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(PHP ActiveX) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. Note: This example requires Chilkat v11.0.0 or greater.
<?php $success = 0; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $facSrc = new COM("Chilkat.FileAccess"); $facDest = new COM("Chilkat.FileAccess"); // Open a previously compressed file for decompressing. // See Compress Large File in Blocks $success = $facSrc->OpenForRead('c:/temp/qa_output/compressedBmp.dat'); if ($success == 0) { print $facSrc->LastErrorText . "\n"; exit; } // 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 == 0) { print $facDest->LastErrorText . "\n"; exit; } $compress = new COM("Chilkat.Compression"); $compress->Algorithm = 'deflate'; // Assuming numBlocks > 1 $compress->FirstChunk = 1; $compress->LastChunk = 0; $i = 0; while ($i < $numBlocks) { $compressedBytes = $facSrc->ReadBlock($i,$blockSize); $decompressedBytes = $compress->DecompressBytes($compressedBytes); $facDest->FileWrite($decompressedBytes); $i = $i + 1; $compress->FirstChunk = 0; if ($i == ($numBlocks - 1)) { $compress->LastChunk = 1; } } $facSrc->FileClose(); $facDest->FileClose(); print 'Finished decompressing file.' . "\n"; ?> |
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