A Restrict to Blocks filter groups every N bytes together and sends each group to its sub filters. Each group appears to be a "new file" to the sub filters.

For example, a Restrict to Bytes filter specifies a range that only occurs once in each file e.g. Bytes 1 to 3. By placing the Restrict to Bytes filter inside the Restrict to Blocks filter, the Byte range effectively occurs multiple times -

1. Bytes 1 to 3 of the first group
2. Bytes 1 to 3 of the second group
3. Bytes 1 to 3 of the third group
4. and so on.

If you have a known record length, use this filter to ensure each record is processed as a single unit.

When combined with a Secondary Output Filter as a sub filter (with Append Mode on), records can be selectively written to a new file.

See also

Sub filters
Restriction filters

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