Earthworm Module: decompress_UA
Contributed by:
Function
The compress_UA and decompress_UA modules implement the gencompress algorithm which is used with permission from Boulder Real Time Technologies, Inc., copyright 1997.
Details
The compress_UA and decompress_UA modules implement the gencompress algorithm which is used with permission from Boulder Real Time Technologies, Inc., copyright 1997.
compress_UA inputs selected trace data messages (TYPE_TRACEBUF), compresses the samples via the BRTT algorithm, leaves the header intact, and outputs the resulting message as TYPE_TRACE_COMP_UA. Trace messages are selected via SCN names listed in the .d file. Wildcards are allowed. The compressed data output can be tagged with compress_UA's installation_id and module_id (normal Earthworm behavior), or with the installation_id and module_id of the original uncompressed message.
Decompress_UA is the matching decompressor. Its output is identical to the input to the compressor. As with compress_UA, decompress_UA's output can be tagged with its own installation_id and module_id, or with those of the original message. This option allows the logo of the original data source to be preserved thru the compress/decompress operation.
In order to run compress_UA and decompress_UA, you must add TYPE_TRACE_COMP_UA message to 'earthworm.d'.
Example Configuration File
#
# Configuration File for decompress
#
MyModId MOD_DECOMPRESS_UA # This instance of pick_ew
InRing COMP_RING # Transport ring to find compressed data on,
OutRing WAVE_RING # Transport ring to write output to,
HeartBeatInterval 15 # Heartbeat interval, in seconds,
LogFile 1 # 0=write log to stderr/stdout, not to disk
# 1=write a log file to disk
# 2=write a module log but not to stderr/stdout
GetWavesFrom INST_WILDCARD MOD_WILDCARD # only looks for msgtype:TYPE_TRACE_COMP_UA
UseOriginalLogo 0 # 0=use decompress_UA's logo on outgoing TYPE_TRACEBUF msgs
# non-zero=use instid&modid of original compressed msg
# on outgoing TYPE_TRACEBUF msg
