Release v0.1.0

vendor/github.com/lightninglabs/neutrino/headerfs/truncate_windows.go

@@ -0,0 +1,56 @@
+// +build windows
+
+package headerfs
+
+import (
+	"fmt"
+	"os"
+)
+
+// singleTruncate truncates a single header from the end of the header file.
+// This can be used in the case of a re-org to remove the last header from the
+// end of the main chain.
+//
+// TODO(roasbeef): define this and the two methods above on a headerFile
+// struct?
+func (h *headerStore) singleTruncate() error {
+	// In order to truncate the file, we'll need to grab the absolute size
+	// of the file as it stands currently.
+	fileInfo, err := h.file.Stat()
+	if err != nil {
+		return err
+	}
+	fileSize := fileInfo.Size()
+
+	// Next, we'll determine the number of bytes we need to truncate from
+	// the end of the file.
+	var truncateLength int64
+	switch h.indexType {
+	case Block:
+		truncateLength = 80
+	case RegularFilter:
+		truncateLength = 32
+	default:
+		return fmt.Errorf("unknown index type: %v", h.indexType)
+	}
+
+	// Finally, we'll use both of these values to calculate the new size of
+	// the file.
+	newSize := fileSize - truncateLength
+
+	// On Windows, a file can't be truncated while open, even if using a
+	// file handle to truncate it. This means we have to close, truncate,
+	// and reopen it.
+	fileName := h.file.Name()
+	if err = h.file.Close(); err != nil {
+		return err
+	}
+
+	if err = os.Truncate(fileName, newSize); err != nil {
+		return err
+	}
+
+	fileFlags := os.O_RDWR | os.O_APPEND | os.O_CREATE
+	h.file, err = os.OpenFile(fileName, fileFlags, 0644)
+	return err
+}