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(Go) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
success := false // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. facSrc := FileAccess_Ref.html">chilkat.NewFileAccess() facDest := FileAccess_Ref.html">chilkat.NewFileAccess() // Open a previously compressed file for decompressing. // See Compress Large File in Blocks success = facSrc.OpenForRead("c:/temp/qa_output/compressedBmp.dat") if success == false { fmt.Println(facSrc.LastErrorText()) facSrc.DisposeFileAccess() facDest.DisposeFileAccess() return } // If we compress in 32K chunks, find out how many blocks there will be. blockSize := 32768 numBlocks := facSrc.GetNumBlocks(blockSize) // Open an output file for the decompressed data. success = facDest.OpenForWrite("c:/temp/qa_output/decompressed.bmp") if success == false { fmt.Println(facDest.LastErrorText()) facSrc.DisposeFileAccess() facDest.DisposeFileAccess() return } compress := Compression_Ref.html">chilkat.NewCompression() compress.SetAlgorithm("deflate") var decompressedBytes []byte var compressedBytes []byte // Assuming numBlocks > 1 compress.SetFirstChunk(true) compress.SetLastChunk(false) i := 0 for i < numBlocks { compressedBytes = facSrc.ReadBlock(i,blockSize) decompressedBytes = compress.DecompressBytes(compressedBytes) facDest.FileWrite(decompressedBytes) i = i + 1 compress.SetFirstChunk(false) if i == (numBlocks - 1) { compress.SetLastChunk(true) } } facSrc.FileClose() facDest.FileClose() fmt.Println("Finished decompressing file.") facSrc.DisposeFileAccess() facDest.DisposeFileAccess() compress.DisposeCompression() |
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