diff options
Diffstat (limited to 'intl/icu/source/common/ucnvlat1.c')
-rw-r--r-- | intl/icu/source/common/ucnvlat1.c | 740 |
1 files changed, 740 insertions, 0 deletions
diff --git a/intl/icu/source/common/ucnvlat1.c b/intl/icu/source/common/ucnvlat1.c new file mode 100644 index 000000000..f17777f06 --- /dev/null +++ b/intl/icu/source/common/ucnvlat1.c @@ -0,0 +1,740 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +********************************************************************** +* Copyright (C) 2000-2015, 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 "unicode/utf8.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=U8_COUNT_TRAIL_BYTES(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= + UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_Latin1StaticData, &_Latin1Impl); + +/* 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= + UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_ASCIIStaticData, &_ASCIIImpl); + +#endif |