diff options
Diffstat (limited to 'intl/uconv/ucvcn/nsUnicodeToGBK.cpp')
| -rw-r--r-- | intl/uconv/ucvcn/nsUnicodeToGBK.cpp | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/intl/uconv/ucvcn/nsUnicodeToGBK.cpp b/intl/uconv/ucvcn/nsUnicodeToGBK.cpp new file mode 100644 index 000000000..f37fefb43 --- /dev/null +++ b/intl/uconv/ucvcn/nsUnicodeToGBK.cpp @@ -0,0 +1,256 @@ +/* -*- 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; +} |