92 lines
1.6 KiB
JavaScript
92 lines
1.6 KiB
JavaScript
var encode_1 = encode;
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var MSB = 0x80
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, REST = 0x7F
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, MSBALL = ~REST
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, 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 & 0xFF) | 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 & 0xFF) | 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 = 0x80
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, REST$1 = 0x7F;
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function read(buf, offset) {
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var res = 0
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, offset = offset || 0
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, shift = 0
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, counter = offset
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, b
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, 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
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? (b & REST$1) << shift
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: (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 (
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value < N1 ? 1
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: value < N2 ? 2
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: value < N3 ? 3
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: value < N4 ? 4
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: value < N5 ? 5
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: value < N6 ? 6
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: value < N7 ? 7
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: value < N8 ? 8
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: value < N9 ? 9
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: 10
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)
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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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export default _brrp_varint;
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