|
1
|
|
|
/* |
|
2
|
|
|
* Copyright (c) 2017-2018 Rafael da Silva Rocha. |
|
3
|
|
|
* |
|
4
|
|
|
* Permission is hereby granted, free of charge, to any person obtaining |
|
5
|
|
|
* a copy of this software and associated documentation files (the |
|
6
|
|
|
* "Software"), to deal in the Software without restriction, including |
|
7
|
|
|
* without limitation the rights to use, copy, modify, merge, publish, |
|
8
|
|
|
* distribute, sublicense, and/or sell copies of the Software, and to |
|
9
|
|
|
* permit persons to whom the Software is furnished to do so, subject to |
|
10
|
|
|
* the following conditions: |
|
11
|
|
|
* |
|
12
|
|
|
* The above copyright notice and this permission notice shall be |
|
13
|
|
|
* included in all copies or substantial portions of the Software. |
|
14
|
|
|
* |
|
15
|
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
|
16
|
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
|
17
|
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
|
18
|
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
|
19
|
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
|
20
|
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
|
21
|
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
|
22
|
|
|
* |
|
23
|
|
|
*/ |
|
24
|
|
|
|
|
25
|
|
|
/** |
|
26
|
|
|
* @fileoverview A function to swap endianness in byte buffers. |
|
27
|
|
|
* @see https://github.com/rochars/byte-data |
|
28
|
|
|
*/ |
|
29
|
|
|
|
|
30
|
|
|
/** |
|
31
|
|
|
* Swap the byte ordering in a buffer. The buffer is modified in place. |
|
32
|
|
|
* @param {!(Array<number>|Uint8Array)} bytes The bytes. |
|
33
|
|
|
* @param {number} offset The byte offset. |
|
34
|
|
|
* @param {number=} [start=0] The start index. |
|
35
|
|
|
* @param {number=} [end=bytes.length] The end index. |
|
36
|
|
|
*/ |
|
37
|
|
|
export function endianness(bytes, offset, start=0, end=bytes.length) { |
|
38
|
|
|
for (let index = start; index < end; index += offset) { |
|
39
|
|
|
swap_(bytes, offset, index); |
|
40
|
|
|
} |
|
41
|
|
|
} |
|
42
|
|
|
|
|
43
|
|
|
/** |
|
44
|
|
|
* Swap the byte order of a value in a buffer. The buffer is modified in place. |
|
45
|
|
|
* @param {!(Array<number>|Uint8Array)} bytes The bytes. |
|
46
|
|
|
* @param {number} offset The byte offset. |
|
47
|
|
|
* @param {number} index The start index. |
|
48
|
|
|
* @private |
|
49
|
|
|
*/ |
|
50
|
|
|
function swap_(bytes, offset, index) { |
|
51
|
|
|
offset--; |
|
52
|
|
|
for(let x = 0; x < offset; x++) { |
|
53
|
|
|
/** @type {number} */ |
|
54
|
|
|
let theByte = bytes[index + x]; |
|
55
|
|
|
bytes[index + x] = bytes[index + offset]; |
|
56
|
|
|
bytes[index + offset] = theByte; |
|
57
|
|
|
offset--; |
|
58
|
|
|
} |
|
59
|
|
|
} |
|
60
|
|
|
|
rochars /
byte-data
