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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_200
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265_01
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formdraf.doc
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1990-02-15
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52 lines
chapters:
1. introduction
2. exchange media
3. archive format
4. implementation
5. usage of archive/unarchive utilities
- usage of unarchive utility:
read file start-sector byte-length
file is the name of the sequential output file
start-sector is the first sector read form
sector length is computed using the byte length
- usage of archive utility:
write file start-sector
file is the name of the sequential input file
start-sector is the first sector written to
the byte length is determined by the length of the input
file. no input file may be larger than a single disk
- general archive format
o ASCII code set. System using other code sets must convert
the data when reading and writing exchange format disks.
o sequential file organization
o no file may be splited across different archives
- header format
o cpio header ???
o filename has to be constructed on rules based on KERMIT:
- digits and upper case alphabetics (0x30 - 0x39, 0x41 - 0x5a)
- at most a single period
- at most 8 charactes before and 3 characters after the period
- NO device or system specific information (like drives or path names)
- data format
o printable characters (execpt newline) only
o tabs are expanded when writing archives
o newline is represented by a single LF character (as in unix).
newline conversion takes place when reading and writing exchange
format disks under operating systems with different conventions
- storage media
o any media physicaly writable by cug, at least 8", 5.25", 3.5"
diskettes and 9 track tapes