src/third_party/icu/source/i18n/ucoleitr.cpp - cobalt - Git at Google

 /*
 ******************************************************************************
 *   Copyright (C) 2001-2015, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 ******************************************************************************
 *
 * File ucoleitr.cpp
 *
 * Modification History:
 *
 * Date        Name        Description
 * 02/15/2001  synwee      Modified all methods to process its own function
 *                         instead of calling the equivalent c++ api (coleitr.h)
 * 2012-2014   markus      Rewritten in C++ again.
 ******************************************************************************/

 #include "unicode/utypes.h"

 #if !UCONFIG_NO_COLLATION

 #include "starboard/client_porting/poem/string_poem.h"
 #include "unicode/coleitr.h"
 #include "unicode/tblcoll.h"
 #include "unicode/ucoleitr.h"
 #include "unicode/ustring.h"
 #include "unicode/sortkey.h"
 #include "unicode/uobject.h"
 #include "cmemory.h"
 #include "usrchimp.h"

 U_NAMESPACE_USE

 #define BUFFER_LENGTH             100

 #define DEFAULT_BUFFER_SIZE 16
 #define BUFFER_GROW 8

 #define ARRAY_COPY(dst, src, count) uprv_memcpy((void *) (dst), (void *) (src), (count) * sizeof (src)[0])

 #define NEW_ARRAY(type, count) (type *) uprv_malloc((count) * sizeof(type))

 #define DELETE_ARRAY(array) uprv_free((void *) (array))

 struct RCEI
 {
     uint32_t ce;
     int32_t  low;
     int32_t  high;
 };

 U_NAMESPACE_BEGIN

 struct RCEBuffer
 {
     RCEI    defaultBuffer[DEFAULT_BUFFER_SIZE];
     RCEI   *buffer;
     int32_t bufferIndex;
     int32_t bufferSize;

     RCEBuffer();
     ~RCEBuffer();

     UBool isEmpty() const;
     void  put(uint32_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode);
     const RCEI *get();
 };

 RCEBuffer::RCEBuffer()
 {
     buffer = defaultBuffer;
     bufferIndex = 0;
     bufferSize = UPRV_LENGTHOF(defaultBuffer);
 }

 RCEBuffer::~RCEBuffer()
 {
     if (buffer != defaultBuffer) {
         DELETE_ARRAY(buffer);
     }
 }

 UBool RCEBuffer::isEmpty() const
 {
     return bufferIndex <= 0;
 }

 void RCEBuffer::put(uint32_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode)
 {
     if (U_FAILURE(errorCode)) {
         return;
     }
     if (bufferIndex >= bufferSize) {
         RCEI *newBuffer = NEW_ARRAY(RCEI, bufferSize + BUFFER_GROW);
         if (newBuffer == NULL) {
             errorCode = U_MEMORY_ALLOCATION_ERROR;
             return;
         }

         ARRAY_COPY(newBuffer, buffer, bufferSize);

         if (buffer != defaultBuffer) {
             DELETE_ARRAY(buffer);
         }

         buffer = newBuffer;
         bufferSize += BUFFER_GROW;
     }

     buffer[bufferIndex].ce   = ce;
     buffer[bufferIndex].low  = ixLow;
     buffer[bufferIndex].high = ixHigh;

     bufferIndex += 1;
 }

 const RCEI *RCEBuffer::get()
 {
     if (bufferIndex > 0) {
      return &buffer[--bufferIndex];
     }

     return NULL;
 }

 PCEBuffer::PCEBuffer()
 {
     buffer = defaultBuffer;
     bufferIndex = 0;
     bufferSize = UPRV_LENGTHOF(defaultBuffer);
 }

 PCEBuffer::~PCEBuffer()
 {
     if (buffer != defaultBuffer) {
         DELETE_ARRAY(buffer);
     }
 }

 void PCEBuffer::reset()
 {
     bufferIndex = 0;
 }

 UBool PCEBuffer::isEmpty() const
 {
     return bufferIndex <= 0;
 }

 void PCEBuffer::put(uint64_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode)
 {
     if (U_FAILURE(errorCode)) {
         return;
     }
     if (bufferIndex >= bufferSize) {
         PCEI *newBuffer = NEW_ARRAY(PCEI, bufferSize + BUFFER_GROW);
         if (newBuffer == NULL) {
             errorCode = U_MEMORY_ALLOCATION_ERROR;
             return;
         }

         ARRAY_COPY(newBuffer, buffer, bufferSize);

         if (buffer != defaultBuffer) {
             DELETE_ARRAY(buffer);
         }

         buffer = newBuffer;
         bufferSize += BUFFER_GROW;
     }

     buffer[bufferIndex].ce   = ce;
     buffer[bufferIndex].low  = ixLow;
     buffer[bufferIndex].high = ixHigh;

     bufferIndex += 1;
 }

 const PCEI *PCEBuffer::get()
 {
     if (bufferIndex > 0) {
      return &buffer[--bufferIndex];
     }

     return NULL;
 }

 UCollationPCE::UCollationPCE(UCollationElements *elems) { init(elems); }

 UCollationPCE::UCollationPCE(CollationElementIterator *iter) { init(iter); }

 void UCollationPCE::init(UCollationElements *elems) {
     init(CollationElementIterator::fromUCollationElements(elems));
 }

 void UCollationPCE::init(CollationElementIterator *iter)
 {
     cei = iter;
     init(*iter->rbc_);
 }

 void UCollationPCE::init(const Collator &coll)
 {
     UErrorCode status = U_ZERO_ERROR;

     strength    = coll.getAttribute(UCOL_STRENGTH, status);
     toShift     = coll.getAttribute(UCOL_ALTERNATE_HANDLING, status) == UCOL_SHIFTED;
     isShifted   = FALSE;
     variableTop = coll.getVariableTop(status);
 }

 UCollationPCE::~UCollationPCE()
 {
     // nothing to do
 }

 uint64_t UCollationPCE::processCE(uint32_t ce)
 {
     uint64_t primary = 0, secondary = 0, tertiary = 0, quaternary = 0;

     // This is clean, but somewhat slow...
     // We could apply the mask to ce and then
     // just get all three orders...
     switch(strength) {
     default:
         tertiary = ucol_tertiaryOrder(ce);
         /* note fall-through */

     case UCOL_SECONDARY:
         secondary = ucol_secondaryOrder(ce);
         /* note fall-through */

     case UCOL_PRIMARY:
         primary = ucol_primaryOrder(ce);
     }

     // **** This should probably handle continuations too.  ****
     // **** That means that we need 24 bits for the primary ****
     // **** instead of the 16 that we're currently using.   ****
     // **** So we can lay out the 64 bits as: 24.12.12.16.  ****
     // **** Another complication with continuations is that ****
     // **** the *second* CE is marked as a continuation, so ****
     // **** we always have to peek ahead to know how long   ****
     // **** the primary is...                               ****
     if ((toShift && variableTop > ce && primary != 0)
                 || (isShifted && primary == 0)) {

         if (primary == 0) {
             return UCOL_IGNORABLE;
         }

         if (strength >= UCOL_QUATERNARY) {
             quaternary = primary;
         }

         primary = secondary = tertiary = 0;
         isShifted = TRUE;
     } else {
         if (strength >= UCOL_QUATERNARY) {
             quaternary = 0xFFFF;
         }

         isShifted = FALSE;
     }

     return primary << 48 | secondary << 32 | tertiary << 16 | quaternary;
 }

 U_NAMESPACE_END

 /* public methods ---------------------------------------------------- */

 U_CAPI UCollationElements* U_EXPORT2
 ucol_openElements(const UCollator  *coll,
                   const UChar      *text,
                         int32_t    textLength,
                         UErrorCode *status)
 {
     if (U_FAILURE(*status)) {
         return NULL;
     }
     if (coll == NULL || (text == NULL && textLength != 0)) {
         *status = U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     const RuleBasedCollator *rbc = RuleBasedCollator::rbcFromUCollator(coll);
     if (rbc == NULL) {
         *status = U_UNSUPPORTED_ERROR;  // coll is a Collator but not a RuleBasedCollator
         return NULL;
     }

     UnicodeString s((UBool)(textLength < 0), text, textLength);
     CollationElementIterator *cei = rbc->createCollationElementIterator(s);
     if (cei == NULL) {
         *status = U_MEMORY_ALLOCATION_ERROR;
         return NULL;
     }

     return cei->toUCollationElements();
 }


 U_CAPI void U_EXPORT2
 ucol_closeElements(UCollationElements *elems)
 {
     delete CollationElementIterator::fromUCollationElements(elems);
 }

 U_CAPI void U_EXPORT2
 ucol_reset(UCollationElements *elems)
 {
     CollationElementIterator::fromUCollationElements(elems)->reset();
 }

 U_CAPI int32_t U_EXPORT2
 ucol_next(UCollationElements *elems,
           UErrorCode         *status)
 {
     if (U_FAILURE(*status)) {
         return UCOL_NULLORDER;
     }

     return CollationElementIterator::fromUCollationElements(elems)->next(*status);
 }

 U_NAMESPACE_BEGIN

 int64_t
 UCollationPCE::nextProcessed(
                    int32_t            *ixLow,
                    int32_t            *ixHigh,
                    UErrorCode         *status)
 {
     int64_t result = UCOL_IGNORABLE;
     uint32_t low = 0, high = 0;

     if (U_FAILURE(*status)) {
         return UCOL_PROCESSED_NULLORDER;
     }

     pceBuffer.reset();

     do {
         low = cei->getOffset();
         int32_t ce = cei->next(*status);
         high = cei->getOffset();

         if (ce == UCOL_NULLORDER) {
              result = UCOL_PROCESSED_NULLORDER;
              break;
         }

         result = processCE((uint32_t)ce);
     } while (result == UCOL_IGNORABLE);

     if (ixLow != NULL) {
         *ixLow = low;
     }

     if (ixHigh != NULL) {
         *ixHigh = high;
     }

     return result;
 }

 U_NAMESPACE_END

 U_CAPI int32_t U_EXPORT2
 ucol_previous(UCollationElements *elems,
               UErrorCode         *status)
 {
     if(U_FAILURE(*status)) {
         return UCOL_NULLORDER;
     }
     return CollationElementIterator::fromUCollationElements(elems)->previous(*status);
 }

 U_NAMESPACE_BEGIN

 int64_t
 UCollationPCE::previousProcessed(
                    int32_t            *ixLow,
                    int32_t            *ixHigh,
                    UErrorCode         *status)
 {
     int64_t result = UCOL_IGNORABLE;
     int32_t  low = 0, high = 0;

     if (U_FAILURE(*status)) {
         return UCOL_PROCESSED_NULLORDER;
     }

     // pceBuffer.reset();

     while (pceBuffer.isEmpty()) {
         // buffer raw CEs up to non-ignorable primary
         RCEBuffer rceb;
         int32_t ce;

         // **** do we need to reset rceb, or will it always be empty at this point ****
         do {
             high = cei->getOffset();
             ce   = cei->previous(*status);
             low  = cei->getOffset();

             if (ce == UCOL_NULLORDER) {
                 if (!rceb.isEmpty()) {
                     break;
                 }

                 goto finish;
             }

             rceb.put((uint32_t)ce, low, high, *status);
         } while (U_SUCCESS(*status) && ((ce & UCOL_PRIMARYORDERMASK) == 0 || isContinuation(ce)));

         // process the raw CEs
         while (U_SUCCESS(*status) && !rceb.isEmpty()) {
             const RCEI *rcei = rceb.get();

             result = processCE(rcei->ce);

             if (result != UCOL_IGNORABLE) {
                 pceBuffer.put(result, rcei->low, rcei->high, *status);
             }
         }
         if (U_FAILURE(*status)) {
             return UCOL_PROCESSED_NULLORDER;
         }
     }

 finish:
     if (pceBuffer.isEmpty()) {
         // **** Is -1 the right value for ixLow, ixHigh? ****
     	if (ixLow != NULL) {
     		*ixLow = -1;
     	}

     	if (ixHigh != NULL) {
     		*ixHigh = -1
     		;
     	}
         return UCOL_PROCESSED_NULLORDER;
     }

     const PCEI *pcei = pceBuffer.get();

     if (ixLow != NULL) {
         *ixLow = pcei->low;
     }

     if (ixHigh != NULL) {
         *ixHigh = pcei->high;
     }

     return pcei->ce;
 }

 U_NAMESPACE_END

 U_CAPI int32_t U_EXPORT2
 ucol_getMaxExpansion(const UCollationElements *elems,
                            int32_t            order)
 {
     return CollationElementIterator::fromUCollationElements(elems)->getMaxExpansion(order);

     // TODO: The old code masked the order according to strength and then did a binary search.
     // However this was probably at least partially broken because of the following comment.
     // Still, it might have found a match when this version may not.

     // FIXME: with a masked search, there might be more than one hit,
     // so we need to look forward and backward from the match to find all
     // of the hits...
 }

 U_CAPI void U_EXPORT2
 ucol_setText(      UCollationElements *elems,
              const UChar              *text,
                    int32_t            textLength,
                    UErrorCode         *status)
 {
     if (U_FAILURE(*status)) {
         return;
     }

     if ((text == NULL && textLength != 0)) {
         *status = U_ILLEGAL_ARGUMENT_ERROR;
         return;
     }
     UnicodeString s((UBool)(textLength < 0), text, textLength);
     return CollationElementIterator::fromUCollationElements(elems)->setText(s, *status);
 }

 U_CAPI int32_t U_EXPORT2
 ucol_getOffset(const UCollationElements *elems)
 {
     return CollationElementIterator::fromUCollationElements(elems)->getOffset();
 }

 U_CAPI void U_EXPORT2
 ucol_setOffset(UCollationElements    *elems,
                int32_t           offset,
                UErrorCode            *status)
 {
     if (U_FAILURE(*status)) {
         return;
     }

     CollationElementIterator::fromUCollationElements(elems)->setOffset(offset, *status);
 }

 U_CAPI int32_t U_EXPORT2
 ucol_primaryOrder (int32_t order)
 {
     return (order >> 16) & 0xffff;
 }

 U_CAPI int32_t U_EXPORT2
 ucol_secondaryOrder (int32_t order)
 {
     return (order >> 8) & 0xff;
 }

 U_CAPI int32_t U_EXPORT2
 ucol_tertiaryOrder (int32_t order)
 {
     return order & 0xff;
 }

 #endif /* #if !UCONFIG_NO_COLLATION */
	/*
	******************************************************************************
	* Copyright (C) 2001-2015, International Business Machines
	* Corporation and others. All Rights Reserved.
	******************************************************************************
	*
	* File ucoleitr.cpp
	*
	* Modification History:
	*
	* Date Name Description
	* 02/15/2001 synwee Modified all methods to process its own function
	* instead of calling the equivalent c++ api (coleitr.h)
	* 2012-2014 markus Rewritten in C++ again.
	******************************************************************************/

	#include "unicode/utypes.h"

	#if !UCONFIG_NO_COLLATION

	#include "starboard/client_porting/poem/string_poem.h"
	#include "unicode/coleitr.h"
	#include "unicode/tblcoll.h"
	#include "unicode/ucoleitr.h"
	#include "unicode/ustring.h"
	#include "unicode/sortkey.h"
	#include "unicode/uobject.h"
	#include "cmemory.h"
	#include "usrchimp.h"

	U_NAMESPACE_USE

	#define BUFFER_LENGTH 100

	#define DEFAULT_BUFFER_SIZE 16
	#define BUFFER_GROW 8

	#define ARRAY_COPY(dst, src, count) uprv_memcpy((void ) (dst), (void ) (src), (count) * sizeof (src)[0])

	#define NEW_ARRAY(type, count) (type ) uprv_malloc((count) sizeof(type))

	#define DELETE_ARRAY(array) uprv_free((void *) (array))

	struct RCEI
	{
	uint32_t ce;
	int32_t low;
	int32_t high;
	};

	U_NAMESPACE_BEGIN

	struct RCEBuffer
	{
	RCEI defaultBuffer[DEFAULT_BUFFER_SIZE];
	RCEI *buffer;
	int32_t bufferIndex;
	int32_t bufferSize;

	RCEBuffer();
	~RCEBuffer();

	UBool isEmpty() const;
	void put(uint32_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode);
	const RCEI *get();
	};

	RCEBuffer::RCEBuffer()
	{
	buffer = defaultBuffer;
	bufferIndex = 0;
	bufferSize = UPRV_LENGTHOF(defaultBuffer);
	}

	RCEBuffer::~RCEBuffer()
	{
	if (buffer != defaultBuffer) {
	DELETE_ARRAY(buffer);
	}
	}

	UBool RCEBuffer::isEmpty() const
	{
	return bufferIndex <= 0;
	}

	void RCEBuffer::put(uint32_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode)
	{
	if (U_FAILURE(errorCode)) {
	return;
	}
	if (bufferIndex >= bufferSize) {
	RCEI *newBuffer = NEW_ARRAY(RCEI, bufferSize + BUFFER_GROW);
	if (newBuffer == NULL) {
	errorCode = U_MEMORY_ALLOCATION_ERROR;
	return;
	}

	ARRAY_COPY(newBuffer, buffer, bufferSize);

	if (buffer != defaultBuffer) {
	DELETE_ARRAY(buffer);
	}

	buffer = newBuffer;
	bufferSize += BUFFER_GROW;
	}

	buffer[bufferIndex].ce = ce;
	buffer[bufferIndex].low = ixLow;
	buffer[bufferIndex].high = ixHigh;

	bufferIndex += 1;
	}

	const RCEI *RCEBuffer::get()
	{
	if (bufferIndex > 0) {
	return &buffer[--bufferIndex];
	}

	return NULL;
	}

	PCEBuffer::PCEBuffer()
	{
	buffer = defaultBuffer;
	bufferIndex = 0;
	bufferSize = UPRV_LENGTHOF(defaultBuffer);
	}

	PCEBuffer::~PCEBuffer()
	{
	if (buffer != defaultBuffer) {
	DELETE_ARRAY(buffer);
	}
	}

	void PCEBuffer::reset()
	{
	bufferIndex = 0;
	}

	UBool PCEBuffer::isEmpty() const
	{
	return bufferIndex <= 0;
	}

	void PCEBuffer::put(uint64_t ce, int32_t ixLow, int32_t ixHigh, UErrorCode &errorCode)
	{
	if (U_FAILURE(errorCode)) {
	return;
	}
	if (bufferIndex >= bufferSize) {
	PCEI *newBuffer = NEW_ARRAY(PCEI, bufferSize + BUFFER_GROW);
	if (newBuffer == NULL) {
	errorCode = U_MEMORY_ALLOCATION_ERROR;
	return;
	}

	ARRAY_COPY(newBuffer, buffer, bufferSize);

	if (buffer != defaultBuffer) {
	DELETE_ARRAY(buffer);
	}

	buffer = newBuffer;
	bufferSize += BUFFER_GROW;
	}

	buffer[bufferIndex].ce = ce;
	buffer[bufferIndex].low = ixLow;
	buffer[bufferIndex].high = ixHigh;

	bufferIndex += 1;
	}

	const PCEI *PCEBuffer::get()
	{
	if (bufferIndex > 0) {
	return &buffer[--bufferIndex];
	}

	return NULL;
	}

	UCollationPCE::UCollationPCE(UCollationElements *elems) { init(elems); }

	UCollationPCE::UCollationPCE(CollationElementIterator *iter) { init(iter); }

	void UCollationPCE::init(UCollationElements *elems) {
	init(CollationElementIterator::fromUCollationElements(elems));
	}

	void UCollationPCE::init(CollationElementIterator *iter)
	{
	cei = iter;
	init(*iter->rbc_);
	}

	void UCollationPCE::init(const Collator &coll)
	{
	UErrorCode status = U_ZERO_ERROR;

	strength = coll.getAttribute(UCOL_STRENGTH, status);
	toShift = coll.getAttribute(UCOL_ALTERNATE_HANDLING, status) == UCOL_SHIFTED;
	isShifted = FALSE;
	variableTop = coll.getVariableTop(status);
	}

	UCollationPCE::~UCollationPCE()
	{
	// nothing to do
	}

	uint64_t UCollationPCE::processCE(uint32_t ce)
	{
	uint64_t primary = 0, secondary = 0, tertiary = 0, quaternary = 0;

	// This is clean, but somewhat slow...
	// We could apply the mask to ce and then
	// just get all three orders...
	switch(strength) {
	default:
	tertiary = ucol_tertiaryOrder(ce);
	/* note fall-through */

	case UCOL_SECONDARY:
	secondary = ucol_secondaryOrder(ce);
	/* note fall-through */

	case UCOL_PRIMARY:
	primary = ucol_primaryOrder(ce);
	}

	// ** This should probably handle continuations too. **
	// ** That means that we need 24 bits for the primary **
	// ** instead of the 16 that we're currently using. **
	// ** So we can lay out the 64 bits as: 24.12.12.16. **
	// ** Another complication with continuations is that **
	// **** the second CE is marked as a continuation, so ****
	// ** we always have to peek ahead to know how long **
	// ** the primary is... **
	if ((toShift && variableTop > ce && primary != 0)
	\|\| (isShifted && primary == 0)) {

	if (primary == 0) {
	return UCOL_IGNORABLE;
	}

	if (strength >= UCOL_QUATERNARY) {
	quaternary = primary;
	}

	primary = secondary = tertiary = 0;
	isShifted = TRUE;
	} else {
	if (strength >= UCOL_QUATERNARY) {
	quaternary = 0xFFFF;
	}

	isShifted = FALSE;
	}

	return primary << 48 \| secondary << 32 \| tertiary << 16 \| quaternary;
	}

	U_NAMESPACE_END

	/* public methods ---------------------------------------------------- */

	U_CAPI UCollationElements* U_EXPORT2
	ucol_openElements(const UCollator *coll,
	const UChar *text,
	int32_t textLength,
	UErrorCode *status)
	{
	if (U_FAILURE(*status)) {
	return NULL;
	}
	if (coll == NULL \|\| (text == NULL && textLength != 0)) {
	*status = U_ILLEGAL_ARGUMENT_ERROR;
	return NULL;
	}
	const RuleBasedCollator *rbc = RuleBasedCollator::rbcFromUCollator(coll);
	if (rbc == NULL) {
	*status = U_UNSUPPORTED_ERROR; // coll is a Collator but not a RuleBasedCollator
	return NULL;
	}

	UnicodeString s((UBool)(textLength < 0), text, textLength);
	CollationElementIterator *cei = rbc->createCollationElementIterator(s);
	if (cei == NULL) {
	*status = U_MEMORY_ALLOCATION_ERROR;
	return NULL;
	}

	return cei->toUCollationElements();
	}


	U_CAPI void U_EXPORT2
	ucol_closeElements(UCollationElements *elems)
	{
	delete CollationElementIterator::fromUCollationElements(elems);
	}

	U_CAPI void U_EXPORT2
	ucol_reset(UCollationElements *elems)
	{
	CollationElementIterator::fromUCollationElements(elems)->reset();
	}

	U_CAPI int32_t U_EXPORT2
	ucol_next(UCollationElements *elems,
	UErrorCode *status)
	{
	if (U_FAILURE(*status)) {
	return UCOL_NULLORDER;
	}

	return CollationElementIterator::fromUCollationElements(elems)->next(*status);
	}

	U_NAMESPACE_BEGIN

	int64_t
	UCollationPCE::nextProcessed(
	int32_t *ixLow,
	int32_t *ixHigh,
	UErrorCode *status)
	{
	int64_t result = UCOL_IGNORABLE;
	uint32_t low = 0, high = 0;

	if (U_FAILURE(*status)) {
	return UCOL_PROCESSED_NULLORDER;
	}

	pceBuffer.reset();

	do {
	low = cei->getOffset();
	int32_t ce = cei->next(*status);
	high = cei->getOffset();

	if (ce == UCOL_NULLORDER) {
	result = UCOL_PROCESSED_NULLORDER;
	break;
	}

	result = processCE((uint32_t)ce);
	} while (result == UCOL_IGNORABLE);

	if (ixLow != NULL) {
	*ixLow = low;
	}

	if (ixHigh != NULL) {
	*ixHigh = high;
	}

	return result;
	}

	U_NAMESPACE_END

	U_CAPI int32_t U_EXPORT2
	ucol_previous(UCollationElements *elems,
	UErrorCode *status)
	{
	if(U_FAILURE(*status)) {
	return UCOL_NULLORDER;
	}
	return CollationElementIterator::fromUCollationElements(elems)->previous(*status);
	}

	U_NAMESPACE_BEGIN

	int64_t
	UCollationPCE::previousProcessed(
	int32_t *ixLow,
	int32_t *ixHigh,
	UErrorCode *status)
	{
	int64_t result = UCOL_IGNORABLE;
	int32_t low = 0, high = 0;

	if (U_FAILURE(*status)) {
	return UCOL_PROCESSED_NULLORDER;
	}

	// pceBuffer.reset();

	while (pceBuffer.isEmpty()) {
	// buffer raw CEs up to non-ignorable primary
	RCEBuffer rceb;
	int32_t ce;

	// ** do we need to reset rceb, or will it always be empty at this point **
	do {
	high = cei->getOffset();
	ce = cei->previous(*status);
	low = cei->getOffset();

	if (ce == UCOL_NULLORDER) {
	if (!rceb.isEmpty()) {
	break;
	}

	goto finish;
	}

	rceb.put((uint32_t)ce, low, high, *status);
	} while (U_SUCCESS(*status) && ((ce & UCOL_PRIMARYORDERMASK) == 0 \|\| isContinuation(ce)));

	// process the raw CEs
	while (U_SUCCESS(*status) && !rceb.isEmpty()) {
	const RCEI *rcei = rceb.get();

	result = processCE(rcei->ce);

	if (result != UCOL_IGNORABLE) {
	pceBuffer.put(result, rcei->low, rcei->high, *status);
	}
	}
	if (U_FAILURE(*status)) {
	return UCOL_PROCESSED_NULLORDER;
	}
	}

	finish:
	if (pceBuffer.isEmpty()) {
	// ** Is -1 the right value for ixLow, ixHigh? **
	if (ixLow != NULL) {
	*ixLow = -1;
	}

	if (ixHigh != NULL) {
	*ixHigh = -1
	;
	}
	return UCOL_PROCESSED_NULLORDER;
	}

	const PCEI *pcei = pceBuffer.get();

	if (ixLow != NULL) {
	*ixLow = pcei->low;
	}

	if (ixHigh != NULL) {
	*ixHigh = pcei->high;
	}

	return pcei->ce;
	}

	U_NAMESPACE_END

	U_CAPI int32_t U_EXPORT2
	ucol_getMaxExpansion(const UCollationElements *elems,
	int32_t order)
	{
	return CollationElementIterator::fromUCollationElements(elems)->getMaxExpansion(order);

	// TODO: The old code masked the order according to strength and then did a binary search.
	// However this was probably at least partially broken because of the following comment.
	// Still, it might have found a match when this version may not.

	// FIXME: with a masked search, there might be more than one hit,
	// so we need to look forward and backward from the match to find all
	// of the hits...
	}

	U_CAPI void U_EXPORT2
	ucol_setText( UCollationElements *elems,
	const UChar *text,
	int32_t textLength,
	UErrorCode *status)
	{
	if (U_FAILURE(*status)) {
	return;
	}

	if ((text == NULL && textLength != 0)) {
	*status = U_ILLEGAL_ARGUMENT_ERROR;
	return;
	}
	UnicodeString s((UBool)(textLength < 0), text, textLength);
	return CollationElementIterator::fromUCollationElements(elems)->setText(s, *status);
	}

	U_CAPI int32_t U_EXPORT2
	ucol_getOffset(const UCollationElements *elems)
	{
	return CollationElementIterator::fromUCollationElements(elems)->getOffset();
	}

	U_CAPI void U_EXPORT2
	ucol_setOffset(UCollationElements *elems,
	int32_t offset,
	UErrorCode *status)
	{
	if (U_FAILURE(*status)) {
	return;
	}

	CollationElementIterator::fromUCollationElements(elems)->setOffset(offset, *status);
	}

	U_CAPI int32_t U_EXPORT2
	ucol_primaryOrder (int32_t order)
	{
	return (order >> 16) & 0xffff;
	}

	U_CAPI int32_t U_EXPORT2
	ucol_secondaryOrder (int32_t order)
	{
	return (order >> 8) & 0xff;
	}

	U_CAPI int32_t U_EXPORT2
	ucol_tertiaryOrder (int32_t order)
	{
	return order & 0xff;
	}

	#endif /* #if !UCONFIG_NO_COLLATION */