| 0 |
4 |
Length of the file header. The first 4 bits are always set to 3 (0011 in binary) indicating that this is a system record. The remaining bits contain the length of the file header record. If the maximum record length is less than 4095 bytes, the length is 126 and is held in the next 12 bits; otherwise it is 124 and is held in the next 28 bits. Hence, in a file where the maximum record length is less than 4095 bytes, this field contains x"30 7E 00 00". Otherwise, this field contains x"30 00 00 7C". An exception to this is the header of C-ISAM files, for which the field contains "30 00 03 FC".
|
| 4 |
2 |
Database sequence number, used by add-on products. |
| 6 |
2 |
Integrity flag. Indexed files only. If this is non-zero when the header is read, it indicates that the file is corrupt. |
| 8 |
14 |
Creation date and time in YYMMDDHHMMSSCC format. Indexed files only. |
| 22 |
14 |
Reserved. |
| 36 |
2 |
Reserved. Value 62 decimal; x"00 3E". |
| 38 |
1 |
Not used. Set to zeros. |
| 39 |
1 |
Organization:
- Sequential
- Indexed
- Relative
|
| 40 |
1 |
Not used. Set to zeros. |
| 41 |
1 |
Data compression routine number:
- 0
- No compression
- 1
- CBLDC001
- 2-127
- Reserved for internal use
- 128-255
- User-defined compression routine number
|
| 42 |
1 |
Not used. Set to zeros. |
| 43 |
1 |
Indexed files only - type of indexed file. |
| 44 |
4 |
Reserved. |
| 48 |
1 |
Recording mode:
- 0
- Fixed format
- 1
- Variable format
For indexed files, the recording mode field of the .idx file takes precedence.
|
| 49 |
5 |
Not used. Set to zeros. |
| 54 |
4 |
Maximum record length. Example: with a maximum record of length 80 characters, this field will contain x"00 00 00 50". |
| 58 |
4 |
Minimum record length. Example: with a minimum record length of 2 characters, this field will contain x"00 00 00 02". |
| 62 |
46 |
Not used. Set to zeros. |
| 108 |
4 |
Version and build data for the indexed file handler creating the file. Indexed files only. |
| 112 |
16 |
Not used. Set to zeros. |
