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demofile.h
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120 lines (107 loc) · 4.39 KB
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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
/**
* @brief Defines the Spring demofile format
*
* This file defines the Spring demofile format and which parts of it are
* supposed to be stable (can be used safely by 3rd party applications) or
* unstable (format may change every Spring release without notice).
*/
#ifndef DEMO_FILE_H
#define DEMO_FILE_H
#include "System/Platform/byteorder.h"
#include <cinttypes>
/** The first 16 bytes of each demofile. */
#define DEMOFILE_MAGIC "spring demofile"
/**
* The current demofile version. Only change on major modifications for which
* appending stuff to DemoFileHeader is not sufficient.
*/
#define DEMOFILE_VERSION 5
#pragma pack(push, 1)
/**
* @brief Spring demo file main header
*
* Demo file layout is like this:
*
* - DemoFileHeader
* - Data chunks:
* - Startscript (scriptSize)
* - Demo stream (demoStreamSize)
* - Player statistics, one PlayerStatistic for each player
* - Team statistics, consisting of:
* - Array of numTeams dwords indicating the number of
* CTeam::Statistics for each team.
* - Array of all CTeam::Statistics (total number of items is the
* sum of the elements in the array of dwords).
*
* The header is designed to be extensible: it contains a version field and a
* headerSize field to support this. The version field is a major version number
* of the file format, if this changes, anything may have changed in the file.
* It is not supposed to change often (if at all). The headerSize field is a
* minor version number, which happens to be equal to sizeof(DemoFileHeader).
*
* If Spring did not cleanup properly (crashed), the demoStreamSize is 0 and it
* can be assumed the demo stream continues until the end of the file.
*/
struct DemoFileHeader
{
char magic[16]; ///< DEMOFILE_MAGIC
int version; ///< DEMOFILE_VERSION
int headerSize; ///< Size of the DemoFileHeader, minor version number.
char versionString[256]; ///< Spring version string, e.g. "0.75b2", "0.75b2+svn4123"
std::uint8_t gameID[16]; ///< Unique game identifier. Identical for each player of the game.
std::uint64_t unixTime; ///< Unix time when game was started.
int scriptSize; ///< Size of startscript.
int demoStreamSize; ///< Size of the demo stream.
int gameTime; ///< Total number of seconds game time.
int wallclockTime; ///< Total number of seconds wallclock time.
int numPlayers; ///< Number of players for which stats are saved. (this contains also later joined spectators!)
int playerStatSize; ///< Size of the entire player statistics chunk.
int playerStatElemSize; ///< sizeof(CPlayer::Statistics)
int numTeams; ///< Number of teams for which stats are saved.
int teamStatSize; ///< Size of the entire team statistics chunk.
int teamStatElemSize; ///< sizeof(CTeam::Statistics)
int teamStatPeriod; ///< Interval (in seconds) between team stats.
int winningAllyTeamsSize; ///< The size of the vector of the winning ally teams
/// Change structure from host endian to little endian or vice versa.
void swab() {
swabDWordInPlace(version);
swabDWordInPlace(headerSize);
// FIXME endian: unixTime = swabQWordInPlace(unixTime);
swabDWordInPlace(scriptSize);
swabDWordInPlace(demoStreamSize);
swabDWordInPlace(gameTime);
swabDWordInPlace(wallclockTime);
swabDWordInPlace(numPlayers);
swabDWordInPlace(playerStatSize);
swabDWordInPlace(playerStatElemSize);
swabDWordInPlace(numTeams);
swabDWordInPlace(teamStatSize);
swabDWordInPlace(teamStatElemSize);
swabDWordInPlace(teamStatPeriod);
swabDWordInPlace(winningAllyTeamsSize);
}
};
/**
* @brief Spring demo stream chunk header
*
* The demo stream layout is as follows:
*
* - DemoStreamChunkHeader
* - length bytes raw data from network stream
* - DemoStreamChunkHeader
* - length bytes raw data from network stream
* - ...
*/
struct DemoStreamChunkHeader
{
float modGameTime; ///< Gametime at which this chunk was written/should be read.
std::uint32_t length; ///< Length of the chunk of data following this header.
/// Change structure from host endian to little endian or vice versa.
void swab() {
swabFloatInPlace(modGameTime);
swabDWordInPlace(length);
}
};
#pragma pack(pop)
#endif // DEMO_FILE_H