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deserializeTransferrableObject.ts
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deserializeTransferrableObject.ts
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/**
* Copyright 2019 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import type { StringContext } from './strings';
import type { NodeContext } from './nodes';
import type { ObjectContext } from './object-context';
import { TransferrableObjectType } from '../transfer/TransferrableMutation';
interface DeserializedArgs {
args: unknown[];
offset: number;
}
const f32 = new Float32Array(1);
const u16 = new Uint16Array(f32.buffer);
/**
* Deserializes TransferrableObjectType arguments.
* @param buffer Contains mutation with arguments to deserialize.
* @param offset Start position of arguments in mutations buffer.
* @param count Number of arguments to deserialize.
* @param stringContext Strings context.
* @param nodeContext Nodes context.
* @param objectContext Objects context
*/
export function deserializeTransferrableObject(
buffer: Uint16Array,
offset: number,
count: number,
stringContext: StringContext,
nodeContext: NodeContext,
objectContext?: ObjectContext,
): DeserializedArgs {
const args: unknown[] = [];
for (let i = 0; i < count; i++) {
switch (buffer[offset++] as TransferrableObjectType) {
case TransferrableObjectType.SmallInt:
args.push(buffer[offset++]);
break;
case TransferrableObjectType.Float:
u16[0] = buffer[offset++];
u16[1] = buffer[offset++];
args.push(f32[0]);
break;
case TransferrableObjectType.String:
args.push(stringContext.get(buffer[offset++]));
break;
case TransferrableObjectType.Array:
const size = buffer[offset++];
const des = deserializeTransferrableObject(buffer, offset, size, stringContext, nodeContext, objectContext);
args.push(des.args);
offset = des.offset;
break;
case TransferrableObjectType.TransferObject:
if (!objectContext) {
throw new Error('objectContext not provided.');
}
args.push(objectContext.get(buffer[offset++]));
break;
case TransferrableObjectType.CanvasRenderingContext2D:
const canvas = nodeContext.getNode(buffer[offset++]) as HTMLCanvasElement;
args.push(canvas.getContext('2d'));
break;
case TransferrableObjectType.HTMLElement:
args.push(nodeContext.getNode(buffer[offset++]));
break;
default:
throw new Error('Cannot deserialize argument.');
}
}
return {
args,
offset,
};
}