| // © 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:   UTF-8 | 
 | *   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" | 
 | #include "ustr_imp.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(). */ | 
 | U_CDECL_BEGIN | 
 | static void U_CALLCONV | 
 | _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 U_CALLCONV | 
 | _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 U_CALLCONV | 
 | _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 U_CALLCONV | 
 | 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 */ | 
 |     if (utf8->toULength > 0) { | 
 |         c=(UChar32)utf8->toUnicodeStatus; | 
 |     } else { | 
 |         c = 0; | 
 |     } | 
 |     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(U8_IS_SINGLE(b)) { | 
 |                 /* 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_BYTES(b); | 
 |     } | 
 |  | 
 |     /* write back the updated pointers */ | 
 |     pToUArgs->source=(char *)source; | 
 |     pFromUArgs->target=(char *)target; | 
 | } | 
 |  | 
 | static void U_CALLCONV | 
 | _Latin1GetUnicodeSet(const UConverter *cnv, | 
 |                      const USetAdder *sa, | 
 |                      UConverterUnicodeSet which, | 
 |                      UErrorCode *pErrorCode) { | 
 |     (void)cnv; | 
 |     (void)which; | 
 |     (void)pErrorCode; | 
 |     sa->addRange(sa->set, 0, 0xff); | 
 | } | 
 | U_CDECL_END | 
 |  | 
 |  | 
 | 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 ----------------------------------------------------------------- */ | 
 |  | 
 | U_CDECL_BEGIN | 
 | /* This is a table-less version of ucnv_MBCSSingleToBMPWithOffsets(). */ | 
 | static void U_CALLCONV | 
 | _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 U_CALLCONV | 
 | _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 U_CALLCONV | 
 | 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->toULength > 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 U_CALLCONV | 
 | _ASCIIGetUnicodeSet(const UConverter *cnv, | 
 |                     const USetAdder *sa, | 
 |                     UConverterUnicodeSet which, | 
 |                     UErrorCode *pErrorCode) { | 
 |     (void)cnv; | 
 |     (void)which; | 
 |     (void)pErrorCode; | 
 |     sa->addRange(sa->set, 0, 0x7f); | 
 | } | 
 | U_CDECL_END | 
 |  | 
 | 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 |