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(Ruby) Compress Large Binary File in BlocksCompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
require 'chilkat' success = false # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. facSrc = Chilkat::CkFileAccess.new() facDest = Chilkat::CkFileAccess.new() # Open a large binary file for reading. success = facSrc.OpenForRead("qa_data/bmp/big.bmp") if (success == false) print facSrc.lastErrorText() + "\n"; exit end # If we compress in 64K chunks, find out how many blocks there will be. blockSize = 65536 numBlocks = facSrc.GetNumBlocks(blockSize) # Open an output file for the compressed data. success = facDest.OpenForWrite("c:/temp/qa_output/compressedBmp.dat") if (success == false) print facDest.lastErrorText() + "\n"; exit end compress = Chilkat::CkCompression.new() compress.put_Algorithm("deflate") fileBytes = Chilkat::CkByteData.new() compressedBytes = Chilkat::CkByteData.new() # Assuming numBlocks > 1 compress.put_FirstChunk(true) compress.put_LastChunk(false) i = 0 while i < numBlocks success = facSrc.ReadBlock(i,blockSize,fileBytes) success = compress.CompressBytes(fileBytes,compressedBytes) facDest.FileWrite(compressedBytes) i = i + 1 compress.put_FirstChunk(false) if (i == (numBlocks - 1)) compress.put_LastChunk(true) end end facSrc.FileClose() facDest.FileClose() print "Finished compressing file." + "\n"; |
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