/usr/include/rosbag/constants.h is in librosbag-storage-dev 1.11.16-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ifndef ROSBAG_CONSTANTS_H
#define ROSBAG_CONSTANTS_H
#include <string>
#include <stdint.h>
namespace rosbag {
// Bag file version to write
static const std::string VERSION = "2.0";
// Header field delimiter
static const unsigned char FIELD_DELIM = '=';
// Current header fields
static const std::string OP_FIELD_NAME = "op";
static const std::string TOPIC_FIELD_NAME = "topic";
static const std::string VER_FIELD_NAME = "ver";
static const std::string COUNT_FIELD_NAME = "count";
static const std::string INDEX_POS_FIELD_NAME = "index_pos"; // 1.2+
static const std::string CONNECTION_COUNT_FIELD_NAME = "conn_count"; // 2.0+
static const std::string CHUNK_COUNT_FIELD_NAME = "chunk_count"; // 2.0+
static const std::string CONNECTION_FIELD_NAME = "conn"; // 2.0+
static const std::string COMPRESSION_FIELD_NAME = "compression"; // 2.0+
static const std::string SIZE_FIELD_NAME = "size"; // 2.0+
static const std::string TIME_FIELD_NAME = "time"; // 2.0+
static const std::string START_TIME_FIELD_NAME = "start_time"; // 2.0+
static const std::string END_TIME_FIELD_NAME = "end_time"; // 2.0+
static const std::string CHUNK_POS_FIELD_NAME = "chunk_pos"; // 2.0+
// Legacy header fields
static const std::string MD5_FIELD_NAME = "md5"; // <2.0
static const std::string TYPE_FIELD_NAME = "type"; // <2.0
static const std::string DEF_FIELD_NAME = "def"; // <2.0
static const std::string SEC_FIELD_NAME = "sec"; // <2.0
static const std::string NSEC_FIELD_NAME = "nsec"; // <2.0
static const std::string LATCHING_FIELD_NAME = "latching"; // <2.0
static const std::string CALLERID_FIELD_NAME = "callerid"; // <2.0
// Current "op" field values
static const unsigned char OP_MSG_DATA = 0x02;
static const unsigned char OP_FILE_HEADER = 0x03;
static const unsigned char OP_INDEX_DATA = 0x04;
static const unsigned char OP_CHUNK = 0x05;
static const unsigned char OP_CHUNK_INFO = 0x06;
static const unsigned char OP_CONNECTION = 0x07;
// Legacy "op" field values
static const unsigned char OP_MSG_DEF = 0x01;
// Bytes reserved for file header record (4KB)
static const uint32_t FILE_HEADER_LENGTH = 4 * 1024;
// Index data record version to write
static const uint32_t INDEX_VERSION = 1;
// Chunk info record version to write
static const uint32_t CHUNK_INFO_VERSION = 1;
// Compression types
static const std::string COMPRESSION_NONE = "none";
static const std::string COMPRESSION_BZ2 = "bz2";
static const std::string COMPRESSION_LZ4 = "lz4";
} // namespace rosbag
#endif
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