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Address bug in inmemory filesystem WriteAt method

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This commit is contained in:
Stephen J Day 2014-12-08 21:08:07 -08:00
parent f3f70d151d
commit 45c29be442
1 changed files with 8 additions and 7 deletions
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15
storagedriver/inmemory/mfs.go
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@ -294,15 +294,16 @@ func (f *file) ReadAt(p []byte, offset int64) (n int, err error) {
}
func (f *file) WriteAt(p []byte, offset int64) (n int, err error) {
if len(f.data) > 0 && offset >= int64(len(f.data)) {
// Extend missing region with a zero pad, while also preallocating out to size of p.
pad := offset - int64(len(f.data))
size := len(p) + int(pad)
f.data = append(f.data, make([]byte, pad, size)...)
off := int(offset)
if cap(f.data) < off+len(p) {
data := make([]byte, len(f.data), off+len(p))
copy(data, f.data)
f.data = data
}
f.data = append(f.data, p...)
return len(p), nil
f.data = f.data[:off+len(p)]
return copy(f.data[off:off+len(p)], p), nil
}
func (f *file) String() string {