utils.go

package sftools

func RoundToBundleStartBlock(block, fileBlockSize uint32) uint32 {
	// From a non-rounded block `1085` and size of `100`, we remove from it the value of
	// `modulo % fileblock` (`85`) making it flush (`1000`).
	return block - (block % fileBlockSize)
}

func RoundToBundleEndBlock(block, fileBlockSize uint32) uint32 {
	// From a non-rounded block `1085` and size of `100`, we remove from it the value of
	// `modulo % fileblock` (`85`) making it flush (`1000`) than adding to it the last
	// merged block num value for this size which simply `size - 1` (`99`) giving us
	// a resolved formulae of `1085 - (1085 % 100) + (100 - 1) = 1085 - (85) + (99)`.
	return block - (block % fileBlockSize) + (fileBlockSize - 1)
}