gecko/intl/uconv/ucvcn/nsUnicodeToHZ.cpp

160 lines
5.0 KiB
C++

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/**
* A character set converter from Unicode to HZ.
*
*
* @created 08/Sept/1999
* @author Yueheng Xu, Yueheng.Xu@intel.com
* Revision History
* 04/Oct/1999. Yueheng Xu: Fixed line continuation problem when line
* ended by '~';
* Used table UnicodeToGBK[] to speed up the mapping.
*/
#include "nsUnicodeToHZ.h"
#include "nsUCvCnDll.h"
#include "gbku.h"
//----------------------------------------------------------------------
// Class nsUnicodeToGBK [implementation]
#define HZ_STATE_GB 1
#define HZ_STATE_ASCII 2
#define HZ_STATE_TILD 3
#define HZLEAD1 '~'
#define HZLEAD2 '{'
#define HZLEAD3 '}'
#define UNICODE_TILD 0x007E
nsUnicodeToHZ::nsUnicodeToHZ() : nsEncoderSupport(6)
{
mUtil.InitToGBKTable();
mHZState = HZ_STATE_ASCII; // per HZ spec, default to HZ mode
}
NS_IMETHODIMP nsUnicodeToHZ::ConvertNoBuff(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
PRInt32 i=0;
PRInt32 iSrcLength = *aSrcLength;
PRInt32 iDestLength = 0;
for (i=0;i< iSrcLength;i++)
{
if(! IS_ASCII(*aSrc))
{
// hi byte has something, it is not ASCII, process as a GB
if ( mHZState != HZ_STATE_GB )
{
// we are adding a '~{' ESC sequence to star a HZ string
mHZState = HZ_STATE_GB;
aDest[0] = '~';
aDest[1] = '{';
aDest += 2; // increment 2 bytes
iDestLength +=2;
}
if(mUtil.UnicodeToGBKChar(*aSrc, PR_TRUE, &aDest[0], &aDest[1])) {
aDest += 2; // increment 2 bytes
iDestLength +=2;
} else {
// some thing that we cannot convert
// xxx fix me ftang
// error handling here
}
} else {
// this is an ASCII
// if we are in HZ mode, end it by adding a '~}' ESC sequence
if ( mHZState == HZ_STATE_GB )
{
mHZState = HZ_STATE_ASCII;
aDest[0] = '~';
aDest[1] = '}';
aDest += 2; // increment 2 bytes
iDestLength +=2;
}
// if this is a regular char '~' , convert it to two '~'
if ( *aSrc == UNICODE_TILD )
{
aDest[0] = '~';
aDest[1] = '~';
aDest += 2; // increment 2 bytes
iDestLength +=2;
} else {
// other regular ASCII chars convert by normal ways
// Is this works for both little endian and big endian machines ?
*aDest = (char) ( (PRUnichar)(*aSrc) );
aDest++; // increment 1 byte
iDestLength +=1;
}
}
aSrc++; // increment 2 bytes
if ( iDestLength >= (*aDestLength) )
{
break;
}
}
*aDestLength = iDestLength;
*aSrcLength = i;
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToHZ::FinishNoBuff(char * aDest, PRInt32 * aDestLength)
{
if ( mHZState == HZ_STATE_GB )
{
// if we are in HZ mode, end it by adding a '~}' ESC sequence
mHZState = HZ_STATE_ASCII;
aDest[0] = '~';
aDest[1] = '}';
*aDestLength = 2;
} else {
*aDestLength = 0;
}
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToHZ::FillInfo(PRUint32 *aInfo)
{
mUtil.FillGB2312Info(aInfo);
//GB2312 font lib also have single byte ASCII characters, set them here
for ( PRUint16 u = 0x0000; u <= 0x007F; u++)
SET_REPRESENTABLE(aInfo, u);
return NS_OK;
}