Make base64 encoding/decoding part of rpmio public API

- Base64 is present in headers and all, it's only reasonable that
  our API users have access to this functionality without having
  to link to other libraries. Even if we didn't want to carry the
  implementation forever in our codebase, we should provide a wrapping
  for this (much like the other crypto stuff) for the reason stated above.
- A bigger issue is that our dirty little (badly hidden) secret was using
  non-namespaced function names, clashing with at least beecrypt. And we
  couldn't have made these internal-only symbols even on platforms that
  support it, because they are used all over the place outside rpmio.
  So... rename the b64 functions to rpmLikeNamingStyle and make 'em public.
  No functional changes, just trivial renaming despite touching numerous
  places.

1 files changed, 37 insertions, 0 deletions

diff --git a/rpmio/rpmbase64.h b/rpmio/rpmbase64.h
new file mode 100644
index 000000000..95ee9cd03
--- /dev/null
+++ b/rpmio/rpmbase64.h
@@ -0,0 +1,37 @@
+/* base64 encoder/decoder based on public domain implementation
+ * by Chris Venter */
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* returns malloced base64 encoded string
+ * lines are split with \n characters to be nearest lower multiple of linelen
+ * if linelen/4 == 0 lines are not split
+ * if linelen < 0 default line length (64) is used
+ * the returned string is empty when len == 0
+ * returns NULL on failures
+ */
+char *rpmBase64Encode(const void *data, size_t len, int linelen);
+
+/* decodes from zero terminated base64 encoded string to a newly malloced buffer
+ * ignores whitespace characters in the input string
+ * return values:
+ *  0 - OK
+ *  1 - input is NULL
+ *  2 - invalid length
+ *  3 - invalid characters on input
+ *  4 - malloc failed
+ */
+int rpmBase64Decode(const char *in, void **out, size_t *outlen);
+
+/* counts CRC24 and base64 encodes it in a malloced string
+ * returns NULL on failures
+ */
+char *rpmBase64CRC(const unsigned char *data, size_t len);
+
+#ifdef __cplusplus
+}
+#endif