From 9078a77850dd680bfa938d9ed7c83600a60c0e7b Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sat, 6 Feb 2016 19:27:59 +0100
Subject: Move pathfs_frontend to internal/fusefrontend

"git status" for reference:

renamed:    pathfs_frontend/args.go -> internal/fusefrontend/args.go
renamed:    pathfs_frontend/compat_darwin.go -> internal/fusefrontend/compat_darwin.go
renamed:    pathfs_frontend/compat_linux.go -> internal/fusefrontend/compat_linux.go
renamed:    pathfs_frontend/file.go -> internal/fusefrontend/file.go
renamed:    pathfs_frontend/file_holes.go -> internal/fusefrontend/file_holes.go
renamed:    pathfs_frontend/fs.go -> internal/fusefrontend/fs.go
renamed:    pathfs_frontend/fs_dir.go -> internal/fusefrontend/fs_dir.go
renamed:    pathfs_frontend/names.go -> internal/fusefrontend/names.go
renamed:    pathfs_frontend/write_lock.go -> internal/fusefrontend/write_lock.go
modified:   main.go
---
 internal/fusefrontend/file_holes.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 internal/fusefrontend/file_holes.go

(limited to 'internal/fusefrontend/file_holes.go')

diff --git a/internal/fusefrontend/file_holes.go b/internal/fusefrontend/file_holes.go
new file mode 100644
index 0000000..0259ae9
--- /dev/null
+++ b/internal/fusefrontend/file_holes.go
@@ -0,0 +1,29 @@
+package fusefrontend
+
+// Helper functions for sparse files (files with holes)
+
+import (
+	"github.com/hanwen/go-fuse/fuse"
+
+	"github.com/rfjakob/gocryptfs/internal/toggledlog"
+)
+
+// Will a write to offset "off" create a file hole?
+func (f *file) createsHole(plainSize uint64, off int64) bool {
+	nextBlock := f.contentEnc.PlainOffToBlockNo(plainSize)
+	targetBlock := f.contentEnc.PlainOffToBlockNo(uint64(off))
+	if targetBlock > nextBlock {
+		return true
+	}
+	return false
+}
+
+// Zero-pad the file of size plainSize to the next block boundary
+func (f *file) zeroPad(plainSize uint64) fuse.Status {
+	lastBlockLen := plainSize % f.contentEnc.PlainBS()
+	missing := f.contentEnc.PlainBS() - lastBlockLen
+	pad := make([]byte, missing)
+	toggledlog.Debug.Printf("zeroPad: Writing %d bytes\n", missing)
+	_, status := f.doWrite(pad, int64(plainSize))
+	return status
+}
-- 
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