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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "DemoReader.h"
#include "System/mmgr.h"
#include "System/Exceptions.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.open(filename.c_str(), std::ios::binary);
if (!playbackDemo.is_open()) {
// 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
) {
throw std::runtime_error(std::string("Demofile corrupt or created by a different version of Spring: ")+filename);
}
if (fileHeader.scriptSize != 0) {
char* buf = new char[fileHeader.scriptSize];
playbackDemo.read(buf, fileHeader.scriptSize);
setupScript = std::string(buf, fileHeader.scriptSize);
delete[] buf;
}
playbackDemo.read((char*)&chunkHeader, sizeof(chunkHeader));
chunkHeader.swab();
demoTimeOffset = curTime - chunkHeader.modGameTime - 0.1f;
nextDemoReadTime = curTime - 0.01f;
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 ;-))
long curPos = playbackDemo.tellg();
playbackDemo.seekg(0, std::ios::end);
bytesRemaining = (long) playbackDemo.tellg() - curPos;
playbackDemo.seekg(curPos);
}
}
netcode::RawPacket* CDemoReader::GetData(float readTime)
{
if (ReachedEnd())
return NULL;
// 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);
playbackDemo.read((char*)(buf->data), chunkHeader.length);
bytesRemaining -= chunkHeader.length;
if (!ReachedEnd()) {
// read next chunk header
playbackDemo.read((char*)&chunkHeader, sizeof(chunkHeader));
chunkHeader.swab();
nextDemoReadTime = chunkHeader.modGameTime + demoTimeOffset;
bytesRemaining -= sizeof(chunkHeader);
}
return buf;
} else {
return NULL;
}
}
bool CDemoReader::ReachedEnd() const
{
if (bytesRemaining <= 0 || playbackDemo.eof())
return true;
else
return false;
}
void CDemoReader::LoadStats()
{
// Stats are not available if Spring crashed while writing the demo.
if (fileHeader.demoStreamSize == 0) {
return;
}
const int curPos = playbackDemo.tellg();
playbackDemo.seekg(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((char*) &buf, sizeof(buf));
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((char*) &buf, sizeof(buf));
buf.swab();
teamStats[teamNum].push_back(buf);
}
}
}
playbackDemo.seekg(curPos);
}
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