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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2022-2023 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include "iconv_codecvt.hpp"
#include <boost/assert.hpp>
#include <array>
#include <cerrno>
#include <limits>
#include <vector>
#ifdef BOOST_LOCALE_WITH_ICONV
# include "../util/encoding.hpp"
# include "../util/iconv.hpp"
# include "../util/make_std_unique.hpp"
#endif
namespace boost { namespace locale {
#ifdef BOOST_LOCALE_WITH_ICONV
class mb2_iconv_converter : public util::base_converter {
public:
mb2_iconv_converter(const std::string& encoding) : encoding_(encoding)
{
iconv_handle d(iconv_open(util::utf_name<uint32_t>(), encoding.c_str()));
if(!d)
throw std::runtime_error("Unsupported encoding" + encoding);
for(unsigned c = 0; c < first_byte_table_.size(); c++) {
const char ibuf[2] = {char(c), 0};
size_t insize = sizeof(ibuf);
uint32_t obuf[2] = {illegal, illegal};
size_t outsize = sizeof(obuf);
// Basic single codepoint conversion
call_iconv(d, ibuf, &insize, reinterpret_cast<char*>(obuf), &outsize);
if(insize == 0 && outsize == 0 && obuf[1] == 0)
first_byte_table_[c] = obuf[0];
else {
// Test if this is illegal first byte or incomplete
insize = 1;
outsize = sizeof(obuf);
call_iconv(d, nullptr, nullptr, nullptr, nullptr);
const size_t res = call_iconv(d, ibuf, &insize, reinterpret_cast<char*>(obuf), &outsize);
// Now if this single byte starts a sequence we add incomplete
// to know to ask that we need two bytes, otherwise it may only be illegal
first_byte_table_[c] = (res == size_t(-1) && errno == EINVAL) ? incomplete : illegal;
}
}
}
mb2_iconv_converter(const mb2_iconv_converter& other) :
first_byte_table_(other.first_byte_table_), encoding_(other.encoding_)
{}
bool is_thread_safe() const override { return false; }
mb2_iconv_converter* clone() const override { return new mb2_iconv_converter(*this); }
utf::code_point to_unicode(const char*& begin, const char* end) override
{
if(begin == end)
return incomplete;
const unsigned char seq0 = *begin;
# if defined(BOOST_GCC_VERSION) && BOOST_GCC_VERSION >= 40600
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wtype-limits"
# endif
static_assert(std::numeric_limits<unsigned char>::max()
< std::tuple_size<decltype(first_byte_table_)>::value,
"Wrong table size");
# if defined(BOOST_GCC_VERSION) && BOOST_GCC_VERSION >= 40600
# pragma GCC diagnostic pop
# endif
const uint32_t index = first_byte_table_[seq0];
if(index == illegal)
return illegal;
if(index != incomplete) {
begin++;
return index;
} else if(begin + 1 == end)
return incomplete;
open(to_utf_, util::utf_name<uint32_t>(), encoding_.c_str());
// maybe illegal or may be double byte
const char inseq[3] = {static_cast<char>(seq0), begin[1], 0};
size_t insize = sizeof(inseq);
uint32_t result[2] = {illegal, illegal};
size_t outsize = sizeof(result);
call_iconv(to_utf_, inseq, &insize, reinterpret_cast<char*>(result), &outsize);
if(outsize == 0 && insize == 0 && result[1] == 0) {
begin += 2;
return result[0];
}
return illegal;
}
utf::len_or_error from_unicode(utf::code_point cp, char* begin, const char* end) override
{
if(cp == 0) {
if(begin != end) {
*begin = 0;
return 1;
} else
return incomplete;
}
open(from_utf_, encoding_.c_str(), util::utf_name<utf::code_point>());
const utf::code_point inbuf[2] = {cp, 0};
size_t insize = sizeof(inbuf);
char outseq[3] = {0};
size_t outsize = sizeof(outseq);
call_iconv(from_utf_, reinterpret_cast<const char*>(inbuf), &insize, outseq, &outsize);
if(insize != 0 || outsize == sizeof(outseq))
return illegal;
const size_t len = sizeof(outseq) - outsize - 1; // Skip trailing NULL
if(static_cast<std::ptrdiff_t>(len) > end - begin)
return incomplete;
for(unsigned i = 0; i < len; i++)
*begin++ = outseq[i];
return static_cast<utf::code_point>(len);
}
int max_len() const override
{
return 2;
}
private:
std::array<uint32_t, 256> first_byte_table_;
std::string encoding_;
iconv_handle to_utf_, from_utf_;
static void open(iconv_handle& d, const char* to, const char* from)
{
if(!d)
d = iconv_open(to, from);
BOOST_ASSERT(d);
}
};
std::unique_ptr<util::base_converter> create_iconv_converter(const std::string& encoding)
{
try {
return make_std_unique<mb2_iconv_converter>(encoding);
} catch(const std::exception&) {
return nullptr;
}
}
#else // no iconv
std::unique_ptr<util::base_converter> create_iconv_converter(const std::string& /*encoding*/)
{
return nullptr;
}
#endif
}} // namespace boost::locale
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