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707e3d187c
BitstreamReader allows to write easier to reader parser Bug: None Change-Id: I9da88c86ee04be4c0b06e181e409a915ba1a5123 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/231232 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/main@{#34939}
50 lines
1.8 KiB
C++
50 lines
1.8 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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#ifndef LOGGING_RTC_EVENT_LOG_ENCODER_VAR_INT_H_
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#define LOGGING_RTC_EVENT_LOG_ENCODER_VAR_INT_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string>
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#include <utility>
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#include "absl/strings/string_view.h"
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#include "rtc_base/bitstream_reader.h"
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namespace webrtc {
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extern const size_t kMaxVarIntLengthBytes;
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// Encode a given uint64_t as a varint. From least to most significant,
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// each batch of seven bits are put into the lower bits of a byte, and the last
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// remaining bit in that byte (the highest one) marks whether additional bytes
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// follow (which happens if and only if there are other bits in `input` which
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// are non-zero).
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// Notes: If input == 0, one byte is used. If input is uint64_t::max, exactly
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// kMaxVarIntLengthBytes are used.
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std::string EncodeVarInt(uint64_t input);
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// Inverse of EncodeVarInt().
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// Returns true and the remaining (unread) slice of the input if decoding
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// succeeds. Returns false otherwise and `output` is not modified.
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std::pair<bool, absl::string_view> DecodeVarInt(absl::string_view input,
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uint64_t* output);
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// Same as other version, but uses a BitstreamReader for input.
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// If decoding is successful returns the decoded varint.
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// If not successful, `input` reader is set into the failure state, return value
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// is unspecified.
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uint64_t DecodeVarInt(BitstreamReader& input);
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} // namespace webrtc
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#endif // LOGGING_RTC_EVENT_LOG_ENCODER_VAR_INT_H_
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