diff options
| -rw-r--r-- | lib/blocks.go | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/blocks.go b/lib/blocks.go index a82feb2..76f39d6 100644 --- a/lib/blocks.go +++ b/lib/blocks.go @@ -72,6 +72,20 @@ func CipherUsesECB(bs []byte) []byte { return nil } +// Returns (index, found); where `index` is the starting index of the +// consecutive matching blocks; `index` is -1 when consective matching +// blocks are not found. +func HasConsecutiveMatchingBlocks(bs []byte, bsize int) (int, bool) { + blocks := BreakIntoBlocks(bs, bsize) + + for i := 0; i < len(blocks)-1; i++ { + if BlocksEqual(blocks[i], blocks[i+1]) { + return i * bsize, true + } + } + return -1, false +} + func hasMatchingBlock(id int, blocks [][]byte) bool { for i := 0; i < len(blocks); i++ { if i == id { |