399 lines
10 KiB
C
399 lines
10 KiB
C
/*
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*****************************************************************************************
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*
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* Copyright (C) 1997-1999, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*****************************************************************************************
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*/
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/*===============================================================================
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*
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* File cmpshrta.cpp
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*
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* Modification History:
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*
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* Date Name Description
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* 2/5/97 aliu Added CompactIntArray streamIn and streamOut methods.
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* 3/4/97 aliu Tuned performance of CompactIntArray constructor,
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* 05/07/97 helena Added isBogus()
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* based on performance data indicating that this was slow.
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* 07/15/98 erm Synched with Java 1.2 CompactShortArray.java.
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* 07/30/98 erm Added changes from 07/29/98 code review.
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*===============================================================================
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*/
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#include "ucmp16.h"
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#include "cmemory.h"
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#define arrayRegionMatches(source, sourceStart, target, targetStart, len) (uprv_memcmp(&source[sourceStart], &target[targetStart], len * sizeof(int16_t)) != 0)
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/* internal constants*/
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#define UCMP16_kMaxUnicode_int 65535
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#define UCMP16_kUnicodeCount_int (UCMP16_kMaxUnicode_int + 1)
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#define UCMP16_kBlockShift_int 7
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#define UCMP16_kBlockCount_int (1 << UCMP16_kBlockShift_int)
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#define UCMP16_kBlockBytes_int (UCMP16_kBlockCount_int * sizeof(int16_t))
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#define UCMP16_kIndexShift_int (16 - UCMP16_kBlockShift_int)
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#define UCMP16_kIndexCount_int (1 << UCMP16_kIndexShift_int)
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#define UCMP16_kBlockMask_int (UCMP16_kBlockCount_int - 1)
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const int32_t UCMP16_kMaxUnicode = UCMP16_kMaxUnicode_int;
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const int32_t UCMP16_kUnicodeCount = UCMP16_kUnicodeCount_int;
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const int32_t UCMP16_kBlockShift = UCMP16_kBlockShift_int;
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const int32_t UCMP16_kBlockCount = UCMP16_kBlockCount_int;
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const int32_t UCMP16_kBlockBytes = UCMP16_kBlockBytes_int;
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const int32_t UCMP16_kIndexShift = UCMP16_kIndexShift_int;
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const int32_t UCMP16_kIndexCount = UCMP16_kIndexCount_int;
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const uint32_t UCMP16_kBlockMask = UCMP16_kBlockMask_int;
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/**
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* Sets the array to the invalid memory state.
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*/
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static CompactShortArray* setToBogus(CompactShortArray* array);
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static void touchBlock(CompactShortArray* this,
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int32_t i,
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int16_t value);
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static UBool blockTouched(const CompactShortArray* this,
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int32_t i);
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/* debug flags*/
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/*=======================================================*/
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int32_t ucmp16_getkUnicodeCount()
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{return UCMP16_kUnicodeCount;}
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int32_t ucmp16_getkBlockCount()
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{return UCMP16_kBlockCount;}
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int32_t ucmp16_getkIndexCount()
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{ return UCMP16_kIndexCount;}
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CompactShortArray* ucmp16_open(int16_t defaultValue)
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{
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int32_t i;
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CompactShortArray* this = (CompactShortArray*) uprv_malloc(sizeof(CompactShortArray));
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if (this == NULL) return NULL;
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this->fCount = UCMP16_kUnicodeCount;
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this->fCompact = FALSE;
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this->fBogus = FALSE;
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this->fArray = NULL;
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this->fIndex = NULL;
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this->fHashes = NULL;
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this->fDefaultValue = defaultValue;
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this->fArray = (int16_t*)uprv_malloc(UCMP16_kUnicodeCount * sizeof(int16_t));
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if (this->fArray == NULL)
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{
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this->fBogus = TRUE;
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return NULL;
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}
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this->fIndex = (uint16_t*)uprv_malloc(UCMP16_kIndexCount * sizeof(uint16_t));
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if (this->fIndex == NULL)
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{
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uprv_free(this->fArray);
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this->fArray = NULL;
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this->fBogus = TRUE;
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return NULL;
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}
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this->kBlockShift = UCMP16_kBlockShift;
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this->kBlockMask = UCMP16_kBlockMask;
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for (i = 0; i < UCMP16_kUnicodeCount; i += 1)
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{
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this->fArray[i] = defaultValue;
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}
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this->fHashes =(int32_t*)uprv_malloc(UCMP16_kIndexCount * sizeof(int32_t));
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if (this->fHashes == NULL)
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{
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uprv_free(this->fArray);
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uprv_free(this->fIndex);
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this->fBogus = TRUE;
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return NULL;
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}
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for (i = 0; i < UCMP16_kIndexCount; i += 1)
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{
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this->fIndex[i] = (uint16_t)(i << UCMP16_kBlockShift);
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this->fHashes[i] = 0;
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}
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return this;
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}
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CompactShortArray* ucmp16_openAdopt(uint16_t *indexArray,
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int16_t *newValues,
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int32_t count,
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int16_t defaultValue)
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{
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CompactShortArray* this = (CompactShortArray*) uprv_malloc(sizeof(CompactShortArray));
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if (this == NULL) return NULL;
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this->fHashes = NULL;
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this->fCount = count;
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this->fDefaultValue = defaultValue;
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this->fBogus = FALSE;
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this->fArray = newValues;
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this->fIndex = indexArray;
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this->fCompact = count < UCMP16_kUnicodeCount;
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this->kBlockShift = UCMP16_kBlockShift;
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this->kBlockMask = UCMP16_kBlockMask;
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return this;
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}
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CompactShortArray* ucmp16_openAdoptWithBlockShift(uint16_t *indexArray,
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int16_t *newValues,
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int32_t count,
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int16_t defaultValue,
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int32_t blockShift)
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{
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CompactShortArray* this = ucmp16_openAdopt(indexArray,
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newValues,
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count,
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defaultValue);
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if (this == NULL) return NULL;
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this->kBlockShift = blockShift;
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this->kBlockMask = (uint32_t) (((uint32_t)1 << (uint32_t)blockShift) - (uint32_t)1);
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return this;
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}
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/*=======================================================*/
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void ucmp16_close(CompactShortArray* this)
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{
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uprv_free(this->fArray);
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uprv_free(this->fIndex);
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uprv_free(this->fHashes);
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uprv_free(this);
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return;
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}
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CompactShortArray* setToBogus(CompactShortArray* this)
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{
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uprv_free(this->fArray);
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this->fArray = NULL;
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uprv_free(this->fIndex);
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this->fIndex = NULL;
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uprv_free(this->fHashes);
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this->fHashes = NULL;
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this->fCount = 0;
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this->fCompact = FALSE;
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this->fBogus = TRUE;
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return this;
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}
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void ucmp16_expand(CompactShortArray* this)
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{
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if (this->fCompact)
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{
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int32_t i;
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int16_t *tempArray = (int16_t*)uprv_malloc(UCMP16_kUnicodeCount * sizeof(int16_t));
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if (tempArray == NULL)
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{
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this->fBogus = TRUE;
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return;
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}
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for (i = 0; i < UCMP16_kUnicodeCount; i += 1)
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{
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tempArray[i] = ucmp16_get(this, (UChar)i); /* HSYS : How expand?*/
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}
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for (i = 0; i < (1 << (16 - this->kBlockShift)); i += 1)
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{
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this->fIndex[i] = (uint16_t)(i<<this->kBlockShift);
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}
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uprv_free(this->fArray);
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this->fArray = tempArray;
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this->fCompact = FALSE;
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}
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}
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void ucmp16_set(CompactShortArray* this,
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UChar c,
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int16_t value)
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{
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if (this->fCompact)
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{
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ucmp16_expand(this);
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if (this->fBogus) return;
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}
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this->fArray[(int32_t)c] = value;
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if (value != this->fDefaultValue)
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{
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touchBlock(this, c >> this->kBlockShift, value);
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}
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}
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void ucmp16_setRange(CompactShortArray* this,
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UChar start,
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UChar end,
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int16_t value)
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{
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int32_t i;
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if (this->fCompact)
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{
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ucmp16_expand(this);
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if (this->fBogus) return;
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}
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if (value != this->fDefaultValue)
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{
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for (i = start; i <= end; i += 1)
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{
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this->fArray[i] = value;
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touchBlock(this, i >> this->kBlockShift, value);
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}
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}
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else
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{
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for (i = start; i <= end; i += 1) this->fArray[i] = value;
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}
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}
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/*=======================================================*/
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void ucmp16_compact(CompactShortArray* this)
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{
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if (!this->fCompact)
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{
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int32_t limitCompacted = 0;
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int32_t i, iBlockStart;
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int16_t iUntouched = -1;
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for (i = 0, iBlockStart = 0; i < (1 << (16 - this->kBlockShift)); i += 1, iBlockStart += (1 << this->kBlockShift))
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{
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UBool touched = blockTouched(this, i);
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this->fIndex[i] = 0xFFFF;
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if (!touched && iUntouched != -1)
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{
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/* If no values in this block were set, we can just set its
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* index to be the same as some other block with no values
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* set, assuming we've seen one yet.
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*/
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this->fIndex[i] = iUntouched;
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}
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else
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{
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int32_t j, jBlockStart;
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for (j = 0, jBlockStart = 0;
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j < limitCompacted;
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j += 1, jBlockStart += (1 << this->kBlockShift))
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{
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if (this->fHashes[i] == this->fHashes[j] &&
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arrayRegionMatches(this->fArray,
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iBlockStart,
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this->fArray,
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jBlockStart,
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(1 << this->kBlockShift)))
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{
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this->fIndex[i] = (int16_t)jBlockStart;
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}
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}
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/* TODO: verify this is correct*/
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if (this->fIndex[i] == 0xFFFF)
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{
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/* we didn't match, so copy & update*/
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uprv_memcpy(&(this->fArray[jBlockStart]),
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&(this->fArray[iBlockStart]),
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(1 << this->kBlockShift)*sizeof(int16_t));
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this->fIndex[i] = (int16_t)jBlockStart;
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this->fHashes[j] = this->fHashes[i];
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limitCompacted += 1;
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if (!touched)
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{
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/* If this is the first untouched block we've seen,*/
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/* remember its index.*/
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iUntouched = (int16_t)jBlockStart;
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}
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}
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}
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}
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/* we are done compacting, so now make the array shorter*/
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{
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int32_t newSize = limitCompacted * (1 << this->kBlockShift);
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int16_t *result = (int16_t*) uprv_malloc(sizeof(int16_t) * newSize);
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uprv_memcpy(result, this->fArray, newSize * sizeof(int16_t));
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uprv_free(this->fArray);
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this->fArray = result;
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this->fCount = newSize;
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uprv_free(this->fHashes);
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this->fHashes = NULL;
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this->fCompact = TRUE;
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}
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}
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}
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/**
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* Query whether a specified block was "touched", i.e. had a value set.
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* Untouched blocks can be skipped when compacting the array
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*/
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int16_t ucmp16_getDefaultValue(const CompactShortArray* this)
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{
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return this->fDefaultValue;
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}
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void touchBlock(CompactShortArray* this,
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int32_t i,
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int16_t value)
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{
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this->fHashes[i] = (this->fHashes[i] + (value << 1)) | 1;
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}
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UBool blockTouched(const CompactShortArray* this, int32_t i)
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{
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return (this->fHashes[i] != 0);
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}
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const int16_t*
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ucmp16_getArray(const CompactShortArray* this)
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{
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return this->fArray;
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}
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const uint16_t*
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ucmp16_getIndex(const CompactShortArray* this)
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{
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return this->fIndex;
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}
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uint32_t
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ucmp16_getCount(const CompactShortArray* this)
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{
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return this->fCount;
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}
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