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(Swift) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
func chilkatTest() { var success: Bool = false // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. let facSrc = CkoFileAccess()! let facDest = CkoFileAccess()! // Open a previously compressed file for decompressing. // See Compress Large File in Blocks success = facSrc.open(forRead: "c:/temp/qa_output/compressedBmp.dat") if success == false { print("\(facSrc.lastErrorText!)") return } // If we compress in 32K chunks, find out how many blocks there will be. var blockSize: Int = 32768 var numBlocks: Int = facSrc.getNumBlocks(blockSize).intValue // Open an output file for the decompressed data. success = facDest.open(forWrite: "c:/temp/qa_output/decompressed.bmp") if success == false { print("\(facDest.lastErrorText!)") return } let compress = CkoCompression()! compress.algorithm = "deflate" var decompressedBytes: NSData var compressedBytes: NSData // Assuming numBlocks > 1 compress.firstChunk = true compress.lastChunk = false var i: Int = 0 while i < numBlocks { compressedBytes = facSrc.readBlock(i, blockSize: blockSize) decompressedBytes = compress.decompressBytes(compressedBytes) facDest.fileWrite(decompressedBytes) i = i + 1 compress.firstChunk = false if i == (numBlocks - 1) { compress.lastChunk = true } } facSrc.fileClose() facDest.fileClose() print("Finished decompressing file.") } |
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