62 lines
1.7 KiB
JavaScript
62 lines
1.7 KiB
JavaScript
import Schema from './schema.js';
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export default class Serializer {
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constructor(schema) {
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this.schema = schema instanceof Schema ? schema : new Schema(schema);
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}
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decode(view, destination, offset = 0) {
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let cursor = offset;
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for (const [key, {type}] of this.schema) {
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const viewGetMethod = Schema.viewGetMethods[type];
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let value;
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if (viewGetMethod) {
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value = view[viewGetMethod](cursor, true);
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cursor += Schema.sizeOfType(type);
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}
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else {
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switch (type) {
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case 'string': {
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const length = view.getUint32(cursor, true);
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cursor += 4;
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const {buffer, byteOffset} = view;
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const decoder = new TextDecoder();
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value = decoder.decode(new DataView(buffer, byteOffset + cursor, length));
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cursor += length;
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break;
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}
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}
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}
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destination[key] = value;
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}
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}
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encode(source, view, offset = 0) {
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let cursor = offset;
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for (const [key, {type}] of this.schema) {
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const viewSetMethod = Schema.viewSetMethods[type];
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if (viewSetMethod) {
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view[viewSetMethod](cursor, source[key], true);
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cursor += Schema.sizeOfType(type);
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}
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else {
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switch (type) {
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case 'string': {
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const lengthOffset = cursor;
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cursor += 4;
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const encoder = new TextEncoder();
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const bytes = encoder.encode(source[key]);
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for (let i = 0; i < bytes.length; ++i) {
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view.setUint8(cursor++, bytes[i]);
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}
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view.setUint32(lengthOffset, bytes.length, true);
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break;
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}
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}
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}
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}
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}
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}
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