With certain data sets (when compressed record length gets bigger than
uncompressed) myisamchk --unpack may corrupt data file.
Fixed that record length was wrongly restored from compressed table.
myisam/mi_check.c:
With compressed tables compressed record length may be bigger than
pack_reclength, thus we may allocate insufficient memory for record
buffer.
Let single function allocate record buffer, performing needed record
length calculations.
Still, it is not doable with parallel repair, as it allocates needed
record buffers at once. For parellel repair added better record length
calculation.
myisam/mi_open.c:
When calculating record buffer size, take into account that compressed
record length may be bigger than uncompressed.
myisam/mi_packrec.c:
With certain data set share->max_pack_length (compressed record length)
may be bigger than share->base.pack_reclength (packed record length).
set_if_bigger(pack_reclength, max_pack_length) in this case causes
myisamchk --unpack to write extra garbage, whereas pack_reclength
remains the same in new index file. As a result we get unreadable
table.
myisam/myisamchk.c:
With compressed tables compressed record length may be bigger than
pack_reclength, thus we may allocate insufficient memory for record
buffer.
Let single function allocate record buffer, performing needed record
length calculations.
mysql-test/mysql-test-run.pl:
Environment variables to execute myisamchk and myisampack.
mysql-test/r/myisampack.result:
New BitKeeper file ``mysql-test/r/myisampack.result''
mysql-test/t/myisampack.test:
New BitKeeper file ``mysql-test/t/myisampack.test''
