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fixing win32 file operations for 64 bit integers

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This commit is contained in:
Noel Berry 2021-03-26 22:48:16 -07:00
parent 3b4f721b64
commit 1376ef874b
1 changed files with 57 additions and 14 deletions
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67
src/internal/platform_backend_win32.cpp
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@ -69,7 +69,7 @@ bool PlatformBackend::init(const Config* config)
wc.lpszClassName = "BLAH WINDOW";
wc.hInstance = hInstance;
wc.lpfnWndProc = blah_window_procedure;
wc.hCursor = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hIcon = NULL;
wc.lpszMenuName = NULL;
wc.hbrBackground = (HBRUSH)COLOR_WINDOW;
@ -523,31 +523,74 @@ i64 PlatformBackend::file_length(PlatformBackend::FileHandle handle)
i64 PlatformBackend::file_position(PlatformBackend::FileHandle handle)
{
// Todo: handle 64-bit values properly
// Todo: cache this value? not sure how performant it is
return SetFilePointer(handle, 0, NULL, FILE_CURRENT);
LARGE_INTEGER move;
LARGE_INTEGER result;
move.QuadPart = 0;
result.QuadPart = 0;
SetFilePointerEx(handle, move, &result, FILE_CURRENT);
return result.QuadPart;
}
i64 PlatformBackend::file_seek(PlatformBackend::FileHandle handle, i64 seek_to)
{
// Todo: handle 64-bit values properly
return SetFilePointer(handle, seek_to, NULL, FILE_BEGIN);
LARGE_INTEGER move;
LARGE_INTEGER result;
move.QuadPart = seek_to;
result.QuadPart = 0;
SetFilePointerEx(handle, move, &result, FILE_BEGIN);
return result.QuadPart;
}
i64 PlatformBackend::file_read(PlatformBackend::FileHandle handle, void* ptr, i64 length)
{
DWORD read = 0;
if (ReadFile(handle, ptr, length, &read, NULL))
static const DWORD read_step = 65536;
i64 read = 0;
while (read < length)
{
DWORD to_read = read_step;
if (to_read > length - read)
to_read = (DWORD)(length - read);
DWORD moved = 0;
if (ReadFile(handle, (unsigned char*)ptr + read, to_read, &moved, NULL))
read += moved;
if (moved < to_read)
break;
}
return read;
return 0;
}
i64 PlatformBackend::file_write(PlatformBackend::FileHandle handle, const void* ptr, i64 length)
{
DWORD written = 0;
if (WriteFile(handle, ptr, length, &written, NULL))
static const DWORD write_step = 65536;
i64 written = 0;
while (written < length)
{
DWORD to_write = write_step;
if (to_write > length - written)
to_write = (DWORD)(length - written);
DWORD moved = 0;
if (WriteFile(handle, (unsigned char*)ptr + written, to_write, &moved, NULL))
written += moved;
if (moved < to_write)
break;
}
return written;
return 0;
}
void PlatformBackend::file_close(PlatformBackend::FileHandle handle)