| // Copyright 2021 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "quiche/common/quiche_text_utils.h" |
| |
| #include <algorithm> |
| #include <optional> |
| #include <string> |
| |
| #include "absl/strings/escaping.h" |
| #include "absl/strings/str_cat.h" |
| #include "absl/strings/str_format.h" |
| |
| namespace quiche { |
| |
| // static |
| void QuicheTextUtils::Base64Encode(const uint8_t* data, size_t data_len, |
| std::string* output) { |
| absl::Base64Escape(std::string(reinterpret_cast<const char*>(data), data_len), |
| output); |
| // Remove padding. |
| size_t len = output->size(); |
| if (len >= 2) { |
| if ((*output)[len - 1] == '=') { |
| len--; |
| if ((*output)[len - 1] == '=') { |
| len--; |
| } |
| output->resize(len); |
| } |
| } |
| } |
| |
| // static |
| std::optional<std::string> QuicheTextUtils::Base64Decode( |
| absl::string_view input) { |
| std::string output; |
| if (!absl::Base64Unescape(input, &output)) { |
| return std::nullopt; |
| } |
| return output; |
| } |
| |
| // static |
| std::string QuicheTextUtils::HexDump(absl::string_view binary_data) { |
| const int kBytesPerLine = 16; // Maximum bytes dumped per line. |
| int offset = 0; |
| const char* p = binary_data.data(); |
| int bytes_remaining = binary_data.size(); |
| std::string output; |
| while (bytes_remaining > 0) { |
| const int line_bytes = std::min(bytes_remaining, kBytesPerLine); |
| absl::StrAppendFormat(&output, "0x%04x: ", offset); |
| for (int i = 0; i < kBytesPerLine; ++i) { |
| if (i < line_bytes) { |
| absl::StrAppendFormat(&output, "%02x", |
| static_cast<unsigned char>(p[i])); |
| } else { |
| absl::StrAppend(&output, " "); |
| } |
| if (i % 2) { |
| absl::StrAppend(&output, " "); |
| } |
| } |
| absl::StrAppend(&output, " "); |
| for (int i = 0; i < line_bytes; ++i) { |
| // Replace non-printable characters and 0x20 (space) with '.' |
| output += absl::ascii_isgraph(p[i]) ? p[i] : '.'; |
| } |
| |
| bytes_remaining -= line_bytes; |
| offset += line_bytes; |
| p += line_bytes; |
| absl::StrAppend(&output, "\n"); |
| } |
| return output; |
| } |
| |
| } // namespace quiche |