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#ifndef AL_COMPAT_H
#define AL_COMPAT_H
#ifdef __cplusplus
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <array>
#include <string>
#include <fstream>
inline std::string wstr_to_utf8(const WCHAR *wstr)
{
std::string ret;
int len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, nullptr, 0, nullptr, nullptr);
if(len > 0)
{
ret.resize(len);
WideCharToMultiByte(CP_UTF8, 0, wstr, -1, &ret[0], len, nullptr, nullptr);
ret.pop_back();
}
return ret;
}
inline std::wstring utf8_to_wstr(const char *str)
{
std::wstring ret;
int len = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
if(len > 0)
{
ret.resize(len);
MultiByteToWideChar(CP_UTF8, 0, str, -1, &ret[0], len);
ret.pop_back();
}
return ret;
}
namespace al {
// Windows' std::ifstream fails with non-ANSI paths since the standard only
// specifies names using const char* (or std::string). MSVC has a non-standard
// extension using const wchar_t* (or std::wstring?) to handle Unicode paths,
// but not all Windows compilers support it. So we have to make our own istream
// that accepts UTF-8 paths and forwards to Unicode-aware I/O functions.
class filebuf final : public std::streambuf {
std::array<char_type,4096> mBuffer;
HANDLE mFile{INVALID_HANDLE_VALUE};
int_type underflow() override
{
if(mFile != INVALID_HANDLE_VALUE && gptr() == egptr())
{
// Read in the next chunk of data, and set the pointers on success
DWORD got = 0;
if(ReadFile(mFile, mBuffer.data(), (DWORD)mBuffer.size(), &got, nullptr))
setg(mBuffer.data(), mBuffer.data(), mBuffer.data()+got);
}
if(gptr() == egptr())
return traits_type::eof();
return traits_type::to_int_type(*gptr());
}
pos_type seekoff(off_type offset, std::ios_base::seekdir whence, std::ios_base::openmode mode) override
{
if(mFile == INVALID_HANDLE_VALUE || (mode&std::ios_base::out) || !(mode&std::ios_base::in))
return traits_type::eof();
LARGE_INTEGER fpos;
switch(whence)
{
case std::ios_base::beg:
fpos.QuadPart = offset;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_BEGIN))
return traits_type::eof();
break;
case std::ios_base::cur:
// If the offset remains in the current buffer range, just
// update the pointer.
if((offset >= 0 && offset < off_type(egptr()-gptr())) ||
(offset < 0 && -offset <= off_type(gptr()-eback())))
{
// Get the current file offset to report the correct read
// offset.
fpos.QuadPart = 0;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_CURRENT))
return traits_type::eof();
setg(eback(), gptr()+offset, egptr());
return fpos.QuadPart - off_type(egptr()-gptr());
}
// Need to offset for the file offset being at egptr() while
// the requested offset is relative to gptr().
offset -= off_type(egptr()-gptr());
fpos.QuadPart = offset;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_CURRENT))
return traits_type::eof();
break;
case std::ios_base::end:
fpos.QuadPart = offset;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_END))
return traits_type::eof();
break;
default:
return traits_type::eof();
}
setg(nullptr, nullptr, nullptr);
return fpos.QuadPart;
}
pos_type seekpos(pos_type pos, std::ios_base::openmode mode) override
{
// Simplified version of seekoff
if(mFile == INVALID_HANDLE_VALUE || (mode&std::ios_base::out) || !(mode&std::ios_base::in))
return traits_type::eof();
LARGE_INTEGER fpos;
fpos.QuadPart = pos;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_BEGIN))
return traits_type::eof();
setg(nullptr, nullptr, nullptr);
return fpos.QuadPart;
}
public:
bool open(const wchar_t *filename, std::ios_base::openmode mode)
{
if((mode&std::ios_base::out) || !(mode&std::ios_base::in))
return false;
HANDLE f{CreateFileW(filename, GENERIC_READ, FILE_SHARE_READ, nullptr,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr)};
if(f == INVALID_HANDLE_VALUE) return false;
if(mFile != INVALID_HANDLE_VALUE)
CloseHandle(mFile);
mFile = f;
setg(nullptr, nullptr, nullptr);
return true;
}
bool open(const char *filename, std::ios_base::openmode mode)
{
std::wstring wname{utf8_to_wstr(filename)};
return open(wname.c_str(), mode);
}
bool is_open() const noexcept { return mFile != INVALID_HANDLE_VALUE; }
filebuf() = default;
~filebuf() override
{
if(mFile != INVALID_HANDLE_VALUE)
CloseHandle(mFile);
mFile = INVALID_HANDLE_VALUE;
}
};
// Inherit from std::istream to use our custom streambuf
class ifstream final : public std::istream {
filebuf mStreamBuf;
public:
ifstream(const std::wstring &filename, std::ios_base::openmode mode = std::ios_base::in)
: ifstream(filename.c_str(), mode) { }
ifstream(const wchar_t *filename, std::ios_base::openmode mode = std::ios_base::in)
: std::istream{nullptr}
{
init(&mStreamBuf);
// Set the failbit if the file failed to open.
if((mode&std::ios_base::out) ||
!mStreamBuf.open(filename, mode|std::ios_base::in))
clear(failbit);
}
ifstream(const std::string &filename, std::ios_base::openmode mode = std::ios_base::in)
: ifstream(filename.c_str(), mode) { }
ifstream(const char *filename, std::ios_base::openmode mode = std::ios_base::in)
: std::istream{nullptr}
{
init(&mStreamBuf);
// Set the failbit if the file failed to open.
if((mode&std::ios_base::out) ||
!mStreamBuf.open(filename, mode|std::ios_base::in))
clear(failbit);
}
bool is_open() const noexcept { return mStreamBuf.is_open(); }
};
} // namespace al
#define HAVE_DYNLOAD 1
#else /* _WIN32 */
#include <fstream>
namespace al {
using filebuf = std::filebuf;
using ifstream = std::ifstream;
} // namespace al
#if defined(HAVE_DLFCN_H)
#define HAVE_DYNLOAD 1
#endif
#endif /* _WIN32 */
#include <string>
struct PathNamePair { std::string path, fname; };
PathNamePair GetProcBinary(void);
#ifdef HAVE_DYNLOAD
void *LoadLib(const char *name);
void CloseLib(void *handle);
void *GetSymbol(void *handle, const char *name);
#endif
#endif /* __cplusplus */
#endif /* AL_COMPAT_H */
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