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tcl::transform::crc32 - Crc32 transformation
package require Tcl 8.6 9
package require tcl::transform::core ?1.1?
package require tcl::transform::crc32 ?1.1?
The tcl::transform::crc32 package provides a command creating a channel transformation which passes the read and written bytes through unchanged (like tcl::transform::identity), but additionally continuously computes the crc32 checksums of the data it has seen for each direction and stores them in Tcl variables specified at construction time. The checksum in question is zlib's crc32.
This command creates a crc32 checksumming transformation on top of the channel chan and returns its handle. The accepted options are
The value of the option is the name of a global or namespaced variable, the location where the transformation has to store the crc32 checksum of the data read from the channel.
If not specified, or the empty string, the checksum of the read direction is not saved.
The value of the option is the name of a global or namespaced variable, the location where the transformation has to store the crc32 checksum of the data written to the channel.
If not specified, or the empty string, the checksum of the write direction is not saved.
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Copyright © 2009 Andreas Kupries