This buffered reader is optimized for reading append-only files with dangling links to previous content.

Chunks of data are read starting at the end but interpretation of data takes is done from left to right. Thus, this reader can be used as bufio.Reader but internal buffering is filled with content at lower offsets.

This backward reader may be used with size endian records, where the field storing the size of the record is at the end.

go get github.com/jeroiraz/goback

package main

import (
  "os"
  "github.com/jeroiraz/goback"
)

func main() {
  f, _ := os.Open("file")
  defer f.Close()

  reader, _ := goback.NewFileReader(f)

  // Read last 32 bytes from input file
  buf := make([]byte, 32)
  reader.Read(buf)
}