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32 lines
665 B
32 lines
665 B
//go:build windows
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package capacity
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import (
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"fmt"
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"syscall"
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"unsafe"
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)
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var getDiskFreeSpaceEx = syscall.NewLazyDLL("kernel32.dll").NewProc("GetDiskFreeSpaceExW")
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func filesystemFreeBytes(path string) (int64, error) {
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pathUTF16, err := syscall.UTF16PtrFromString(path)
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if err != nil {
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return 0, err
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}
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var available uint64
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result, _, callErr := getDiskFreeSpaceEx.Call(
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uintptr(unsafe.Pointer(pathUTF16)),
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uintptr(unsafe.Pointer(&available)),
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0,
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0,
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)
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if result == 0 {
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return 0, fmt.Errorf("GetDiskFreeSpaceExW: %w", callErr)
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}
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if available > uint64(^uint64(0)>>1) {
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return int64(^uint64(0) >> 1), nil
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}
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return int64(available), nil
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}
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