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