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Diffstat (limited to 'Build/source/libs/icu/icu-50.1/common/bmpset.cpp')
-rw-r--r-- | Build/source/libs/icu/icu-50.1/common/bmpset.cpp | 732 |
1 files changed, 732 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-50.1/common/bmpset.cpp b/Build/source/libs/icu/icu-50.1/common/bmpset.cpp new file mode 100644 index 00000000000..b874436eced --- /dev/null +++ b/Build/source/libs/icu/icu-50.1/common/bmpset.cpp @@ -0,0 +1,732 @@ +/* +****************************************************************************** +* +* Copyright (C) 2007-2012, International Business Machines +* Corporation and others. All Rights Reserved. +* +****************************************************************************** +* file name: bmpset.cpp +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 2007jan29 +* created by: Markus W. Scherer +*/ + +#include "unicode/utypes.h" +#include "unicode/uniset.h" +#include "unicode/utf8.h" +#include "unicode/utf16.h" +#include "cmemory.h" +#include "bmpset.h" +#include "uassert.h" + +U_NAMESPACE_BEGIN + +BMPSet::BMPSet(const int32_t *parentList, int32_t parentListLength) : + list(parentList), listLength(parentListLength) { + uprv_memset(asciiBytes, 0, sizeof(asciiBytes)); + uprv_memset(table7FF, 0, sizeof(table7FF)); + uprv_memset(bmpBlockBits, 0, sizeof(bmpBlockBits)); + + /* + * Set the list indexes for binary searches for + * U+0800, U+1000, U+2000, .., U+F000, U+10000. + * U+0800 is the first 3-byte-UTF-8 code point. Lower code points are + * looked up in the bit tables. + * The last pair of indexes is for finding supplementary code points. + */ + list4kStarts[0]=findCodePoint(0x800, 0, listLength-1); + int32_t i; + for(i=1; i<=0x10; ++i) { + list4kStarts[i]=findCodePoint(i<<12, list4kStarts[i-1], listLength-1); + } + list4kStarts[0x11]=listLength-1; + + initBits(); + overrideIllegal(); +} + +BMPSet::BMPSet(const BMPSet &otherBMPSet, const int32_t *newParentList, int32_t newParentListLength) : + list(newParentList), listLength(newParentListLength) { + uprv_memcpy(asciiBytes, otherBMPSet.asciiBytes, sizeof(asciiBytes)); + uprv_memcpy(table7FF, otherBMPSet.table7FF, sizeof(table7FF)); + uprv_memcpy(bmpBlockBits, otherBMPSet.bmpBlockBits, sizeof(bmpBlockBits)); + uprv_memcpy(list4kStarts, otherBMPSet.list4kStarts, sizeof(list4kStarts)); +} + +BMPSet::~BMPSet() { +} + +/* + * Set bits in a bit rectangle in "vertical" bit organization. + * start<limit<=0x800 + */ +static void set32x64Bits(uint32_t table[64], int32_t start, int32_t limit) { + U_ASSERT(start<limit); + U_ASSERT(limit<=0x800); + + int32_t lead=start>>6; // Named for UTF-8 2-byte lead byte with upper 5 bits. + int32_t trail=start&0x3f; // Named for UTF-8 2-byte trail byte with lower 6 bits. + + // Set one bit indicating an all-one block. + uint32_t bits=(uint32_t)1<<lead; + if((start+1)==limit) { // Single-character shortcut. + table[trail]|=bits; + return; + } + + int32_t limitLead=limit>>6; + int32_t limitTrail=limit&0x3f; + + if(lead==limitLead) { + // Partial vertical bit column. + while(trail<limitTrail) { + table[trail++]|=bits; + } + } else { + // Partial vertical bit column, + // followed by a bit rectangle, + // followed by another partial vertical bit column. + if(trail>0) { + do { + table[trail++]|=bits; + } while(trail<64); + ++lead; + } + if(lead<limitLead) { + bits=~((1<<lead)-1); + if(limitLead<0x20) { + bits&=(1<<limitLead)-1; + } + for(trail=0; trail<64; ++trail) { + table[trail]|=bits; + } + } + // limit<=0x800. If limit==0x800 then limitLead=32 and limitTrail=0. + // In that case, bits=1<<limitLead is undefined but the bits value + // is not used because trail<limitTrail is already false. + bits=(uint32_t)1<<((limitLead == 0x20) ? (limitLead - 1) : limitLead); + for(trail=0; trail<limitTrail; ++trail) { + table[trail]|=bits; + } + } +} + +void BMPSet::initBits() { + UChar32 start, limit; + int32_t listIndex=0; + + // Set asciiBytes[]. + do { + start=list[listIndex++]; + if(listIndex<listLength) { + limit=list[listIndex++]; + } else { + limit=0x110000; + } + if(start>=0x80) { + break; + } + do { + asciiBytes[start++]=1; + } while(start<limit && start<0x80); + } while(limit<=0x80); + + // Set table7FF[]. + while(start<0x800) { + set32x64Bits(table7FF, start, limit<=0x800 ? limit : 0x800); + if(limit>0x800) { + start=0x800; + break; + } + + start=list[listIndex++]; + if(listIndex<listLength) { + limit=list[listIndex++]; + } else { + limit=0x110000; + } + } + + // Set bmpBlockBits[]. + int32_t minStart=0x800; + while(start<0x10000) { + if(limit>0x10000) { + limit=0x10000; + } + + if(start<minStart) { + start=minStart; + } + if(start<limit) { // Else: Another range entirely in a known mixed-value block. + if(start&0x3f) { + // Mixed-value block of 64 code points. + start>>=6; + bmpBlockBits[start&0x3f]|=0x10001<<(start>>6); + start=(start+1)<<6; // Round up to the next block boundary. + minStart=start; // Ignore further ranges in this block. + } + if(start<limit) { + if(start<(limit&~0x3f)) { + // Multiple all-ones blocks of 64 code points each. + set32x64Bits(bmpBlockBits, start>>6, limit>>6); + } + + if(limit&0x3f) { + // Mixed-value block of 64 code points. + limit>>=6; + bmpBlockBits[limit&0x3f]|=0x10001<<(limit>>6); + limit=(limit+1)<<6; // Round up to the next block boundary. + minStart=limit; // Ignore further ranges in this block. + } + } + } + + if(limit==0x10000) { + break; + } + + start=list[listIndex++]; + if(listIndex<listLength) { + limit=list[listIndex++]; + } else { + limit=0x110000; + } + } +} + +/* + * Override some bits and bytes to the result of contains(FFFD) + * for faster validity checking at runtime. + * No need to set 0 values where they were reset to 0 in the constructor + * and not modified by initBits(). + * (asciiBytes[] trail bytes, table7FF[] 0..7F, bmpBlockBits[] 0..7FF) + * Need to set 0 values for surrogates D800..DFFF. + */ +void BMPSet::overrideIllegal() { + uint32_t bits, mask; + int32_t i; + + if(containsSlow(0xfffd, list4kStarts[0xf], list4kStarts[0x10])) { + // contains(FFFD)==TRUE + for(i=0x80; i<0xc0; ++i) { + asciiBytes[i]=1; + } + + bits=3; // Lead bytes 0xC0 and 0xC1. + for(i=0; i<64; ++i) { + table7FF[i]|=bits; + } + + bits=1; // Lead byte 0xE0. + for(i=0; i<32; ++i) { // First half of 4k block. + bmpBlockBits[i]|=bits; + } + + mask=~(0x10001<<0xd); // Lead byte 0xED. + bits=1<<0xd; + for(i=32; i<64; ++i) { // Second half of 4k block. + bmpBlockBits[i]=(bmpBlockBits[i]&mask)|bits; + } + } else { + // contains(FFFD)==FALSE + mask=~(0x10001<<0xd); // Lead byte 0xED. + for(i=32; i<64; ++i) { // Second half of 4k block. + bmpBlockBits[i]&=mask; + } + } +} + +int32_t BMPSet::findCodePoint(UChar32 c, int32_t lo, int32_t hi) const { + /* Examples: + findCodePoint(c) + set list[] c=0 1 3 4 7 8 + === ============== =========== + [] [110000] 0 0 0 0 0 0 + [\u0000-\u0003] [0, 4, 110000] 1 1 1 2 2 2 + [\u0004-\u0007] [4, 8, 110000] 0 0 0 1 1 2 + [:Any:] [0, 110000] 1 1 1 1 1 1 + */ + + // Return the smallest i such that c < list[i]. Assume + // list[len - 1] == HIGH and that c is legal (0..HIGH-1). + if (c < list[lo]) + return lo; + // High runner test. c is often after the last range, so an + // initial check for this condition pays off. + if (lo >= hi || c >= list[hi-1]) + return hi; + // invariant: c >= list[lo] + // invariant: c < list[hi] + for (;;) { + int32_t i = (lo + hi) >> 1; + if (i == lo) { + break; // Found! + } else if (c < list[i]) { + hi = i; + } else { + lo = i; + } + } + return hi; +} + +UBool +BMPSet::contains(UChar32 c) const { + if((uint32_t)c<=0x7f) { + return (UBool)asciiBytes[c]; + } else if((uint32_t)c<=0x7ff) { + return (UBool)((table7FF[c&0x3f]&((uint32_t)1<<(c>>6)))!=0); + } else if((uint32_t)c<0xd800 || (c>=0xe000 && c<=0xffff)) { + int lead=c>>12; + uint32_t twoBits=(bmpBlockBits[(c>>6)&0x3f]>>lead)&0x10001; + if(twoBits<=1) { + // All 64 code points with the same bits 15..6 + // are either in the set or not. + return (UBool)twoBits; + } else { + // Look up the code point in its 4k block of code points. + return containsSlow(c, list4kStarts[lead], list4kStarts[lead+1]); + } + } else if((uint32_t)c<=0x10ffff) { + // surrogate or supplementary code point + return containsSlow(c, list4kStarts[0xd], list4kStarts[0x11]); + } else { + // Out-of-range code points get FALSE, consistent with long-standing + // behavior of UnicodeSet::contains(c). + return FALSE; + } +} + +/* + * Check for sufficient length for trail unit for each surrogate pair. + * Handle single surrogates as surrogate code points as usual in ICU. + */ +const UChar * +BMPSet::span(const UChar *s, const UChar *limit, USetSpanCondition spanCondition) const { + UChar c, c2; + + if(spanCondition) { + // span + do { + c=*s; + if(c<=0x7f) { + if(!asciiBytes[c]) { + break; + } + } else if(c<=0x7ff) { + if((table7FF[c&0x3f]&((uint32_t)1<<(c>>6)))==0) { + break; + } + } else if(c<0xd800 || c>=0xe000) { + int lead=c>>12; + uint32_t twoBits=(bmpBlockBits[(c>>6)&0x3f]>>lead)&0x10001; + if(twoBits<=1) { + // All 64 code points with the same bits 15..6 + // are either in the set or not. + if(twoBits==0) { + break; + } + } else { + // Look up the code point in its 4k block of code points. + if(!containsSlow(c, list4kStarts[lead], list4kStarts[lead+1])) { + break; + } + } + } else if(c>=0xdc00 || (s+1)==limit || (c2=s[1])<0xdc00 || c2>=0xe000) { + // surrogate code point + if(!containsSlow(c, list4kStarts[0xd], list4kStarts[0xe])) { + break; + } + } else { + // surrogate pair + if(!containsSlow(U16_GET_SUPPLEMENTARY(c, c2), list4kStarts[0x10], list4kStarts[0x11])) { + break; + } + ++s; + } + } while(++s<limit); + } else { + // span not + do { + c=*s; + if(c<=0x7f) { + if(asciiBytes[c]) { + break; + } + } else if(c<=0x7ff) { + if((table7FF[c&0x3f]&((uint32_t)1<<(c>>6)))!=0) { + break; + } + } else if(c<0xd800 || c>=0xe000) { + int lead=c>>12; + uint32_t twoBits=(bmpBlockBits[(c>>6)&0x3f]>>lead)&0x10001; + if(twoBits<=1) { + // All 64 code points with the same bits 15..6 + // are either in the set or not. + if(twoBits!=0) { + break; + } + } else { + // Look up the code point in its 4k block of code points. + if(containsSlow(c, list4kStarts[lead], list4kStarts[lead+1])) { + break; + } + } + } else if(c>=0xdc00 || (s+1)==limit || (c2=s[1])<0xdc00 || c2>=0xe000) { + // surrogate code point + if(containsSlow(c, list4kStarts[0xd], list4kStarts[0xe])) { + break; + } + } else { + // surrogate pair + if(containsSlow(U16_GET_SUPPLEMENTARY(c, c2), list4kStarts[0x10], list4kStarts[0x11])) { + break; + } + ++s; + } + } while(++s<limit); + } + return s; +} + +/* Symmetrical with span(). */ +const UChar * +BMPSet::spanBack(const UChar *s, const UChar *limit, USetSpanCondition spanCondition) const { + UChar c, c2; + + if(spanCondition) { + // span + for(;;) { + c=*(--limit); + if(c<=0x7f) { + if(!asciiBytes[c]) { + break; + } + } else if(c<=0x7ff) { + if((table7FF[c&0x3f]&((uint32_t)1<<(c>>6)))==0) { + break; + } + } else if(c<0xd800 || c>=0xe000) { + int lead=c>>12; + uint32_t twoBits=(bmpBlockBits[(c>>6)&0x3f]>>lead)&0x10001; + if(twoBits<=1) { + // All 64 code points with the same bits 15..6 + // are either in the set or not. + if(twoBits==0) { + break; + } + } else { + // Look up the code point in its 4k block of code points. + if(!containsSlow(c, list4kStarts[lead], list4kStarts[lead+1])) { + break; + } + } + } else if(c<0xdc00 || s==limit || (c2=*(limit-1))<0xd800 || c2>=0xdc00) { + // surrogate code point + if(!containsSlow(c, list4kStarts[0xd], list4kStarts[0xe])) { + break; + } + } else { + // surrogate pair + if(!containsSlow(U16_GET_SUPPLEMENTARY(c2, c), list4kStarts[0x10], list4kStarts[0x11])) { + break; + } + --limit; + } + if(s==limit) { + return s; + } + } + } else { + // span not + for(;;) { + c=*(--limit); + if(c<=0x7f) { + if(asciiBytes[c]) { + break; + } + } else if(c<=0x7ff) { + if((table7FF[c&0x3f]&((uint32_t)1<<(c>>6)))!=0) { + break; + } + } else if(c<0xd800 || c>=0xe000) { + int lead=c>>12; + uint32_t twoBits=(bmpBlockBits[(c>>6)&0x3f]>>lead)&0x10001; + if(twoBits<=1) { + // All 64 code points with the same bits 15..6 + // are either in the set or not. + if(twoBits!=0) { + break; + } + } else { + // Look up the code point in its 4k block of code points. + if(containsSlow(c, list4kStarts[lead], list4kStarts[lead+1])) { + break; + } + } + } else if(c<0xdc00 || s==limit || (c2=*(limit-1))<0xd800 || c2>=0xdc00) { + // surrogate code point + if(containsSlow(c, list4kStarts[0xd], list4kStarts[0xe])) { + break; + } + } else { + // surrogate pair + if(containsSlow(U16_GET_SUPPLEMENTARY(c2, c), list4kStarts[0x10], list4kStarts[0x11])) { + break; + } + --limit; + } + if(s==limit) { + return s; + } + } + } + return limit+1; +} + +/* + * Precheck for sufficient trail bytes at end of string only once per span. + * Check validity. + */ +const uint8_t * +BMPSet::spanUTF8(const uint8_t *s, int32_t length, USetSpanCondition spanCondition) const { + const uint8_t *limit=s+length; + uint8_t b=*s; + if((int8_t)b>=0) { + // Initial all-ASCII span. + if(spanCondition) { + do { + if(!asciiBytes[b] || ++s==limit) { + return s; + } + b=*s; + } while((int8_t)b>=0); + } else { + do { + if(asciiBytes[b] || ++s==limit) { + return s; + } + b=*s; + } while((int8_t)b>=0); + } + length=(int32_t)(limit-s); + } + + if(spanCondition!=USET_SPAN_NOT_CONTAINED) { + spanCondition=USET_SPAN_CONTAINED; // Pin to 0/1 values. + } + + const uint8_t *limit0=limit; + + /* + * Make sure that the last 1/2/3/4-byte sequence before limit is complete + * or runs into a lead byte. + * In the span loop compare s with limit only once + * per multi-byte character. + * + * Give a trailing illegal sequence the same value as the result of contains(FFFD), + * including it if that is part of the span, otherwise set limit0 to before + * the truncated sequence. + */ + b=*(limit-1); + if((int8_t)b<0) { + // b>=0x80: lead or trail byte + if(b<0xc0) { + // single trail byte, check for preceding 3- or 4-byte lead byte + if(length>=2 && (b=*(limit-2))>=0xe0) { + limit-=2; + if(asciiBytes[0x80]!=spanCondition) { + limit0=limit; + } + } else if(b<0xc0 && b>=0x80 && length>=3 && (b=*(limit-3))>=0xf0) { + // 4-byte lead byte with only two trail bytes + limit-=3; + if(asciiBytes[0x80]!=spanCondition) { + limit0=limit; + } + } + } else { + // lead byte with no trail bytes + --limit; + if(asciiBytes[0x80]!=spanCondition) { + limit0=limit; + } + } + } + + uint8_t t1, t2, t3; + + while(s<limit) { + b=*s; + if(b<0xc0) { + // ASCII; or trail bytes with the result of contains(FFFD). + if(spanCondition) { + do { + if(!asciiBytes[b]) { + return s; + } else if(++s==limit) { + return limit0; + } + b=*s; + } while(b<0xc0); + } else { + do { + if(asciiBytes[b]) { + return s; + } else if(++s==limit) { + return limit0; + } + b=*s; + } while(b<0xc0); + } + } + ++s; // Advance past the lead byte. + if(b>=0xe0) { + if(b<0xf0) { + if( /* handle U+0000..U+FFFF inline */ + (t1=(uint8_t)(s[0]-0x80)) <= 0x3f && + (t2=(uint8_t)(s[1]-0x80)) <= 0x3f + ) { + b&=0xf; + uint32_t twoBits=(bmpBlockBits[t1]>>b)&0x10001; + if(twoBits<=1) { + // All 64 code points with this lead byte and middle trail byte + // are either in the set or not. + if(twoBits!=(uint32_t)spanCondition) { + return s-1; + } + } else { + // Look up the code point in its 4k block of code points. + UChar32 c=(b<<12)|(t1<<6)|t2; + if(containsSlow(c, list4kStarts[b], list4kStarts[b+1]) != spanCondition) { + return s-1; + } + } + s+=2; + continue; + } + } else if( /* handle U+10000..U+10FFFF inline */ + (t1=(uint8_t)(s[0]-0x80)) <= 0x3f && + (t2=(uint8_t)(s[1]-0x80)) <= 0x3f && + (t3=(uint8_t)(s[2]-0x80)) <= 0x3f + ) { + // Give an illegal sequence the same value as the result of contains(FFFD). + UChar32 c=((UChar32)(b-0xf0)<<18)|((UChar32)t1<<12)|(t2<<6)|t3; + if( ( (0x10000<=c && c<=0x10ffff) ? + containsSlow(c, list4kStarts[0x10], list4kStarts[0x11]) : + asciiBytes[0x80] + ) != spanCondition + ) { + return s-1; + } + s+=3; + continue; + } + } else /* 0xc0<=b<0xe0 */ { + if( /* handle U+0000..U+07FF inline */ + (t1=(uint8_t)(*s-0x80)) <= 0x3f + ) { + if((USetSpanCondition)((table7FF[t1]&((uint32_t)1<<(b&0x1f)))!=0) != spanCondition) { + return s-1; + } + ++s; + continue; + } + } + + // Give an illegal sequence the same value as the result of contains(FFFD). + // Handle each byte of an illegal sequence separately to simplify the code; + // no need to optimize error handling. + if(asciiBytes[0x80]!=spanCondition) { + return s-1; + } + } + + return limit0; +} + +/* + * While going backwards through UTF-8 optimize only for ASCII. + * Unlike UTF-16, UTF-8 is not forward-backward symmetrical, that is, it is not + * possible to tell from the last byte in a multi-byte sequence how many + * preceding bytes there should be. Therefore, going backwards through UTF-8 + * is much harder than going forward. + */ +int32_t +BMPSet::spanBackUTF8(const uint8_t *s, int32_t length, USetSpanCondition spanCondition) const { + if(spanCondition!=USET_SPAN_NOT_CONTAINED) { + spanCondition=USET_SPAN_CONTAINED; // Pin to 0/1 values. + } + + uint8_t b; + + do { + b=s[--length]; + if((int8_t)b>=0) { + // ASCII sub-span + if(spanCondition) { + do { + if(!asciiBytes[b]) { + return length+1; + } else if(length==0) { + return 0; + } + b=s[--length]; + } while((int8_t)b>=0); + } else { + do { + if(asciiBytes[b]) { + return length+1; + } else if(length==0) { + return 0; + } + b=s[--length]; + } while((int8_t)b>=0); + } + } + + int32_t prev=length; + UChar32 c; + if(b<0xc0) { + // trail byte: collect a multi-byte character + c=utf8_prevCharSafeBody(s, 0, &length, b, -1); + if(c<0) { + c=0xfffd; + } + } else { + // lead byte in last-trail position + c=0xfffd; + } + // c is a valid code point, not ASCII, not a surrogate + if(c<=0x7ff) { + if((USetSpanCondition)((table7FF[c&0x3f]&((uint32_t)1<<(c>>6)))!=0) != spanCondition) { + return prev+1; + } + } else if(c<=0xffff) { + int lead=c>>12; + uint32_t twoBits=(bmpBlockBits[(c>>6)&0x3f]>>lead)&0x10001; + if(twoBits<=1) { + // All 64 code points with the same bits 15..6 + // are either in the set or not. + if(twoBits!=(uint32_t)spanCondition) { + return prev+1; + } + } else { + // Look up the code point in its 4k block of code points. + if(containsSlow(c, list4kStarts[lead], list4kStarts[lead+1]) != spanCondition) { + return prev+1; + } + } + } else { + if(containsSlow(c, list4kStarts[0x10], list4kStarts[0x11]) != spanCondition) { + return prev+1; + } + } + } while(length>0); + return 0; +} + +U_NAMESPACE_END |