// If the lines immediately before those in the block move are identical,
// then grow the block move by one and repeat.
func GrowBackwards(p *dm.BlockMatch, aLines, bLines []dm.LinePos) {
glog.Infof("GrowBackwards: dm.BlockMatch = %v", *p)
aLimit, bLimit := aLines[0].Index, bLines[0].Index
glog.Infof("GrowBackwards aLimit=%d, bLimit=%d", aLimit, bLimit)
a := findLineWithIndex(aLines, p.AIndex)
b := findLineWithIndex(bLines, p.BIndex)
glog.Infof("GrowBackwards a=%d, b=%d", a, b)
if aLines[a].Hash != bLines[b].Hash {
glog.Fatalf("GrowBackwards: Lines %d and %d should have the same hash", a, b)
}
growBy := 0
for a > aLimit && b > bLimit {
a--
b--
if aLines[a].Hash != bLines[b].Hash {
break
}
growBy++
}
glog.Infof("GrowBackwards growBy=%d", growBy)
p.AIndex -= growBy
p.BIndex -= growBy
p.Length += growBy
}
// If the lines immediately after those in the block move are identical,
// then grow the block move by one and repeat.
func GrowForwards(p *dm.BlockMatch, aLines, bLines []dm.LinePos) {
glog.Infof("GrowForwards: dm.BlockMatch = %v", *p)
aLimit := aLines[len(aLines)-1].Index
bLimit := bLines[len(bLines)-1].Index
glog.Infof("GrowForwards aLimit=%d, bLimit=%d", aLimit, bLimit)
a := findLineWithIndex(aLines, p.AIndex+p.Length-1)
b := findLineWithIndex(bLines, p.BIndex+p.Length-1)
glog.Infof("GrowForwards a=%d, b=%d", a, b)
if aLines[a].Hash != bLines[b].Hash {
glog.Fatalf("GrowForwards: Lines %d and %d should have the same hash", a, b)
}
growBy := 0
for a < aLimit && b < bLimit {
a++
b++
if aLines[a].Hash != bLines[b].Hash {
break
}
growBy++
}
glog.Infof("GrowForwards growBy=%d", growBy)
p.Length += growBy
}
