sent with wrong address..
2011/3/17 Per Øyvind Karlsen <peroyv...@mandriva.org>: > 2011/3/15 Jeff Johnson <n3...@mac.com>: >> I need to revisit the rpmgi pretty soon anyways, because >> hdlists-as-used-by-mandriva >> aren't the same as hdlists-as-used-by-rpm and its almost time to >> fix (Mandriva's not rpm's) divergence. > The format contains some extra padding and information to create an archive > to allow for seeking within it. > > $ perldoc MDV::Packdrakeng: > ... > IMPLEMENTATION > Compressed data are stored by block. For example, > > UncompresseddatA1UncompresseddatA2 UncompresseddatA3UncompresseddatA4 > |--- size 1 ---||--- size 2 ---| |--- size 3 ---||--- size 4 ---| > |<-offset1 |<-offset2 |<-offset3 |<-offset4 > > gives: > > CompresseD1CompresseD2 CompresseD3CompresseD4 > |--- c. size 1, 2 ---| |--- c. size 3, 4 ---| > |<-c. offset 1, 2 |<-c. offset 3, 4 > > A new block is started when its size exceeds the "block_size" value. > > Compressed data are followed by the table of contents (toc), > that is, a simple list of packed files. Each file name is terminated > by the "\n" character: > > dir1 > dir2 > ... > dirN > symlink1 > point_file1 > symlink2 > point_file2 > ... > ... > symlinkN > point_fileN > file1 > file2 > ... > fileN > > The file sizes follows, 4 values are stored for each file: > offset into archive of compressed block, size of compressed block, > offset into block of the file and the file's size. > > Finally the archive contains a 64-byte trailer, about the toc > and the archive itself: > > 'cz[0', strings 4 bytes > number of directory, 4 bytes > number of symlinks, 4 bytes > number of files, 4 bytes > the toc size, 4 bytes > the uncompression command, string of 40 bytes length > '0]cz', string 4 bytes > ... > > -- > Regards, > Per Øyvind > ______________________________________________________________________ RPM Package Manager http://rpm5.org Developer Communication List rpm-devel@rpm5.org
