mime: implement encoders.

curl_mime_encoder() is operational and documented.
curl tool -F option is extended with ";encoder=".
curl tool --libcurl option generates calls to curl_mime_encoder().
New encoder tests 648 & 649.
Test 1404 extended with an encoder specification.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/tool_setopt.c b/src/tool_setopt.c
index b0f319814..635304a8f 100644
--- a/src/tool_setopt.c
+++ b/src/tool_setopt.c
@@ -506,6 +506,14 @@ static CURLcode libcurl_generate_mime(curl_mime *mime, int *mimeno)
         break;
       }
 
+      if(part->encoder) {
+        Curl_safefree(escaped);
+        escaped = c_escape(part->encoder->name, CURL_ZERO_TERMINATED);
+        if(!escaped)
+          return CURLE_OUT_OF_MEMORY;
+        CODE2("curl_mime_encoder(part%d, \"%s\");", *mimeno, escaped);
+      }
+
       if(filename) {
         Curl_safefree(escaped);
         escaped = c_escape(filename, CURL_ZERO_TERMINATED);