Refactor ciphertext <-> plaintext offset translation functions

Move all the intelligence into the new file address_translation.go.
That the calculations were spread out too much became apparent when adding
the file header. This should make the code much easier to modify in the
future.

1 files changed, 2 insertions, 2 deletions

diff --git a/pathfs_frontend/file_holes.go b/pathfs_frontend/file_holes.go
index f906aa6..3db4828 100644
--- a/pathfs_frontend/file_holes.go
+++ b/pathfs_frontend/file_holes.go
@@ -7,8 +7,8 @@ import (
 
 // Will a write to offset "off" create a file hole?
 func (f *file) createsHole(plainSize uint64, off int64) bool {
-	nextBlock := f.cfs.BlockNoPlainOff(plainSize)
-	targetBlock := f.cfs.BlockNoPlainOff(uint64(off))
+	nextBlock := f.cfs.PlainOffToBlockNo(plainSize)
+	targetBlock := f.cfs.PlainOffToBlockNo(uint64(off))
 	if targetBlock > nextBlock {
 		return true
 	}