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112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/*
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Intel
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* Corporation. Portions created by Intel are
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* Copyright (C) 1999 Intel Corporation. All
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* Rights Reserved.
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*
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* Contributor(s): Yueheng Xu <yueheng.xu@intel.com>
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* Hoa Nguyen <hoa.nguyen@intel.com>
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*/
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// =======================================================================
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// Original Author: Yueheng Xu
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// email: yueheng.xu@intel.com
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// phone: (503)264-2248
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// Intel Corporation, Oregon, USA
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// Last Update: September 7, 1999
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// Revision History:
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// 09/07/1999 - initial version.
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// 09/28/1999 - changed leftbyte and rightbyte from char to unsigned char
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// in struct DByte
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// 04/10/1999 - changed leftbyte. rightbyte to PRUint8 in struct DByte;
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// added table UnicodeToGBKTable[0x5200]
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//
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// 05/16/2000 - added gUnicodeToGBKTableInitialized flag for optimization
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// ======================================================================================
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// Table GBKToUnicode[] maps the GBK code to its unicode.
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// The mapping data of this GBK table is obtained from
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// ftp://ftp.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP936.TXT
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// Frank Tang of Netscape wrote the original perl tool to re-align the
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// mapping data into an 8-item per line format ( i.e. file cp936map.txt ).
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//
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// The valid GBK charset range: left byte is [0x81, 0xfe], right byte are
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// [0x40, 0x7e] and [0x80, 0xfe]. But for the convenience of index
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// calculation, the table here has a single consecutive range of
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// [0x40, 0xfe] for the right byte. Those invalid chars whose right byte
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// is 0x7f will be mapped to undefined unicode 0xFFFF.
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//
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//
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// Table UnicodeToGBK[] maps the unicode to GBK code. To reduce memory usage, we
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// only do Unicode to GBK table mapping for unicode between 0x4E00 and 0xA000;
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// Others let converter to do search from table GBKToUnicode[]. If we want further
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// trade memory for performance, we can let more unicode to do table mapping to get
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// its GBK instead of searching table GBKToUnicode[].
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#ifdef _GBKU_TABLE_
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#define GB_UNDEFINED 0xFFFF
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#define MAX_GBK_LENGTH 24066 /* (0xfe-0x80)*(0xfe-0x3f) */
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typedef struct
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{
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PRUint8 leftbyte;
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PRUint8 rightbyte;
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} DByte;
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extern PRUnichar GBKToUnicodeTable[MAX_GBK_LENGTH];
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#ifdef _UNICODE_TO_GBK_ENCODER_
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DByte UnicodeToGBKTable[0x5200];
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PRUint16 gUnicodeToGBKTableInitialized = PR_FALSE; // default to not initialized yet
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#else
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extern DByte UnicodeToGBKTable[0x5200]; // 0xA000 - 0x4E00 = 0x5200
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extern PRUint16 gUnicodeToGBKTableInitialized;
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#endif
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#else
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#define _GBKU_TABLE_
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#define GB_UNDEFINED 0xFFFF
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#define MAX_GBK_LENGTH 24066 /* (0xfe-0x80)*(0xfe-0x3f) */
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typedef struct
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{
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PRUint8 leftbyte;
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PRUint8 rightbyte;
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} DByte;
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PRUnichar GBKToUnicodeTable[MAX_GBK_LENGTH] =
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{
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#include "cp936map.h"
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};
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#ifdef _UNICODE_TO_GBK_ENCODER_
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DByte UnicodeToGBKTable[0x5200];
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PRUint16 gUnicodeToGBKTableInitialized = PR_FALSE; // default to not initialized yet
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#else
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extern DByte UnicodeToGBKTable[0x5200]; // 0xA000 - 0x4E00 = 0x5200
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extern PRUint16 gUnicodeToGBKTableInitialized;
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#endif
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#endif /* ifdef _GBKU_TABLE_ */
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