43 lines
1023 B
Go
43 lines
1023 B
Go
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package fusefrontend_reverse
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import (
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"crypto/sha256"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/hanwen/go-fuse/fuse/nodefs"
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"github.com/rfjakob/gocryptfs/internal/nametransform"
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)
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// deriveDirIV derives the DirIV from the directory path by simply hashing it
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func deriveDirIV(dirPath string) []byte {
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hash := sha256.Sum256([]byte(dirPath))
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return hash[:nametransform.DirIVLen]
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}
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type dirIVFile struct {
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// Embed nodefs.defaultFile for a ENOSYS implementation of all methods
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nodefs.File
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// file content
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content []byte
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}
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func NewDirIVFile(dirPath string) (nodefs.File, fuse.Status) {
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return &dirIVFile{
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File: nodefs.NewDefaultFile(),
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content: deriveDirIV(dirPath),
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}, fuse.OK
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}
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// Read - FUSE call
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func (f *dirIVFile) Read(buf []byte, off int64) (resultData fuse.ReadResult, status fuse.Status) {
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if off >= int64(len(f.content)) {
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return nil, fuse.OK
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}
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end := int(off) + len(buf)
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if end > len(f.content) {
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end = len(f.content)
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}
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return fuse.ReadResultData(f.content[off:end]), fuse.OK
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}
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