rpm2cpio: handle LZMA compressed rpms. closes 10166

function                                             old     new   delta
rpm2cpio_main                                         78     120     +42
setup_lzma_on_fd                                       -      29     +29
fork_transformer_and_free                              -      28     +28
...
setup_unzip_on_fd                                     56      32     -24
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/5 up/down: 104/-67)            Total: 37 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 27 insertions, 11 deletions

diff --git a/archival/libarchive/open_transformer.c b/archival/libarchive/open_transformer.c
index ac7e5db95..290dd130f 100644
--- a/archival/libarchive/open_transformer.c
+++ b/archival/libarchive/open_transformer.c
@@ -225,18 +225,8 @@ static transformer_state_t *setup_transformer_on_fd(int fd, int fail_if_not_comp
         return xstate;
 }
 
-/* Used by e.g. rpm which gives us a fd without filename,
- * thus we can't guess the format from filename's extension.
- */
-int FAST_FUNC setup_unzip_on_fd(int fd, int fail_if_not_compressed)
+static void fork_transformer_and_free(transformer_state_t *xstate)
 {
-        transformer_state_t *xstate = setup_transformer_on_fd(fd, fail_if_not_compressed);
-
-        if (!xstate || !xstate->xformer) {
-                free(xstate);
-                return 1;
-        }
-
 # if BB_MMU
         fork_transformer_with_no_sig(xstate->src_fd, xstate->xformer);
 # else
@@ -249,8 +239,34 @@ int FAST_FUNC setup_unzip_on_fd(int fd, int fail_if_not_compressed)
         fork_transformer_with_sig(xstate->src_fd, xstate->xformer, xstate->xformer_prog);
 # endif
         free(xstate);
+}
+
+/* Used by e.g. rpm which gives us a fd without filename,
+ * thus we can't guess the format from filename's extension.
+ */
+int FAST_FUNC setup_unzip_on_fd(int fd, int fail_if_not_compressed)
+{
+        transformer_state_t *xstate = setup_transformer_on_fd(fd, fail_if_not_compressed);
+
+        if (!xstate->xformer) {
+                free(xstate);
+                return 1;
+        }
+
+        fork_transformer_and_free(xstate);
         return 0;
 }
+#if ENABLE_FEATURE_SEAMLESS_LZMA
+/* ...and custom version for LZMA */
+void FAST_FUNC setup_lzma_on_fd(int fd)
+{
+        transformer_state_t *xstate = xzalloc(sizeof(*xstate));
+        xstate->src_fd = fd;
+        xstate->xformer = unpack_lzma_stream;
+        USE_FOR_NOMMU(xstate->xformer_prog = "unlzma";)
+        fork_transformer_and_free(xstate);
+}
+#endif
 
 static transformer_state_t *open_transformer(const char *fname, int fail_if_not_compressed)
 {