diff options
Diffstat (limited to 'intl/icu/source/common/unistr_cnv.cpp')
| -rw-r--r-- | intl/icu/source/common/unistr_cnv.cpp | 417 |
1 files changed, 417 insertions, 0 deletions
diff --git a/intl/icu/source/common/unistr_cnv.cpp b/intl/icu/source/common/unistr_cnv.cpp new file mode 100644 index 000000000..a9b44ee42 --- /dev/null +++ b/intl/icu/source/common/unistr_cnv.cpp @@ -0,0 +1,417 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************* +* +* Copyright (C) 1999-2014, International Business Machines +* Corporation and others. All Rights Reserved. +* +******************************************************************************* +* file name: unistr_cnv.cpp +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:2 +* +* created on: 2004aug19 +* created by: Markus W. Scherer +* +* Character conversion functions moved here from unistr.cpp +*/ + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_CONVERSION + +#include "unicode/putil.h" +#include "cstring.h" +#include "cmemory.h" +#include "unicode/ustring.h" +#include "unicode/unistr.h" +#include "unicode/ucnv.h" +#include "ucnv_imp.h" +#include "putilimp.h" +#include "ustr_cnv.h" +#include "ustr_imp.h" + +U_NAMESPACE_BEGIN + +//======================================== +// Constructors +//======================================== + +#if !U_CHARSET_IS_UTF8 + +UnicodeString::UnicodeString(const char *codepageData) { + fUnion.fFields.fLengthAndFlags = kShortString; + if(codepageData != 0) { + doCodepageCreate(codepageData, (int32_t)uprv_strlen(codepageData), 0); + } +} + +UnicodeString::UnicodeString(const char *codepageData, + int32_t dataLength) { + fUnion.fFields.fLengthAndFlags = kShortString; + if(codepageData != 0) { + doCodepageCreate(codepageData, dataLength, 0); + } +} + +// else see unistr.cpp +#endif + +UnicodeString::UnicodeString(const char *codepageData, + const char *codepage) { + fUnion.fFields.fLengthAndFlags = kShortString; + if(codepageData != 0) { + doCodepageCreate(codepageData, (int32_t)uprv_strlen(codepageData), codepage); + } +} + +UnicodeString::UnicodeString(const char *codepageData, + int32_t dataLength, + const char *codepage) { + fUnion.fFields.fLengthAndFlags = kShortString; + if(codepageData != 0) { + doCodepageCreate(codepageData, dataLength, codepage); + } +} + +UnicodeString::UnicodeString(const char *src, int32_t srcLength, + UConverter *cnv, + UErrorCode &errorCode) { + fUnion.fFields.fLengthAndFlags = kShortString; + if(U_SUCCESS(errorCode)) { + // check arguments + if(src==NULL) { + // treat as an empty string, do nothing more + } else if(srcLength<-1) { + errorCode=U_ILLEGAL_ARGUMENT_ERROR; + } else { + // get input length + if(srcLength==-1) { + srcLength=(int32_t)uprv_strlen(src); + } + if(srcLength>0) { + if(cnv!=0) { + // use the provided converter + ucnv_resetToUnicode(cnv); + doCodepageCreate(src, srcLength, cnv, errorCode); + } else { + // use the default converter + cnv=u_getDefaultConverter(&errorCode); + doCodepageCreate(src, srcLength, cnv, errorCode); + u_releaseDefaultConverter(cnv); + } + } + } + + if(U_FAILURE(errorCode)) { + setToBogus(); + } + } +} + +//======================================== +// Codeset conversion +//======================================== + +#if !U_CHARSET_IS_UTF8 + +int32_t +UnicodeString::extract(int32_t start, + int32_t length, + char *target, + uint32_t dstSize) const { + return extract(start, length, target, dstSize, 0); +} + +// else see unistr.cpp +#endif + +int32_t +UnicodeString::extract(int32_t start, + int32_t length, + char *target, + uint32_t dstSize, + const char *codepage) const +{ + // if the arguments are illegal, then do nothing + if(/*dstSize < 0 || */(dstSize > 0 && target == 0)) { + return 0; + } + + // pin the indices to legal values + pinIndices(start, length); + + // We need to cast dstSize to int32_t for all subsequent code. + // I don't know why the API was defined with uint32_t but we are stuck with it. + // Also, dstSize==0xffffffff means "unlimited" but if we use target+dstSize + // as a limit in some functions, it may wrap around and yield a pointer + // that compares less-than target. + int32_t capacity; + if(dstSize < 0x7fffffff) { + // Assume that the capacity is real and a limit pointer won't wrap around. + capacity = (int32_t)dstSize; + } else { + // Pin the capacity so that a limit pointer does not wrap around. + char *targetLimit = (char *)U_MAX_PTR(target); + // U_MAX_PTR(target) returns a targetLimit that is at most 0x7fffffff + // greater than target and does not wrap around the top of the address space. + capacity = (int32_t)(targetLimit - target); + } + + // create the converter + UConverter *converter; + UErrorCode status = U_ZERO_ERROR; + + // just write the NUL if the string length is 0 + if(length == 0) { + return u_terminateChars(target, capacity, 0, &status); + } + + // if the codepage is the default, use our cache + // if it is an empty string, then use the "invariant character" conversion + if (codepage == 0) { + const char *defaultName = ucnv_getDefaultName(); + if(UCNV_FAST_IS_UTF8(defaultName)) { + return toUTF8(start, length, target, capacity); + } + converter = u_getDefaultConverter(&status); + } else if (*codepage == 0) { + // use the "invariant characters" conversion + int32_t destLength; + if(length <= capacity) { + destLength = length; + } else { + destLength = capacity; + } + u_UCharsToChars(getArrayStart() + start, target, destLength); + return u_terminateChars(target, capacity, length, &status); + } else { + converter = ucnv_open(codepage, &status); + } + + length = doExtract(start, length, target, capacity, converter, status); + + // close the converter + if (codepage == 0) { + u_releaseDefaultConverter(converter); + } else { + ucnv_close(converter); + } + + return length; +} + +int32_t +UnicodeString::extract(char *dest, int32_t destCapacity, + UConverter *cnv, + UErrorCode &errorCode) const +{ + if(U_FAILURE(errorCode)) { + return 0; + } + + if(isBogus() || destCapacity<0 || (destCapacity>0 && dest==0)) { + errorCode=U_ILLEGAL_ARGUMENT_ERROR; + return 0; + } + + // nothing to do? + if(isEmpty()) { + return u_terminateChars(dest, destCapacity, 0, &errorCode); + } + + // get the converter + UBool isDefaultConverter; + if(cnv==0) { + isDefaultConverter=TRUE; + cnv=u_getDefaultConverter(&errorCode); + if(U_FAILURE(errorCode)) { + return 0; + } + } else { + isDefaultConverter=FALSE; + ucnv_resetFromUnicode(cnv); + } + + // convert + int32_t len=doExtract(0, length(), dest, destCapacity, cnv, errorCode); + + // release the converter + if(isDefaultConverter) { + u_releaseDefaultConverter(cnv); + } + + return len; +} + +int32_t +UnicodeString::doExtract(int32_t start, int32_t length, + char *dest, int32_t destCapacity, + UConverter *cnv, + UErrorCode &errorCode) const +{ + if(U_FAILURE(errorCode)) { + if(destCapacity!=0) { + *dest=0; + } + return 0; + } + + const UChar *src=getArrayStart()+start, *srcLimit=src+length; + char *originalDest=dest; + const char *destLimit; + + if(destCapacity==0) { + destLimit=dest=0; + } else if(destCapacity==-1) { + // Pin the limit to U_MAX_PTR if the "magic" destCapacity is used. + destLimit=(char*)U_MAX_PTR(dest); + // for NUL-termination, translate into highest int32_t + destCapacity=0x7fffffff; + } else { + destLimit=dest+destCapacity; + } + + // perform the conversion + ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, TRUE, &errorCode); + length=(int32_t)(dest-originalDest); + + // if an overflow occurs, then get the preflighting length + if(errorCode==U_BUFFER_OVERFLOW_ERROR) { + char buffer[1024]; + + destLimit=buffer+sizeof(buffer); + do { + dest=buffer; + errorCode=U_ZERO_ERROR; + ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, TRUE, &errorCode); + length+=(int32_t)(dest-buffer); + } while(errorCode==U_BUFFER_OVERFLOW_ERROR); + } + + return u_terminateChars(originalDest, destCapacity, length, &errorCode); +} + +void +UnicodeString::doCodepageCreate(const char *codepageData, + int32_t dataLength, + const char *codepage) +{ + // if there's nothing to convert, do nothing + if(codepageData == 0 || dataLength == 0 || dataLength < -1) { + return; + } + if(dataLength == -1) { + dataLength = (int32_t)uprv_strlen(codepageData); + } + + UErrorCode status = U_ZERO_ERROR; + + // create the converter + // if the codepage is the default, use our cache + // if it is an empty string, then use the "invariant character" conversion + UConverter *converter; + if (codepage == 0) { + const char *defaultName = ucnv_getDefaultName(); + if(UCNV_FAST_IS_UTF8(defaultName)) { + setToUTF8(StringPiece(codepageData, dataLength)); + return; + } + converter = u_getDefaultConverter(&status); + } else if(*codepage == 0) { + // use the "invariant characters" conversion + if(cloneArrayIfNeeded(dataLength, dataLength, FALSE)) { + u_charsToUChars(codepageData, getArrayStart(), dataLength); + setLength(dataLength); + } else { + setToBogus(); + } + return; + } else { + converter = ucnv_open(codepage, &status); + } + + // if we failed, set the appropriate flags and return + if(U_FAILURE(status)) { + setToBogus(); + return; + } + + // perform the conversion + doCodepageCreate(codepageData, dataLength, converter, status); + if(U_FAILURE(status)) { + setToBogus(); + } + + // close the converter + if(codepage == 0) { + u_releaseDefaultConverter(converter); + } else { + ucnv_close(converter); + } +} + +void +UnicodeString::doCodepageCreate(const char *codepageData, + int32_t dataLength, + UConverter *converter, + UErrorCode &status) +{ + if(U_FAILURE(status)) { + return; + } + + // set up the conversion parameters + const char *mySource = codepageData; + const char *mySourceEnd = mySource + dataLength; + UChar *array, *myTarget; + + // estimate the size needed: + int32_t arraySize; + if(dataLength <= US_STACKBUF_SIZE) { + // try to use the stack buffer + arraySize = US_STACKBUF_SIZE; + } else { + // 1.25 UChar's per source byte should cover most cases + arraySize = dataLength + (dataLength >> 2); + } + + // we do not care about the current contents + UBool doCopyArray = FALSE; + for(;;) { + if(!cloneArrayIfNeeded(arraySize, arraySize, doCopyArray)) { + setToBogus(); + break; + } + + // perform the conversion + array = getArrayStart(); + myTarget = array + length(); + ucnv_toUnicode(converter, &myTarget, array + getCapacity(), + &mySource, mySourceEnd, 0, TRUE, &status); + + // update the conversion parameters + setLength((int32_t)(myTarget - array)); + + // allocate more space and copy data, if needed + if(status == U_BUFFER_OVERFLOW_ERROR) { + // reset the error code + status = U_ZERO_ERROR; + + // keep the previous conversion results + doCopyArray = TRUE; + + // estimate the new size needed, larger than before + // try 2 UChar's per remaining source byte + arraySize = (int32_t)(length() + 2 * (mySourceEnd - mySource)); + } else { + break; + } + } +} + +U_NAMESPACE_END + +#endif |