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(PHP ActiveX) Decompress Large Binary File in BlocksDecompresses a large binary file in blocks. This example uses BeginDecompressBytes, MoreDecompressBytes, and EndDecompressBytes.
<?php // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.FileAccess') $facSrc = new COM("Chilkat.FileAccess"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.FileAccess') $facDest = new COM("Chilkat.FileAccess"); // Open a previously compressed file for decompressing. // See Compress Large File in Blocks $success = $facSrc->OpenForRead('qa_data/bmp/compressedBmp.dat'); if ($success != 1) { 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 = $facDest->OpenForWrite('qa_output/decompressed.bmp'); if ($success != 1) { print $facDest->LastErrorText . "\n"; exit; } // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Compression') $compress = new COM("Chilkat.Compression"); $compress->Algorithm = 'deflate'; $i = 0; while ($i < $numBlocks) { $compressedBytes = $facSrc->ReadBlock($i,$blockSize); if ($i == 0) { $decompressedBytes = $compress->BeginDecompressBytes($compressedBytes); } else { $decompressedBytes = $compress->MoreDecompressBytes($compressedBytes); } $facDest->FileWrite($decompressedBytes); $i = $i + 1; } // At the very end, flush any remaining decompressed bytes, if any. $decompressedBytes = $compress->EndDecompressBytes(); $facDest->FileWrite($decompressedBytes); $facSrc->FileClose(); $facDest->FileClose(); print 'Finished decompressing file.' . "\n"; ?> |
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