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package main
import (
"bytes"
"io"
)
type FakeFile struct {
buffer bytes.Buffer
offset int64
}
func (f *FakeFile) Read(p []byte) (n int, err error) {
n, err = f.buffer.ReadAt(p, f.offset)
f.offset += int64(n)
return n, err
}
func (f *FakeFile) Write(p []byte) (n int, err error) {
n, err = f.buffer.WriteAt(p, f.offset)
f.offset += int64(n)
return n, err
}
func (f *FakeFile) Seek(offset int64, whence int) (int64, error) {
newOffset := f.offset
switch whence {
case io.SeekStart:
newOffset = offset
case io.SeekCurrent:
newOffset += offset
case io.SeekEnd:
newOffset = int64(f.buffer.Len()) + offset
default:
return 0, io.ErrInvalidWhence
}
if newOffset < 0 {
return 0, io.ErrInvalidWhence
}
f.offset = newOffset
return f.offset, nil
}
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