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// 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/virtual_block_parser.h"
#include <cassert>
#include <cstdint>
#include "webm/element.h"
namespace webm {
Status VirtualBlockParser::Init(const ElementMetadata& metadata,
std::uint64_t max_size) {
assert(metadata.size == kUnknownElementSize || metadata.size <= max_size);
if (metadata.size == kUnknownElementSize || metadata.size < 4) {
return Status(Status::kInvalidElementSize);
}
*this = {};
my_size_ = metadata.size;
return Status(Status::kOkCompleted);
}
Status VirtualBlockParser::Feed(Callback* callback, Reader* reader,
std::uint64_t* num_bytes_read) {
assert(callback != nullptr);
assert(reader != nullptr);
assert(num_bytes_read != nullptr);
*num_bytes_read = 0;
Status status;
std::uint64_t local_num_bytes_read;
while (true) {
switch (state_) {
case State::kReadingHeader: {
status = parser_.Feed(callback, reader, &local_num_bytes_read);
*num_bytes_read += local_num_bytes_read;
total_bytes_read_ += local_num_bytes_read;
if (!status.completed_ok()) {
return status;
}
value_.track_number = parser_.value().track_number;
value_.timecode = parser_.value().timecode;
state_ = State::kValidatingSize;
continue;
}
case State::kValidatingSize: {
if (my_size_ < total_bytes_read_) {
return Status(Status::kInvalidElementValue);
}
state_ = State::kDone;
continue;
}
case State::kDone: {
return Status(Status::kOkCompleted);
}
}
}
}
} // namespace webm
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