storage/file-misc.go

   1 package storage
   2
   3 import "github.com/anacrolix/torrent/metainfo"
   4
   5 type requiredLength struct {
   6         fileIndex int
   7         length    int64
   8 }
   9
  10 func extentCompleteRequiredLengths(info *metainfo.Info, off, n int64) (ret []requiredLength) {
  11         if n == 0 {
  12                 return
  13         }
  14         for i, fi := range info.UpvertedFiles() {
  15                 if off >= fi.Length {
  16                         off -= fi.Length
  17                         continue
  18                 }
  19                 n1 := n
  20                 if off+n1 > fi.Length {
  21                         n1 = fi.Length - off
  22                 }
  23                 ret = append(ret, requiredLength{
  24                         fileIndex: i,
  25                         length:    off + n1,
  26                 })
  27                 n -= n1
  28                 if n == 0 {
  29                         return
  30                 }
  31                 off = 0
  32         }
  33         panic("extent exceeds torrent bounds")
  34 }