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-
- /*
- ********************************************************************
- * COPYRIGHT:
- * (C) Copyright Taligent, Inc., 1997
- * (C) Copyright International Business Machines Corporation, 1997 - 1998
- * Licensed Material - Program-Property of IBM - All Rights Reserved.
- * US Government Users Restricted Rights - Use, duplication, or disclosure
- * restricted by GSA ADP Schedule Contract with IBM Corp.
- *
- ********************************************************************
- */
-
- #ifndef _STDLIB_H
- #include <stdlib.h>
- #endif
-
- #ifndef _STDIO_H
- #include <stdio.h>
- #endif
-
-
- #include "ucmp8.h"
- #include "cmemory.h"
-
- static int32_t findOverlappingPosition(CompactByteArray* this_obj,
- uint32_t start,
- const UChar *tempIndex,
- int32_t tempIndexCount,
- uint32_t cycle);
-
- /* internal constants*/
-
- #define kUnicodeCount_int 65536
- #define kBlockShift_int 7
- #define kBlockCount_int (1<<kBlockShift_int)
- #define kIndexShift_int (16-kBlockShift_int)
- #define kIndexCount_int (1<<kIndexShift_int)
- #define kBlockMask_int (kBlockCount_int-1)
-
- const int32_t UCMP8_kUnicodeCount = kUnicodeCount_int;
- const int32_t UCMP8_kBlockShift = kBlockShift_int;
- const int32_t UCMP8_kBlockCount = kBlockCount_int;
- const int32_t UCMP8_kIndexShift = kIndexShift_int;
- const int32_t UCMP8_kIndexCount = kIndexCount_int;
- const uint32_t UCMP8_kBlockMask = kBlockMask_int;
-
-
- int32_t ucmp8_getkUnicodeCount() { return UCMP8_kUnicodeCount;}
- int32_t ucmp8_getkBlockCount() { return UCMP8_kBlockCount;}
- /* debug flags*/
- /*=======================================================*/
- U_CAPI int8_t ucmp8_get(CompactByteArray* array, uint16_t index)
- {
- return (array->fArray[(array->fIndex[index >> UCMP8_kBlockShift] & 0xFFFF) + (index & UCMP8_kBlockMask)]);
- }
- U_CAPI uint8_t ucmp8_getu(CompactByteArray* array, uint16_t index)
- {
- return (uint8_t)ucmp8_get(array,index);
- }
-
- CompactByteArray* ucmp8_open(int8_t defaultValue)
- {
- /* set up the index array and the data array.
- * the index array always points into particular parts of the data array
- * it is initially set up to point at regular block boundaries
- * The following example uses blocks of 4 for simplicity
- * Example: Expanded
- * INDEX# 0 1 2 3 4
- * INDEX 0 4 8 12 16 ...
- * ARRAY abcdeababcedzyabcdea...
- * | | | | | |...
- * whenever you set an element in the array, it unpacks to this state
- * After compression, the index will point to various places in the data array
- * wherever there is a runs of the same elements as in the original
- * Example: Compressed
- * INDEX# 0 1 2 3 4
- * INDEX 0 4 1 8 2 ...
- * ARRAY abcdeabazyabc...
- * If you look at the example, index# 2 in the expanded version points
- * to data position number 8, which has elements "bced". In the compressed
- * version, index# 2 points to data position 1, which also has "bced"
- */
- CompactByteArray* this_obj = (CompactByteArray*) icu_malloc(sizeof(CompactByteArray));
- int32_t i;
-
- if (this_obj == NULL) return NULL;
-
- this_obj->fArray = NULL;
- this_obj->fIndex = NULL;
- this_obj->fCount = UCMP8_kUnicodeCount;
- this_obj->fCompact = FALSE;
- this_obj->fBogus = FALSE;
-
-
- this_obj->fArray = (int8_t*) icu_malloc(sizeof(int8_t) * UCMP8_kUnicodeCount);
- if (!this_obj->fArray)
- {
- this_obj->fBogus = TRUE;
- return NULL;
- }
- this_obj->fIndex = (uint16_t*) icu_malloc(sizeof(uint16_t) * UCMP8_kIndexCount);
- if (!this_obj->fIndex)
- {
- icu_free(this_obj->fArray);
- this_obj->fArray = NULL;
- this_obj->fBogus = TRUE;
- return NULL;
- }
- for (i = 0; i < UCMP8_kUnicodeCount; ++i)
- {
- this_obj->fArray[i] = defaultValue;
- }
- for (i = 0; i < UCMP8_kIndexCount; ++i)
- {
- this_obj->fIndex[i] = (uint16_t)(i << UCMP8_kBlockShift);
- }
-
- return this_obj;
- }
-
- CompactByteArray* ucmp8_openAdopt(uint16_t *indexArray,
- int8_t *newValues,
- int32_t count)
- {
- CompactByteArray* this_obj = (CompactByteArray*) icu_malloc(sizeof(CompactByteArray));
- if (!this_obj) return NULL;
-
- this_obj->fArray = NULL;
- this_obj->fIndex = NULL;
- this_obj->fCount = count;
- this_obj->fBogus = FALSE;
-
- this_obj->fArray = newValues;
- this_obj->fIndex = indexArray;
- this_obj->fCompact = (count < UCMP8_kUnicodeCount) ? TRUE : FALSE;
-
- return this_obj;
- }
-
- /*=======================================================*/
-
- void ucmp8_close(CompactByteArray* this_obj)
- {
- icu_free(this_obj->fArray);
- this_obj->fArray = NULL;
- icu_free(this_obj->fIndex);
- this_obj->fIndex = NULL;
- this_obj->fCount = 0;
- this_obj->fCompact = FALSE;
- icu_free(this_obj);
- }
-
-
- /*=======================================================*/
-
- void ucmp8_expand(CompactByteArray* this_obj)
- {
- /* can optimize later.
- * if we have to expand, then walk through the blocks instead of using Get
- * this code unpacks the array by copying the blocks to the normalized position.
- * Example: Compressed
- * INDEX# 0 1 2 3 4
- * INDEX 0 4 1 8 2 ...
- * ARRAY abcdeabazyabc...
- * turns into
- * Example: Expanded
- * INDEX# 0 1 2 3 4
- * INDEX 0 4 8 12 16 ...
- * ARRAY abcdeababcedzyabcdea...
- */
- int32_t i;
- if (this_obj->fCompact)
- {
- int8_t* tempArray;
- tempArray = (int8_t*) icu_malloc(sizeof(int8_t) * UCMP8_kUnicodeCount);
- if (!tempArray)
- {
- this_obj->fBogus = TRUE;
- return;
- }
- for (i = 0; i < UCMP8_kUnicodeCount; ++i)
- {
- tempArray[i] = ucmp8_get(this_obj,(UChar)i); /* HSYS : How expand?*/
- }
- for (i = 0; i < UCMP8_kIndexCount; ++i)
- {
- this_obj->fIndex[i] = (uint16_t)(i<< UCMP8_kBlockShift);
- }
- icu_free(this_obj->fArray);
- this_obj->fArray = tempArray;
- this_obj->fCompact = FALSE;
- }
- }
-
-
- /*=======================================================*/
- /* this_obj->fArray: an array to be overlapped
- * start and count: specify the block to be overlapped
- * tempIndex: the overlapped array (actually indices back into inputContents)
- * inputHash: an index of hashes for tempIndex, where
- * inputHash[i] = XOR of values from i-count+1 to i
- */
- int32_t
- findOverlappingPosition(CompactByteArray* this_obj,
- uint32_t start,
- const UChar* tempIndex,
- int32_t tempIndexCount,
- uint32_t cycle)
- {
- /* this_obj is a utility routine for finding blocks that overlap.
- * IMPORTANT: the cycle number is very important. Small cycles take a lot
- * longer to work. In some cases, they may be able to get better compaction.
- */
-
- int32_t i;
- int32_t j;
- int32_t currentCount;
-
- for (i = 0; i < tempIndexCount; i += cycle)
- {
- currentCount = UCMP8_kBlockCount;
- if (i + UCMP8_kBlockCount > tempIndexCount)
- {
- currentCount = tempIndexCount - i;
- }
- for (j = 0; j < currentCount; ++j)
- {
- if (this_obj->fArray[start + j] != this_obj->fArray[tempIndex[i + j]]) break;
- }
- if (j == currentCount) break;
- }
-
- return i;
- }
-
- bool_t
- ucmp8_isBogus(const CompactByteArray* this_obj)
- {
- return this_obj->fBogus;
- }
-
- const int8_t*
- ucmp8_getArray(const CompactByteArray* this_obj)
- {
- return this_obj->fArray;
- }
-
- const uint16_t*
- ucmp8_getIndex(const CompactByteArray* this_obj)
- {
- return this_obj->fIndex;
- }
-
- int32_t
- ucmp8_getCount(const CompactByteArray* this_obj)
- {
- return this_obj->fCount;
- }
-
-
- void
- ucmp8_set(CompactByteArray* this_obj,
- UChar c,
- int8_t value)
- {
- if (this_obj->fCompact == TRUE)
- {
- ucmp8_expand(this_obj);
- if (this_obj->fBogus) return;
- }
- this_obj->fArray[(int32_t)c] = value;
- }
-
-
- void
- ucmp8_setRange(CompactByteArray* this_obj,
- UChar start,
- UChar end,
- int8_t value)
- {
- int32_t i;
- if (this_obj->fCompact == TRUE)
- {
- ucmp8_expand(this_obj);
- if (this_obj->fBogus) return;
- }
- for (i = start; i <= end; ++i)
- {
- this_obj->fArray[i] = value;
- }
- }
-
-
- /*=======================================================*/
-
- void
- ucmp8_compact(CompactByteArray* this_obj,
- uint32_t cycle)
- {
- if (!this_obj->fCompact)
- {
- /* this_obj actually does the compaction.
- * it walks throught the contents of the expanded array, finding the
- * first block in the data that matches the contents of the current index.
- * As it works, it keeps an updated pointer to the last position,
- * so that it knows how big to make the final array
- * If the matching succeeds, then the index will point into the data
- * at some earlier position.
- * If the matching fails, then last position pointer will be bumped,
- * and the index will point to that last block of data.
- */
- UChar* tempIndex;
- int32_t tempIndexCount;
- int8_t* tempArray;
- int32_t iBlock, iIndex;
-
- /* fix cycle, must be 0 < cycle <= blockcount*/
- if (cycle < 0) cycle = 1;
- else if (cycle > (uint32_t)UCMP8_kBlockCount) cycle = UCMP8_kBlockCount;
-
- /* make temp storage, larger than we need*/
- tempIndex = (UChar*) icu_malloc(sizeof(UChar)* UCMP8_kUnicodeCount);
- if (!tempIndex)
- {
- this_obj->fBogus = TRUE;
- return;
- }
- /* set up first block.*/
- tempIndexCount = UCMP8_kBlockCount;
- for (iIndex = 0; iIndex < UCMP8_kBlockCount; ++iIndex)
- {
- tempIndex[iIndex] = (uint16_t)iIndex;
- }; /* endfor (iIndex = 0; .....)*/
- this_obj->fIndex[0] = 0;
-
- /* for each successive block, find out its first position in the compacted array*/
- for (iBlock = 1; iBlock < UCMP8_kIndexCount; ++iBlock)
- {
- int32_t newCount, firstPosition, block;
- block = iBlock << UCMP8_kBlockShift;
- /* if (debugSmall) if (block > debugSmallLimit) break;*/
- firstPosition = findOverlappingPosition(this_obj,
- block,
- tempIndex,
- tempIndexCount,
- cycle);
-
- /* if not contained in the current list, copy the remainder
- * invariant; cumulativeHash[iBlock] = XOR of values from iBlock-kBlockCount+1 to iBlock
- * we do this_obj by XORing out cumulativeHash[iBlock-kBlockCount]
- */
- newCount = firstPosition + UCMP8_kBlockCount;
- if (newCount > tempIndexCount)
- {
- for (iIndex = tempIndexCount; iIndex < newCount; ++iIndex)
- {
- tempIndex[iIndex] = (uint16_t)(iIndex - firstPosition + block);
- } /* endfor (iIndex = tempIndexCount....)*/
- tempIndexCount = newCount;
- } /* endif (newCount > tempIndexCount)*/
- this_obj->fIndex[iBlock] = (uint16_t)firstPosition;
- } /* endfor (iBlock = 1.....)*/
-
- /* now allocate and copy the items into the array*/
- tempArray = (int8_t*) icu_malloc(tempIndexCount * sizeof(int8_t));
- if (!tempArray)
- {
- this_obj->fBogus = TRUE;
- icu_free(tempIndex);
- return;
- }
- for (iIndex = 0; iIndex < tempIndexCount; ++iIndex)
- {
- tempArray[iIndex] = this_obj->fArray[tempIndex[iIndex]];
- }
- icu_free(this_obj->fArray);
- this_obj->fArray = tempArray;
- this_obj->fCount = tempIndexCount;
-
-
- /* free up temp storage*/
- icu_free(tempIndex);
- this_obj->fCompact = TRUE;
- } /* endif (!this_obj->fCompact)*/
- }
-
-