xmlencod.cpp

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/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: xmlencod.cpp,v 1.5.32.3 2004/07/09 01:44:10 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
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 * the file under the current version of the RealNetworks Community
 * Source License (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
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
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 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
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 * use your version of this file under the terms of any one of the
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 * 
 * 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.
 * 
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 * ***** END LICENSE BLOCK ***** */

#include "hxresult.h"
#include "hxassert.h"
#include "hxheap.h"

#include "hxstrutl.h"
#include "xmlencod.h"
#include "xmlvalid.h"

#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif

struct xmlEncodingInfo
{
    char*   m_pIANAName;		// name of charset, case-insensitive
    BOOL    m_bDoubleByte;		// true if DBCS charset
    BYTE    m_szLeadingByteRange[12];	// up to 5 zero-terminated
					// pairs of lead byte ranges
} ;

// Removed static here because it exercises a bug in gcc.  pgodman, 3/2/2000
const xmlEncodingInfo XMLEncodingInfo[] =
{
    { "Default", TRUE,	    // assume DBCS; any non-ASCII char is a lead byte
	0x81, 0xFF, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

    { "US-ASCII", FALSE, 
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

    { "Shift-JIS", TRUE, 
	0x81, 0x9F, 0xE0, 0xFC, 0x00, 0x00, 
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

    { "Big5", TRUE,
	0x81, 0xFE, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

    { "GB2312", TRUE,
	0xA1, 0xFE, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

    { "EUC-KR", TRUE,
	0x84, 0xD3, 0xD8, 0xD8, 0xD9, 0xDE,
	0xE0, 0xF9, 0x00, 0x00, 0x00, 0x00 },

    { "ISO-2022-KR", TRUE,
	0x81, 0xFE, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

    { "ISO-8859-1", FALSE,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

};

CHXXMLEncode::CHXXMLEncode(const char* pEncoding,
			   BYTE* pBuffer,
			   UINT32 ulLength):
    m_ulBufferLength(ulLength),
    m_pBuffer(pBuffer),
    m_pCurrent(pBuffer)
{
    m_lEncodingIndex = GetEncodingIndex(pEncoding);
}

CHXXMLEncode::CHXXMLEncode(const char* pEncoding,
			   BYTE* pStr):
    m_pBuffer(pStr),
    m_pCurrent(pStr)
{
    m_ulBufferLength = strlen((char*)pStr) + 1;
    m_lEncodingIndex = GetEncodingIndex(pEncoding);
}

CHXXMLEncode::CHXXMLEncode(const CHXXMLEncode& lhs)
{
    m_ulBufferLength = lhs.m_ulBufferLength;
    m_pBuffer = lhs.m_pBuffer;
    m_pCurrent = m_pBuffer;
    m_lEncodingIndex = lhs.m_lEncodingIndex;
}

CHXXMLEncode::~CHXXMLEncode()
{
}

const CHXXMLEncode&
CHXXMLEncode::operator=(const CHXXMLEncode& lhs)
{
    m_ulBufferLength = lhs.m_ulBufferLength;
    m_pBuffer = lhs.m_pBuffer;
    m_pCurrent = m_pBuffer;	// start at 0
    m_lEncodingIndex = lhs.m_lEncodingIndex;

    return *this;
}

CHXXMLEncode::operator const BYTE*() const
{
    return (const BYTE*)m_pBuffer;
}

BYTE*
CHXXMLEncode::operator+(int offset)
{
    BYTE* pCh = m_pCurrent;
    for(int nCount = 0; nCount < offset; ++nCount)
    {
	UINT16 uLen = 0;
	GetNextChar(uLen);
    }
    BYTE* pOffset = m_pCurrent;
    m_pCurrent = pCh;
    return pOffset;
}

BYTE*
CHXXMLEncode::operator+=(int offset)
{
    BYTE* pCh = m_pCurrent;
    for(int nCount = 0; nCount < offset; ++nCount)
    {
	UINT16 uLen = 0;
	pCh = GetNextChar(uLen);
    }
    return pCh;
}

BYTE*
CHXXMLEncode::operator++(int)
{
    UINT16 uLen = 0;
    return GetNextChar(uLen);
}

BYTE*
CHXXMLEncode::operator--(int)
{
    UINT16 uLen = 0;
    return GetPrevChar(uLen);
}

BOOL
CHXXMLEncode::IsLeadByte(BYTE ch)
{
    int bRange = 0;

    const xmlEncodingInfo* pEncInfo = &(XMLEncodingInfo[m_lEncodingIndex]);
    if(pEncInfo->m_bDoubleByte)
    {
	while((bRange < 12) &&
	      (pEncInfo->m_szLeadingByteRange[bRange] != 0))
	{
	    if(ch >= pEncInfo->m_szLeadingByteRange[bRange] &&
	       ch <= pEncInfo->m_szLeadingByteRange[bRange + 1])
	    {
		return TRUE;
	    }
	    bRange += 2;
	}
    }
    return FALSE;
}

BYTE*
CHXXMLEncode::GetNextChar(UINT16& uLen)
{
    BYTE* pCh = m_pCurrent;
    if(IsLeadByte(*m_pCurrent))
    {
	m_pCurrent += 2;    // skip 2 bytes
	uLen = 2;
	return pCh;
    }
    m_pCurrent++;   // skip 1 byte
    uLen = 1;
    return pCh;
}

BYTE*
CHXXMLEncode::GetPrevChar(UINT16& uLen)
{
    BYTE* pCh = m_pCurrent;
    // assumes the m_pCurrent is on a boundary, i.e. it doesn't
    // point to the middle of a DBCS character

    // if current is at beginning or the previous byte is
    // at the beginning, return current
    if(m_pCurrent - 1 <= m_pBuffer)
    {
	return pCh;
    }

    // point to the previous byte
    BYTE* pTemp = m_pCurrent - 1;

    // if pTemp points to a lead byte, then it must be a trail byte;
    // decrement current 2 bytes to lead byte
    if(IsLeadByte(*pTemp))
    {
	m_pCurrent -= 2;
	pCh = m_pCurrent;
	uLen = 2;
	return pCh;
    }

    // otherwise, step back unil a non-lead byte is found
    while(m_pCurrent <= --pTemp && IsLeadByte(*pTemp))
    {
	;
    }

    // now pTemp + 1 must point to the beginning of a character,
    // so figure out whether we went back to an even or an odd
    // number of bytes and go back 1 or 2 bytes, respectively.
    m_pCurrent = m_pCurrent - 1 - ((m_pCurrent - pTemp) & 1);

    pCh = m_pCurrent;
    if(IsLeadByte(*pCh))
    {
	uLen = 2;
    }
    else
    {
	uLen = 1;
    }
    return pCh;
}

BYTE*
CHXXMLEncode::SetCurrent(BYTE* pCh)
{
    // no checking other than boundary;
    // if it is set on the trail byte
    // of a DBCS character, bad things
    // will happen...
    HX_ASSERT(pCh >= m_pBuffer &&
	      pCh <= m_pBuffer + m_ulBufferLength);
    m_pCurrent = pCh;
    return m_pCurrent;
}

UINT32
CHXXMLEncode::CharCount()
{
    UINT32 ulLength = 0;
    BYTE* pCh = m_pBuffer;

    if(XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	UINT16 uLen = 0;
	for(; *pCh; pCh = GetNextChar(uLen))
	{
	    ++ulLength;
	}
    }
    else
    {
	for(; *pCh; pCh++)
	{
	    ++ulLength;
	}
    }
    return ulLength;
}

INT32
CHXXMLEncode::GetEncodingIndex(const char* pEncoding)
{
    INT32 lIndex = 0;	// default
    for(INT32 lCount = 0; 
	lCount < sizeof(XMLEncodingInfo) / sizeof(XMLEncodingInfo[0]);
	++lCount)
    {
	if(strcasecmp(pEncoding, XMLEncodingInfo[lCount].m_pIANAName) == 0)
	{
	    lIndex = lCount;
	    break;
	}
    }
    return lIndex;
}

BOOL
CHXXMLEncode::IsRefValid(const BYTE* p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsRefValid(p, len);
    }
    else
    {
	// TODO: Double byte Validation
	return TRUE;
    }
}

BOOL
CHXXMLEncode::IsNameValid(const BYTE* p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsNameValid(p, len);
    }
    else
    {
	// TODO: Double byte Validation.
	return TRUE;
    }
}

BOOL
CHXXMLEncode::IsNmtokenValid(const BYTE*p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsNmtokenValid(p, len);
    }
    else
    {
	// TODO: Double byte Validation.
	return TRUE;
    }
}

BOOL
CHXXMLEncode::IsEntityValueValid(const BYTE* p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsEntityValueValid(p, len);
    }
    else
    {
	return TRUE;
    }
}

BOOL 
CHXXMLEncode::IsAttValueValid(const BYTE* p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsAttValueValid(p, len);
    }
    else
    {
	// TODO: Double byte Validation.
	return TRUE;
    }
}

BOOL 
CHXXMLEncode::IsSystemLiteralValid(const BYTE* p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsSystemLiteralValid(p, len);
    }
    else
    {
	// TODO: Double byte Validation.
	return TRUE;
    }
}

BOOL
CHXXMLEncode::IsPubidLiteralValid(const BYTE* p, UINT32 len)
{
    if (!XMLEncodingInfo[m_lEncodingIndex].m_bDoubleByte)
    {
	return ISO8859Valid::IsPubidLiteralValid(p, len);
    }
    else
    {
	// TODO: Double byte Validation.
	return TRUE;
    }
}