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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===--- Base64.h - Base64 Encoder/Decoder ----------------------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file provides generic base64 encoder/decoder. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_SUPPORT_BASE64_H |
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| 14 | #define LLVM_SUPPORT_BASE64_H |
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| 15 | |||
| 16 | #include "llvm/Support/Error.h" |
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| 17 | #include <cstdint> |
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| 18 | #include <string> |
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| 19 | #include <vector> |
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| 20 | |||
| 21 | namespace llvm { |
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| 22 | |||
| 23 | template <class InputBytes> std::string encodeBase64(InputBytes const &Bytes) { |
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| 24 | static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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| 25 | "abcdefghijklmnopqrstuvwxyz" |
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| 26 | "0123456789+/"; |
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| 27 | std::string Buffer; |
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| 28 | Buffer.resize(((Bytes.size() + 2) / 3) * 4); |
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| 29 | |||
| 30 | size_t i = 0, j = 0; |
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| 31 | for (size_t n = Bytes.size() / 3 * 3; i < n; i += 3, j += 4) { |
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| 32 | uint32_t x = ((unsigned char)Bytes[i] << 16) | |
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| 33 | ((unsigned char)Bytes[i + 1] << 8) | |
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| 34 | (unsigned char)Bytes[i + 2]; |
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| 35 | Buffer[j + 0] = Table[(x >> 18) & 63]; |
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| 36 | Buffer[j + 1] = Table[(x >> 12) & 63]; |
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| 37 | Buffer[j + 2] = Table[(x >> 6) & 63]; |
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| 38 | Buffer[j + 3] = Table[x & 63]; |
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| 39 | } |
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| 40 | if (i + 1 == Bytes.size()) { |
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| 41 | uint32_t x = ((unsigned char)Bytes[i] << 16); |
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| 42 | Buffer[j + 0] = Table[(x >> 18) & 63]; |
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| 43 | Buffer[j + 1] = Table[(x >> 12) & 63]; |
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| 44 | Buffer[j + 2] = '='; |
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| 45 | Buffer[j + 3] = '='; |
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| 46 | } else if (i + 2 == Bytes.size()) { |
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| 47 | uint32_t x = |
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| 48 | ((unsigned char)Bytes[i] << 16) | ((unsigned char)Bytes[i + 1] << 8); |
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| 49 | Buffer[j + 0] = Table[(x >> 18) & 63]; |
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| 50 | Buffer[j + 1] = Table[(x >> 12) & 63]; |
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| 51 | Buffer[j + 2] = Table[(x >> 6) & 63]; |
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| 52 | Buffer[j + 3] = '='; |
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| 53 | } |
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| 54 | return Buffer; |
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| 55 | } |
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| 56 | |||
| 57 | llvm::Error decodeBase64(llvm::StringRef Input, std::vector<char> &Output); |
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| 58 | |||
| 59 | } // end namespace llvm |
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| 60 | |||
| 61 | #endif |