Quantum Archive File Structure
File header
| Bytes | Description |
|---|---|
| 2 | Quantum signature: 0x44 0x53 |
| 1 | Quantum major version number |
| 1 | Quantum minor version number |
| 2 | number of files within this archive |
| 1 | table size required for decompression |
| 1 | compression flags |
This is immediately followed by the list of files:
| Bytes | Description |
|---|---|
| variable | length of file name, see (*) below |
| variable | file name, variable length string, not zero-terminated |
| variable | length of comment field, see (*) below |
| variable | comment field, variable length string, not zero-terminated |
| 4 | fully expanded file size in bytes |
| 2 | file time (DOS format) |
| 2 | file date (DOS format) |
Immediately following the list of files is the compressed data.
(*) Strings are prefixed with their length. If the length is less than 128 then it is stored directly in one byte. If it is greater than 127 then the high bit of the first byte is set to 1 and the remaining fifteen bits contain the actual length in big-endian format.
Read more about this topic: Quantum Compression
Famous quotes containing the words quantum, archive, file and/or structure:
“But how is one to make a scientist understand that there is something unalterably deranged about differential calculus, quantum theory, or the obscene and so inanely liturgical ordeals of the precession of the equinoxes.”
—Antonin Artaud (1896–1948)
“To a historian libraries are food, shelter, and even muse. They are of two kinds: the library of published material, books, pamphlets, periodicals, and the archive of unpublished papers and documents.”
—Barbara Tuchman (1912–1989)
“While waiting to get married, several forms of employment were acceptable. Teaching kindergarten was for those girls who stayed in school four years. The rest were secretaries, typists, file clerks, or receptionists in insurance firms or banks, preferably those owned or run by the family, but respectable enough if the boss was an upstanding Christian member of the community.”
—Barbara Howar (b. 1934)
“I’m a Sunday School teacher, and I’ve always known that the structure of law is founded on the Christian ethic that you shall love the Lord your God and your neighbor as yourself—a very high and perfect standard. We all know the fallibility of man, and the contentions in society, as described by Reinhold Niebuhr and many others, don’t permit us to achieve perfection.”
—Jimmy Carter (James Earl Carter, Jr.)