+
+/* Mime constants and macros */
+#define MIME_VERSION "MIME-Version: "
+#define MIME_VERSION_LEN 14
+#define MIME_CONTENT_TYPE "Content-Type: "
+#define MIME_CONTENT_TYPE_LEN 14
+#define MIME_TRANSFER_ENCODING "Content-Transfer-Encoding: "
+#define MIME_TRANSFER_ENCODING_LEN 27
+
+#define MIME_GET_FIELD(header, mime, mime_len, field, field_len, \
+ dest, dest_size) \
+do { \
+ if (dest) { \
+ char *f = strstr(header, field); \
+ if (f) { \
+ f = (char *)mime + (f - header) + field_len; \
+ for (i = 0; i < (mime_len - (f - (char *)mime)); i++) { \
+ if (f[i] == '\r' || f[i] == '\n' || i == dest_size) \
+ break; \
+ dest[i] = f[i]; \
+ } \
+ } \
+ } \
+} while(0)
+
+/* Parses MIME object and MIME header in it. */
+
+bool
+silc_mime_parse(const unsigned char *mime, SilcUInt32 mime_len,
+ char *version, SilcUInt32 version_size,
+ char *content_type, SilcUInt32 content_type_size,
+ char *transfer_encoding, SilcUInt32 transfer_encoding_size,
+ unsigned char **mime_data_ptr, SilcUInt32 *mime_data_len)
+{
+ int i;
+ char header[256];
+
+ memcpy(header, mime, 256 > mime_len ? mime_len : 256);
+ header[sizeof(header) - 1] = '\0';
+
+ /* Check for mandatory Content-Type field */
+ if (!strstr(header, MIME_CONTENT_TYPE))
+ return FALSE;
+
+ /* Get the pointer to the data area in the object */
+ for (i = 0; i < mime_len; i++) {
+ if (mime_len >= i + 4 &&
+ mime[i ] == '\r' && mime[i + 1] == '\n' &&
+ mime[i + 2] == '\r' && mime[i + 3] == '\n')
+ break;
+ }
+ if (i >= mime_len)
+ return FALSE;
+
+ if (mime_data_ptr)
+ *mime_data_ptr = (unsigned char *)mime + i + 4;
+ if (mime_data_len)
+ *mime_data_len = mime_len - ((mime + i + 4) - mime);
+
+ /* Get MIME version, Content-Type and Transfer Encoding fields */
+ MIME_GET_FIELD(header, mime, mime_len,
+ MIME_VERSION, MIME_VERSION_LEN,
+ version, version_size);
+ MIME_GET_FIELD(header, mime, mime_len,
+ MIME_CONTENT_TYPE, MIME_CONTENT_TYPE_LEN,
+ content_type, content_type_size);
+ MIME_GET_FIELD(header, mime, mime_len,
+ MIME_TRANSFER_ENCODING, MIME_TRANSFER_ENCODING_LEN,
+ transfer_encoding, transfer_encoding_size);
+
+ return TRUE;
+}
+
+/* Concatenates the `src' into `dest'. If `src_len' is more than the
+ size of the `dest' (minus NULL at the end) the `src' will be
+ truncated to fit. */
+
+char *silc_strncat(char *dest, SilcUInt32 dest_size,
+ const char *src, SilcUInt32 src_len)
+{
+ int len;
+
+ dest[dest_size - 1] = '\0';
+
+ len = dest_size - 1 - strlen(dest);
+ if (len < src_len) {
+ if (len > 0)
+ strncat(dest, src, len);
+ } else {
+ strncat(dest, src, src_len);
+ }
+
+ return dest;
+}