michael@0: /*
michael@0: *******************************************************************************
michael@0: *   Copyright (C) 2011-2012, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: *******************************************************************************
michael@0: *   file name:  appendable.cpp
michael@0: *   encoding:   US-ASCII
michael@0: *   tab size:   8 (not used)
michael@0: *   indentation:4
michael@0: *
michael@0: *   created on: 2010dec07
michael@0: *   created by: Markus W. Scherer
michael@0: */
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: #include "unicode/appendable.h"
michael@0: #include "unicode/utf16.h"
michael@0: 
michael@0: U_NAMESPACE_BEGIN
michael@0: 
michael@0: Appendable::~Appendable() {}
michael@0: 
michael@0: UBool
michael@0: Appendable::appendCodePoint(UChar32 c) {
michael@0:     if(c<=0xffff) {
michael@0:         return appendCodeUnit((UChar)c);
michael@0:     } else {
michael@0:         return appendCodeUnit(U16_LEAD(c)) && appendCodeUnit(U16_TRAIL(c));
michael@0:     }
michael@0: }
michael@0: 
michael@0: UBool
michael@0: Appendable::appendString(const UChar *s, int32_t length) {
michael@0:     if(length<0) {
michael@0:         UChar c;
michael@0:         while((c=*s++)!=0) {
michael@0:             if(!appendCodeUnit(c)) {
michael@0:                 return FALSE;
michael@0:             }
michael@0:         }
michael@0:     } else if(length>0) {
michael@0:         const UChar *limit=s+length;
michael@0:         do {
michael@0:             if(!appendCodeUnit(*s++)) {
michael@0:                 return FALSE;
michael@0:             }
michael@0:         } while(s<limit);
michael@0:     }
michael@0:     return TRUE;
michael@0: }
michael@0: 
michael@0: UBool
michael@0: Appendable::reserveAppendCapacity(int32_t /*appendCapacity*/) {
michael@0:     return TRUE;
michael@0: }
michael@0: 
michael@0: UChar *
michael@0: Appendable::getAppendBuffer(int32_t minCapacity,
michael@0:                             int32_t /*desiredCapacityHint*/,
michael@0:                             UChar *scratch, int32_t scratchCapacity,
michael@0:                             int32_t *resultCapacity) {
michael@0:     if(minCapacity<1 || scratchCapacity<minCapacity) {
michael@0:         *resultCapacity=0;
michael@0:         return NULL;
michael@0:     }
michael@0:     *resultCapacity=scratchCapacity;
michael@0:     return scratch;
michael@0: }
michael@0: 
michael@0: // UnicodeStringAppendable is implemented in unistr.cpp.
michael@0: 
michael@0: U_NAMESPACE_END