With streams, files of any size can be processed in small chunks-the module uses 64kB chunks. Without a stream, a 64MB file would require at least that much memory for processing, usually more. The “stream” module below can be used to read and write files (or strings) in chunks, reducing the amount of memory required for processing. The streams defined here apply mainly to the filter API described above. When dealing with only small amounts, they are unnecessary. Streams reduce the amount of memory required to process large amounts of data. Out = Out:gsub('%z+$','') - Remove NULs added by AES The message is first encrypted with a shared key using AES, then base64 encoded. The following snippet creates new messages with the same MSH and EVN segments as the original, and packages the entire original message into a new AES segment. For example, suppose you wanted to encrypt the contents of your HL7 messages before sending them out. Since filters return exactly the sort of thing they expect as input (strings or streams), they can be easily chained. With streams, each return a new stream that, when used as described below, will return the filtered result. When used on strings, each function returns its input filtered as a string. – Unix to Unix was added in Iguana 5.0.11.Įach filter can operate on strings or streams. The “s” parameter of each function can be a simple string or a stream as described in a later section. The following table outlines the available filters. These filters are available in the new built-in “filter” module. You can also compress and decompress data in GZip or BZip2 stream formats, or encrypt and decrypt data with AES.įor previous versions of Iguana, we have Lua modules for base64 encoding and hex encoding. You can encode or decode data in base-64 or base-16 (hex), encode/decode URI component text, and encode text for HTML documents. Iguana 5.0.5 and up offers several built-in data filters. This article was written for Iguana 5 so it may contain out of date references.

Newstream filtration