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scope byteArrayToBase128Utf8 static int #byteFromArray(byte[] data, int i) { ret i >= data.length ? 0 : ubyteToInt(data[i]); } static byte[] byteArrayToBase128Utf8(byte[] data) { int n = l(data); bool anomaly = (n%7) == 0; int nOut = toInt((n*8L+6)/7); byte[] out = new byte[anomaly ? nOut+1 : nOut]; int iIn = 0, iOut = 0; while (iOut < nOut) { // take top 7 bits of byte 0 out[iOut] = (byte) (byteFromArray(data, iIn) >> (8-7)); if (++iOut >= nOut) break; // take bottom bit of byte 0 + top 6 bits of byte 1 out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn) << (7-1) | byteFromArray(data, iIn+1) >> (8-6)); if (++iOut >= nOut) break; // take bottom 2 bits of byte 1 + top 5 bits of byte 2 out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+1) << (7-2) | byteFromArray(data, iIn+2) >> (8-5)); if (++iOut >= nOut) break; // take bottom 3 bits of byte 2 + top 4 bits of byte 3 out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+2) << (7-3) | byteFromArray(data, iIn+3) >> (8-4)); if (++iOut >= nOut) break; // take bottom 4 bits of byte 3 + top 3 bits of byte 4 out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+3) << (7-4) | byteFromArray(data, iIn+4) >> (8-3)); if (++iOut >= nOut) break; // take bottom 5 bits of byte 4 + top 2 bits of byte 5 out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+4) << (7-5) | byteFromArray(data, iIn+5) >> (8-2)); if (++iOut >= nOut) break; // take bottom 6 bits of byte 5 + top bit of byte 6 out[iOut] = (byte) (0x7F & (byteFromArray(data, iIn+5) << (7-6) | byteFromArray(data, iIn+6) >> (8-1)); if (++iOut >= nOut) break; // take bottom 7 bits of byte 6 out[iOut] = (byte) (0x7F & byteFromArray(data, iIn+6)); if (++iOut >= nOut) break; iIn += 7; } if (anomaly) out[iOut] = (byte) 0xFF; ret out; }
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Snippet ID: | #1035231 |
Snippet name: | byteArrayToBase128Utf8 |
Eternal ID of this version: | #1035231/11 |
Text MD5: | c4127e594ff30a4f525822176f71ef2d |
Transpilation MD5: | 9ba8499a1cb14ef234cdf6a5cd790cc3 |
Author: | stefan |
Category: | javax |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2022-04-18 04:02:49 |
Source code size: | 1909 bytes / 43 lines |
Pitched / IR pitched: | No / No |
Views / Downloads: | 168 / 279 |
Version history: | 10 change(s) |
Referenced in: | #1006654 - Standard functions list 2 (LIVE, continuation of #761) #1035232 - byteArrayFromBase128Utf8 - see byteArrayToBase128Utf8 [dev.] |