Initial release

thirdparty/libwebm/webm_parser/src/id_element_parser.cc

@@ -0,0 +1,49 @@
+// 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