gpg: Detect already compressed data also when using a pipe.

* common/iobuf.c (file_filter_ctx_t): Add fields for the peek feature.
(file_filter): Implement peeking.
(iobuf_ioctl): Add new IOBUF_IOCTL_PEEK.
* common/iobuf.h (IOBUF_IOCTL_PEEK, IOBUFCTRL_PEEK): New.
* common/miscellaneous.c (is_file_compressed): Rewrite.  Detect PDF.
* g10/encrypt.c (encrypt_simple): Peek before detecting compression.
(encrypt_crypt): Ditto.
* g10/sign.c (sign_file): Also detect already compressed data.

* g10/options.h (opt): Add explicit_compress_option.
* g10/gpg.c (main): Set opt.explicit_compress_option for -z.

--

Note that this patch also introduces a compression check for signing
which was never done in the past.

GnuPG-bug-id: 6332

1 files changed, 1 insertions, 0 deletions

diff --git a/g10/gpg.c b/g10/gpg.c
index 68c0454ee..de40d3828 100644
--- a/g10/gpg.c
+++ b/g10/gpg.c
@@ -3203,6 +3203,7 @@ main (int argc, char **argv)
 	  case oCompress:
 	    /* this is the -z command line option */
 	    opt.compress_level = opt.bz2_compress_level = pargs.r.ret_int;
+            opt.explicit_compress_option = 1;
 	    break;
 	  case oCompressLevel: opt.compress_level = pargs.r.ret_int; break;
 	  case oBZ2CompressLevel: opt.bz2_compress_level = pargs.r.ret_int; break;