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39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
// +build !windows
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package headerfs
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import "fmt"
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// singleTruncate truncates a single header from the end of the header file.
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// This can be used in the case of a re-org to remove the last header from the
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// end of the main chain.
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//
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// TODO(roasbeef): define this and the two methods above on a headerFile
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// struct?
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func (h *headerStore) singleTruncate() error {
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// In order to truncate the file, we'll need to grab the absolute size
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// of the file as it stands currently.
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fileInfo, err := h.file.Stat()
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if err != nil {
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return err
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}
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fileSize := fileInfo.Size()
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// Next, we'll determine the number of bytes we need to truncate from
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// the end of the file.
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var truncateLength int64
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switch h.indexType {
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case Block:
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truncateLength = 80
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case RegularFilter:
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truncateLength = 32
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default:
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return fmt.Errorf("unknown index type: %v", h.indexType)
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}
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// Finally, we'll use both of these values to calculate the new size of
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// the file and truncate it accordingly.
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newSize := fileSize - truncateLength
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return h.file.Truncate(newSize)
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}
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