mimescan.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

 /*
 * Tokenizer and buffered input classes to scan MIME messages
 */

#ifndef _MIMESCAN_H_
#define _MIMESCAN_H_

#include <ctype.h>
#include "hxstring.h"

class MIMEInputStream
{
public:
    MIMEInputStream(const char* pBuf, UINT32 nBufLen);
    MIMEInputStream(const CHXString& str);
    ~MIMEInputStream();

    int read();
    int peek();
    int read(char* pBuf, UINT32 nBufLen);
    UINT32 available();
    UINT32 offset() { return (!m_bUndoValid) ? m_nCurOffset : m_nCurOffset-1; }
    UINT32 length() { return m_nBufSize; }
    void putBack(int ch) 
    {
	// If somone tries to push back a EOF ignore it..
	if(ch != -1)
	{
	    m_bUndoValid = TRUE;
	    m_nUndo = ch; 
	}
    }
    UINT32 max_distance_to(char* p);

private:
    char* m_pBuffer;
    UINT32 m_nBufSize;
    UINT32 m_nCurOffset;
    BOOL m_bUndoValid;
    int m_nUndo;
};

/*
 * Stores the token string and the last character for look-ahead
 */
class MIMEToken
{
public:
    enum { T_EOF=-1, T_EOL='\n' };
    MIMEToken():
	m_value(""),
	m_lastChar(-1)
    {}
    MIMEToken(const char* value, char lastChar):
	m_value(value),
	m_lastChar(lastChar)
    {}
    MIMEToken(char lastChar):
	m_value(""),
	m_lastChar(lastChar)
    {}
    const CHXString& value() { return m_value; }
    const signed char lastChar() { return m_lastChar; }
    int hasValue();

private:
    CHXString m_value;
    int m_lastChar;
};

inline int
MIMEToken::hasValue()
{
    int b = 0;
    for(unsigned int i=0; i < m_value.GetLength(); i++)
	if(!isspace(m_value[i]))
	    b = 1;
    return b;
}

class MIMEScanner
{
public:
    MIMEScanner(MIMEInputStream& input);
    ~MIMEScanner();

    MIMEToken nextToken(char* upTo = 0);
    UINT32 offset() { return m_input.offset(); }
    UINT32 length() { return m_input.length(); }

private:
    void skipWS();

    CHXString m_tokstr;
    CHXString m_line;
    MIMEInputStream& m_input;
};

#endif /* _MIMESCAN_H_ */