58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
'use strict';
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var encode_1 = encode;
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var MSB = 128, REST = 127, MSBALL = ~REST, INT = Math.pow(2, 31);
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function encode(num, out, offset) {
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out = out || [];
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offset = offset || 0;
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var oldOffset = offset;
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while (num >= INT) {
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out[offset++] = num & 255 | MSB;
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num /= 128;
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}
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while (num & MSBALL) {
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out[offset++] = num & 255 | MSB;
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num >>>= 7;
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}
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out[offset] = num | 0;
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encode.bytes = offset - oldOffset + 1;
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return out;
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}
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var decode = read;
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var MSB$1 = 128, REST$1 = 127;
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function read(buf, offset) {
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var res = 0, offset = offset || 0, shift = 0, counter = offset, b, l = buf.length;
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do {
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if (counter >= l) {
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read.bytes = 0;
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throw new RangeError('Could not decode varint');
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}
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b = buf[counter++];
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res += shift < 28 ? (b & REST$1) << shift : (b & REST$1) * Math.pow(2, shift);
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shift += 7;
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} while (b >= MSB$1);
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read.bytes = counter - offset;
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return res;
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}
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var N1 = Math.pow(2, 7);
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var N2 = Math.pow(2, 14);
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var N3 = Math.pow(2, 21);
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var N4 = Math.pow(2, 28);
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var N5 = Math.pow(2, 35);
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var N6 = Math.pow(2, 42);
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var N7 = Math.pow(2, 49);
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var N8 = Math.pow(2, 56);
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var N9 = Math.pow(2, 63);
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var length = function (value) {
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return value < N1 ? 1 : value < N2 ? 2 : value < N3 ? 3 : value < N4 ? 4 : value < N5 ? 5 : value < N6 ? 6 : value < N7 ? 7 : value < N8 ? 8 : value < N9 ? 9 : 10;
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};
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var varint = {
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encode: encode_1,
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decode: decode,
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encodingLength: length
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};
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var _brrp_varint = varint;
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var varint$1 = _brrp_varint;
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module.exports = varint$1;
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