/*
**********************************************************************
* Copyright (C) 2000-2007, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* file name: ucnvlat1.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2000feb07
* created by: Markus W. Scherer
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_CONVERSION
#include "unicode/ucnv.h"
#include "unicode/uset.h"
#include "ucnv_bld.h"
#include "ucnv_cnv.h"
/* control optimizations according to the platform */
#define LATIN1_UNROLL_FROM_UNICODE 1
/* ISO 8859-1 --------------------------------------------------------------- */
/* This is a table-less and callback-less version of ucnv_MBCSSingleToBMPWithOffsets(). */
static void
_Latin1ToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
const uint8_t *source;
UChar *target;
int32_t targetCapacity, length;
int32_t *offsets;
int32_t sourceIndex;
/* set up the local pointers */
source=(const uint8_t *)pArgs->source;
target=pArgs->target;
targetCapacity=(int32_t)(pArgs->targetLimit-pArgs->target);
offsets=pArgs->offsets;
sourceIndex=0;
/*
* since the conversion here is 1:1 UChar:uint8_t, we need only one counter
* for the minimum of the sourceLength and targetCapacity
*/
length=(int32_t)((const uint8_t *)pArgs->sourceLimit-source);
if(length<=targetCapacity) {
targetCapacity=length;
} else {
/* target will be full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
length=targetCapacity;
}
if(targetCapacity>=8) {
/* This loop is unrolled for speed and improved pipelining. */
int32_t count, loops;
loops=count=targetCapacity>>3;
length=targetCapacity&=0x7;
do {
target[0]=source[0];
target[1]=source[1];
target[2]=source[2];
target[3]=source[3];
target[4]=source[4];
target[5]=source[5];
target[6]=source[6];
target[7]=source[7];
target+=8;
source+=8;
} while(--count>0);
if(offsets!=NULL) {
do {
offsets[0]=sourceIndex++;
offsets[1]=sourceIndex++;
offsets[2]=sourceIndex++;
offsets[3]=sourceIndex++;
offsets[4]=sourceIndex++;
offsets[5]=sourceIndex++;
offsets[6]=sourceIndex++;
offsets[7]=sourceIndex++;
offsets+=8;
} while(--loops>0);
}
}
/* conversion loop */
while(targetCapacity>0) {
*target++=*source++;
--targetCapacity;
}
/* write back the updated pointers */
pArgs->source=(const char *)source;
pArgs->target=target;
/* set offsets */
if(offsets!=NULL) {
while(length>0) {
*offsets++=sourceIndex++;
--length;
}
pArgs->offsets=offsets;
}
}
/* This is a table-less and callback-less version of ucnv_MBCSSingleGetNextUChar(). */
static UChar32
_Latin1GetNextUChar(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
const uint8_t *source=(const uint8_t *)pArgs->source;
if(source<(const uint8_t *)pArgs->sourceLimit) {
pArgs->source=(const char *)(source+1);
return *source;
}
/* no output because of empty input */
*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
return 0xffff;
}
/* This is a table-less version of ucnv_MBCSSingleFromBMPWithOffsets(). */
static void
_Latin1FromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const UChar *source, *sourceLimit;
uint8_t *target, *oldTarget;
int32_t targetCapacity, length;
int32_t *offsets;
UChar32 cp;
UChar c, max;
int32_t sourceIndex;
/* set up the local pointers */
cnv=pArgs->converter;
source=pArgs->source;
sourceLimit=pArgs->sourceLimit;
target=oldTarget=(uint8_t *)pArgs->target;
targetCapacity=(int32_t)(pArgs->targetLimit-pArgs->target);
offsets=pArgs->offsets;
if(cnv->sharedData==&_Latin1Data) {
max=0xff; /* Latin-1 */
} else {
max=0x7f; /* US-ASCII */
}
/* get the converter state from UConverter */
cp=cnv->fromUChar32;
/* sourceIndex=-1 if the current character began in the previous buffer */
sourceIndex= cp==0 ? 0 : -1;
/*
* since the conversion here is 1:1 UChar:uint8_t, we need only one counter
* for the minimum of the sourceLength and targetCapacity
*/
length=(int32_t)(sourceLimit-source);
if(length<targetCapacity) {
targetCapacity=length;
}
/* conversion loop */
if(cp!=0 && targetCapacity>0) {
goto getTrail;
}
#if LATIN1_UNROLL_FROM_UNICODE
/* unroll the loop with the most common case */
if(targetCapacity>=16) {
int32_t count, loops;
UChar u, oredChars;
loops=count=targetCapacity>>4;
do {
oredChars=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
oredChars|=u=*source++;
*target++=(uint8_t)u;
/* were all 16 entries really valid? */
if(oredChars>max) {
/* no, return to the first of these 16 */
source-=16;
target-=16;
break;
}
} while(--count>0);
count=loops-count;
targetCapacity-=16*count;
if(offsets!=NULL) {
oldTarget+=16*count;
while(count>0) {
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
--count;
}
}
}
#endif
/* conversion loop */
c=0;
while(targetCapacity>0 && (c=*source++)<=max) {
/* convert the Unicode code point */
*target++=(uint8_t)c;
--targetCapacity;
}
if(c>max) {
cp=c;
if(!U_IS_SURROGATE(cp)) {
/* callback(unassigned) */
} else if(U_IS_SURROGATE_LEAD(cp)) {
getTrail:
if(source<sourceLimit) {
/* test the following code unit */
UChar trail=*source;
if(U16_IS_TRAIL(trail)) {
++source;
cp=U16_GET_SUPPLEMENTARY(cp, trail);
/* this codepage does not map supplementary code points */
/* callback(unassigned) */
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
}
} else {
/* no more input */
cnv->fromUChar32=cp;
goto noMoreInput;
}
} else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
}
*pErrorCode= U_IS_SURROGATE(cp) ? U_ILLEGAL_CHAR_FOUND : U_INVALID_CHAR_FOUND;
cnv->fromUChar32=cp;
}
noMoreInput:
/* set offsets since the start */
if(offsets!=NULL) {
size_t count=target-oldTarget;
while(count>0) {
*offsets++=sourceIndex++;
--count;
}
}
if(U_SUCCESS(*pErrorCode) && source<sourceLimit && target>=(uint8_t *)pArgs->targetLimit) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
/* write back the updated pointers */
pArgs->source=source;
pArgs->target=(char *)target;
pArgs->offsets=offsets;
}
/* Convert UTF-8 to Latin-1. Adapted from ucnv_SBCSFromUTF8(). */
static void
ucnv_Latin1FromUTF8(UConverterFromUnicodeArgs *pFromUArgs,
UConverterToUnicodeArgs *pToUArgs,
UErrorCode *pErrorCode) {
UConverter *utf8;
const uint8_t *source, *sourceLimit;
uint8_t *target;
int32_t targetCapacity;
UChar32 c;
uint8_t b, t1;
/* set up the local pointers */
utf8=pToUArgs->converter;
source=(uint8_t *)pToUArgs->source;
sourceLimit=(uint8_t *)pToUArgs->sourceLimit;
target=(uint8_t *)pFromUArgs->target;
targetCapacity=(int32_t)(pFromUArgs->targetLimit-pFromUArgs->target);
/* get the converter state from the UTF-8 UConverter */
c=(UChar32)utf8->toUnicodeStatus;
if(c!=0 && source<sourceLimit) {
if(targetCapacity==0) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
return;
} else if(c>=0xc2 && c<=0xc3 && (t1=(uint8_t)(*source-0x80)) <= 0x3f) {
++source;
*target++=(uint8_t)(((c&3)<<6)|t1);
--targetCapacity;
utf8->toUnicodeStatus=0;
utf8->toULength=0;
} else {
/* complicated, illegal or unmappable input: fall back to the pivoting implementation */
*pErrorCode=U_USING_DEFAULT_WARNING;
return;
}
}
/*
* Make sure that the last byte sequence before sourceLimit is complete
* or runs into a lead byte.
* In the conversion loop compare source with sourceLimit only once
* per multi-byte character.
* For Latin-1, adjust sourceLimit only for 1 trail byte because
* the conversion loop handles at most 2-byte sequences.
*/
if(source<sourceLimit && U8_IS_LEAD(*(sourceLimit-1))) {
--sourceLimit;
}
/* conversion loop */
while(source<sourceLimit) {
if(targetCapacity>0) {
b=*source++;
if((int8_t)b>=0) {
/* convert ASCII */
*target++=(uint8_t)b;
--targetCapacity;
} else if( /* handle U+0080..U+00FF inline */
b>=0xc2 && b<=0xc3 &&
(t1=(uint8_t)(*source-0x80)) <= 0x3f
) {
++source;
*target++=(uint8_t)(((b&3)<<6)|t1);
--targetCapacity;
} else {
/* complicated, illegal or unmappable input: fall back to the pivoting implementation */
pToUArgs->source=(char *)(source-1);
pFromUArgs->target=(char *)target;
*pErrorCode=U_USING_DEFAULT_WARNING;
return;
}
} else {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
}
/*
* The sourceLimit may have been adjusted before the conversion loop
* to stop before a truncated sequence.
* If so, then collect the truncated sequence now.
* For Latin-1, there is at most exactly one lead byte because of the
* smaller sourceLimit adjustment logic.
*/
if(U_SUCCESS(*pErrorCode) && source<(sourceLimit=(uint8_t *)pToUArgs->sourceLimit)) {
utf8->toUnicodeStatus=utf8->toUBytes[0]=b=*source++;
utf8->toULength=1;
utf8->mode=utf8_countTrailBytes[b]+1;
}
/* write back the updated pointers */
pToUArgs->source=(char *)source;
pFromUArgs->target=(char *)target;
}
static void
_Latin1GetUnicodeSet(const UConverter *cnv,
const USetAdder *sa,
UConverterUnicodeSet which,
UErrorCode *pErrorCode) {
sa->addRange(sa->set, 0, 0xff);
}
static const UConverterImpl _Latin1Impl={
UCNV_LATIN_1,
NULL,
NULL,
NULL,
NULL,
NULL,
_Latin1ToUnicodeWithOffsets,
_Latin1ToUnicodeWithOffsets,
_Latin1FromUnicodeWithOffsets,
_Latin1FromUnicodeWithOffsets,
_Latin1GetNextUChar,
NULL,
NULL,
NULL,
NULL,
_Latin1GetUnicodeSet,
NULL,
ucnv_Latin1FromUTF8
};
static const UConverterStaticData _Latin1StaticData={
sizeof(UConverterStaticData),
"ISO-8859-1",
819, UCNV_IBM, UCNV_LATIN_1, 1, 1,
{ 0x1a, 0, 0, 0 }, 1, FALSE, FALSE,
0,
0,
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } /* reserved */
};
const UConverterSharedData _Latin1Data={
sizeof(UConverterSharedData), ~((uint32_t) 0),
NULL, NULL, &_Latin1StaticData, FALSE, &_Latin1Impl,
0
};
/* US-ASCII ----------------------------------------------------------------- */
/* This is a table-less version of ucnv_MBCSSingleToBMPWithOffsets(). */
static void
_ASCIIToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
const uint8_t *source, *sourceLimit;
UChar *target, *oldTarget;
int32_t targetCapacity, length;
int32_t *offsets;
int32_t sourceIndex;
uint8_t c;
/* set up the local pointers */
source=(const uint8_t *)pArgs->source;
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
target=oldTarget=pArgs->target;
targetCapacity=(int32_t)(pArgs->targetLimit-pArgs->target);
offsets=pArgs->offsets;
/* sourceIndex=-1 if the current character began in the previous buffer */
sourceIndex=0;
/*
* since the conversion here is 1:1 UChar:uint8_t, we need only one counter
* for the minimum of the sourceLength and targetCapacity
*/
length=(int32_t)(sourceLimit-source);
if(length<targetCapacity) {
targetCapacity=length;
}
if(targetCapacity>=8) {
/* This loop is unrolled for speed and improved pipelining. */
int32_t count, loops;
UChar oredChars;
loops=count=targetCapacity>>3;
do {
oredChars=target[0]=source[0];
oredChars|=target[1]=source[1];
oredChars|=target[2]=source[2];
oredChars|=target[3]=source[3];
oredChars|=target[4]=source[4];
oredChars|=target[5]=source[5];
oredChars|=target[6]=source[6];
oredChars|=target[7]=source[7];
/* were all 16 entries really valid? */
if(oredChars>0x7f) {
/* no, return to the first of these 16 */
break;
}
source+=8;
target+=8;
} while(--count>0);
count=loops-count;
targetCapacity-=count*8;
if(offsets!=NULL) {
oldTarget+=count*8;
while(count>0) {
offsets[0]=sourceIndex++;
offsets[1]=sourceIndex++;
offsets[2]=sourceIndex++;
offsets[3]=sourceIndex++;
offsets[4]=sourceIndex++;
offsets[5]=sourceIndex++;
offsets[6]=sourceIndex++;
offsets[7]=sourceIndex++;
offsets+=8;
--count;
}
}
}
/* conversion loop */
c=0;
while(targetCapacity>0 && (c=*source++)<=0x7f) {
*target++=c;
--targetCapacity;
}
if(c>0x7f) {
/* callback(illegal); copy the current bytes to toUBytes[] */
UConverter *cnv=pArgs->converter;
cnv->toUBytes[0]=c;
cnv->toULength=1;
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
} else if(source<sourceLimit && target>=pArgs->targetLimit) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
/* set offsets since the start */
if(offsets!=NULL) {
size_t count=target-oldTarget;
while(count>0) {
*offsets++=sourceIndex++;
--count;
}
}
/* write back the updated pointers */
pArgs->source=(const char *)source;
pArgs->target=target;
pArgs->offsets=offsets;
}
/* This is a table-less version of ucnv_MBCSSingleGetNextUChar(). */
static UChar32
_ASCIIGetNextUChar(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
const uint8_t *source;
uint8_t b;
source=(const uint8_t *)pArgs->source;
if(source<(const uint8_t *)pArgs->sourceLimit) {
b=*source++;
pArgs->source=(const char *)source;
if(b<=0x7f) {
return b;
} else {
UConverter *cnv=pArgs->converter;
cnv->toUBytes[0]=b;
cnv->toULength=1;
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
return 0xffff;
}
}
/* no output because of empty input */
*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
return 0xffff;
}
/* "Convert" UTF-8 to US-ASCII: Validate and copy. */
static void
ucnv_ASCIIFromUTF8(UConverterFromUnicodeArgs *pFromUArgs,
UConverterToUnicodeArgs *pToUArgs,
UErrorCode *pErrorCode) {
const uint8_t *source, *sourceLimit;
uint8_t *target;
int32_t targetCapacity, length;
uint8_t c;
if(pToUArgs->converter->toUnicodeStatus!=0) {
/* no handling of partial UTF-8 characters here, fall back to pivoting */
*pErrorCode=U_USING_DEFAULT_WARNING;
return;
}
/* set up the local pointers */
source=(const uint8_t *)pToUArgs->source;
sourceLimit=(const uint8_t *)pToUArgs->sourceLimit;
target=(uint8_t *)pFromUArgs->target;
targetCapacity=(int32_t)(pFromUArgs->targetLimit-pFromUArgs->target);
/*
* since the conversion here is 1:1 uint8_t:uint8_t, we need only one counter
* for the minimum of the sourceLength and targetCapacity
*/
length=(int32_t)(sourceLimit-source);
if(length<targetCapacity) {
targetCapacity=length;
}
/* unroll the loop with the most common case */
if(targetCapacity>=16) {
int32_t count, loops;
uint8_t oredChars;
loops=count=targetCapacity>>4;
do {
oredChars=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
oredChars|=*target++=*source++;
/* were all 16 entries really valid? */
if(oredChars>0x7f) {
/* no, return to the first of these 16 */
source-=16;
target-=16;
break;
}
} while(--count>0);
count=loops-count;
targetCapacity-=16*count;
}
/* conversion loop */
c=0;
while(targetCapacity>0 && (c=*source)<=0x7f) {
++source;
*target++=c;
--targetCapacity;
}
if(c>0x7f) {
/* non-ASCII character, handle in standard converter */
*pErrorCode=U_USING_DEFAULT_WARNING;
} else if(source<sourceLimit && target>=(const uint8_t *)pFromUArgs->targetLimit) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
/* write back the updated pointers */
pToUArgs->source=(const char *)source;
pFromUArgs->target=(char *)target;
}
static void
_ASCIIGetUnicodeSet(const UConverter *cnv,
const USetAdder *sa,
UConverterUnicodeSet which,
UErrorCode *pErrorCode) {
sa->addRange(sa->set, 0, 0x7f);
}
static const UConverterImpl _ASCIIImpl={
UCNV_US_ASCII,
NULL,
NULL,
NULL,
NULL,
NULL,
_ASCIIToUnicodeWithOffsets,
_ASCIIToUnicodeWithOffsets,
_Latin1FromUnicodeWithOffsets,
_Latin1FromUnicodeWithOffsets,
_ASCIIGetNextUChar,
NULL,
NULL,
NULL,
NULL,
_ASCIIGetUnicodeSet,
NULL,
ucnv_ASCIIFromUTF8
};
static const UConverterStaticData _ASCIIStaticData={
sizeof(UConverterStaticData),
"US-ASCII",
367, UCNV_IBM, UCNV_US_ASCII, 1, 1,
{ 0x1a, 0, 0, 0 }, 1, FALSE, FALSE,
0,
0,
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } /* reserved */
};
const UConverterSharedData _ASCIIData={
sizeof(UConverterSharedData), ~((uint32_t) 0),
NULL, NULL, &_ASCIIStaticData, FALSE, &_ASCIIImpl,
0
};
#endif