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Code Issues Releases Wiki Activity

Better encoding of stringtable updates

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This commit is contained in:
Robin Appelman 2017-11-20 23:23:24 +01:00
commit 3bf5111108
3 changed files with 19 additions and 11 deletions
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18
src/Parser/Packet/UpdateStringTable.ts
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@ -1,7 +1,7 @@
import {BitStream} from 'bit-buffer';
import {UpdateStringTablePacket} from '../../Data/Packet';
import {ParserState} from '../../Data/ParserState';
import {encodeStringTableEntries, guessStringTableEntryLength, parseStringTableEntries} from '../StringTableParser';
import {encodeStringTableEntries, parseStringTableEntries} from '../StringTableParser';
export function ParseUpdateStringTable(stream: BitStream, state: ParserState): UpdateStringTablePacket { // 12: updateStringTable
const tableId = stream.readBits(5);
@ -41,13 +41,17 @@ export function EncodeUpdateStringTable(packet: UpdateStringTablePacket, stream:
if (!state.stringTables[packet.tableId]) {
throw new Error(`Table not found for update: ${packet.tableId}`);
}
const lengthStart = stream.index;
stream.index += 20;
const lengthEnd = stream.index;
const table = state.stringTables[packet.tableId];
const entryData = new BitStream(new ArrayBuffer(guessStringTableEntryLength(table, packet.entries)));
encodeStringTableEntries(entryData, table, packet.entries);
const entryLength = entryData.index;
entryData.index = 0;
encodeStringTableEntries(stream, table, packet.entries, table.entries);
const dataEnd = stream.index;
stream.index = lengthStart;
const entryLength = dataEnd - lengthEnd;
stream.writeBits(entryLength, 20);
stream.writeBitStream(entryData, entryLength);
stream.index = dataEnd;
}