40 lines
921 B
Go
40 lines
921 B
Go
package copyfile
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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 (
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modkernel32 = syscall.NewLazyDLL("kernel32.dll")
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procCopyFileW = modkernel32.NewProc("CopyFileW")
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)
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// CopyFile is a utility for copying a file - used for the LCOW scratch cache.
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// Uses CopyFileW win32 API for performance.
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func CopyFile(srcFile, destFile string, overwrite bool) error {
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var bFailIfExists uint32 = 1
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if overwrite {
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bFailIfExists = 0
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}
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lpExistingFileName, err := syscall.UTF16PtrFromString(srcFile)
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if err != nil {
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return err
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}
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lpNewFileName, err := syscall.UTF16PtrFromString(destFile)
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if err != nil {
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return err
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}
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r1, _, err := syscall.Syscall(
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procCopyFileW.Addr(),
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3,
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uintptr(unsafe.Pointer(lpExistingFileName)),
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uintptr(unsafe.Pointer(lpNewFileName)),
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uintptr(bFailIfExists))
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if r1 == 0 {
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return fmt.Errorf("failed CopyFileW Win32 call from '%s' to '%s': %s", srcFile, destFile, err)
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}
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return nil
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}
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