I started to weep when I read this. It's beautiful! Best,
Jerry Daniels Create iPad web apps with Rodeo: http://rodeoapps.com On May 17, 2010, at 7:09 PM, Alejandro Tejada <[email protected]> wrote: > Hi all, > > Who could help me and post this information about > Compress() function in Online Dictionary: > http://docs.runrev.com/Function/compress > > You corrections and additions are welcome! > :-) > > Thanks in advance! > > Alejandro > > ------------------------------------------------------------------------------------------------ > The compress function returns a gzip compressed > string of binary data structured in the following format: > > 1) A 10-byte header, containing: > > A magic number, composed by two bytes: > 1F 8B (Hexadecimal) or 31 139 (ASCII Numbers > of both characters) > > A version number (always 08), that specify compression > compression method used in the file. > In this case Rev write the byte 08. > This single character correspond to DEFLATE compression. > > Additional information like timestamp, optional extra headers, > (as the original file name) are not included and in their place > Rev writes six null bytes: 00 00 00 00 00 00 > > Last char of 10 byte header correspond to the type of > file system on which compression took place. > Rev writes the single byte 03, that correspond to > Unix. > > For example: First Ten characters of a gzipped binary string > (Hexadecimal) > 1F 8B 08 00 00 00 00 00 00 03 > (ASCII Characters numbers) > 31 139 08 00 00 00 00 00 00 03 > > 2- a body, containing DEFLATE-compressed data > > 3- Last 8 characters contains a CRC-32 checksum and > length of the original uncompressed data: > For example: Last 8 characters of gzipped binary string > (Hexadecimal) > 8C 72 E5 F5 1A 34 02 00 > Last four bytes: 1A 34 02 00 = 0002341A = 144,410 > represent the file length (142 k) > Bytes 8C 72 E5 F5 correspond to CRC-32 of > this file: F5E5728C > > If you need to use only the binary string of DEFLATE-compressed > data, without the gzip header and footer, use a script like this: > > put compress(myData) into myGzippedData > put char 11 to -9 of myGzippedData into myDeflateData > > or the short version: > put char 11 to -9 of compress(myData) into myDeflateData > > This binary string of DEFLATE-compressed data is useful > if you need to write a Flate Encoded stream in a PDF file > like this: > > put "xÚ" & char 11 to -9 of myGzippedData into myFlateEncodedStream > _______________________________________________ > use-revolution mailing list > [email protected] > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-revolution _______________________________________________ use-revolution mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
