25 lines
741 B
JavaScript
25 lines
741 B
JavaScript
const binding = require('../binding')
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const checked = require('./checked')
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exports.byteLength = function byteLength(string) {
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let len = string.length
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if (string.charCodeAt(len - 1) === 0x3d) len--
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if (len > 1 && string.charCodeAt(len - 1) === 0x3d) len--
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return (len * 3) >>> 2
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}
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exports.toString = function toString(buffer, start = 0, end = buffer.byteLength) {
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return binding.toStringBase64(buffer.buffer, buffer.byteOffset + start, end - start)
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}
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exports.write = function write(buffer, string, start = 0, end = buffer.byteLength) {
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const written = checked(
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binding.writeBase64(buffer.buffer, buffer.byteOffset + start, end - start, string)
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)
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if (written < 0) throw new Error('Invalid input')
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return written
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}
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