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      1 /*
      2 *******************************************************************************
      3 *   Copyright (C) 2011, International Business Machines
      4 *   Corporation and others.  All Rights Reserved.
      5 *******************************************************************************
      6 *   file name:  appendable.cpp
      7 *   encoding:   US-ASCII
      8 *   tab size:   8 (not used)
      9 *   indentation:4
     10 *
     11 *   created on: 2010dec07
     12 *   created by: Markus W. Scherer
     13 */
     14 
     15 #include "unicode/utypes.h"
     16 #include "unicode/appendable.h"
     17 #include "unicode/utf16.h"
     18 
     19 U_NAMESPACE_BEGIN
     20 
     21 Appendable::~Appendable() {}
     22 
     23 UBool
     24 Appendable::appendCodePoint(UChar32 c) {
     25     if(c<=0xffff) {
     26         return appendCodeUnit((UChar)c);
     27     } else {
     28         return appendCodeUnit(U16_LEAD(c)) && appendCodeUnit(U16_TRAIL(c));
     29     }
     30 }
     31 
     32 UBool
     33 Appendable::appendString(const UChar *s, int32_t length) {
     34     if(length<0) {
     35         UChar c;
     36         while((c=*s++)!=0) {
     37             if(!appendCodeUnit(c)) {
     38                 return FALSE;
     39             }
     40         }
     41     } else if(length>0) {
     42         const UChar *limit=s+length;
     43         do {
     44             if(!appendCodeUnit(*s++)) {
     45                 return FALSE;
     46             }
     47         } while(s<limit);
     48     }
     49     return TRUE;
     50 }
     51 
     52 UBool
     53 Appendable::reserveAppendCapacity(int32_t /*appendCapacity*/) {
     54     return TRUE;
     55 }
     56 
     57 UChar *
     58 Appendable::getAppendBuffer(int32_t minCapacity,
     59                             int32_t /*desiredCapacityHint*/,
     60                             UChar *scratch, int32_t scratchCapacity,
     61                             int32_t *resultCapacity) {
     62     if(minCapacity<1 || scratchCapacity<minCapacity) {
     63         *resultCapacity=0;
     64         return NULL;
     65     }
     66     *resultCapacity=scratchCapacity;
     67     return scratch;
     68 }
     69 
     70 UOBJECT_DEFINE_NO_RTTI_IMPLEMENTATION(Appendable)
     71 
     72 // UnicodeStringAppendable is implemented in unistr.cpp.
     73 
     74 U_NAMESPACE_END
     75