On Wed, Sep 28, 2011 at 8:31 AM, Dmitry Chestnykh <dmi...@codingrobots.com>wrote:
> > The zlib compressor adds a timestamp at the beginning. If you gunzip the > tarballs, you'll find that they are identical. > > > If I read gzip specs correctly, it allows zero timestamp: > > > MTIME (Modification TIME) > > This gives the most recent modification time of the original file being > compressed. The time is in Unix format, i.e., seconds since 00:00:00 GMT, > > Jan. 1, 1970. (Note that this may cause problems for MS-DOS and other > systems that use local rather than Universal time.) If the compressed data > did not come from a file, MTIME is set to the time at which compression > started. MTIME = 0 means no time stamp is available. > > (http://www.gzip.org/zlib/rfc-gzip.html#header-trailer) > > I tried to gunzip such file, and it correctly set today's time, not 1970, > for the unzipped file, when the field is 0. > SHA-1 sums for .tar.gz downloaded at different times then matched. > > So maybe: > > I already checked in a change that sets the timestamp based on the check-in time. But I like your patch better (since it is simpler). > Index: src/gzip.c > =================================================================== > --- src/gzip.c > +++ src/gzip.c > @@ -49,19 +49,17 @@ > /* > ** Begin constructing a gzip file. > */ > void gzip_begin(void){ > char aHdr[10]; > - sqlite3_int64 now; > assert( gzip.eState==0 ); > blob_zero(&gzip.out); > aHdr[0] = 0x1f; > aHdr[1] = 0x8b; > aHdr[2] = 8; > aHdr[3] = 0; > - now = db_int64(0, "SELECT (julianday('now') - 2440587.5)*86400.0"); > - put32(&aHdr[4], now&0xffffffff); > + put32(&aHdr[4], 0); > aHdr[8] = 2; > aHdr[9] = 255; > blob_append(&gzip.out, aHdr, 10); > gzip.iCRC = 0; > gzip.eState = 1; > > -- > Dmitry Chestnykh > > _______________________________________________ > fossil-users mailing list > fossil-users@lists.fossil-scm.org > http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users > -- D. Richard Hipp d...@sqlite.org
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