1 | scope byteArrayFromBase128Utf8 |
2 | |
3 | static int #byteFromArray(byte[] data, int i) { |
4 | ret i >= data.length ? 0 : ubyteToInt(data[i]); |
5 | } |
6 | |
7 | static byte[] byteArrayFromBase128Utf8(byte[] data) { |
8 | int n = l(data); |
9 | bool anomaly = (n & 7) == 1 && (data[n-1] & 1) != 0; |
10 | int n2 = anomaly ? n-1 : n; |
11 | int nOut = toInt(n2*7L/8); |
12 | byte[] out = new byte[nOut]; |
13 | int iIn = 0, iOut = 0; |
14 | while (iIn < n2) { |
15 | // take all 7 bits of byte 0 + top bit of byte 1 |
16 | out[iOut++] = (byte) (data[iIn] << (8-1) | ubyteToInt(data[iIn+1]) >> (8-1); |
17 | if (++iIn >= n2) break; |
18 | // take bottom bit of byte 0 + top 6 bits of byte 1 |
19 | out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn) << (7-1) | byteFromArray(data, iIn+1) >> (8-6)); |
20 | if (++iOut >= nOut) break; |
21 | // take bottom 2 bits of byte 1 + top 5 bits of byte 2 |
22 | out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+1) << (7-2) | byteFromArray(data, iIn+2) >> (8-5)); |
23 | if (++iOut >= nOut) break; |
24 | // take bottom 3 bits of byte 2 + top 4 bits of byte 3 |
25 | out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+2) << (7-3) | byteFromArray(data, iIn+3) >> (8-4)); |
26 | if (++iOut >= nOut) break; |
27 | // take bottom 4 bits of byte 3 + top 3 bits of byte 4 |
28 | out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+3) << (7-4) | byteFromArray(data, iIn+4) >> (8-3)); |
29 | if (++iOut >= nOut) break; |
30 | // take bottom 5 bits of byte 4 + top 2 bits of byte 5 |
31 | out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+4) << (7-5) | byteFromArray(data, iIn+5) >> (8-2)); |
32 | if (++iOut >= nOut) break; |
33 | // take bottom 6 bits of byte 5 + top bit of byte 6 |
34 | out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+5) << (7-6) | byteFromArray(data, iIn+6) >> (8-1)); |
35 | if (++iOut >= nOut) break; |
36 | // take bottom 7 bits of byte 6 |
37 | out[iOut] = (byte) (0x7F & byteFromArray(data, iIn+6)); |
38 | if (++iOut >= nOut) break; |
39 | iIn += 7; |
40 | } |
41 | ret out; |
42 | } |
Began life as a copy of #1035231
download show line numbers debug dex old transpilations
Travelled to 3 computer(s): bhatertpkbcr, mowyntqkapby, mqqgnosmbjvj
No comments. add comment
Snippet ID: | #1035232 |
Snippet name: | byteArrayFromBase128Utf8 - see byteArrayToBase128Utf8 [dev.] |
Eternal ID of this version: | #1035232/2 |
Text MD5: | 7f4a84a2423b3d4ac5d72885adabb015 |
Author: | stefan |
Category: | javax |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2022-04-18 04:11:58 |
Source code size: | 1937 bytes / 42 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 120 / 135 |
Version history: | 1 change(s) |
Referenced in: | [show references] |