Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/** This code was borrowed form cbor-x under the MIT license. */
// MIT License
// Copyright (c) 2020 Kris Zyp
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
export const decodeAscii = (src: Uint8Array, position: number, length: number): string | undefined => {
const bytes = [];
for (let i = 0; i < length; i++) {
const byte = src[position++];
if (byte & 0x80) return;
bytes.push(byte);
}
return fromCharCode.apply(String, bytes);
};
export const decodeAsciiMax15 = (src: Uint8Array, position: number, length: number): string | undefined => {
if (length < 4) {
if (length < 2) {
if (length === 0) return '';
else E{
const a = src[position++];
Iif ((a & 0x80) > 1) {
position -= 1;
return;
}
return fromCharCode(a);
}
} else {
const a = src[position++];
const b = src[position++];
Iif ((a & 0x80) > 0 || (b & 0x80) > 0) {
position -= 2;
return;
}
if (length < 3) return fromCharCode(a, b);
const c = src[position++];
Iif ((c & 0x80) > 0) {
position -= 3;
return;
}
return fromCharCode(a, b, c);
}
} else {
const a = src[position++];
const b = src[position++];
const c = src[position++];
const d = src[position++];
if ((a & 0x80) > 0 || (b & 0x80) > 0 || (c & 0x80) > 0 || (d & 0x80) > 0) {
position -= 4;
return;
}
if (length < 6) {
if (length === 4) return fromCharCode(a, b, c, d);
else {
const e = src[position++];
Iif ((e & 0x80) > 0) {
position -= 5;
return;
}
return fromCharCode(a, b, c, d, e);
}
} else if (length < 8) {
const e = src[position++];
const f = src[position++];
Iif ((e & 0x80) > 0 || (f & 0x80) > 0) {
position -= 6;
return;
}
if (length < 7) return fromCharCode(a, b, c, d, e, f);
const g = src[position++];
Iif ((g & 0x80) > 0) {
position -= 7;
return;
}
return fromCharCode(a, b, c, d, e, f, g);
} else {
const e = src[position++];
const f = src[position++];
const g = src[position++];
const h = src[position++];
Iif ((e & 0x80) > 0 || (f & 0x80) > 0 || (g & 0x80) > 0 || (h & 0x80) > 0) {
position -= 8;
return;
}
Iif (length < 10) {
if (length === 8) return fromCharCode(a, b, c, d, e, f, g, h);
else {
const i = src[position++];
Iif ((i & 0x80) > 0) {
position -= 9;
return;
}
return fromCharCode(a, b, c, d, e, f, g, h, i);
}
} else if (length < 12) {
const i = src[position++];
const j = src[position++];
Iif ((i & 0x80) > 0 || (j & 0x80) > 0) {
position -= 10;
return;
}
Iif (length < 11) return fromCharCode(a, b, c, d, e, f, g, h, i, j);
const k = src[position++];
Iif ((k & 0x80) > 0) {
position -= 11;
return;
}
return fromCharCode(a, b, c, d, e, f, g, h, i, j, k);
} else E{
const i = src[position++];
const j = src[position++];
const k = src[position++];
const l = src[position++];
Iif ((i & 0x80) > 0 || (j & 0x80) > 0 || (k & 0x80) > 0 || (l & 0x80) > 0) {
position -= 12;
return;
}
if (length < 14) {
if (length === 12) return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l);
else {
const m = src[position++];
Iif ((m & 0x80) > 0) {
position -= 13;
return;
}
return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l, m);
}
} else {
const m = src[position++];
const n = src[position++];
Iif ((m & 0x80) > 0 || (n & 0x80) > 0) {
position -= 14;
return;
}
Iif (length < 15) return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l, m, n);
const o = src[position++];
Iif ((o & 0x80) > 0) {
position -= 15;
return;
}
return fromCharCode(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o);
}
}
}
}
};
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