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Bytestream Files

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E0300 Edition 6 ♥
E1098 Edition 5

Bytestream record formats can exist in both the MPE/iX and POSIX namespace. The purpose of this new record format is to provide an emulated file format which exists on character-oriented file systems, where the user application is responsible for defining where logical records begin and end.

To create such a file, use the build parameters: 

  ftp> put <source-file> <target-file>;rec=,,b
The (b) references the bytestream record type. Note that no record size is given. This is because bytestream files always have 1 byte records; any other value would be overwritten. Similarly bytestream files are always MPE file type ASCII as opposed to Binary. Regardless of whether they are MPE file type ASCII or Binary, they may be transferred in either FTP ASCII or Binary transfer mode.

Build

Creates and immediately allocates a new empty file on disk.

The build command has been enhanced to include this bytestream record type.

Syntax 

  BUILD filereference
                                 [F]
    ;REC[[recsize][,[blkfactor][,[U][,BINARY]]]]
                                 [V][,ASCII ]
                                 [B]
The "[B]" is the bytestream record type specification.

Example:

This sample of a bytestream file, a copy from CATALOG.PUB.SYS which is a (80) Byte per Record, Fixed ASCII file, to the bytestream record format which is a (1) Byte per Record Bytestream ASCII file. 

 :copy catalog.pub.sys,asciifix
 :build bytestrm;rec=,,b;disc=2000000
 :fcopy from=asciifix;to=bytestrm ;nouserlabels
 HP31900A.05.02 FILE COPIER (c) HEWLETT-PACKARD CO. 1990

 *200*WARNING: FROMFILE RECSIZE IS 80 BYTES, TOFILE RECSIZE IS 8192
   BYTES.
 CONTINUE OPERATION (Y OR N) ?yes
 EOF FOUND IN FROMFILE AFTER RECORD 13819
 13820 RECORDS PROCESSED *** 0 ERRORS

 :listf ,2
 ACCOUNT= SYS         GROUP=  WORK

 FILENAME CODE  ------------LOGICAL RECORD-----------  ----SPACE----
                  SIZE  TYP        EOF      LIMIT R/B  SECTORS #X MX

 ASCIIFIX          80B  FA       13820      13820  16     4304  1  *
 BYTESTRM           1B  BA     1119420    2000000   1     4608 18  *
NOTE: The BYTESRM file contains 80 (record size) x 13820 (number of records) plus 13820 (the number of line feed (hexadecimal $0A) record terminator characters).



Listing MPE/iX or POSIX Files

Building and Transferring a Bytestream File