Utils.cpp

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//===- Utils.cpp - implementations ESI utility code -----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// DO NOT EDIT!
// This file is distributed as part of an ESI package. The source for this file
// should always be modified within CIRCT
// (lib/dialect/ESI/runtime/cpp/lib/backends/Cosim.cpp).
//
//===----------------------------------------------------------------------===//
 
#include "esi/Utils.h"
 
static constexpr char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                                "abcdefghijklmnopqrstuvwxyz"
                                "0123456789+/";
 
// Copied then modified slightly from llvm/lib/Support/Base64.cpp.
void esi::utils::encodeBase64(const void *dataIn, size_t size,
                              std::string &buffer) {
  const char *data = static_cast<const char *>(dataIn);
  buffer.resize(((size + 2) / 3) * 4);
 
  size_t i = 0, j = 0;
  for (size_t n = size / 3 * 3; i < n; i += 3, j += 4) {
    uint32_t x = ((unsigned char)data[i] << 16) |
                 ((unsigned char)data[i + 1] << 8) | (unsigned char)data[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 == size) {
    uint32_t x = ((unsigned char)data[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 == size) {
    uint32_t x =
        ((unsigned char)data[i] << 16) | ((unsigned char)data[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] = '=';
  }
}