H_
#define _ACEXML_FILECHARSTREAM_H_
#include "ace/pre.h"
#include "ACEXML/common/ACEXML_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ACEXML/common/CharStream.h"
#include "ACEXML/common/Encoding.h"
#include "ace/streams.h"
/**
* @class ACEXML_FileCharStream FileCharStream.h "ACEXML/common/FileCharStream.h"
*
* An implementation of ACEXML_CharStream for reading input from a file.
*/
class ACEXML_Export ACEXML_FileCharStream : public ACEXML_CharStream
{
public:
/// Default constructor.
ACEXML_FileCharStream (void);
/// Destructor
virtual ~ACEXML_FileCharStream (void);
/// Open a file.
int open (const ACEXML_Char *name);
/**
* Returns the available ACEXML_Char in the buffer. -1
* if the object is not initialized properly.
*/
virtual int available (void);
/**
* Close this stream and release all resources used by it.
*/
virtual int close (void);
/**
* Read the next ACEXML_Char. Return -1 if we are not able to
* return an ACEXML_Char, 0 if EOF is reached, or 1 if succeed.
*/
virtual int get (ACEXML_Char& ch);
/**
* Read the next batch of ACEXML_Char strings
*/
virtual int read (ACEXML_Char *str,
size_t len);
/**
* Determine the encoding of the file.
*/
virtual int determine_encoding (void);
/**
* Peek the next ACEXML_Char in the CharStream. Return the
* character if success, -1 if EOF is reached.
*/
virtual int peek (void);
/**
* Resets the file pointer to the beginning of the stream.
*/
virtual void rewind (void);
/*
* Get the character encoding for a byte stream or URI.
*/
virtual const ACEXML_Char *getEncoding (void);
protected:
/** Read the next character as a normal character. Return -1 if EOF is
* reached, else return 0.
*/
virtual int getchar_i (char& ch);
private:
#if defined (ACE_USES_WCHAR)
/**
* Read the next character from the stream taking into account the
* encoding of the file.
*/
int get_i (ACEXML_Char& ch);
/**
* Read the next character from the stream taking into account the
* encoding of the file. Subsequent call to get() returns this
* character.
*/
int peek_i (void);
#endif /* ACE_USES_WCHAR */
ACEXML_Char* filename_;
ACEXML_Char* encoding_;
off_t size_;
FILE* infile_;
// This is needed to ensure that we can implement a peek operation on a
// UTF-16 encoded file. It is a bit hackish, but there is no other way of
// implementing a peek() as the standard I/O FILE* guarantees only one
// pushback.
ACEXML_Char peek_;
};
#include "ace/post.h"
#endif /* _ACEXML_FILECHARSTREAM_H_ */
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