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CompressLZWMBS(buf as string) as string

Type Topic Plugin Version macOS Windows Linux iOS Targets
global method Compression MBS Compression Plugin 6.3 ✅ Yes ✅ Yes ✅ Yes ✅ Yes All
Compresses string using LZW algorithm.
Example 
dim s as string
dim b as BinaryStream
dim f as FolderItem
dim l as Integer

f=SpecialFolder.Desktop.Child("output.tiff")
b=f.OpenAsBinaryFile(false)
s=b.Read(b.Length)
b.Close

l=lenb(s)
s=CompressLZWMBS(s)

f=SpecialFolder.Desktop.Child("output.compressed.tiff")
b=f.CreateBinaryFile("text")
b.Write s
b.Close

s=DecompressLZWMBS(s,l)

f=SpecialFolder.Desktop.Child("output.uncompressed.tiff")
b=f.CreateBinaryFile("text")
b.Write s
b.Close

Please remember that the LZW algorithm can be implemented quite different. This one is byte based, uses 12bit offsets and a 4096 entry table.

Returns "" on low memory or Stack Overlow or Output buffer overlow.
(buffer and stack size may be increased on request for future plugin versions)

Some examples using this global method:

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The items on this page are in the following plugins: MBS Compression Plugin.


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