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67 lines
2.7 KiB
V
67 lines
2.7 KiB
V
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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// Based off: https://github.com/golang/go/blob/master/src/encoding/base64/base64.go
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// Last commit: https://github.com/golang/go/commit/9a93baf4d7d13d7d5c67388c93960d78abc8e11e
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module base64
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const (
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index = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 63, 62, 62, 63, 52, 53, 54, 55,
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56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
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13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 63, 0, 26, 27, 28, 29,
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30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51]!
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ending_table = [0, 2, 1]!
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enc_table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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)
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// url_decode returns a decoded URL `string` version of
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// the a base64 url encoded `string` passed in `data`.
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pub fn url_decode(data string) []byte {
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mut result := data.replace_each(['-', '+', '_', '/'])
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match result.len % 4 {
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// Pad with trailing '='s
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2 { result += '==' } // 2 pad chars
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3 { result += '=' } // 1 pad char
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else {} // no padding
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}
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return decode(result)
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}
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// url_decode_str is the string variant of url_decode
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pub fn url_decode_str(data string) string {
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mut result := data.replace_each(['-', '+', '_', '/'])
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match result.len % 4 {
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// Pad with trailing '='s
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2 { result += '==' } // 2 pad chars
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3 { result += '=' } // 1 pad char
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else {} // no padding
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}
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return decode_str(result)
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}
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// url_encode returns a base64 URL encoded `string` version
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// of the value passed in `data`.
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pub fn url_encode(data []byte) string {
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return encode(data).replace_each(['+', '-', '/', '_', '=', ''])
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}
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// url_encode_str is the string variant of url_encode
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pub fn url_encode_str(data string) string {
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return encode_str(data).replace_each(['+', '-', '/', '_', '=', ''])
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}
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// assemble64 assembles 8 base64 digits into 6 bytes.
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// Each digit comes from the decode map.
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// Please note: Invalid base64 digits are not expected and not handled.
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fn assemble64(n1 byte, n2 byte, n3 byte, n4 byte, n5 byte, n6 byte, n7 byte, n8 byte) u64 {
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return u64(n1) << 58 | u64(n2) << 52 | u64(n3) << 46 | u64(n4) << 40 | u64(n5) << 34 | u64(n6) << 28 | u64(n7) << 22 | u64(n8) << 16
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}
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// assemble32 assembles 4 base64 digits into 3 bytes.
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// Each digit comes from the decode map.
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// Please note: Invalid base64 digits are not expected and not handled.
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fn assemble32(n1 byte, n2 byte, n3 byte, n4 byte) u32 {
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return u32(n1) << 26 | u32(n2) << 20 | u32(n3) << 14 | u32(n4) << 8
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}
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