gzip: gzip -l now outputs accurate size

gzip -l now decompresses to see how long the uncompressed file was.
This fixes what is by far the most common bug report for gzip.
It has a significant performance cost, but it’s worth it nowadays.
* gzip.c (main): -l now sets 'test' too.  All uses of
'test' changed.
(treat_stdin, treat_file): Call do_list after decompressing,
so that the length is known.
(do_list): Omit arg IFD, since it is no longer needed.
All callers changed.  Get the CRC and uncompressed size
from input_crc and bytes_out instead of using lseek.
* tests/list-big: New test.
* unzip.c (unzip): Set unzip_crc before returning.
* util.c (write_buf): If 'test', output nothing.
Update bytes_out with output byte count, regardless of 'test'.
All callers changed.

1 files changed, 1 insertions, 0 deletions

diff --git a/gzip.h b/gzip.h
index db0305f..ebe3213 100644
--- a/gzip.h
+++ b/gzip.h
@@ -262,6 +262,7 @@ extern int zip        (int in, int out);
 extern int file_read  (char *buf,  unsigned size);
 
         /* in unzip.c */
+extern ulg unzip_crc;
 extern int unzip      (int in, int out);
 extern int check_zipfile (int in);