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* fix: base32 and base64 feat: base32hex, base32pad, base32hexpad, base64urlpad, base64pad * test: add base16 tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| 'use strict' | ||
|
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| function decode (input, alphabet) { | ||
| input = input.replace(new RegExp('=', 'g'), '') | ||
| let length = input.length | ||
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| let bits = 0 | ||
| let value = 0 | ||
|
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| let index = 0 | ||
| let output = new Uint8Array((length * 5 / 8) | 0) | ||
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| for (let i = 0; i < length; i++) { | ||
| value = (value << 5) | alphabet.indexOf(input[i]) | ||
| bits += 5 | ||
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| if (bits >= 8) { | ||
| output[index++] = (value >>> (bits - 8)) & 255 | ||
| bits -= 8 | ||
| } | ||
| } | ||
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| return output.buffer | ||
| } | ||
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| function encode (buffer, alphabet) { | ||
| let length = buffer.byteLength | ||
| let view = new Uint8Array(buffer) | ||
| let padding = alphabet.indexOf('=') === alphabet.length - 1 | ||
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| if (padding) { | ||
| alphabet = alphabet.substring(0, alphabet.length - 2) | ||
| } | ||
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| let bits = 0 | ||
| let value = 0 | ||
| let output = '' | ||
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| for (let i = 0; i < length; i++) { | ||
| value = (value << 8) | view[i] | ||
| bits += 8 | ||
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| while (bits >= 5) { | ||
| output += alphabet[(value >>> (bits - 5)) & 31] | ||
| bits -= 5 | ||
| } | ||
| } | ||
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| if (bits > 0) { | ||
| output += alphabet[(value << (5 - bits)) & 31] | ||
| } | ||
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| if (padding) { | ||
| while ((output.length % 8) !== 0) { | ||
| output += '=' | ||
| } | ||
| } | ||
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| return output | ||
| } | ||
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| module.exports = function base32 (alphabet) { | ||
| return { | ||
| encode (input) { | ||
| if (typeof input === 'string') { | ||
| return encode(new Buffer(input), alphabet) | ||
| } | ||
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| return encode(input, alphabet) | ||
| }, | ||
| decode (input) { | ||
| for (let char of input) { | ||
| if (alphabet.indexOf(char) < 0) { | ||
| throw new Error('invalid base32 character') | ||
| } | ||
| } | ||
|
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| return decode(input, alphabet) | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| 'use strict' | ||
|
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| module.exports = function base64 (alphabet) { | ||
| // The alphabet is only used to know: | ||
| // 1. If padding is enabled (must contain '=') | ||
| // 2. If the output must be url-safe (must contain '-' and '_') | ||
| // 3. If the input of the output function is valid | ||
| // The alphabets from RFC 4648 are always used. | ||
| const padding = alphabet.indexOf('=') > -1 | ||
| const url = alphabet.indexOf('-') > -1 && alphabet.indexOf('_') > -1 | ||
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| return { | ||
| encode (input) { | ||
| let output = '' | ||
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| if (typeof input === 'string') { | ||
| output = new Buffer(input).toString('base64') | ||
| } else { | ||
| output = input.toString('base64') | ||
| } | ||
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| if (url) { | ||
| output = output.replace('+', '-') | ||
| output = output.replace('/', '_') | ||
| } | ||
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| const pad = output.indexOf('=') | ||
| if (pad > 0 && !padding) { | ||
| output = output.substring(0, pad) | ||
| } | ||
|
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| return output | ||
| }, | ||
| decode (input) { | ||
| if (url) { | ||
| input = input.replace('+', '-') | ||
| input = input.replace('/', '_') | ||
| } | ||
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| for (let char of input) { | ||
| if (alphabet.indexOf(char) < 0) { | ||
| throw new Error('invalid base64 character') | ||
| } | ||
| } | ||
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| return new Buffer(input, 'base64') | ||
| } | ||
| } | ||
| } |
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