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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* A character set converter from Unicode to GBK.
*
*
* @created 08/Sept/1999
* @author Yueheng Xu, Yueheng.Xu@intel.com
* Revision History
* 04/Oct/1999. Yueheng Xu: used table gUnicodeToGBKTable[0x5200] to make
* Unicode to GB mapping fast
*/
#include "nsUnicodeToGBK.h"
#include "gbku.h"
#include "uconvutil.h"
#include "nsCharTraits.h"
#include "nsUnicodeEncodeHelper.h"
//-------------------------------------------------------------
// Global table initialization function defined in gbku.h
//-------------------------------------------------------------
static const uint16_t g_uf_gb18030_2bytes[] = {
#include "gb18030uniq2b.uf"
};
static const uint16_t g_uf_gb18030_4bytes[] = {
#include "gb180304bytes.uf"
};
static const uint16_t g_uf_gbk[] = {
#include "gbkuniq.uf"
};
//-----------------------------------------------------------------------
// nsUnicodeToGB18030
//-----------------------------------------------------------------------
nsresult nsUnicodeToGB18030::TryExtensionEncoder(char16_t aChar,
char* aOut,
int32_t *aOutLen)
{
int32_t len = 1;
return nsUnicodeEncodeHelper::ConvertByTable(
&aChar, &len, aOut, aOutLen, u2BytesCharset, nullptr,
(uMappingTable*) &g_uf_gb18030_2bytes);
}
nsresult nsUnicodeToGB18030::Try4BytesEncoder(char16_t aChar,
char* aOut,
int32_t *aOutLen)
{
int32_t len = 1;
nsresult res = nsUnicodeEncodeHelper::ConvertByTable(
&aChar, &len, aOut, aOutLen, u4BytesGB18030Charset, nullptr,
(uMappingTable*) &g_uf_gb18030_4bytes);
MOZ_ASSERT((res != NS_OK) || ((1 == len) && (4 == *aOutLen)),
"unexpect conversion length");
return res;
}
nsresult nsUnicodeToGB18030::EncodeSurrogate(char16_t aSurrogateHigh,
char16_t aSurrogateLow,
char* aOut,
int32_t aDestLength,
int32_t aBufferLength)
{
if( NS_IS_HIGH_SURROGATE(aSurrogateHigh) &&
NS_IS_LOW_SURROGATE(aSurrogateLow) )
{
// notice that idx does not include the 0x10000
uint32_t idx = ((aSurrogateHigh - (char16_t)0xD800) << 10 ) |
(aSurrogateLow - (char16_t) 0xDC00);
if (aDestLength + 4 > aBufferLength) {
return NS_OK_UENC_MOREOUTPUT;
}
unsigned char *out = (unsigned char*) aOut;
// notice this is from 0x90 for supplementary planes
out[0] = (idx / (10*126*10)) + 0x90;
idx %= (10*126*10);
out[1] = (idx / (10*126)) + 0x30;
idx %= (10*126);
out[2] = (idx / (10)) + 0x81;
out[3] = (idx % 10) + 0x30;
return NS_OK;
}
return NS_ERROR_UENC_NOMAPPING;
}
//----------------------------------------------------------------------
// Class nsUnicodeToGBK [implementation]
nsUnicodeToGBK::nsUnicodeToGBK(uint32_t aMaxLength) :
nsEncoderSupport(aMaxLength), mSurrogateHigh(0)
{
}
nsresult nsUnicodeToGBK::TryExtensionEncoder(char16_t aChar,
char* aOut,
int32_t *aOutLen)
{
int32_t len = 1;
return nsUnicodeEncodeHelper::ConvertByTable(
&aChar, &len, aOut, aOutLen, u1ByteCharset, nullptr,
(uMappingTable*) &g_uf_gbk);
}
nsresult nsUnicodeToGBK::Try4BytesEncoder(char16_t aChar,
char* aOut,
int32_t *aOutLen)
{
return NS_ERROR_UENC_NOMAPPING;
}
nsresult nsUnicodeToGBK::EncodeSurrogate(char16_t aSurrogateHigh,
char16_t aSurrogateLow,
char* aOut,
int32_t aDestLength,
int32_t aBufferLength)
{
return NS_ERROR_UENC_NOMAPPING; // GBK cannot encode Surrogate, let the subclass encode it.
}
NS_IMETHODIMP nsUnicodeToGBK::ConvertNoBuffNoErr(const char16_t * aSrc,
int32_t * aSrcLength,
char * aDest,
int32_t * aDestLength)
{
int32_t iSrcLength = 0;
int32_t iDestLength = 0;
char16_t unicode;
nsresult res = NS_OK;
while (iSrcLength < *aSrcLength )
{
unicode = *aSrc;
//if unicode's hi byte has something, it is not ASCII, must be a GB
if (IS_ASCII(unicode)) {
// make sure we still have 1 byte for output first
if (iDestLength >= *aDestLength) {
res = NS_OK_UENC_MOREOUTPUT;
break;
}
// this is an ASCII
*aDest = CAST_UNICHAR_TO_CHAR(*aSrc);
aDest++; // increment 1 byte
iDestLength +=1;
} else {
char byte1, byte2;
if(mUtil.UnicodeToGBKChar( unicode, false, &byte1, &byte2))
{
// make sure we still have 2 bytes for output first
if(iDestLength+2 > *aDestLength)
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
aDest[0] = byte1;
aDest[1] = byte2;
aDest += 2; // increment 2 bytes
iDestLength +=2;
} else {
// Swapped character in GB18030-2005
if (unicode == 0xE7C7) {
unicode = 0x1E3F;
}
// we cannot map in the common mapping. Let's try to
// call the delegated 2 byte converter for the gbk or gb18030
// unique 2 byte mapping
int32_t outLen = *aDestLength - iDestLength;
if (NS_IS_HIGH_SURROGATE(unicode) ||
NS_IS_LOW_SURROGATE(unicode)) {
// performance tune for surrogate characters
res = NS_ERROR_UENC_NOMAPPING;
} else {
res = TryExtensionEncoder(unicode, aDest, &outLen);
}
if (res == NS_OK) {
iDestLength += outLen;
aDest += outLen;
} else if (res == NS_OK_UENC_MOREOUTPUT) {
break;
} else {
// we still cannot map. Let's try to
// call the delegated GB18030 4 byte converter
if( NS_IS_HIGH_SURROGATE(unicode) )
{
if((iSrcLength+1) < *aSrcLength ) {
res = EncodeSurrogate(aSrc[0],aSrc[1], aDest,
iDestLength, *aDestLength);
if (res == NS_OK) {
// since we got a surrogate pair, we need to increment src.
iSrcLength++ ;
aSrc++;
iDestLength += 4;
aDest += 4;
} else {
if (res == NS_ERROR_UENC_NOMAPPING) {
// only get a high surrogate, but not a low surrogate
iSrcLength++; // include length of the unmapped character
}
break;
}
} else {
mSurrogateHigh = aSrc[0];
res = NS_OK;
break; // this will go to afterwhileloop
}
} else {
if( NS_IS_LOW_SURROGATE(unicode) )
{
if(NS_IS_HIGH_SURROGATE(mSurrogateHigh)) {
res = EncodeSurrogate(mSurrogateHigh, aSrc[0], aDest,
iDestLength, *aDestLength);
if (res == NS_OK) {
iDestLength += 4;
aDest += 4;
} else {
if (res == NS_ERROR_UENC_NOMAPPING) {
// only get a high surrogate, but not a low surrogate
iSrcLength++; // include length of the unmapped character
}
break;
}
} else {
// only get a low surrogate, but not a low surrogate
res = NS_ERROR_UENC_NOMAPPING;
iSrcLength++; // include length of the unmapped character
break;
}
} else {
outLen = *aDestLength - iDestLength;
res = Try4BytesEncoder(unicode, aDest, &outLen);
if (res == NS_OK) {
iDestLength += outLen;
aDest += outLen;
} else {
if (res == NS_ERROR_UENC_NOMAPPING) {
iSrcLength++; // include length of the unmapped character
}
break;
}
}
}
}
}
}
iSrcLength++ ; // Each unicode char just count as one in char16_t string;
mSurrogateHigh = 0;
aSrc++;
}
//afterwhileloop:
*aDestLength = iDestLength;
*aSrcLength = iSrcLength;
return res;
}
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