libdpkg: Centralize compressor knowledge into the compress module

Create a new structure to hold the name, extension, and compress and
decompress methods for each compressor. Add new functions to find
the correct compressor by name and extension. This way we have the
information localized in a single place.

1 files changed, 3 insertions, 10 deletions

diff --git a/dpkg-deb/main.c b/dpkg-deb/main.c
index a9bbc956f..37e42a138 100644
--- a/dpkg-deb/main.c
+++ b/dpkg-deb/main.c
@@ -134,7 +134,7 @@ const char printforhelp[]=
      "Type dpkg --help for help about installing and deinstalling packages.");
 
 int debugflag=0, nocheckflag=0, oldformatflag=BUILDOLDPKGFORMAT;
-enum compress_type compress_type = compress_type_gzip;
+struct compressor *compressor = &compressor_gzip;
 int compress_level = -1;
 const struct cmdinfo *cipaction = NULL;
 dofunction *action = NULL;
@@ -209,15 +209,8 @@ static void setaction(const struct cmdinfo *cip, const char *value) {
 }
 
 static void setcompresstype(const struct cmdinfo *cip, const char *value) {
-  if (!strcmp(value, "gzip"))
-    compress_type = compress_type_gzip;
-  else if (!strcmp(value, "bzip2"))
-    compress_type = compress_type_bzip2;
-  else if (!strcmp(value, "lzma"))
-    compress_type = compress_type_lzma;
-  else if (!strcmp(value, "none"))
-    compress_type = compress_type_none;
-  else
+  compressor = compressor_find_by_name(value);
+  if (compressor == NULL)
     ohshit(_("unknown compression type `%s'!"), value);
 }