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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "DemoReader.h"
#ifndef TOOLS
#include "System/Config/ConfigHandler.h"
CONFIG(bool, DisableDemoVersionCheck).defaultValue(false).description("Allow to play every replay file (may crash / cause undefined behaviour in replays)");
#endif
#include "System/Exceptions.h"
#include "System/FileSystem/GZFileHandler.h"
#include "System/FileSystem/FileSystem.h"
#include "System/Log/ILog.h"
#include "System/Net/RawPacket.h"
#include "Game/GameVersion.h"
#include <limits.h>
#include <stdexcept>
#include <cassert>
#include <cstring>
CDemoReader::CDemoReader(const std::string& filename, float curTime): playbackDemo(new CGZFileHandler(filename, SPRING_VFS_PWD_ALL))
{
if (!playbackDemo->FileExists()) {
// file not found -> exception
throw user_error(std::string("Demofile not found: ") + filename);
}
playbackDemo->Read((char*)&fileHeader, sizeof(fileHeader));
fileHeader.swab();
if (memcmp(fileHeader.magic, DEMOFILE_MAGIC, sizeof(fileHeader.magic))
|| fileHeader.version != DEMOFILE_VERSION
|| fileHeader.headerSize != sizeof(fileHeader)
|| fileHeader.playerStatElemSize != sizeof(PlayerStatistics)
|| fileHeader.teamStatElemSize != sizeof(TeamStatistics)
// Don't compare spring version in debug mode: we don't want to make
// debugging dev-version demos impossible (because the version is different
// each build.)
#ifndef _DEBUG
|| (SpringVersion::IsRelease() && strcmp(fileHeader.versionString, SpringVersion::GetSync().c_str()))
#endif
) {
const std::string demoMsg = std::string("Demofile ") + filename + " corrupt or created by a different version of Spring, expects version " + fileHeader.versionString + ".";
#ifndef TOOLS
if (!configHandler->GetBool("DisableDemoVersionCheck"))
throw std::runtime_error(demoMsg);
#endif
LOG_L(L_WARNING, "%s", demoMsg.c_str());
}
if (fileHeader.scriptSize != 0) {
std::vector<char> buf(fileHeader.scriptSize);
playbackDemo->Read(&buf[0], fileHeader.scriptSize);
setupScript = std::string(&buf[0], fileHeader.scriptSize);
}
playbackDemo->Read((char*)&chunkHeader, sizeof(chunkHeader));
chunkHeader.swab();
demoTimeOffset = curTime - chunkHeader.modGameTime - 0.1f;
nextDemoReadTime = curTime - 0.01f;
long curPos = playbackDemo->GetPos();
playbackDemo->Seek(0, std::ios::end);
playbackDemoSize = playbackDemo->GetPos();
if (fileHeader.demoStreamSize != 0) {
bytesRemaining = fileHeader.demoStreamSize;
}
else {
// Spring crashed while recording the demo: replay until EOF,
// but at most filesize bytes to block watching demo of running game.
// For this we must determine the file size.
// (if this had still used CFileHandler that would have been easier ;-))
bytesRemaining = playbackDemoSize - curPos;
}
playbackDemo->Seek(curPos);
}
CDemoReader::~CDemoReader()
{
delete playbackDemo;
}
netcode::RawPacket* CDemoReader::GetData(const float readTime)
{
if (ReachedEnd())
return nullptr;
// when paused, modGameTime does not increase (ie. we
// always pass the same readTime value) so no seperate
// check needed
if (readTime >= nextDemoReadTime) {
netcode::RawPacket* buf = new netcode::RawPacket(chunkHeader.length);
if (playbackDemo->Read((char*)(buf->data), chunkHeader.length) < chunkHeader.length) {
delete buf;
bytesRemaining = 0;
return nullptr;
}
bytesRemaining -= chunkHeader.length;
if (!ReachedEnd()) {
// read next chunk header
if (playbackDemo->Read((char*)&chunkHeader, sizeof(chunkHeader)) < sizeof(chunkHeader)) {
delete buf;
bytesRemaining = 0;
return nullptr;
}
chunkHeader.swab();
nextDemoReadTime = chunkHeader.modGameTime + demoTimeOffset;
bytesRemaining -= sizeof(chunkHeader);
}
if (readTime < 0) {
delete buf;
return nullptr;
}
return buf;
}
return nullptr;
}
bool CDemoReader::ReachedEnd()
{
return (bytesRemaining <= 0 || playbackDemo->Eof() || (playbackDemo->GetPos() > playbackDemoSize));
}
void CDemoReader::LoadStats()
{
// Stats are not available if Spring crashed while writing the demo.
if (fileHeader.demoStreamSize == 0)
return;
const int curPos = playbackDemo->GetPos();
playbackDemo->Seek(fileHeader.headerSize + fileHeader.scriptSize + fileHeader.demoStreamSize);
winningAllyTeams.clear();
playerStats.clear();
teamStats.clear();
for (int allyTeamNum = 0; allyTeamNum < fileHeader.winningAllyTeamsSize; ++allyTeamNum) {
unsigned char winnerAllyTeam;
playbackDemo->Read((char*) &winnerAllyTeam, sizeof(unsigned char));
winningAllyTeams.push_back(winnerAllyTeam);
}
for (int playerNum = 0; playerNum < fileHeader.numPlayers; ++playerNum) {
PlayerStatistics buf;
playbackDemo->Read(reinterpret_cast<char*>(&buf), sizeof(PlayerStatistics));
buf.swab();
playerStats.push_back(buf);
}
{ // Team statistics follow player statistics.
teamStats.resize(fileHeader.numTeams);
// Read the array containing the number of team stats for each team.
std::vector<int> numStatsPerTeam(fileHeader.numTeams, 0);
playbackDemo->Read((char*) (&numStatsPerTeam[0]), numStatsPerTeam.size());
for (int teamNum = 0; teamNum < fileHeader.numTeams; ++teamNum) {
for (int i = 0; i < numStatsPerTeam[teamNum]; ++i) {
TeamStatistics buf;
playbackDemo->Read(reinterpret_cast<char*>(&buf), sizeof(TeamStatistics));
buf.swab();
teamStats[teamNum].push_back(buf);
}
}
}
playbackDemo->Seek(curPos);
}
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