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POStreaming ZIP file won't open in OSX
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  1. POStreaming ZIP file won't open in OSX
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    copied!<p>I'm creating a class to stream a ZIP file from PHP.</p> <p>The output is absolutely fine when opening in WinRAR, Windows compressed folder, BetterZip etc but when opening in the OSX Unarchiver all I get out is a .cpgz file and nothing else.</p> <p>I've read the ZIP specification over and over again and cross-checked against my headers and everything looks fine. I did find another question on here which seemed to have the same issue but the solution was to change the "version needed to extract" field which I did to 0x0014 and I get an "operation not permitted" error when trying to unzip.</p> <p>I've uploaded a sample zip file with a folder and a small image inside to here:</p> <p><a href="http://www.freefilehosting.net/test_97" rel="nofollow">http://www.freefilehosting.net/test_97</a></p> <p>Here is how the code works:</p> <pre><code>// File entry header echo pack('V', 0x04034b50); echo pack('v', 0x0014); // Version needed to extract echo pack('v', $dir ? 0 : 0x0808); // General purpose bit flag for unknown CRC echo pack('v', 0x00); // Compression method (store) echo pack('V', $dts); // DOS timestamp echo pack('V', 0x00); // CRC - empty echo pack('V', 0x00); // Compressed data length echo pack('V', 0x00); // Decompressed data length echo pack('v', strlen($filename)); // Length of filename echo pack('v', 0x00); // Length of additional data &lt;snip&gt;Output raw file data&lt;/snip&gt; // File entry trailer echo pack('V', 0x08074b50); // Magic echo pack('V', $crc); // CRC generated using crc32b algo echo pack('V', $data_size); // Compressed size echo pack('V', $total_size); // Uncompressed size // CDR record echo pack('V', 0x02014b50); // Magic echo pack('v', 0x0014); // Version created by echo pack('v', 0x0014); // Version req'd to open echo pack('v', 0x00); // General purpose bit echo pack('v', 0x00); // Compression method (store) echo pack('V', $dts); // DOS timestamp echo pack('V', $crc); // CRC of data echo pack('V', $data_size); // Compressed size echo pack('V', $total_size); // Uncompressed size echo pack('v', strlen($filename)); // Filename length echo pack('v', 0x00); // Extra data length echo pack('v', 0x00); // Comment length echo pack('v', 0x00); // Start disk no. echo pack('v', 0x00); // Internal file attributes echo pack('V', $dir ? 16 : 32); // External file attributes echo pack('V', $offset); // Relative offset // End of file record echo pack('V', 0x06054b50); // Magic echo pack('v', 0x00); // Current disk number echo pack('v', 0x00); // Disk containing CDR echo pack('v', $count); // Number of entries in this CDR echo pack('v', $count); // Total number of CDR entries echo pack('V', $cdr_len); // Length of CDR echo pack('V', $cdr_offset); // Offset of CDR echo pack('v', 0x00); // Zip file comment length </code></pre>
 

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