| // Copyright (c) 2016 The WebM project authors. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the LICENSE file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| #include "src/id_element_parser.h" |
| |
| #include <cassert> |
| #include <cstdint> |
| |
| #include "src/element_parser.h" |
| #include "src/parser_utils.h" |
| #include "webm/callback.h" |
| #include "webm/element.h" |
| #include "webm/reader.h" |
| #include "webm/status.h" |
| |
| namespace webm { |
| |
| Status IdElementParser::Init(const ElementMetadata& metadata, |
| std::uint64_t max_size) { |
| assert(metadata.size == kUnknownElementSize || metadata.size <= max_size); |
| |
| if (metadata.size == 0 || metadata.size > 4) { |
| return Status(Status::kInvalidElementSize); |
| } |
| |
| num_bytes_remaining_ = static_cast<int>(metadata.size); |
| value_ = static_cast<Id>(0); |
| |
| return Status(Status::kOkCompleted); |
| } |
| |
| Status IdElementParser::Feed(Callback* callback, Reader* reader, |
| std::uint64_t* num_bytes_read) { |
| assert(callback != nullptr); |
| assert(reader != nullptr); |
| assert(num_bytes_read != nullptr); |
| |
| const Status status = AccumulateIntegerBytes(num_bytes_remaining_, reader, |
| &value_, num_bytes_read); |
| num_bytes_remaining_ -= static_cast<int>(*num_bytes_read); |
| |
| return status; |
| } |
| |
| } // namespace webm |