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Merge pull request #979 from hgtw/fix/zlib-deflate-size

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Send packet uncompressed if zlib deflates to a larger size than input
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Chris Miles 2020-02-22 16:24:27 -06:00 committed by GitHub
commit 8787f51b58
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1 changed files with 4 additions and 2 deletions
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6
common/net/daybreak_connection.cpp
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@ -1047,12 +1047,14 @@ void EQ::Net::DaybreakConnection::Compress(Packet &p, size_t offset, size_t leng
uint8_t new_buffer[2048] = { 0 }; uint8_t new_buffer[2048] = { 0 };
uint8_t *buffer = (uint8_t*)p.Data() + offset; uint8_t *buffer = (uint8_t*)p.Data() + offset;
uint32_t new_length = 0; uint32_t new_length = 0;
bool send_uncompressed = true;
if (length > 30) { if (length > 30) {
new_length = Deflate(buffer, (uint32_t)length, new_buffer + 1, 2048) + 1; new_length = Deflate(buffer, (uint32_t)length, new_buffer + 1, 2048) + 1;
new_buffer[0] = 0x5a; new_buffer[0] = 0x5a;
send_uncompressed = (new_length > length);
} }
else { if (send_uncompressed) {
memcpy(new_buffer + 1, buffer, length); memcpy(new_buffer + 1, buffer, length);
new_buffer[0] = 0xa5; new_buffer[0] = 0xa5;
new_length = length + 1; new_length = length + 1;
@ -1380,7 +1382,7 @@ void EQ::Net::DaybreakConnection::InternalQueuePacket(Packet &p, int stream_id,
} }
auto stream = &m_streams[stream_id]; auto stream = &m_streams[stream_id];
auto max_raw_size = m_max_packet_size - m_crc_bytes - DaybreakReliableHeader::size(); auto max_raw_size = m_max_packet_size - m_crc_bytes - DaybreakReliableHeader::size() - 1; // -1 for compress flag
size_t length = p.Length(); size_t length = p.Length();
if (length > max_raw_size) { if (length > max_raw_size) {
DaybreakReliableFragmentHeader first_header; DaybreakReliableFragmentHeader first_header;