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nbio: buildfix for Windows versions older than 2000

This commit is contained in:
Brad Parker 2017-11-27 17:48:07 -05:00
parent 82884b319b
commit ae6892a89a
1 changed files with 26 additions and 1 deletions
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27
libretro-common/file/nbio/nbio_windowsmmap.c
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@ -56,7 +56,11 @@ static void *nbio_mmap_win32_open(const char * filename, unsigned mode)
{
static const DWORD dispositions[] = { OPEN_EXISTING, CREATE_ALWAYS, OPEN_ALWAYS, OPEN_EXISTING, CREATE_ALWAYS };
HANDLE mem;
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
LARGE_INTEGER len;
#else
SIZE_T len;
#endif
struct nbio_mmap_win32_t* handle = NULL;
void* ptr = NULL;
bool is_write = (mode == NBIO_WRITE || mode == NBIO_UPDATE || mode == BIO_WRITE);
@ -74,17 +78,28 @@ static void *nbio_mmap_win32_open(const char * filename, unsigned mode)
if (file == INVALID_HANDLE_VALUE)
return NULL;
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
/* GetFileSizeEx is new for Windows 2000 */
GetFileSizeEx(file, &len);
mem = CreateFileMapping(file, NULL, is_write ? PAGE_READWRITE : PAGE_READONLY, 0, 0, NULL);
ptr = MapViewOfFile(mem, is_write ? (FILE_MAP_READ|FILE_MAP_WRITE) : FILE_MAP_READ, 0, 0, len.QuadPart);
#else
GetFileSize(file, &len);
mem = CreateFileMapping(file, NULL, is_write ? PAGE_READWRITE : PAGE_READONLY, 0, 0, NULL);
ptr = MapViewOfFile(mem, is_write ? (FILE_MAP_READ|FILE_MAP_WRITE) : FILE_MAP_READ, 0, 0, len);
#endif
CloseHandle(mem);
handle = (struct nbio_mmap_win32_t*)malloc(sizeof(struct nbio_mmap_win32_t));
handle->file = file;
handle->is_write = is_write;
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
handle->len = len.QuadPart;
#else
handle->len = len;
#endif
handle->ptr = ptr;
return handle;
@ -108,7 +123,11 @@ static bool nbio_mmap_win32_iterate(void *data)
static void nbio_mmap_win32_resize(void *data, size_t len)
{
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
LARGE_INTEGER len_li;
#else
SIZE_T len_li;
#endif
HANDLE mem;
struct nbio_mmap_win32_t* handle = (struct nbio_mmap_win32_t*)data;
@ -125,8 +144,14 @@ static void nbio_mmap_win32_resize(void *data, size_t len)
abort();
}
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0500
/* SetFilePointerEx is new for Windows 2000 */
len_li.QuadPart = len;
SetFilePointerEx(handle->file, len_li, NULL, FILE_BEGIN);
#else
len_li = len;
SetFilePointer(handle->file, len_li, NULL, FILE_BEGIN);
#endif
if (!SetEndOfFile(handle->file))
{