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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_SRC_LOCALE_ICU_UCONV_HPP
#define BOOST_SRC_LOCALE_ICU_UCONV_HPP
#include <unicode/unistr.h>
#include <unicode/ucnv.h>
#include <unicode/ustring.h>
#include <unicode/utf.h>
#include <unicode/utf16.h>
#include <boost/locale/encoding.hpp>
#include <string>
#include <memory>
#include "icu_util.hpp"
namespace boost {
namespace locale {
namespace impl_icu {
typedef enum {
cvt_skip,
cvt_stop
} cpcvt_type;
template<typename CharType,int char_size = sizeof(CharType) >
class icu_std_converter {
public:
typedef CharType char_type;
typedef std::basic_string<char_type> string_type;
icu_std_converter(std::string charset,cpcvt_type cv=cvt_skip);
icu::UnicodeString icu(char_type const *begin,char_type const *end) const;
string_type std(icu::UnicodeString const &str) const;
size_t cut(icu::UnicodeString const &str,char_type const *begin,char_type const *end,size_t n,size_t from_u=0,size_t from_c=0) const;
};
template<typename CharType>
class icu_std_converter<CharType,1> {
public:
typedef CharType char_type;
typedef std::basic_string<char_type> string_type;
icu::UnicodeString icu_checked(char_type const *vb,char_type const *ve) const
{
return icu(vb,ve); // Already done
}
icu::UnicodeString icu(char_type const *vb,char_type const *ve) const
{
char const *begin=reinterpret_cast<char const *>(vb);
char const *end=reinterpret_cast<char const *>(ve);
uconv cvt(charset_,cvt_type_);
UErrorCode err=U_ZERO_ERROR;
icu::UnicodeString tmp(begin,end-begin,cvt.cvt(),err);
check_and_throw_icu_error(err);
return tmp;
}
string_type std(icu::UnicodeString const &str) const
{
uconv cvt(charset_,cvt_type_);
return cvt.go(str.getBuffer(),str.length(),max_len_);
}
icu_std_converter(std::string charset,cpcvt_type cvt_type = cvt_skip) :
charset_(charset),
cvt_type_(cvt_type)
{
uconv cvt(charset_,cvt_type);
max_len_=cvt.max_char_size();
}
size_t cut(icu::UnicodeString const &str,char_type const *begin,char_type const *end,
size_t n,size_t from_u=0,size_t from_char=0) const
{
size_t code_points = str.countChar32(from_u,n);
uconv cvt(charset_,cvt_type_);
return cvt.cut(code_points,begin+from_char,end);
}
struct uconv {
uconv(uconv const &other);
void operator=(uconv const &other);
public:
uconv(std::string const &charset,cpcvt_type cvt_type=cvt_skip)
{
UErrorCode err=U_ZERO_ERROR;
cvt_ = ucnv_open(charset.c_str(),&err);
if(!cvt_ || U_FAILURE(err)) {
if(cvt_)
ucnv_close(cvt_);
throw conv::invalid_charset_error(charset);
}
try {
if(cvt_type==cvt_skip) {
ucnv_setFromUCallBack(cvt_,UCNV_FROM_U_CALLBACK_SKIP,0,0,0,&err);
check_and_throw_icu_error(err);
err=U_ZERO_ERROR;
ucnv_setToUCallBack(cvt_,UCNV_TO_U_CALLBACK_SKIP,0,0,0,&err);
check_and_throw_icu_error(err);
}
else {
ucnv_setFromUCallBack(cvt_,UCNV_FROM_U_CALLBACK_STOP,0,0,0,&err);
check_and_throw_icu_error(err);
err=U_ZERO_ERROR;
ucnv_setToUCallBack(cvt_,UCNV_TO_U_CALLBACK_STOP,0,0,0,&err);
check_and_throw_icu_error(err);
}
}
catch(...) { ucnv_close(cvt_) ; throw; }
}
int max_char_size()
{
return ucnv_getMaxCharSize(cvt_);
}
string_type go(UChar const *buf,int length,int max_size)
{
string_type res;
res.resize(UCNV_GET_MAX_BYTES_FOR_STRING(length,max_size));
char *ptr=reinterpret_cast<char *>(&res[0]);
UErrorCode err=U_ZERO_ERROR;
int n = ucnv_fromUChars(cvt_,ptr,res.size(),buf,length,&err);
check_and_throw_icu_error(err);
res.resize(n);
return res;
}
size_t cut(size_t n,char_type const *begin,char_type const *end)
{
char_type const *saved = begin;
while(n > 0 && begin < end) {
UErrorCode err=U_ZERO_ERROR;
ucnv_getNextUChar(cvt_,&begin,end,&err);
if(U_FAILURE(err))
return 0;
n--;
}
return begin - saved;
}
UConverter *cvt() { return cvt_; }
~uconv()
{
ucnv_close(cvt_);
}
private:
UConverter *cvt_;
};
private:
int max_len_;
std::string charset_;
cpcvt_type cvt_type_;
};
template<typename CharType>
class icu_std_converter<CharType,2> {
public:
typedef CharType char_type;
typedef std::basic_string<char_type> string_type;
icu::UnicodeString icu_checked(char_type const *begin,char_type const *end) const
{
icu::UnicodeString tmp(end-begin,0,0); // make inital capacity
while(begin!=end) {
UChar cl = *begin++;
if(U16_IS_SINGLE(cl))
tmp.append(static_cast<UChar32>(cl));
else if(U16_IS_LEAD(cl)) {
if(begin==end) {
throw_if_needed();
}
else {
UChar ct=*begin++;
if(!U16_IS_TRAIL(ct))
throw_if_needed();
else {
UChar32 c=U16_GET_SUPPLEMENTARY(cl,ct);
tmp.append(c);
}
}
}
else
throw_if_needed();
}
return tmp;
}
void throw_if_needed() const
{
if(mode_ == cvt_stop)
throw conv::conversion_error();
}
icu::UnicodeString icu(char_type const *vb,char_type const *ve) const
{
UChar const *begin=reinterpret_cast<UChar const *>(vb);
UChar const *end=reinterpret_cast<UChar const *>(ve);
icu::UnicodeString tmp(begin,end-begin);
return tmp;
}
string_type std(icu::UnicodeString const &str) const
{
char_type const *ptr=reinterpret_cast<char_type const *>(str.getBuffer());
return string_type(ptr,str.length());
}
size_t cut(icu::UnicodeString const &/*str*/,char_type const * /*begin*/,char_type const * /*end*/,size_t n,
size_t /*from_u*/=0,size_t /*from_c*/=0) const
{
return n;
}
icu_std_converter(std::string /*charset*/,cpcvt_type mode=cvt_skip) :
mode_(mode)
{
}
private:
cpcvt_type mode_;
};
template<typename CharType>
class icu_std_converter<CharType,4> {
public:
typedef CharType char_type;
typedef std::basic_string<char_type> string_type;
icu::UnicodeString icu_checked(char_type const *begin,char_type const *end) const
{
icu::UnicodeString tmp(end-begin,0,0); // make inital capacity
while(begin!=end) {
UChar32 c = static_cast<UChar32>(*begin++);
if(U_IS_UNICODE_CHAR(c))
tmp.append(c);
else
throw_if_needed();
}
return tmp;
}
void throw_if_needed() const
{
if(mode_ == cvt_stop)
throw conv::conversion_error();
}
icu::UnicodeString icu(char_type const *begin,char_type const *end) const
{
icu::UnicodeString tmp(end-begin,0,0); // make inital capacity
while(begin!=end) {
UChar32 c=static_cast<UChar32>(*begin++);
tmp.append(c);
}
return tmp;
}
string_type std(icu::UnicodeString const &str) const
{
string_type tmp;
tmp.resize(str.length());
UChar32 *ptr=reinterpret_cast<UChar32 *>(&tmp[0]);
#ifdef __SUNPRO_CC
int len=0;
#else
::int32_t len=0;
#endif
UErrorCode code=U_ZERO_ERROR;
u_strToUTF32(ptr,tmp.size(),&len,str.getBuffer(),str.length(),&code);
check_and_throw_icu_error(code);
tmp.resize(len);
return tmp;
}
size_t cut(icu::UnicodeString const &str,char_type const * /*begin*/,char_type const * /*end*/,size_t n,
size_t from_u=0,size_t /*from_c*/=0) const
{
return str.countChar32(from_u,n);
}
icu_std_converter(std::string /*charset*/,cpcvt_type mode=cvt_skip) :
mode_(mode)
{
}
private:
cpcvt_type mode_;
};
} /// impl_icu
} // locale
} // boost
#endif
// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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