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27 lines
452 B
JavaScript

module.exports = encode
var MSB = 0x80
, REST = 0x7F
, MSBALL = ~REST
, INT = Math.pow(2, 31)
function encode(num, out, offset) {
out = out || []
offset = offset || 0
var oldOffset = offset
while(num >= INT) {
out[offset++] = (num & 0xFF) | MSB
num /= 128
}
while(num & MSBALL) {
out[offset++] = (num & 0xFF) | MSB
num >>>= 7
}
out[offset] = num | 0
encode.bytes = offset - oldOffset + 1
return out
}