1// reduce buffer size, avoiding mem copy
 2export function shrinkBuf (buf, size) {
 3  if (buf.length === size) { return buf; }
 4  if (buf.subarray) { return buf.subarray(0, size); }
 5  buf.length = size;
 6  return buf;
 7};
 8
 9
10export function arraySet (dest, src, src_offs, len, dest_offs) {
11  if (src.subarray && dest.subarray) {
12    dest.set(src.subarray(src_offs, src_offs + len), dest_offs);
13    return;
14  }
15  // Fallback to ordinary array
16  for (var i = 0; i < len; i++) {
17    dest[dest_offs + i] = src[src_offs + i];
18  }
19}
20
21// Join array of chunks to single array.
22export function flattenChunks (chunks) {
23  var i, l, len, pos, chunk, result;
24
25  // calculate data length
26  len = 0;
27  for (i = 0, l = chunks.length; i < l; i++) {
28    len += chunks[i].length;
29  }
30
31  // join chunks
32  result = new Uint8Array(len);
33  pos = 0;
34  for (i = 0, l = chunks.length; i < l; i++) {
35    chunk = chunks[i];
36    result.set(chunk, pos);
37    pos += chunk.length;
38  }
39
40  return result;
41}
42
43export var Buf8  = Uint8Array;
44export var Buf16 = Uint16Array;
45export var Buf32 = Int32Array;