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