Ah, and I just found another version, somewhat simpler, that just reads bytes in reverse:
https://play.golang.org/p/mYsP7iHmiW On 4 August 2017 at 16:43, roger peppe <rogpe...@gmail.com> wrote: > I wrote this code a while ago to accomplish a similar task > (actually I wanted to scan lines in reverse, but it works > for bytes too, because it works with bufio.ScanBytes): > > https://play.golang.org/p/dqmlmdqk9k > > If you were going to use it in production, it would > need lots of tests - it may well be wrong! Also, I've > no idea what its performance characteristics are - I'm > sure it would not be hard to make a reverse byte reader > optimised for that purpose that was considerably > more efficient. > > Hope this helps, > > rog. > > > On 4 August 2017 at 16:01, <zack.sch...@gmail.com> wrote: >> I'm working on a finite state machine that processes a file byte by byte, >> without loading the entire file into memory. Currently it works in the >> forward direction, but I'd like to get it working in the reverse direction >> as well. Currently I make a *bufio.Readerfrom a open file / response body >> and then use ReadByte() to get each byte from beginning to end. >> >> >> I'm wondering, what is the best way to get each byte starting from the end >> and going to the beginning? My first idea to read backwards is to use a >> combination of UnreadByte() and Peek(1) to read in reverse after advancing >> the reader to the end. I'd like to avoid reading in the whole file into >> memory. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golang-nuts+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
