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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cm_codecvt.hxx"
#include <limits>
#if defined(_WIN32)
#include <windows.h>
#undef max
#include <cmsys/Encoding.hxx>
#endif
codecvt::codecvt(Encoding e)
: m_lastState(0)
#if defined(_WIN32)
, m_codepage(0)
#endif
{
switch (e) {
case codecvt::ANSI:
#if defined(_WIN32)
m_noconv = false;
m_codepage = CP_ACP;
break;
#endif
// We don't know which ANSI encoding to use for other platforms than
// Windows so we don't do any conversion there
case codecvt::UTF8:
// Assume internal encoding is UTF-8
case codecvt::None:
// No encoding
default:
m_noconv = true;
}
}
codecvt::~codecvt(){};
bool codecvt::do_always_noconv() const throw()
{
return m_noconv;
};
std::codecvt_base::result codecvt::do_out(mbstate_t& state, const char* from,
const char* from_end,
const char*& from_next, char* to,
char* to_end, char*& to_next) const
{
if (m_noconv) {
return noconv;
}
std::codecvt_base::result res = error;
#if defined(_WIN32)
from_next = from;
to_next = to;
bool convert = true;
size_t count = from_end - from;
const char* data = from;
unsigned int& stateId = reinterpret_cast<unsigned int&>(state);
if (count == 0) {
return codecvt::ok;
} else if (count == 1) {
if (stateId == 0) {
// decode first byte for UTF-8
if ((*from & 0xF8) == 0xF0 || // 1111 0xxx; 4 bytes for codepoint
(*from & 0xF0) == 0xE0 || // 1110 xxxx; 3 bytes for codepoint
(*from & 0xE0) == 0xC0) // 110x xxxx; 2 bytes for codepoint
{
stateId = findStateId();
codecvt::State& s = m_states.at(stateId - 1);
s.bytes[0] = *from;
convert = false;
if ((*from & 0xF8) == 0xF0) {
s.totalBytes = 4;
} else if ((*from & 0xF0) == 0xE0) {
s.totalBytes = 3;
} else if ((*from & 0xE0) == 0xC0) {
s.totalBytes = 2;
}
s.bytesLeft = s.totalBytes - 1;
};
// else 1 byte for codepoint
} else {
codecvt::State& s = m_states.at(stateId - 1);
s.bytes[s.totalBytes - s.bytesLeft] = *from;
s.bytesLeft--;
data = s.bytes;
count = s.totalBytes - s.bytesLeft;
if ((*from & 0xC0) == 0x80) { // 10xx xxxx
convert = s.bytesLeft == 0;
} else {
// invalid multi-byte
convert = true;
}
if (convert) {
s.used = false;
if (stateId == m_lastState) {
m_lastState--;
}
stateId = 0;
}
}
if (convert) {
std::wstring wide = cmsys::Encoding::ToWide(std::string(data, count));
int r = WideCharToMultiByte(m_codepage, 0, wide.c_str(),
static_cast<int>(wide.size()), to,
to_end - to, NULL, NULL);
if (r > 0) {
from_next = from_end;
to_next = to + r;
res = ok;
}
} else {
res = partial;
from_next = from_end;
to_next = to;
}
}
#else
static_cast<void>(state);
static_cast<void>(from);
static_cast<void>(from_end);
static_cast<void>(from_next);
static_cast<void>(to);
static_cast<void>(to_end);
static_cast<void>(to_next);
res = codecvt::noconv;
#endif
return res;
};
std::codecvt_base::result codecvt::do_unshift(mbstate_t& state, char* to,
char* to_end,
char*& to_next) const
{
std::codecvt_base::result res = error;
to_next = to;
#if defined(_WIN32)
unsigned int& stateId = reinterpret_cast<unsigned int&>(state);
if (stateId > 0) {
codecvt::State& s = m_states.at(stateId - 1);
s.used = false;
if (stateId == m_lastState) {
m_lastState--;
}
stateId = 0;
std::wstring wide = cmsys::Encoding::ToWide(
std::string(s.bytes, s.totalBytes - s.bytesLeft));
int r = WideCharToMultiByte(m_codepage, 0, wide.c_str(),
static_cast<int>(wide.size()), to, to_end - to,
NULL, NULL);
if (r > 0) {
to_next = to + r;
res = ok;
}
} else {
res = ok;
}
#else
static_cast<void>(state);
static_cast<void>(to_end);
res = ok;
#endif
return res;
};
int codecvt::do_max_length() const throw()
{
return 4;
};
int codecvt::do_encoding() const throw()
{
return 0;
};
unsigned int codecvt::findStateId() const
{
unsigned int stateId = 0;
bool add = false;
const unsigned int maxSize = std::numeric_limits<unsigned int>::max();
if (m_lastState >= maxSize) {
m_lastState = 0;
}
if (m_states.size() <= m_lastState) {
add = true;
} else {
unsigned int i = m_lastState;
while (i < maxSize) {
codecvt::State& s = m_states.at(i);
i++;
if (!s.used) {
m_lastState = i;
stateId = m_lastState;
s.used = true;
s.totalBytes = 0;
s.bytesLeft = 0;
break;
}
if (i >= m_states.size()) {
i = 0;
}
if (i == m_lastState) {
add = true;
break;
}
}
};
if (add) {
codecvt::State s = { true, 0, 0, { 0, 0, 0, 0 } };
m_states.push_back(s);
m_lastState = (unsigned int)m_states.size();
stateId = m_lastState;
}
return stateId;
};
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