| /* |
| ******************************************************************************* |
| * |
| * Copyright (C) 2005, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ******************************************************************************* |
| * file name: ucasemap.c |
| * encoding: US-ASCII |
| * tab size: 8 (not used) |
| * indentation:4 |
| * |
| * created on: 2005may06 |
| * created by: Markus W. Scherer |
| * |
| * Case mapping service object and functions using it. |
| */ |
| |
| #include "unicode/utypes.h" |
| #include "unicode/uloc.h" |
| #include "unicode/ustring.h" |
| #include "unicode/ucasemap.h" |
| #include "cmemory.h" |
| #include "cstring.h" |
| #include "ucase.h" |
| #include "ustr_imp.h" |
| |
| /* UCaseMap service object -------------------------------------------------- */ |
| |
| struct UCaseMap { |
| const UCaseProps *csp; |
| char locale[32]; |
| int32_t locCache; |
| uint32_t options; |
| }; |
| |
| U_DRAFT UCaseMap * U_EXPORT2 |
| ucasemap_open(const char *locale, uint32_t options, UErrorCode *pErrorCode) { |
| UCaseMap *csm; |
| |
| if(U_FAILURE(*pErrorCode)) { |
| return NULL; |
| } |
| |
| csm=(UCaseMap *)uprv_malloc(sizeof(UCaseMap)); |
| if(csm==NULL) { |
| return NULL; |
| } |
| uprv_memset(csm, 0, sizeof(UCaseMap)); |
| |
| csm->csp=ucase_getSingleton(pErrorCode); |
| ucasemap_setLocale(csm, locale, pErrorCode); |
| if(U_FAILURE(*pErrorCode)) { |
| uprv_free(csm); |
| return NULL; |
| } |
| |
| csm->options=options; |
| return csm; |
| } |
| |
| U_DRAFT void U_EXPORT2 |
| ucasemap_close(UCaseMap *csm) { |
| if(csm!=NULL) { |
| uprv_free(csm); |
| } |
| } |
| |
| U_DRAFT const char * U_EXPORT2 |
| ucasemap_getLocale(const UCaseMap *csm) { |
| return csm->locale; |
| } |
| |
| U_DRAFT uint32_t U_EXPORT2 |
| ucasemap_getOptions(const UCaseMap *csm) { |
| return csm->options; |
| } |
| |
| U_DRAFT void U_EXPORT2 |
| ucasemap_setLocale(UCaseMap *csm, const char *locale, UErrorCode *pErrorCode) { |
| int32_t length; |
| |
| if(U_FAILURE(*pErrorCode)) { |
| return; |
| } |
| |
| length=uloc_getName(locale, csm->locale, (int32_t)sizeof(csm->locale), pErrorCode); |
| if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR || length==sizeof(csm->locale)) { |
| *pErrorCode=U_ZERO_ERROR; |
| /* we only really need the language code for case mappings */ |
| length=uloc_getLanguage(locale, csm->locale, (int32_t)sizeof(csm->locale), pErrorCode); |
| } |
| if(length==sizeof(csm->locale)) { |
| *pErrorCode=U_BUFFER_OVERFLOW_ERROR; |
| } |
| csm->locCache=0; |
| if(U_SUCCESS(*pErrorCode)) { |
| ucase_getCaseLocale(csm->locale, &csm->locCache); |
| } else { |
| csm->locale[0]=0; |
| } |
| } |
| |
| U_DRAFT void U_EXPORT2 |
| ucasemap_setOptions(UCaseMap *csm, uint32_t options, UErrorCode *pErrorCode) { |
| csm->options=options; |
| } |
| |
| /* UTF-8 string case mappings ----------------------------------------------- */ |
| |
| /* append a full case mapping result, see UCASE_MAX_STRING_LENGTH */ |
| static U_INLINE int32_t |
| appendResult(uint8_t *dest, int32_t destIndex, int32_t destCapacity, |
| int32_t result, const UChar *s) { |
| UChar32 c; |
| int32_t length, destLength; |
| UErrorCode errorCode; |
| |
| /* decode the result */ |
| if(result<0) { |
| /* (not) original code point */ |
| c=~result; |
| length=-1; |
| } else if(result<=UCASE_MAX_STRING_LENGTH) { |
| c=U_SENTINEL; |
| length=result; |
| } else { |
| c=result; |
| length=-1; |
| } |
| |
| if(destIndex<destCapacity) { |
| /* append the result */ |
| if(length<0) { |
| /* code point */ |
| UBool isError=FALSE; |
| U8_APPEND(dest, destIndex, destCapacity, c, isError); |
| if(isError) { |
| /* overflow, nothing written */ |
| destIndex+=U8_LENGTH(c); |
| } |
| } else { |
| /* string */ |
| errorCode=U_ZERO_ERROR; |
| u_strToUTF8( |
| (char *)(dest+destIndex), destCapacity-destIndex, &destLength, |
| s, length, |
| &errorCode); |
| destIndex+=length; |
| /* we might have an overflow, but we know the actual length */ |
| } |
| } else { |
| /* preflight */ |
| if(length<0) { |
| destIndex+=U8_LENGTH(c); |
| } else { |
| errorCode=U_ZERO_ERROR; |
| u_strToUTF8( |
| NULL, 0, &destLength, |
| s, length, |
| &errorCode); |
| destIndex+=length; |
| } |
| } |
| return destIndex; |
| } |
| |
| static UChar32 U_CALLCONV |
| utf8_caseContextIterator(void *context, int8_t dir) { |
| UCaseContext *csc=(UCaseContext *)context; |
| UChar32 c; |
| |
| if(dir<0) { |
| /* reset for backward iteration */ |
| csc->index=csc->cpStart; |
| csc->dir=dir; |
| } else if(dir>0) { |
| /* reset for forward iteration */ |
| csc->index=csc->cpLimit; |
| csc->dir=dir; |
| } else { |
| /* continue current iteration direction */ |
| dir=csc->dir; |
| } |
| |
| if(dir<0) { |
| if(csc->start<csc->index) { |
| U8_PREV((const uint8_t *)csc->p, csc->start, csc->index, c); |
| return c; |
| } |
| } else { |
| if(csc->index<csc->limit) { |
| U8_NEXT((const uint8_t *)csc->p, csc->index, csc->limit, c); |
| return c; |
| } |
| } |
| return U_SENTINEL; |
| } |
| |
| typedef int32_t U_CALLCONV |
| UCaseMapFull(const UCaseProps *csp, UChar32 c, |
| UCaseContextIterator *iter, void *context, |
| const UChar **pString, |
| const char *locale, int32_t *locCache); |
| |
| /* |
| * Case-maps [srcStart..srcLimit[ but takes |
| * context [0..srcLength[ into account. |
| */ |
| static int32_t |
| _caseMap(const UCaseMap *csm, UCaseMapFull *map, |
| uint8_t *dest, int32_t destCapacity, |
| const uint8_t *src, UCaseContext *csc, |
| int32_t srcStart, int32_t srcLimit, |
| UErrorCode *pErrorCode) { |
| const UChar *s; |
| UChar32 c; |
| int32_t srcIndex, destIndex; |
| int32_t locCache; |
| |
| locCache=csm->locCache; |
| |
| /* case mapping loop */ |
| srcIndex=srcStart; |
| destIndex=0; |
| while(srcIndex<srcLimit) { |
| csc->cpStart=srcIndex; |
| U8_NEXT(src, srcIndex, srcLimit, c); |
| csc->cpLimit=srcIndex; |
| c=map(csm->csp, c, utf8_caseContextIterator, csc, &s, csm->locale, &locCache); |
| destIndex=appendResult(dest, destIndex, destCapacity, c, s); |
| } |
| |
| if(destIndex>destCapacity) { |
| *pErrorCode=U_BUFFER_OVERFLOW_ERROR; |
| } |
| return destIndex; |
| } |
| |
| /* |
| * Implement argument checking and buffer handling |
| * for string case mapping as a common function. |
| */ |
| enum { |
| TO_LOWER, |
| TO_UPPER, |
| TO_TITLE, |
| FOLD_CASE |
| }; |
| |
| /* common internal function for public API functions */ |
| |
| static int32_t |
| caseMap(const UCaseMap *csm, |
| uint8_t *dest, int32_t destCapacity, |
| const uint8_t *src, int32_t srcLength, |
| int32_t toWhichCase, |
| UErrorCode *pErrorCode) { |
| UCaseContext csc={ NULL }; |
| int32_t destLength; |
| |
| /* check argument values */ |
| if(U_FAILURE(*pErrorCode)) { |
| return 0; |
| } |
| if( destCapacity<0 || |
| (dest==NULL && destCapacity>0) || |
| src==NULL || |
| srcLength<-1 |
| ) { |
| *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| /* get the string length */ |
| if(srcLength==-1) { |
| srcLength=uprv_strlen((const char *)src); |
| } |
| |
| /* check for overlapping source and destination */ |
| if( dest!=NULL && |
| ((src>=dest && src<(dest+destCapacity)) || |
| (dest>=src && dest<(src+srcLength))) |
| ) { |
| *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| destLength=0; |
| |
| csc.p=(void *)src; |
| csc.limit=srcLength; |
| |
| if(toWhichCase==TO_LOWER) { |
| destLength=_caseMap(csm, ucase_toFullLower, |
| dest, destCapacity, |
| src, &csc, |
| 0, srcLength, |
| pErrorCode); |
| } else /* if(toWhichCase==TO_UPPER) */ { |
| destLength=_caseMap(csm, ucase_toFullUpper, |
| dest, destCapacity, |
| src, &csc, |
| 0, srcLength, |
| pErrorCode); |
| } |
| |
| return u_terminateChars((char *)dest, destCapacity, destLength, pErrorCode); |
| } |
| |
| /* public API functions */ |
| |
| U_DRAFT int32_t U_EXPORT2 |
| ucasemap_utf8ToLower(const UCaseMap *csm, |
| char *dest, int32_t destCapacity, |
| const char *src, int32_t srcLength, |
| UErrorCode *pErrorCode) { |
| return caseMap(csm, |
| (uint8_t *)dest, destCapacity, |
| (const uint8_t *)src, srcLength, |
| TO_LOWER, pErrorCode); |
| } |
| |
| U_DRAFT int32_t U_EXPORT2 |
| ucasemap_utf8ToUpper(const UCaseMap *csm, |
| char *dest, int32_t destCapacity, |
| const char *src, int32_t srcLength, |
| UErrorCode *pErrorCode) { |
| return caseMap(csm, |
| (uint8_t *)dest, destCapacity, |
| (const uint8_t *)src, srcLength, |
| TO_UPPER, pErrorCode); |
| } |