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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "DemoReader.h"
#include "Game/GameVersion.h"
#include "Sim/Misc/GlobalConstants.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 <array>
#include <climits>
#include <stdexcept>
#include <cassert>
#include <cstring>
static bool CheckDemoHeader(const DemoFileHeader& fileHeader)
{
if (memcmp(fileHeader.magic, DEMOFILE_MAGIC, sizeof(fileHeader.magic)) != 0)
return false;
if (fileHeader.version != DEMOFILE_VERSION)
return false;
if (fileHeader.headerSize != sizeof(DemoFileHeader))
return false;
if (fileHeader.playerStatElemSize != sizeof(PlayerStatistics))
return false;
if (fileHeader.teamStatElemSize != sizeof(TeamStatistics))
return false;
// do not compare Spring version in debug mode: we do not want to make
// debugging dev-version demos impossible (because the version differs
// each build)
#ifndef _DEBUG
return (!SpringVersion::IsRelease() || strcmp(fileHeader.versionString, SpringVersion::GetSync().c_str()) == 0);
#endif
return true;
}
CDemoReader::CDemoReader(const std::string& filename, float curTime): playbackDemo(new CGZFileHandler(filename, SPRING_VFS_PWD_ALL))
{
if (FileSystem::GetExtension(filename) != "sdfz")
throw content_error("Unknown demo extension: " + FileSystem::GetExtension(filename));
// file not found -> exception
if (!playbackDemo->FileExists())
throw user_error("Demofile not found: " + filename);
playbackDemo->Read((char*)&fileHeader, sizeof(fileHeader));
fileHeader.swab();
if (!CheckDemoHeader(fileHeader)) {
char buf[1024];
const char* fmt = "[%s] demo-file \"%s\" (%d bytes, magic \"%s\") corrupt or created by a different Spring version, expected \"%s\"";
memset(buf, 0, sizeof(buf));
snprintf(buf, sizeof(buf) - 1, fmt, __func__, filename.c_str(), playbackDemo->FileSize(), fileHeader.magic, fileHeader.versionString);
#ifndef TOOLS
if (!configHandler->GetBool("DisableDemoVersionCheck"))
throw std::runtime_error(buf);
#endif
LOG_L(L_WARNING, "%s", buf);
}
if (fileHeader.scriptSize != 0) {
setupScript.resize(fileHeader.scriptSize, 0);
playbackDemo->Read(const_cast<char*>(setupScript.data()), setupScript.size());
}
playbackDemo->Read((char*)&chunkHeader, sizeof(chunkHeader));
chunkHeader.swab();
demoTimeOffset = curTime - chunkHeader.modGameTime - 0.1f;
nextDemoReadTime = curTime - 0.01f;
const 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::array<int, MAX_TEAMS> numStatsPerTeam;
assert(fileHeader.numTeams <= numStatsPerTeam.size());
numStatsPerTeam.fill(0);
playbackDemo->Read(reinterpret_cast<char*>(numStatsPerTeam.data()), fileHeader.numTeams);
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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