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b37180fcf2
Bug: webrtc:11933,webrtc:8982 Change-Id: I8008eb704549e690d7c778f743a5b9cd0c52892c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/208941 Commit-Queue: Björn Terelius <terelius@webrtc.org> Reviewed-by: Elad Alon <eladalon@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33603}
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "logging/rtc_event_log/encoder/blob_encoding.h"
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#include <cstdint>
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#include "logging/rtc_event_log/encoder/var_int.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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std::string EncodeBlobs(const std::vector<std::string>& blobs) {
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RTC_DCHECK(!blobs.empty());
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size_t result_length_bound = kMaxVarIntLengthBytes * blobs.size();
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for (const auto& blob : blobs) {
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// Providing an input so long that it would cause a wrap-around is an error.
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RTC_DCHECK_GE(result_length_bound + blob.length(), result_length_bound);
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result_length_bound += blob.length();
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}
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std::string result;
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result.reserve(result_length_bound);
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// First, encode all of the lengths.
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for (absl::string_view blob : blobs) {
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result += EncodeVarInt(blob.length());
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}
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// Second, encode the actual blobs.
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for (absl::string_view blob : blobs) {
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result.append(blob.data(), blob.length());
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}
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RTC_DCHECK_LE(result.size(), result_length_bound);
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return result;
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}
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std::vector<absl::string_view> DecodeBlobs(absl::string_view encoded_blobs,
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size_t num_of_blobs) {
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if (encoded_blobs.empty()) {
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RTC_LOG(LS_WARNING) << "Corrupt input; empty input.";
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return std::vector<absl::string_view>();
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}
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if (num_of_blobs == 0u) {
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RTC_LOG(LS_WARNING)
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<< "Corrupt input; number of blobs must be greater than 0.";
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return std::vector<absl::string_view>();
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}
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// Read the lengths of all blobs.
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std::vector<uint64_t> lengths(num_of_blobs);
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for (size_t i = 0; i < num_of_blobs; ++i) {
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bool success = false;
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std::tie(success, encoded_blobs) = DecodeVarInt(encoded_blobs, &lengths[i]);
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if (!success) {
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RTC_LOG(LS_WARNING) << "Corrupt input; varint decoding failed.";
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return std::vector<absl::string_view>();
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}
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}
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// Read the blobs themselves.
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std::vector<absl::string_view> blobs(num_of_blobs);
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for (size_t i = 0; i < num_of_blobs; ++i) {
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if (lengths[i] > encoded_blobs.length()) {
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RTC_LOG(LS_WARNING) << "Corrupt input; blob sizes exceed input size.";
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return std::vector<absl::string_view>();
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}
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blobs[i] = encoded_blobs.substr(0, lengths[i]);
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encoded_blobs = encoded_blobs.substr(lengths[i]);
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}
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if (!encoded_blobs.empty()) {
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RTC_LOG(LS_WARNING) << "Corrupt input; unrecognized trailer.";
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return std::vector<absl::string_view>();
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}
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return blobs;
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}
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} // namespace webrtc
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