diff --git a/miniaudio.h b/miniaudio.h index 5bef689b..5c613f5d 100644 --- a/miniaudio.h +++ b/miniaudio.h @@ -58974,6 +58974,31 @@ MA_API ma_result ma_vfs_open_and_read_file_w(ma_vfs* pVFS, const wchar_t* pFileP #endif #if defined(MA_USE_WIN32_FILEIO) +/* +We need to dynamically load SetFilePointer or SetFilePointerEx because older versions of Windows do +not have the Ex version. We therefore need to do some dynamic branching depending on what's available. + +We load these when we load our first file from the default VFS. It's left open for the life of the +program and is left to the OS to uninitialize when the program terminates. +*/ +typedef DWORD (__stdcall * ma_SetFilePointer_proc)(HANDLE hFile, LONG lDistanceToMove, LONG* lpDistanceToMoveHigh, DWORD dwMoveMethod); +typedef BOOL (__stdcall * ma_SetFilePointerEx_proc)(HANDLE hFile, LARGE_INTEGER liDistanceToMove, LARGE_INTEGER* lpNewFilePointer, DWORD dwMoveMethod); + +static ma_handle hKernel32DLL = NULL; +static ma_SetFilePointer_proc ma_SetFilePointer = NULL; +static ma_SetFilePointerEx_proc ma_SetFilePointerEx = NULL; + +static void ma_win32_fileio_init(void) +{ + if (hKernel32DLL == NULL) { + hKernel32DLL = ma_dlopen(NULL, "kernel32.dll"); + if (hKernel32DLL != NULL) { + ma_SetFilePointer = (ma_SetFilePointer_proc) ma_dlsym(NULL, hKernel32DLL, "SetFilePointer"); + ma_SetFilePointerEx = (ma_SetFilePointerEx_proc)ma_dlsym(NULL, hKernel32DLL, "SetFilePointerEx"); + } + } +} + static void ma_default_vfs__get_open_settings_win32(ma_uint32 openMode, DWORD* pDesiredAccess, DWORD* pShareMode, DWORD* pCreationDisposition) { *pDesiredAccess = 0; @@ -59005,6 +59030,9 @@ static ma_result ma_default_vfs_open__win32(ma_vfs* pVFS, const char* pFilePath, (void)pVFS; + /* Load some Win32 symbols dynamically so we can dynamically check for the existence of SetFilePointerEx. */ + ma_win32_fileio_init(); + ma_default_vfs__get_open_settings_win32(openMode, &dwDesiredAccess, &dwShareMode, &dwCreationDisposition); hFile = CreateFileA(pFilePath, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL); @@ -59025,6 +59053,9 @@ static ma_result ma_default_vfs_open_w__win32(ma_vfs* pVFS, const wchar_t* pFile (void)pVFS; + /* Load some Win32 symbols dynamically so we can dynamically check for the existence of SetFilePointerEx. */ + ma_win32_fileio_init(); + ma_default_vfs__get_open_settings_win32(openMode, &dwDesiredAccess, &dwShareMode, &dwCreationDisposition); hFile = CreateFileW(pFilePath, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL); @@ -59150,16 +59181,19 @@ static ma_result ma_default_vfs_seek__win32(ma_vfs* pVFS, ma_vfs_file file, ma_i dwMoveMethod = FILE_BEGIN; } -#if (defined(_MSC_VER) && _MSC_VER <= 1200) || defined(__DMC__) - /* No SetFilePointerEx() so restrict to 31 bits. */ - if (origin > 0x7FFFFFFF) { - return MA_OUT_OF_RANGE; + if (ma_SetFilePointerEx != NULL) { + result = ma_SetFilePointerEx((HANDLE)file, liDistanceToMove, NULL, dwMoveMethod); + } else if (ma_SetFilePointer != NULL) { + /* No SetFilePointerEx() so restrict to 31 bits. */ + if (origin > 0x7FFFFFFF) { + return MA_OUT_OF_RANGE; + } + + result = ma_SetFilePointer((HANDLE)file, (LONG)liDistanceToMove.QuadPart, NULL, dwMoveMethod); + } else { + return MA_NOT_IMPLEMENTED; } - result = SetFilePointer((HANDLE)file, (LONG)liDistanceToMove.QuadPart, NULL, dwMoveMethod); -#else - result = SetFilePointerEx((HANDLE)file, liDistanceToMove, NULL, dwMoveMethod); -#endif if (result == 0) { return ma_result_from_GetLastError(GetLastError()); } @@ -59172,20 +59206,22 @@ static ma_result ma_default_vfs_tell__win32(ma_vfs* pVFS, ma_vfs_file file, ma_i LARGE_INTEGER liZero; LARGE_INTEGER liTell; BOOL result; -#if (defined(_MSC_VER) && _MSC_VER <= 1200) || defined(__DMC__) - LONG tell; -#endif (void)pVFS; liZero.QuadPart = 0; -#if (defined(_MSC_VER) && _MSC_VER <= 1200) || defined(__DMC__) - result = SetFilePointer((HANDLE)file, (LONG)liZero.QuadPart, &tell, FILE_CURRENT); - liTell.QuadPart = tell; -#else - result = SetFilePointerEx((HANDLE)file, liZero, &liTell, FILE_CURRENT); -#endif + if (ma_SetFilePointerEx != NULL) { + result = ma_SetFilePointerEx((HANDLE)file, liZero, &liTell, FILE_CURRENT); + } else if (ma_SetFilePointer != NULL) { + LONG tell; + + result = ma_SetFilePointer((HANDLE)file, (LONG)liZero.QuadPart, &tell, FILE_CURRENT); + liTell.QuadPart = tell; + } else { + return MA_NOT_IMPLEMENTED; + } + if (result == 0) { return ma_result_from_GetLastError(GetLastError()); }