Add 'x/' from commit 'a10a11b9d371f36b7c3510da32a1d70b74e27bd1'

git-subtree-dir: x
git-subtree-mainline: 7d05a6ee8f
git-subtree-split: a10a11b9d3

x/utils/upload/upload.go

@@ -0,0 +1,27 @@
+package upload
+
+import (
+	"iter"
+
+	"golang.org/x/exp/constraints"
+)
+
+type Chunk[I constraints.Integer] struct {
+	Offset I
+	Size   I
+}
+
+// Chunks yields a sequence of a part number and a Chunk. The Chunk is the offset
+// and size of the chunk. The last chunk may be smaller than chunkSize if size is
+// not a multiple of chunkSize.
+//
+// The first part number is 1 and increases monotonically.
+func Chunks[I constraints.Integer](size, chunkSize I) iter.Seq2[int, Chunk[I]] {
+	return func(yield func(int, Chunk[I]) bool) {
+		var n int
+		for off := I(0); off < size; off += chunkSize {
+			n++
+			yield(n, Chunk[I]{off, min(chunkSize, size-off)})
+		}
+	}
+}