gecko-dev/lib/libi18n/uscan.c

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1998-03-28 02:44:41 +00:00
/* -*- 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "intlpriv.h"
#include "ugen.h"
#include "xp.h"
/*=================================================================================
=================================================================================*/
typedef XP_Bool (*uSubScannerFunc) (unsigned char* in, uint16* out);
/*=================================================================================
=================================================================================*/
typedef XP_Bool (*uScannerFunc) (
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
MODULE_PRIVATE XP_Bool uScan(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
#define uSubScanner(sub,in,out) (* m_subscanner[sub])((in),(out))
PRIVATE XP_Bool uCheckAndScanAlways1Byte(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
PRIVATE XP_Bool uCheckAndScanAlways2Byte(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
PRIVATE XP_Bool uCheckAndScanAlways2ByteShiftGR(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
PRIVATE XP_Bool uCheckAndScanByTable(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
PRIVATE XP_Bool uCheckAndScan2ByteGRPrefix8F(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
PRIVATE XP_Bool uCheckAndScan2ByteGRPrefix8EA2(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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);
PRIVATE XP_Bool uScanAlways2Byte(
unsigned char* in,
uint16* out
);
PRIVATE XP_Bool uScanAlways2ByteShiftGR(
unsigned char* in,
uint16* out
);
PRIVATE XP_Bool uScanAlways1Byte(
unsigned char* in,
uint16* out
);
PRIVATE XP_Bool uScanAlways1BytePrefix8E(
unsigned char* in,
uint16* out
);
PRIVATE XP_Bool uScanAlways2ByteUTF8(
unsigned char* in,
uint16* out
);
PRIVATE XP_Bool uScanAlways3ByteUTF8(
unsigned char* in,
uint16* out
);
/*=================================================================================
=================================================================================*/
PRIVATE uScannerFunc m_scanner[uNumOfCharsetType] =
{
uCheckAndScanAlways1Byte,
uCheckAndScanAlways2Byte,
uCheckAndScanByTable,
uCheckAndScanAlways2ByteShiftGR,
uCheckAndScan2ByteGRPrefix8F,
uCheckAndScan2ByteGRPrefix8EA2,
};
/*=================================================================================
=================================================================================*/
PRIVATE uSubScannerFunc m_subscanner[uNumOfCharType] =
{
uScanAlways1Byte,
uScanAlways2Byte,
uScanAlways2ByteShiftGR,
uScanAlways1BytePrefix8E,
uScanAlways2ByteUTF8,
uScanAlways3ByteUTF8
};
/*=================================================================================
=================================================================================*/
MODULE_PRIVATE XP_Bool uScan(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
return (* m_scanner[shift->classID]) (shift,state,in,out,inbuflen,inscanlen);
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uScanAlways1Byte(
unsigned char* in,
uint16* out
)
{
*out = (uint16) in[0];
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uScanAlways2Byte(
unsigned char* in,
uint16* out
)
{
*out = (uint16) (( in[0] << 8) | (in[1]));
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uScanAlways2ByteShiftGR(
unsigned char* in,
uint16* out
)
{
*out = (uint16) ((( in[0] << 8) | (in[1])) & 0x7F7F);
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uScanAlways1BytePrefix8E(
unsigned char* in,
uint16* out
)
{
*out = (uint16) in[1];
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uScanAlways2ByteUTF8(
unsigned char* in,
uint16* out
)
{
*out = (uint16) (((in[0] & 0x001F) << 6 )| (in[1] & 0x003F));
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uScanAlways3ByteUTF8(
unsigned char* in,
uint16* out
)
{
*out = (uint16) (((in[0] & 0x000F) << 12 ) | ((in[1] & 0x003F) << 6)
| (in[2] & 0x003F));
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uCheckAndScanAlways1Byte(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
/* Don't check inlen. The caller should ensure it is larger than 0 */
*inscanlen = 1;
*out = (uint16) in[0];
return TRUE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uCheckAndScanAlways2Byte(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
if(inbuflen < 2)
return FALSE;
else
{
*inscanlen = 2;
*out = ((in[0] << 8) | ( in[1])) ;
return TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uCheckAndScanAlways2ByteShiftGR(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
if(inbuflen < 2)
return FALSE;
else
{
*inscanlen = 2;
*out = (((in[0] << 8) | ( in[1])) & 0x7F7F);
return TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uCheckAndScanByTable(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
int16 i;
uShiftCell* cell = &(shift->shiftcell[0]);
int16 itemnum = shift->numOfItem;
for(i=0;i<itemnum;i++)
{
if( ( in[0] >= cell[i].shiftin.Min) &&
( in[0] <= cell[i].shiftin.Max))
{
if(inbuflen < cell[i].reserveLen)
return FALSE;
else
{
*inscanlen = cell[i].reserveLen;
return (uSubScanner(cell[i].classID,in,out));
}
}
}
return FALSE;
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uCheckAndScan2ByteGRPrefix8F(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
if((inbuflen < 3) ||(in[0] != 0x8F))
return FALSE;
else
{
*inscanlen = 3;
*out = (((in[1] << 8) | ( in[2])) & 0x7F7F);
return TRUE;
}
}
/*=================================================================================
=================================================================================*/
PRIVATE XP_Bool uCheckAndScan2ByteGRPrefix8EA2(
uShiftTable *shift,
int32* state,
unsigned char *in,
uint16 *out,
uint32 inbuflen,
uint32* inscanlen
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)
{
if((inbuflen < 4) || (in[0] != 0x8E) || (in[1] != 0xA2))
return FALSE;
else
{
*inscanlen = 4;
*out = (((in[2] << 8) | ( in[3])) & 0x7F7F);
return TRUE;
}
}