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099b876d99
gecko-dev/intl/uconv/util/ugen.c
yokoyama%netscape.com 099b876d99 Bug 88944 for jshin. r=ftang sr=blizzard@mozilla.org 
adding converter support for x-windows-949 and x-johab
2006-05-17 02:33:30 +00:00

971 lines
39 KiB
C
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "unicpriv.h"
/*=================================================================================
=================================================================================*/
typedef PRBool (*uSubGeneratorFunc) (PRUint16 in, unsigned char* out);
/*=================================================================================
=================================================================================*/
typedef PRBool (*uGeneratorFunc) (
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
MODULE_PRIVATE PRBool uGenerate(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
#define uSubGennerator(sub,in,out) (* m_subgenerator[sub])((in),(out))
PRIVATE PRBool uCheckAndGenAlways1Byte(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenAlways2Byte(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenAlways2ByteShiftGR(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenByTable(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8F(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA2(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenAlways2ByteSwap(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenAlways4Byte(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenAlways4ByteSwap(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA3(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA4(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA5(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA6(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA7(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenAlways1ByteShiftGL(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCnGAlways8BytesDecomposedHangul(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCnGAlways6BytesGLDecomposedHangul(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenJohabHangul(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGenJohabSymbol(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uCheckAndGen4BytesGB18030(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
);
PRIVATE PRBool uGenDecomposedHangulCommon(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen,
PRUint8 mask,
PRUint16 nbyte
);
PRIVATE PRBool uGenAlways2Byte(
PRUint16 in,
unsigned char* out
);
PRIVATE PRBool uGenAlways2ByteShiftGR(
PRUint16 in,
unsigned char* out
);
PRIVATE PRBool uGenAlways1Byte(
PRUint16 in,
unsigned char* out
);
PRIVATE PRBool uGenAlways1BytePrefix8E(
PRUint16 in,
unsigned char* out
);
PRIVATE PRBool uGenAlways2ByteUTF8(
PRUint16 in,
unsigned char* out
);
PRIVATE PRBool uGenAlways3ByteUTF8(
PRUint16 in,
unsigned char* out
);
/*=================================================================================
=================================================================================*/
PRIVATE uGeneratorFunc m_generator[uNumOfCharsetType] =
{
uCheckAndGenAlways1Byte,
uCheckAndGenAlways2Byte,
uCheckAndGenByTable,
uCheckAndGenAlways2ByteShiftGR,
uCheckAndGen2ByteGRPrefix8F,
uCheckAndGen2ByteGRPrefix8EA2,
uCheckAndGenAlways2ByteSwap,
uCheckAndGenAlways4Byte,
uCheckAndGenAlways4ByteSwap,
uCheckAndGen2ByteGRPrefix8EA3,
uCheckAndGen2ByteGRPrefix8EA4,
uCheckAndGen2ByteGRPrefix8EA5,
uCheckAndGen2ByteGRPrefix8EA6,
uCheckAndGen2ByteGRPrefix8EA7,
uCheckAndGenAlways1ByteShiftGL,
uCnGAlways8BytesDecomposedHangul,
uCnGAlways6BytesGLDecomposedHangul,
uCheckAndGenJohabHangul,
uCheckAndGenJohabSymbol,
uCheckAndGen4BytesGB18030,
uCheckAndGenAlways2Byte /* place-holder for GR128 */
};
/*=================================================================================
=================================================================================*/
PRIVATE uSubGeneratorFunc m_subgenerator[uNumOfCharType] =
{
uGenAlways1Byte,
uGenAlways2Byte,
uGenAlways2ByteShiftGR,
uGenAlways1BytePrefix8E,
uGenAlways2ByteUTF8,
uGenAlways3ByteUTF8
};
/*=================================================================================
=================================================================================*/
MODULE_PRIVATE PRBool uGenerate(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
return (* m_generator[shift->classID]) (shift,state,in,out,outbuflen,outlen);
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenAlways1Byte(
PRUint16 in,
unsigned char* out
)
{
out[0] = (unsigned char)in;
return PR_TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenAlways2Byte(
PRUint16 in,
unsigned char* out
)
{
out[0] = (unsigned char)((in >> 8) & 0xff);
out[1] = (unsigned char)(in & 0xff);
return PR_TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenAlways2ByteShiftGR(
PRUint16 in,
unsigned char* out
)
{
out[0] = (unsigned char)(((in >> 8) & 0xff) | 0x80);
out[1] = (unsigned char)((in & 0xff) | 0x80);
return PR_TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenAlways1BytePrefix8E(
PRUint16 in,
unsigned char* out
)
{
out[0] = 0x8E;
out[1] = (unsigned char)(in & 0xff);
return PR_TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenAlways2ByteUTF8(
PRUint16 in,
unsigned char* out
)
{
out[0] = (unsigned char)(0xC0 | (( in >> 6 ) & 0x1F));
out[1] = (unsigned char)(0x80 | (( in ) & 0x3F));
return PR_TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenAlways3ByteUTF8(
PRUint16 in,
unsigned char* out
)
{
out[0] = (unsigned char)(0xE0 | (( in >> 12 ) & 0x0F));
out[1] = (unsigned char)(0x80 | (( in >> 6 ) & 0x3F));
out[2] = (unsigned char)(0x80 | (( in ) & 0x3F));
return PR_TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways1Byte(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
/* Don't check inlen. The caller should ensure it is larger than 0 */
/* Oops, I don't agree. Code changed to check every time. [CATA] */
if(outbuflen < 1)
return PR_FALSE;
else
{
*outlen = 1;
out[0] = in & 0xff;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways2Byte(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 2)
return PR_FALSE;
else
{
*outlen = 2;
out[0] = ((in >> 8 ) & 0xff);
out[1] = in & 0xff;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways2ByteShiftGR(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 2)
return PR_FALSE;
else
{
*outlen = 2;
out[0] = ((in >> 8 ) & 0xff) | 0x80;
out[1] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenByTable(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
PRInt16 i;
uShiftCell* cell = &(shift->shiftcell[0]);
PRInt16 itemnum = shift->numOfItem;
unsigned char inH, inL;
inH = (in >> 8) & 0xff;
inL = (in & 0xff );
for(i=0;i<itemnum;i++)
{
if( ( inL >= cell[i].shiftout.MinLB) &&
( inL <= cell[i].shiftout.MaxLB) &&
( inH >= cell[i].shiftout.MinHB) &&
( inH <= cell[i].shiftout.MaxHB) )
{
if(outbuflen < cell[i].reserveLen)
return PR_FALSE;
else
{
*outlen = cell[i].reserveLen;
return (uSubGennerator(cell[i].classID,in,out));
}
}
}
return PR_FALSE;
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8F( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 3)
return PR_FALSE;
else
{
*outlen = 3;
out[0] = 0x8F;
out[1] = ((in >> 8 ) & 0xff) | 0x80;
out[2] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA2( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = 0x8E;
out[1] = 0xA2;
out[2] = ((in >> 8 ) & 0xff) | 0x80;
out[3] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways2ByteSwap(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 2)
return PR_FALSE;
else
{
*outlen = 2;
out[0] = in & 0xff;
out[1] = ((in >> 8 ) & 0xff);
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways4Byte(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = out[1] = 0x00;
out[2] = ((in >> 8 ) & 0xff);
out[3] = in & 0xff;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways4ByteSwap(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = ((in >> 8 ) & 0xff);
out[1] = in & 0xff;
out[2] = out[3] = 0x00;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA3( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = 0x8E;
out[1] = 0xA3;
out[2] = ((in >> 8 ) & 0xff) | 0x80;
out[3] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA4( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = 0x8E;
out[1] = 0xA4;
out[2] = ((in >> 8 ) & 0xff) | 0x80;
out[3] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA5( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = 0x8E;
out[1] = 0xA5;
out[2] = ((in >> 8 ) & 0xff) | 0x80;
out[3] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA6( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = 0x8E;
out[1] = 0xA6;
out[2] = ((in >> 8 ) & 0xff) | 0x80;
out[3] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGen2ByteGRPrefix8EA7( uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
else
{
*outlen = 4;
out[0] = 0x8E;
out[1] = 0xA7;
out[2] = ((in >> 8 ) & 0xff) | 0x80;
out[3] = (in & 0xff) | 0x80;
return PR_TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uCheckAndGenAlways1ByteShiftGL(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
/* Don't check inlen. The caller should ensure it is larger than 0 */
/* Oops, I don't agree. Code changed to check every time. [CATA] */
if(outbuflen < 1)
return PR_FALSE;
else
{
*outlen = 1;
out[0] = in & 0x7f;
return PR_TRUE;
}
}
#define SBase 0xAC00
#define LCount 19
#define VCount 21
#define TCount 28
#define NCount (VCount * TCount)
/*=================================================================================
=================================================================================*/
PRIVATE PRBool uGenDecomposedHangulCommon(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen,
PRUint8 mask,
PRUint16 nbyte
)
{
if(outbuflen < 8)
return PR_FALSE;
else
{
static PRUint8 lMap[LCount] = {
0xa1, 0xa2, 0xa4, 0xa7, 0xa8, 0xa9, 0xb1, 0xb2, 0xb3, 0xb5,
0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe
};
static PRUint8 tMap[TCount] = {
0xd4, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa9, 0xaa,
0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb4, 0xb5,
0xb6, 0xb7, 0xb8, 0xba, 0xbb, 0xbc, 0xbd, 0xbe
};
PRUint16 SIndex, LIndex, VIndex, TIndex;
PRUint16 offset;
/* the following line are copy from Unicode 2.0 page 3-13 */
/* item 1 of Hangul Syllabel Decomposition */
SIndex = in - SBase;
/* the following lines are copy from Unicode 2.0 page 3-14 */
/* item 2 of Hangul Syllabel Decomposition w/ modification */
LIndex = SIndex / NCount;
VIndex = (SIndex % NCount) / TCount;
TIndex = SIndex % TCount;
*outlen = nbyte;
offset = nbyte == 6 ? 0 : 2;
out[0] = out[2] = out[4] = 0xa4 & mask;
out[1+offset] = lMap[LIndex] & mask;
out[3+offset] = (VIndex + 0xbf) & mask;
out[5+offset] = tMap[TIndex] & mask;
if ( nbyte == 8 )
{
out[6] = 0xa4 & mask;
out[1] = 0xd4 & mask;
}
return PR_TRUE;
}
}
PRIVATE PRBool uCnGAlways8BytesDecomposedHangul(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
return uGenDecomposedHangulCommon(shift,state,in,out,outbuflen,outlen,0xff,8);
}
/*
For rendering of Hangul in X11 with fonts with glyphs for only
2350 syllables, drop the first 2bytes anchoring the representation
of Hangul syllables with 8byte sequence.
*/
PRIVATE PRBool uCnGAlways6BytesGLDecomposedHangul(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
return uGenDecomposedHangulCommon(shift,state,in,out,outbuflen,outlen,0x7f,6);
}
PRIVATE PRBool uCheckAndGenJohabHangul(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 2)
return PR_FALSE;
else
{
/*
See Table 4-45 (page 183) of CJKV Information Processing
for detail explaination of the following table
*/
/*
static PRUint8 lMap[LCount] = {
2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
};
Therefore lMap[i] == i+2;
*/
static PRUint8 vMap[VCount] = {
/* no 0,1,2 */
3,4,5,6,7, /* no 8,9 */
10,11,12,13,14,15, /* no 16,17 */
18,19,20,21,22,23, /* no 24,25 */
26,27,28,29
};
static PRUint8 tMap[TCount] = {
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17, /* no 18 */
19,20,21,22,23,24,25,26,27,28,29
};
PRUint16 SIndex, LIndex, VIndex, TIndex, ch;
/* the following line are copy from Unicode 2.0 page 3-13 */
/* item 1 of Hangul Syllabel Decomposition */
SIndex = in - SBase;
/* the following lines are copy from Unicode 2.0 page 3-14 */
/* item 2 of Hangul Syllabel Decomposition w/ modification */
LIndex = SIndex / NCount;
VIndex = (SIndex % NCount) / TCount;
TIndex = SIndex % TCount;
*outlen = 2;
ch = 0x8000 |
((LIndex+2)<<10) |
(vMap[VIndex]<<5)|
tMap[TIndex];
out[0] = (ch >> 8);
out[1] = ch & 0x00FF;
#if 0
printf("Johab Hangul %x %x in=%x L=%d V=%d T=%d\n", out[0], out[1], in, LIndex, VIndex, TIndex);
#endif
return PR_TRUE;
}
}
PRIVATE PRBool uCheckAndGenJohabSymbol(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 2)
return PR_FALSE;
else
{
/* The following code are based on the Perl code listed under
* "ISO-2022-KR or EUC-KR to Johab Conversion" (page 1013)
* in the book "CJKV Information Processing" by
* Ken Lunde <lunde@adobe.com>
*
* sub convert2johab($) { # Convert ISO-2022-KR or EUC-KR to Johab
* my @euc = unpack("C*", $_[0]);
* my ($fe_off, $hi_off, $lo_off) = (0,0,1);
* my @out = ();
* while(($hi, $lo) = splice(@euc, 0, 2)) {
* $hi &= 127; $lo &= 127;
* $fe_off = 21 if $hi == 73;
* $fe_off = 34 if $hi == 126;
* ($hi_off, $lo_off) = ($lo_off, $hi_off) if ($hi <74 or $hi >125);
* push(@out, ((($hi+$hi_off) >> 1)+ ($hi <74 ? 200:187)- $fe_off),
* $lo + ((($hi+$lo_off) & 1) ? ($lo > 110 ? 34:16):128));
* }
* return pack("C*", @out);
*/
unsigned char fe_off = 0;
unsigned char hi_off = 0;
unsigned char lo_off = 1;
unsigned char hi = (in >> 8) & 0x7F;
unsigned char lo = in & 0x7F;
if(73 == hi)
fe_off = 21;
if(126 == hi)
fe_off = 34;
if( (hi < 74) || ( hi > 125) )
{
hi_off = 1;
lo_off = 0;
}
*outlen = 2;
out[0] = ((hi+hi_off) >> 1) + ((hi<74) ? 200 : 187 ) - fe_off;
out[1] = lo + (((hi+lo_off) & 1) ? ((lo > 110) ? 34 : 16) :
128);
#if 0
printf("Johab Symbol %x %x in=%x\n", out[0], out[1], in);
#endif
return PR_TRUE;
}
}
PRIVATE PRBool uCheckAndGen4BytesGB18030(
uShiftTable *shift,
PRInt32* state,
PRUint16 in,
unsigned char* out,
PRUint32 outbuflen,
PRUint32* outlen
)
{
if(outbuflen < 4)
return PR_FALSE;
out[0] = (in / (10*126*10)) + 0x81;
in %= (10*126*10);
out[1] = (in / (10*126)) + 0x30;
in %= (10*126);
out[2] = (in / (10)) + 0x81;
out[3] = (in % 10) + 0x30;
*outlen = 4;
return PR_TRUE;
}
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