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29 lines
522 B
29 lines
522 B
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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