Info about CompressString(String$) needed

[Dirk Geppert]

Hello,

what kind of compression is CompressString(String$)? Help says: "Compress the specified string and returns a new compressed buffer. "

How can I unpack it again when I send the compressed text to a PB CGI tool?

[Dirk Geppert]

Seems #PB_PackerPlugin_Zip

Code: Select all

; Purebasic Code

UseBriefLZPacker ()
UseJCALG1Packer()
UseLZMAPacker()
UseTARPacker()
UseZipPacker()


Restore Packed

*mem = AllocateMemory(20)
*out = AllocateMemory(26)

For n = *mem To *mem + 19
 
  Read.b b
  PokeB(n, b)
  
Next



DecompressedLength = UncompressMemory(*mem, 20, *out, 26, #PB_PackerPlugin_BriefLZ)
Debug "#PB_PackerPlugin_BriefLZ"
Debug DecompressedLength
Debug PeekS(*out, DecompressedLength, #PB_Ascii)

DecompressedLength = UncompressMemory(*mem, 20, *out, 26, #PB_PackerPlugin_Zip)
Debug "#PB_PackerPlugin_Zip"
Debug DecompressedLength
Debug PeekS(*out, DecompressedLength, #PB_Ascii)

DecompressedLength = UncompressMemory(*mem, 20, *out, 26, #PB_PackerPlugin_Lzma)
Debug "#PB_PackerPlugin_Lzma"
Debug DecompressedLength
Debug PeekS(*out, DecompressedLength, #PB_Ascii)

DecompressedLength = UncompressMemory(*mem, 20, *out, 26, #PB_PackerPlugin_JCALG1)
Debug "#PB_PackerPlugin_JCALG1"
Debug DecompressedLength
Debug PeekS(*out, DecompressedLength, #PB_Ascii)


DataSection
  
  
Packed:
Data.b 120, -100, 115, 116, 114, 70, 3, 46, -82, 110, -18, 30, -98, 94, -34, 0, 92, 34, 6, -16, 0, 0, 0
EndDataSection



CompilerIf  0 

; SpiderBasic Code

String$ = "ABCCCCCCCCCCCCCCCCDEFGHIJK"
*Compressed = CompressString(String$)
Debug "Compressed size (from " + Len(String$) + " bytes): "+MemorySize(*Compressed)


For n = 0 To MemorySize(*Compressed) - 1
  Debug PeekB(*Compressed, n)
Next

CompilerEndIf

[Fred]

Yes, it's zlib compression

[Quin]

Yes, it's zlib compression

Would you consider putting this in the docs by chance? Could be useful info

[idle]

Yes, it's zlib compression

Would you consider putting this in the docs by chance? Could be useful info

It should also specify if that it's deflate or gzip format. Same compressor but different headers