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30 lines
522 B
JavaScript
30 lines
522 B
JavaScript
module.exports = read
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var MSB = 0x80
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, REST = 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 || shift > 49) {
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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) << shift
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: (b & REST) * Math.pow(2, shift)
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shift += 7
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} while (b >= MSB)
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read.bytes = counter - offset
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return res
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}
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