+ length=*mapping&MAPPING_LENGTH_MASK;
+ return (const UChar *)mapping+1;
+ }
+ }
+}
+
+// The capacity of the buffer must be 30=MAPPING_LENGTH_MASK-1
+// so that a raw mapping fits that consists of one unit ("rm0")
+// plus all but the first two code units of the normal mapping.
+// The maximum length of a normal mapping is 31=MAPPING_LENGTH_MASK.
+const UChar *
+Normalizer2Impl::getRawDecomposition(UChar32 c, UChar buffer[30], int32_t &length) const {
+ // We do not loop in this method because an algorithmic mapping itself
+ // becomes a final result rather than having to be decomposed recursively.
+ uint16_t norm16;
+ if(c<minDecompNoCP || isDecompYes(norm16=getNorm16(c))) {
+ // c does not decompose
+ return NULL;
+ } else if(isHangul(norm16)) {
+ // Hangul syllable: decompose algorithmically
+ Hangul::getRawDecomposition(c, buffer);
+ length=2;
+ return buffer;
+ } else if(isDecompNoAlgorithmic(norm16)) {
+ c=mapAlgorithmic(c, norm16);
+ length=0;
+ U16_APPEND_UNSAFE(buffer, length, c);
+ return buffer;
+ } else {
+ // c decomposes, get everything from the variable-length extra data
+ const uint16_t *mapping=getMapping(norm16);
+ uint16_t firstUnit=*mapping;
+ int32_t mLength=firstUnit&MAPPING_LENGTH_MASK; // length of normal mapping
+ if(firstUnit&MAPPING_HAS_RAW_MAPPING) {
+ // Read the raw mapping from before the firstUnit and before the optional ccc/lccc word.
+ // Bit 7=MAPPING_HAS_CCC_LCCC_WORD
+ const uint16_t *rawMapping=mapping-((firstUnit>>7)&1)-1;
+ uint16_t rm0=*rawMapping;
+ if(rm0<=MAPPING_LENGTH_MASK) {
+ length=rm0;
+ return (const UChar *)rawMapping-rm0;
+ } else {
+ // Copy the normal mapping and replace its first two code units with rm0.
+ buffer[0]=(UChar)rm0;
+ u_memcpy(buffer+1, (const UChar *)mapping+1+2, mLength-2);
+ length=mLength-1;
+ return buffer;
projects / apple / icu.git / blobdiff