| //===--- Base64.h - Base64 Encoder/Decoder ----------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file provides generic base64 encoder/decoder. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_SUPPORT_BASE64_H |
| #define LLVM_SUPPORT_BASE64_H |
| |
| #include <string> |
| |
| namespace llvm { |
| |
| template <class InputBytes> std::string encodeBase64(InputBytes const &Bytes) { |
| static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| "abcdefghijklmnopqrstuvwxyz" |
| "0123456789+/"; |
| std::string Buffer; |
| Buffer.resize(((Bytes.size() + 2) / 3) * 4); |
| |
| size_t i = 0, j = 0; |
| for (size_t n = Bytes.size() / 3 * 3; i < n; i += 3, j += 4) { |
| uint32_t x = ((unsigned char)Bytes[i] << 16) | |
| ((unsigned char)Bytes[i + 1] << 8) | |
| (unsigned char)Bytes[i + 2]; |
| Buffer[j + 0] = Table[(x >> 18) & 63]; |
| Buffer[j + 1] = Table[(x >> 12) & 63]; |
| Buffer[j + 2] = Table[(x >> 6) & 63]; |
| Buffer[j + 3] = Table[x & 63]; |
| } |
| if (i + 1 == Bytes.size()) { |
| uint32_t x = ((unsigned char)Bytes[i] << 16); |
| Buffer[j + 0] = Table[(x >> 18) & 63]; |
| Buffer[j + 1] = Table[(x >> 12) & 63]; |
| Buffer[j + 2] = '='; |
| Buffer[j + 3] = '='; |
| } else if (i + 2 == Bytes.size()) { |
| uint32_t x = |
| ((unsigned char)Bytes[i] << 16) | ((unsigned char)Bytes[i + 1] << 8); |
| Buffer[j + 0] = Table[(x >> 18) & 63]; |
| Buffer[j + 1] = Table[(x >> 12) & 63]; |
| Buffer[j + 2] = Table[(x >> 6) & 63]; |
| Buffer[j + 3] = '='; |
| } |
| return Buffer; |
| } |
| |
| } // end namespace llvm |
| |
| #endif |