cgi: more graceful error handling in absence of server

[disorder] / lib / mime.c

diff --git a/lib/mime.c b/lib/mime.c
index 5562c7e5b8976d805cc76c5265335b2e42cf1d6a..7ba42548027baa2304286a48085a7b1230eb0de8 100644 (file)
--- a/lib/mime.c
+++ b/lib/mime.c
@@ -34,6 +34,7 @@
 #include "vector.h"
 #include "hex.h"
 #include "log.h"
+#include "base64.h"
 
 /** @brief Match whitespace characters */
 static int whitespace(int c) {
@@ -72,7 +73,7 @@ static int tspecial(int c) {
   }
 }
 
-/** @brief Mathc RFC2616 seprator characters */
+/** @brief Match RFC2616 seprator characters */
 static int http_separator(int c) {
   switch(c) {
   case '(':
@@ -106,7 +107,9 @@ static int iscrlf(const char *ptr) {
 }
 
 /** @brief Skip whitespace
+ * @param s Pointer into string
  * @param rfc822_comments If true, skip RFC822 nested comments
+ * @return Pointer into string after whitespace
  */
 static const char *skipwhite(const char *s, int rfc822_comments) {
   int c, depth;
@@ -206,8 +209,10 @@ static const char *parsetoken(const char *s, char **valuep,
  * @param s Start of field
  * @param typep Where to store type
  * @param parameternamep Where to store parameter name
- * @param parameternvaluep Wher to store parameter value
+ * @param parametervaluep Wher to store parameter value
  * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-5">RFC 2045 s5</a>.
  */
 int mime_content_type(const char *s,
                      char **typep,
@@ -253,7 +258,12 @@ int mime_content_type(const char *s,
  * @param s Start of message
  * @param callback Called for each header field
  * @param u Passed to callback
- * @return Pointer to decoded body (might be in original string)
+ * @return Pointer to decoded body (might be in original string), or NULL on error
+ *
+ * This does an RFC 822-style parse and honors Content-Transfer-Encoding as
+ * described in <a href="http://tools.ietf.org/html/rfc2045#section-6">RFC 2045
+ * s6</a>.  @p callback is called for each header field encountered, in order,
+ * with ASCII characters in the header name forced to lower case.
  */
 const char *mime_parse(const char *s,
                       int (*callback)(const char *name, const char *value,
@@ -284,12 +294,13 @@ const char *mime_parse(const char *s,
   }
   if(*s) s += 2;
   if(cte) {
-    if(!strcmp(cte, "base64")) return mime_base64(s);
+    if(!strcmp(cte, "base64")) return mime_base64(s, 0);
     if(!strcmp(cte, "quoted-printable")) return mime_qp(s);
   }
   return s;
 }
 
+/** @brief Match the boundary string */
 static int isboundary(const char *ptr, const char *boundary, size_t bl) {
   return (ptr[0] == '-'
          && ptr[1] == '-'
@@ -300,6 +311,7 @@ static int isboundary(const char *ptr, const char *boundary, size_t bl) {
                  && (iscrlf(ptr + bl + 4) || *(ptr + bl + 4) == 0))));
 }
 
+/** @brief Match the final boundary string */
 static int isfinal(const char *ptr, const char *boundary, size_t bl) {
   return (ptr[0] == '-'
          && ptr[1] == '-'
@@ -311,10 +323,14 @@ static int isfinal(const char *ptr, const char *boundary, size_t bl) {
 
 /** @brief Parse a multipart MIME body
  * @param s Start of message
- * @param callback CAllback for each part
+ * @param callback Callback for each part
  * @param boundary Boundary string
  * @param u Passed to callback
  * @return 0 on success, non-0 on error
+ * 
+ * See <a href="http://tools.ietf.org/html/rfc2046#section-5.1">RFC 2046
+ * s5.1</a>.  @p callback is called for each part (not yet decoded in any way)
+ * in succession; you should probably call mime_parse() for each part.
  */
 int mime_multipart(const char *s,
                   int (*callback)(const char *s, void *u),
@@ -346,10 +362,13 @@ int mime_multipart(const char *s,
 
 /** @brief Parse an RFC2388-style content-disposition field
  * @param s Start of field
- * @param typep Where to store type
+ * @param dispositionp Where to store disposition
  * @param parameternamep Where to store parameter name
- * @param parameternvaluep Wher to store parameter value
+ * @param parametervaluep Wher to store parameter value
  * @return 0 on success, non-0 on error
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2388#section-3">RFC 2388 s3</a>
+ * and <a href="http://tools.ietf.org/html/rfc2183">RFC 2183</a>.
  */
 int mime_rfc2388_content_disposition(const char *s,
                                     char **dispositionp,
@@ -388,6 +407,9 @@ int mime_rfc2388_content_disposition(const char *s,
 /** @brief Convert MIME quoted-printable
  * @param s Quoted-printable data
  * @return Decoded data
+ *
+ * See <a href="http://tools.ietf.org/html/rfc2045#section-6.7">RFC 2045
+ * s6.7</a>.
  */
 char *mime_qp(const char *s) {
   struct dynstr d;
@@ -431,41 +453,6 @@ char *mime_qp(const char *s) {
   return d.vec;
 }
 
-/** @brief Convert MIME base64
- * @param s base64 data
- * @return Decoded data
- */
-char *mime_base64(const char *s) {
-  struct dynstr d;
-  const char *t;
-  int b[4], n, c;
-  static const char table[] =
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-  dynstr_init(&d);
-  n = 0;
-  while((c = (unsigned char)*s++)) {
-    if((t = strchr(table, c))) {
-      b[n++] = t - table;
-      if(n == 4) {
-       dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
-       dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
-       dynstr_append(&d, (b[2] << 6) + b[3]);
-       n = 0;
-      }
-    } else if(c == '=') {
-      if(n >= 2) {
-       dynstr_append(&d, (b[0] << 2) + (b[1] >> 4));
-       if(n == 3)
-         dynstr_append(&d, (b[1] << 4) + (b[2] >> 2));
-      }
-      break;
-    }
-  }
-  dynstr_terminate(&d);
-  return d.vec;
-}
-
 /** @brief Parse a RFC2109 Cookie: header
  * @param s Header field value
  * @param cd Where to store result