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(C++) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
#include <CkFileAccess.h> #include <CkCompression.h> #include <CkByteData.h> void ChilkatSample(void) { bool success = false; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkFileAccess facSrc; CkFileAccess facDest; // 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) { std::cout << facSrc.lastErrorText() << "\r\n"; return; } // If we compress in 32K chunks, find out how many blocks there will be. int blockSize = 32768; int numBlocks = facSrc.GetNumBlocks(blockSize); // Open an output file for the decompressed data. success = facDest.OpenForWrite("c:/temp/qa_output/decompressed.bmp"); if (success == false) { std::cout << facDest.lastErrorText() << "\r\n"; return; } CkCompression compress; compress.put_Algorithm("deflate"); CkByteData decompressedBytes; CkByteData compressedBytes; // Assuming numBlocks > 1 compress.put_FirstChunk(true); compress.put_LastChunk(false); int i = 0; while (i < numBlocks) { success = facSrc.ReadBlock(i,blockSize,compressedBytes); success = compress.DecompressBytes(compressedBytes,decompressedBytes); facDest.FileWrite(decompressedBytes); i = i + 1; compress.put_FirstChunk(false); if (i == (numBlocks - 1)) { compress.put_LastChunk(true); } } facSrc.FileClose(); facDest.FileClose(); std::cout << "Finished decompressing file." << "\r\n"; } |
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