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FileIO.cpp
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FileIO.cpp
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#include "stdafx.h"
#include "FileIO.h"
namespace
{
char bomBytes[][4] = {
{ 0 }, // BOM_NONE
{ '\xEF', '\xBB', '\xBF', 0 }, // BOM_UTF8
{ '\xFF', '\xFE', 0 }, // BOM_UTF16LE
{ '\xFE', '\xFF', 0 }, // BOM_UTF16BE
};
bool isbom(std::vector<char>& data, const char* c)
{
size_t len = strlen(c);
if (data.size() >= len)
{
bool is = memcmp(data.data(), c, len) == 0;
if (is)
data.erase(data.begin(), data.begin() + len);
return is;
}
else
return false;
}
void byteswap16(unsigned short* data, size_t count)
{
for (size_t i = 0; i < count; ++i)
data[i] = _byteswap_ushort(data[i]);
}
void byteswap(std::vector<wchar_t>& chars)
{
#if 0
for (wchar_t& c : chars)
c = _byteswap_ushort(c);
#else
byteswap16(reinterpret_cast<unsigned short*>(chars.data()), chars.size() - 1);
#endif
}
void byteswap(std::vector<char>& data)
{
byteswap16(reinterpret_cast<unsigned short*>(data.data()), (data.size() - 1) * (sizeof(wchar_t) / sizeof(char)));
}
std::vector<char> loadfile(const wchar_t* filename, BOM& bom)
{
std::vector<char> data;
FILE* f = nullptr;
errno_t e = _wfopen_s(&f, filename, L"rb");
if (e != 0)
throw std::exception("Error opening file");
_fseeki64(f, 0, SEEK_END);
__int64 size = _ftelli64(f);
_fseeki64(f, 0, SEEK_SET);
data.resize(size);
if (!data.empty())
fread(data.data(), 1, size, f);
fclose(f);
bom = BOM_NONE;
if (isbom(data, bomBytes[BOM_UTF8]))
bom = BOM_UTF8;
else if (isbom(data, bomBytes[BOM_UTF16LE]))
bom = BOM_UTF16LE;
else if (isbom(data, bomBytes[BOM_UTF16BE]))
bom = BOM_UTF16BE;
return data;
}
void savefile(const wchar_t* filename, BOM bom, const std::vector<char>& data)
{
FILE* f = nullptr;
errno_t e = _wfopen_s(&f, filename, L"wb");
if (e != 0)
throw std::exception("Error saving file");
if (bom != BOM_NONE)
{
const char* c = bomBytes[bom];
size_t len = strlen(c);
fwrite(c, 1, len, f);
}
if (!data.empty())
fwrite(data.data(), 1, data.size(), f);
fclose(f);
}
std::vector<wchar_t> convert(const std::vector<char>& data, BOM bom)
{
std::vector<wchar_t> chars;
switch (bom)
{
case BOM_UTF16BE:
case BOM_UTF16LE:
chars.resize((data.size() - 1) / (sizeof(wchar_t) / sizeof(char)) + 1);
memcpy(chars.data(), data.data(), data.size() - 1);
chars.back() = data.back();
if (bom == BOM_UTF16BE)
byteswap(chars);
break;
default:
int s = MultiByteToWideChar(CP_UTF8, 0, data.data(), (int) data.size(), nullptr, 0);
if (s == 0)
throw std::exception("Error converting to wcs");
chars.resize(s);
MultiByteToWideChar(CP_UTF8, 0, data.data(), (int) data.size(), chars.data(), s);
break;
}
return chars;
}
std::vector<char> convert(const std::vector<wchar_t>& chars, BOM bom)
{
std::vector<char> data;
switch (bom)
{
case BOM_UTF16BE:
case BOM_UTF16LE:
data.resize((chars.size() - 1) * (sizeof(wchar_t) / sizeof(char)) + 1);
memcpy(data.data(), chars.data(), data.size() - 1);
data.back() = static_cast<char>(chars.back());
if (bom == BOM_UTF16BE)
byteswap(data);
break;
default:
int s = WideCharToMultiByte(CP_UTF8, 0, chars.data(), (int) chars.size(), nullptr, 0, nullptr, nullptr);
if (s == 0)
throw std::exception("Error converting to wcs");
data.resize(s);
WideCharToMultiByte(CP_UTF8, 0, chars.data(), (int) chars.size(), data.data(), s, nullptr, nullptr);
}
return data;
}
}
std::vector<wchar_t> loadtextfile(const wchar_t* filename, BOM& bom)
{
std::vector<char> data = loadfile(filename, bom);
data.push_back('\0');
std::vector<wchar_t> chars = convert(data, bom);
#if 1
std::vector<char> cmp = convert(chars, bom);
if (data != cmp)
throw std::exception("Unicode convert check failed");
#endif
return chars;
}
void savetextfile(const wchar_t* filename, BOM bom, const std::vector<wchar_t>& chars)
{
std::vector<char> data = convert(chars, bom);
data.pop_back();
savefile(filename, bom, data);
}