X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/942561da2455ee50a1eb82c8c4f2bdb5e25133d1..cf57870921b26703aad420c6741c524b33736ff1:/h/mhparse.h

diff --git a/h/mhparse.h b/h/mhparse.h
index 08dd77c1..3641f7a6 100644
--- a/h/mhparse.h
+++ b/h/mhparse.h
@@ -87,9 +87,29 @@ struct cefile {
  * At the top level, the c_first_hf list has a list of all message
  * headers.  If the content-type is multipart (c_type == CT_MULTIPART)
  * then c_ctparams will contain a pointer to a struct multipart.
- * A struct multipart contains (among other trhings) a linked list
+ * A struct multipart contains (among other things) a linked list
  * of struct part elements, and THOSE contain a pointer to the sub-part's
  * Content structure.
+ *
+ * An extra note for message/external-body parts.  The enclosing
+ * content structure is marked as a message/external-body; the c_ctparams
+ * contains a pointer to a struct exbody, which contains a pointer to
+ * (among other things) the "real" content (e.g., application/octet-stream).
+ * The "real" content structure has the c_ctexbody pointer back to the
+ * same struct exbody sees in the enclosing content structure (the struct
+ * exbody contains parent pointers if you need to traverse up the content
+ * structure).  Hopefully this makes it clearer:
+ *
+ * Enclosing content:
+ *   Type: message/external-body
+ *   c_ctparams: pointer to "struct exbody"
+ *   c_ctexbody: NULL
+ *
+ * "Real" content:
+ *   Type: application/octet-stream (or whatever)
+ *   c_ctparams: NULL
+ *   c_ctexbody: pointer to "struct exbody"
+ *
  */
 struct Content {
     /* source (read) file */
@@ -427,6 +447,21 @@ int list_switch(CT ct, int toplevel, int realsize, int verbose, int debug,
 char *output_params(size_t initialwidth, PM params, int *offsetout,
 		    int external);
 
+/*
+ * Encode a parameter value using RFC 2231 encode.
+ *
+ * Arguments are:
+ *
+ * pm           - PM containing the parameter value and related info.
+ * output       - Output buffer.
+ * len          - Size, in octets, of output buffer.
+ * valuelen     - Number of characters in the value
+ * valueoff     - Offset into value field (pm->pm_value).
+ * index        - If 0, output character set and language tag.
+ */
+size_t encode_param(PM pm, char *output, size_t len, size_t valuelen,
+                    size_t valueoff, int index);
+
 /*
  * Add a parameter to the parameter linked list.
  *