30 lines
858 B
Go
30 lines
858 B
Go
package pathfs_frontend
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// Helper functions for sparse files (files with holes)
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import (
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"github.com/hanwen/go-fuse/fuse"
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"github.com/rfjakob/gocryptfs/internal/toggledlog"
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)
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// Will a write to offset "off" create a file hole?
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func (f *file) createsHole(plainSize uint64, off int64) bool {
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nextBlock := f.contentEnc.PlainOffToBlockNo(plainSize)
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targetBlock := f.contentEnc.PlainOffToBlockNo(uint64(off))
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if targetBlock > nextBlock {
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return true
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}
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return false
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}
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// Zero-pad the file of size plainSize to the next block boundary
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func (f *file) zeroPad(plainSize uint64) fuse.Status {
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lastBlockLen := plainSize % f.contentEnc.PlainBS()
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missing := f.contentEnc.PlainBS() - lastBlockLen
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pad := make([]byte, missing)
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toggledlog.Debug.Printf("zeroPad: Writing %d bytes\n", missing)
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_, status := f.doWrite(pad, int64(plainSize))
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return status
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}
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