New and Improved CODA Event IO routine

Logo use licensed from Linux Journal

In order add some flexibilty to replay of Hall C data taken with CODA, some enhancements have been made to the Event I/O Library. The changes are incorporated in a new version of evio.c.

evRead can read from standard input by giving evOpen the filename "-".
evRead can read the standard output of a command by giving evOpen the filename "|command".
evRead can read from a compressed file (unix compress or gzip) simply by giving evOpen the name of the compressed file. (gunzip needs to be in the process PATH.)
Will compile and work properly for OSF on the DEC Alpha chip by using the defining the preprocessor symbol BIT64.

Also, while not strictly an change, the Event I/O Library has been verified to function under Linux.

Caveats

With the exception of the changes for 64 bit architectures, the above affect only event reading. No changes have been made that would allow events to be written to standard output or piped to a command. Such changes would, however, not be difficult.

evio.c includes some routines that allow searching for event nubmers that are used with xcefdmp. These routines move forward and backwards within an input file and are thus will not work properly if standard input, a pipe, or compressed file has been opened.

Improved version of evio.c

Last update 19 December 1996

saw@jlab.org