LZO

LZO is a compression library offering fast compression and very fast 
decompression.

Website: https://www.oberhumer.com/opensource/lzo/
Platforms supported: Win32, Linux, DOS
Headers to include: lzo/lzo.bi
Header version: 2.02

Example
   #include "lzo/lzo1x.bi"

   Dim inbuf As ZString Ptr = @"string to compress (or not, since it's so short)"
   Dim inlen As Integer = Len(*inbuf) + 1
   Dim complen As lzo_uint = 100
   Dim compbuf As ZString Ptr = Allocate(complen)
   Dim decomplen As lzo_uint = 100
   Dim decompbuf As ZString Ptr = Allocate(decomplen)
   Dim workmem As Any Ptr

   Print "initializing LZO: ";
   If lzo_init() = 0 Then
      Print "ok"
   Else
      Print "failed!"
      End 1
   End If

   Print "compressing '" & *inbuf & "': ";

   workmem = Allocate(LZO1X_1_15_MEM_COMPRESS)

   If lzo1x_1_15_compress(inbuf, inlen, compbuf, @complen, workmem) = 0 Then
      Print "ok (" & inlen & " bytes in, " & complen & " bytes compressed)"
   Else
      Print "failed!"
      End 1
   End If

   Deallocate(workmem)

   Print "decompressing: ";

   workmem = Allocate(LZO1X_MEM_DECOMPRESS)

   If lzo1x_decompress(compbuf, complen, decompbuf, @decomplen, NULL) = 0 Then
      Print "ok: '" & *decompbuf & "' (" & complen & " bytes compressed, " & decomplen & " bytes decompressed)"
   Else
      Print "failed!"
      End 1
   End If

   Deallocate(workmem)

