CSC

Header

The header consists of an 8 byte magic number (see below), followed by a 1-byte major version number and 1-byte minor version number.

Changes in minor numbers should not cause problems for parsers. It indicates a change in chunk types (different contents), but the file format is the same.

The major number is reserved for any incompatible file format changes (which hopefully should be never).

/* The header */
typedef struct {
    unsigned char  magic[8];	  /* 0xae5a54520d0a1a0a (be) */
    unsigned char  version_major; /* 1 */
    unsigned char  version_minor; /* 2 */
} ztr_header_t;

/* The ZTR magic numbers */
#define ZTR_MAGIC		"\256ZTR\r\n\032\n"
#define ZTR_VERSION_MAJOR	1
#define ZTR_VERSION_MINOR	2

So the total header will consist of:

Byte number   0  1  2  3  4  5  6  7  8  9
            +--+--+--+--+--+--+--+--+--+--+
Hex values  |ae 5a 54 52 0d 0a 1a 0d|01 02|
            +--+--+--+--+--+--+--+--+--+--+