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(Unicode C) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. This example uses BeginDecompressBytes, MoreDecompressBytes, and EndDecompressBytes.
#include <C_CkFileAccessW.h> #include <C_CkCompressionW.h> #include <C_CkByteData.h> void ChilkatSample(void) { HCkFileAccessW facSrc; HCkFileAccessW facDest; BOOL success; int blockSize; int numBlocks; HCkCompressionW compress; HCkByteData decompressedBytes; HCkByteData compressedBytes; int i; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. facSrc = CkFileAccessW_Create(); facDest = CkFileAccessW_Create(); // Open a previously compressed file for decompressing. // See Compress Large File in Blocks success = CkFileAccessW_OpenForRead(facSrc,L"qa_data/bmp/compressedBmp.dat"); if (success != TRUE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(facSrc)); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); return; } // If we compress in 32K chunks, find out how many blocks there will be. blockSize = 32768; numBlocks = CkFileAccessW_GetNumBlocks(facSrc,blockSize); // Open an output file for the decompressed data. success = CkFileAccessW_OpenForWrite(facDest,L"qa_output/decompressed.bmp"); if (success != TRUE) { wprintf(L"%s\n",CkFileAccessW_lastErrorText(facDest)); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); return; } compress = CkCompressionW_Create(); CkCompressionW_putAlgorithm(compress,L"deflate"); decompressedBytes = CkByteData_Create(); compressedBytes = CkByteData_Create(); i = 0; while (i < numBlocks) { success = CkFileAccessW_ReadBlock(facSrc,i,blockSize,compressedBytes); if (i == 0) { success = CkCompressionW_BeginDecompressBytes(compress,compressedBytes,decompressedBytes); } else { success = CkCompressionW_MoreDecompressBytes(compress,compressedBytes,decompressedBytes); } CkFileAccessW_FileWrite(facDest,decompressedBytes); i = i + 1; } // At the very end, flush any remaining decompressed bytes, if any. success = CkCompressionW_EndDecompressBytes(compress,decompressedBytes); CkFileAccessW_FileWrite(facDest,decompressedBytes); CkFileAccessW_FileClose(facSrc); CkFileAccessW_FileClose(facDest); wprintf(L"Finished decompressing file.\n"); CkFileAccessW_Dispose(facSrc); CkFileAccessW_Dispose(facDest); CkCompressionW_Dispose(compress); CkByteData_Dispose(decompressedBytes); CkByteData_Dispose(compressedBytes); } |
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